Home

Advanced Test Equipment Rentals

1. VAPOR FLO REAR RIGHT VIEW Note Your equipment configuration may be slightly different from what is shown Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 40 TENNEY ENVIRONMENTAL 13 3 Vapor Generating Capacity Approximate vapor generating capacity of various models is given in the table below This is a general guide Please remember that the data is approximate Variable factors such Heater Maximum Output _ as line voltage incoming water temperature back pressure and condition of the immersion heater will affect the output 13 4 Humidity Control Power to the electric immersion heater is time proportioned by the controller output This output may be derived directly from a dedicated Humidity Controller or from Channel 2 of a Temperature Humidity Controller PLCs normally use a 4 20 ma control output signal which may be converted to time proportioned control For chambers with a 3 0 KW or less immersion heater and a 240 VAC control circuit the controller output will trigger a triac to conduct and supply power to the heater For chambers with an immersion heater greater than 3 0 KW or a 120 VAC control circuit the controller output will trigger a Watlow Din a mite SCR Power Controller to supply power to the immersion heater The Din a mite incorporates a back to back SCR design with a fixed time base burst firing technique Burst firing provides short bursts of alternating current
2. Universal Model II Cartridge lon Exchanger This unit produces an effluent with a resistivity between 50 000 and 100 000 Ohm cm 20 to 10 Microsiemens cm which is equivalent to an ion concentration level obtainable by single distillation It has a maximum capacity of 1600 grains as CaCOs at a flow of 7 2 gallons per hour Essentially all ionizable constituents are removed with the exception of silica and free carbon dioxide The resin in a newly installed Model Universal II Cartridge consists of white and purple spherical shaped beads Discoloration of the resin will occur from the top down with the resin changing to an amber color Important When discoloration of the cartridge media reaches the line indicated on the cartridge approx 2 from the bottom you must replace the cartridge The amount of time it takes for complete exhaustion of the cartridge depends on your water resistivity and the amount of use Typically the cartridge should last between four and eight weeks However check it weekly Replacement cartridges can be obtained from the TPS Parts Department Cartridge Deionizer Condensate Pump A condensate pump may be used to pump water condensation from the chamber drain port to either a drain located away from the chamber or back to the optional water reservoir The pump will automatically turn on and off in response to an integral float switch A grounded power supply cord is provided with the unit Con
3. 0 Also see Cooling Control Outputs previously described 3SM 04 Event Output No 4 This output must be turned ON to 3SM 05 Event Output No 5 This output must be turned ON to 3SM 06 Event Output No 6 This output must be turned ON to Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 26 TENNEY ENVIRONMENTAL 8 0 TEMPERATURE ALARM amp SHUTDOWN CIRCUIT A comprehensive alarm and shutdown circuit may be provided for multiple protection against chamber overtemperature product over under temperature and Master Contactor 1CON failure The sensors utilized for temperature measurement sensing are normally placed in the plenum in the downstream airflow This is the most responsive area of the chamber Chamber Over Temperature Protection The following devices may be used 1 Heat Limiter HL Temperature Actuated Thermal Cutoff Standard This is an axial leaded one shot protection device that is mounted in a small white ceramic terminal block For chambers with a top temperature limit of 200 degrees C the Heat Limiter is designed to open when the surrounding temperature reaches 240 degrees C For chambers with a lower temperature limit either an alternate thermal cutoff will be used or the Watlow LV Limit Controller will be used 2 Watlow LV Limit Controller 1TS High Heat Cut Out Optional This controller is a
4. 21 0 SEQUENCE OF OPERATION Important Make sure the Installation Instructions have been properly followed before operating the chamber All switches should be in the OFF position before starting the sequence below Important To completely turn off the humidification system you must create a separate step and enter a value of 0 1 minus 0 1 as the humidity setpoint into the VersaTenn III Important You should always shut down the humidity system when pulling down to a very low temperature VersaTenn III Controller Channel 1 Temperature Channel 2 Humidity Note Temperature values are shown in the upper VersaTenn Ill display Relative humidity values are shown in the lower VersaTenn Ill display preceded by RH To display humidity go to SYSTEM with the MODE key and press ENTER Sequence VERSATENN III CONTROLLER 1 Turn on the power source to the chamber Plug in the power supply cord to the chamber when provided Close the main chamber circuit breaker 1CB The Power ON light Normal light and the display of the main controller should be illuminated 2 Load product and close the chamber door securely 3 Enter the desired temperature humidity program or manual setpoints into the main controller Important Check to see if any features or optional equipment must be turned on with an Event Output from the main controller If an Event Output were supplied a Controller Event Output Label with the Event Output
5. The main design features of this refrigeration system include capillary tube type refrigerant control and the use of either a hermetic 1 H P and smaller or semi hermetic 1 5 H P and larger compressor The basic single stage system consists of a compressor an oil separator for units with a compressor 1 5 HP or greater except for models TH27 amp TH65 either an air cooled or water cooled condenser an Evaporator Ambient Coil and a Dehumidify Coil a bypass solenoid to allow for full refrigerant flow and a suction line accumulator to guard against liquid refrigerant return to the compressor Capillary Tube Control Description This system employs capillary tube type refrigerant control A long length of seamless copper tubing with a small internal diameter is used to feed the Evaporator Coil The tube acts as an automatic throttle in controlling refrigerant pressure and flow to the Evaporator Coil With the compressor running a high pressure is maintained on the inlet to the capillary tube and a low pressure is maintained in the Evaporator Coil The pressures will balance when the compressor is turned off This places a low starting load on the compressor motor when turned back on A fine filter or filter drier is provided at each capillary tube inlet to remove moisture and dirt from the refrigerant Temperature Control Without Humidity Two levels of cooling are provided when operating without humidity control One level of cooling
6. Note Your equipment configuration may be slightly different from what is shown VAPOR FLO HUMIDITY GENERATOR Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 12 TENNEY ENVIRONMENTAL 5 6 Vapor Flo Water Supply Quality amp Connection Water Quality Please read and adhere to the important statements below before utilizing your water supply We strongly suggest that you have your water supply tested for resistivity organic content and inorganic content before using the humidifier The water supply to the generator must be demineralized or single distilled and have a resistance measurement between 50 000 and 100 000 Ohm cm 20 to 10 Microsiemens cm It is important that the water is very low in minerals Otherwise the generator s immersion heater housing and float assembly will become encrusted with minerals and cause system failure If your water supply can not meet the resistivity specifications a cartridge ion exchanger deionizer should be obtained from TPS Note lon exchangers are discussed in detail in the Optional Equipment section Do not use double or triple distilled ultra pure water Pure water greater than 1 0 Megohm cm will attack metals such as copper brass etc and will drastically reduce the life of the humidifier Never supply demineralized or single distilled water to a cartridge ion exchanger The result is double distilled water If your water sup
7. Refrig Capillary Tube Type VT3 Page 35 TENNEY ENVIRONMENTAL 12 0 REFRIGERATION SYSTEM SAFETY DEVICES The refrigeration system is provided with several safety devices that stop the compressor s from running if conditions exceed preset limits Hi Lo Pressure Switch 1PS 2PS 1PS is a two pole switch that combines a high pressure cutout switch and a low pressure cutout switch in one package It is normally configured with Open high Close low contact action In a cascade refrigeration system which employs two compressors two Hi Lo Pressure Cutout switches are used The low stage switch would be labeled 1PS and the high stage switch would be labeled 2PS With a low limit condition the HI LO Pressure Cutout Switch 1PS and 2PS for cascade will continue to automatically reset until sufficient pressure develops With a high limit condition you must manually reset 1PS or 2PS If the compressor continues to trip off have the system checked by a qualified refrigeration system mechanic Note The HI LO Pressure Cutout Switch does not apply to compressors rated 1 0 HP The possible causes of a high or low limit cutout are as follows High Pressure Cutout 1PS 2PS Opens if a preset compressor discharge pressure is exceeded Probable cause for high stage cutout is insufficient cooling water water cooled systems or restricted air flow air cooled systems Probable cause for low stage cutout is a malfunction of the high stage sy
8. Purge Dry Air Dehumidification or GN2 Purge options the vent port on the side of the chamber will consist of a 174 1 D checkvalve with no plug mounted vertically on an elbow fitting The checkvalve is screwed onto the elbow fitting and is only hand tightened Whenever running humidity tests only YOU MUST REMOVE the checkvalve by simply unscrewing it When finished reinstall the checkvalve and only hand tighten If the checkvalve is left in place during humidity testing the resulting increase in chamber temperature pressure may not be enough to completely open the checkvalve Unnecessary cycling with the refrigeration system may then occur Reach In Chambers If your chamber includes the Boost Cooling Strato Flo Check Valve 5 8 Air Supply Connection For Optional Equipment Your chamber will require a compressed air supply for the Dry Air Dehumidification Dry Air Purge System option The supply should be clean and dry and range from 80 PSIG min to 100 PSIG max The connection type is 4 FPT Make sure the connection is secure Reference the corresponding Options section in this manual and your chamber specifications for more details Flow Adjustments Ei Twin Tower Adjust the flow adjustment valve at the supply _ Heatless Dryer connection to maintain 100 PSIG max Adjust the flowmeter metering valve to approximately 300 cubic feet per hour Note Your equipment configuration may be slightly different from
9. TEMPGARD IV CONTROL PANEL Press the Mode button to arrive at System and press Enter e Press the Mode button to arrive at CLR ALARM and press Enter Note The alarm buzzer silence switch is standard with the TempGard IV feature only The TGIV configuration is shown in the TempGard IV Alarm Setpoint Entry section SYSTEM RESET Important After an out of limit condition has been corrected the conditioning control circuit must be restarted by pressing the RESET button 1PB A 1 5 second timer 1TC is included in the reset circuit to provide for automatic start when power is applied to the chamber This avoids the need to press the reset button each time the power is cycled Alarm Buzzer amp Silence Switch Optional With this option the silence switch disables the alarm buzzer while corrective action is taken When 1SS is activated the white Silence light will be illuminated If the alarm buzzer was disabled and the system was successfully reset with 1PB the alarm buzzer will now sound to alert the operator to place the silence switch 1SS in it s normal down position Shunt Trip Pole Circuit Breaker 1CB_ Optional In addition to the protection afforded when the Master Contactor 1CON is deenergized the chamber is equipped with a five pole circuit breaker 1CB which incorporates a shunt trip pole This circuit breaker also protects the conditioning control circuitry 1CB is located on the side of the chamber Po
10. When conditions are within the alarm setpoints the upper display of the Watlow 93 will indicate the process temperature normally in degrees Celsius and the lower display will be blank Temperature measurements are made with a 100 ohm platinum RTD sensor Alarm Setpoint Entry Procedure Disregard parameters not listed You will be in the Operation Menu 1 Press the Advance Key key with two curved arrows to scroll to the Alarm Low ALO parameter lower display Use the Up Down arrow keys to set the desired low alarm setpoint upper display 2 Press the Advance Key to scroll to the Alarm High AHI parameter lower display Use the Up Down arrow keys to set the desired high alarm setpoint upper display 3 After setting the low and high limit values continue scrolling with the Advance Key until the Alarm Low setpoint that you just entered appears in the lower display It will go blank after a few seconds Note On the old style Watlow 965 Controller you must press the M key to scroll in any menu Alarm Conditions When an out of limit condition occurs the lower display will flash HI or LO Important When the alarm condition has cleared the TGIV alarm will automatically reset You must then reset the chamber control circuitry by pressing the chamber Reset button Setup Menu The Setup Menu is provided for reference only It has already been configured Do not change any values unless circumstances demand i
11. contacts of 1CON provide power to the temperature control circuitry With the optional alarm buzzer silence switch a NORMAL light is also provided and it will illuminate Note A spare set of 1CON contacts is provided for the customer s closure It is recommended that these contacts wired to terminal blocks 14 amp 15 be used to energize an active heat load if utilized Opened Heat Limiter Thermal Cutoff When a predetermined high temperature limit is reached and the Thermal Cutoff opens Master Contactor 1CON will deenergize and remove power from the conditioning control circuitry The Chamber OVERTEMP light will illuminate and the Chamber Control switch light will extinguish With the optional alarm buzzer silence switch feature both the red Chamber OVERTEMP light and red ALARM light will immediately illuminate the alarm buzzer will sound and the NORMAL light will extinguish When the Thermal Cutoff opens it must be replaced Thermal Cutoff Replacement chamber Open the closest main power disconnect and pull the plug if provided from the outlet When replacing the Thermal Cutoff make sure all power is completely disconnected from the AN Lock Out Tag Out all power to the chamber Thermal Cutoff 1 Loosen the 2 appropriate screws on the side of the white ceramic mounting block as shown in the photo above Use a flat blade screwdriver Pull out Thermal Cutoff with needle nose pliers 2 Bend the leads of a new
12. the electric heaters Control Method 2 This method is used with chambers that have a heat load greater than 3 0 KW or with those that have a 120 VAC control circuit The controller s time proportioned output will energize xSCR xSCR is a Watlow DIN A MITE power controller which incorporates a back to back SCR design with a fixed time base burst firing technique Burst firing provides short bursts of alternating current to the heaters This results in very short temperature swings of the heater elements which greatly extends their life The load current is very smooth and temperature control is precise Electrical noise is practically eliminated by the zero cross switching of the SCRs DIN A MITE power controllers are used in both single phase and three phase two leg designs Note Reference the Electrical or Power Schematic for the type of heater control employed Boost Heat Optional As an option your chamber may be equipped with the boost heat feature which includes extra heaters to provide rapid increases in temperature As the main controller s heat output energizes the main heater bank it will also energize a timer If the timer times out before the controller s heat output turns off the relay will energize the boost heaters through a set of relay contacts Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 30 TENNEY ENVIRONMENTAL 10 0 SINGLE STAGE REFRIGERATION SYSTEM Basic System Description
13. the fan blade or blower wheel and mixes in smoothly with the circulating air stream The system is very responsive but not overpowering as you may have with a steam injection type system An overpressure condition within the belljar can not occur because the vapor port acts like a vent port Another important feature of the Vapor Flo is its ability to increase chamber humidity levels with minimum effect on dry bulb temperature This is important in small chamber designs with limited cooling capacity Vapor generating capacities vary from 0 9 Ibs hr at 300 W 115 V to 9 0 Ibs hr at 3 000 W 220 V depending on the model used Note Your equipment configuration may be slightly different from what is shown in the photo below Vapor Line To Vent Tube Chamber Water Supply Line Float Heater r ad a Zau sg me 7 is ee AE VIEW DURING OPERATION Water Supply The water supply should be 30 40 PSIG maximum The connection is made to either the Utility Connection Panel 1 4 MPT or directly to the Water Pressure Regulator WPR 1 4 MPT The regulator is adjusted at the factory for optimal performance which is normally between 10 and 20 PSIG at the input gauge Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 38 TENNEY ENVIRONMENTAL 13 2 Design Operational Features The bell jar is filled with either demineralized or single distilled water through the water inlet port Water level is accurately
14. to the immersion heater This results in very short temperature swings of the heater element which greatly extends its life The load current is very smooth and temperature control is precise Electrical noise is practically eliminated by the zero cross switching of the SCRs Important Note Always shut down the humidity system when pulling down to a very low chamber temperature 13 5 Humidity Sensor A dry capacitance type humidity sensor is used to measure chamber relative humidity The sensor is mounted in the head of a stainless steel probe that is 8 5 long 0 5 diameter and is protected by a sintered filter The probe is mounted in the downstream air of the conditioning section In response to humidity levels the sensor modifies a signal from the humidity transmitter circuit board This signal is converted by the transmitter to a 0 to 5 Volt DC signal representing 0 to 100 percent relative humidity and is sent to the humidity controller channel The humidity transmitter is powered by a small 15 Volt AC transformer or rE ry HUMIDITY SENSOR HUMIDITY TRANSMITTER Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 41 TENNEY ENVIRONMENTAL 13 6 Optional Equipment with Water Flow Diagram Water Reservoir Humidifier Cartridge Deionizer 1 E y HUMIDITY SYSTEM WATER FLOW DIAGRAM NOTE Optional Cartridge Deionizer Water Reservoir and Condensate Pump Are Shown IMPOR
15. to xx RH in the dry bulb range from 20 to 85 C limited by a dewpoint of 3 C Environmental Conditioning Functions Heating of the chamber is achieved by recirculating chamber air through open air nichrome wire heater elements The elements are supported by ceramic insulators Cooling of the chamber is achieved by recirculating chamber air through refrigerated cooling coils in the chamber conditioning section Non CFC refrigerants are used _Humidification of chamber air is achieved by water vapor injection which is generated by a Vapor Flo Humidity Generator Vapor pressure alone is used for injection Dehumidification is achieved by moisture migration to a refrigerated Dehumidify Coil Air circulation is generated by one or more conditioner motors with propeller type fans Conditioner motors are mounted external to the chamber Temperature Humidity Controller Temperature and humidity conditions are controlled by a two channel VersaTenn III Program Control Logic System The VersaTenn control was developed specifically for environmental test chambers Logic circuits automatically select cooling heating and humidity modes as required with total programming capabilities of temperature and humidity versus time Up to 99 steps may be programmed into 10 individual programs Channel 1 controls temperature using an RTD sensor for temperature measurement Channel 2 controls humidity using a dry capacitance type humid
16. what is shown Flow Adjustment Metering Valve Valve Compressed Air Supply Input Dry Air Purge System Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 15 TENNEY ENVIRONMENTAL 5 9 GN2 Connection For Optional Equipment Your chamber will require a supply of gaseous nitrogen for the GN2 Purge System option The supply may range up to 100 PSIG maximum The connection is type 1 8 NPT Make sure the connection is secure Reference the corresponding Option section in this manual and your chamber specifications for more details 1 Warning Gaseous nitrogen displaces oxygen Make sure the area surrounding the chamber is well ventilated to dilute the gas vented from the chamber vent port Vent Port Checkvalve lt t Chamber checkvalve keee bon GN2 Supply Connection 1 8 NPT Flow Adjustment Metering Valve Adjust the metering valve to maintain approximately 300 cubic feet per hour GN2 Purge System 5 10 LN2 Connection For Optional Equipment Your chamber will require a supply of liquid nitrogen for the LN2 Boost Cooling option The supply may range up to 40 PSIG maximum The connection is type 1 8 NPT Make sure the connection is secure Reference the corresponding Option section in this manual and your chamber specifications for more details Warning Gaseous nitrogen resulting from vaporized LN2 displaces oxygen Make sure the Vent Port area
17. 0 22 0 22 1 22 2 22 3 23 0 24 0 SEQUENCE of OPERATION PREVENTATIVE MAINTENANCE Maintenance Checks Procedures Vapor Flo Humidifier Maintenance amp Troubleshooting Preventative Maintenance Schedule Log SERVICING CASCADE REFRIGERATION SYSTEMS CHAMBER TROUBLESHOOTING GUIDE SUPPLEMENTAL INSTRUCTIONS Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 36 37 38 39 40 41 41 41 42 43 44 45 46 47 48 49 50 51 52 53 53 55 56 57 58 59 62 63 64 Page 3 TENNEY ENVIRONMENTAL 1 0 COMPANY INFORMATION amp ASSISTANCE Congratulations on purchasing a chamber from one of the fine divisions of TPS Thermal Product Solutions You probably already know us as Lunaire Limited We ve changed our name and expanded our vision with the intent to provide you with more diversified solutions to your thermal product process requirements We truly hope that every aspect of chamber design and quality will measure up to your strictest standards Your chamber has been designed to operate with the reliability you expect for the demands you impose on your product and research testing Headquartered in Williamsport Pennsylvania which is located in the North central part of the state TPS includes the following four divisions that manufacture environmental test chambers and industrial ovens Tenney Environmental Lunaire Environmental Grue
18. 0 RH At higher temperature humidity conditions such as 50 deg C and 95 RH turn Event No 3 OFF With these conditions the cold Ambient Coil would sap out the humidity and cause the chamber to cycle COOLING CONTROL CASCADE REFRIGERATION SYSTEM 1SM 06 For chambers with compressors rated below 3 HP this output triggers triac 2TRC to conduct which enables the entire refrigeration system The high stage compressor will start in order to cool the cascade condenser along with either the air cooled condenser or the compressor top mounted cooling fan For chambers with compressors rated 3 HP and above this output energizes contactor x CON through 2TRC which enables the entire refrigeration system The high stage compressor will start in order to cool the cascade condenser along with either the air cooled condenser or the compressor top mounted cooling fan Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 24 1SM 05 1SM 07 1SM 08 1SM 09 1SM 10 SSR1 3SM 03 TENNEY ENVIRONMENTAL For all chambers 1SM 06 also turns ON when a humidity set point has been entered and a need for either cooling or dehumidification is detected For chambers with compressors rated below 3 HP this output triggers triac 3TRC to conduct which energizes the low stage compressor and enables outputs 1SM 07 08 09 For chambers with compressors rated 3 HP and above this output en
19. 1 8 DIN type with a push to set adjustable dial and a four character red LED display The push to set operation reduces accidental limit set point adjustments A red LED on the Watlow LV will illuminate in an alarm condition The controller is installed inside the main control cabinet A Type T thermocouple is used for temperature measurement The high limit setpoint is shown in the LED display and is factory preset 10 15 degrees above the maximum chamber operating temperature This limit should never be changed Note This model replaces the Watlow 147 open board type limit controller The operation is identical Watlow LV Limit Controller Product Over Under Temperature Protection These controllers utilize a 100 ohm Platinum RTD for temperature measurement 1 VersaTenn Ill Controller VST Alarm Output High Low Limits Standard 2 Watlow 93 Controller TempGard IV Feature High Low Limits Optional Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 27 TENNEY ENVIRONMENTAL CIRCUIT OPERATIONS power is only removed from the temperature conditioning control circuitry The instrumentation When Master Contactor 1CON is deenergized due to ANY alarm condition described below and alarm circuitry will still be energized Normal Conditions When the monitored temperature is within the selected setpoints the green NORMAL light 2LT is illuminated and Master Contactor 1CON is energized The
20. 200 C 0 3 C Larger chambers will typically employ a cascade system The exception to this standard range is the Model T6RC which has a low range of 70 C Note Some model numbers are supplied with an additional suffix number e g TxxRC 1 5 This number indicates the Horsepower rating of the compressor s The Benchmaster and the Model T6 series employ 1 0 H P compressors which are hermetically sealed type units Models T10 and larger employ compressors rated from 1 5 to 3 0 H P which are semi hermetic type units Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 8 TENNEY ENVIRONMENTAL Vapor Flo Humidity Generator Humidification of chamber air is accomplished as water is heated and vaporized by an electric immersion heater in a glass bell jar assembly The build up of vapor pressure in the bell jar causes a natural migration of vapor through a copper tube to the chamber conditioning section The vapor mixes smoothly into the circulating air stream Chamber amp Product Over Under Temperature Protection Chamber overtemperature protection is provided with either a thermal cutoff or the optional Watlow LV Limit Controller Product over under temperature protection may be provided with an optional alarm output from the main controller The optional TempGard IV feature with the Watlow 93 Controller may be used for redundant product over under temperature protection These devices are configured
21. 9 GN2 Connection for optional equipment 16 5 10 LN2 Connection for optional equipment 16 5 11 CO2 Connection for optional equipment 17 5 12 Power Connection 18 19 5 13 Application of Power 19 5 14 Operating With an Active Heat Load 19 SYSTEMS and CONTROL 6 0 AIR CIRCULATION SYSTEM 20 7 0 VERSATENN III TEMPERATURE HUMIDITY CONTROLLER 7 1 Controller Features 21 22 7 2 Conditioning Control Functions 23 26 8 0 TEMPERATURE ALARM amp SHUTDOWN CIRCUIT 27 29 9 0 HEATING DESCRIPTION 30 10 0 SINGLE STAGE REFRIGERATION SYSTEM 31 32 11 0 CASCADE REFRIGERATION SYSTEM 33 35 Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 2 12 0 13 0 13 1 13 2 13 3 13 4 13 5 13 6 TENNEY ENVIRONMENTAL REFRIGERATION SYSTEM SAFETY DEVICES HUMIDITY SYSTEM Vapor Flo System Overview Design Operational Features Vapor Generating Capacity Humidity Control Humidity Sensor Optional Equipment and Water Flow Diagram OPTIONAL EQUIPMENT and FEATURES 14 0 15 0 16 0 17 0 18 0 19 0 20 0 DRY AIR DEHUMIDIFICATION DRY AIR PURGE SYSTEM Optional GN2 PURGE AIR SYSTEM Optional LN2 BOOST COOLING SYSTEM Optional CO2 BOOST COOLING SYSTEM Optional TempGard IV ALARM SETPOINT ENTRY Optional LinkTenn32 SOFTWARE Optional CHART RECORDER Optional CHAMBER OPERATION amp MAINTENANCE 21
22. Advanced Test Equipment Rentals A ished 1981 www atecorp com 800 404 ATEC 2832 TENNEY ENVIRONMENTAL F Tenney Environmental Test Chamber OPERATION amp MAINTENANCE MANUAL Model No xxxxx Serial No 3xxxx Chamber Type Temperature Humidity Controller VersaTenn Ill CHAMBER OPTIONS TempGard IV Watlow 93 Watlow LV Limit Controller LN2 Boost Cooling CO2 Boost Cooling Dry Air Dehumid Purge GN2 Purge Data Communications LinkTenn32 Software Chart Recorder a goood TPS Thermal Product Solutions 2121 Reach Road Williamsport PA 17701 570 326 1770 Fax 570 326 7304 Rev 10 24 05 Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 1 TENNEY ENVIRONMENTAL TABLE OF CONTENTS SECTION Page INFORMATION 1 0 COMPANY INFORMATION amp ASSISTANCE 4 2 0 SAFETY WARNINGS amp SYMBOLS 5 6 3 0 PRODUCT SPECIFICATIONS amp OVERVIEW 7 9 4 0 DRAWINGS INFORMATION and VENDOR INSTRUCTION LISTINGS 10 5 0 INSTALLATION INSTRUCTIONS 5 1 Delivery and Uncrating of Unit 11 5 2 Location and Installation of Unit 11 5 3 Chamber Drain Connection 12 5 4 Water Supply Connection For Water cooled Refrigeration Condensers 12 5 5 Vapor Flo Humidity Generator Checks 12 5 6 Vapor Flo Water Supply Quality amp Connection 13 14 5 7 Before Running Humidity Tests Important 15 5 8 Air Supply Connection for optional equipment 15 5
23. L 11 0 CASCADE REFRIGERATION SYSTEM Basic System Description The main design features of this cascade refrigeration system include capillary tube type refrigerant control and the use of hermetic 1 H P and smaller or semi hermetic 1 5 H P and larger compressors This is a multiple refrigeration system consisting of a low stage and a high stage system These systems are integrated to efficiently provide very low temperature levels This is achieved by utilizing a cascade condenser in the low stage where low stage refrigerant is cooled and condensed by high stage refrigerant The cooled low stage refrigerant now has greater cooling capacity in the chamber cooling coil Three different evaporator coils are provided in the chamber conditioning plenum These include a Low Temperature Main Cooling Coil an Ambient Coil for moderate cooling during humidity and a Dehumidify Coil Capillary Tube Control Description This system employs capillary tube type refrigerant control A long length of seamless copper tubing with a small internal diameter is used to feed the evaporator coil The tube acts as an automatic throttle in controlling refrigerant pressure and flow to the evaporator With the compressor running a high pressure is maintained on the inlet to the capillary tube and a low pressure is maintained in the evaporator The pressures will balance when the compressor is turned off This places a low starting load on the compressor motor w
24. R2 This time proportioned output triggers triac 4TRC to conduct which energizes the Vapor Flo Humidity Generator to produce water vapor Important Note To completely turn off the humidification system you must create a separate step and enter a value of 0 1 as the humidity setpoint into the VersaTenn Ill HUMIDITY CONTROL DEHUMIDIFICATION SSR3 This time proportioned output energizes the Dehumidify Coil solenoid valve 4SOL which permits refrigerant to flow to the Dehumidify Coil in the chamber conditioning compartment Output 1SM 06 is energized simultaneously to turn on the entire refrigeration system in a single stage system or just the high stage compressor in a cascade system SSR4 This time proportioned output operates the Optional air dryer system for extended dehumidification To activate SSR4 the VersaTenn internal logic event LEV1 must first be turned ON SSR4 will energize the air dryer through a one minute delay off timer TD SSR4 also energizes the Dry Air solenoid valve ASOL which permits the injection of dry air into the chamber The timer will deenergize the air dryer if output SSR4 remains off for more than one minute EVENT OUTPUTS For Special Applications S N xxxxx ONLY 3SM 01 Event Output No 1 This event must be turned ON to 3SM 02 Event Output No 2 This event must be turned ON to 3SM 03 Event Output No 3 This output must be turned ON to
25. Replace Chamber Dead Doesn t Reset 3 Conditioner Fan Dead Any cause from Problem 1 Do as stated Motor shaft frozen Verify rotate by hand carefully ed ee ee ee serenan OOO OOo ii onamo Ver Cob Tene Senion OO i oermens Verre O OOo i i ee oeo srona Shearer oeaan O ree O O OOO OOO i onamo Ver caterers O i T Open connection between triac amp heater Secure Connection or heater amp neutral OOOO remem roe OOO o COO oo omom ver Conc Temey sove Compressor motor overload protector has Wait 5 minutes if overload does not close tripped replace it Press Switch 1PS 2PS 3PS not closing Verify Contact Tenney Service 8 Compressor hums will not start Low line voltage Get proper electrical service Internal compressor problem Measure winding resistance test for grounds contact Tenney Service Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 63 TENNEY ENVIRONMENTAL TROUBLESHOOTING GUIDE continued PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION 9 Repeated shorting or blowing of Excessive start time voltage too low Correct low line voltage problem start capacitors Compressor starts hums runs Low line voltage Get proper electrical service ES staying on start winding Shorted winding Test resistances test for grounds contact Tenney Service High stage compressor will not Any cause in Problem 1 or 7 Do as stated run n Cascade System e ee
26. TANT This drawing is for reference only Your equipment layout may be different All components may not be employed Condensate Pump Water Reservoir A five gallon water reservoir may be used in place of a fixed water supply line The gravity feed reservoir is mounted either on the top or side of the chamber Water level in the reservoir must be maintained to just below the top hose inlet port when provided When operating with high humidity conditions you may have to fill the reservoir daily We recommend that the optional condensate pump be used with the reservoir to conserve water Two different reservoir models are shown below The inlet port has a compression fitting Water Inlet Port Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 42 TENNEY ENVIRONMENTAL Cartridge lon Exchanger lon exchangers deionizers should be installed in the water supply line to the humidity generator when the resistivity of your water supply is less than 50 000 Ohms cm 20 Microsiemens cm Most city water supplies have a resistivity that ranges from 2 000 to 20 000 Ohms cm 500 to 50 Microsiemens cm The use of water with these resistivity levels would result in encrustation of the generator s immersion heater housing and float assembly and cause system failure Note A prefilter may be necessary to remove an excess of suspended particles Please refer to all water quality warnings in section 5 0
27. Thermal Cutoff as indicated insert into ceramic block and tighten the 2 screws uN You must place needle nose pliers as shown before bending each lead Otherwise you may damage the device Watlow LV Controller High Limit Alarm 1TS Optional When a predetermined high temperature limit is reached and the Watlow LV 1TS contacts open 1CON will deenergize along with the temperature control circuitry The NORMAL light will extinguish both the red Chamber OVERTEMP light 3LT and the red ALARM light 4LT will immediately illuminate and the buzzer if provided will sound 1TS contacts will automatically reset normal configuration when the temperature falls below the cut out limit Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 28 TENNEY ENVIRONMENTAL VersaTenn or optional TempGard IV Alarm When a preset temperature limit is reached within the VersaTenn or the Watlow 93 TempGard IV the corresponding alarm contacts open to deenergize Master Contactor 1CON which removes power from the conditioning control circuitry The NORMAL light is now extinguished the red ALARM light illuminates and the alarm buzzer if provided sounds The red Chamber OVERTEMP light will illuminate when the alarm condition clears and the VersaTenn Alarm Message is cleared as is explained below You must then reset the chamber The TGIV alarm will clear automatically To clear the flashing VersaTenn Alarm Message
28. ambers Refrig Capillary Tube Type VT3 Page 33 TENNEY ENVIRONMENTAL Compressor Cut In Switch 3PS Switch 3PS turns on the low stage compressor only after a preset high stage suction pressure has been reached following start up This feature allows for the cascade condenser to cool before the low stage compressor is started Pressure Switch Thermostat TS A thermostat is mounted on the suction return line near the low stage compressor to monitor the temperature of the return gas flow When the temperature rises above 70 degrees F the thermostat will energize the Artificial Loading solenoid 14SOL which will inject refrigerant into the suction side of the low stage system It will first enter the expansion tank where the added volume permits the charging of additional refrigerant without increasing the standby or charging pressure beyond workable limits Refrigerant gas is then sucked out of the expansion tank and metered through a capillary tube to the suction side of the low stage compressor This action will maintain a positive cool refrigerant flow to the compressor preventing overheating of the compressor and the discharge gas Load Limit Switch 4PS A high pressure cut in sensor monitors the pressure inside the low stage compressor It will activate the Load Limit Switch 4PS when the low stage discharge pressure reaches 280 PSIG This will energize the Artificial Loading solenoid 14SOL which will inject refrigerant int
29. apply to your chamber Changes to some of the set up parameters may drastically affect your chamber performance and void your warranty Contact the TPS Service Dept before attempting any changes Data Communications As an option your chamber may include data communications with the main controller s serial port When employed a Data Communications manual will be included in the Supplemental Instructions Section As a reference the available data types are listed and briefly described below RS232C RS423A Both interfaces are compatible and use 3 wires a single transmit wire a single receive wire and a common line The maximum wire length is 50 feet Only a single chamber may be connected to your computer Data signals are measured as plus and minus 12 Volts to common with RS232C and plus and minus 5 Volts to common with RS423A RS422A This interface uses 5 wires a transmit pair a receive pair and a common line Up to ten chambers may be connected to your computer on a multi drop network up to 4 000 feet long Data signals in each pair are measured as a plus or minus 5 Volt differential EIA 485 This interface uses only 2 wires Both wires are used for transmitting and receiving data and therefore only one device may talk at a time Up to 10 chambers may be connected to your computer on a multi drop network up to 4 000 feet long Data signals are measured as a plus or minus 5 Volt differential An EIA 485 card must be installed for s
30. art 00 02 30 dd hh mm 2 Ramp 235 50 03 45 03 hh mm ss 000000 3 Hold 25 50 02 05 00 hh mm ss 1 Log 1 10 ra o 8 8 a Process Data Graph Alarms Logging Events Profiles Msgs info Ready to download to chamber Add Step Mode Statue Messages Bapsed Time s0 0 05 08 LinkTenn32 Sample Graph Screen 2 Channel 750 C 159 C lt Ch1 Chobert Temp Humidiy Ch 500 0 0 R3232 Connected or LinkTenn32 2 Channel VersaTenn III Screen Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 49 TENNEY ENVIRONMENTAL 20 0 CHART RECORDER Optional As an option your chamber may be provided with either a circular or strip type chart recorder to record temperature and humidity versus time This recorder may be either a one pen or a two pen type which also digitally displays the measured values Typically Channel 1 or Pen 1 records temperature as measured directly with a 100 ohm platinum RTD Channel 2 or Pen 2 records humidity utilizing a processed 0 5 volt dc signal from the VersaTenn III Controller This signal represents 0 100 relative humidity as measured by the humidity sensor The recorder configuration is documented in the Test Report which is located in the Supplemental Instructions Section Reference the recorder s user manual for a detailed operation of the unit Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 50 TENNEY ENVIRONMENTAL
31. ating accuracy and for the proper activation of limit or alarm outputs Please reference the controller user manual for more information Inspection Period 1 Year Optional TempGard IV Alarm Circuit Test If your chamber has the optional TempGard IV perform the following alarm circuit test Test Period 6 Months a High Setpoint Enter a temperature setpoint into the Watlow 93 that is well below the actual workspace temperature The Watlow 93 must transfer to an alarm state and disable the protected circuit s b Low Setpoint Enter a temperature setpoint into the Watlow 93 that is well above the actual workspace temperature The Watlow 93 must transfer to an alarm state and disable the protected circuit s c Test the alarm buzzer making sure it is operable d If customer s contact closure is used to energize an externally powered heat source make sure that the contact closure removes power when TempGard IV is in the alarm state Notes The refrigeration system is permanently sealed and a periodic oil change is NOT required Ifa loss of cooling performance is noted immediately check the condenser for restricted air flow All motors are permanently lubricated therefore greasing or oiling is not required Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 55 TENNEY ENVIRONMENTAL 22 2 Vapor Flo Humidifier Maintenance amp Troubleshooting A N Only qualified service personnel should
32. controlled by a float that is connected to a shut off valve at the water inlet port through an extension arm The water level is kept to a minimum about one inch above the immersion heater This permits the water to be rapidly heated or cooled as power is cycled to the heater There is very little system lag A thick black insulating sleeve covers the length of the bell jar The sleeve is removable for inspection and cleaning purposes An Overflow Line extends upward from the Drain Line to a point above the normal water operating level but below the vapor port This design prevents excess water from draining into the chamber should the float valve fail A Vent Line extends up from the Overflow Line which prevents a vapor lock condition The immersion heater is protected from an overheat condition that could occur from a water supply failure by an automatic reset thermostat TS The thermostat employs a temperature sensing element that is wrapped around the length of the immersion heater TS contacts will open to remove power to the heater when the heater temperature rises above 168 C 334 F The fail safe design of the thermostat also removes power to the heater should the thermostat itself fail Vapor Port Water Inlet Shutoff Valve VAPOR amp WATER PORTS T STAT ELEMENT Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 39 TENNEY ENVIRONMENTAL Water Supply Line amp Shutoff Valve Overflow Line
33. culation fans or blowers can be employed Process air is drawn from along the bottom of the chamber and up into the plenum It flows up through the refrigerated coils and heater elements mixes with injected water vapor and is discharged into the workspace through either a grate at the top of the plenum or through a separate ceiling plenum Ceiling plenums have perforations that disperse the conditioned air downward into the workspace A vent port is provided either near the top of a side wall or in the ceiling RTD Sensor Humidity Sensor Ta ia a Discharge f Airflow l 4 lt lt Shown Without Grate Thermal Cutoff Humidity Injection Port Drain Tube Heaters Dehumidify Coil i Main ewes Cooling Coil Ambient Cooling fay Em peas A ITATTA ANAAO Coil Plenum Conditioning Section Note Your equipment configuration may be slightly different from what is shown Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 20 7 0 WVERSATENN lll TEMPERATURE HUMIDITY CONTROLLER 7 1 Controller Features Temperature and humidity conditions are controlled with the profiling type VersaTenn III Controller The VersaTenn Ill is a microprocessor based proprietary instrument which was developed specifically for environmental test chambers It is precisely designed to take complete command of the chamber s conditioning systems Two channel VersaTenn Controllers incorporate logic circuitry
34. d gauge pressure When the low stage is idle with all components stabilized at 70 deg F it will contain no liquid refrigerant When the system is activated the low stage compressor will pump hot gas through the discharge line to the de superheater on 1HP units only The de superheater air or water cooled removes some heat from the refrigerant gas lightening the heat load on the cascade condenser Leaving the de superheater the gas passes through an oil separator and flows to the cascade condenser Here it is liquefied by heat exchange with high stage refrigerant and flows to the expansion valve Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 59 TENNEY ENVIRONMENTAL Cascade Condenser The cascade condenser is the high stage system s evaporator and low stage system s condenser It can be either tube in tube with the low stage refrigerant in the outside tube or tube in shell with the low stage refrigerant in the shell De Superheater only on 1HP units The de superheater consists of coils as part of the high stage condenser with low stage discharge gas running through them Its purpose is to remove some heat from the low stage discharge gas and thereby lighten the load on the high stage system Evaporator Coil The evaporator coil is part of the low stage system in which the liquid refrigerant boils or evaporates absorbing heat as it changes into a vapor Refrigerant flow to the evaporator i
35. densate Pum Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 43 TENNEY ENVIRONMENTAL 14 0 DRY AIR DEHUMIDIFICATION DRY AIR PURGE SYSTEM Optional A Dry Air System may be employed as an option for either dehumidification or purging applications This system incorporates a heatless desiccant dryer for the generation of a controlled flow of dry air into the chamber 14 1 Dry Air Dehumidification System A Dry Air Dehumidification System may be employed to dehumidify the chamber to dew point levels below those attainable by a refrigeration system which uses a dehumidification coil Operation The Dry Air Dehumidification System is activated by the VersaTenn internal Logic Event LEV1 which must be turned ON This is explained in the VersaTenn manual Event LEV1 will turn on the Dryer Output SSR4 During operation the time proportioned output SSR4 will immediately energize the air dryer through a one minute delay off timer TD The Dry Air solenoid valve ASOL will also be energized which permits the injection of dry air into the chamber The timer will deenergize the air dryer if output SSR4 remains off for more than one minute 14 2 Dry Air Purge System A Dry Air Purge System may be provided to purge the chamber of moisture or undesirable process vapors Operation The Dry Air Purge System is activated by an Event output from the main controller which must be turned ON Reference the Event Label on th
36. e operating or maintaining it TPS shall not be liable for any damages including incidental and or consequential damages regardless of the legal theory asserted including negligence and or strict liability Observe all safety warnings and operating parameters listed in this manual as well as all Caution Danger and Warning signs or labels mounted on the equipment to reduce the risk of equipment damage and personal injury Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 9 TENNEY ENVIRONMENTAL 4 0 DRAWINGS INFORMATION and VENDOR INSTRUCTION LISTINGS The following drawings are provided Electrical Single Phase Systems Electrical Schematic E XXXX 4 Electrical Three Phase Systems Instrumentation amp Control Schematic E Xxxx 4 Power Schematic E XXXX 4 Refrigeration Schematic R Xxxx 4 Note Additional drawings may be provided when various options are employed The following vendor manuals and information are provided VersaTenn III Controller Manual 2 Channel Temp Humidity Humidity Sensor Vaisala Test Report Optional Equipment Vendor manuals will be supplied when the option is included VersaTenn III Data Communications Manual 2 Channel LinkTenn32 Software Watlow 93 Controller Manual TempGard IV Feature Watlow LV Limit Controller Manual Chart Recorder Manual Heatless Dryer Manual with dry air dehumidification or dry air purge option Note Various oth
37. e side of the chamber or your Test Report for the Event Number assigned to this feature When activated the event output will directly energize the dryer and the Dry Air Purge solenoid valve ASOL 14 3 Dry Air Equipment Description The dryer is a twin tower heatless desiccant type that is self regenerating Each desiccant tower chamber contains a compression packed molecular sieve As the compressed air passes through the sieve moisture is picked up by the desiccant The dried air is released through an outlet port and injected into the test chamber s conditioning airflow through solenoid valve ASOL A small portion of the dried air is passed through a sized orifice to the other tower to purge the desiccant of moisture collected during the previous cycle There are four distinct phases of the heatless dryer where the compressed air is alternately cycled and dried in each of the two desiccant towers Integral timers and solenoid valves within the dryer control this operation Note Your equipment configuration may be slightly different from what is shown Dry Air Dehumidification Purge System Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 44 TENNEY ENVIRONMENTAL 15 0 GN2 PURGE AIR SYSTEM Optional Note Refer to the Installation Instructions Section for supply and connection type specifications AN Warning Gaseous nitrogen displaces oxygen Make sure the area surrounding the chamber is well v
38. e supply CO2 has a boiling point of 78 5 degrees Celsius 109 3 deg F As the liquid sprays out of the orifice it immediately vaporizes and absorbs chamber heat while it mixes with process air Operation The system is activated by an event output from the main controller or by a manual switch To use the system the Event must be turned ON Reference the Event Label on the side of the chamber or your Test Report for the Event Number assigned to this feature Once the system is enabled with the event output the controller s time proportioned Full Cooling output will energize a solid state On delay timer If the Full Cooling output remains on longer than ten seconds the timer will time out and energize the CO2 Injection solenoid valve SOL This valve will open to permit the flow of CO2 into the chamber to boost the cooling rate As soon as the Full Cooling output turns off the timer output will open to deenergize SOL and shut off the flow of CO2 Note Your equipment configuration may be slightly different from what is shown CO2 Boost Cooling Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 47 TENNEY ENVIRONMENTAL 18 0 TempGard IV ALARM SETPOINT ENTRY Optional The purpose of this section is to explain how to set your low amp high temperature alarm setpoints with the optional TempGard IV This feature is part of the optional Alarm and Shutdown Circuit described earlier Normal Conditions
39. ed gas to the air or water cooled condenser where the gas cools and condenses to liquid form It is directed through solenoid valve 1SOL to the Ambient Evaporator Coil in the chamber conditioning section Warm chamber circulates through this coil and heat exchange occurs as the liquid refrigerant boils vaporizes and absorbs heat The vaporized refrigerant returns to the compressor through the suction line accumulator SLA The cycle is repeated Refrigerant Flow During Dehumidification When operating with dehumidification control the low stage compressor remains off A Dehumidify Coil is provided as part of the high stage system It is located in chamber conditioning section however slightly away from the main circulating air stream The reason is to minimize sensible heat loss Refrigerant flow is from the compressor as a hot compressed gas to the air or water cooled condenser where the gas cools and condenses to liquid form It is directed through solenoid valve 4SOL to the Dehumidify Coil Water vapor condenses on this coil due to the reaction of warm moist chamber air coming in contact with a cold coil surface Heat exchange occurs as the refrigerant boils and vaporizes It then returns to the compressor through the suction line accumulator SLA The cycle is repeated For more detailed information on a cascade system please reference the section entitled Servicing Cascade Refrigeration Systems Reach In Temp Humidity Test Chambers
40. editor Logging printing and graphing of process data Exporting of logging history data via an ASCII comma separated values CSV file for easy import into Microsoft Excel or any analysis package that accepts comma separated values CSV file format Go to website www tidaleng com for more information on LinkTenn32 Software o o The minimum hardware requirements for LinkTenn32 are as follows One of these Microsoft Windows PC Operating Systems Windows 95 98 98 Special Edition NT 4 0 Service Pack 6a 2000 Service Pack 2 A Pentium Processor 233 MHz or better 128 MB Ram plus 32 MB for each simultaneous chamber session 40 MB hard disk space One serial port One National Instruments GPIB IEEE Interface Optional One 10 100 Ethernet card using TCP IP Optional Printer Optional Fax Modem Optional fete Oe OO Example Screens ee Environmental cix Bile Pots Alert System Window Help n D Close New Open Save SaveAs Extents Edit lt VERSATENN 3 TEST CHAMBER op cox E os 3x ON 7 g FF y it Q OFF 2 Status Hold Mode Chan 1 Temp C Chan 2 Humd RH Set P Set 9 S Point DAS sme Point 900 mme Actual 59 C Sito Actual 0 0 Heat Cool Humidi DeHumidi 100 0 100 0 Profile Graph EEEE ES 770 0 1155 0 1540 0 m StepNum Step Type ChiC N A Time Jump To Jump Count Events Waitfor Event T St
41. eee a Freie na atone Cone Torey Sena es ee sasesana 13 Low stage compressor runs but Low stage is low on refrigerant Have system leak tested little or no cooling Full main solenoid valve 8SOL failing to Replace open Artificial Loading solenoid valve 14SOL Replace stuck open full time Main cooling coil badly frosted Main cooling coil badly frosted coil badly frosted Raise temperature to defrost 14 Compressors run but cool Restricted ventilation dirty condenser fins Move unit away from wall clean condenser inefficiently fins 15 Refrigeration works long or Excessive heat load Reduce load if possible continuously Low Co charge Have charge checked by refrig mechanic charges are on ID label 16 Compressor repeatedly trips out Pressure switch failure Have refrigeration mechanic check overload protector switches Contact Tenney Service 17 Noisy Compressors Compressor loose on mounts Compressor loose on mounts on mounts Tighten hold down nuts 18 Noisy compressors even with Broken springs within compressor housing Replace compressor Call Tenney Service secure hold downs NOTE At site ambient temperature if the chamber does not pull down substantially in temperature within 15 minutes something is wrong Turn the chamber off Let it normalize and defrost Then try it again If it still does not pull down to low temperature shut it off and get technical help A refrigeration system that does not cool proper
42. entilated to dilute the gas vented from the chamber vent port checkvalve General Description As an option your chamber may be equipped with a GN2 Purge System to provide an inert atmosphere inside the chamber An inert atmosphere minimizes the buildup of moisture and prevents condensation on the product under test Eliminating oxygen in the chamber air helps prevent corrosion of the product Gaseous nitrogen is injected into the chamber through a header pipe in the conditioning plenum It readily mixes in with the circulating process air Operation The system is activated by an event output from the main controller or by a manual switch To use the system the Event must be turned ON Reference the Event Label on the side of the chamber or your Test Report for the Event Number assigned to this feature When activated the event output will energize and open the GNSOL solenoid valve to permit the injection of GN2 A metering valve and flowmeter is supplied as part of the system to establish the design purge flow The valve should be adjusted until the indicated flow is about 300 cubic feet per hour Note Your equipment configuration may be slightly different from what is shown GN2 Purge System Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 45 TENNEY ENVIRONMENTAL 16 0 LN2 BOOST COOLING SYSTEM Optional Note Refer to the Installation Instructions Section for supply and connection type speci
43. er temperature will rise The internal logic of the controller will automatically turn on the refrigeration system to maintain a set temperature Although a cooling system failure is not likely to occur it is always a possibility when mechanical systems are used In the event of a cooling system failure that results in an out of limit over temperature condition one or more of the system safeties will remove power from the system However heating will continue if power remains applied to the active load To guard against this continued heating the product should be powered through the spare contact of the Master Contactor 1CON when provided which is described in the Alarm and Shutdown Circuit section Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 19 6 0 AIR CIRCULATION SYSTEM Tenney Environmental Test Chambers are provided with an efficient airflow management system that maintains maximum temperature uniformity Chamber air is conditioned in the conditioning plenum where the fans heater elements refrigeration coil and humidity injection port are located The plenum is isolated from the workspace Airflow Description The plenum is installed in the rear wall Airflow is generated by either propeller type fans or blower wheels which are mounted near the top of the plenum Fans and blower wheels are directly driven by externally mounted motors Due to the size of reach in chambers a maximum number of two cir
44. er vendor product information sheets manuals are also provided that contain important operation and maintenance instructions Their inclusion is subject to vendor availability Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 10 TENNEY ENVIRONMENTAL 5 0 INSTALLATION INSTRUCTIONS Read this section completely before attempting to install or operate the equipment 5 1 Delivery and Uncrating of Unit Inspect equipment and shipping crate immediately upon receipt If any damage is apparent you should discuss it with the trucking delivery person and contact the transportation company immediately Make notes of any damage on the Bill Of Lading Retain all shipping materials for inspection Any claims for damage must start at the receiving point Check packing slip carefully and make sure all materials have been received as indicated on the packing ticket Unless otherwise noted YOUR ORDER HAS BEEN SHIPPED COMPLETE Chambers and any remote machinery skids or control cabinets should be handled and transported in an upright position They must never be carried on their back front or any side For all models except Model BTRS BTRC T6RS and T6RC A N To safely secure the refrigeration system compressors and piping during shipping wooden blocks have been installed underneath the compressors These blocks must be removed before operation Serious damage may result if not removed On compressors with rubber m
45. ergizes contactor xCON which energizes the low stage compressor and enables outputs 1SM 08 amp 09 For all chambers 1SM 05 is disabled when a humidity control set point is entered since only the high stage compressor is used when cooling is required with humidity This is a time proportioned output that energizes the Full Main Coil solenoid valve 8SOL permitting maximum refrigerant flow to the Low Temperature Evaporator Coil 8SOL bypasses the capillary device that restricts flow to the cooling coil This output functions only after being armed by output 1SM 08 This output will turn on when the chamber setpoint is below 20 C allowing full cooling to be modulated by output 1SM 07 When this output is off only reduced cooling is available resulting in finer control at higher temperatures This is a time proportioned output that is the compliment of output 1SM 07 i e it is off when 1SM 07 is on and vice versa It energizes the Artificial Loading bypass solenoid valve 14SOL to inject cool liquid refrigerant into the suction side of the compressor This occurs with reduced cooling requirements to prevent overheating of the compressor For units with compressors 1 5 H P and larger this output energizes the Cascade Condenser solenoid valve 9SOL allowing liquid refrigerant flow to the Cascade Condenser With humidity control SSR1 turns on to provide time proportioned moderate cooling Output 1SM 06 is simultaneously turned on to ene
46. evel which should be just below the top inlet port The Viton seal may need replaced if the water level is too far above this level Measure the immersion heater s resistance Unusually high resistance would indicate lack of heating power With the Vapor Flo unit operating measure voltage at the immersion heater terminals The voltage should be no lower than 10 below nominal Chief cause of low immersion heater voltage is an inadequate power cord Immersion Heater Resistance The Heater Resistance Table is provided to identify shorted HEATER RESISTANCE or open elements and to identify heater size Resistance ADMINKIEREE GENCE values are those at 75 degrees Fahrenheit and may vary Heater NOMINAL RESISTANCE by 15 or more without falling out of tolerance Heater terminals can be accessed in the electrical box on the rear a ge important The Vapor Flo Generator should be drained before checking heater resistance This prevents erroneous readings that may occur from a shorted element Spare Parts Complete spare parts are available from the TPS Service Department When you order please specify the model and serial number of the equipment served by your Vapor Flo Humidity Generator Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 57 TENNEY ENVIRONMENTAL 22 3 Preventative Maintenance Schedule Log Important For each of the items to be inspected refer to item description sections for deta
47. ever be permitted to perform any service related procedure on this chamber Maintenance Pull back the bell jar insulation and inspect the float heater and jar When they appear encrusted with salts and scale clean the assembly described below Inspection Period Every 2 weeks Drain the bell jar assembly completely to remove any concentrated impurities This is achieved by opening the drain valve at the rear of the Vapo Flo Inspection Period Every 2 to 4 weeks Cleaning Disconnect all power from the chamber Shut off the water supply Drain the bell jar Remove the bell jar as described below and gently wipe the inside of the glass with a mild cleaner Carefully clean any water deposits from the heater assembly Rinse the glass thoroughly and replace as described below Removing the Bell Jar Remove the Armaflex insulating sleeve by sliding it over the end of the bell jar Spin off the four wing nuts top one last Slip off the outer ring flange and then remove the glass jar The immersion heater thermostat element float and float valve are now exposed Usually the bell jar flange will adhere to the humidifier bracket LOOSEN IT GENTLY Prying with a screwdriver may chip or break the glass Reassembling the Bell Jar When reassembling smear a thin coat of silicone grease on the bell jar s ground flange to prevent its sticking to the gasket Tighten the four wing nuts finger tight only Do not use pliers Trouble Shootin
48. ference the Event Label on the side of the chamber or your Test Report for the Event Number assigned to this feature Once the system is enabled with the event output the controller s time proportioned Full Cooling output will energize a solid state On delay timer If the Full Cooling output remains on longer than ten seconds the timer will time out and energize the LN2 Injection solenoid valve SOL This valve will open to permit the flow of LN2 into the chamber to boost the cooling rate As soon as the Full Cooling output turns off the timer output will open to deenergize SOL and shut off the flow of LN2 Note Your equipment configuration may be slightly different from what is shown LN2 Boost Cooling Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 46 TENNEY ENVIRONMENTAL 17 0 CO2 BOOST COOLING SYSTEM Optional Note Refer to the Installation Instructions Section for supply and connection type specifications AN Warning Carbon Dioxide gas displaces oxygen Make sure the area surrounding the chamber is well ventilated to dilute the gas vented from the chamber vent port checkvalve General Description The CO2 Boost Cooling System option may be provided to increase the rate of cooling beyond the means of the refrigeration system Boost cooling is achieved by injecting liquid carbon dioxide into the chamber through an orifice within an injection port There is no flow adjustment valve for th
49. fications surrounding the chamber is well ventilated to dilute the gas vented from the chamber vent port i Warning Gaseous nitrogen resulting from vaporized LN2 displaces oxygen Make sure the area checkvalve General Description The LN2 Boost Cooling System option may be provided to increase the rate or limit of cooling beyond the means of the refrigeration system Boost cooling is achieved by injecting liquid nitrogen into the chamber through a header pipe in the conditioning section LN2 has a boiling point of 196 degrees Celsius 320 deg F As the liquid sprays out of the header pipe it vaporizes and absorbs chamber heat while it mixes with process air LN2 systems are provided with a manually set flow adjustment valve which permits the adjustment of nitrogen flow to avoid incomplete evaporation at varying LN2 supply pressures As the chamber cools to the extreme cold temperature limit complete evaporation of liquid nitrogen may not occur if the supply pressure is allowed to drop promote puddling If enough liquid accumulates it may seep towards the chamber door gasket Do not allow LN2 to contact the door gasket Exposure to LN2 will damage the gasket and violate the seal i Important Incomplete evaporation will cause droplets of liquid to fall to the floor and may Operation The system is activated by an event output from the main controller or by a manual switch To use the system the Event must be turned ON Re
50. flow to the compressor preventing overheating of the compressor and the discharge gas Expansion Tank An expansion tank is provided to add volume to the low stage Added volume permits the charging of additional refrigerant without increasing the standby or charging pressure beyond workable limits Refrigerant gas is sucked out of the expansion tank during system operation It is metered through a capillary tube regulating the rate of gas entry into the system Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 60 TENNEY ENVIRONMENTAL Frosted Lines Are Typical A low stage characteristic is frosted liquid and suction lines In a normal cascade system the liquid line is always below 32 deg F The suction line returning from a 100 deg F evaporator assuming 15 degree superheat will also be far below freezing Leak Testing Loss of refrigerant is the most common cause of refrigeration failure Because of temperature extremes experienced by its metal parts the cascade system is particularly susceptible to leaks Check the entire system with an electronic leak detector If the system is empty or at low pressure boost pressure to 200 PSIG with inert gas not oxygen diluted with a percentage of high stage refrigerant Test again A leak check while the system is at low temperature 80 deg F or colder is a necessity Expansion valve flanges superheat adjustment caps and other mechanical joints shou
51. following preventive maintenance steps are suggested 22 1 Maintenance Checks Procedures A All interlocks and safety features should be tested periodically for proper operation Door Gaskets Inspect the door gaskets for wear cracks tears etc Replace gasket if significant wear is evident Inspection Period 30 Days Door Sealing Quality Check that the door seals evenly around its perimeter to negate thermal loss Adjust door latch if necessary Inspection Period 30 Days Air Cooled Condenser Coil Fan A Remove All Power From Chamber Inspect the condenser coil for dust or dirt accumulation that would impede the flow of air A dirty condenser will decrease system efficiency and drive up compressor head pressure causing it to trip out If necessary clean with a brush or vacuum cleaner Frequency of cleaning depends upon the air quality at the chamber The condenser fan should also be checked for cleanliness Make sure the fan spins freely Inspection Period 30 Days Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 53 TENNEY ENVIRONMENTAL Water Cooled Refrigeration System Supply Drain For water cooled refrigeration systems make sure the condenser water supply is according to the specifications listed on the Refrigeration Drawing If a closed loop water supply system is not utilized and the water out port connection is to an open drain make sure that flow to the open drain is not res
52. g Generator will not deliver vapor Make sure the water level in the bell jar is approximately 1 above the immersion heater Measure voltage on immersion heater Heater terminals can be accessed in the electrical box on the rear of the Vapor Flo Immersion heater cycles on and off This is usually an indication of low water level Be sure water supply is adequate Clean the water inlet valve and washer of contamination Flush and clean the bell jar Finally adjust the float so that water level is about 1 above the immersion heater You may have to bend the float arm slightly Careful Do not damage the float If the element still cycles replace the thermostat assembly Wind the sensing element on the immersion heater approximately as the original was wound Water continually runs or dribbles from over flow The float valve is leaking Shut off water Remove the bell jar insulating sleeve and bell jar Remove and disassemble the float valve Shake the float If it is water logged replace it Clean the valve and reassemble If the valve still leaks after cleaning replace the Viton seal Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 56 TENNEY ENVIRONMENTAL Humidifier operates but vapor volume is low Examine the humidity feed line and remove any obstruction Thoroughly clean the immersion heater Be sure the water level is approximately 1 above the immersion heater Check the optional reservoir water l
53. hambers Refrig Capillary Tube Type VT3 Page 11 TENNEY ENVIRONMENTAL 5 3 Chamber Drain Connection A chamber drain connection is provided for the removal of workspace condensate The drain port is normally located at the rear of the chamber The connection is Type 2 FPT Check your General Layout Drawing when provided for further details 5 4 Water Supply Connection Water cooled Refrigeration Condensers Only For chambers with a water cooled refrigeration condenser the water supply must be capable of providing a differential of 40 PSIG minimum between the inlet and outlet connections to the chamber Connect the supply to the Water In connection Connect the Water Out connection to an open drain or to the return of a tower supply Make sure both connections are secure Reference the Refrigeration Schematic or the General Layout Drawing when provided for further details 5 5 Vapor Flo Humidity Generator Checks The humidity generator is installed inside the machinery section and consists mainly of a glass bell jar assembly A thick black insulating cover is wrapped around the bell jar Remove the cover by sliding it off Make sure the gasket sealing the bell jar is positioned properly around its perimeter and that the wingnuts securing the bell jar are tight Do not replace the cover until you follow all of the instructions that follow Overflow Vent Tube Gasket Note Bell jar is shown with water drained Water Level
54. he top hose inlet port when provided Water is fed by gravity to the humidifier When operating with high humidity conditions you may have to fill the reservoir daily Condensate Pump The optional condensate pump may be used to reduce the frequency of refilling the reservoir or to conserve water Water is pumped back to the reservoir in response to an integral float switch Important Refer to the Humidity System Section in this manual when a water reservoir a condensate pump or a cartridge ion exchanger is used Water Supply Regulator After turning on the water supply and adjusting the pressure make sure the water level in the belljar is approximately 1 above the immersion heater Replace the insulating cover Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 14 TENNEY ENVIRONMENTAL 5 7 Before Running Humidity Tests Important Reach In Chambers Before running humidity tests you must remove the humidity vent port plug from the side of the chamber which normally consists of a 1 to 4 diameter rubber stopper A N If the vent plug is not removed the heated vapor from the humidity generator will increase chamber temperature and may cause unnecessary cycling with the refrigeration system Exception Your chamber will not include a standard humidity vent port if the chamber employs the Boost Cooling Dry Air Dehumidification Dry Air Purge or GN2 Purge options See Warning below Dry Air
55. hen turned back on A fine filter or filter drier is provided at each capillary tube inlet to remove moisture and dirt from the refrigerant LOW STAGE DESCRIPTION The low stage system is only used when operating without humidity control It includes a compressor an oil separator for units with a compressor 1 5 HP or greater the cascade condenser an expansion tank and the Low Temperature Evaporator Coil located in the chamber conditioning section Two levels of cooling are provided One level of cooling utilizes a second capillary tube in series with a primary one This restricts the flow of refrigerant to the evaporator coil allowing very fine moderate temperature control When full cooling is required the Full Main Coil solenoid 8SOL is energized which allows refrigerant flow to bypass the second capillary tube Refrigerant flow in the low stage is from the compressor as a hot compressed gas through the oil separator and then to the cascade condenser Here low stage refrigerant is cooled by the high stage refrigerant It condenses to liquid form and flows through the various capillary tubes to the evaporator coil in the chamber conditioning section Warm chamber air circulates through the cooling coil and heat exchange occurs as the liquid refrigerant boils vaporizes and absorbs heat The vaporized refrigerant returns to the compressor through the suction line accumulator SLA The cycle is repeated Reach In Temp Humidity Test Ch
56. ignal conversion IEEE 488 This is a parallel multi drop interface with several control and data lines Each device connected must be set to a unique address Data from other test devices may also be collected An IEEE 488 to serial converter card must be installed Maximum cable length is approx 33 ft DATA COMMUNICATION PORTS Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 22 TENNEY ENVIRONMENTAL 7 2 Conditioning Control Functions Temperature control related functions are affected by solid state outputs on remote switching module 1SM and are designated 1SM 01 thru 1SM 10 Humidity with temperature control related functions are effected by solid state relay outputs mounted on the VersaTenn Ill and are designated SSR1 thru SSR5 Event outputs user entered that can alter the standard VersaTenn logic for special or optional applications are solid state devices mounted on remote switching module 3SM 3SM has six outputs designated 3SM 01 thru 3SM 06 Event outputs that operate a standard optional feature are normally described in the Options section The System ON button must be pressed to start control of the chamber The following descriptions detail the functions of the various outputs Event outputs user entered are provided mainly for special applications AIR CIRCULATION 1SM 01 This output immediately turns on the conditioner fan motor when the VersaTenn System ON button
57. ils on maintenance and service PREVENTATIVE MAINTENANCE SCHEDULE LOG ITEM TO BE Inspection Period Actual Date Actual Date Actual Date Actual Date INSPECTED Inspected Inspected Inspected Inspected Serviced Serviced Serviced Serviced Water cooled 30 Days Condenser Water Supply Drain Conditioner Fan 6 Months Evaporator Cooling Coil 6 Months General Electrical 6 Months Connections Electric Heaters 6 Months Electrical Supply 6 Months Voltage Main Temperature Controller Calibration TempGard IV Alarm 6 Months Drain Vapor Flo Bell Jar 2 to 4 Weeks Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 58 TENNEY ENVIRONMENTAL 23 0 SERVICING CASCADE REFRIGERATION SYSTEMS INTRODUCTION Note Only qualified service personnel should ever be permitted to perform any service related procedure on this chamber This information is written to help the refrigeration serviceman trouble shoot and repair low temperature cascade systems It is assumed that the reader is familiar with standard refrigeration practice and is interested in the special techniques applicable to cascade systems Important Please remember that the following description may differ in some respects to the refrigeration system equipped with your particular chamber History Prior to the development of low boiling point refrigerants such as R13 114 deg F and R503 127 deg F reaching ultra low tem
58. in a comprehensive alarm and shutdown circuit Additional Options Your Tenney chamber may include many other options such as boost heating boost cooling using LN2 or CO2 a dry air system for dehumidification a purge air system using compressed air or GN2 a chart recorder and LinkTenn32 software LinkTenn32 is an enhanced software program that provides centralized remote monitoring and the control of multiple process controllers chambers simultaneously As you can see Tenney Environmental Test Chambers are diversified tools designed to encompass a wide range of operating conditions and functions If you come upon any questions as you continue on through the manual please contact our Service Department Operating Parameters and Requirements This equipment is designed to operate safely when the following environmental conditions are met Indoor use only Within a temperature range of 5 C to 30 C max Maximum relative humidity 90 The listed chamber specifications are based on operation at 24 C ambient temperature altitude at sea level and a 60 Hz power supply Chamber operation utilizing a 50 HZ power supply may derate the listed performance specifications Equipment damage personal injury or death may result if this equipment is operated or maintained by untrained personnel Operators and service personnel must be familiar with the location and function of all controls and the inherent dangers of the equipment befor
59. is pressed HEAT CONTROL 1SM 03 Control Method 1 This method is used with chambers that have a 3 0 KW or less heat load and a 240 VAC control circuit The time proportioned 1SM 03 output will trigger triac 1TRC to conduct and energize the electric heaters Control Method 2 This method is used with chambers that have a heat load greater than 3 0 KW or with those that have a 120 VAC control circuit The time proportioned 1SM 03 output will energize xSCR xSCR is a Watlow DIN A MITE power controller which incorporates a burst firing technique to supply power to the electric heaters Contacts of the Heat Arm Contactor xCON must also close COOLING CONTROL SINGLE STAGE REFRIGERATION SYSTEM 1SM 06 For chambers with a compressor rated below 3 HP this output triggers triac 2TRC to conduct which energizes the entire refrigeration system The compressor will start along with either the air cooled condenser or the compressor top mounted cooling fan Only moderate cooling will occur For chambers with a compressor rated 3 HP and above this output energizes contactor x CON through triac 2TRC which energizes the entire refrigeration system The compressor will start along with either the air cooled condenser or the compressor top mounted cooling fan Only moderate cooling will occur 1SM 05 This On Off output will energize the Full Suction solenoid valve 10SOL when employed during temperature control only to permit maxim
60. ity sensor for humidity measurement As options you may have auxiliary event outputs and RS232 RS423 RS422 ElIA 485 or IEEE data communications with the VersaTenn III Controller Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 7 TENNEY ENVIRONMENTAL Reach In Type Model Number Designations and Specifications For Model No s TxxRS and TxxRC the xx designation indicates chamber workspace capacity in cubic feet Standard workspace capacities for the T series range from 6 to 40 cubic feet Custom chambers may be larger The Benchmaster series have a workspace capacity of 4 89 cubic feet size not shown in model no The following descriptions explain the remaining model number designations All specifications are based on operation at 24 C ambient temperature altitude at sea level and a 60 Hz power supply Humidity Specification The letter R in the suffix or letter H in the prefix of the model number indicates that the chamber has humidification capabilities The humidity controlled range is from 20 to 98 RH in the dry bulb range from 20 to 85 C as limited by a 3 dewpoint As an option the addition of an external dryer would allow humidification levels as low as 5 RH to be reached at temperatures to 20 C Temperature Specifications The suffix S in the chamber model number indicates that the chamber is equipped with a single stage refrigeration system
61. labels Do not use this equipment in any manner not specified in this manual Improper use may impair the safety features employed and will void your warranty Operators and service personnel must be familiar with the location and function of all controls and the inherent dangers of the equipment before operating or maintaining it Only qualified service personnel should ever be permitted to perform any service related procedure on this equipment For chambers that are not rated Explosion Resistant The air conditioning section contains open wire heating elements which can attain temperatures sufficiently high to ignite gas vapors Do not install test articles that may release explosive or flammable vapors in the chamber Do not place the unit near combustible materials or hazardous fumes or vapors Do not install unit in a corrosive environment A corrosive environment may lead to poor performance and deterioration of unit Make sure the chamber and any remote equipment provided are leveled when installed The chamber door may swing shut on personnel if unit is tilted A main power disconnect may not be provided with your unit If not provided we recommend that a fused disconnect switch on a separate branch circuit be installed as the power source in accordance with all National and Local Electrical Codes If your unit is equipped with a power cord and plug you must utilize a receptacle with the appropriate rating which is on a branch ci
62. ld be tightened and checked for leaks while at low temperature You may use a Halide torch to locate large leaks but make your final test with the more sensitive electronic leak detector This is especially important on the low stage The low stage is gas charged with a relatively small quantity of refrigerant Because of this small leaks can quickly incapacitate the system Testing by Static Charge One advantage of a gas charged system is that its tightness can be checked by periodic observation of static or standby pressure You must read the pressure with all parts of the system at ambient temperature This is important The unit must be shut down at least 24 hours before a static pressure reading is taken To eliminate the possibility of cooling the cascade condenser with the high stage pump down cycle all power to the unit must be off during the shut down period When reading static pressure consider ambient temperature Most static charge data are for a 10 deg F decrease in temperature Due to a large system s considerable thermal mass several days may be required for all components to completely stabilize at a particular ambient Evacuation Granted refrigerants R23 and R404a are expensive but there are times when charges must be recovered A contaminated system must be cleaned and evacuated regardless of refrigerant expense If there is a possibility that moisture non condensibles or the wrong refrigerant contaminated a sy
63. le 1 serves as a means of tripping open the breaker if an alarm or over temperature condition exists and the Master Contactor 1CON has failed to open A time delay resistor 2R is included to prohibit this breaker from tripping when 1CON opens as intended If the breaker has tripped it must be manually reset before the chamber can be started Poles 2 through 5 function as a normal circuit breaker for over current protection Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 29 TENNEY ENVIRONMENTAL 9 0 HEATING DESCRIPTION Heating of the chamber is accomplished with the use of open air low mass nichrome wire heating elements These elements have low thermal lag and provide rapid response to the controller s demands The elements are mounted in the plenum conditioning section This isolates them from the workspace and prevents direct radiation to the product Electric power ratings for your chamber s heater bank are listed on the Electrical or Power Schematic OPEN AIR NICHROME WIRE HEATER ELEMENTS Heater Control State of the art power control is used for the electric heating system Two different heat control methods can be used A Heat Enable contactor xCON may be employed with larger chambers Control Method 1 This method is used with chambers that have a 3 0 KW or less heat load and a 240 VAC control circuit The controller s time proportioned output will trigger triac 1TRC to conduct and energize
64. lete programming and or operating instructions on any of the controllers electrical mechanical components or optional equipment you must refer to their operating manuals included with your Tenney Environmental manual Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 52 TENNEY ENVIRONMENTAL 22 0 PREVENTATIVE MAINTENANCE A N Only qualified service personnel should ever be permitted to perform any service related procedure on this chamber Frequency of preventive maintenance procedures depends upon how the unit is used and upon other circumstances Because of this a hard and fast schedule of maintenance operations is difficult to present Indeed an inflexible schedule might be suitable for one user but completely inadequate for another Therefore we have provided periodic figures when to perform maintenance procedures based on the average chamber use We suggest that you maintain a preventive maintenance log In this log you will record operating notes pressures temperatures and electric readings The log is valuable because it will help maintenance and service people by documenting long term trends and by showing parameter levels when the chamber is operating properly A sample Preventative Maintenance Schedule Log is provided at the end of this section Since the refrigeration system is sealed and the instruments are solid state little maintenance is required on the temperature chamber However the
65. listing would be installed on the side of the chamber Event Outputs are described either in one of the various Option sections or in the Temperature Controller Conditioning Control Functions section for unique applications Important Note Event No 3 Ambient Coil Lock On is provided to give better temperature control near ambient temperatures Its affect will vary with the chamber size process load and ambient conditions We suggest you experiment with your process A typical condition where you may want to lock Event No 3 ON is near ambient conditions e g 25 deg C and 50 RH At higher temperature humidity conditions such as 50 deg C and 95 RH turn Event No 3 OFF With these conditions the cold Ambient Coil would sap out the humidity and cause the chamber to cycle Reference the corresponding Option section for a description of any optional feature Continued Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 51 TENNEY ENVIRONMENTAL 4 If your chamber includes the optional Watlow 93 Controller with TempGard IV feature set this controller s high low temperature limits at this time Refer to the Temperature Alarm and Shutdown Circuit and the Watlow 93 TempGard IV Alarm Setpoint Entry sections for further details 5 Press the VersaTenn III System ON button The conditioner fan s will start and chamber conditioning will begin Important Note For comp
66. ly should not be run for prolonged periods It may have a leak and be low on refrigerant Since the compressor depends upon cool returning refrigerant for cooling it can be overheated when operated in an undercharged system Remember that the compressors have internal overloads with automatic reset these are in addition to circuit breakers Therefore when a compressor cuts out it must be given time to cool so that its internal protector has time to reset Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 64 TENNEY ENVIRONMENTAL SUPPLEMENTAL INSTRUCTIONS Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 65
67. nberg Oven Blue M Parts and service inquiries for equipment within each division should be directed to TPS by any of the following methods Important Please have the Model and Serial Numbers of your unit available when contacting us 1 TPS S 2121 Reach Road ns Williamsport PA 17701 Phone 570 326 1770 Fax Parts Dept 570 320 2160 Fax Service Dept 570 326 3372 Fax Main 570 326 7304 E Mail Address service lunaire com Web site www thermalproductsolutions com Parts Replacement Your equipment has been designed and manufactured to provide years of reliable service In the event a component should fail it is recommended that only OEM approved parts be used as replacements Please contact the Parts Department for component replacement or repair Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 4 TENNEY ENVIRONMENTAL 2 0 SAFETY WARNINGS amp SYMBOLS A AN AN 10 11 12 13 14 15 Read this entire Operation Manual as well as the vendor manuals and cut sheets provided before operating this equipment Failure to adhere to any Safety Warning or failure to follow the proper operating procedures listed throughout any of the information provided could cause damage to your equipment personal injury or death Obey all CAUTION DANGER and WARNING signs labels mounted on the equipment Do not remove any of these signs
68. o the suction side of the low stage system as described above Switch 4PS prevents the compressor from cycling on and off in response to signals from the high pressure cut out switch HPCO HPCO only on 1 5 H P units or greater HIGH STAGE DESCRIPTION The high stage system includes a compressor either an air or water cooled condenser an Ambient Coil a Dehumid Coil and a suction line accumulator to guard against liquid refrigerant return to the compressor Temperature Control Without Humidity The high stage works in tandem with the low stage when controlling temperature without humidity control Refrigerant flow in the high stage is from the compressor as a hot compressed gas to the air or water cooled condenser where the gas cools and condenses to liquid form It then flows to the cascade condenser as modulated by solenoid valve 9SOL when provided In the cascade condenser high stage refrigerant absorbs heat from the circulating low stage refrigerant As it absorbs heat the high stage refrigerant boils and vaporizes It then returns to the compressor through the suction line accumulator SLA The cycle is repeated Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 34 TENNEY ENVIRONMENTAL Temperature Control With Humidity When operating with humidity control only moderate cooling is used The low stage compressor remains off Refrigerant flow in the high stage is from the compressor as a hot compress
69. oid valve 1BSOL This output may be bypassed and the function locked on with Event Output 3SM 02 SSR1 With humidity control SSR1 turns on to provide time proportioned moderate cooling SSR1 energizes the Ambient Coil Feed solenoid valve 1ASOL which feeds liquid refrigerant to the Evaporator Coil It also energizes the Ambient Coil Suction solenoid valve 1BSOL This output may be bypassed and the function locked on with Event Output 3SM 03 SSR5 With humidity control SSR5 turns on to energize the Suction Line Cooling bypass solenoid valve 11SOL With a reduced cooling requirement during humidity control 11SOL injects cool liquid refrigerant into the suction side of the compressor This prevents the compressor from overheating 3SM 03 Event No 3 Ambient Coil Lock On With humidity control this event must be turned ON to lock on cooling with the Ambient Cooling Coil This control is primarily intended for use at ambient temperatures to provide improved temperature control It will bypass the time proportioned control of SSR1 and keep the Ambient Feed and Ambient Suction solenoid valves opened Important Note This event output is provided to give better temperature control near ambient temperatures Its affect will vary with the chamber size process load and ambient conditions We suggest you experiment with your process A typical condition where you may want to lock Event No 3 ON is near ambient conditions e g 25 deg C and 5
70. or suction gas cooling The motor overload is installed directly in the motor windings and will automatically reset and restart the compressor after the motor has cooled NOTE Compressors smaller than 10 HP have the motor overload installed directly in the motor windings This overload will automatically reset and restart the compressor after the motor has cooled Compressors 10HP and larger have the overload installed in the control circuit and the reset button must be pressed for a restart after the motor has cooled Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 37 TENNEY ENVIRONMENTAL 13 0 HUMIDITY SYSTEM A N Make sure the water supply is turned on to the Vapor Flo System before operating To completely turn off the humidification system you must create a separate step and enter a value of 0 1 as the humidity setpoint into the VersaTenn III Controller 13 1 System Overview Vapor Flo Humidity Generators are used to generate water vapor for the humidification of test chambers Vapor is produced by heating water with an electric immersion heater in an enclosed glass bell jar assembly Power to the heater is time proportioned by the controller output The build up of vapor pressure in the bell jar causes a natural migration of vapor from the vapor port to the chamber conditioning plenum through copper or stainless steel tubing Vapor enters the conditioning plenum through a port on the discharge side of
71. ounts only just simply slide the wooden block out Do not loosen any nuts On compressors with spring mounts only you must loosen the compressor hold down nuts just enough to remove the blocks Leave nuts in that position Never loosen nuts beyond top of bolt Important Do to the vibration incurred during shipping and handling it is possible that mechanical connections could become loose Check all connections to make sure they are secure 5 2 Location and Installation of Unit Your equipment has been fully operated tested and balanced in our plant prior to shipment unless notified otherwise Follow the installation requirements below Do not place the unit near combustible materials or hazardous fumes or vapors Ventilation The chamber should be installed in an area where there is good air ventilation especially if an air cooled condenser is used Allow a minimum of 18 inches between any wall and chamber side or to any equipment mounted to the chamber side Do not locate unit in areas of wide ambient temperature variation such as near vents or outdoor entrances Do not install unit in a corrosive environment A corrosive environment may lead to poor performance and deterioration of unit Do not position the chamber in a manner that would make it difficult to operate your main power disconnect switch See Power Connection below Make sure the chamber is leveled when set up Reach In Temp Humidity Test C
72. peratures with mechanical refrigeration was difficult R22 was used down to 80 deg F but its system had serious drawbacks Large and cumbersome the machinery was subject to the many troubles that afflict a compound system operating at suctions as low as 23 inches of vacuum The modern cascade system can reach as low as 120 deg F with suction pressures of 0 PSIG or higher Compact serviceable and reliable today s cascade system is found on thousands of environmental test chambers How It Works Two types of popular cascade systems are expansion valve and capillary tube The system described in this manual is the capillary tube type Refrigerants with low boiling points have correspondingly high condensing pressures at normal ambients They cannot be liquefied by conventional air or water cooled condensing units Therefore low temperature refrigerants are condensed by a separate refrigeration system called the high stage The main job of the high stage in most cascade systems is to condense low stage refrigerant High Stage The high stage is a conventional single stage system having a compressor air or water cooled condenser expansion valve and evaporator The evaporator is the cascade condenser serving the low stage Modern systems use R404a in the high stage making 50 deg F refrigerant temperature possible at 0 PSIG suction pressure Low Stage The low stage is charged with refrigerant in vapor phase only to a specifie
73. ply tests show that appreciable amounts of suspended particles are present as determined by a Certified Test Lab either a 5 micron or 25 micron polypropylene pre filter should be used This filter may be needed in addition to an ion exchanger All filter types can be obtained through TPS If your water supply test shows that appreciable amount of organics free chlorine and chloramines phosphate complexes and turbidity are present as determined by a Certified Test Lab a roughing filter US Filter Model Absorber should be used This filter may be needed in addition to an ion exchanger All filter types can be obtained through TPS Due to periodic changes that could occur in the quality of city or well water supplies you should check your water for resistivity and organic inorganic content every 1 to 2 months These changes could be attributed to droughts floods seasonal changes or land use changes e g farming mining etc gt gt PPP o B Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 13 TENNEY ENVIRONMENTAL Supply Connection The water supply should be 30 40 PSIG maximum The connection is normally made directly to the Water Pressure Regulator WPR 1 4 MPT The regulator is adjusted at the factory for optimal performance which is normally between 10 and 20 PSIG at the input gauge Water Reservoir When the optional 5 Gallon Water Reservoir is used fill the reservoir to just below t
74. ppropriate power supply on a branch circuit of its own Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 18 TENNEY ENVIRONMENTAL For larger or special units that have the power supply hard wired to the chamber connect incoming lines to the main input connections provided in the control section AN Warning High Accessible Current An Earth connection is essential before connecting the power supply Make sure equipment is properly grounded in accordance with all codes 5 13 Application of Power Before energizing any equipment make a visual inspection for loose components electrical connections fittings etc Shut all operating switches to the OFF position before energizing Have trained personnel start and check out the equipment before its first cycle Motor Rotation Check Units with three phase motors must be checked to insure proper motor rotation A red arrow is located on the motor housing to show proper rotation If it is opposite shut down the oven and disconnect the main power supply source Perform Lock Out Tag Out Procedures established by your company Reverse two of the line feeds to obtain proper operation Failure to check motor rotation may result in DAMAGE TO THE EQUIPMENT due to opposite airflow or no airflow 5 14 Operating With an Active Heat Load When operating with an active heat load such as introduced by a powered test unit this heat must be removed or the chamb
75. raise the pressure Always take enough time Systems with expansion tanks connected by a capillary tube or restrictor valve may need several minutes for gas pressure to equalize Keep the refrigerant cylinder upright when charging Above all be careful Do not over pressurize Disconnect the cylinder immediately when charging is complete A leaky cylinder valve could continue to bleed high pressure refrigerant into the system possibly causing it to rupture Do not take chances The saturation pressures of low temperature refrigerants are extremely high Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 62 TENNEY ENVIRONMENTAL 24 0 CHAMBER TROUBLESHOOTING GUIDE This section does not propose to be a complete and comprehensive troubleshooting guide for the serviceman However it attempts to help you locate the causes of possible troubles so that you can make simple repairs or adjustments yourself The information here should also help you in localizing trouble so that you can better describe the malfunction when contacting the Tenney Service Department Refer to the appropriate electrical and refrigeration drawings when using these troubleshooting suggestions TROUBLESHOOTING GUIDE PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION Circuit Breaker 1CB open Close 1CB Contactor 1CON failing to close Press Reset 1PB Check Heat Limiter amp controller alarm outputs 2 Red OVERTEMP Light ON amp Thermal Cutout has opened
76. rcuit of its own Do not position the chamber in a manner that would make it difficult to operate your main power disconnect switch Your power supply line voltage may be too low or too high to properly and safely operate your equipment Before making the power supply connection to your equipment you must follow the specific directions stated under Power Connection in the Installation Instructions section Failing to perform the directions stated may damage your equipment and void your warranty Control panels gauge boxes the conditioning compartment etc contain exposed electrical connections Keep panels in place properly when the unit is in operation Disconnect and Lock Out Tag Out all electrical power from the unit at its source before servicing or cleaning Refrigerant under high pressure is used Only qualified refrigeration mechanic personnel should ever be permitted to perform any service related procedure on the refrigeration system Do not adjust any mechanical components such as refrigeration valves or any electrical components except as directed in this manual Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 5 TENNEY ENVIRONMENTAL 16 Human exposure to temperature extremes can cause injury Do not open the chamber door until chamber temperature drops below 200 F 93 C when applicable Take appropriate precautions before opening oven doors and upon handling any chamber content
77. rgize the high stage compressor SSR1 energizes the Ambient Coil Feed solenoid valve 1ASOL which feeds liquid refrigerant to the Ambient Coil It also energizes the Ambient Coil Suction solenoid valve 1BSOL This output may be bypassed and the function locked on with Event Output 3SM 03 Event No 3 Ambient Coil Lock On With humidity control this event must be turned ON to lock on cooling with the Ambient Cooling Coil This control is primarily intended for use at ambient temperatures to provide improved temperature control It will bypass the time proportioned control of SSR1 and keep the Ambient Feed and Ambient Suction solenoid valves opened Event No 3 will be disabled by the Ambient Coil Disable relay ACR whenever the low stage compressor turns on Important Note This event output is provided to give better temperature control near ambient temperatures Its affect will vary with the chamber size process load and ambient conditions We suggest you experiment with your process A typical condition where you may want to lock Event No 3 ON is near ambient conditions e g 25 deg C and 50 RH At higher temperature humidity conditions such as 50 deg C and 95 RH turn Event No 3 OFF With these conditions the cold Ambient Coil would sap out the humidity and cause the chamber to cycle Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 25 TENNEY ENVIRONMENTAL HUMIDITY CONTROL HUMIDIFICATION SS
78. s 17 Do not modify any component on this unit Use only original equipment manufactured OEM parts as replacement parts Modifications to any component or the use of a non OEM replacement part could cause damage to your equipment personal injury or death 18 Do not overload the floor of the chamber workspace or load the unit unevenly INTERNATIONAL WARNING SAFETY SYMBOL DEFINITIONS Obey all DANGER WARNING and CAUTION labels shown in the manual and mounted on the equipment Do not remove any labels mounted on the equipment WARNING OF HAZARDOUS AREA WARNING OF DANGEROUS ELECTRIC VOLTAGE WARNING OF HOT SURFACE e D ee EARTH GROUND PROTECTIVE CONDUCTOR TERMINAL Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 6 TENNEY ENVIRONMENTAL 3 0 PRODUCT SPECIFICATIONS amp OVERVIEW Application This manual applies to the following reach in temperature humidity test chambers which employ a capillary tube type refrigeration system Benchmaster Models BTRS BTRC T Series Models T6RS T6RC T10RS T10RC T20RS T20RC T30RS T30RC T40RS T40RC T Series Models TH27 TH65 Note This manual may also apply to special chambers with alternate model numbers listed below For Model XXXX S N xxxxx the following custom specifications apply Temperature Range XX to xxx C xx deg after stabilization Humidity Range xx
79. s metered by a capillary tube type valve Capillary Tube A capillary tube is a length of tubing of small diameter with the internal diameter held to extremely close tolerances It is used as a fixed orifice to meter the proper feed of liquid refrigerant Thermostat A thermostat TS is mounted on the suction return line near the low stage compressor to monitor the temperature of the return gas flow When a predetermined high temperature is reached the thermostat will energize the Artificial Loading solenoid 14SOL The setting is normally 70 degrees Fahrenheit Load Limit Switch A high pressure cut in sensor monitors the pressure inside the low stage compressor and will activate the Load Limit Switch 4PS when the low stage discharge pressure reaches 280 PSIG This will energize the Artificial Loading solenoid 14SOL 4PS will be deactivated when the pressure falls to 240 PSIG Artificial Loading In response to the Thermostat switch TS or the Load Limit switch 4PS the Artificial Loading solenoid will inject liquid refrigerant into the suction side of the low stage It will first enter the expansion tank where the added volume permits the charging of additional refrigerant without increasing the standby or charging pressure beyond workable limits Refrigerant gas is then sucked out of the expansion tank and metered through a capillary tube to the suction side of the low stage compressor This action will maintain a positive cool refrigerant
80. secure Reference the corresponding Option section in this manual and your chamber specifications for more details Warning Carbon Dioxide gas displaces oxygen Make sure the area surrounding the Vent Port chamber is well ventilated to dilute the gas checkyalve vented from the chamber vent port checkvalve Note There is no flow adjustment for the CO2 supply A paka a So 3 ae ccess Port fixed orifice on the injection port inside the chamber regulates the supply CO2 Supply Connection Note Your equipment configuration may be slightly different from what is shown CO2 Boost Cooling Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 17 TENNEY ENVIRONMENTAL 5 12 Power Connection A N Warning Before making the power supply connection to your unit you must perform the following procedure 1 Verify the power supply voltage rating established for your chamber listed above The voltage rating is also found on the serial tag on the side of the oven Note the rated value here 2 Measure and record the intended voltage source Note the measured value here 3 Reference the Line Voltage Min Max Tables below Verify that the power supply voltage source you measured and recorded is within the minimum and maximum allowable operating voltages for your chamber rating If it is not within this operating range do not make the power connection Otherwise erratic operation and damage may occur to yo
81. stem recover the charge and evacuate Select a two stage pump capable of pumping the system down below 200 microns and connect an appropriate gauge to ready system pressure The ordinary compound refrigeration gauge is inadequate however a thermocouple gauge is ideal Evacuating a leaky system is an exercise in futility Therefore make sure the system is absolutely tight before beginning evacuation Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 61 TENNEY ENVIRONMENTAL Charging a Low Stage 1 Do not charge liquid into the low stage 2 Do not charge the system when it is below room temperature 3 Do not use charging hoses on very high pressure refrigerants or low stage refrigerants Cylinder pressure exceeds 500 PSIG 4 Never charge the unit when it is running As you will note from the above low stage charging procedure differs from the conventional method Correct charging pressure will be noted on the equipment nameplate or in the instructions Remember that it is important that you charge by pressure not by volume of refrigerant Use 1 4 inch copper tube between refrigerant cylinder and system Open the cylinder valve very slowly Charge into the suction side while closely watching the discharge gauge When correct pressure is reached shut off the refrigerant cylinder valve allowing the system to equalize from 10 to 15 minutes If the pressure drops crack open the cylinder valve and slowly
82. stem 1PS 2PS is typically set at 300 PSIG Low Pressure Cutout 1PS 2PS Opens if the compressor suction pressure falls below a preset value Probable causes are a loss of refrigerant either stage or restricted air flow across the evaporator low stage 1PS 2PS is typically set at 6 inches of vacuum High Low Pressure Switch Oil Pressure Switch OPS Low Oil Pressure Cutout 1 OPS 2 OPS For 3 HP or larger compressors only Opens if the compressor oil pressure falls below a preset value Probable causes are low oil level or a foaming of the oil due to refrigerant flood back Important Alert The low oil safety switch has a built in time peel oss A delay to give the compressor time to establish oil pressure on f EE LUBE oi conor startup Following a trip repeated attempts to reset without Pra correcting the problem can result in significant running time without adequate lubrication with a high probability of compressor failure If the switch opens more than a few times following a reset have the system inspected by a qualified refrigeration mechanic Oil Pressure Switch Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 36 TENNEY ENVIRONMENTAL Motor Overload This device opens if the motor windings exceed a preset temperature Probable causes are insufficient flow across the motor due to a refrigerant loss or a failure of the liquid injection valve provided f
83. surrounding the chamber is well ventilated to O Checkvalve dilute the gas vented from the chamber vent port checkvalve LN2 Flow Adjustment valve which permits the adjustment of nitrogen flow to avoid Access Port incomplete evaporation at varying LN2 supply pressures As the chamber cools to the extreme cold temperature limit complete evaporation of liquid nitrogen may not occur if the supply pressure is allowed to drop Incomplete evaporation will cause droplets of liquid to fall to the chamber floor and cause puddling Do not allow liquid nitrogen to contact the door A N gasket Exposure to LN2 will damage the gasket and violate the seal LN2 Boost Cooling LN2 systems are provided with a manually set flow adjusting Chamber Cong LN2 Supply Connection amp Flow Adjustment Valve A setting of 4 turns open of the valve generally provides good performance at a supply pressure of 20 to 25 PSIG This valve may be readjusted as necessary to accommodate the supply pressure at the end use point Note Your equipment configuration may be slightly different from what is shown Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 16 TENNEY ENVIRONMENTAL 5 11 CO2 Connection For Optional Equipment Your chamber will require a supply of liquid carbon dioxide for the CO2 Boost Cooling option The supply may range up to 1000 PSIG The connection is type 1 8 NPT Make sure the connection is
84. t such as when you need to change controllers To access the Setup Menu press the Up Arrow and the Down Arrow keys simultaneously Setup parameters are shown in the lower display Parameter values appear in the upper display Press the Advance key to scroll through the menu Values for the Low Range Limit rL and the High Range Limit rH are the low and high temperature ratings of your chamber minus and plus 4 degrees respectively SETUP MENU for WATLOW 93 TEMPGARD IV default Din O a m O default High Limit plus 4 deg ac ep O default PE LowLimitminus4deg Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 48 TENNEY ENVIRONMENTAL 19 0 LinkTenn32 SOFTWARE Optional LinkTenn32 is a Microsoft Visual Basic Software application designed for the Microsoft Windows family of PC Operating Systems LinkTenn32 utilizes a Multi Document Interface MDI familiar to Windows software applications so more than one Environmental Chamber Window can be used at a time LinkTenn32 provides centralized remote monitoring and control of multiple process controllers simultaneously LinkTenn32 supports the following controllers TPS VersaTenn Ill IV and V Watlow 942 amp F4 and Partlow MIC 1462 Controllers The major features provided include Interactive remote control and monitoring Alarm reporting and notification via Email or Fax User friendly profile program
85. ted by the second capillary tube described above Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 31 TENNEY ENVIRONMENTAL Refrigerant Flow During Dehumidification A Dehumidify Coil is provided in the chamber conditioning section however it is mounted slightly away from the main circulating air stream The reason is to minimize sensible heat loss Refrigerant flow is from the compressor as a hot compressed gas to the air or water cooled condenser where the gas cools and condenses to liquid form It is directed through solenoid valve 4SOL to the Dehumidify Coil Water vapor condenses on this coil due to the reaction of warm moist chamber air coming in contact with a cold coil surface Heat exchange occurs as the refrigerant boils and vaporizes It then returns to the compressor through the suction line accumulator SLA The cycle is repeated Thermostat TS except for Model BTRS A thermostat is mounted on the suction return line near the low stage compressor to monitor the temperature of the return gas flow When a predetermined temperature is reached typically set for 70 F the thermostat will energize and open the Suction Line Cooling bypass solenoid valve 11SOL This will inject cool liquid refrigerant through a capillary tube to the compressor This action prevents overheating of the compressor Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 32 TENNEY ENVIRONMENTA
86. that automatically selects heating cooling and humidity modes as required with total programming capabilities of temperature humidity versus time The following main features are employed Note Not all inputs outputs listed are used Two Channel Profiling 10 Profiles 99 Steps Max Automatic amp Manual Control 2 Process Inputs RTD Std and Dry Capacitance Type Humidity Sensor 1 Event Input 10 Temp Control Outputs Time Proportioned and On Off Control 5 Humidity Control Outputs Time Proportioned and On Off Control 6 Event Outputs Optional 1 Alarm Output Standard Guaranteed Soak Standard Communications Serial Optional gt gt gt He H H e Oe o o SYSTEM ON System ON OFF Button VERSATENN III CONTROLLER Note Temperature values are shown in the upper VersaTenn III display Relative humidity values are shown in the lower VersaTenn III display preceded by RH To display humidity go to SYSTEM with the MODE key and press ENTER Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 21 TENNEY ENVIRONMENTAL Controller Configuration The pre programmed controller configuration for your chamber is documented in the Test Report which is located in the Supplemental Instructions Section Refer to the controller s user manual for more information Important The configuration set up is mainly provided for your reference Not all of the parameters shown
87. tricted Inadequate flow will decrease system efficiency and drive up compressor head pressure causing it to trip out The water supply pressure must be 40 PSI Delta Inspection Period 30 Days Conditioner Fan Blower Wheel when employed A Remove All Power From Chamber Inspect and clean the conditioner fan in the conditioning plenum Make sure the fan spins freely and that it is tight on its shaft Inspection Period 6 Months Evaporator Cooling Coil A Remove All Power From Chamber Clean the evaporator cooling coil in the conditioning plenum Inspection Period 6 Months General Electrical Connections A Remove All Power From Chamber Inspect inside the control panel and the machinery compartment for loose electrical connections frayed wires loose components or other potential problems Inspection Period 6 Months Electric Heaters A Remove All Power From Chamber Inspect the electric heaters inside the chamber conditioning plenum and look for sagging elements broken insulators or other defects Inspection Period 6 Months Electrical Supply Voltage Measure the power supply voltage to your oven and verify that it is within the 10 tolerance established for the nameplate rating of your oven Inspection Period 6 Months Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 54 Controller Calibration The main temperature and high limit controllers should be checked for temperature indic
88. um refrigerant flow from the evaporator coil back to the compressor 10SOL bypasses a restrictive hand valve When energized 1SM 05 will also arm outputs 1SM 07 and 1SM 08 Reach In Temp Humidity Test Chambers Refrig Capillary Tube Type VT3 Page 23 TENNEY ENVIRONMENTAL 1SM 07 This is a time proportioned output that energizes the Full Ambient Coil solenoid valve 1SOL which permits full refrigerant flow to the Evaporator Coil 1SOL bypasses the capillary device that precedes 1ASOL and restricts flow to the evaporator cooling coil This output functions only after being armed by outputs 1SM 05 and 1SM 08 1SM 08 This output will turn on when the chamber setpoint is below 20 C allowing full cooling to be modulated by output 1SM 07 1SM 09 This is a time proportioned output that is the compliment of output 1SM 07 i e it is off when 1SM 07 is on and vice versa It energizes the Suction Line Cooling bypass solenoid valve 11SOL to inject cool liquid refrigerant into the suction side of the compressor This occurs with reduced cooling requirements to prevent overheating of the compressor 1SM 10 This output will always turn on when cooling is required 1SM 10 energizes the Ambient Feed Coil solenoid valve 1ASOL which feeds liquid refrigerant to the Evaporator Coil Only moderate cooling occurs because refrigerant flow is restricted by the capillary tube that precedes 1ASOL It also energizes the Ambient Coil Suction solen
89. ur equipment which may void your warranty If you have any questions please call the TPS Service Department Important One of the most common causes of equipment malfunction is low line voltage as the power source to the unit Ordinarily in this condition the heat output would be reduced and the system s motors would operate erratically eventually overheat and shut down You must be certain that your equipment is connected to a circuit with an adequate voltage and current source An oversupply voltage would also cause erratic operation and eventual shutdown or damage to your equipment 60 HERTZ SUPPLIES 50 HERTZ SUPPLIES LINE VOLTAGE MIN MAX TABLE LINE VOLTAGE MIN MAX TABLE Nominal Minimum Maximum Nominal Minimum Maximum Voltage Voltage lt lt Voltage Voltage vomas Operation outside these Operation outside these limits can result in damage limits can result in damage to the system s motors to the system s motors Making the Power Supply Connection to the Chamber A main power disconnect switch is normally not provided with your chamber We recommend that a fused disconnect switch on a separate branch circuit be installed as the power source to your chamber in accordance with all national and local electrical codes Reference your Electrical or Power Schematic for all electrical requirements The power connection is made via a cord and plug for small standard units Connect the plug to a receptacle that has the a
90. utilizes a second capillary tube in series with a primary one This restricts the flow of refrigerant to the evaporator coil allowing very fine moderate temperature control The Ambient Coil Feed and Ambient Coil Suction solenoid valves are both energized When full cooling is required the Full Ambient solenoid valve 1SOL is energized which allows refrigerant flow to bypass the second capillary tube The Full Suction solenoid valve 10SOL is also energized in this mode Refrigerant flow is from the compressor as a hot compressed gas through the oil separator and then to the air or water cooled condenser Here the refrigerant cools and condenses to liquid form It then flows through various capillary tubes to the evaporator cooling coil in the chamber conditioning section Warm chamber air circulates through the cooling coil and heat exchange occurs as the liquid refrigerant boils vaporizes and absorbs heat The vaporized refrigerant returns to the compressor through the suction line accumulator SLA The cycle is repeated A Suction Line Cooling solenoid valve 11SOL is included to inject liquid refrigerant into the suction side of the system in order to maintain a positive cool refrigerant flow when operating at reduced capacities Temperature Control With Humidity When operating with humidity control only moderate cooling is used The Ambient Coil Feed and Ambient Coil Suction solenoid valves are both energized Refrigerant flow is restric
91. which incorporates one compressor Either an air cooled or water cooled condenser is used to cool hot high pressure refrigerant gas from the compressor and change it to its liquid state The temperature controlled range is from 40 to 200 C 0 3 C The exception to this standard range are the Models BTRS and T6RS which have a low range of 34 C The Models TH27 and TH65 also incorporate a single stage refrigeration system but have a smaller temperature operating range than those mentioned above Either an air cooled or water cooled condenser is used to cool hot high pressure refrigerant gas from the compressor and change it to its liquid state The temperature controlled range is from 20 C to 100 C 0 2 0 3 respectively The suffix C in the chamber model number indicates that the chamber is equipped with a cascade refrigeration system which incorporates two compressors This is a multiple system consisting of a low stage and a high stage system Both are integrated in a highly efficient design to permit extreme low temperatures to be attained This is achieved by utilizing a cascade condenser in the low stage where low stage refrigerant is cooled and condensed by high stage refrigerant Either an air cooled or water cooled condenser is used to cool hot high pressure refrigerant gas from the high stage compressor and change it to its liquid state The temperature controlled range is from 73 to

Advanced Test Equipment Rentals

Contents

Download Pdf Manuals

Related Search

Related Contents