Installation/Service Manual Microprocessor Controlled Low
Contents
1. LINE VOLTAGE ONE SIDE OF POWER LINE L_ PN 00394901 aes sal 11991 et 8 1 5 19 91 II a FUSE TERM a a 0 09 LMH AII IJJ AAAA HH LD L 111 128 60 HZ LINE 230 VAC 60 HZ 702 2301 0 ASSY PCB CPU ASS PCB UMIT P N 00381002 seo P N 00394601 4 5 5 304 J305 TEMPERATURE PROBE VY YELLOW 5 a g amp H AOM SLEEVED MARKER MUST BE 5 AUX D A P C B WHITE 2 2 A d A __ a 4 2 ASSY PCB ASSY PCB ee E H E _ P N 00382001 P N 00393702 NO OPTIONAL D CABLE ASSEMBLY 5 542634 5 gt gt gt o gt BLUE 7 1 CONDUCTOR OF ORIGINAL LINE CORD RIBBED INSULATION OVERLOAD PROTECTOR ORANGE BLACK HEATER 550W YELLOW THERMAL CUTOFF P N 239193 WHITE 18 PARTS REPLACEMENT LIST COMPRESSOR RUN CAPACITOR FOR MODEL 2 81001053 MOTOR INTERNAL FAN FOR MODEL 2 81001054 PRECISION warrants its products against defects material and workmanship when used under appropriate conditions and in accordance with2. Excessive frost buildup is the result of the introduction of outside moisture This may be caused by the evaporation of liquids placed in the chamber or it may be the result of excessive opening of the door during high humidity conditions The door gasket should also be examined for proper seal if repairs necessary contact White Westinghouse or adjust door hinges See page 8 Excessive line voltage variation Incubator will operate satisfactorily over full temperature range 10 C to 50 C when line voltages vary from nominal voltage by 5 or 10 Larger voltage variations may impair the Temperature Control Correct as required 10 Excessive ambient temperature variation If the incubator is placed close to the air conditioning outlet hot radiators or direct sunlight or if the ambient temperature changes drastically the chamber temperature will be affected Correct as necessary CAUTION THE INCUBATOR SHOULD NOT BE OPERATED IN AN ENVIRONMENT WHERE THE AMBIENT TEMPERATURE EXCEEDS 90 F AS THE COMPRESSOR THERMO OVERLOAD WILL BE TRIPPED AND WILL RESULT IN A WIDE BAND CONTROL CYCLE OF APPROXIMATELY 4 SUCH CYCLING SHOULD BE MISINTERPRETED AS A MALFUNCTION OF THE ELECTRONIC CONTROLS 11 Overcharged compressor This would happen only if compressor was overcharged after installation For correct charge see nameplate located behind lower portion of door If unit has more charge than shown it will no
3. Status Display Type Listed are the numbered selections with explanations and examples of the values displayed on your computer s monitor when the incubator transmits information 0 Used for a raw one line status output suitable for importing into a spreadsheet 1 Used for a multi line format with English headings with continuous screen 2 Used for the format as 1 but preceded by a clear screen command used by terminals or computers running terminal software This mode overwrites the previous transmission With Status Display Type 0 10 50 0 Where 10 Actual Temperature 5 0 Setpoint Temperature 0 Normal With Status Display Type 1 or 2 Actual Temperature 10 Setpoint Temperature 5 0 Alarm Status Normal LOW HIGH 4 Allow the setup to time out The incubator is now ready to communicate with your computer Setting up the computer Your communications software will most likely have a setup routine to set the parameters listed below These are the values the incubator is using so you must match your computers software parameters accordingly Also you will probably have to select the COM serial port you chose when you connected the cable from your computer to the incubator The software may ask what format the data is in You should choose ASCII Parameter Settings Baud Rate Baud Rate value selected earlier in Step 1 Parity None 0 Data Bits Eight 8 Stop Bi
4. BEFORE APPLYING ELECTRIC POWER TO THE COMPRESSOR 3 CAUTION SHOULD BE EXERCISED BY SERVICE PERSONNEL WHEN SERVICING REFRIGERATION SYSTEM 4 SERVICE SHOULD BE PERFORMED BY A CERTIFIED REFRIGERATION TECHNICIAN ONLY INSTALLATION AND OPERATION OF THE RS232 OPTION 1 Remove the eight 8 screws securing the control panel There are four 4 on the top and 2 on each of the sides Then remove the cover by sliding it towards the front of the incubator Slide open the auxiliary panel door and locate the mounting area of the RS232 board as shown on page 4 Mount the RS232 printed circuit board assembly using the screws or standoffs provided See Figure below Connect one end of the cable to J304 located on the left edge of the left printed circuit board p n 34381002 Be careful of alignment Connect the other end of the cable to the cable connector on the RS232 PCB assembly see sketch Replace the control panel and secure with the eight 8 screws The RS232 PCB provides a bi directional communication port that will allow the user to monitor the performance or the change the operating valves of the incubator from a remote computer RS232 Communication will require a communication program such as a modem program installed in your computer which will allow the storage of data within your files The RS232 PCB utilizes one of the users computer serial ports such as COM1 2 The communication software must be
5. appropriate operating instructions for a period of no less than one 1 year from the date of delivery of the products Sole obligation of PRECISION shall be to repair or replace at our option FOB factory or locally without charge any part s that prove defective within the warranty period provided the customer notifies PRECISION promptly and in writing of any such defect Compensation for labor by other than PRECISION employees will not be our obligation Part s replacement does not constitute an extension of the original warranty period PRECISION MAKES NO WARRANTY OR MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE OR OTHER WARRANTY EXPRESSED OR IMPLIED AS TO THE DESIGN SALE INSTALLATION OR USE OF ITS PRODUCTS AND SHALL NOT BE LIABLE FOR CONSEQUENTIAL DAMAGE RESULTING FROM THE USE OF ITS PRODUCTS PRECISION will not assume responsibility for unauthorized repairs or failure as a result of unauthorized product modifications or for repairs replacement or modification negligently or otherwise improperly made or performed by persons other than PRECISION employees or authorized representatives While our personnel are available to advise customers concerning general applications of all manufactured products oral representations are not warranties with respect to particular application and should not be relied upon if inconsistent with product specification or the terms stated herein In any event the terms and conditions contain
6. indicating The sixth indicator is for a high or low temperature alarm condition An internal audible alarm will also operate when this alarm indicator illuminates 4 ON OFF SWITCH The On Off switch provides the main power to the incubator 5 MUTE KEY This key is used to silence the internal audible alarm and to also de activate the external alarm device if one is being used 6 HIGH LOW LIMIT KEY This key is used to view the high or low temperature alarm setpoint The first depression of the key selects the high limit The second depression selects the low limit The respective green indicator lamp will light 7 SET TEMP CAL KEY This key is used to view the operating setpoint temperature or calibrate the unit to a certified traceable thermometer The first depression of the key selects the operating setpoint and the second depression selects the calibration mode The respective green indicator lamp will light 8 ENTER KEY This key is used after any setpoint selection is made to enter the value into memory 9 UP DOWN ARROW KEYS These keys are used to increase or decrease the desired setpoint value low temperature INCUBATOR 815 perat Low Temperature Alarm Set Point Alarm Condition Explanation of Auxiliary Panel On the left side of the incubator control panel there is an auxiliary panel which has the items shown in the figure
7. plug which mates with a standard three prong grounding wall receptacle to minimize the possibility of electric shock hazard from this apparatus The customer should have the wall receptacle and circuit checked by a qualified electrician to make sure the receptacle is properly grounded Where a two prong wall receptacle is encountered it is the personal responsibility and obligation of the user to have it replaced with a properly grounded three prong wall receptacle WARNING DO NOT UNDER CIRCUMSTANCES CUT OR REMOVE THE THIRD GROUND PRONG FROM THE POWER CORD DO NOT USE A TWO PRONG ADAPTER PLUG Determine the total amount of current presently being used by other apparatus connected to the circuit that will be used for this unit It is critical that the added current demand and other equipment on the circuit not exceed the rating of the fuse or circuit breaker in use CAUTION BE SURE THAT THE POWER SUPPLY IS OF THE SAME VOLTAGE AS SPECIFIED ON THE NAMEPLATE When loading the incubator a space of 1 2 must be allowed between adjacent items This will allow maximum air circulation which is necessary for proper temperature uniformity The uniformity will be adversely affected if air circulation is obstructed Liquid containers should never be placed in the incubator without covers The evaporation of moisture within the chamber will only add frost and hasten the need for defrosting This chamber is not self defrosti
8. spreadsheet program The user can also change the setpoint temperature from their personal computer and periodically monitor the actual temperature setpoint temperature and alarm status 4 RECORDER OUTPUT This is a DC millivolt output which represents the temperature of the incubator The recommended main use of this is with a chart recorder having an input impedance of at least 1 megohm The scaled temperature output change is 10 millivolt degree When the incubator is operating at a negative temperature the chart recorder output is still positive Use the chart below to relate temperature to output voltage Recorder Temperature Output Millivolts 100 Degree C 10 484 RELAY LIN VOLTAGE CLASS NO NC 2 CINNECTIIN DWY 8 232 OUTPUT 200 EX 300 400 500 600 700 Located on the chart recorder printed circuit board is an offset potentiometer R3 If for some reason the recorder output voltage does not match the temperature as shown in the chart this potentiometer can be used to tune it in When connecting a chart recorder to the recorder output connector it is recommended to use a shielded cable with the shield grounded at the chart recorder and to keep the cable short as possible INSTRUMENTATION PORT Located on the rear side of the incubator is an in
9. the following setup mode there is a five 5 second time out feature that is active following each entry If the five 5 seconds has been exceeded the unit will return to the normal operation mode If the time out occurs before the value was entered start over 1 With the incubator ON simultaneously press and hold the UP and DOWN keys then press the ENTER key The letters will be shown in the display A number other than 96 might be shown in the display Choose the number appropriate for the Baud Rate desired 3 300 6 600 12 1200 24 2400 48 4800 96 9600 Press the UP or DOWN key until the display reads your selection Press ENTER The baud rate has been entered 2 The display should change to the following Again the number in the display might be different than 0 1 but it will have a decimal point l l l Choose the number appropriate for the Status Update Time Interval desired 0 0 Minutes No report 0 1 Minutes Between reports 0 5 Minutes Between reports 1 0 Minutes Between reports 2 0 Minutes Between reports 5 0 Minutes Between reports 10 0 Minutes Between reports 30 0 Minutes Between reports 60 0 Minutes Between reports Press the UP or DOWN key until the setpoint display reads your selection Press ENTER The value is entered 3 The display should have changed to the following Again the number in the display might be different than 1 This selection is for
10. 0 C to 50 C 120 minutes Compressor ON Cool Down Time From 50 to 10 C 100 minutes MODEL 815 Temperature Temperature Set Point Uniformity Sensitivity o 20 0 0 1C 37 0 NOTE THE ABOVE PERFORMANCE FIGURES ARE BASED UPON THE FOLLOWING OPERATING CONDITIONS LINE VOLTAGE 110 5 TO 112 5 AMBIENT TEMPERATURE 22 5 TO 24 C Theory of Operation The refrigeration system defrost heater and air circulating fan are used in conjunction with a microprocessor controlled proportioning circuit to achieve sensitive temperature control A RTD Resistance Temperature Detector located in the airstream senses any temperature deviation from the control point and heat is provided proportionally to maintain the desired temperature Regardless of what temperature is being maintained the compressor operates continuously This constant operation alleviates component failures associated with cycle type operation The circulating fan provides even air distribution throughout the chamber and assures temperature uniformity EXPLANATION CONTROLS Front Panel 1 HEATER ON LAMP The Heater On lamp is illuminated when power is applied to the heater 2 LED DISPLAY Four digits are used to display the actual set calibrate high limit and low limit values 3 INDICATOR LAMPS There are five 5 green indicator lamps that are used to inform the user which parameter the display is
11. 25 0 lt CR gt Example 2 To change Setpoint Temperature to 8 C type 8 lt gt A Actual Temperature temperature within the incubator T Setpoint Temperature The temperature at which the user has selected the incubator to operate R Baud Rate The rate at which data is transmitted between the incubator and your computer 0 300 Baud 1 600 Baud 2 1200 Baud 3 2400 Baud 4 4800 Baud 5 9600 Baud Status Update Time Interval The time between data messages sent from the incubator to your computer 0 0 Minutes No report 1 0 1 Minutes 6 seconds 2 0 5 Minutes 30 seconds 3 1 0 Minutes 4 2 0 Minutes 5 5 0 Minutes 6 10 0 Minutes 7 30 0 Minutes 8 60 0 Minutes V D O EPROM Version Number The incubator software version level Status Display Type Selection of format that data is sent to your computer 0 Used for a raw one line status output suitable for importing into a spreadsheet 1 Used for a multi line format with English headings 2 Used for the format as 1 but preceded by a clear screen command used by terminals or computers running terminal software Display the Alarm Status The alarm has thee 3 possible values 0 Normal no alarms 1 Low alarm 2 High alarm WIRING DIAGRAMS WIRING DIAGRAM 815 INCUBATOR 120V NOTE DUAL FANS ARE USED ON ONLY ON BODYS WITH MODEL MFU20F 36W9 SINGLE FAN USED
12. 9 RTD Temperature Probe see Remedy 3 Step D and or Remedy 4 Power Supply PCB Assembly see Remedy 3 Overcharged compressor see Remedy 11 Differences between Temperature Set and Digital Temperature Readout see performance figures page 3 RTD Temperature Probe see Remedy 3 Step D and or Remedy 4 Malfunctioning Power Supply PCB assembly see Remedy 3 Takes an extremely long time to reach high temperature set point No air circulation in chamber inoperative fan see Remedy 1 Low line voltage less than 110V see Remedy 9 Power Supply PCB assembly see Remedy 3 Overcharged Compressor see Remedy 11 Display indicates Jf Tf GULL Malfunctioning RTD Temperature Probe Remedy 4 POSSIBLE REMEDIES 1 Inoperative Fan Open the door Place your hand near the grill at the top rear of the chamber and check for air circulation If there is no air circulation the fan motor is malfunctioning Contact White Westinghouse for replacement part See page 8 2 Burned out heater To check this the control panel cover must be removed WARNING HAZARDOUS HIGH VOLTAGE CONDITIONS EXIST INSIDE CONTROL PANEL TURN OFF LINE SWITCH ON FRONT PANEL AND UNPLUG LINE CORD Remove all screws that fasten the cover Locate nylon connector J1 on the Limit Alarm PCB Assembly Depress both ears on the plug housing and gently pull out the connector With an Ohmmeter measure the resistance between TB1 4 Orange wire and
13. HIGH LOW LIMIT key twice green Low Temperature Alarm Setpoint indicator should be lit Use the UP or DOWN arrow keys to select your limit value Then press the ENTER key If the LOW LIMIT value you have selected is above the operating setpoint temperature the incubators alarm will activate NOTE SOFTWARE VERSION 2 00 HAS A 30 MINUTE DELAY FOR THE LOWAND HIGH ALARM TO AVOID NUISANCE ALARMS CAUSED BY DOOR OPENINGS SERVICING WARNING SERVICE SHOULD BE PERFORMED ONLY BY QUALIFIED SERVICE PERSONNEL EXERCISE CARE AS LINE VOLTAGE IS PRESENT IN THE CONTROL COMPARTMENT If it is ascertained after review of the Troubleshooting Section that refrigeration service is needed contact the White Westinghouse Service Organization In any communication with White Westinghouse or Precision include the model and serial numbers from both nameplates located near the bottom of the door opening Specific reference must be made to White Westinghouse Policy Procedure Letter 82 2605 which covers the service requirements for this particular model For assistance in locating the nearest White Westinghouse authorized service or parts supplier contact White Westinghouse P O Box 7181 Dublin OH 43017 1 800 245 0600 TROUBLESHOOTING Problems encountered with any constant temperature chamber will most frequently be related to temperature control Before proceeding with detailed troubleshooting be certain that the Low Limit and Hi
14. IN MODEL FFU2064DW1 815 ASSY PCB PWR SUP J2 P N 00394901 ASSY PCB LIMIT ALARM P N 00394601 ASSY PCB CPU P N 00381002 ASSY PCB DISPLAY P N 00395001 TEMPERATURE PROBE 9 8 8 8 5 4 5 TT TP 304 J305 5 5 5 5 5 5 55555 7 7 A A A zl 2 z z 5 YELLOW 5 a sid 654 s s SLEEVED MARKER MUST 5 AUX D A P C B 9 E 2 o A A A 8 oe se pe e ASSY PCB ASSY PCB a ER MA 8 ALARM OUTPUT RS232 AUX D A P N 0032001 P N 00393702 AK SEE NOTE OPTIONAL CTE DP s 542634 5 5 i 8 5 a 8 20737 6 85 4 AN A 1 CONDUCTOR OF ORIGINAL LINE CORD RIBBED INSULATION BLACK WHITE YELLOW pp gt po pp ph OVERLOAD ae PROTECTOR ORANGE BLACK m j BLACK WHITE HEATER 550W THERMAL CUTOFF LINE YELLOW WHITE P N 239193 FAN 120 VAC 60 HZ WHITE WIRING DIAGRAM 815 INCUBATOR 230V NOTE DUAL FANS ARE USED ON ONLY ON BODYS WITH MODEL MFU20F 36W9 SINGLE FAN USED IN MODEL FFU2064DW1 815 ASSY PCB PWR SUP
15. LAY CONDITION monn OPEN CIRCUIT Luu SHORT CIRCUIT 11 Before coming to the conclusion that the probe is bad when one of these displays appear check the connection of the probe to the circuit board 5 RTD Temperature Sensor Probe Location The Proper RTD location is important The RTD is supported by the stainless steel bracket attached on the rear wall and near the top of the chamber Two tube shaped clips securely support the RTD probe into place The RTD must be inserted fully into its support bracket 6 Constantly Experiencing Low temperature Alarm If the incubator is constantly going into low temperature alarm then most likely the setpoint temperature setting is too close to the low temperature alarm setpoint setting The setpoint temperature setting should be a minimum of 2 above the low temperature alarm setting If the problem persists then see Remedy 3 7 Constantly experiencing high temperature alarm If the incubator is constantly going into high temperature alarm then most likely the setpoint temperature setting is too close to the high temperature alarm setpoint setting The setpoint temperature setting should be a minimum of 2 below the high temperature alarm setting If the problem persists then see Remedy 3 NOTE SOFTWARE VERSION 2 00 HAS A 30 MINUTE DELAY FOR THE LOWAND HIGH ALARM TO AVOID NUISANCE ALARMS CAUSED BY DOOR OPENINGS Ice buildup on evaporator coils
16. PRECISION Installation Service Manual Microprocessor Controlled Low Temperature Incubator Model 815 Precision 170 Marcel Drive Winchester VA USA Phone 540 869 8623 Toll Free 800 621 8820 FAX 540 869 8626 Manual P N 36100114 34001729 Rev D Dated 15 December 2004 THE MATERIAL IN THIS MANUAL IS FOR INFORMATION PURPOSES ONLY THE CONTENTS AND THE PRODUCT IT DESCRIBES ARE SUBJECT TO CHANGE WITHOUT NOTICE PRECISION MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THIS MANUAL INNO EVENT SHALL PRECISION BE LIABLE FOR ANY DAMAGES DIRECT OR INCIDENTAL ARISING OUT OF OR RELATED TO THE USE OF THIS MANUAL For repair information or replacement parts assistance from the manufacturer call Customer Service using our toll free telephone number 800 621 8820 FAX 540 869 0130 REVISION STATUS INDEX DATE AMENDED PAGES NOTES Initial Release Update parts list for new kit s Removed dual fans updated parts list Update for base model FFU2064DW1 Contents 255 55 1 Unpacking and 2 1 General IN OrmMatiOT 2 Data 2 Explanation 3 inst
17. TB1 6 Red wire The proper heater resistance is 24 ohms If heater resistance is correct then measure between one heater lead RED or ORANGE and incubator ground it must be infinity Open If the heater resistance check indicates an open circuit it may or may not be open In series with the heater is a thermal overload switch It might be that this thermal overload is open and not the heater To check the heater and thermal switch directly the shelfs of the incubator and the back wall cover must be removed Unplug heater and measure its resistance If the resistance is correct check resistance between heater terminal and the heater sheath It must be an open circuit If the heater is good then check the thermal overload switch At room temperature it should be closed 0 ohms This switch should only open at 80 C and then close at 65 C If the heater and thermal switch are good then the problem is directed towards the heater wires in the harness If heater is defective contact White Westinghouse for replacement heater See page 7 3 Malfunctioning Power Supply PCB assembly The Power Supply PCB Assembly has the triac solid state AC voltage switch on it which supplies the power to heater This triac is told to operate when need be by the microprocessor There is another device known as Optoisolator which serves as the high low voltage isolator between the triac and the microprocessor When the i
18. below They are described as follows 1 FUSE This fuse is in line with the main power cord that comes into the incubator The rating of this fuse is printed above the fuse holder The physical size of this fuse is 5 MM x 20 MM 2 ALARM RELAY This Alarm Relay output is provided to the user for the purpose of remotely monitoring the incubator in case of a high or low temperature alarm condition This alarm relay will operate just as the audible alarm would The contact itself is an isolated form normally open normally closed dry contact This contact is to be used for low voltage class 2 connections only The contact rating is 24 volts 1 25 amps resistive Typical usages of the output are shown below NC LIGHT NO VOLTAGE SOURCE In this configuration the light will illuminate whenever the unit goes into an alarm condition High or Low NC VOLTAGE SOURCE In this configuration the light will go off in a high or low temperature alarm condition NOTE WIRING MUST CONFORM TO ALL LOCAL ELECTRICAL CODES 3 RS 232 OUTPUT Optional Kit P N 51200906 This output is used for two way communications between the incubator and a personal computer With the use of communications modem software program the user can record the temperature of the incubator at their selected time periods and store it in a file for use with a
19. by the Heater On indicator lamp on the front panel It should not be on continuously or even flashing Measure the voltage at U1 Pin 2 with respect 10 to TP2 It should be no less than 4 volts DC Measure the DC voltage across R4 since the incubator is not requesting heat there should be no current flowing through this resistor making the voltage drop equal to zero volts If the last two steps are not as stated then most likely the CPU board is bad and it will have to be replaced Switch the voltmeter to an AC Volts scale capable of reading 120 volts Measure the voltage between U1 Pin 4 and U1 Pin 6 It should be line voltage 110 VAC to 120 VAC If it is not most likely the Optoisolator is bad and the power supply board will have to be replaced Measure the voltage TB1 4 Orange wire and 1 6 Red wire It should be approximately 0 VAC If it is not then most likely the triac is bad and the power supply board will have to be replaced This second section will be to verify the heater command is correct from the microprocessor through the optoisolator and through the Triac when the incubator is requesting heat The steps in this section must be followed in progression Select a setpoint temperature at least 10 above what the actual temperature is The incubator should be requesting heat as indicated by the Heater On indicator lamp on the front panel It should be on continuously no
20. configured to the selected port The serial port is an IBM PC AT style port The cable that connects to it must end in a DB 25 25 pin male connector The cable is a one to one wiring format The pin assignments for the serial port are PIN SIGNAL DESCRIPTION 2 TXD Serial Transmitted Data 3 RXD Serial Received Data 7 GND Signal Ground O V TOP VIEW OF CONTROL PANEL 0038 1002 J304 1 BLACK 2 3 4 To J304 8 5232 Piot Assy PCB 815 CPU 5 PCB Washer 34381002 Control _ k lt 7 Washer N t Nut N Z Spacer Screw SUGGESTED MOLINTING Setting up the Incubator for Communications Your Incubator will require the selection of 3 parameters for communications A Baud Rate This is the speed of communication between the incubator and computer Whatever is selected for the incubator must also be selected in the communication software that is planned to be used B Status Update Time Interval This is the time between information being sent from the incubator to the computer C Status Display Type Selection of format of data that is sent to your computer Please read the following steps before performing any of them It will allow you to familiarize yourself with the procedure and to determine the values you want beforehand Please note n
21. ed in PRECISION formal sales contracts shall be controlling and any changes must be in writing and signed by an authorized executive of PRECISION All defective components will be replaced without charge one 1 year from the date of delivery There will be no charge for labor if the apparatus is returned to the factory prepaid Conditions and qualifications of the warranty statement shall prevail at all times 20
22. gh Limit controls are adjusted properly If the limit controls are set too close or beyond the operating temperature the incubator may be consistently going into alarm This will result in erratic temperature control First the symptoms and possible causes will be listed for quick reference Later the remedies will be suggested WARNING HAZARDOUS HIGH VOLTAGE CONDITIONS EXIST INSIDE THE CONTROL PANEL UNPLUG LINE CORD AND TURN OFF LINE SWITCH BEFORE REMOVING THE COVER ONLY QUALIFIED ELECTRICAL INSTRUMENT PERSONNEL ARE AUTHORIZED TO PERFORM TROUBLESHOOTING AND OR SERVICING SYMPTOMS AND POSSIBLE CAUSES Freeze up or gradual drop in chamber temperature No air circulation in chamber inoperative fan see Remedy 1 Heater see Remedy 2 Power Supply PCB Assembly see Remedy 3 RTD Temperature Probe see Remedy 3 Step D and or Remedy 4 Temperature variations at set point poor control Excessive ambient temperature variations see Remedy 10 Compressor Relay failure see Remedy 12 No air circulation in chamber inoperative fan see Remedy 1 RTD Temperature Probe Location see Remedy 5 Ice buildup on evaporator coils see paragraph Defrosting RTD Temperature probe see Remedy 3 Step D and or Remedy 4 Power Supply PCB Assembly see Remedy 3 Does not reach a high set point temperature No air circulation in chamber inoperative fan see Remedy 1 Low line voltage less than 110V see Remedy
23. intenance requirements are important for safe and satisfactory operation The unit should be used for its intended application alterations or modifications will VOID THE WARRANTY WARNING AS A ROUTINE LABORATORY PRECAUTION ALWAYS WEAR SAFETY GLASSES WHEN WORKING WITH THIS APPARATUS This product is not intended nor can it be used as a Sterile or patient connected device In addition this apparatus is not designed for use in Class Il or III locations as defined by the National Electrical Code UNPACKING AND DAMAGE Save all packing material until unit is put into service This merchandise was carefully packed and thoroughly inspected before leaving our factory Responsibility for safe delivery was assumed by the carrier upon acceptance of the shipment therefore claims for loss or damage sustained in transit must be made upon the carrier by the recipient as follows 1 Visible Loss or Damage Note any external evidence of loss or damage on the freight bill or express receipt and have it signed by the carrier s agent Failure to adequately describe such external evidence of loss or damage may result in the carrier s refusing to honor your damage claim The form required to file such claim will be supplied by the carrier 2 Concealed Loss or Damage Concealed loss or damage means loss or damage which does not become apparent until the merchandise has been unpacked and inspected Should either occur make a written req
24. ncubator starts experiencing temperature problems and or variations due to known controller malfunctions these two components become prime suspects The reason being they are under higher operating stress than other components If the incubator starts experiencing temperature problems such as no heat constant heat or creeping upward heat then follow the troubleshooting instructions below These instructions require the use of a voltmeter being able to measure DC and AC voltages and preferably a digital voltmeter WARNING FOLLOWING TROUBLESHOOTING INSTRUCTIONS REQUIRE THAT POWER BE ON ONLY QUALIFIED SERVICE PERSONNEL SHOULD PERFORM THESE PROCEDURES A B Remove the control cover and familiarize yourself with the power supply assembly 34394901 Locate the Triac Q2 the Opto isolator U1 resistor R4 Also locate the test point 2 TP2 The first measurements will be DC voltage measurement so a DC scale of at least 10 volts should be selected Connect the negative lead to TP2 This is DC ground Also locate the terminal block TB1 This first section will be to verify the heater command is correct from the microprocessor through the optoisolator and through the Triac when the incubator is NOT requesting heat The steps in this section must be followed in progression Select a setpoint temperature at least 10 below what the actual temperature is The incubator should not be requesting heat as indicated
25. ng Excessive frost buildup on the evaporator coil located on the lower rear wall will also affect temperature uniformity WARNING SAFETY PRECAUTIONS 1 DO NOT PLACE EXPLOSIVE COMBUSTIBLE OR FLAMMABLE MATERIALS IN THE CHAMBER 2 DO NOT PLACE SEALED CONTAINERS IN THE CHAMBER SEALED CONTAINERS FILLED WITH MATERIALS DO NOT PROVIDE ROOM FOR EXPANSION AND CAN DEVELOP DANGEROUS VAPOR PRESSURE AS THE TEMPERATURE INCREASES 3 AVOID SPILLAGE OF LIQUIDS WITHIN THE CHAMBER 4 DO NOT EVAPORATE NOXIOUS FUMES CAUTION DO NOT STORE CONTAINERS FILLED WITH ACIDIC OR CAUSTIC SOLUTIONS AS VAPORS FROM THESE MATERIALS WILL ATTACK THE EVAPORATOR AND VOID THE WARRANTY Power up by depressing the ON OFF switch Immediately after turning on power all the segments of the display and all of the indicators will be on After one second the display will show the actual temperature and the actual temperature indicator light will be lit If the setpoint temperature is greater than the actual temperature then the heater on lamp will be on or start to flash If it flashes then the actual temperature is near setpoint temperature To display any TEMPERATURE VALUE With the use of either the SET TEMP CAL key or the HIGH LOW LIMIT key any temperature value can be displayed To view the set temperature press the SET TEMP CAL key once The green indicator for the set temperature will light If no other keys are pressed
26. nit at Allow the unit to run for at least an hour after it reaches the setpoint before you perform the calibration NOTE IF POSSIBLE PLACE THE THERMOMETER INTO A LIQUID FOR STABILITY To perform calibration press the SET TEMP CAL twice The green calibration indicator should be lit Then press either the UP or DOWN arrow keys to make the display match the noted thermometer reading After the satisfied display is achieved press the ENTER key The display will then return to showing the newly calibrated actual temperature To change the HIGH TEMPERATURE ALARM SETPOINT After selecting a setpoint temperature the HIGH TEMPERATURE ALARM SETPOINT automatically defaults to 1 higher than the setpoint that was entered This 1 default difference can be overridden if the user wishes to The following paragraph describes this Press the HIGH LOW LIMIT key once The green High Temperature alarm Set Point indicator should be lit Use the UP or DOWN arrow keys to select your limit value Then press the ENTER key If the HIGH LIMIT value you have selected is below the operating SETPOINT TEMPERATURE the incubators alarm will activate To change the LOW TEMPERATURE ALARM SETPOINT After selecting a setpoint temperature the LOW TEMPERATURE SETPOINT automatically defaults to 1 lower than the setpoint that was entered This 1 default difference can be overridden if the user wishes to The next paragraph describes this Press the
27. r me tation 5 WS bea PRION cb 6 E 7 8 MroubleshoounG tential 8 died lett 12 Installation and Operation of the 5232 eee 13 eee 17 19 20 INTRODUCTION Your satisfaction and safety are important to PRECISION and a complete understanding of this unit is necessary to attain these objectives As the user of this apparatus you have the responsibility to understand the proper function and operational characteristics of your incubator This instruction manual should be thoroughly read and all operators given adequate training before attempting to place this unit in service Awareness of the stated cautions and warnings and compliance with recommended operating parameters together with ma
28. strumentation port for the user to insert sensor wires external meter leads etc into the chamber The rubber plug provided must always be used in this port to insure the uniformity specifications An extra plug is supplied for the user s convenience Be sure to seal any gaps around the wire s going through the plug INSTALLATION Location To assure proper ventilation allow a minimum of 4 of clearance between the rear top and sides of the incubator and adjacent walls If two or more incubators are positioned side by side allow a minimum of 8 between cabinets Adjust the front leveling feet of the incubator so that the front is higher than the rear This will assist in door closing Choose a site free from rapidly changing ambient temperature conditions CAUTION THE INCUBATOR SHOULD NOT BE OPERATED IN AN ENVIRONMENT WHERE THE AMBIENT TEMPERATURE EXCEEDS 90 F AS THE COMPRESSOR THERMO OVERLOAD WILL BE TRIPPED AND WILL RESULT IN A WIDE BAND CONTROL CYCLE OF APPROXIMATELY 4 SUCH CYCLING SHOULD BE MISINTERPRETED AS A MALFUNCTION OF THE ELECTRONIC CONTROLS Radiators air conditioning outlets other ventilating system outlets and drafts can affect the operation of the incubator by a sudden inrush of air that is at a temperature different than operating conditions WARNING FOR PERSONAL SAFETY THIS APPARATUS MUST BE PROPERLY GROUNDED The power cord of this instrument is equipped with a three prong grounding
29. t flashing Measure the voltage at U1 Pin 2 with respect to TP2 It should be no greater than 4 volts DC Measure the DC voltage across R4 since the incubator is requesting heat there should be current flowing through this resistor making the voltage drop equal to 3 volts 0 5 volts D If the last two steps are not as stated then most likely the CPU board is bad and it will have to be replaced Switch the voltmeter to an AC Volts scale capable of reading 120 Volts Measure the voltage between U1 Pin 4 and U1 Pin 6 It should be less than 1 VAC If it is not most likely the optoisolator is bad and the power supply board will have to be replaced Measure the voltage between TB1 4 Orange wire and TB1 6 Red wire It should be line voltage 110 VAC to 120 VAC If it is not then most likely the triac is bad The power supply board will have to be replaced Measure RTD temperature probe resistance at the connector after unplugging it from plug J302 The resistance between contacts at various temperatures are as follows TEMPERATURE RESISTANCE 0 C 100 OHMS 20 C 108 OHMS 37 C 114 OHMS 50 C 119 OHMS NOTE ONLY 2 OF THE 3 CONNECTORS POSITIONS ARE USED 4 Malfunctioning RTD Temperature probe The Control Board can detect if the temperature probe or the connection of the temperature probe to the circuit board is OPEN or SHORTED These two conditions are shown on the display as follows ISP
30. t reach 50 C Compressor must be discharged and recharged correctly 12 The circuit design calls for continuous compressor operation If compressor cycles On Off it is an indication that the starting relay is overriding the control circuit This may be the result of excessive 90 F ambient temperature adjacent to the compressor excess dirt on the compressor or a relay malfunction Provide additional wall clearance and or circulation around the unit clean compressor or contact White Westinghouse for service See page 8 MAINTENANCE The design of the incubator is such that periodic maintenance is kept to a minimum No lubrication is required The following paragraphs cover the few minor procedures necessary for continuous operation WARNING TURN OFF POWER SWITCH AND UNPLUG LINE CORD TO INCUBATOR If the chamber needs to be cleaned a mild soap and water solution or bicarbonate of soda 1tbsp gallon of water is recommended When the incubator is used frequently below ambient temperatures or in any manner that increases moisture buildup within the chamber an appropriate defrosting schedule must be determined Defrosting is accomplished by turning the incubator off for 24 hours Moisture will collect in the drip pan beneath the incubator WARNING 1 OVERCHARGING A REFRIGERATION SYSTEM CAN CAUSE EXCESSIVE SYSTEM PRESSURE AND IT CAN BE DANGEROUS 2 THE COMPRESSOR TERMINAL PROTECTIVE COVER MUST BE PROPERLY IN PLACE
31. ts One 1 COM Port Selected by user Format ASCII Using the Communications The incubator transmits information on its RS232 Port as long as the status update time interval is not 0 0 If you start your communication software with the incubator on most likely you will see the error s messages as follows ERR VALUE IS READ ONLY ILLEGAL COMMAND Wait for the Status Update Time duration you selected to complete and the communications will correct itself Besides having the incubator transmit information in one of the three formats the user can monitor other values or even change some of these from their computer The following table lists the available commands for monitoring or controlling your unit View Actual Temperature Degrees Setpoint Temperature Change Command Read Only Degrees T10 thru T50 RO thru R5 Display the Alarm Status S0 thru S8 Current Rev Read Only 0 2 DO thru D2 Read Only To View Data If Status Update Time is 0 0 no data will automatically be displayed To view data within a particular command code type that command code followed by the question mark symbol and then ENTER Return Example To view Setpoint Temperature type T lt CR gt Change Data To change the value within the command type the command code followed by the new value and ENTER Return Example 1 To change Setpoint Temperature to 25 0 C type T
32. uest for inspection by carrier s agent within fifteen 15 days of the delivery date then file a claim with the carrier since the damage is the carrier s responsibility If you follow the above instructions carefully we will guarantee our full support of your claim to be compensated for loss or concealed damage DO NOT FOR ANY REASON RETURN THIS UNIT WITHOUT FIRST OBTAINING AUTHORIZATION In any correspondence to PRECISION please supply the nameplate data including catalog number and serial number GENERAL INFORMATION The incubator is commonly referred to as the standard Model 815 These instructions encompass the models listed below with their specific electrical characteristics MODEL 815 51221106 21227105 115 60 7 0 230 60 3 5 CATALOG 51220105 BE CONVERTED FOR OPERATION ON 200V OR 240V BY CHANGING INPUT CONNECTIONS TO THE AUTOTRANSFORMERS SEE WIRING DIAGRAM ON PAGE 17 The 815 Low Temperature Incubator has been designed to provide the ultimate in temperature control The user is assured of dependable and precise performance through the use of microprocessor technology in the temperature control circuitry The Model 815 Incubator is operable in the range of 10 to 50 C These temperature ranges will meet a wide variety of applications such as BOD determination general incubation and as well as the preservation of critical materials PERFORMANCE DATA Heat Up Time From 1
33. within 5 seconds the display will automatically return to the actual temperature To view the calibrate temperature press the SET TEMP CAL twice while the display is showing the actual temperature The same sequence of key operation is true for the use of the HIGH LOW LIMIT key To change the SETPOINT TEMPERATURE Press the SET TEMP CAL key once Then press the UP or DOWN arrow key until the desired temperature is displayed When continuously pressing either the UP or DOWN keys the display will begin to change rapidly With a little practice one will become accustomed to this After the desired set temperature is achieved then press the ENTER key The display will then return to showing the actual temperature If the ENTER key is not pressed the expected new set temperature will not be accepted and the incubator will control at the previous set temperature To CALIBRATE the INCUBATOR The incubator is calibrated at the factory for use over a wide range of temperatures Due to the slight non linearities in the control system it may be necessary to make the display match a calibrated thermometer s reading even though the difference might be only a few tenth s of a degree The CALIBRATE key should be used ONLY to match a stable incubator s actual temperature to the calibrated thermometer Place a calibrated thermometer or the probe of one at the center of the third shelf of the incubator Select the SETPOINT you wish to run the u
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