Installation & Service Manual PARALLEL
Contents
1. EA PA PA SAS CA DA wo amp S EA RA PA EA SK CASES COOLERS Pe E P E LE E ATESTE S PS 1 EVEN HOUR MODULE 2 EVEN HALF HOUR MODULE 3 ODD HOUR MODULE 4 ODD HALF HOUR MODULE 5 EVEN HOUR MODULE 6 EVEN HALF HOUR MODULE 7 ODD HOUR MODULE 8 ODD HALF HOUR MODULE June 2007 Multi Circuit Time Clock Module 14 3 PARALLEL COMPRESSORS Installation amp Service Manual amp ENVIROGUARD SECTION 15 Refrigeration Circuits Electric Time Off or Gas Defrost TIME OFF OR ELECTRIC DEFROST CIRCUITS GAS DEFROST CIRCUITS EVAPORATOR EVAPORATOR EVAPORATOR EVAPORATOR EVAPORATOR EVAPORATOR TTD TTD TD TD TTD Qi quii Li qtii 5 qiii 5 qii d TTD ID 4 ud 6 d TTD 69 09 o ie FIELD PIPING FACTORY PIPING By a e ha Ly KE 3 3 LIQUID 8p __59 _____59 SURGEN MANIFOLD 20 SUPPLY MANIFOLD 24 4 E al 50 30 50 50 lt 6 5 0 SUCTION MANIFOLD Time Off or Electric Defrost Circuits The following component arrangements are associated with cases or unit cooler coils equipped with electric defrost heaters air or timed off cycle defrost The purpose of these arrangements is to stop the flow of refrigerant through the evap2. s n A S NV3 ANOO 553 2 Sd S MOTTSA 5 SLOVLNO HOLIAAS A134 VS joHINOO uoswas C 3unss3ud 9 91 z S SINGO 3unssaud SSNVHO FNN MOTISA 1509490 TOXLNOO 31 15 ANOS NI INIOd 1OH1NOO zm 3n18 P Alvis anes T 1 j yovga NIINIOd LE HOLOWLNOO NO HOLIMS qasn 39018 IVNIAH3 L SNOILO3NNOO 11 1 Siena E E TT q3sn ASVYOUNVHO 440 NO ania M SHOLONGNOD H3ddCO 009 ISN LSNW M 5 5 INaMdino3 y uoissiuuJed uoe1eu uwous o pesn Jo eq jou pue 6uueeurBue 10 eouepyuoo ui penssi 1 1 siu u u swej uonejodioo Je AL FO LON R 22 Low Temperature Demand Cooling 21 5 June 2007 PARALLEL COMPRESSORS TYLER REFRIGERATION amp ENVIROGUARD le Unit Compressor Wiring TSK In ical Si T GION31OS NOILOGfNI MOTI3A JOHINOO 0
3. 36 ROA 37 Em f xe p 5 Umm s Pra N5MHB NSMGHP ae EN SENT Da 39 June 2007 Defrost Control Strategies 12 3 PARALLEL COMPRESSORS TYLER amp ENVIROGUARD REFRIGERATION CASE DATA ELECTRIC DEFROST TIME OFF DISCH EPR FAILSAFE TERM FAN FAILSAFE AIR SETTINGS DEF TIME TEMP CYCLE DEF TIME MODEL F R 22 R404A 2 Lum TEMPS TLD TLD 2 4 6 5m E m KI mmm mu xa sz z 52 Cres a nomma 2 or 2 4 2 2 4 2 2 32 36 M 8 6 2 N2P BUQ 33 43 56 6 28 nouma s ss 4 2 4 24 meun a aa ss 4 NNUMH 4 4 6 Wuewmom LO LL ALL APTN _ _ 2 NWE NEE NPWEE NPE BULK 35 PNSDSC 5 35 NRPIE 35 4 NB 5 PNP UL 3 4
4. MOTISA SLOVINOD HOLMS ALS AVS ALBAVE AGL 4 Hi uossaudWoo SLOVINOD SHOSNdS TJOHINOO 3unss3ud O 35NVHO aau AAOTI3A LSotidaq 1OHH1NOO ALVLS anos NI LNIOd TOHINOO ns jy NI LNIOd L 21 LL HOLOVINOO HO IOVINOO NO HOLMS XNY casn NIHA 3SVOXNVUO VSL 53575 sa MOTHA MOTHA ELZL 11 esn OY 19 uoissiuued USM 19 1Ip 5 BulyyAue pesn Jo peonpoidas eq jou Aew ui penssi 511 BUIMEIP SIU ui p so 5sIp UOPeW 241 sluBu Al elidoid uorejodioz uage 1 I L 3SILON SNNN SHOLONANOS H3ddOO 309 ISN 15 Si ANSINGPRS June 2007 21 6 R 22 Low Temperature Demand Cooling
5. ERNIE NOILONS 48 431000 B ans YIOAYASSY aisd 3AIVA MO3HO ABLSAS 3IvHuvdas Aa yaya ssy19 JAVA O Tyg WIV103Y 30945 319 16 1SOHJ3Q OIH1O313 430 INIL 0 M ONIdid GINO L ON NOISS3HdIWOS JOVLS HLIM WALSAS seH Y YNSHLOFd alva Parallel System w NC 2 amp Heat Recovery 17 7 June 2007 PARALLEL COMPRESSORS amp ENVIROGUARD TYLER REFRIGERATION Hot Water Piping Methods SPACE HEAT RECLAIM 3 WAY VALVE OPT LPR gt COND METHOD 1 BYPASS VALVE OIL SEP OOOO WATER COMPRESSORS FULL PARALLEL ON HOT WATER OR SPACE HEAT RECLAIM 3 WAY VALVE METHOD 2 OIL SEP OO sor COMPRESSORS WATER FULL PARALLEL ON HOT WATER RECLAIM W 3 WAY VALVE COND METHOD 3 DIFFERENTIAL BYPASS VALVE OIL SEP OOOO wor WATER COMPRESSORS FULL PARALLEL ON HOT WATER RECLAIM W BYPASS VALVE DI
6. time period set on the multi circuit time clock or computer controller is called the Failsafe time period it includes both the defrost and the drip down time However if at any time during this drip down period a fixture s temperature drops 10 F or more the defrost will be reinitiated Although this is true for all cases it is most prevalent in the N6F L NFJGCX P5FG and P5FGN cases It will continue until either temperature termination or Failsafe time from the initial defrost termination passes 15 2 Refrigeration Circuits June 2007 PARALLEL COMPRESSORS Installation amp Service Manual amp ENVIROGUARD Refrigeration Circuits Piping Diagram EVAPORATOR EVAPORATOR EVAPORATOR PARALLEL SYSTEM WITH HHfb HtHb SINGLE STAGE COMPRESSION ar NC 1 LIQUID PIPING a Y 6 nu LATENT GAS DEFROST I I SINGLE CONDENSER PIPING SPACE HEAT RECLAIM HHP CONDENSER BALL SIGHT VALVE GLASS DRIER SUCTION FILTER DIFFERENTIAL PRESSURE R REGULATORY RELIEF VALVE 400 PSIG N O RECEIVER O SHO S BALL VALVE BALL VALVE IPR Gas Defrost Circuits Hot gas from the receiver is used to defrost cases by reversing the flow through the evaporator coil This flow reversal must be done by devices added to the parallel rack piping including the hot gas manifold which is run parallel to the suction and liquid manifolds System pressure must be directed to the portion of the system that is
7. DEF TIME MODEL F R 22 R404A DAY an TEMPS a mE NFX NFSX NFSGX 22 50 1 36 NFNX NFNGX NFBX NFBGX NFEX NFGEX NFJCX NFJGCX 38 NFJECX NFJGECX NFWX NFWGX 38 50 NFWEX 325 o UU C eae IPFT z 3 9 4 PANG DEL s 2 Fwrorpowg a sa s 9 NG MEAT 24 so 2 4 5 PNOPSE GUL 4 49 e 3 24 39 4 6 39 9 5 2 PING s so 27 6 99 2 so T s gt r ss 9 6 3 59 sms 49 amp a lt KET sn RCCG mSEROPTZ 328 35 46 f a lll RISER OPT 1 80 egre fase amp nae a 8 s gt s 49 amp s 2 ELIT SSE SEE EI DEC E 325 38 5 6 3 5 5 cmm E IE Uo SERO ICM UE bosser per S
8. REFRIGERATION A Mechanical Oil Pressure Safety Switch P45 COPELAND COMPRESSORS 120 SECONDS TIME DELAY CUT IN 12 to 14 psig CUT OUT 7 to 9 psig SENTRONIC CONTROLS 120 SECONDS TIME DELAY CUT IN 12 to 14 psig CUT OUT 7 to 9 psig CARLYLE COMPRESSORS 120 SECONDS TIME DELAY CUT IN 8 to 11 psig CUT OUT 4 to 8 psig Sentronic Copeland Only Pressure Failure Switch Wiring L1 12 13 Time Delay N C n Jumper Low Side Pressure Oil Pressure Switch 120V Dropping Resistor 7 240 P d j PODES T1 an 4D 6D 4R 6R Copeland Compressor Bodies have built in Time Delay Switches Current Relay Used on Copeland NR MR MD 2D 3D L1 L2 L3 Power Supply Connections T1 T2 T3 Compressor Motor Connections 18 6 Component Description amp Definitions June 2007 PARALLEL COMPRESSORS Installation amp Service Manual amp ENVIROGUARD Optional Sentronic Sentronic Electronic Oil Pressure Control NOTE Information in this section is based on Copeland Application Engineering Bulletin AE 1275 R8 The optional Sentronics oil pressure safety control utilizes an electronic pressure sensor and module to precisely measure oil pump differential pressure The main advantage of the Sentronic control is to eliminate traditional capillary tubes to measure oil pressure A secondary advantage is the use o
9. could trip Even though the compressor motor had cooled sufficiently for the internal inherent protector to automatically reset the compressor could not be started until the oil pressure safety control was manually reset Normally this is not a problem since the compressor if properly applied will seldom ever trip due to an internal inherent protector If this does happen the fact that the protector trip has occurred indicates that the system operation should be reviewed However on frozen food or other critical temperature applications where a product loss may occur due to a compressor shutdown over night or weekend it may be desirable to prevent the possible nuisance trip by means of a current sensing relay The PENN R10A current sensing relay has been developed for this purpose It is mounted on the load side of the contactor The relay senses by induction the full operating current of one phase of the motor It closes on a rise in load current above 14 amps and opens if the load current falls below 4 amps June 2007 Optional Sentronic 4 Electronic Oil Pressure Control 19 5 PARALLEL COMPRESSORS TYLER amp ENVIROGUARD REFRIGERATION Current Sentronic Previous Sentronic Me aby earn DIAGRAM 5A DIAGRAM 58 Both Diagrams 5A and 5B use a current relay C S When the current relay is not energized by motor current its Normally Open N O contact opens the circuit that powers the Sentronic to avoid a nuis
10. does not affect valve operation The valve outlet pressure acting on the bottom of the disc exerts a force in the closing direction This force is opposed by the adjustable spring force Thus by ier increasing the spring force the valve VALVE setting pressure at which the valve will y close is increased As long as the valve outlet pressure is greater than the valve pressure setting the valve will remain closed As the outlet pressure is reduced the valve will open and pass refrigerant vapor into the receiver Further reduction in outlet pressure will allow the valve to open to its rated position where the rated pressure drop will exist across the valve port An increase in the outlet pressure will cause the valve to throttle until the pressure setting is reduced The valve supplied with R404A systems has a range from 80 to 200 psi See page 9 1 for pressure setting requirements GAS BYPASS LINE BALL VALVE CHECK VALVE OPR OR A 9 RELIEF VALVE RECEIVER KH HO CHECK BALL BALL VALVE VALVE VALVE 18 4 Component Description amp Definitions June 2007 PARALLEL COMPRESSORS Installation amp Service Manual amp ENVIROGUARD CROT amp OPR Pressure Settings SETTING GR5168 GR5169 PSIG DEPTH DEPTH 9 16 a o j o un me mee se wu we 1 c 0 Changes 6 72 OPR 6 OPR 6 A 9 per turn 27 psig 50 130 15 5 psig 80 200 24 psi
11. in melting the accumulated frost from the evaporator The defrost gas being at a relatively cool temperature at the start of defrost reduces thermal stress on the piping thereby reducing the possibility of line breakage and loss of refrigerant The gas volume in the receiver is constantly being supplied from the compressor discharge line which maintains gas flow throughout the defrost cycle Receiver gas defrost is available for case lineups operated by a parallel compressor system Defrost is accomplished by using the cool saturated gas from the receiver at elevated pressures The compressor discharge gas is injected into the receiver As the discharge gas passes over the liquid in the receiver it is desuperheated This provides a positive pressure which helps maintain the flow of liquid to the refrigerated fixtures during defrost About 25 of the total load can be defrosted at one time and the remaining 75 of the load is needed as a heat source for the defrosting cases Receiver gas defrost is initiated by either a mechanical or electronic multi circuit time clock or computer controller These devices provide the proper sequence of defrosts Only one circuit is to be defrosted at a time if this is not adhered to the entire system may operate improperly Systems having a DDPR valve in the discharge line are to be set for a 20 psid differential across the valve This valve is necessary in cold ambient areas below 30 F because it ensures ad
12. more than one case and when all are closed the clock solenoid is reset again allowing each case to independently terminate based on its own needs When using an electronic controller with electric defrost the controller will still initiate the defrost based on time The sensors should still be placed in each case at the same location as our standard defrost termination thermostat Multiple sensors on the same defrost circuit should be used so that all cases are satisfied before terminating heat and restarting refrigeration The compromise is some danger of over defrosting if some cases have less frost loads than other on the same circuit The standard klixons must be kept in the circuit for U L requirements but changed to 70 F termination to act as a safety and prevent cross controlling In lieu of sensors the standard defrost klixons may be monitored by the computer controller to terminate defrost Gas Defrost When using a standard clock system with gas defrost the clock will initiate the defrost based on time and it will restart the refrigeration based on a fail safe time plus 5 minutes drain down time Defrost termination by thermostats at the display fixture will only close the gas supply solenoid at the compressor rack Termination thermostats at the display case or evaporators in a walk in cooler should be connected in parallel and wired for open on rise Once all thermostats are satisfied simultaneously flow to the fixtures will cea
13. or electronics to control their operation The compressor control panel contains all the necessary controls to operate the compressors properly The systems are designed to be used with remote condensers and optional heat recovery coils The systems utilize either a horizontal or vertical receiver tank Compressor horsepower sizes may be mixed for flexibility in capacity control Each system is individually designed for the specific needs of a given application It is unlikely that any two parallel system assemblies will be exactly alike A typical installation will usually consist of more than one parallel system A typical installation may use R 22 or R404A refrigerants Separate loads will be connected to the parallel rack at the liquid and suction line manifolds Temperature control at each individual circuit will be provided by an evaporator pressure regulator EPR valve in the suction lines or by thermostats with liquid or suction line solenoid valves Typical Piping amp Devices All Systems See page 17 3 for Piping Diagram for Parallel System with NC 2 amp Heat Recovery All liquid refrigerant flowing out to the case and cooler circuits must pass through a replaceable core filter drier 1 This filter and the filters in the suction line of each compressor are important in keeping installation debris from damaging the components in the system The drier element absorbs and holds moisture acids sludge and varnish wh
14. s to be defrosted This series of valves is explained in more detail on page 15 3 At a pre determined set time the time clock or computer controller will close a circuit s suction line valve to the compressor and open the hot gas supply valve to the circuit being defrosted The hot vapor rushes to the evaporator warming the coil The hot vapor is condensed into liquid in the evaporator and then the liquid is returned to the liquid manifold via a bypass around the expansion valve This liquid is in turn used as the refrigerant supply to other cases To make certain that the liquid flows from the evaporator of the defrosting fixture s a pressure differential is established between the compressor discharge pressure and the liquid header When defrost is initiated a DDPR valve throttles the normal hot vapor flow to the condenser An OLDR valve adjusted for a minimum of 20 pounds of differential located at the outlet to the receiver is also placed on the line to drop the pressure in the liquid manifold and ensure flow from the defrosting evaporator to the liquid manifold For proper adjustment see table on page 10 2 June 2007 Gas Defrosting 13 1 PARALLEL COMPRESSORS TYLER amp ENVIROGUARD REFRIGERATION Gas Defrosting Programming Gas defrosts are programmed to allow for a defrost period and a dripdown period clear time This type of defrost operation allows the problem areas in the case to completely clear withou
15. states It also provides a capacity reserve for hot weather protection The subcooler compressor operates at a high efficiency suction temperature of approximately 40 F Subcooler liquid supply is usually from a separate system The liquid line feed to the expansion side of the subcooler is controlled by two paralleled normally closed solenoid valves upstream of two expansion valves 1 The solenoid valves are sized at 75 and 25 of the total subcooling load The solenoid valves are thermostatically controlled 2 While the liquid inlet temperature is above 70 F the 75 solenoid is energized If the temperature falls below 70 F the 25 solenoid is energized The settings for the 25 thermostat are 55 F ON and 40 F OFF The subcooler compressor is controlled and protected by its own pressure control When liquid return temperature is above 55 F the subcooler will cycle ON and OFF between 55 F and 40 F See page 17 7 for Piping Diagram for NC 1 amp Mechanical Subcooling 17 6 Parallel System w NC 2 amp Heat Recovery June 2007 ENVIROGUARD PARALLEL COMPRESSORS Installation amp Service Manual Diagram for Parallel System with NC 1 amp Mechanical Subcoolin in Pi AAWA MO3HO IVNOLLdO ldid AHOLOV4 ONIdid 91915 H3SN3QNOO 3ATVA uaria NOILONS NOILONS AlddNs AHO LOV 91914 3ATVA
16. 5 e fs s N PSE 24 4 6 125 5 __ 27 38 50 8 1215 55 5040 nso Z 3 s 6 i215 55 5040 NG e 3 s 6 t 5 6040 Primary Fans Only 101 E2 with HEAT NENX NENGX s June 2007 Defrost Control Strategies 12 5 PARALLEL COMPRESSORS TYLER amp ENVIROGUARD REFRIGERATION A CASE DATA HOT GAS DEFROST DISCHARGE EPR DEFROSTS FAILSAFE AIR TEMP SETTINGS TIME TEMP CYCLE MODEL F R 22 F 30 38 49 32 55 NEDNLIMIF 4o Ice cream discharge air temperatures are 28 25 amp 8 F Frozen food discharge air temperatures are 20 15 10 5 amp 1 other discharge air temperatures are for medium temp applications Most low temperature cases can be set up for dual temp application frozen food medium temp Only the NTJCX amp NTJGCX cases can be set up for split temp application ice cream frozen food Termination thermostat bulbs are mounted on the bypass check valves around the expansion valves Multiple cases on a circuit using open on rise termination should be connected in parallel so that all are satisfied before stopping the gas flow An additional 5 minutes of drain down time should be allowed for after the failsafe time or added to the failsafe time if no
17. FFERENTIAL BYPASS VALVE METHOD 4 SPACE HEAT RECLAIM HOT 3 WAY VALVE WATER J 3 WAY gt COND OIL OIL COMPR COMPRESSORS COMPR SATELLITE COMPRESSOR S gt 10 HP ON HOT WATER RECLAIM W MAIN PARALLEL ON SPACE HEAT RECLAIM 17 8 Parallel System w NC 2 amp Heat Recovery June 2007 Installation amp Service Manual PARALLEL COMPRESSORS amp ENVIROGUARD Component Description amp Definitions Refrigeration Branch Circuit FIELD PIPING RACK PIPING MANIFOLD SIGHT 7 GLASS SUCTION BALL VALVE MANIFOLD Check Valve Symbol 4 Check Valve Locations REFRIGERATION CIRCUITS A Refrigeration Branch Circuit is a lineup or group of cases and or coolers connected to a common liquid line solenoid and common suction line The suction line may or may not be equipped with an EPR valve Parallel systems employ a number of spring loaded check valves of various sizes They allow gases or liquid flow in only one direction Three different spring loadings are used Normal Check Valves The spring above the valve disc assures positive return and seating Applications 1 In cases around the expansion valves and liquid line solenoid valves to provide reverse flow of liquid during gas defrost 2 At the inlet and outlet of the heat recovery coil Three are provided with the unit for field installation June 2007 Component Description amp Definit
18. PARALLEL COMPRESSORS Installation amp Service Manual amp ENVIROGUARD Defrost Control Strategies Temperature termination for all hot gas and electric defrost equipment is recommended with a termination sensing device at each fixture or coil Frost build up on coils varies depending on loading traffic and ambient temperatures consequently the required defrost time will also vary If defrost termination is not sensed at each coil there is a risk of other coils in the line up not completely defrosting This could cause icing over defrosting and or product quality problems Electric Defrost On all TYLER cases except the N6F L multi shelf freezers electric defrost termination can be done with the current sensing relay in our defrost panel Therefore no control wires are required between these cases and the compressor systems helping reduce installation costs Each case is independently terminated from the electric heat source by an inline klixon thermostat which opens on rise When the last heater shuts off the lack of current deactivates the current relay and initiates refrigeration This time tested method assures each case gets defrosted but prevents over defrosting by getting the refrigeration back on quickly The N6F L multi shelf freezer cases have defrost contactors located at the case and these have an auxiliary contact that closes when the termination thermostat de energizes the contactor These contacts are wired in series if
19. alize the whole system Because the lower the suction pressure at which a compressor is operated the less efficient it is The entire system would have to operate at this lower suction pressure By adding a companion one or more compressors operate at this lower efficiency rate while the other compressor s run at peak efficiency A companion compressor s suction line runs directly to the meat or deli cases A 2 pound check valve connection to the suction manifold allows the adjacent parallels to help pull down the meat deli cases temperature immediately after defrost If there were sufficient meat deli cases to warrant it the boosters could be on a separate parallel system Ice cream case companion compressors on low temp systems work similarly The normal low temp frozen food cases are at 20 to 25 F while the companion operates the ice cream cases at 35 F The parallel compressors on the frozen food system assist the booster in rapid temperature pulldown after defrost through the 2 pound check valve connection Companion Compressor Protection All companion compressors are equipped with a 2 minute delay to protect against short cycling When a companion compressor is applied to a gas defrost system an additional time delay relay is used to lock the compressor out after a defrost for a few additional minutes This allows the companion suction line to cool preventing possible liquid slugging and or thermal cutout because of high suction li
20. all the Module 1 When using the bracket above the oil pump use two 10 32 pan head screws with washers The maximum screw length is 265 plus bracket thickness CAUTION Do not use mounting screws that are too long Screws over 265 is length could damage the circuit board 2 Plug the cable from the module into the end of the sensor Care should be taken not to wrap the cable around a current carrying conductor 3 Hi Potting Copeland hi pots the module as part of final processing If additional hi potting is required it is recommended it be limited to one time only CAUTION Excessive hi potting can cause damage to the Sentronic module Electrostatic Painting Static electricity discharges from electrostatic painting can damage the Sentronic module It is recommended that the module not be mounted until such painting is complete Sentronic Troubleshooting Checking the Sensor Unplug the sensor and start the compressor Simultaneously measure the oil pump differential pressure Monitor the two terminals at the back of the sensor with an ohmmeter or continuity measuring set If the differential pressure is below 7 9 psid the sensor circuit should be open infinite resistance or no continuity If the pressure is above 12 14 psid the sensor circuit should be closed Checking the Module Shut off the compressor Unplug the sensor Verify the module is powered 230 volts or 115 across the 230 volt terminal and L on the control St
21. ance trip Diagram 5B shows the circuit used with the older model Sentronic An external control relay R is required to maintain power to the module in the event of an oil pressure safety trip since the module requires power to reset When the module is tripped on low oil pressure relay R is not energized and the relay R Normally Closed N C contact provides a voltage path to the module The circuit of Diagram 5A uses the new Sentronic The current relay operates in the same manner as in Diagram 5B but the oil pressure switch requires no power to reset so it needs no external relay to provide a reset power path NOTE On some 550 volt motor compressors it may be necessary to loop the current carrying wire so that it passes through the current sensing relay twice in order to increase the metered amperage to close the relay contacts Using a Separate Control Voltage with the The Current Sentronic New Sentronic LI LELY Diagram 6 shows how the current Sentronic might be used with a voltage on its S PD T contact that is different from the voltage that supplies its power Any A C voltage up to and including 240V might be used To use the Sentronic contact S PD T for a separate voltage remove the jumper between terminals 2 and M In this diagram the separate control voltage is supplied by LL1 and LL2 The separate voltage powers the v PRESSOR CONTACTOR compres
22. art the compressor with the sensor unplugged After 120 seconds plus an additional 15 seconds the contact between the L M terminals should open and shut off the compressor If not the timing circuit is defective and the module must be replaced With the module off on oil pressure press the reset If there is power to the module the contactor should close and start the compressor Electrical Connection Instructions CAUTION Damage to the Sentronic module will result if the M terminal of the Sentronic is connected to ground or directly to line voltage NOTE When changing components or making any kind of electrical alterations to any installation existing or new all ground connections must be specifically checked to make sure they are secure If there is any doubt about component or system grounding the local electrical inspector should be consulted The electrical connection diagrams included in this section are intended to represent the most common Sentronic application control circuits The system manufacturer should be consulted when more complex circuits are encountered June 2007 Optional Sentronic Electronic Oil Pressure Control 19 3 PARALLEL COMPRESSORS TYLER amp ENVIROGUARD REFRIGERATION Standard Control Circuits Current Sentronic Previous Sentranic DIAGRAM 3A DIAGRAM Both Diagrams 3A new Sentronic and 3B previous Sentronic show typical wiring connections and the similarity of Sentronic an
23. building A diverting valve 9 redirects hot gas to the HR coil 10 when heat is demanded by the Environmental Control Panel thermostat The Heat Recovery HR coil is optionally equipped with an inlet Pressure Regulator IPR on systems with Nature s Cooling NC 2 or NC 3 The IPR valve is standard on NC 2 systems The valve raises the system pressure during heat recovery to get more heat out of the discharge gas In most other systems liquid from the remote condenser returns directly to the receiver Natural subcooling is diminished since the liquid mixes in the receiver and warms to some extent in the machine room NC 2 preserves the naturally cooled liquid s temperature by bypassing the receiver when advantageous to do so The bypass line is operated by a liquid temperature sensing thermostat 11 When liquid returning from the remote condenser rises to 70 F the valve closes The liquid then flows directly into the receiver When outside temperature drops the condenser fans begin shutting off because they are set on a temperature sensing thermostat When the temperatures fall pressure in the system also drops However the pressure inside the receiver is allowed to fall only so far the minimum allowable pressure is the point where system performance will be hurt The receiver pressure is kept from falling below this minimum point by an Outlet Pressure Regulator OPR valve 12 located in a gas bypass line run from the compressor disc
24. compressor discharge temperatures Return gas temperatures must not exceed 65 F Suction lines should be well insulated to reduce suction line heat gain To DEMAND COOLING CONTROL CONTROL g CIRCUIT MODULE i INJECTION M VALVE ELECTRICAL CONTROL LINE REFRIGERANT INJECTION LINE l DEMAND COOLING SENSOR AND SENSOR LINES LIQUID LINE FILTER DRIER INJECTION SOLENOID VALVE SUCTION LINE FILTER FIGURE 2 DEMAND COOLING SYSTEM DIAGRAM REPRINTED FROM COPELAND ENGINEERING BULLETIN AE 1287 June 2007 R 22 Low Temperature Demand Cooling 21 3 PARALLEL COMPRESSORS TYLER amp ENVIROGUARD REFRIGERATION Typical Parallel Wiring Application COMPRESSOR CONTROL CIRCUIT 208 230 VAC 60Hz CUSTOMER PWR SUPPLY USE MINIMUM 60 C 140 F COPPER TERMINAL BLocks LI Le crouno Luc SONDUCTORS ONLY OQ Oy CIRCUIT COMPRESSOR PILOT 2M BRKR Q CIRCUIT BREAKER Q BLU RED OFF A COMPRESSOR OIL FAIL ALARM RELAY 124 145 M pasmi DEMAND A ees EL o COMPRESSOR m W COMPRESSOR IND LIGHT INJECTION C 9 SOLENOID YEL FAN AUX2 CC COMPRESSOR NO C HEAD FAN L1 L2 21 4 R 22 Low Temperature Demand Cooling June 2007 8 ENVIROGUARD PARALLEL COMPRESSORS Installation amp Service Manual Single Unit Compressor Wiring TFC TED T IOS
25. ction side of the system is automatically closed through the valve June 2007 PARALLEL COMPRESSORS Installation amp Service Manual amp ENVIROGUARD Suction Stop Valve This normally open valve is operated from the multi circuit time clock or computer controller During the refrigeration cycle the valve is de energized and remains open The valve makes use of the system s low pressure to hold itself open by porting the top of the piston to suction manifold When defrost is initiated the solenoid valve is energized IN directing system high pressure to the top of lt the piston closing the valve HIGH PRESSURE INLET Liquid Line Solenoid A normally closed valve in the de energized position must be energized to open during the refrigeration cycle It may be used for circuits on electric or timed off defrost or can be used with thermostats SETA Rr 9 The heat recovery HR coil is optionally equipped with an inlet pressure regulator IPR on systems which employ Nature s Cooling NC 2 The IPR valve is standard on NC 2 systems The valve raises the system pressure during HR to get more heat out of the coil Inlet Pressure Regulator IPR lt IPR REMOVE CAP ADJUST OR A 8 BELLOWS BUS fT HEAT RECOVERY As shown the outlet pressure from the heat BEAT recover coil is exerted on the underside of the bellows and the top of the seat disc at t
26. d Sentronic oil pressure switches used on three phase motor compressors Sentronics are energized when they are connected to a voltage source In both diagrams 3A and 3B if the compressor controlling and overload devices are closed the compressor starts and at the same time a circuit is made from one side of the power to incoming lines to the terminal The terminal is one side of the L M N C contact of the Sentronic module The M side of the N C contact is usually connected to the compressor contac tor coil The circuit for the electronic module power is completed by the connection of the 230 240 or 115 120 volt terminal to the other side of the incoming power line The electronic two minute timing circuit operates whenever voltage is applied to a Sentronic and it has not tripped The timing will be iterrupted when oil pressure rises above 12 14 psid and closes the Sentronic sensor Should oil pressure not build up suffi ciently for 120 seconds the electronic delay will time out open its L M contact break the control circuit and de energize the compressor contactor to stop compressor operation While the compressor is running if the compressor net oil pressure falls below the cut out setting of the sensor while operating and does not re establish sufficient pressure within an acceptable time the time delay circuit will open the L M contacts stopping compressor operation Once the oil pressure switch has tripped i
27. e oil control module Should the oil pressure fall below 9 psid 2 psid for a period of two minutes the module will open the control circuit and shut the compressor down The two minute time delay serves to avoid shutdown during short fluctuation in oil pressure on start up Oil pressure can be approximately measured in the field Oil pumps will still be furnished with a Schrader valve for the discharge high pressure port To measure oil pressure subtract crankcase pressure from discharge oil pressure If the oil pressure switch trips it is a warning that the system has been without proper lubrication for a period of two minutes Repeated trips of the oil pressure safety control are a Clear indication that something in the system requires immediate remedial action On a well designed system there should be no trips of the oil pressure safety control Repeated trips should never be accepted as a normal part of the system operation June 2007 Optional Sentronic Electronic Oil Pressure Control 19 1 PARALLEL COMPRESSORS amp ENVIROGUARD TYLER Once the oil pressure control has tripped it must be manually reset to restore the system to operation If the compressor net oil pressure falls below the cut out setting of the control during operation and does not re establish sufficient pressure within 120 seconds the time delay circuit will open the L M contacts and stop compressor operation IMPORTANT If a power interruption occurs af
28. equate gas flow during defrost to the defrosting fixtures Control Strategy NC 1 Latent Heat Receiver Gas Defrost 1 Remote Condenser Fans are controlled by a pressure control set for the minimum target pressure corresponding to 88 89 F saturation temperature This ensures adequate defrost during cold ambient temperatures m Outlet Pressure Regulator OPR Valve is set for the target pressure corresponding to 86 87 F saturation temperature w Inlet Pressure Regulator IPR Valve is set for the target pressure corresponding to 94 95 F saturation temperature The OLDR Liquid Solenoid Valve is energized during defrost to create a pressure differential Refer to table on page 10 2 for proper adjustment June 2007 Receiver Gas Defrost 16 1 REFRIGERATION TYLER TWNOILdO Diagram in for Parallel System with Demand Cooling Mechanical Subcooling amp Latent Gas Defrost PARALLEL COMPRESSORS amp ENVIROGUARD Pi ddl TIVE AAWA TIVE gt 3ATVA 38189 Tiva MO3HO gt lt CANN SSW 150 r IVISL HJIOOO ans 3ATVAMO3HO A VA ETE ld NOILONS S C IN3LSAS 3ivuvd3s Ad ms Ss
29. eration the following must be done 1 The number of defrosts for a specific circuit is set by inserting the black trippers into the 24 hour time dial 1 for each defrost Each of the 2 hour minute dials must be set for the length of the defrost period failsafe MOTOR MODULE TERMINAL BLOCK HEXAGONAL NUT MOTOR MODULE As the 2 hour dial rotates so do the 24 hour dials The 2 hour dial makes a complete rotation every 2 hours Defrosts will start when a tripper is reached on the 24 hour dial and will continue for the time period set on the 2 hour time dial Setting the Multi Circuit Time Clock Setting the defrost times on the clock is a simple procedure Follow these precautions PRECAUTIONS Do not set the program timer with the circuit energized De energize the control circuit to prevent personnel injury or inadvertently tripping too many defrosts at one time Do not use excessive force when turning the minute dial levers Rotate the dial in a counter clockwise direction Setting 1 Insert black plastic trippers into the 24 hour time clock at the times of day the defrosts indicated by the black numbers on the white dial are to occur Set the failsafe time on the 2 hour clock by rotating the copper termination lever so the pointer indicates the desired time period Set clock to the correct time of day indicated by the white numbers on the smaller black wheel to the left of each 24 hour module
30. f an electronic clock in the two minute time out circuit Because of these two advantages the Sentronic control will improve the overall reliability of the refrigeration system The Sentronic control has been specifically designed for the 3D however most Copeland compressors have oil pump designs that can utilize this control Sentronic can replace existing capillary tube controls in the field and retrofit older Copeland compressors with compatible oil pump designs As in the past all new and replacement Copelamatic motor compressors equipped with oil pumps require the use of an approved safety control Failure to use an oil pressure safety control will be considered a misuse of the compressor To meet Copeland specifications an oil pressure safety control must maintain its pressure setting and time delay calibration within close limits over the widest variation in operating conditions This control must successfully pass a life test with a minimum 200 000 cycles Controls must be of the nonadjustable manual reset type with a 120 second nominal time delay at rated voltage They must have a cut out pressure of 9 psid 2 psid witha maximum cut in pressure of 14 psid Basic Operation The Sentronic oil pressure sensor mounts directly into the oil pump The sensor measures oil pump differential pressure i e the difference between oil pump outlet pressure and crankcase pressure The oil control sensor will then send an operating signal to th
31. fectiveness of NC 2 17 2 Parallel System w NC 2 amp Heat Recovery June 2007 8 ENVIROGUARD PARALLEL COMPRESSORS Diagram for Parallel System with NC 2 amp Heat Recover in Installation amp Service Manual Pi JAVA TIVda ss3ooy SANA TINE AATA gt gt OH 3unssaud 8 uolvuvdas 199 AHO1OV4 Idid NOILONS I AlddNs amori PO m IVNOILLdO Sud3 pas 225 Sud lt m i AHOLOVJ eee ee INIV1O3H 1V3H 39vdS ONidid 1315 H3SN3dNOS 1SOHJ3d OIHLO3T3 HO 440 AINIL SNIdld Z ON ADVLS HHH T HHH T HHH T HLIM WALSAS III TID LITT TD D HIT 96 80 V uolVHOdVA3 uolvuOdv g HHH Parallel System w NC 2 amp Recovery 17 3 June 2007 PARALLEL COMPRESSORS TYLER amp ENVIROGUARD REFRIGERATION Parallel System with Heat Recovery amp Companion In the medium temperature range the typical refrigeration case load operates at 20 F suction temperature Lowering the pressure to accommodate a few meat or deli operating at 10 15 F would pen
32. g N A See Section 9 1 PENN Oil Pressure Safety Switch All Copeland and Carlyle compressors 5 HP and above are equipped with Lubrication Protection a PENN term LUBRICATION The control is completely non adjustable and set to Copeland amp Carlyle specification Oil Pump Connection The P45 control measures the net oil pressure available to circulate oil through the lubrication system Net oil pressure is the difference between the oil gauge pressure and the refrigerant pressure in the crankcase When the compressor is started the time delay heater is energized If the net oil pres sure does not build up to the heater off or cut out value within the required time limit schrader the time delay trips to stop the compressor Valve E Sea SMM iim 2 If the net oil pressure rises to the heater off or cut out value within the required time after the compressor starts the time delay heater is automatically de energized and the com pressor continues to operate normally Crankcase Connection If the net oil pressure drops below the heater on or cut in value during the running cycle the time delay is energized If the net oil pressure does not return to the heater off or cut out value within the time delay period the compressor will be shut down June 2007 Component Description amp Definitions 18 5 PARALLEL COMPRESSORS TYLER amp ENVIROGUARD
33. harge to the receiver As temperatures pressures drop the OPR valve opens allowing gas from the compressor discharge to maintain the pressure in the receiver This also causes liquid to start backing up in the condenser because the receiver will be at a higher pressure than the condenser During low ambient periods the system pressure will be maintained at the setpoint of the OPR valve The OPR is also known a downstream pressure regulator NC 2 This system operates with the receiver continuously at the same head pressure as the condenser Refer to Pressure Regulator Settings on pages 9 1 amp 9 2 for proper pressure settings design raises system efficiency by maximizing the amount of natural liquid subcooling while allowing the compressors to operate at the lowest possible compression ratios Simplicity is attained by reducing the number of valves in the system NC 2 functions with a normally open solenoid valve located in the liquid return line between the condenser and the receiver With this valve open there is direct and unconstrained liquid flow from the condenser to the receiver head pressures are allowed to float The only time the solenoid valve will close is during NC 2 operation or for gas defrost if used During NC 2 operation when the temperature of the liquid returning from the condenser is less than 70 F flow will completely bypass the receiver NOTE Use of split condenser piping may reduce the ef
34. he R 22 refrigerant in low temperature applications Demand cooling diverts refrigerant to the compressor See Figure 2 on page 21 3 The demand cooling module uses the signal of a discharge head temperature sensor to monitor discharge gas temperature If a critical temperature is reached the module energizes an injection valve which meters a controlled amount of saturated refrigerant into the compressor suction cavity to cool the suction gas If the discharge temperature rises above a preset maximum level the module will turn the compressor off and activate its alarm contact This shut down will require a manual reset See Control Setting chart at the bottom of this page Temperature Sensor Injection Valve FIGURE 1 DEMAND COOLING SYSTEM COMPONENTS REPRINTED FROM COPELAND ENGINEERING BULLETIN AE 1287 CONTROL SETTINGS Cut In Temperature 292 F non adjustable Cut Out Temperature 282 F non adjustable Trip Temperature 310 F non adjustable June 2007 R 22 Low Temperature Demand Cooling 21 1 PARALLEL COMPRESSORS TYLER amp ENVIROGUARD REFRIGERATION TYLER Part Number for Demand Cooling Kits 5931213 F 8D ____ 5930214 Demand Cooling Kits include Demand Cooling Module w 2 mounting screws Temperature Sensor w 3 ft of shielding cable Injection Valve and Solenoid w mounting hardware and an Installation Troubleshooting Guide TYLER Part Number Demand Cool
35. he same time Since the effective area of the bellows and the disc are the same the two pressures cancel out The force of the incoming pressure alone will work against the spring pressure to operate the valve ACCESS VALVE See page 9 1 for pressure setting requirements June 2007 Component Description amp Definitions 18 3 PARALLEL COMPRESSORS TYLER 8 ENVIROGUARD REFRIGERATION ORIT amp IPR or A 8 Pressure Settings PRESSURE ORIT 10 IPR 10 IPR 10 IPR 6 SETTING SPOR X62 GR5172 GR5171 GR5170 PSIG DEPTH DEPTH DEPTH DEPTH wer wmm ef ine ae mee se wer se mm Changes per turn ORIT 10 17 psig IPR 10 14psig IPR 6 24 psig 8 N A See Section 9 1 Adjusting IPR and OPR Valves The factory setting must be adjusted to recommended settings soon after starting the system The valve can be adjusted by installing a pressure gauge on the Schrader valve and turning the adjusting screw IN to raise the pressure An allen wrench is required for the adjustment screw Remember The system must be in defrost to provide flow through the valve Outlet Pressure Regulator OPR REMOVE CAP ADJUST ADJUSTING SPRING This valve is designed to be sensitive only to its outlet pressure The inlet pressure is exerted on the underside of the bellows and on the top of the seat disc Since the effective area of the bellows is equal to the area of the port the inlet pressure cancels out and
36. ich may be in the system A moisture indicating sight glass 2 tells when the drier needs to be changed it also shows flow through the liquid line A liquid level gauge on the receiver determines the system charge Factory piping includes three ball shutoff valves 3 to aid in servicing There are also service valves at each station on the liquid manifold 4 and suction manifold 5 Additional ball valves 6 are recommended and optionally supplied for field installation at the points shown This makes the completed system fully serviceable at any point with a minimum of refrigerant loss Each compressor has a replaceable core suction line filter 7 A schrader valve is on the filter body one can also be installed on the suction service valve of the compressor to make a pressure drop check of the filter s condition possible June 2007 Parallel System w NC 2 amp Heat Recovery 17 1 PARALLEL COMPRESSORS TYLER amp ENVIROGUARD REFRIGERATION Discharge gas from the compressors is piped through an oil separator 8 Refrigeration oil is removed from the hot gas and oil mixture to be sent back to the oil float system This lubricates the compressors and minimizes the amount of oil getting in the evaporators Oil from the separator is piped into an oil reservoir and distributed to the oil level controls on each compressor Most parallels are equipped for heat recovery HR so that heat may be reclaimed and put back into the
37. in defrost This is accomplished using an electrically operated DDPR valve 6 in the discharge line The system pressure pushes hot gas through the suction line where it condenses into liquid in the frost laden evaporator coil Movement of the condensed hot gas liquid into the liquid manifold is induced by creating a 20 pound drop in the liquid pressure This is done with the normally open OLDR valve 7 When a part of the system goes into defrost the OLDR valve 7 is energized and modulates to a partially closed position creating the pressure drop required This valve arrangement provides the necessary pressure difference to ensure a reverse flow through the specific branch circuit The OLDR valve 7 and the DDPR valve 6 operate together during any defrost cycle When the defrost is terminated the DDPR valve 6 and the OLDR valve 7 are returned to the open position allowing normal system operation to resume This valve arrangement provides both system stability and the necessary difference in liquid pressures to ensure flow of the condensed hot gas liquid from the defrosting fixture June 2007 Refrigeration Circuits 15 3 PARALLEL COMPRESSORS Installation amp Service Manual amp ENVIROGUARD Receiver Gas Defrost Receiver gas defrost is accomplished by using the relatively cool gas from the top of the receiver The cool gas is discharged down the suction line to the evaporator where it begins to condense giving up latent heat
38. ing Components DESCRIPTION PART NO Electronic Control Module 5930500 Temperature Sensor 5930501 w 3 cable Temperature Sensor 5930502 w 10 cable 208 240V Injection Valve 5930503 Solenoid Coil 21 2 R 22 Low Temperature Demand Cooling June 2007 PARALLEL COMPRESSORS Installation amp Service Manual amp ENVIROGUARD System Information The correct injection valve must be used for each compressor body style In order to provide the necessary cooling when required the orifices in the injection valve have been carefully matched to each body style These orifices are large enough to provide the cooling but will prevent large amounts of liquid from being injected This helps prevent excessive system pressure fluctuation during injection valve cycling Normally pressure fluctuations should not exceed 1 to 2 psi Demand cooling is designed to work on all Copeland Discuss compressors equipped with injection ports The system must be clean The refrigerant injection line feeding the injection solenoid valve must tie in after the liquid line filter drier The liquid refrigerant supply line must be a minimum of 3 8 and routed so it will not interfere with compressor maintenance The liquid refrigerant supply line to the injection valve must be supported so that it does not place stress on the injection valve and injection valve tubing or permit excessive vibration A head fan must be used to help lower
39. ion as those on the modules already in the frame Then fit the module cut out located above the switches into the slotted frame rod align the tongue groove on either side of the module and snap the module down over the non slotted frame rod Check to be sure all red tabs line up and all 24 hour dial numbers line up Removal and or Installation of the Drive Module 1 To remove the drive module rotate black reduction gear until tongue groove with program module number 1 is parallel to the mounting surface 2 Loosen hex nut fully 3 Slide complete motor module parallel to the mounting surface and toward the 24 hour dials until the three locator studs clear their key slots then remove the module 4 To reinstall reverse the above steps 14 2 Multi Circuit Time Clock Module June 2007 PARALLEL COMPRESSORS Installation amp Service Manual amp ENVIROGUARD Program Charts for Multi Circuit Timers Below are program charts for the multi circuit time clock These charts may be used to design a defrost program for an entire parallel system TIME OF DAY DIAL 1 EVEN HOUR MODULE 2 EVEN HALF HOUR MODULE 3 ODD HOUR MODULE 4 ODD HALF HOUR MODULE 5 EVEN HOUR MODULE 6 EVEN HALF HOUR MODULE 7 ODD HOUR MODULE ODD HALF HOUR MODULE TIME OF DAY DIAL
40. ions 18 1 PARALLEL COMPRESSORS amp ENVIROGUARD TYLER REFRIGERATION OLDR Liquid Differential Regulator Valve Coil Energized OLDR 20 Differential Operation Figure 1 GAS BYPASS LINE 2 gt CHECK VALVE OLDR VALVE CHECK BALL VALVE VALVE Heat Recovery Valve SUCTION CONNECTION RECLAIM CONDENSER COMPRESSOR DISCHARGE NORMAL CONDENSER 18 2 Component Description amp Definitions OPR BALL VALVE RECEIVER The OLDR Valve is used at the outlet of the receiver to provide a pressure difference between the gas manifold and liquid line manifold This assures liquid refrigerant movement from case coils while on defrost Any lack of liquid refrigerant for circuits not in defrost is made up using liquid in the receiver LATENT GAS SUPPLY RELIEF VALVE BALL LIQUID INLET VALVE This 3 way valve is used for heat reclaim thereby eliminating the need for an N O solenoid In the de energized position the discharge gas is routed through the outside condenser and the gas in the heat recovery coil is isolated using check valves The gas in the line between the diverting valve and the check valve upstream of the heat recovery coil is fed back through the valve and into the suction side of the system In the energized position discharge gas is fed through the valve and into the heat reclaim coil and then into the remote condenser The line to the su
41. ltage 120VAC between the M terminal and the 120 terminal It should be the same as the electrical outlet voltage About 120VAC Since there is no connection made to the pressure sensor the module sees this as a no oil pressure condition After two minutes 15 seconds dependent on 50 or 60 cycle frequency the Sentronic internal timer will time out The module will trip the circuit between L and M will open and it will no longer pass current to the load With the voltmeter connected to terminals and 120 the voltage should now read zero volts because the circuit between and M has been opened through the action of the electronic circuit Reset the Sentronic then remove voltage from terminals 120 With a small piece of wire jumper the female sensor connections at the end of the black sensor cord attached to the module Reapply power to terminals 120 and wait two minutes The module should not time out after two minutes because jumpering the sensor connections makes the timing circuit see good oil pressure The jumper imitates the action of a small pressure switch located in the sensor This switch opens on low oil pressure and closes on good oil pressure Measure between the 120 terminal and the M terminal with the voltmeter The meter should read full line voltage showing that the circuit has not opened To check if the module will ope
42. ne temperature See page 17 5 for Piping Diagram for Parallel System with Heat Recovery amp Companion 17 4 Parallel System w NC 2 amp Heat Recovery June 2007 PARALLEL COMPRESSORS amp ENVIROGUARD Installation amp Service Manual Diagram for Parallel System with Heat Recovery amp Companion in Pi 3ATVA AANIVA O N H3AI3O3H YOSHO 00 SAIVA YOLWINOSY 69 BsvdAg svo TIVI LN3Ua 4410 1SOdd430 ITI O A s lt 83119 NOILOnS AHOLOVJ TOJINVANGLONS Og g g JAVA AlddNs OF eS Q gg 9 Adang anon 50 D 2 Halda Tvg AHOLOVJ 31SNIS V 1508438 570 LN31V1 SNIadld HON NOILOAPNI dINODN ANYANA YASNAG N OO 69 9 ADVLS TIONIS x I O INSIESAS TaTIVuvd O HOlVHOdVA3 HOlVHOdVA3 HOLVHOd WA ve Parallel System w NC 2 amp Heat Recovery 17 5 June 2007 PARALLEL COMPRESSORS TYLER 8 ENVIROGUARD REFRIGERATION Parallel System with Mechanical Subcooling Mechanical subcooling makes the entire system more efficient and allows closer sizing of compressor to cases in the sunbelt
43. noid This slows and eventually stops the feeding of refrigerant through the expansion valve while in defrost and is often used on medium temperature circuits June 2007 Refrigeration Circuits 15 1 PARALLEL COMPRESSORS TYLER amp ENVIROGUARD REFRIGERATION Gas Defrost Piping Arrangements E SORIT BEPRS This type of EPR valve 8 is a minimum pressure drop valve which uses the system s high pressure to operate the valve With regards to Sporlan s SORIT the initial S stands for the solenoid stop ORI stands for Open on Rise of Inlet Pressure and the T is the schrader access valve used in adjusting the valve 8 The SORIT s suction stop solenoid is controlled by the time clock or computer controller and closes the valve during defrost F An optional variation of E adds a liquid solenoid 9 just upstream of the expansion valve The solenoid can be used for temperature control in conjunction with the EPR On all of these arrangements the hot gas line is equipped with a solenoid valve At the beginning of defrost the valve is opened allowing hot gas to flow to the evaporator coil A termination thermostat operating a pilot circuit shuts off the gas flow when termination temperature has been reached in the fixture The EPR valve does not open again until a drip down or drain down time has been allowed A 10 to 26 minute time period allows the evaporator coil and drain pan to clear The entire
44. orator while it is defrosting Termination with electric defrost is by TG sensing relays all cases except N6F amp N6FL or a termination pilot circuit All termination methods use the failsafe feature of the multi circuit time clock or a control relay in a computer controlled application A Liquid flow can be interrupted by a factory mounted normally closed liquid line solenoid valve 1 controlled by the multi circuit time clock or computer controller An evap orator pressure regulator EPR 2 valve is factory installed on the suction stub of the compressor rack for temperature regulation by pressure of the entire lineup A variation of A omits the liquid line solenoid valve Instead the EPR 3 is equipped with a solenoid valve controlled by the multi circuit clock or computer controller When the solenoid valve is energized it will force the EPR to shut Suction stop and refrigerant flow in the lineup will cease C When precise case temperature control is desired each case is equipped with a liquid line solenoid valve 4 normally closed which is cycled by a thermostat The thermostat will use a bulb to sense entering air temperature No EPR valve is required The control circuit for these multiple solenoids will be controlled by the multi circuit clock or computer controller D This lineup is a variation of A The suction stop feature of an EPR 5 is employed for defrost in combination with a liquid line sole
45. p Troubleshooting 20 1 PARALLEL COMPRESSORS TYLER amp ENVIROGUARD REFRIGERATION Troubleshooting SYMPTOMS POSSIBLE CAUSES A Compressor hums but will PO not start B Compressor will not run and will not try to start no hum circuit breaker or open disconnect C Compressor starts but trips on overload 3 Defective run or start capacitor the compressor 3 Discharge pressure too high 4 Discharge valve plate leaking 20 2 Maintenance amp Troubleshooting June 2007 PARALLEL COMPRESSORS Installation amp Service Manual amp ENVIROGUARD SYMPTOMS POSSIBLE CAUSES Se the condenser F Head pressure too low pP Headmaster temperature too high 5 Improperly adjusted expansion valve 6 Compressor malfunction See F 3 above June 2007 Maintenance amp Troubleshooting 20 3 PARALLEL COMPRESSORS TYLER amp ENVIROGUARD REFRIGERATION SYMPTOMS POSSIBLE CAUSES 1 Loss of oil from compressor due to a Oil trapping in system b Compressor short cycling Insufficient oil system too low of suction pressure the compressor 20 4 Maintenance amp Troubleshooting June 2007 PARALLEL COMPRESSORS Installation amp Service Manual amp ENVIROGUARD R 22 Low Temperature Demand Cooling The Copeland Demand Cooling System Figure 1 uses electronics to counteract the occasionally high internal compressor discharge temperatures created by t
46. pim s 3 PNIPHP 42 NLF NVF TLM TLF TLM 2 4 6 L R Termination thermostats are open on rise See case specific Installation amp Service Manuals for proper locations 12 4 Defrost Control Strategies June 2007 PARALLEL COMPRESSORS Installation amp Service Manual amp ENVIROGUARD Hot Gas Defrost Requirements Chart CASE DATA HOT GAS DEFROST _____________ ___ _ _ HOTGASDEFROST AIR TEMP SETTINGS PER TIME TEMP CYCLE MODEL F 22 R404A DAY MIN TEMPS ncs s 8 1 253 5 eet pel a NCBX NCEX mme mI T NCJGCX NCJGECX fourm ma 5 2 gt DUAL TEMP 7 20 25 55 ees ser cp fe MENS as 7 4 23 259 s NENX NFNGX NFBX NFBGX 14 2 3 25 30 55 NFEX NEGEX NFJCX NFJGCX 14 2 3 20 25 55 NFJECX NFGECX NFMJCX NFMJGCX 15 22 2 3 20 25 55 DUAL TEMP 2 3 16 20 55 50 40 NFWX NFWGX 20 25 NFWEX N6F N6FL 22 25 60 40 P5FG ipd 20 25 25 10 14 50 EN es HH lm x 388 _ 17 20 a i820 28510 18 20 20 2510 6 5 16 20 50 40 NFJCX NFJGCX 20 bos eee pew NFWX NFWGX 16 20 50 40 Ee a a
47. rate on 208 240 volts as well as on 120 volts change the scale of the voltmeter if necessary to read up to 250VAC Without removing power measure the voltage between the M terminal and the 240 terminal You should read nearly twice the voltag as that read between the M terminal and the 120 terminal This is because Sentronic has a small control transformer connected so that it can accept either 120V or 208 240V It s self transforming action actually enables it to step up its own voltage By making this voltage chack the transformer is being checked If the module successfully passes the above test sequence it is fully functional If the module fail s any of the above steps it is faulty and should be replaced 19 8 Optional Sentronic Electronic Oil Pressure Control June 2007 PARALLEL COMPRESSORS Installation amp Service Manual amp ENVIROGUARD Maintenance amp Troubleshooting Maintenance Compressors Lubrication Check oil level in the compressor crankcase sightglass on a regular interval after initial run check at least monthly If the level is low add according to instructions in this manual and the cause of oil migration corrected If the system has a suction filter check for pressure drop across the filter A plugged suction filter can lead to high oil levels Dirty or Discolored Oil Indicates One of the Following 1 Contaminants in the oil such as air moisture and acids 2 Operating the comp
48. ressor in a vacuum This will cause a lack of suction cooling and in turn overheats and discolors the oil 3 Improper air flow on air cooled compressors can cause the oil to overheat 4 the oil appears contaminated the liquid line filter should be changed The first time the oil becomes discolored a new liquid line filter is usually enough to remedy the problem Any following oil discoloration will require the oil to be changed Mountings Check all compressor mountings for tightness Vibration may cause the mountings to loosen placing unnecessary stress on the compressor piping Check mountings every 6 months Line Connection Check and tighten all compressor lines and service connections including access fittings such as schrader valves Check line and valve connections every 6 months Electrical Turn off all power to rack before checking or tightening any wire connections Check all electrical connections to see that they are tight Loose connections can cause several problems including low voltage conditions and line arcing Check electrical connections every 6 months Refrigerant Piping Refrigerant piping and fittings should be checked for tightness and leak integrity on a regular basis Any time a refrigerant charge is required for a system a careful leak check should be made of the system Refer to EPA and local requirements for expected leakage and repair documentation process June 2007 Maintenance am
49. rollers will not sacrifice proper equipment operation or cause costly problems The best sensing points for termination vary with manufacturer and style of case These locations should be adhered to per the manufacturer s recommendations Electric amp Time Off Defrost Requirements Chart CASE DATA ELECTRIC DEFROST TIME OFF FAILSAFE TERM FAILSAFE SETTINGS DEF TIME TEMP CYCLE DEF TIME MODEL R 22 R404A pay MIN NCSX NCSGX NEC EACH CN NCNX NCNGX 3 NCBX NCEX NCJGCX NCJGECX NTJCX NTJGCX 25 15 3 7 8 14 DUAL TEMP NOWY 8 is 25 EU NME Es sei ES UE NE 36 60 NFX NFSX NFSGX NFBX NFBGX 15 NFGEX Dp NFJCX NFJCGX NFJECX NFJGECX NFMJCX NFMJGCX 15 22 14 50 DUAL TEMP NFWX NFWGX NFWEX 10 17 23 40 55 emm lw bw lawl T j ANTHONY 101 19 40 20 Peumnaaton e 2 4 6 42 NL 5 ns ANTHONY 101 1 18 40 20 emmo x fest v 4 42 50 mx Lr 50 159 ee 5 EE LL gt lt 5 MIN 69 12 2 Defrost Control Strategies June 2007 PARALLEL COMPRESSORS Installation amp Service Manual amp ENVIROGUARD CASE DATA ELECTRIC DEFROST TIMEOFF DISCH EPR FAILSAFE TERM FAN FAILSAFE AIR TEMP SETTINGS DEF TIME TEMP CYCLE
50. se Once the fail safe drain time has expired the valves at the compressor rack will return to the refrigeration mode and pull down begins All termination sensors should be mounted on the bypass check valves around the expansion valve Fans are cycled off during the defrost except on horizontal type freezers dual temps will cycle in medium temp mode An alternative using electronic controllers to control the gas valve from sensors that replace the original defrost limiting thermostats The sensors are located at the same sensing points as the thermostats For best results these should be connected to cycle only the gas valve June 2007 Defrost Control Strategies 12 1 PARALLEL COMPRESSORS TYLER amp ENVIROGUARD REFRIGERATION Refer to the electronic controller installation manual when using thermostats for termination instead of electronic sensors Some controllers require a close on rise indication If close on rise is used wire the thermostats in series Other controllers allow open on rise or close on rise indication If open on rise is used wire the thermostats in parallel Fan Control amp Defrost Termination Temperatures The following charts list specific fan control and defrost termination temperatures for electric time off and gas defrost Additional information or models not shown in the following charts should be obtained from the O E M These guidelines were established to help assure that electronic defrost cont
51. sec 15 sec MAX CONTROL 720 120 240 V 500 VA 120 240 V CIRCUIT VOLTS AMPS 120 Volt 6 0 Amps 120 Volt 4 2 Amps 230 Volt 3 8 Amps 230 Volt 2 2 Amps SENSOR TORQUE 60 65 ft lb 60 65 ft lb The sensor and module are provided as a set If a sensor or module is defective order the Sentronic kit from TYLER Refrigeration June 2007 Optional Electronic Oil Pressure Control 19 7 PARALLEL COMPRESSORS amp ENVIROGUARD TYLER Electrical Bench Checkout Procedure The following instructions describes how the Sentronic may be easily bench checked using only a voltmeter and a 120VAC electrical extension cord CAUTIONS Damage to the Sentronic module may result if the M terminal of the Sentronic is connected to ground or directly to a voltage line This test is conducted with 120VAC A shock will result if the Sentronic terminals are touched when the Sentronic module is energized Use care whenever working with any voltage Make sure your electrical outlet is grounded the electrical extension cord used has a ground wire and the ground wire is connected to the grounding screw of the Sentronic Apply 120VAC power to the Sentronic module terminals marked 120 The Sentronic should have a jumper in place between terminals M and 2 Wait two minutes then push the Sentronic reset button to reset the module and start the timing circuit With a voltmeter measure line vo
52. sor contactor CC by means of a DIAGRAMS 19 6 Optional Sentronic Electronic Oil Pressure Control June 2007 PARALLEL COMPRESSORS Installation amp Service Manual amp ENVIROGUARD Remote Relay When the Remote Relay is energized requesting the compressor to run its contact RR closes to deliver LL1 voltage energizes the compressors contactor coil CC When the compressor contactor closes it provides the power through a control circuit trans former XFMR to energize the Sentronic If the Sentronic trips its contact L to in the LL1 LL2 control circuit opens to de energize the compressor contactor and stop the compres sor The Sentronic contact L to A closes to energize an Alarm Relay Field Retrofit Considerations Sentronic can be used to replace conventional capillary tube style oil pressure controls in the field Before retrofitting determine if the existing oil pump is equipped with the plug fitting for mounting the sensor Order appropriate kit from TYLER Refrigeration NOTES Slight wiring differences exist from one manufacturer s unit to another If wiring modifications are unclear consult a certified electrician No wiring modifications are required with solid state motor protection Sentronic amp Sentronic Specifications Sentronic Sentronic CUT OUT 9 psid 2 psid 9 psid 2 psid CUT IN 12 14 psid 12 14 psid TIME DELAY 120 sec 15 sec 120
53. t a separate function before the refrigeration comes on for electronic controllers only 12 6 Defrost Control Strategies June 2007 PARALLEL COMPRESSORS Installation amp Service Manual amp ENVIROGUARD SECTION 13 Gas Defrosting Gas defrost is accomplished by diverting hot gas from the compressor discharge down the suction line and into an evaporator where it condenses to liquid refrigerant This provides a very rapid means of defrost Gas defrost is available for cases operated by a parallel system Gas defrost uses superheated compressor discharge gases to provide the heat source to melt the ice off of the evaporator coils About 25 of the cases can be defrosted at a time the other 75 of the cases are needed as a heat source for the defrosting cases Gas defrosts are initiated by a multi circuit time clock or a computer controller Both controls set the defrost initiation and duration times for all of the separate refrigeration circuits It is nec essary to program defrosts in the proper sequence Care must be taken not to schedule more than one defrost at a time No more than 25 of the rack system can be set to defrost at one time Gas Defrost Operating Principles In a gas defrost system hot refrigerant vapor is pumped directly through the evaporator tubing The system uses a series of valves to supply superheated vapor from the compressor or saturated vapor from the receiver through the suction line to the evaporator
54. t must be manually reset to restore the system to operation IMPORTANT If a power interruption occurs after an oil pressure safety trip wait two minutes before resetting after power is restored 19 4 Optional Sentronic Electronic Oil Pressure Control June 2007 PARALLEL COMPRESSORS Installation amp Service Manual amp ENVIROGUARD Control with Alarm Current Sentronic Previous Sentronic m Li ALARM VOLTAGE PATH BETWEEN LAND Li R ADDED ALARM RELAY x st EXI ING ALARM LIGHT L 4 T Vee DIAGRAM 4 DIAGRAM 4B Diagrams 4A new Sentronic and 4B previous Sentronic use an added alarm circuit To contrast the 4 and 5 terminal Sentronic with the new Sentronic The new Sentronic does not require an extra relay or auxiliary contact for an alarm circuit Using Current Sensing Relay to Prevent Nuisance Tripping of Pressure Control On motor compressors equipped with internal inherent protection and oil pressure safety controls it is possible for a trip of the oil pressure safety control to occur if the protector should open due to motor overheating or a temporary overload on the motor In such an event the control and contactor would still be closed although the compressor motor would not be operating The two minute timing circuit would be activated due to a lack of oil pressure and after the 120 second time delay the oil pressure safety control
55. t subjecting the refrigerated product to excessive warm up Temperature termination thermostats are used to sense when the refrigerant in the evaporator coil reaches a specific temperature DEFROST GAS FLOW REFRIGERATION INITIATION STOPS CYCLE RESUMES DEFROST TIME CLEAR TIME When the termination temperature is reached 70 75 F the hot gas solenoid will close If the coil cools and the termination time has not elapsed then the hot gas flow will resume This will continue until the allotted failsafe time on the time clock or computer controller has been reached The multi circuit time clock or computer controller will initiate defrost by introducing hot gas flow to the fixtures Defrost will continue until the temperature termination thermostats on all cases in the defrosting lineup close When all the termination thermostats are satisfied the hot gas solenoid will close Refrigeration will not restart until the entire time period set on the defrost clock passes This allows adequate clear time without overheating 13 2 Gas Defrosting June 2007 Installation amp Service Manual PARALLEL COMPRESSORS amp ENVIROGUARD Multi Circuit Time Clock Module The multi circuit time clock is a modular time clock with a frame drive motor and individual program modules The program modules clip into the frame and are held in place by a spring loaded latching lever Operation When the time clock is to be set up for initial op
56. ter an oil pressure safety trip wait two minutes after the power is restored before resetting Installing Sentronic All OEM Copeland compressors with oil pumps shipped after September 1986 have a plug fitting in the oil pump for mounting the sensor The current oil pump is designed to accept either the Sentronic sensor or a capillary tube for the traditional mechanical oil pressure control Optional Terminal Configurations Copper Washer Compressor Mounted Control Bracket _ Oil protection Control Bracket and locarion lead termination may vary Oil purnp as mounted an compressor E m lt Plug Fitting fDifferantial Pressure Sensa To Install the Sensor 1 Remove the plug fitting from the oil pump housing 2 Discard the copper washer from under the head of the plug fitting 3 Install a new o ring into the groove the sensor Use refrigeration oil to pre lube the o ring before installation NOTE Use care not to cut the o ring 4 Install anew copper washer under the hex flange of the sensor 5 Screw the sensor into the oil pump housing where the plug fitting was removed 6 Torque the sensor to 60 65 ft lb CAUTION Do not over torque the sensor during installation Over torquing could damage 19 2 Optional Electronic Oil Pressure Control June 2007 PARALLEL COMPRESSORS Installation amp Service Manual amp ENVIROGUARD To Inst
57. using the black drive gear on the motor module June 2007 MODULE PLATE TIME OF DAY POINTER BLACK PLASTIC TRIPPER TERMINATION LEVER Multi Circuit Time Clock Module 14 1 PARALLEL COMPRESSORS TYLER amp ENVIROGUARD REFRIGERATION Multi Circuit Time Clock Module Replacement module needs to be replaced be sure to use the right part There are 4 different modules The modules are designated with the letters D and Replace an with a B witha B and so on These modules have been factory set Do not try to change them Modules Red Tab set at 75 minutes B Modules Red Tab set at 45 minutes D Modules Red Tab set at 15 minutes E Modules Red Tab set at 105 minutes NOTICE RED TABS MUST BE ALIGNED TO ALLOW REMOVAL OR REPLACEMENT OF MODULES Removal and or Installation and Alignment of Individual Program Modules 1 To remove a program module rotate the black reduction gear on the motor module until the red tabs on all the 2 hour program dials come to the 12 o clock position Then pull out and up on the bottom of the module latching lever disengage and point module up from frame to remove 2 To re install a program module follow step 1 above and rotate the trailing modules by hand until all red tabs are at 12 o clock position Check to be sure that the black numbers on all the 24 hour dial are in the same posit
58. vio 9NIIOOOSnS 1 1 AHO LOVJ JI NIS 18044340 INSLV1 0 M AINON G 131d 4 NOISS3HdINOO 29 18 HLIM WALSAS qr sz 80 HOlVHOdV d HO1VHOdV 3 HOlVHOdV 3 awa u ANNY 10dd MO3HO MO3HO June 2007 16 2 Receiver Gas Defrost PARALLEL COMPRESSORS amp ENVIROGUARD Installation amp Service Manual ing Diagram for Parallel System with Latent Gas Defrost Pi SSHOOV xib4 b HJAISO3H fon JAYA 33199 aunssaud eo a pue I ITI 5 ITI yard SNIdld AHOLOVA 91315 ONIdid 31 NIS Lsoud3d SVO 1N31V1 ONidid AINON L ON NOISS3HdINOO 39 15 FTONIS HLIM WALSAS T3T VH Vd 96 72 180 HOlVHOdvA3 HOlVHOdVA3 HOlVHOdVA3 INN 1 8 Receiver Gas Defrost 16 3 June 2007 PARALLEL COMPRESSORS Installation amp Service Manual amp ENVIROGUARD Parallel System with NC 2 amp Heat Recovery TYLER Refrigeration manufactures multi compressor parallel systems with two or more compressors They can be of various size and capacity and operate at different suction temperatures All compressor units are electrically powered and use electro mechanical switches
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