SERVICE MANUAL - ApplianceAssistant.com
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1. 8 To Remove Fan Speed Switch scsscsssssssesesssesssstssnsesseesteateanseeseeseeaeeansanereseeaeeaesateneseeseeateaees 8 Bucket SWitch c ccssssssssessssesesessssesecesscsesessesesecscsesesseacsusssseseseeavaeescsvacsesscscseseesvacessesesesensesevaesesesness 8 To Remove Float scsccssseccessessessessesecsessecserseseesensessarsussesesecsarsesesesecsanseseeesesassensesensensensmeceeses 8 To Remove Bucket Switch c cscceccssseccccecceccesceceeceaceccscescesesacscesaeaceassaceaesavaceaseaceaesareneeseases i8 To Test Bucket Switch al ura ru ic NU RR E ERGO Dn uaa Defrost Gans Means SE eus Pa Ren nine Unas aea To Remove Defrost Thermostat 5 incra nosci ORE KNEE To Test Defrost rro ww Motor Motor Bracket amp Blower Wheel To Remove Blower Assembly cccccecceeeceeeeeeeeeeeeeeeeeesaeseaseeaneeaneoeeeeseeseeeseeseeeeeeeseeeeeeneeeneens Test le H III uie ol e Nasi COMIDIGSS OF MNT Permanent Split Capacitor PSC Compressor iz pKenIDgErtol S2. Equipment Needed Installing Evacuation amp Recharging Equipment eese Evacualing uci cto ee annie nio Utt emi nme tros Md ARUM aec Uds Charging The System M Final Leak TOS WIRING DIAGRAMS DATA SHEETS Electrical Wiring Diagrams Single Speed Fan Models with Reciprocating Compressors Two Speed Fan Models with Reciprocating Compressors Two Speed Fan Models with Rotary Compressors Dehumidifier Rating Sheets Models FDH25J amp FDH30J Mod l FDD4O M Model FDD50J Modal t panini ucc wiki inca PR v SAFE SERVICING PRACTICES ALL APPLIANCES To avoid personal injury and or property damage it is important that Safe Servicing Practices be observed The following are some limited examples of safe practices 1 DO NOT attempt a product repair if you have any doubts as to your abi
3. CiU on ee bro leiiejdplieRE EEs Charging Se led m cbr S Sealed Systemi m Sealed System Diagnosis Umelercharged Sy Stern RE Overcharged System Pressure Equalizing System Refrigerant Leaks c Component ar odd un Compressor Replacement a RR RR RR RR RR RR RR RR RR RR SER ERAS RR RR SR RR RR Rana Flush The Systemi Ke To Use Refrigerant To Flush The System Installing a New To Remove Evaporator or Capillary Tube nennen nennen nnne Remove CONDENSED Fe ali gb amp R charging
4. To Test Compressor Motor Possible Causes of Compressor Overloading or Overheating Compressor Test Cord for PSC Compressor nnmnnn Compressor Test Cord for Split Phase Compressor R nning Capacitors e M Compressor Overload Protector Test Mec EaR To Test Relay Split Phase To Replace Relay Split Phase REFRIGERANT SYSTEM SERVICE INSTRUCTIONS iil c Recycling sa FROG
5. FRIGIDAIRE HOME PRODUCTS SERVICE MANUAL DEHUMIDIFIER MODELS 1 Speed 2 Speeds FDH25J FDD40J FDH30J FDD50J FDD60J EFRIGIDAIRE TAPPAN WY White Westinghouse Gibson Kelvinator 2 P N 5995334660 May 2000 TABLE OF CONTENTS SAFE SERVICING PRACTICES ALL APPLIANCEG 3 INTRODUCTION uri X 4 Model amp Serial Numbers 4 Basic Operation and Initial Startup 4 Electrical Informati n s sisien vex EFE NR A In Gn GR Compressor Information nee cuinieet cases esk E eara Sk conscesuccelwel sens sense OPERATION amp REPAIR INSTRUCTIONS 6 Remove 6l To Remove Front Grille 6 To Remove Top COVeF 6 Remove 6 Control Assembly To Remove Control Assembly To Remove amp Remove Full Bucket Pilot Light nana archie nni gi kara adu i Gk kiki adi n aan 8 To Test Fan Speed Switch
6. Running capacitors are used on some compressor motors to increase the efficiency of the motor by improving the power factor Always replace running capacitors with capacitors of like type and pF microfarad rating Pay particular attention to the voltage rating To Test Capacitor WARNING AN INTERNALLY SHORTED CAPACITOR MAY EXPLODE IF ENERGIZED DIRECTLY WITH LINE VOLTAGE CHECK ONLY WITH AN OHMMETER OR CAPACITOR TESTER AFTER TESTING ALWAYS DISCHARGE CAPACITOR WITH A 20 0000 OHM 2 WATT RESISTOR PLACED ACROSS THE TERMINALS Disconnect dehumidifier from electrical supply Remove wrapper Discharge capacitor GUN SS NOTE Best method of discharging capacitor is with insulated copper wire in series with a 20 000 ohm 2 watt resistor Place this high resistance jumper across capacitor terminals 4 Disconnect capacitor wiring 5 Connect ohmmeter across terminals of capacitor to be checked a If capacitor is good needle should jump toward zero ohms and quickly drop back to infinity b If needle does not move capacitor is open c If needle reads constant value at near zero ohms capacitor is shorted d If needle jumps toward zero and falls back to constant high resistance value not infinity capacitor has high resistance leak e Check for ground from each terminal of capacitor to bare metal of capacitor case Resistance should be infinite If resistance is less than infinite capacitor is grounded
7. 22 if refrigerant is used to flush system This is the only refrigerant that can be used to flush the system and it must be recovered CAUTION The end of flushing hose of tank regulator must be equipped with a hand shut off valve Robinair No 40380 Close handshut offvalveandadjustnitrogen regulator to correct pressure before proceeding with flushing procedure To Use Refrigerant To Flush The System CAUTION Refrigerant used for flushing must be captured in a recovery bag Meter amount of refrigerant used for flushing with your charging cylinder DO NOT OVERFILL THE BAG 1 Remove suction and discharge lines on compressor and disconnect capillary tube from condenser Connect pro cess coupling to outlet and inlet tube of condenser 2 Connect hose to outlet process coupling and charging cylinder Connect another hose to inlet coupling and recovery bag 3 Open charging cylinder and allow refrigerant to flow through condenser until discharge into bag is clear 4 Connect process fitting to compressor suction line Flush evaporator and capillary tube NOTE If unable to get refrigerant flow through capillary tube remove capillary tube from evaporator and flush again 5 cap tube is blocked replace cap tube 6 Reassemble system Installing a New Compressor Allreplacementcompressors are shipped with rubber plugs in the suction discharge and process tubes and contain the correc
8. 7b 3 Using needle nose pliers squeeze plastic tabs against pilot light and push light through hole in assembly See Figure 8a Figure 8a To Test Fan Speed Switch 2 speed models only 1 Disconnect dehumidifier from electrical supply 2 Disconnect three wires connected to three terminals on fan switch 3 Using a multimeter on resistence scale take following readings See Figure 8b With fan switch in HI Terminals 1 amp 2 0 ohms Terminals 1 amp 3 max resistence Terminals 2 amp 3 max resistence With fan switch in LO Terminals 1 amp 2 max resistence Terminals 1 amp 3 0 ohms Terminals 2 amp 3 max resistence 2 P m Figure 8b To Remove Fan Speed Switch 2 speed models only The Fan Speed Switch is very difficult to remove without destroying it Do not attempt to remove the switch unless it is faulty Then it really doesn t matter if the switch is damaged during removal However do be careful not to damage the control assembly during removal The new switch will fit into place nicely once the faulty switch has been removed Bucket Switch The bucket switch is a Single Pole Double Throw SPDT device that shuts off the dehumidifier when the bucket is full The switch is activated by a float see Figure 8c mounted inside the bucket The switch is mounted to the frame directly behind the bucket See F
9. Compressor GROUND GROUND REFRIGERANT SYSTEM GREEN BUCKET SHUT OFF SWITCH INDICATOR LIGHT FAN MOTOR TWO SPEED RED FAN SWITCH OVERLOAD DEFROST CONTROL HUMIDISTAT RED 20 DEHUMIDIFIER RATINGS Models FDH25J FDH30J Pints 24 Hrs 25 30 Frequency 60 Hertz Amperage 6 5 Liters KWH 84 1 0 Voltage 115 VAC Power Factor 0 79 Samsung Compressor Air System Model FMA60C2Y Fan Motor Mfg McMillan Type SP Part 327603702 LRA 302 Part 327650409 Overload 4TM798SFBZZ 53 P N E716812 Poles 6 Frame 42 Dia 5 12 Start Relay MTRP0051 02 Amps 1 01 Watts 91 Capacitor None Oil Charge 280cc Blower Wheel Thorgren 7 x 2 327360001 Evaporator Condenser P N Part of 327650810 DHC E 2022 P N Part of 327650810 DHC E 2022 Length 10 38 O D 5 16 MAT L 14 TB 1 Row Length 10 38 O D 516 MATL 14 TB 1 Row Smooth 4 Wall 016 Inl amp Outl Smooth 4 Wall 016 Inl amp Outl Grooved 10 Type 0118 Min WL Grooved 10 Type 0118 Min WIL Fins Inch 15 Material 0042 Alum Fins Inch 15 Matl 0042 Alum Fins Height 11 2 Butterfly Inlet To 253 255 ID on line Butterfly Inlet To 090 093 ID onLine Butterfly Outlet To 090 093 ID on line Coil is mounted on the same common brackets with Coil has common end bracket with evaporator Strainer is single row condenser in the 2nd tube at the bottom Tubing Suction P N
10. Replace capacitor if it is open shorted grounded or has a high resistance leak Compressor Overload Protector An overload protector is attached to the compressor to detect excessive heat or a current overload If the overload is actuated it will shut off the current to the compressor and automatically reset itself after a short cool down period The compressor will attempt to start after the cool down period The overload is located under the terminal cover To gain access to the overload disconnect the dehumidifier from the electrical supply and remove the terminal cover To Test Overload 1 Disconnect dehumidifier from electrical supply 2 Remove wrapper 3 Remove terminal cover 4 Disconnect all wiring to overload and check across overload terminals with ohmmeter Overload should be at room temperature when checked Zero ohms 0Q should be indicated NOTE Always replace terminal cover and gasket to protect overload and compressor terminals from moisture and corrosion To Test Relay Split Phase Compressor 1 Disconnect dehumidifier from electrical supply 2 Remove relay and overload cover from compressor 3 Disconnect wire to relay and remove relay from compressor terminals pull straight off 4 Check continuity of relay coil refer to wiring diagram for proper terminals to check across If relay coil checks OK use compressor test cord to test compressor 5 If PTC relay is used check resistan
11. caused by high head pressure and low suction pressure Allow the pressures to equalize through the capillary tube Pressure equalizing system unloading will usually take 2 to 3 minutes Refrigerant Leaks An undercharge of refrigerantis usually caused by a leak in the system Such leaks must be located the refrigerant recovered and the leak repaired before evacuating and recharging Simply adding the refrigerant or recharging will not permanently correct the problem and may lead to a compressor burn out NOTE Do not replace a component because the system is undercharged unless a nonrepairable leak is found within the system components If a leak cannot be readily found the system should be pressurized to at least 75 psig gauge pressure If necessary attach a 74 line piercing valve to the com pressor process tube and add enough refrigerant for testing Only use the refrigerant specified on the serial nameplate NOTE The line piercing valve clamp on type should be used for test purposes only It must be 14 removed from system after ithas served its purpose Mostleaks can befound with a Halide torch However for very small leaks it may be necessary to use an Electronic Leak Detector orthe soap bubble method to pinpoint the leaks CAUTION Be sure the system has a positive pressure before using the soap bubble method of leak detecting A vacuum within the system could draw in moisture and contamina
12. evaporator The suction tube from the evaporator outlet to the compressor is insulated to prevent sweating NOTE Check the performance of the dehumidifier and electrical system before attempting to repair the sealed system SEALED SYSTEM DIAGNOSIS Undercharged System Disconnect fan motor leads and start the unit A slight uniform film of frost should form on the entire evaporator within about 10 minutes If it does not the system is possibly undercharged If an undercharged system is found perform the following Leak test unit Recover refrigerant Repair Leak Evacuate and recharge unit with proper amount of refigeratant NOTE Always leak test system after recharging Overcharged System Operate the unit for at least 30 minutes in a room temperature of 75 F to 85 F The top of the compressor should be warm to the touch This applies to a recipro cating compressor only If it is cool or cold the system is possibly overcharged On models eqipped with Rotary compressors check for frost or cold tempera tures all the way to the top of the accumulator An overcharged system must be evacuated and recharged Purging off excess refrigerant is not legal or practical as there is no way of determining the amount to purge Pressure Equalizing System Unloading Ifan attemptis made to start the unit too soon after ithas stopped the compressor may fail to start and will cycle on the overload protector This is
13. 1 Dia 5 16 OD Anti Gurgle P N 327351603 Dia 3 16 OD Process Tube P N 327160401 Dia 5 16 OD Trans Suction P N 309101304 Dia 5 16 OD Controls Humidistat P N 327362201 Freeze Control P N Refrigerant R22 Charged at Approximately 11 0 Air System Fan Motor Mfg McMillan Type SP Part 327650408 Poles 6 Frame 42 Dia 5 12 Amps 1 06 Watts 92 Capacitor None Blower Wheel Thorgren 7 x 2 327360001 Condenser P N Part of 327363201 LAB DHC 2024 Length 10 38 516 MATL 42 TB Row Smooth 4 Wall 016 Inl amp Outl Grooved 38 Type 0118 Min WIL Fins Inch 15 0042 Alum Butterfly Outlet To 108 111 ID on line Strainer is in the 2nd tube at the bottom Restrictor Cap TB MFR National Copper Mich Dowagiac Size 054 x40 106 A112116 P N 327363901 Formed Speed Volts RPM CFM Dry Sound DBA Unit Weight 24
14. 327304401 Formed Dia 5 16 OD Restrictor Discharge P N 327304301 Formed Dia 1 4 OD MFR National Copper Mich Dowagiac Anti Gurgle P N Dia Size 039 25 087 Blue Process 846A824H10 Dia 5 16 OD P N 327363801 A112143 Trans Suction P N Dia Controls Speed Humidistat P N 327362201 Volts Freeze Control P N RPM CFM Dry Sound DBA Unit Weight Refrigerant R22 Charged at Approximately 6 5 Ounzes 21 DEHUMIDIFIER RATINGS Model Pints 24 Hrs 40 Liters KWH 1 16 Frequency Voltage Watts 60 Hertz 115 VAC 680 FDD40J Amperage 7 5 Power Factor 68 Americold Compressor Model OSH 153 1 3686 Sound Reduced Part E815718 LRA 34 Overload E716801 MST 24 ADW PTC Relay 8EA401 E717001 Oil Charge 350cc Evaporator P N Part of 327361801 LAB DHE E 2022 A Length 10 38 O D 516 22 2 Row Smooth 4 Wall 016 Inl amp Grooved 18 Type C 0118 Min WL Fins Inch 13 Material 0042 Alum Fins Height 8 8 Butterfly Inlet To 191 194 ID on line Tubing Suction P N 327362601 Dia Discharge P N 327361501 Dia Anti Gurgle P N 327351602 Dia 3 16 OD Process 846A824H10 Dia 5 16 OD Suction Insulation E844706 1 E644705 99 1 5 16 OD 1 4 OD Controls Humidistat P N 327362201 Freeze Control P N Refrigerant R22 Charged at Approximately 8 0 Oz Air System Fan Motor Mfg McMillan Type SP Part 4 327650407 0
15. 9 2 Speed 1 Speed Poles 6 Frame 42 Dia 5 12 Amps 1 01 Watts 91 Capacitor None Blower Wheel Thorgren 7 x 2 327360001 Condenser P N Part of 327361001 LAB DHC 2023 Length 10 38 O D 516 MATL 28 TB 2 Row Smooth 4 Wall 016 Inl amp Grooved 24 Type C 0118 Min WIL Fins Inch 15 Matl 0042 Alum Butterfly Outlet To 102 106 ID on line Strainer is in the 2nd tube at the bottom H 11 2 Restrictor TB MFR National Copper Mich Dowagiac Size 049 x 27 099 A112151 P N 327364201 Formed Speed Volts RPM CFM Dry Sound DBA Unit Weight 22 DEHUMIDIFIER RATINGS Model FDD50J Pints 24 Hrs 50 Frequency 60 Hertz Amperage Liters KWH 1 55 Voltage 115 VAC Power Factor Watts 750 Goldstar Compressor Model QAO096CH11A Part A547107 LRA 26 Overload E716801 MST 24 ADW PTC Relay MRA 12074 386 A363772 Capacitor 30 MFD 370 VAC Oil Charge 250cc Evaporator P N Part of 327361401 LAB DHE E 2021 Length 10 38 O D 3 8 22 2 Row Smooth 4 Wall 016 Inl 8 Grooved 18 Type C 0118 Min WL Fins Inch 13 Material 0042 Alum Fins Height 11 0 Butterfly Inlet 191 194 ID on line Tubing Suction P N 327160201 Dia 3 8 OD Discharge P N 327363701 Dia 5 16 OD Anti Gurgle P N 327351603 Dia 3 16 OD Process Tube P N 327160401 Dia 5 16 OD Trans Suction P N 309101304 Dia 5 16 OD Controls
16. A GROUNDED WINDING CAN EXPEL A TERMINAL FROM ITS INSULATED HOUSING WHEN THE COMPRESSOR IS ENERGIZED IF THIS HAPPENS A MIXTURE OF REFRIGERANT AND OIL WILL BE RELEASED THAT CAN BE IGNITED BY AN EXTERNAL HEAT SOURCE OPEN FLAME HEATER ETC ALSO IF THERE IS AIR IN THE SYSTEM WHEN THIS HAPPENS A SPARK AT THE COMPRESSOR SHELL COULD IGNITE THE REFRIGERANT AND OIL MIXTURE NOTE If compressor has a permanent split capacitor PSC motor running capacitor should be tested first 11 Disconnect dehumidifier from electrical supply Remove leads from compressor terminals Check for grounded windings by testing continuity from each terminal to any copper tubing connected directly to compressor If continuity is indicated motor windings are grounded and compressor will have to be replaced Check for open windings by checking continuity from Start to Run terminals If no continuity is found a winding is open and compressor must be replaced Possible Causes of Compressor Overloading or Overheating 1 Shorted winding Recheck Start and Run windings 2 Low voltage With dehumidifier disconnected check voltage at electrical outlet Voltage should be of 115 VAC 10 Plug in dehumidifier and check voltage If voltage is not within 10 of 115 VAC compressor break down or overheating may occur Excessive voltage drop during start up or while running may be cause of motor overload opening Defective run capacitor if supplie
17. ALLY CLOSED COMMON Figure 9a Defrost Thermostat The defrost thermostat is mounted on the suction line close to the compressor When the ambient temperature drops below 65 F the evaporator coil temperature also drops and frost begins to form on the evaporator surface When the suction line temperature reaches 37 F at the location of the defrost thermostat the thermostat opens the circuit to the compressor When the accumulated frost melts and the suction line has warmed to 59 F the defrost thermostat closes allowing the compressor to restart The fan motor will continue to run when thermostat is open To Remove Defrost Thermostat 1 Disconnect dehumidifier from electrical supply NOTE Refer to procedures on page 6 to remove bucket front grille top cap and wrapper 2 Remove bucket front grille top cap and wrapper 3 Locate defrost thermostat just above compressor on suction line O 4 Disconnect two wire leads from thermostat 5 Remove insulation from around Defrost Thermostat so spring clip is exposed 6 Press on spring clip with thumb and raise thermo stat free from evaporator coil See Figure 9b 7 Reverse procedure to reassemble Figure 9b To Test Defrost Thermostat 1 Using Multimeter on resistance scale read resistance of thermostat between the two leads At room temperature above 60 F resistance should be zero 0 indicating the thermostat is closed 2 To see if thermostat opens when t
18. G DISCONNECT THE CHARGING CYLINDER HEATER AT THIS TIME TO PREVENT THE CYLINDER PRESSURE FROM EXCEEDING ITS MAXIMUM LIMITS 6 Allow system to sit for five minutes 7 Turnondehumidifier compressor Run compressor for few minutes and monitor system pressures 8 When satisfied that unit is operating correctly clamp process tube with pinchofftool while unitis still running 9 Remove process tube adaptor and solderthe process tube closed 11 Turn on unit After few minutes check process tubes for refrigerant leaks FINAL LEAK TEST 1 With dehumidifier turned OFF leak test all low side system components 2 Turn unit ON and run until condenser is warm Leak test high side system components WIRING DIAGRAMS DATA SHEETS ELECTRICAL WIRING DIAGRAM Single Speed Fan Models With Reciprocating Compressors GROUND BASE GROUND REFRIGERANT SYSTEM GREEN BUCKET SHUT OFF SWITCH INDICATOR LIGHT WHITE FAN MOTOR STARTER OR RELAY FAN MOTOR CONNECTOR RED OVERLOAD HUMIDISTAT RED 18 ELECTRICAL WIRING DIAGRAM 2 Speed Fan Models With Reciprocating Compressors GROUND BASE GROUND REFRIGERANT SYSTEM GREEN BUCKET SHUT OFF SWITCH INDICATOR LIGHT FAN MOTOR MOTOR STARTER OR RELAY TWO SPEED FAN SWITCH RED OVERLOAD DEFROST CONTROL HUMIDISTAT RED 19 ELECTRICAL WIRING DIAGRAM 2 Speed Fan Models With Rotary
19. Humidistat P N 327362201 Freeze Control P N Refrigerant R22 Charged at Approximately 11 0 Oz Air System Fan Motor Mfg McMillan Type SP 327650407 2 Speed Poles 6 Frame 42 Dia 5 12 Amps 1 01 Watts 91 Capacitor None Blower Wheel Thorgren 7 x 2 327360001 Condenser P N Part of 327361001 LAB DHC 2023 Length 10 38 O D 516 MATL 28 2 Row Smooth 4 Wall 016 Inl amp Outl Grooved 24 Type C 0118 Min WIL Fins Inch 15 0042 Alum Butterfly Outlet To 108 111 ID on line Strainer is in the 2nd tube at the bottom Restrictor Cap TB MFR National Copper Mich Dowagiac Size 054 x40 106 A112116 P N 327363901 Formed Speed Volts RPM CFM Dry Sound DBA Unit Weight 23 DEHUMIDIFIER RATINGS FDD60J Pints 24 Hrs 60 Frequency 60 Hertz Amperage Liters KWH 1 68 Voltage 115 VAC Power Factor Watts 700 Goldstar Compressor Rotary Model QA096CH11B Part A547107 LRA 26 Overload E716801 MST 24 ADW PTC Relay MRA 12074 386 A363772 Capacitor 30 MFD 370 VAC Oil Charge 250cc Evaporator P N Part of 327361401 LAB DHE E 2021 Length 10 38 O D 3 8 22 2 Row Smooth 4 Wall 016 Inl 8 Grooved 18 Type C 0118 Min WL Fins Inch 13 Material 0042 Alum Fins Height 11 0 Butterfly Inlet 191 194 ID on line Tubing Suction P N 327160201 Dia 3 8 OD Discharge P N 32736370
20. PSC Compressor This compressor has a Start and Run winding with a capacitor wired in series with the Start winding When power is applied the capacitor assists in bringing the compressor motor to optimum speed Split Phase Compressor This compressor has a Start and Run winding On models equipped with a current activated relay the relay is wired in series with the Run winding When power is applied to the Run winding The high starting current pulls the relay armature up closing contacts to complete the circuit to the Start winding The motor starts and accelerates to a point where the current is reduced enough to allow the relay to drop out and disconnect the circuit to the Start winding This point occurs at about 80 of full speed The motor continues to accelerate to full speed on the Run winding alone On models with PTC relay current is applied to both windings at the same time This starts the compressor As current flows through the relay to the Start winding the relay will increase in resistance Within a fraction of a second the resistance will climb high enough for the Start winding to drop out CAUTION Replacement compressors are charged with oil at the factory Care should be exercized when replacing a compressor to avoid spilling any oil To Test Compressor Motor WARNING WHENEVER TESTING A COMPRESSOR EXTREME CAUTION SHOULD BE USED TO PREVENT DAMAGING THE TERMINALS A COMPRESSOR WITH A DAMAGED TERMINAL OR
21. Positive Temperature Coefficient relay When power is applied to the Run winding on models with current relay the high starting current pulls the relay armature up closing contacts and completing the circuit to the Start winding The motor starts and accelerates to a point where the current is reduced enough to allow the relay to drop out and disconnect the circuit to the Start winding This point occurs at about 80 of full speed The motor continues to accelerate to full speed on the Run winding alone On models with PTC relay current is applied to both windings at the same time This starts the compressor As current flows through the relay to the Start winding the relay will increase in resistance Within a fraction of a second the resistance will climb high enough for the Start winding to drop out OPERATION amp REPAIR INSTRUCTIONS Bucket The bucket is mounted to the front of the chassis and is located beneath the cooling coil to catch the condensate A float mounted on the bucket is used to activate a switch to shut off the unit when the bucket is full of water If the unit is to be installed near a floor drain a permanent drain hose may be attached to the threaded hose connection on the bucket If you want water to flow directly into the drain place the hose connection of the bucket directly over the drain When using either method of draining a plastic membrane in the hose connection of the bucket must be cut out in order to
22. acuation a properly maintained two stage vacuum pump in good condition is required It is absolutely essential to maintain your vacuum pump according to the manufacturer s instructions including required oil changes at the recommended intervals Vacuum pump oil should always be changed after evacuating a contaminated system Vacuum pump performance should be checked periodically with a micron gauge 1 Make certain that charging cylinder valve hand shut off valve and manifold gauge valves are closed 2 Startvacuum pump 3 Openhandshut offvalve and slowly open manifold valve turning counterclockwise for two full rotations CAUTION If high vacuum equipment is used just crack manifold valve for a few minutes then open slowly for two full turns counterclockwise This will preventthe com pressor oil from foaming and being drawn into the vacuum pump 4 Operate vacuum pump for minimum of 30 minutes to attain minimum of 29 9 500 micron vacuum or until vacuum of 500 microns is obtained 5 Close hand shut off valve to vacuum pump Watch compound gauge for several minutes If reading rises there is leak in system go to step 6 If no leak is indicated stop vacuum pump System is now ready for charging 6 Ifleak is indicated stop vacuum pump and introduce small charge of refrigerant into system by cracking valve on bottom of charging cylinder until System is pressurized to 40 or 50 psig 7 Leak test l
23. ate and charge system using recommended procedure described under Evacuating and Recharging on pages 15 to 16 Reconnect compressor terminal leads Reassemble unit 12 13 14 NOTE On models equipped with Rotary Compres sors the process tube is on the high side of the system If you need access to the low pressure side of the system it is necessary to install a T in the suction line and add a process tube to it To Remove Evaporator or Capillary Tube 1 Disconnect dehumidifier from electrical supply 2 Remove bucket front grille top cap and wrapper 3 Recoverrefrigerant 16 Toreplacecapillarytube unsweattube from evaporator and condenser Remove and replace Toreplace evaporator unsweat capillary tube and suction line Removetopandcenterscrewsfromleftside ofevaporator Swing evaporator outfrom righthand side of condenser To Remove Condenser Disconnect dehumidifier from electrical supply Remove bucket front grille top cap and wrapper Recoverrefrigerant Unsweat capillary tube and discharge line Removethree screws securing evaporator and condenser from left side and one screw from bottom rightsecuring condenser Pullsuctionlineforwardfar enough to allow evaporator to be pulled out Removeonescrewatbottom ofsupportof blower motor assembly Bend all four tabs on top and bottom of condenser to outside and pull blower assembly away from condenser Liftcondenser outand
24. bber plug Disconnect electrical supply to dehumidifier Remove bucket front grille top cap and wrapper Remove one screw at bottom of support of blower motor assembly Bend all four tabs on top and bottom of condenser to outside and pull blower assembly away from condenser Recover refrigerant by using EPA approved recovery system Remove leads from compressor motor terminals Remove mounting clips or bolts holding compressor to base After refrigerant completely recovered cut suction and discharge lines as close to compressor as possible Leave only enough tubing to pinch off and seal defective compressor Plug or tape any open system tubing to avoid entrance of moisture and air into system Remove inoperable compressor and transfer mounting parts to new compressor Install new compressor in exact Same manner as original compressor 10 Reform suction and discharge lines to align with new compressor If they are too short use additional lengths of tubing Joints should overlap 0 5 inch to provide sufficient area for good solder joint Clean and mark area where tubing should be cut Cut tubing with tubing cutter Work as quickly as pos sible to avoid letting moisture and air into system NOTE If process tube is too short silver solder four inch piece of tubing onto process tube at this time 11 9 Solder all connections according to soldering procedure outlined on page 12 Evacu
25. cceptable in the appliance repair trade Frigidaire cannot be responsible nor assume any liability for injury or damage of any kind arising from the use of this manual INTRODUCTION This Service Manual may be used to service the following Dehumidifiers FDH25J FDH30J 30 Pint Speed Control 1 Speed 1 Speed Compressor Compressor Motor Reciprocating Split Phase Reciprocating Split Phase FDD40J 40 Pint 2 Speed Hi Lo Reciprocating Split Phase FDD50J 50 Pint 2 Speed Hi Lo Rotary PSC FDD60J 60 Pint 2 Speed Hi Lo Rotary PSC Permanently Split Capacitor Uncrating Uncrating instructions are clearly printed on the shipping carton See figures 4a and 4b to remove the unit from the carton Left Side Panel Clear Bag Right Side Panel Figure 4a Model amp Serial Numbers Model and Serial numbers are found on the Serial Plate located on the Front Panel directly behind the Bucket Figure 4b Figure 4c Basic Operation and Initial Startup The Dehumidifier consists of a small refrigeration system and a fan The fan moves the moisture laden air over the evaporator and condenser The moisture from the air condenses on the cold evaporator surface where it drips into a bucket A drain hose can be connected to the bucket The cool air then passes over the warm condenser raising its temperature Since this a
26. ce between L1 and Start winding Resistance should be no more than 4 ohms at room temperature To Replace Relay Split Phase Compressor 1 Disconnect humidifier from electrical supply 2 Remove wrapper 3 Remove relay cover from relay and overload 4 Remove wire from relay and pull straight off 5 Reverse procedures to reassemble REFRIGERATION SYSTEM amp SERVICE NOTICE Instructions given here are furnished as a guide Persons attempting to use these instructions to make repairs to the sealed refrigeration system should have a working knowledge of refrigeration previous training on sealed system repair and an EPA certification for servicing refrigeration systems IMPORTANT NOTICE Effective July 1 1992 the United States clean air act governs the disposal of refrigerants such as R 22 Therefore when discharging or purging the sealed system use an EPA approved refrigerant recovery system as outlined in the final rule on the protection of stratospheric ozone and refrigerant recycling which was published in the Federal Register May 14 1993 NOTE Frigidaire does not permit the use of recovered refrigerantin the servicing of our products for in warranty and out of warranty repairs or for products covered by service contracts Therefore only new refrigerant or refrigerant that has been reclaimed back to new specifications by a refrigerant manufacturer is to be used DEFINITIONS Recovery to remove refrigerantin any cond
27. d If compressor will not start or starts slowly or compressor runs but draws high current test capacitor Dirty evaporator and or condenser Insufficient air passing over condenser ONS 5 6 The compressor can also be operated on a test cord when connected as illustrated below CAUTION If compressor is a permanent split capacitor type use only a known good electrolytic capacitor rated for compressor being tested This running capacitor must be in circuit while compressor is running Compressor Test Cord for PSC Compressor Compressor Test Cord for PSC Compressor Circuit breaker or fuse rated for compressor full load amps To COMMON C terminal on compressor Hot line for 115V test Ground Wire To compressor shell 115V plug Neutral line for 115V test To RUN R terminal on compressor To START S terminal on compressor Capacitor rated for compressor Compressor Test Cord for Split Phase Compressor Compressor Test Cord for Split Phase Compressor Circuit breaker or fuse rated for compressor full load amps To COMMON C terminal on compressor Hot line for 115V test Ground Wire To compressor shell 115V plug Neutral line for 115V test To RUN R terminal on compressor To START S terminal on gc compressor Depress momentary on start switch Release when compressor starts Capacitor rated for compressor if used Running Capacitors
28. difier must be plugged into a 115 Volt 60 Hz AC only electrical outlet The circuit should be protected by a 15 Amp circuit breaker or 15 amp time delay type fuse CAUTION If voltage varies by 10 of 115 volts performance of the Dehumidifier may be affected Operating the Dehumidifier with insufficient power can damage the compressor The Dehumidifier power cord is equipped with a three prong grounding plug It must be plugged directly into a properly grounded three prong receptacle The receptacle must be installed in accordance with local codes and ordinances A power cord about 6 feet long permits locating a unit suitably in most homes without the use of an extension cord An extension cord can become a shock hazard if it rests on a damp floor or if water spills on it Do not use an extension cord or an adapter plug Compressor Information There are two types of compressors used on Dehumidifiers Low Side Reciprocating Piston Compressor High Side Rotary Compressor This compressor operates with low side or suction pressure within the compressor shell Refrigerant vapor from the evaporator is drawn into the shell to cool the motor windings before being compressed High pressure vapor is This compressor draws low pressure refrigerant vapor from the evaporator directly into the compression chamber High pressure vapor is discharged into the compressor shell where it picks up excess motor heat before passing into di
29. emperature drops to 37 F bury thermostat in bucket of ice With multimeter still connected to two thermostat leads watch resistance scale to see if it goes to maximum when temperature drops to 37 F Place thermometer in ice bucket to monitor exact temperature at which thermostat opens 3 Replace thermostat if readings are not within limits NOTE When replacing the thermostat make sure the insulation is wrapped firmly around the thermostat to prevent heat loss Motor Motor Bracket and Blower Wheel The shaded pole Fan Motor can be single or two speed depending on the model The motor turns a Blower Wheel 7 L x 2 W rather than a fan blade This motor does not have a Start winding but instead employs a shading coil in the stator to produce starting torque in the proper direction When the motor speeds up the shading coil does not affect the motor s operation The fan motor is permanently lubricated However some motors have oil ports and should be oiled after two years of service To Remove Blower Assembly 1 Disconnect dehumidifier from electrical supply NOTE Refer to procedures on page 6 to remove bucket front grille top cap and wrapper 2 Remove bucket front grille top cap and wrapper 3 Remove four screws from motor bracket See Figure 9c 4 Pull blower assembly towards you and lift up and out of unit See Figure 9d Figure 9c Figure 9d 5 Disc
30. igure 8d NOTE This unit will not operate with the bucket removed Float Figure 8c Figure 8d To Remove Float 1 Disconnect dehumidifier from electrical supply 2 Remove bucket See procedure To Remove Bucket on page 6 3 Drain any condensate that may be in the bucket 4 Remove pin holding float to bucket See Figure 6e 5 Remove float through top access hole in bucket 6 Reverse procedure to reassemble Figure 8e NOTE When reinstalling float into bucket ensure the float is positioned so the tongue protrudes through the front hole in the bucket Then the pin is inserted through the hole in the tongue and snapped into the slot in the bucket To Remove Bucket Switch 1 Disconnect dehumidifier from electrical supply 2 Remove three electrical leads from terminals on bucket switch 3 Squeeze tabs together and push up on switch from bottom See Figure 8f Figure 8f To Test Bucket Switch 1 Test resistance between three terminals on switch See Figura 2 Using Multimeter on resistance scale with switch in AT REST position resistance readings should be as follows Common Normally Open Max resistance Common Normally Closed Zero resistance With switch arm DEPRESSED readings should be as follows Common Normally Open Zero resistance Common Normally Closed Max resistance 3 Replace switch if readings are not within range NORMALLY OPEN 2 NORM
31. ir contains less moisture and is warmer its relative humidity is lower This drier air is expelled through the side grille and mixes with the room air Place the Dehumidifier on a level surface with all four casters resting firmly on a solid floor Since the dehumidifier draws in air through the front grille and exhausts out the left side louvers the unit may be positioned against a wall but care should be taken not to obstruct this air flow with furniture walls etc Maintain at least 2 feet clearance at left side and front Shut all doors and windows to the area to be dehumidified For the first operation turn the Humidity Control to the MAX position This aids moisture removal from furnishings as well as room air When you feel a desired level of dryness has been reached adjust the Humidity Control to your particular comfort level Prior to emptying the bucket turn the Dehumidifier OFF and disconnect the power cord This eliminates any possibility of electrical shock if you spill water and there is a fault in the grounding system of the unit or your home wiring Ensure the area the Dehumidifier and you are dry before reconnecting the power cord A light coating of frost on the coil is normal when the Dehumidifier is first turned ON Under normal conditions it will disappear in 30 to 45 minutes If it doesn t disappear shut if off and wait for it to defrost before running again Electrical Information The Dehumi
32. ition from a system and store it in an external container without necessarily testing or processing it in any way Recycling toclean refrigerantfor reuse by oil separation and single ormultiple passes through devices such as replaceable core filter driers which reduce moisture acidity and particulate matter This term usually applies to proce dures implemented at the field job site or at a local service shop Reclaim to reprocess refrigerantto new product specifications by means which may include distillation Will require chemi calanalysis ofthe refrigerantto determine that appropri ate product specifications are met This term usually implies the use of processes or procedures available only at a reprocessing or manufacturing facility SAFETY WARNINGS CompressorTesting Whenevertesting a compressor extreme caution should be used to prevent damaging the terminals A compres sor with a damaged terminal or a grounded winding can expel a terminal from its insulated housing when the compressor is energized If this happens a mixture of refrigerant and oil will be released that could be ignited by an external heat source open flame heater Also if there is air in the system when this happens a spark at the compressor shell could ignite the refrigerant and oil mixture Charging Sealed Systems Overcharging a refrigeration system with refrigerant can be dangerous If the overcharge is sufficient to immerse the majo
33. l Assembly 1 Disconnect dehumidifier from electrical supply NOTE See Figure 7b for location of electrical wires 2 Disconnect one red and two white wires connected to Bucket Full Light One of the white wires is pigtailed to the red wire on one of the terminals 3 Disconnect two black wires connected to Humidistat From Fan Motor From Fan Motor From Defrost Control From Bucket Switch From Common 4 Disconnect two black wires and one red wire connected to Fan Speed Switch Only on two speed models 5 Remove control assembly 6 Reverse procedure to reassemble To Remove Humidistat 1 Disconnect dehumidifier from electrical supply 2 Remove control knob from front of control assembly 3 Disconnect three black wires connected to two terminals on Humidistat 4 Pull back on four tabs to release the humidistat See Figure 7c Pull back on top tabs first tilting humidistat towards you then pull back on bottom tabs and pull humidistat free from assembly 5 Reverse procedure to reassemble Figure 7c BLACK Figure 7b Comp Junction RED Humidistat Fan Speed Switch VOCCM Fan Motor To Remove Full Bucket Pilot Light 1 Disconnect dehumidifier from electrical supply 2 Disconnect three wires connected to two terminals on pilot light See figure
34. lity to complete it in a safe and satisfactory manner Before servicing or moving an appliance Remove the power cord from the electrical outlet trip the circuit breaker to the OFF position or remove the fuse Turn off the gas supply Turn off the water supply Never interfere with the proper operation of any safety device USE ONLY REPLACEMENT PARTS CATALOGED FOR THIS APPLIANCE SUBSTITUTIONS MAY DEFEAT COMPLIANCE WITH SAFETY STANDARDS SET FOR HOME APPLIANCES GROUNDING The standard color coding for safety ground wires is GREEN or GREEN with YELLOW STRIPES Ground leads are not to be used as current carrying conductors It is EXTREMELY important that the service technician reestablish all safety grounds prior to completion of service Failure to do so will create a hazard Prior to returning the product to service ensure that All electrical connections are correct and secure All electrical leads are properly dressed and secured away from sharp edges high temperature components and moving parts All non insulated electrical terminals connectors heaters etc are adequately spaced away from all metal parts and panels All safety grounds both internal and external are correctly and securely connected All panels are properly and securely reassembled WARNING This service manual is intended for use by persons having electrical and mechnical training and a level of knowledge of these subjects generally considered a
35. ly measure this however you do not want dry fit or loose fit Tubing joints should overlap about distance of their diameter except for restrictor tubes which should be inserted 1 25 Clean all joint areas with fine steel wool or preferably abrasive cloth such as grit cloth No 23 or Scotch Brite Apply thin film of liquid flux recommended for silver soldering to surfaces to be joined and to surfaces immediately adjacent to joint Align tubing so no stress is on joint Do not move tubing while solder is solidifying or leaks will result CAUTION During application of heat use wetcloths to prevent heat from conducting to areas other than soldered joint Use a sheet of metal as a heat deflector to keep flame away from flammable materials and painted surfaces Use torch of adequate capacity so joint can be quickly heated with minimum of heat travel to other points Use good grade of silver solder Solder connections If tubing is properly cleaned and fluxed solder will flow readily Use only enough solder to make a good bond Allow joint to cool then wash exterior with water to remove flux SEALED SYSTEM Thedehumidifying system is similiar to that of a room air conditioner except for size The condenser and evaporator are both fin and tube coils of copper tubing with aluminum fins Both coils are placed in the air stream A capillary tube controls the refrigerant flow from the condenser to the
36. nts After servicing a system always leak test the entire System especially new joints before final recharging Clean off any soldering flux if used from the joints before leak testing as flux can seal off pinhole leaks that would show up later COMPONENT REPLACEMENT CAUTION It is extremely important to verify the type of refrigerant in a system before starting any sealed system repair Check serial plate for the correct refrigerant type and charge When replacing components all copper joints must be joined with silver solder or Sil Fos CAUTION Be careful not to damage adjacent parts when using a torch on soldered joints If necessary use a metal heat shield or wrap a wet cloth around the tubing to reduce heat transfer COMPRESSOR REPLACEMENT CAUTION NEVER install a new compressor without first checking for possible system contamination Tocheck for contamination obtain an oil sample from an old compressor Ifoil has burned odor but no color change or residue follow instructions in section Installing A New Compressor page 14 foilhas burned odor and shows contamination dark color or feels gritty follow instructions in next section To Flush The System Remove as much contamination as possible from system before installing new compressor To Flush The System NOTE The system should be flushed with dry nitrogen However you must use R
37. onnect three wires going to the Control To Remove Casters Assembly 1 Disconnect dehumidifier from electrical supply 6 Use pair of pliers to remove compression clamp 2 ay humidifier on floor front grille facing up holding blower wheel to motor shaft See Figures Use a hammer and screwdriver to release locking 10 and 10d tabs securing casters to base See Figure 10c 7 Pull blower wheel off of motor shaft and free from 4 Reverse procedure to reassemble blower assembly Figure 10c Blower Assembly M ij Figure 10 Blower Wheel Scroll Chassis Assy Figure 10d 8 Lift off styrofoam scroll chassis 9 Toremove motor from motor bracket remove two hex head nuts holding motor to bracket 10 Reverse procedure to reassemble NOTE When reassembling blower wheel to motor shaft make sure blower wheel is pressed onto shaft as far as it will go To Test Motor 1 Using an ohmmeter take resistance readings of HI and LO speed windings Readings should be as follows LO Speed Red amp White leads 450 10 HI Speed Black amp White leads 30Q 10 2 If readings are not within limits replace motor 10 Compressor There are two types of compressors used on dehumidifiers 1 Permanent Split Capacitor compressor Rotary 2 Split Phase compressor Reciprocating Permanent Split Capacitor
38. ow side Close compound gauge Run compressor for few minutes and leak test high side When leak is found recapture refrigerant using EPA approved recovery system repair and go back to step 1 Charging The System CAUTION After charging the system with liquid be certain to wait at least 5 minutes before starting the compressor to give the refrigerant a chance to disperse throughout the system Otherwise the compressor could be damaged by attempting to pump excessive quantities of liquid Preparing the Charging Cylinder 1 Charging cylinder must have at least eight ounces more refrigerant than required charge 2 Plug in cylinder heater and bring pressure up to 30 pounds above gauge pressure at ambient temperature Maintain but do not exceed this 30 pound increase in gauge pressure during system charging WARNING DO NOT USE EXTERNAL HEAT SOURCE ON CYLINDER OR EXCEED MAXIMUM GAUGE PRESSURE ON CHARGING SYSTEM To Charge System 1 Make certain that hand shut off valve to vacuum pump is closed 2 Setcharging cylinder scale to pressure indicated on cylinder pressure gauge 3 Observe refrigerant level in sight glass Subtract amount to be charged into system and note shut off point 4 Opencharging cylinder valve slowly and allow proper charge to enter system 5 As soon refrigerantin sight glass has gone down to predetermined level close charging cylinder valve WARNIN
39. permit the water to flow into the hose or drain To return to bucket collection the hose connection may be closed with a standard threaded cap To Remove Bucket 1 Disconnect dehumidifier from electrical supply 2 Pull bucket toward you releasing actuator from float assembly See Figures 6a and 6b 3 Reverse procedure to complete repairs To Remove Front Grille Screws nn Float Actuator Top Cover Screws e PEE 2 Hole for 4 Grille screw Rear of Dehumidifier Holes for pins Figure Figure 6c Remove Wrapper 1 Disconnect dehumidifier from electrical supply 2 Remove two screws at lower front of grille See Figure 6b Note Bucket must be removed to gain access to these screws 3 Remove two screws in upper holes in rear of cabinet flange See Figure 6d 4 Pull grille toward you so the two pins on each side of grille will pull free of holes in cabinet See Figure 6c and 6d 5 Pull grille down to release from top cover 6 Reverse procedure to reassemble 1 Disconnect dehumidifier from electrical supply 2 Remove front grille and top cover 3 Remove 14 screws from wrapper as shown in Figures 6e and 6f To Remove Top Cover E 1 Disconnect dehumidifier from electrical supply 0 11 2 Remove front grille Se 1 3 Remove two screws on rear of dehumidifier holding top cover to cabinet See Fig
40. r parts of the motor and compressor in liquid refrigerant a situation has been created which when 13 followed by a sequence of circumstances can lead to the compressor shell seam separating A hydraulic block then occurs preventing the compres sor from starting This condition is known as locked rotor Electric current continues to flow through the compressor motor windings which become in effect electric resistance heaters The heat produced begins to vaporize the excess refrigerant liquid causing a rapid increase in system pressure If the compressor protective devices fail the pressure within the system may rise to extremes far in excess of the design limits Under these conditions the weld seam around the compressor shell can separate with explosive force spewing oil and refrigerant vapor which could ignite To eliminate this exceedingly rare but potential hazard never add refrigerant to a sealed system If refrigerant is required evacuate the existing charge and recharge with the correct measured amount of the refrigerant specified for the system SOLDERING WARNING WEAR APPROVED SAFETY GLASSES WHEN WORKING WITH OR ON ANY PRESSURIZED SYSTEM OR EQUIPMENT HAVE AN APPROVED DRY TYPE FIRE EXTINGUISHER HANDY WHEN USING ANY TYPE OF GAS OPERATED TORCH 1 All joints to be soldered must have proper fit Clearance between tubes to be soldered should be from 001 to 006 It is not practical to actual
41. replace NOTE Priorto reassembling condenser and evapo rator the gap aound right and left srew hole brackets must be sealed with Permagum See Figure 16a Figure 16a 10 Reassembleinreverse order Filter Dryer Dehumidifiers are not equipped with a filter dryer butas a servicer if you feel you need afilter dryer in this system after doing your repair a filter dryer is available through the Replacement Parts System EVACUATING AND RECHARGING Equipment Needed Heated Dial A Charge charging cylinder Standard 3 port manifold gauge set four charging hoses Tee fitting with valve core stem removed Robinair No 40396 Handshut off valve Robinair No 40380 Two stage vacuum pump Process tube adapter kit Robinair No 12458 Tubing cutter Pinch off tool capable of making leak proof seal Complete brazing torch set Small 3 corner file Grit cloth or Scotch Brite 45 silver solder and flux or sil floss Installing Evacuation and Recharging Equipment 1 Disconnect dehumidifier from electrical supply 2 Install process tube adaptor on process tube leaving as much tube as possible 3 Attach refrigeration service gauge manifold to system in following order Low side compound gauge to process tube Center port manifold hose before hand shut off valve to charging cylinder Center port manifold hose after hand shut off valveto vacuum pump Evacuating System Toachieve the required levels of ev
42. scharged directly into the condenser the condenser NOTE Rotary compressors take longer to start the refrigeration process than reciprocating compressors after an extended down time The reason is that while the temperature of the evaporator and condenser change with the fluctuation of the ambient temperature neither type of compressor can provide a temperature stable mass And since all of the refrigerant in the system condenses in the compressor shell during extended idle periods the high side rotary compressor depends upon heat generated by the motor and compressor to vaporize the refrigerant and pump it through the system On the other hand the low side reciprocating compressor quickly lowers the pressure on the liquid causing it to vaporize faster and immediately pump it through the system CAUTION Replacement compressors are charged with oil at the factory Care should be exercized when replacing a compressor to avoid spilling any oil Rotary compressor hold down nuts must be torqued to 50 in Ibs to prevent loosening The motor for the Rotary compressor is a Permanent Split Capacitor PSC motor with Start and Run windings A capacitor is wired in series with the Start winding When power is applied the capacitor assists in bringing the compressor motor to optimum speed The motor for the Reciprocating compressor is a Split Phase This compressor has a Start and Run winding with a current activated relay or PTC
43. toil charge anda holding chargeofinertgas Modelswith Reciprocating Compressors have a low side process tube attached to the compressor shell Models with Rotary Compressors have a process tube on the high side of the System soldered into the compressor discharge line WARNING OPERATE COMPRESSOR WHEN CHARGING LIQUID REFRIGERANT INTO SYSTEM THROUGHITS PROCESS TUBE CAUTION Use extreme care when using dry nitrogento flushsystems Pressure in nitrogen cylinder could be as high as 2000 psi Nitrogen cylinder must be equipped with approved pressure regulator and pressure relief valve Ensure that your hoses have adequate ratings for pressure involved and that all of your equipment is in good condition Before installing the replacement compressor remove the discharge plug and check for the pop sound of the inert gas leavingthecompressor CAUTION DO NOT use compressor if you do not hear this sound Anew compressor which is cold e g after having been kept inacoldservice van should be lefttowarm tothe surrounding temperature before the plugs onthe compressorconnections areremoved Thiswillhelppreventcondensationfromforming inthe oil and the compressor Also avoid opening the system when any of the components or lines are cold CAUTION Release holding charge release slowly to avoid oil discharge on new compressor to ensure thatthere is noleakinseam ortubing Then reinstall ru
44. ure 6d 4 Slide cover to rear to release tabs from flange Figure 6e Figure 6f 4 Grasp wrapper on its left and right sides pulling outward then pull toward you and lift free of dehumidifier 5 Reverse procedure to reassemble NOTE The Control Assembly is attached to the top cover This must be removed before the top cover can be lifted up and off of the unit 5 release the Control Assembly from the top cover press in on the four tabs on the underside of the top cover See Figure 6g Electrical wires are still connected to assembly so be careful 6 Lift cover up and off 6 Reverse procedure to reassemble Tabs Figure 69 Control Assembly The overlay of the Control Assembly for the two speed models displays an Humidity Control Switch humidification min to max range Fan Speed Switch and LO and a Bucket Full LED See Figure 7a1 On single speed model there is no Fan Speed Switch See Figure 7a2 A Humidistat cycles both the fan and compressor ON or OFF to maintain humidity at the set level The humidity sensing element is a nylon film which stretches with increased humidity and contracts with decreased humidity This action turns a switch in the control ON and OFF to cycle the unit Humidity Control A la M FRIGIDAIRE Full Fan Speed Bucket lom hi rx Figure 7a1 BS FRIGIDAIRE Figure 7a2 To Remove Contro
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