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Duo-Therm 39125, Service Manual

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69

Section D - Configuration, cont’d.

ZONE 1

 configuration should have Dip switch 1 (heat

strip) to ON position and all other Dip switches to OFF
position. The cold (freeze) control should be plugged
into P5 (blue) connector on the AC power module
board.

FIG. D29

Note:

 If a remote sensor is used, it must be plugged into

the P4 (white) connector.

Improper connections can cause component
damage.

FIG. D30

FIG. D31

C

OMMUNICATIONS

LINE

Manual 

Compliments 

of 

Northwest 

RV 

Supply 

 

Printed 

From 

 http://www.nwrvsupply.com

Summary of Contents for 39125

Page 1: ...y instructions for making accurate analysis of certain conditions Provided is a comprehensive guide designed to lead a qualified mechanic through the Service Manual to locate and solve symptoms that may occur Dometic continues their commitment to providing the most up to date information about servicing Duo ThermAir Conditioners and Heat Pumps Form No 3108892 013 10 00 2000 The Dometic Corporation...

Page 2: ...apacitor Fan Run C2 28 Capacitor Start C3 28 PTCR Device or Start Relay C4 29 Compressor C5 29 Overload Protector C6 30 Cold Freeze Control C7 30 Electric Heat Strip C8 30 Selector Switch C9 31 Changeover Thermostat C10 32 Remote Sensor C11 32 Ambient Sensor C12 33 Reversing Valve C13 34 Transformer C14 34 Fuse C15 34 Relay C16 35 Printed Circuit Board C17 38 Thermostat C18 42 Cable Assembly C19 5...

Page 3: ...of 0 250 Amps To check DC volts first check the voltage between the red 12 positive and black 12 negative at the connections on the Analog Control Box on the roof top unit FIG A1 If a furnace is to be operated by the Analog Control Sys tem the furnace thermostat leads are connected to the blue white striped wires out of theAnalog Control Box The furnace wires can be connected to either wire as pol...

Page 4: ...cated in the Installation and Operat ing Instructions Check the air filters and clean Section A Installation cont d A6 Ducting A6a Rooftop Units Sizing and Design The installer of this air conditioner system must design the air distribution system for his particular application Sev eral requirements for this system MUST be met for the air conditioner to operate properly These requirements are as f...

Page 5: ...ening must be framed to seal off the roof cavity Holes used to route electrical wir ing should be sealed The 14 1 4 x 14 1 4 1 8 open Section A Installation cont d ing is part of the return air duct and must be finished in accordance with NFPA Standard 501C Standard for Rec reational Vehicles Section 2 7 The most commonly found installation problem is the im proper sealing of the 14 1 4 x 14 1 4 1...

Page 6: ...ng b The power supply MUST be on a separate Time Delay Fuse or HACR Circuit Breaker c Make sure at least 15 of supply wire extends into the roof opening This ensures easy connection at the Junction Box d Wiring must comply with all National State and Local Wiring Codes e Use a steel sleeve and a grommet or equivalent meth ods to protect the wire where it passes into the open ing Route a dedicated ...

Page 7: ...eil ing material A gasket etc must be used to fill up the open space to reduce recirculation See FIG A9 Another method of connecting the discharge air to the coach s main duct used Duo Therm s return air kit It uses half of the 14 1 4 x 14 1 4 1 8 opening as a discharge plenum If the duct opening is not clean restriction of air can cause the coil to freeze The opening of the duct should be as larg...

Page 8: ... Therm air conditioner requires a mini mum of 40 square inches of FREE AREA FREE AREA is the opening that remains in a grill or lou vered panel after the restrictions are taken away For ex ample an opening of 10 x 20 inches has 200 square inches When this opening is covered with a grill that is 56 percent open the FREE AREA is 200 x 56 112 square inches Dometic return air kits are designed to have...

Page 9: ...w temperature switch that will shut off the compressor and allow air to flow through the coil to melt the frost A properly operating cold control may allow a slight coating of frost to form on the evaporator coil be fore it turns off the compressor If the cold control is not installed in its intended mounting locations frost buildup can block all air flow through the evaporator coil and stop cooli...

Page 10: ...emove Hang Tag 600 SERIES 579 590 595 SERIES FIG A21 FIG A20 Mount the Freeze Control on left side of coil with wires to the right side Install Freeze Control with wires as shown Freeze Control Installation 600 Series a Snap the freeze control into place on return end lo cated at right side of evaporator coil as follows 1 Locate vertical return bend at lower right of evapo rator coil 2 Place the h...

Page 11: ...e minimum clearances to the evaporator are zero inches to the bottom top left and right sides Access to the elec trical connections and drain connection must be provided when making the installation Be sure to allow sufficient room to service the electrical components Inlet Air The evaporator section must have free access to room air A minimum or 180 square inches of FREE AREA open ing is required...

Page 12: ...ehicle Special care must be taken to prevent the discharge air from recirculat ing to the inlet of the condenser coil Shields should be added to ensure fresh air supply Do not install the condenser where the fan will draw air from the exhaust of the vehicle a motor generator set transmission road heat or ANY other heat producing source FIG A23 FIELD INSTALLED SHIELD THAT WILL PREVENT RECIRCULATION...

Page 13: ...eturn air must be provided through louvers or mesh screen the FREEAREA percent age of the material used shall be taken into consideration when making this determination An example of how to determine FREEAREAis included under Condenser Sec tion See FIG A24 Supply Duct must be insulated Supply Duct from air conditioner must be equal to or greater in IN 2 as the floor ductwork Use 45 degree angle on...

Page 14: ...e space These improvements have generated complex interior space requirements which in turn have caused many RV s to become a maze for heating and air conditioning circula tion The heating system is usually mounted close to floor level and consists of one or more furnaces The air conditioner s is mounted on the roof with a different air distribution sys tem It is very important to locate the therm...

Page 15: ...itioning should be tested especially when using different duct systems and the same thermostat When the proper thermostat or re mote sensor location is determined this location can be used on other RV s with the same basic plan See FIG A27 FIG A27 Example of Good Thermostat Location Interior Hallway Wall M a n u a l C o m p l i m e n t s o f N o r t h w e s t R V S u p p l y P r i n t e d F r o m ...

Page 16: ... satisfies your needs See FIG B1 a HIGH COOL Selected when maximum cooling and dehumidification is required b MED COOL Selected when normal or average cooling is required c LOW COOL Selected when room is at desired comfort level and needs to be maintained Nor mally this speed is used for nighttime operation Note The blower runs continuously to circulate air and maintain an even temperature The com...

Page 17: ...ion and Auto On Switch is in the ON position the air con ditioner fan will run continuously to circulate the air in side the RV See FIG B2 B1c Analog Control System In order to familiarize yourself with the operation of the Analog Control System the following diagrams along with the accompanying text will explain all the functional char acteristics of the system FIG B2 FIG B3 B1b Bimetal Relay Con...

Page 18: ...ssible available fan speeds are LOW MEDIUM HIGH and AUTO To select the desired fan speed momentarily depress the FAN push button You will need to continue to depress and release the FAN button until the desired fan speed is shown in the LCD readout area of the Comfort Control Center See FIG B4 Mode Selector Button Modes of operation available are OFF FAN ONLY COOL HEAT PUMP FURNACE STAGE and HEAT ...

Page 19: ...W MED HIGH AUTO is illuminated If your vehicle is equipped with a heat pump or a dual basement air conditioning system your selection choice will be LOW HIGH or AUTO 4 After approximately 5 seconds the selected fan speed will come on The MODE and FAN speed you have selected will remain shown in the LCD area of the Con trol Center until you change your selection 5 If the vehicle contains more than ...

Page 20: ... Therm Heat Pumps See FIG B7 1 Momentarily depress and release the MODE push button until the COOL indicator on the LCD is illuminated 2 Depress and release the FAN push button to select your desired fan speed 3 Depress and release the UP push button to increase the temperature or the DN push button to decrease the desired temperature The final selected SETPOINT will be displayed in the LCD area o...

Page 21: ...ted 5 If the vehicle contains more than one ZONE depress the FAN and MODE push buttons simultaneously to select ZONE 2 and repeat procedures from Step 1 above Repeat entire procedure for each additional zone 68 FIG B8 Furnace Mode Operation If the vehicle is equipped with a gas furnace connected to the Comfort Control Center See FIG B9 1 Momentarily depress and release the MODE push button until t...

Page 22: ...lly run in the LOW speed FAN ONLY MODE In the FAN ONLY mode the fan automatically runs in the LOW speed Refrigerant Compressor Time Delay A time delay of approximately two minutes occurs any time the compressor is required to begin the cooling or heat pump cycle Power Interruption In the event that power to the air conditioner or control is interrupted the system will restart with the same setting...

Page 23: ...in the HEAT PUMP mode if the outside ambient temperature is measured to be below 24 F the control will automatically select the FURNACE operation When this happens the AUX HEAT and the HEAT PUMP indicators on the LCD will illuminate Once the outside ambient tem perature is measured above 34 F the control will return to the HEAT PUMP operation If your vehicle does not con tain a furnace and you hav...

Page 24: ...mp heating uses campsite electrical hookup and saves on trips to refill L P tanks 3 When used in mild climates where the outdoor tem perature range is 40 degrees or higher an LP furnace is not needed The heat pump operates in two different modes cooling and heating The same mechanism is used for both cycles but the travel or flow of refrigerant is reversed to change from cooling to heating The ite...

Page 25: ...his first air flow is established to pass over both coils inside and outside Next a refrigerant cycle is established to cause the refrigerant R22 to flow through the coils The refrigerant cycle starts at the compressor Its function is to take the low pressure R22 vapor and discharge it as high pressure vapor As the refrigerant R22 is com pressed it gives off heat causing the discharge line to be q...

Page 26: ...allows the refrigerant pressure to equalize and compressor to restart easily Section B Operation cont d Fan Operation This will circulate the air in your RV without cooling or heat ing There are two positions HIGH FAN or LOW FAN to select from depending upon personal choice Heating Operation Note This heat pump will not replace a furnace for heating your RV in cold weather The intent is to remove ...

Page 27: ...ing the fan speed switch 4 to a High speed Selected for maximum air flow The discharge air will feel cool b Low speed Selected normally for heat pump op eration The lower air flow allows it to feel warmer B2c Analog Control System In order to familiarize yourself with the operation of the Analog Control System the following diagrams along with the accompanying text will explain all the functional ...

Page 28: ...l operate continuously at the fan speed selected by the Fan Speed Switch 4 3 Select desired fan speed by moving the Fan Speed Switch 4 to a High Speed Selected when maximum air flow is required The discharge air will feel cool due to the maximum air flow It is normally not used for heat pump operation b Low Speed Normally selected for heat pump op eration because less air movement is needed for he...

Page 29: ...r module board and the run capacitor Disconnect the motor leads Set your ohm meter to its highest scale for these tests Check for continuity between the white wire and each of the other wire Lack of continuity between the white wire and any of the other wires indicates an open circuit and requires that the motor be changed Next scrape some paint off the motor casing and check for continuity betwee...

Page 30: ...ree terminals The terminals are marked F C and HERM To check the combination run capacitor follow the discharge proce dures above Again make sure you test from C com mon to F fan and C common to HERM compres sor C3 Start Capacitor The unit will have one of two types of start capacitor One type has a 15 000 ohm resistor between the terminals The other type does not have the resistor There may be a ...

Page 31: ...ng to be done by a qualified service technician The second check to take is an amperage reading Clamp an ammeter around the wire from the PTCR to the capaci tor Turn the air conditioner circuit breaker to ON and start the air conditioner When the compressor starts there will be an amperage reading for approximately one second or less If there is no reading or if there is a prolonged read ing the P...

Page 32: ...air condition ers ONLY If used with roof top heat pumps it can cause premature shutoff of the compressor The cold control is normally open no continuity and closed when the temperature is below 41 to 49 degrees The switch will return to the open position at 52 to 62 degrees Check continuity through the switch in temperatures over 62 degrees it should show open no continuity and in tem peratures be...

Page 33: ...ested for continuity with a volt ohm meter set on the highest scale See FIG C13 Model 59126 501 First turn the 20 amp heat pump breaker to OFF Next remove the wires from the switch With the switch in the OFF position you should not have continuity between Terminal L1 and any other white numbered termi nal In the HIGH 2 FAN position you should have continu ity between Terminal L1 and Terminal 4 onl...

Page 34: ...nt d FIG C14 C10 Changeover Thermostat The changeover thermostat is a capillary tube bellows type switch Its function is to allow the compressor to operate only when outside ambient is 40 F or warmer See FIG C15 To check the changeover thermostat first verify the air tem perature at the capillary tube If the temperatures are above 45 F continuity should be between terminals 2 to 3 and no continuit...

Page 35: ...r stagnation such as under cup boards Improper location can cause improper operation of the unit such as repeated on off cycle C12 Ambient Sensor The ambient sensor is the outside air temperature sensor and is used on heat pump units only This component al lows the heat pump to operate down to 24 F See Defrost Cycle Section on page 21 for detailed information on op eration To check the ambient sen...

Page 36: ...s not proper the reversing valve assembly needs to be replaced On all other models verifyAC volts to the solenoid coil when in COOL mode If AC voltage is NOT present verify wiring is correct especially to the 6 pin terminal connector Check that the connection is completed through it Next verify power module board is correct then verify relay is correct If AC volts are present and solenoid coil is ...

Page 37: ...to complete 115 volt AC circuits to the compressor and for fan speeds The relay has a DC volt coil To check the relay first verify AC volts have been turned off to the unit Next verify the relay coil is NOT energized no DC power No continuity should exist between terminals COM to NO Energize the coil with DC volts 10 to 16 Continuity should exist between terminals COM and NO If the above checks ar...

Page 38: ... Relay SPDT single pole double throw is used on Models 39115 XXX 39325 XXX 39335 XXX and 39424 601 On Models 39115 XXX it controls HIGH and LOW FAN speeds On Models 39325 XXX 39335 XXX and 39424 601 it opens the control circuit for the fan motor when the coil is energized Note Incorrect wiring to the thermostat can energize the relay coil on heat pump models 39325 XXX 39335 XXX and 39424 601 The r...

Page 39: ...he relay is a double pole single throw and controls the fan motor in the roof mounted unit When the AUX HEAT mode is selected or the outside temperature is too cold for HEAT PUMP operation and automatically goes to auxiliary operation the relay will interrupt the circuit to the fan mo tor When COOL OFF and HEAT PUMP modes are selected the relay coil is not energized When AUX HEAT mode is selected ...

Page 40: ...sor re lay two fan relays and other components If any one of these are defective the complete relay board must be re placed The relay board completes circuits to the fan motor and compressor depending on what mode switch and tempera ture setting is on the thermostat Remove the cover from the electric box and verify the red wire is on terminal RC black wire is on terminal G blue wire is on terminal...

Page 41: ...connect the 6 pin plug connec tor from the Analog Control Box Using a 115 volt AC incandescent bulb check from termi nal 5 white common to the other terminals to determine if a particular circuit is completed through theAnalog Control Box If the circuit is completed the bulb will illuminate Terminal 1 is a blue wire and the compressor circuit Terminal 2 is a black wire and the High Fan circuit Ter...

Page 42: ...n circuit Terminal 3 is a yellow wire and is Medium Fan circuit Terminal 4 is a red wire and is Low Fan circuit Terminal 5 is a white wire and is Common 115 V Terminal 6 is a green yellow wire and is casing ground Note DO NOT use a voltmeter to do these checks as it will give erroneous readings If the circuit is completed and that component is not oper ating the problem is in the rooftop unit or t...

Page 43: ...ted the light will illuminate NO on compressor relay is a black wire and is com pressor circuit Terminal T1 is a black wire and is High Fan circuit Terminal T2 is a black wire and is Reversing Valve cir cuit This circuit is energized in cooling mode and NOT energized in the Heat Pump mode Terminal T3 is a red wire and is Low Fan circuit Note DO NOT use a voltmeter to de these checks as it will giv...

Page 44: ...the compressor In the heat pump mode the compressor will not shut off if the temperature is below 65 F unless the changeover ther mostat reaches 40 F See Section C10 page 32 If the temperature is over 90 F the compressor will not operate in the heat pump mode The reverse is true for air condi tioning operation To check the thermostat for operation turn the heat pump circuit breaker off and disconn...

Page 45: ...u should NOT have continuity between red wire to violet white black yellow or blue wires With System Switch in COOL Fan Switch in LOW AUTO and room temperature ABOVE setpoint temperature you should have continuity between red wire Pin 2 to black wire Pin 4 and yellow wire Pin 5 You should NOT have continuity between red wire to violet white or blue wires With room temperature BELOW setpoint temper...

Page 46: ...red wire to violet white black yellow or blue wires With room temperature BELOW setpoint temperature you should have continuity between violet wire Pin 1 and green wire You should NOT have continuity between red wire to violet white black yellow or blue wires With System Switch in AUX HEAT Fan Switch in LOW AUTO and room temperature ABOVE setpoint tempera ture you should NOT have continuity betwee...

Page 47: ...ment Connect G from thermostat to blue wire in con trol box Connect Y from thermostat to yellow wire in con trol box Use wire nuts to ensure good connections To check the thermostat be sure the OFF switch is all the way to the right side Next disconnect all three wires at the terminals R G and Y Next using an ohmmeter check for continuity between R and G and or Y in the following manner With room ...

Page 48: ... between RC to Y and RC to G With room tempera ture below set point temperatures no continuity should exist between RC to Y and RC to G With FAN switch to ON position continuity should exist between RC to G regard less of room temperature With HEAT OFF COOL switch in the OFF position and FAN switch in the AUTO position no continuity should exist be tween RC to Y and RC to G regardless of room temp...

Page 49: ...ture no continuity should exist between R to Y R to W and R to G With the FAN switch to ON position and the room temperature above the set point temperature con tinuity should exist between R to Y and R to G No continu ity should exist between R to W With the room tempera ture below the set point temperature continuity should ex ist between R to G and no continuity between R to Y and R to W With t...

Page 50: ... in the electric box of the air conditioner They are black yellow blue and orange The black wire goes to negative DC volt power source The yellow goes to thermostat Y terminal The blue goes to thermostat H terminal and the orange goes to thermostat G terminal The DC volt positive from the power source goes to thermostat RC terminal If a furnace is wired to the heat cool thermostat one furnace ther...

Page 51: ...To check ACTIVE ON terminals place on lead from ohm meter to RC or RH terminal and the other lead from the meter to the ACTIVE terminal With room temperature BELOW setpoint temperature you should NOT have continuity between red wire to violet white black yellow or blue wires With System Switch in COOL Fan Switch in LOW AUTO and room temperature ABOVE setpoint temperature you should have continuity...

Page 52: ... 4 and blue wire Pin 6 You should NOT have continuity between red wire to violet or yellow wires With System Switch in AUX HEAT Fan Switch in HI AUTO and room temperature ABOVE setpoint temperature you should NOT have continuity between red wire to violet white black yellow or blue wires With room temperature BELOW setpoint temperature you should have continuity between violet wire Pin 1 and green...

Page 53: ...nging from 8 38 to 17 31 VDC Early Model Terminal Identification Check for voltage between the GND terminal and 1 FAN terminal for voltage ranging from 8 38 to 17 31 VDC 2 HI FAN terminal for voltage ranging from 8 38 to 17 31 VDC 3 FUR terminal for voltage ranging from 8 38 to 17 31 VDC 4 COOL terminal for voltage ranging from 6 73 to 7 53 VDC 5 12 terminal for voltage ranging from 6 74 to 7 5 VD...

Page 54: ...gging the Comfort Control Center com munication cable into a standard telephone RJ 11 type jack Use a VOM meter and read DC volts between red and black See FIG C53 If DC power is not present or reversed polarity check the communication cable See Section C19 on page 52 If DC power is present at the RJ11 plug on the Comfort Control Center the next step is to do a reset procedure See Section B1d on p...

Page 55: ...nto the stripper slot holding cable in one hand and tool in the other hand Squeeze down on tool and pull away This will remove the correct amount of outer insulation for insertion into RJ 11 modular plug Now you are ready to insert the prepared cable into the RJ 11 modular plug When inserting cable into plug you MUST be sure that the black wire is on your left as you look at the top of the plug wi...

Page 56: ...uld be present from one wire to any other wire in the assembly Be sure to check each wire FIG C58 Model 39325 XXX and 39335 XXX Heat Pumps The cable assembly is a ten wire cable with seven of the ten wires used The thermostat end has a 10 pin flat con nector with seven positions used Pin 1 Violet Wire Pin 2 Red Wire Pin 3 White Wire Pin 4 Black Wire Pin 5 Yellow Wire Pin 6 Blue Wire Pin 7 Brown Wi...

Page 57: ...mosphere a new filter drier and evacuation is required If the unit was manufactured without a filter drier one should not be added Evacuate the refrigerant system until it is dry 500 microns or less reading on a vacuum thermistor gauge C20b Recharging Note The Clean Air Act of 1990 set guidelines in regard to recapturing or disposition of refrigerants Check with lo cal authorities for proper handl...

Page 58: ...ssure relief valve on the vacuum pump Check the blue gauge after running the vacuum pump for 10 minutes A vacuum reading of zero to 10 inches would indicate a leak in the system or the hose connections FIG C61 FIG C62 Check all hose connections for tightness If the low side gauge does no change there is a leak in the sealed sys tem Locate the leak and correct it before proceeding If the blue low s...

Page 59: ...lated 1 Use an accurate thermometer and measure the inlet air temperature to the condenser hot coil 2 Add 32 F to the above thermometer reading 3 Find the temperature that matches the total of Steps 1 and 2 on the Refrigerant Vapor Pressure Chart The pressure reading beside the temperature reading will equal the high side pressure 4 The low side pressure would be the high side pressure divided by ...

Page 60: ...essor C TERM 6 Hi Fan motor TERM 2 Compressor R TERM 7 Lo Fan motor TERM 3 Compressor S TERM 8 Reversing Valve TERM 4 Common motor TERM 9 Reversing Valve FIG C66 TERM 5 Capacitor motor Circuit 1 Circuit 2 1 Black 1 Orange 2 White 2 Gray 3 Red 3 Brown 4 White 4 White 5 Brown 5 Brown 6 Black 6 Black 7 Red 7 Red 8 Violet 8 Open 9 Violet 9 Open Example Typical Wiring Diagrams for Roof Top Air Conditio...

Page 61: ... cage if necessary C22f Installation The installation must be according to manufacturer s in structions for the specific mode The air conditioner must not be installed in a valley on the roof water may pool around the drain holes and be drawn into the air conditioner Make sure the air conditioner is tightened to the specifica tions Overtightening can cause the unit to leak Use cau tion not to dama...

Page 62: ...the unit to the roof tighten the mounting bolts only enough to compress the roof gasket 1 2 inch Overtightening of the unit can cause the base pan to bend and allow water under the drain pan See Section C22g on page 59 Once the gasket has been installed or tightened it will retain its shape It is advisable to replace the gasket when the unit is removed from the roof for any reason See FIG C70 D Co...

Page 63: ...ith rooftop air Comfort control may serve as a room temperature sensor or a remote sensor may be used One Rooftop Air Conditioner plus One Gas Furnace To configure one rooftop air conditioner plus one gas fur nace all Dip switches are OFF and the freeze control is plugged into the proper connector blue Two thermostat wires from the furnace AC power DC power and commu nication line are properly con...

Page 64: ...Two ther mostat wires from the furnace AC power DC power and communication line are properly connected to the heat pump electronic control box Section D Configuration cont d Note If a remote sensor is used it must be plugged into the P4 white connector Improper connections can cause component damage FIG D10 FIG D11 FIG D12 M a n u a l C o m p l i m e n t s o f N o r t h w e s t R V S u p p l y P r...

Page 65: ...he furnace AC power DC power and communica tion line are properly connected to the heat pump elec tronic control box Note If a remote sensor is used it must be plugged into the P4 white connector Improper connections can cause component damage FIG D13 FIG D14 FIG D15 M a n u a l C o m p l i m e n t s o f N o r t h w e s t R V S u p p l y P r i n t e d F r o m h t t p w w w n w r v s u p p l y c o ...

Page 66: ... thermostat wires from the furnace AC power DC power and commu nication line are properly connected to the heat pump elec tronic control box Note If a remote sensor is used it must be plugged into the P4 white connector Improper connections can cause component damage FIG D16 FIG D17 FIG D18 M a n u a l C o m p l i m e n t s o f N o r t h w e s t R V S u p p l y P r i n t e d F r o m h t t p w w w ...

Page 67: ...nace and cable communications lines are properly con nected to Circuit 1AC power module board in the electrical box Note If a remote sensor is used it must be plugged into the P4 white connector Improper connections can cause component damage FIG D19 FIG D21 FIG D20 DUAL BASEMENT AIR 115V AC CIRCUIT 2 115V AC CIRCUIT 1 Typical installation for one com fort zone with dual basement air and one furna...

Page 68: ...l blocks 12V DC two ther mostat wires from the furnace and telephone cable com munications line are properly connected to Circuit 1 AC power module board in the electrical box Note If a remote sensor is used it must be plugged into the P4 white connector Improper connections can cause component damage FIG D22 FIG D23 FIG D24 115V AC CIRCUIT 2 115V AC CIRCUIT 1 Typical installation for one com fort...

Page 69: ...ONE For explanation purposes the 12V DC Comfort Control Center communications line and the two 2 furnace ther mostat wires are to ZONE 1 front unit ZONE 1 configuration should have all Dip switches in the OFF position and the cold freeze control plugged into P5 blue connector on theAC power module board ZONE 2 configuration should have Dip switch 5 ZONE 2 in the ON position and all other Dip switc...

Page 70: ...nected to one unit control box A second communications line must be connected between the two units control boxes Two 2 furnace thermostat wires must be routed to ONE unit For explanation purposes the 12V DC Comfort Control Center communications line and the two 2 furnace ther mostat wires are to ZONE 1 front unit FIG D27 ZONE 1 configuration should have Dip switch 1 heat strip to ON position and ...

Page 71: ...should be plugged into P5 blue connector on the AC power module board FIG D29 Note If a remote sensor is used it must be plugged into the P4 white connector Improper connections can cause component damage FIG D30 FIG D31 COMMUNICATIONS LINE M a n u a l C o m p l i m e n t s o f N o r t h w e s t R V S u p p l y P r i n t e d F r o m h t t p w w w n w r v s u p p l y c o m ...

Page 72: ...rposes the 12V DC Comfort Control Center communication line and the two 2 furnace ther mostat wires are to ZONE 1 front unit ZONE 1 Heat Pump configuration should have all Dip switches to OFF position The cold freeze control is NOT used The P5 blue connector must stay open The ambient sensor must be plugged into the P3 red connector on the AC power module board FIG D32 ZONE 2 Air Conditioner confi...

Page 73: ...ONE unit A second communications line must be connected between the two units control boxes Two 2 furnace thermostat wires must be routed to ONE unit For explanation purposes the 12V DC Comfort Control Center telephone communications line and the two 2 fur nace thermostat wires are to ZONE 1 front unit ZONE 1 configuration should have all Dip switches to OFF position The cold freeze control is NOT...

Page 74: ...lue connector must stay open The ambient sen sor must be plugged into the P3 red connector on the AC power module Note If a remote sensor is used it must be plugged into the P4 white connector Improper connections can cause component damage FIG D36 FIG D37 M a n u a l C o m p l i m e n t s o f N o r t h w e s t R V S u p p l y P r i n t e d F r o m h t t p w w w n w r v s u p p l y c o m ...

Page 75: ...ected between the two units control boxes Two 2 furnace thermostat wires must be routed to ONE unit For explanation purposes the 12V DC Comfort Control Center communications line and the two 2 furnace ther mostat wires are to ZONE 1 front unit ZONE 1 configuration should have all Dip switches to OFF position ZONE 2 configuration should have Dip switch 5 ZONE 2 to ON position and all other Dip swit...

Page 76: ... unit For explanation purposes the 12V DC Comfort Control Center communications line and the two 2 furnace ther mostat wires are to ZONE 1 front unit FIG D39 ZONE 1 configuration should have all Dip switches to OFF position The ambient sensor should be plugged into P3 red connector ZONE 2 configuration should have Dip switch 5 ZONE 2 to ON position and all other Dip switches to OFF position The am...

Page 77: ...75 Section D Configuration cont d FIG D40 FIG D41 FIG D42 M a n u a l C o m p l i m e n t s o f N o r t h w e s t R V S u p p l y P r i n t e d F r o m h t t p w w w n w r v s u p p l y c o m ...

Page 78: ...st be between rear furnace and rear air con ditioner For explanation purposes the 12V DC Comfort Control Center communications line and the two 2 furnace ther mostat wires from front furnace are to ZONE 1 front air conditioner The two 2 furnace thermostat wires from rear furnace are to Zone 2 rear air conditioner ZONE 1 configuration should have all Dip switches to OFF position and the cold freeze...

Page 79: ...77 Section D Configuration cont d FIG D45 FIG D46 M a n u a l C o m p l i m e n t s o f N o r t h w e s t R V S u p p l y P r i n t e d F r o m h t t p w w w n w r v s u p p l y c o m ...

Page 80: ... rear furnace For explanation purposes the 12V DC Comfort Control Center communications line and the two 2 furnace ther mostat wires from front furnace are to ZONE 1 front unit The two 2 furnace thermostat wires from rear furnace are to ZONE 2 rear unit ZONE 1 heat pump configuration should have all Dip switches to OFF position The cold freeze control is NOT used and P5 blue connector should remai...

Page 81: ...sition and all other Dip switches to OFF position 4 Four Comfort Zones To configure three units ZONES need to be established Refer to Section 2 3A 2 3B and 2 3C for Zone 1 Zone 2 and Zone 3 configuration 115 V AC must be to ZONE 4 unit A communication line must be between ZONE 3 and ZONE 4 units Configure ZONE 4 unit the same as other like units EX CEPT for the Dip switches Dip switch 3 ZONE 4 to ...

Page 82: ...4 Ambient Temperature C22a 59 AC Voltage A1 1 DC Voltage A2 1 Breaker A4 2 Changeover Thermostat C10 32 Wiring A3 C21 1 58 Bimetal Thermostat C18b 42 Relay C16 35 Relay Board C17a 38 Cable Assembly C19 52 Analog Control System Operation B1c 15 Ambient Temperature C22a 59 AC Volts A1 1 DC Volts A2 1 Fuse C15 34 Breaker A4 2 Changeover Thermostat C10 32 Analog Thermostat C18c 50 Analog Control Box C...

Page 83: ...t C18d 50 Analog Control Box C17b 39 Overload Protector C6 30 Compressor C5 29 Comfort Control Center System Operation B2d 26 Cable Assembly C19 52 AC Power Module Board C17d 40 Comfort Control Center C18d 52 Overload C6 30 Compressor C5 29 3 Fan Operates compressor tries to start cycles OFF and hums again or blows circuit breaker Cool or Heat Mode Mechanical Controls AC Voltage A1 1 PTCR or Start...

Page 84: ...age A1 1 PTCR or Start Relay C4 29 Start Capacitor C3 28 Fan Run Capacitor C2 28 Overload C6 30 Compressor C5 29 4 Fan operates compressor runs for a short while cycles off cycles back on hums blows circuit breaker or does not run Cool or Heat Mode Mechanical Controls Operation B2a 24 AC Voltage A1 1 PTCR or Start Relay C4 29 Start Capacitor C2 28 Fan Run Capacitor C2 28 Mechanical Thermostat C18a...

Page 85: ...elay C4 29 Start Capacitor C2 28 Fan Run Capacitor C2 28 Thermostat Location A7 12 Analog Thermostat C18d 50 Short Cycle C22i 59 Air Flow Obstruction C22j 60 Motor C5 27 Overload C6 30 Compressor C5 29 Sealed System C20 55 Comfort Control Center System Operation B2a 24 AC Voltage A1 1 PTCR or Start Relay C4 29 Start Capacitor C2 28 Fan Run Capacitor C2 28 Thermostat Location A7 12 Comfort Control ...

Page 86: ...C1 27 Analog Thermostat C18c 50 Cable Assembly C19 52 Relay C16 35 Printed Circuit Board C17b 39 Comfort Control Center System Wiring C21 58 Fan Run Capacitor C2 28 Motor C1 27 Thermostat C18d 52 Cable Assembly C19 52 Printed Circuit Board C17a 38 6 Compressor runs fan runs but on one speed only Cool or Heat Mode Mechanical Controls Selector Switch C9 31 Wiring C21 58 Motor C1 27 Bimetal Control S...

Page 87: ...truction C22j 60 Low Refrigerant Charge C20c 57 Capillary Tube Blockage C20a 55 Mechanical Thermostat C18a 42 Fan Run Capacitor C2 28 Motor C1 27 Bimetal Control System Ambient Temperature C22a 59 Air Flow Obstruction C22j 60 Thermostat Location A7 12 Low Refrigerant Charge C20c 57 Capillary Tube Blockage C20a 55 Bimetal Thermostat C18b 42 Cable Assembly C19 52 Fan Run Capacitor C2 28 Motor C1 27 ...

Page 88: ...a 59 Ducting System A6a 2 Air Flow Obstruction C22j 60 Heat Gain Heat Loss C22b 59 Thermostat Location A7 12 Cable Assembly C19 52 Fan Run Capacitor C2 28 Motor C1 27 Low Refrigerant Charge C20c 57 Capillary Tube Blockage C20a 55 Bimetal Thermostat C18b 42 Relay C16 35 Printed Circuit Board C17a 38 Analog Control System Ambient Temperature C22a 59 Ducting System A6a 2 Air Flow Obstruction C22j 60 ...

Page 89: ...r runs constantly Air Distribution Box Bimetal Control System Air Flow Obstruction C22j 60 Heat Gain Heat Loss C22b 59 Sealed System C20 55 Compressor C5 29 Analog Control System Air Flow Obstruction C22j 60 Heat Gain Heat Loss C22b 59 Sealed System C20 55 Compressor C5 29 Comfort Control Center System Air Flow Obstruction C22j 60 Heat Gain Heat Loss C22b 59 Sealed System C20 55 Compressor C5 29 1...

Page 90: ...echanical Control Operation B2a 24 Mechanical Thermostat C18a 42 Changeover Thermostat C10 32 Relay Double Throw C16k 37 Wiring C21 58 Reversing Valve C13 34 Bimetal Control System Operation B2a 24 Bimetal Thermostat C18a 42 Changeover Thermostat C10 32 Relay C16k 37 Wiring C21 58 Reversing Valve C13 34 Analog Control System Operation B2a 24 Analog Thermostat C18a 42 Changeover Thermostat C10 32 R...

Page 91: ...truction C22j 60 Thermostat Location A7 12 Analog Thermostat C18c 50 Comfort Control Center System ADB Installation A5 2 Operation B2c 25 Heat Gain Heat Loss C22b 59 Air flow Obstruction C22j 60 Comfort Control Center C18d 52 13 Insufficient cooling or heating compressor cycles off and on Duct in Ceiling Bimetal Control System Operation B2b 24 Short Cycle C22i 59 Ducting System A6a 2 Heat Gain Hea...

Page 92: ...28 Motor C1 27 Bimetal Control System ADB Installation A5 2 Air Flow Obstruction C22j 60 Blower Wheel C22e 59 Fan Run Capacitor C2 28 Motor C1 27 Analog Control System ADB Installation A5 2 Air Flow Obstruction C22j 60 Blower Wheel C22e 59 Fan Run Capacitor C2 28 Motor C1 27 Comfort Control Center System ADB Installation A5 2 Air Flow Obstruction C22j 60 Blower Wheel C22e 59 Fan Run Capacitor C2 2...

Page 93: ...e parts C22c 59 Fan Blade C22e 59 Tubing Vibration C22d 59 Reversing Valve C13 34 Bimetal Control System Loose parts C22c 59 Fan Blade C22e 59 Tubing Vibration C22d 59 Reversing Valve C13 34 Analog Control System Loose parts C22c 59 Fan Blade C22e 59 Tubing Vibration C22d 59 Reversing Valve C13 34 Comfort Control Center System Loose parts C22c 59 Fan Blade C22e 59 Tubing Vibration C22d 59 Reversin...

Page 94: ...n B2b 24 Wiring A3 C21 1 58 DC Voltage A2 1 Bimetal Thermostat C18b 42 Cable Assembly C19 52 Changeover thermostat C10 32 Analog Control System Operation B2c 25 Wiring A3 C21 1 58 DC Voltage A2 1 Analog Thermostat C18c 50 Cable Assembly C19 52 Changeover thermostat C10 32 Comfort Control Center System Operation B2b 24 Wiring A3 C21 1 58 DC Voltage A2 1 Comfort Control Center C18d 52 Cable Assembly...

Page 95: ... C19 52 Analog Control System Operation B1c 15 AC Volts A1 1 DC Volts A2 1 Fuse C15 34 Breaker A4 2 Changeover Thermostat C10 32 Analog Thermostat C18c 50 Analog Control Box C17b 39 Wiring A3 C21 1 58 Comfort Control Center System Configuration D 60 Operation B2d 26 AC Voltage A1 1 DC Voltage A2 1 Breaker A4 2 Fuse C15 34 Cable Assembly C19 52 Ambient Sensor C12 33 Comfort Control Center C18d 52 A...

Page 96: ... Comfort Control Center C18d 52 3 Fan Operates compressor tries to start cycles OFF and hums again or blows circuit breaker Bimetal Controls AC Voltage A1 1 PTCR or Start Relay C4 29 Start Capacitor C3 28 Fan Run Capacitor C2 28 Overload C6 30 Compressor C5 29 Analog Controls AC Voltage A1 1 PTCR or Start Relay C4 29 Start Capacitor C3 28 Fan Run Capacitor C2 28 Overload C6 30 Compressor C5 29 Com...

Page 97: ...8d 50 Analog Control Box C17b 39 Comfort Control Center System Operation B2d 26 Cable Assembly C19 52 Wiring A3 C21 1 58 Overload C6 30 Compressor C5 29 AC Power Module Board C17d 40 Comfort Control Center C18d 52 3 Fan Operates compressor tries to start cycles OFF and hums again or blows circuit breaker Bimetal Controls AC Voltage A1 1 PTCR or Start Relay C4 29 Start Capacitor C3 28 Fan Run Capac...

Page 98: ...itor C2 28 Fan Run Capacitor C2 28 Short Cycle C22i 59 Air Flow Obstruction C22j 60 Motor C5 27 Overload C6 30 Compressor C5 29 Sealed System C20 55 Analog Control System Operation B2a 24 AC Voltage A1 1 PTCR or Start Relay C4 29 Start Capacitor C2 28 Fan Run Capacitor C2 28 Short Cycle C22i 59 Air Flow Obstruction C22j 60 Motor C5 27 Overload C6 30 Compressor C5 29 Sealed System C20 55 Comfort Co...

Page 99: ...m Wiring C21 58 Fan Run Capacitor C2 28 Motor C1 27 Thermostat C18d 52 Cable Assembly C19 52 Printed Circuit Board C17a 38 6 Compressor runs fan runs but on one speed only Bimetal Control System Wiring C21 58 Fan Run Capacitor C2 28 Motor C1 27 Cable Assembly C19 52 Bimetal Thermostat C18b 42 Relay C16 35 Printed Circuit Board C17b 39 Analog Control System Wiring C21 58 Fan Run Capacitor C2 28 Mot...

Page 100: ...em A6a 2 Air Flow Obstruction C22j 60 Heat Gain Heat Loss C22b 59 Thermostat Location A7 12 Cable Assembly C19 52 Fan Run Capacitor C2 28 Motor C1 27 Low Refrigerant Charge C20c 57 Capillary Tube Blockage C20a 55 Analog Thermostat C18c 50 Analog Control Box C17b 39 Comfort Control Center System Ambient Temperature C22a 59 Ducting System A6a 2 Air Flow Obstruction C22j 60 Heat Gain Heat Loss C22b 5...

Page 101: ...ss C22b 59 Sealed System C20 55 Compressor C5 29 9 Unit operates in wrong mode cool Instead of heat or reversed Bimetal Control System Operation B2a 24 Thermostat C18a 42 Changeover Thermostat C10 32 Relay C16k 37 Wiring C21 58 Reversing Valve C13 34 Analog Control System Operation B2a 24 Thermostat C18a 42 Changeover Thermostat C10 32 Relay C16k 37 Wiring C21 58 Reversing Valve C13 34 Comfort Con...

Page 102: ...mfort Control Center System Operation B2d 26 Short Cycle C22i 59 Ducting System A6a 2 Heat Gain Heat Loss C22b 59 Air flow Obstruction C22j 60 Thermostat Location A7 12 Comfort Control Center C18d 52 11 Excessive cooling or heating compressor will not shut off Bimetal Controls Thermostat Location A7 12 Bimetal Thermostat C18b 42 Cable Assembly C19 52 Relay C16 35 Bimetal Control Board C17a 38 Anal...

Page 103: ...e C13 34 13 Turn to furnace no furnace operation Bimetal Control System Operation B2b 24 Wiring A3 C21 1 58 DC Voltage A2 1 Bimetal Thermostat C18b 42 Cable Assembly C19 52 Changeover thermostat C10 32 Analog Control System Operation B2c 25 Wiring A3 C21 1 58 DC Voltage A2 1 Analog Thermostat C18c 50 Cable Assembly C19 52 Changeover thermostat C10 32 Comfort Control Center System Operation B2b 24 ...

Page 104: ...stem Operation B2b 24 Ambient Temperature C22a 59 AC Voltage A1 1 DC Voltage A2 1 Breaker A4 2 Wiring A3 C21 1 58 Bimetal Thermostat C18b 42 Relay C16 35 Relay Board C17a 38 Cable Assembly C19 52 Analog Control System Operation B1c 15 Ambient Temperature C22a 59 AC Volts A1 1 DC Volts A2 1 Fuse C15 34 Breaker A4 2 Analog Thermostat C18c 50 Analog Control Box C17b 39 Wiring A3 C21 1 58 Comfort Cont...

Page 105: ...System Operation B2c 25 Wiring A3 C21 1 58 Fuse C15 34 Breaker A4 2 Analog Thermostat C18d 50 Analog Control Box C17b 39 Overload protector C6 30 Compressor C5 29 Comfort Control Center System Operation B2d 26 Cable Assembly C19 52 AC Power Module Board C17d 40 Comfort Control Center C18d 52 Overload C6 30 Compressor C5 29 3 Fan Operates compressor tries to start cycles OFF and hums again or blows...

Page 106: ...30 Compressor C5 29 Comfort Control Center System AC Voltage A1 1 PTCR or Start Relay C4 29 Start Capacitor C3 28 Fan Run Capacitor C2 28 Overload C6 30 Compressor C5 29 4 Fan operates compressor runs for a short while cycles off cycles back on hums blows circuit breaker or does not run Mechanical Controls Operation B2a 24 AC Voltage A1 1 PTCR or Start Relay C4 29 Start Capacitor C2 28 Fan Run Cap...

Page 107: ...29 Comfort Control Center System AC Voltage A1 1 PTCR or Start Relay C4 29 Start Capacitor C3 28 Fan Run Capacitor C2 28 Overload C6 30 Compressor C5 29 4 Fan operates compressor runs for a short while cycles off cycles back on hums blows circuit breaker or does not run Cool or Heat Mode Mechanical Controls Operation B2a 24 AC Voltage A1 1 PTCR or Start Relay C4 29 Start Capacitor C2 28 Fan Run Ca...

Page 108: ... System C20 55 Analog Control System Operation B2a 24 AC Voltage A1 1 PTCR or Start Relay C4 29 Start Capacitor C2 28 Fan Run Capacitor C2 28 Thermostat Location A7 12 Analog Thermostat C18d 50 Short Cycle C22i 59 Air Flow Obstruction C22j 60 Motor C5 27 Overload C6 30 Compressor C5 29 Sealed System C20 55 Comfort Control Center System Operation B2a 24 AC Voltage A1 1 PTCR or Start Relay C4 29 Sta...

Page 109: ...otor C1 27 Analog Thermostat C18c 50 Cable Assembly C19 52 Relay C16 35 Analog Control Box C17b 39 Comfort Control Center System Wiring C21 58 Fan Run Capacitor C2 28 Motor C1 27 Thermostat C18d 52 Cable Assembly C19 52 AC Power Module Board C17a 38 6 Compressor runs fan runs but on one speed only Mechanical Controls Selector Switch C9 31 Wiring C21 58 Motor C1 27 Bimetal Control System Wiring C21...

Page 110: ...tion C22j 60 Low Refrigerant Charge C20c 57 Capillary Tube Blockage C20a 55 Mechanical Thermostat C18a 42 Fan Run Capacitor C2 28 Motor C1 27 Bimetal Control System Ambient Temperature C22a 59 Air Flow Obstruction C22j 60 Thermostat Location A7 12 Low Refrigerant Charge C20c 57 Capillary Tube Blockage C20a 55 Bimetal Thermostat C18b 42 Cable Assembly C19 52 Fan Run Capacitor C2 28 Motor C1 27 Anal...

Page 111: ...a 2 Air Flow Obstruction C22j 60 Cold Control C7 30 Heat Gain Heat Loss C22b 59 Thermostat Location A7 12 Cable Assembly C19 52 Fan Run Capacitor C2 28 Motor C1 27 Low Refrigerant Charge C20c 57 Capillary Tube Blockage C20a 55 Bimetal Thermostat C18b 42 Relay C16 35 Printed Circuit Board C17a 38 Analog Control System Ambient Temperature C22a 59 Ducting System A6a 2 Air Flow Obstruction C22j 60 Col...

Page 112: ...ompressor runs constantly Air Distribution Box Bimetal Control System Air Flow Obstruction C22j 60 Heat Gain Heat Loss C22b 59 Sealed System C20 55 Compressor C5 29 Analog Control System Air Flow Obstruction C22j 60 Heat Gain Heat Loss C22b 59 Sealed System C20 55 Compressor C5 29 Comfort Control Center System Air Flow Obstruction C22j 60 Heat Gain Heat Loss C22b 59 Sealed System C20 55 Compressor...

Page 113: ...ersed Mechanical Control Operation B2a 24 Mechanical Thermostat C18a 42 Changeover Thermostat C10 32 Relay Double Throw C16k 37 Wiring C21 58 Reversing Valve C13 34 Bimetal Control System Operation B2a 24 Bimetal Thermostat C18a 42 Changeover Thermostat C10 32 Relay C16k 37 Wiring C21 58 Reversing Valve C13 34 Analog Control System Operation B2a 24 Analog Thermostat C18a 42 Changeover Thermostat C...

Page 114: ...ruction C22j 60 Thermostat Location A7 12 Analog Thermostat C18c 50 Comfort Control Center System ADB Installation A5 2 Operation B2c 25 Heat Gain Heat Loss C22b 59 Air flow Obstruction C22j 60 Comfort Control Center C18d 52 13 Insufficient cooling or heating compressor cycles off and on Duct in Ceiling Bimetal Control System Operation B2b 24 Short Cycle C22i 59 Ducting System A6a 2 Heat Gain Heat...

Page 115: ...Tubing Vibration C22d 59 Reversing Valve C13 34 Bimetal Control System Loose parts C22c 59 Fan Blade C22e 59 Tubing Vibration C22d 59 Reversing Valve C13 34 Analog Control System Loose parts C22c 59 Fan Blade C22e 59 Tubing Vibration C22d 59 Reversing Valve C13 34 Comfort Control Center System Loose parts C22c 59 Fan Blade C22e 59 Tubing Vibration C22d 59 Reversing Valve C13 34 15 Water leaks into...

Page 116: ... Wiring A3 C21 1 58 DC Voltage A2 1 Analog Thermostat C18c 50 Cable Assembly C19 52 Changeover thermostat C10 32 Comfort Control Center System Operation B2b 24 Wiring A3 C21 1 58 DC Voltage A2 1 Comfort Control Center C18d 52 Cable Assembly C19 52 Ambient Sensor C12 33 AC Power Module Board C17c 40 17 Turn to electric heat strip no operation Mechanical Controls Operation B1a 14 Selector Switch C9 ...

Page 117: ...ic heat strip no operation cont d Comfort Control Center System Configuration D 60 Operation B1d 16 Wiring A3 C21 1 58 Cable Assembly C19 52 Comfort Control Center C18d 52 AC Power Module Board C17c 40 M a n u a l C o m p l i m e n t s o f N o r t h w e s t R V S u p p l y P r i n t e d F r o m h t t p w w w n w r v s u p p l y c o m ...

Page 118: ... C19 52 Analog Control System Operation B1c 15 AC Volts A1 1 DC Volts A2 1 Fuse C15 34 Breaker A4 2 Changeover Thermostat C10 32 Analog Thermostat C18c 50 Analog Control Box C17b 39 Wiring A3 C21 1 58 Comfort Control Center System Configuration D 60 Operation B2d 26 AC Voltage A1 1 DC Voltage A2 1 Breaker A4 2 Fuse C15 34 Cable Assembly C19 52 Ambient Sensor C12 33 Comfort Control Center C18d 52 A...

Page 119: ... 40 Comfort Control Center C18d 52 3 Fan Operates compressor tries to start cycles OFF and hums again or blows circuit breaker Bimetal Controls AC Voltage A1 1 PTCR or Start Relay C4 29 Start Capacitor C3 28 Fan Run Capacitor C2 28 Overload C6 30 Compressor C5 29 Analog Controls AC Voltage A1 1 PTCR or Start Relay C4 29 Start Capacitor C3 28 Fan Run Capacitor C2 28 Overload C6 30 Compressor C5 29 ...

Page 120: ...29 Fuse C15 34 Breaker A4 2 Wiring A3 C21 1 58 Analog Thermostat C18d 50 Analog Control Box C17b 39 Comfort Control Center System Operation B2d 26 Cable Assembly C19 52 Wiring A3 C21 1 58 Overload C6 30 Compressor C5 29 AC Power Module Board C17d 40 Comfort Control Center C18d 52 3 Fan Operates compressor tries to start cycles OFF and hums again or blows circuit breaker Bimetal Controls AC Voltage...

Page 121: ... Start Relay C4 29 Start Capacitor C2 28 Fan Run Capacitor C2 28 Short Cycle C22i 59 Air Flow Obstruction C22j 60 Motor C5 27 Overload C6 30 Compressor C5 29 Sealed System C20 55 Analog Control System Operation B2a 24 AC Voltage A1 1 PTCR or Start Relay C4 29 Start Capacitor C2 28 Fan Run Capacitor C2 28 Short Cycle C22i 59 Air Flow Obstruction C22j 60 Motor C5 27 Overload C6 30 Compressor C5 29 S...

Page 122: ...9 Comfort Control Center System Wiring C21 58 Fan Run Capacitor C2 28 Motor C1 27 Thermostat C18d 52 Cable Assembly C19 52 Printed Circuit Board C17a 38 6 Compressor runs fan runs but on one speed only Bimetal Control System Wiring C21 58 Fan Run Capacitor C2 28 Motor C1 27 Cable Assembly C19 52 Bimetal Thermostat C18b 42 Relay C16 35 Printed Circuit Board C17b 39 Analog Control System Wiring C21 ...

Page 123: ... 42 Relay C16 35 Printed Circuit Board C17a 38 Analog Control System Ambient Temperature C22a 59 Ducting System A6a 2 Air Flow Obstruction C22j 60 Heat Gain Heat Loss C22b 59 Thermostat Location A7 12 Cable Assembly C19 52 Fan Run Capacitor C2 28 Motor C1 27 Low Refrigerant Charge C20c 57 Capillary Tube Blockage C20a 55 Analog Thermostat C18c 50 Analog Control Box C17b 39 Comfort Control Center Sy...

Page 124: ...System Operation B2a 24 Thermostat C18a 42 Changeover Thermostat C10 32 Relay C16k 37 Wiring C21 58 Reversing Valve C13 34 Analog Control System Operation B2a 24 Thermostat C18a 42 Changeover Thermostat C10 32 Relay C16k 37 Wiring C21 58 Reversing Valve C13 34 Comfort Control Center System Operation B2a 24 Ambient Sensor C12 33 Wiring C21 58 Reversing Valve C13 34 Comfort Control Center C18d 52 10...

Page 125: ...bstruction C22j 60 Thermostat Location A7 12 Comfort Control Center C18d 52 11 Excessive cooling or heating compressor will not shut off Bimetal Controls Thermostat Location A7 12 Bimetal Thermostat C18b 42 Cable Assembly C19 52 Relay C16 35 Bimetal Control Board C17a 38 Analog Control System Thermostat Location A7 12 Analog Thermostat C18c 42 Cable Assembly C19 52 Relay C16 35 Analog Control Box ...

Page 126: ...59 Fan Blade C22e 59 Tubing Vibration C22d 59 Reversing Valve C13 34 13 Turn to furnace no furnace operation Bimetal Control System Operation B2b 24 Wiring A3 C21 1 58 DC Voltage A2 1 Bimetal Thermostat C18b 42 Cable Assembly C19 52 Analog Control System Operation B2c 25 Wiring A3 C21 1 58 DC Voltage A2 1 Analog Thermostat C18c 50 Cable Assembly C19 52 Comfort Control Center System Operation B2b 2...

Page 127: ...36 5573 http www nwrvsupply com mail nwrvsupply com Northwest RV Supply carries a large spectrum of surplus used and new RV parts and components Please feel free to visit our website for additional information M a n u a l C o m p l i m e n t s o f N o r t h w e s t R V S u p p l y P r i n t e d F r o m h t t p w w w n w r v s u p p l y c o m ...

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