DUO-THERM COMFORT CONTROL CENTER SYSTEMS This program will address the most common system problems associated with the Duo-Therm Comfort Control Center supplied by The Dometic Corporation. Our intent is to provide you with a guideline of checks to make, should you encounter one of the following symptoms. SYMPTOM CAUSE REFER TO PAGE COMFORT CONTROL CENTER SECTION: 1. Turn to "ON" - No display.
DUO-THERM COMFORT CONTROL CENTER SYSTEMS . . . Continued SYMPTOM CAUSE REFER TO PAGE (Roof Mounted Air Conditioner Sec. continued) 11. Air distribution box unit: Insufficient cooling with reduced air output. Air Flow Obstruction Blower Wheel 10C 12C/E 38 44 12. Duct in ceiling unit: Insufficient cooling with reduced air output. Air Flow Obstruction Air Distribution System 10C 11C 38 38 13. Excessive cooling.
DUO-THERM COMFORT CONTROL CENTER SYSTEMS . . . Continued SYMPTOM CAUSE REFER TO PAGE (Roof Mounted Air Conditioner Sec. continued) 5. Compressor runs, no fan. Wiring Run Capacitor AC Power Module Comfort Control Center 5B 2C 4G/6 4G 27 35 130 127 6. Fan runs, but not on all speeds. Wiring Motor Cable Assembly AC Power Module Board Comfort Control Center 5B 1C 4G/2 4G/6 4G 27 34 128 130 127 7.
DUO-THERM COMFORT CONTROL CENTER SYSTEMS . . . Continued SYMPTOM CAUSE REFER TO PAGE (Roof Mounted Heat Pump Sec. Continued) 14. Unit operation in wrong mode (cool instead of heat pump or reversed) Operation Ambient Sensor Reversing Valve Comfort Control Center 1G 4G/4 9F 4G 100 129 95 127 15. Noisy Operation Loose Parts Fan Blades Hitting Tubing Vibration 12C/C 12C/E 12C/D 44 44 44 BASEMENT (SINGLE COMPRESSOR) AIR CONDITIONER SECTION: 1. Unit does not run; no fan, no compressor.
DUO-THERM COMFORT CONTROL CENTER SYSTEMS . . . Continued SYMPTOM CAUSE REFER TO PAGE (Basement [Single Compressor] A/C Sec. Continued) 5. Compressor runs, no fan. Wiring Run Capacitor Motor AC Power Module Board Comfort Control Center 6B 2C 1C 4G/6 4G 28 35 34 130 127 6. Fan runs, but not on all speeds. Wiring Motor Cable Assembly AC Power Module Board Comfort Control Center 6B 1C 4G/2 4G/6 4G 28 34 128 130 127 7. Evaporator freezes.
DUO-THERM COMFORT CONTROL CENTER SYSTEMS . . . Continued SYMPTOM CAUSE REFER TO PAGE (Basement [Single Compressor] H/P Sec. Continued) 2. Fan operates; compressor will not come on (does not "hum") Operation Cable Assembly Compressor AC Power Module Board Comfort Control Center 1G 4G/2 5C 4G/6 4G 100 128 36 130 127 3. Fan operates; compressor tries to start, cycles "OFF" and "hums" again, or blows circuit breaker.
DUO-THERM COMFORT CONTROL CENTER SYSTEMS . . . Continued SYMPTOM CAUSE REFER TO PAGE (Basement [Single Compressor] H/P Sec. Continued) Air Flow Obstruction Air Distribution System Blower Wheel 10C 11C 12C/E 38 38 44 10. Excessive cooling or heating. Remote Sensor AC Power Module Board Comfort Control Center 4G/5 4G/6 4G 129 130 127 11.
DUO-THERM COMFORT CONTROL CENTER SYSTEMS . . . Continued SYMPTOM CAUSE REFER TO PAGE (Basement [Dual Compressor] A/C Sec. Continued) 4. Fan operates; compressor runs for a short while, cycles "OFF" , cycles back "ON" Short Cycle Air Flow Obstruction Air Distribution System Overload Protector Compressor Refrigerant System 9C 10C 11C 6C 5C 13C 38 38 38 37 36 45 5. Compressor runs, no fan.
DUO-THERM COMFORT CONTROL CENTER SYSTEMS . . . Continued SYMPTOM CAUSE REFER TO PAGE BASEMENT (DUAL COMPRESSOR) HEAT PUMP SECTION: 1. Unit does not run; no fan, no compressor. Configuration Operation AC Voltage DC Voltage Breaker Fuse Cable Assembly Comfort Control Center AC Power Module Board 2G 1G 1B 3G 3B 4G/7 4G/2 4G 4G/6 106 100 26 127 26 133 128 127 130 2.
DUO-THERM COMFORT CONTROL CENTER SYSTEMS . . . Continued SYMPTOM CAUSE REFER TO PAGE (Basement [Dual Compressor] H/P Sec. Continued) 8. Insufficient cooling or heating; compressor runs constantly. Air Flow Obstruction Air Distribution System Heat Gain/Heat Loss Refrigerant System Compressor 10C 11C 12C/B 13C 5C 38 38 44 45 36 9. Insufficient cooling or heating with reduced air output. Air Flow Obstruction Air Distribution System Blower Wheel 10C 11C 12C/E 38 38 44 10.
DUO-THERM ROOF-MOUNTED HEAT PUMPS This program will address the most common system problems associated with the Duo-Therm Heat Pumps supplied by The Dometic Corporation. Our intent is to provide you with a guideline of checks to make, should you encounter one of the following symptoms. SYMPTOM CAUSE REFER TO PAGE 1. MECHANICAL CONTROL Unit does not run; no fan, no compressor. Operating Instructions AC voltage Breaker Selector switch Wiring 4E 1B 3B 8E 5B 60 26 26 63 27 2.
DUO-THERM ROOF-MOUNTED HEAT PUMPS . . . Continued SYMPTOM 9. MECHANICAL CONTROL Fan runs; but not on all speeds CAUSE REFER TO PAGE Selector Switch Wiring Motor 8E 5B 1C 63 27 34 10. ELECTRONIC & BIMETAL CONTROL Fan runs; but not on all speeds Wiring Motor Thermostat Relay Board Cable Assembly 11B 1C 9E/B-9E/C 12E 10E 30 34 64 71 70 11. MECHANICAL, ELECTRONIC & BIMETAL CONTROL WITH AIR DISTRIBUTION BOX Evaporator freezes up.
DUO-THERM ROOF-MOUNTED HEAT PUMPS . . . Continued SYMPTOM CAUSE REFER TO STEP 19. MECHANICAL, ELECTRONIC & BIMETAL CONTROL WITH AIR DISTRIBUTION BOX Insufficient cooling or heating; compressor often cycles off. Short Cycle 9C 38 20. ELECTRONIC & BIMETAL CONTROL WITH DUCT IN CEILING Insufficient cooling or heating; compressor often cycles off. Short Cycle Air Distribution System 9C 11C 38 38 21.
DUO-THERM BASEMENT AIR CONDITIONERS & HEAT PUMPS This program will address the most common system problems associated with the Duo-Therm Basement Air Conditioners and Heat Pumps supplied by The Dometic Corporation. Our intent is to provide you with a guideline of checks to make, should you encounter one of the following symptoms. SYMPTOM CAUSE REFER TO PAGE MODEL 390XX.XXX SECTION 1.
DUO-THERM BASEMENT AIR CONDITIONERS & HEAT PUMPS . . . Continued SYMPTOM CAUSE REFER TO PAGE (Model 390XX.XXX Section Continued) 9. 10. Excessive cooling Thermostat Wiring Relay 7F/A-7F/B 13B 14F/H 80 31 99 Noisy operation Loose Parts Tubing Vibration 12C/C 12C/D 44 44 MODEL 391XX.XXX SECTION 1. Unit does not run: No fan, no compressor Operation AC Volts DC Volts Breaker Wiring Thermostat 2F 1B 6F 3B 14B 7F/C 75 26 80 26 31 83 2.
DUO-THERM BASEMENT AIR CONDITIONERS & HEAT PUMPS . . . Continued SYMPTOM CAUSE REFER TO PAGE (MODEL 391XX.XXX SECTION CONTINUED) 7. Evaporator freezes Operation Air Flow Obstruction Air Distribution System Low Charge Capillary Tube Blockage Evaporator Blockage 2F 10C 11C 14C 14C 14C 74 38 38 47 47 47 8. Insufficient cooling, compressor runs constantly Air Flow Obstruction Air Distribution System Heat Gain/Heat Loss Refrigerant System Compressor 10C 11C 12C/B 13C 5C 38 38 44 45 36 9.
DUO-THERM BASEMENT AIR CONDITIONERS & HEAT PUMPS . . . Continued SYMPTOM CAUSE REFER TO PAGE (MODEL 393XX.XXX SECTION CONTINUED) 4. Fan operates: compressor runs for a short while, cycles "OFF", cycles back "ON" Short Cycle Air Flow Obstruction Air Distribution System Overload Protector Compressor Refrigerant System 9C 10C 11C 6C 5C 13C 38 38 38 37 36 45 5. Compressor runs: no fan Wiring Run Capacitor Motor Thermostat Relay Relay Board 15B 2C 1C 7F/E 14F/E 11F 31 35 34 87 98 96 6.
DUO-THERM BASEMENT AIR CONDITIONERS & HEAT PUMPS . . . Continued SYMPTOM CAUSE REFER TO PAGE MODEL 39224.601 SECTION 1. Unit does not run: No fan, no compressor Operation AC Voltage DC Voltage Breaker Cable Assembly Thermostat Relay 4F 1B 6F 3B 8F/A 7F/D 14F/A 76 26 80 26 94 85 97 2. Fan operates: Compressor will not come "ON" (does not "hum") Operation Cable Assembly Relay Compressor 4F 8F/A 14F/A 5C 76 94 97 36 3.
DUO-THERM BASEMENT AIR CONDITIONERS & HEAT PUMPS . . . Continued SYMPTOM CAUSE REFER TO PAGE (MODEL 39224.601 SECTION CONTINUED) 9. Insufficient cooling with reduced air output Air Flow Obstruction Air Distribution System 10C 11C 38 38 10. Excessive cooling Relay Cable Assembly Thermostat 14F/A 8F/A 7F/D 97 94 85 11. Noisy operation Loose Parts Tubing Vibration 12C/C 12C/D 44 44 MODEL 39424.601 SECTION 1.
DUO-THERM BASEMENT AIR CONDITIONERS & HEAT PUMPS . . . Continued SYMPTOM CAUSE REFER TO PAGE (MODEL 39424.601 SECTION CONTINUED) 7. Inside coil freezes Operation Air Flow Obstruction Air Distribution System Low Charge Capillary Tube Blockage Reversing Valve 5F 10C 11C 14C 14C 9F 78 38 38 47 47 95 8. Insufficient cooling or heating: Compressor runs constantly Air Flow Obstruction Air Distribution System Heat Gain/Heat Loss Refrigerant System Compressor 10C 11C 12C/B 13C 5C 38 38 44 45 36 9.
DUO-THERM AIR CONDITIONERS This program will address the most common system problems associated with the Duo-Therm Air Conditioners supplied by The Dometic Corporation. Our intent is to provide you with a guideline of checks to make, should you encounter one of the following symptoms. SYMPTOM 1. 2. 3. 4. 5. 6. MECHANICAL CONTROL Unit does not run; no fan, no compressor. ELECTRONIC CONTROL Unit does not run; no fan, no compressor. BIMETAL RELAY CONTROL Unit does not run; no fan, no compressor.
DUO-THERM AIR CONDITIONERS . . . Continued SYMPTOM CAUSE REFER TO MECHANICAL CONTROL Compressor runs, no fan. Wiring Switch Run Capacitor Motor 10B 5D/A 2C 1C 30 53 35 34 10. ELECTRONIC CONTROL Compressor runs, no fan. Wiring Run Capacitor Motor Control Board Main Board 11B 2C 1C 5D/B 5D/D 30 35 34 53 56 11. BIMETAL RELAY CONTROL Compressor runs, no fan Wiring Thermostat Relay Board Run Capacitor Motor 12B 5D/B 5D/E 2C 1C 30 53 57 35 34 12.
DUO-THERM AIR CONDITIONERS . . . Continued SYMPTOM 19. MECHANICAL, ELECTRONIC & BIMETAL RELAY CONTROL WITH AIR DISTRIBUTION BOX: Insufficient cooling; compressor cycles off occasionally. CAUSE REFER TO PAGE Thermostat Overload Air Flow Obstruction 5D/B 6C 10C 53 37 38 Overload Air Distribution System Cold Control Control Board Main Board 6C 11C 7C 5D/C 5D/D 37 38 37 54 56 Overload Air Distribution System Cold Control Thermostat Relay Board 6C 11C 7C 5D/B 5D/E 37 38 37 53 57 22.
SECTION A. THERMOSTAT LOCATION PROPER THERMOSTAT LOCATION THE THERMOSTAT LOCATION IS VERY IMPORTANT FOR BALANCED TEMPERATURE CONTROL IN AN RV. Today’s interior design of the RV has become both cosmetically more appealing and more efficient in its use of storage 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 circulation.
FIGURE 3 Example of Good Thermostat Location FIGURE 2 Examples of Bad Thermostat Locations 1, 3, 4 2 5, 6 7 Near Heat Sources Near Drafts or Heat source Near Drafts On an Outside Wall (Interior Hallway Wall) When the floor plan or interior design of an RV changes, Dometic suggests trying several locations for the thermostat or remote sensors to determine the best location for mounting.
SECTION B. AC VOLTAGE REQUIREMENTS 1B. On models 391XX.XXX, a Dc volt supply is supplied to the thermostat location: Positive (+) DC volt wires to R terminals on the thermostat; and negative (–) DC volt wires to the black wire from the unit. Polarity is crucial for proper operation. AC VOLTAGE The unit is a 115V AC, 60 Hz. appliance. The proper operation range is between 103 volts and 126.5 volts. The voltage reading should be taken at the unit power supply leads.
NOTE: BE SURE TO USE THE WIRING DIAGRAM FOR THE SPECIFIC MODEL OF UNIT YOU ARE DIAGNOSING. On rooftop units there is a 6-pin connector. Verify that all wires are tight in this connector. On some basement units there are two 9-pin connectors. Verify all wires are tight in each connector.
6B. TYPICAL WIRING DIAGRAM FOR SINGLE BASEMENT HEAT PUMP 7B.
8B.
10B. TYPICAL MECHANICAL CONTROL WIRING DIAGRAM 9B. TYPICAL UNIT WIRING DIAGRAM 115 VA C 60 HZ 1 P H USE COP PER CONDUCTORS CONDUCT ONLY ONL COMPRESSOR COMP RESSOR C MOTOR GRN/YEL R O.L. FIEL IELD D W IRING FACTORY W IRING LINE SP LICE S 6 P IN CONN BLU WHT BRN WHT FAN 2 YEL 3 3 4 2 WHT 5 1 RED 6 HERM WHT RUN CA P START CA P * BLK TO OP TIONAL ELEC HEAT BLK RED C WHT 1 WHT GRY WHT 1 GRN/YEL RED * NOT USED ON SOME MODEL S RED PTCR 3105052.
14B. TYPICAL WIRING DIAGRAM FOR MODELS 391XX.XXX 13B. TYPICAL WIRING DIAGRAM FOR MODELS 390XX.XXX 15B. TYPICAL WIRING DIAGRAM MODEL 393XX.
16B. TYPICAL WIRING DIAGRAM MODEL 39224.
17B. TYPICAL WIRING DIAGRAM FOR MODELS 39424.
SECTION C. UNIT COMPONENTS, DUCTING AND SEALED SYSTEMS 1C. BLOWER MOTOR 2. SINGLE COMPRESSOR UNITS 1. ROOFTOP UNITS The units that have a single compressor are Models: 39015.XXX 39025.XXX 39035.XXX 39045.XXX 39115.XXX 39325.XXX 39335.XXX To check the motor, turn the unit circuit breaker OFF. With an AC voltmeter, verify that the circuit has no AC voltage. Next, locate the electric box and remove its cover.
The run capacitor must be manually discharged. Using an AC voltmeter set at the 500 volt scale or higher, connect meter leads to the terminals of the capacitor. After discharging the capacitor, set the VOM meter to the highest ohm scale and connect the probes to the capacitor terminals. The reading should rapidly move toward continuity and slowly return to infinity. You should reverse the leads and repeat the procedure. If there is no reading, or a prolonged reading, replace the run capacitor.
ohms. You should then reverse the leads and check again. If there is no reading or a reading greater than 15,000 ohms, the start capacitor should be replaced. COMPRESSOR START RELAY START CAPACITOR WITHOUT RESISTOR Check this style capacitor the same way you would check the capacitor with the resistor. The reading will be different. The reading should show continuity and slowly return to infinity. Reverse the leads and check again.
6C. OVERLOAD PROTECTOR 7C. COLD (FREEZE) CONTROL An overload protector is a component that will open the AC volt circuit to the compressor if the compressor overheats due to an electrical problem. Some compressors have the overload protector built inside the compressor. This type, if defective, requires a complete compressor replacement. (Low Temperature Protection Device) The cold (freeze) control is used on rooftop air conditioners ONLY.
9C. SHORT CYCLE 11C. AIR DISTRIBUTION SYSTEM A. AIR DISTRIBUTION BOX INSTALLATIONS Short cycle is caused by cold air being drawn back into the intake side of the air conditioner before it is mixed with the warmer room air. This may cause the evaporator coil to freeze up, causing the cold control to open the circuit to the compressor. A. ROOFTOP UNITS Two possible causes of this condition are the air box and the discharge duct.
The following instructions are based upon the use of Dometic Return Air Kit. The electronic control kit has mounting bolts supplied for use with this Kit. NOTE THE DOMETIC CORPORATION WILL NOT BE HELD LIABLE FOR ROOF STRUCTURAL OR CEILING DAMAGE DUE TO IMPROPERLY INSULATED OR SEALED DUCTWORK. Before preparing the ceiling opening, the type of system options must be decided upon. If a remote sensor is to be used, provision must be made for it.
6) Route a copper 12 AWG, with ground, 115 VAC supply line from the fuse or circuit breaker box to the roof opening. a. This supply line must be located in the front portion of the 14" opening. 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.
B. BASEMENT UNITS MODELS 39335 AND 39125 INDOOR SECTION CLEARANCES The minimum clearances to the evaporator are zero inches to the bottom, top, left and right sides. Access to the electrical connections and drain connection must be provided when making the installation. OUTDOOR SECTION: The condenser coil is designed to have a fresh supply of air. If skirting is installed, allow a 15" x 22" opening (330 square inches) for supply air and a 15" x 22" opening (330 square inches) for discharge air.
NOTE: If the air conditioning unit is attached to the central furnace, a damper must be installed at the furnace outlet to prevent cold air from circulating through the furnace heat exchanger, unless furnace is so equipped to utilize the built-in furnace relay. RETURN RISER X 2 2" X 12" INSULATED DUCT (MIN.) 90 SQ. IN. FILTERED (MIN. X 2) DISCHARGE CONDENSER AIR 2" X 10" CLOSEABLE GRILL (MIN. X 4)) FLOOR CUTOUT 90 SQ. IN. MINIMUM SUPPLY AIR INSULATED FLOORING FLOOR CUTOUT 90 SQ. IN.
FREE AREA — is the opening that remains in a grill or louvered panel after the restrictions are taken away. For example, 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. CLEARANCES The air conditioning unit clearances depend on: 1. Inlet air access used; 2. Discharge air duct arrangement; 3. Return air duct; 4. Storage compartment location and design.
GRILLS D. NOTE: The return air grill must have the same square surface as the return air duct. TUBING VIBRATION If any of the copper tubing is rubbing against itself or any other part, verify that the proper tubing has been installed. DuoTherm air conditioners are designed to avoid this problem if the correct tubing is used. Replace or position tubing as necessary. 1) For each air conditioning system, there must be a return grill to bring cabin air back into the unit.
If you are going to use the braze-on processing valve, once the refrigerant has been drained, use a tubing cutter and cut the tube near the end. Do this on both the low and high side processing tubes. no water enters the evaporator section, a watertight seal must exist along the entire evaporator bulkhead which separates the two compartments. Check for sealant along this entire section and add sealant at any area where none is visible. Note that the sealed portion extends up the sides of the unit.
Open the pressure relief valve on the vacuum pump. This allows the major contaminants from the sealed system to escape into the atmosphere rather than enter the oil in the vacuum pump. At this time there should be a good, deep evacuation, or dry atmosphere inside the sealed system. Close both the low and high side valves on the compound gauge set and turn off the vacuum pump. Both the low and high side valves on the compound gauge set should be opened and the vacuum pump turned on.
A restriction in the filter-drier would cause a temperature drop at the point of the restriction. A buildup of frost or sweat could be evident if operated long enough. 14C. SEALED SYSTEM PROBLEMS One mechanical problem you may encounter is refrigerant flow restriction. There are two types of restrictions, high side and low side. The basics to use to determine a restriction are amp draw and pressure. Refrigerant leaks can occur from an improper weld, a broken line or other damage.
REFRIGERANT VAPOR PRESSURES (PSIG) Temp. Deg. F. Pressure PSIG R-22 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 43.0 44.1 45.3 46.4 47.6 48.8 50.0 51.2 52.4 53.6 54.9 56.2 57.5 58.8 60.1 61.5 62.8 64.2 65.6 67.1 68.5 70.0 71.5 73.0 74.5 76.0 77.6 79.2 80.0 82.4 84.0 85.7 87.4 89.1 90.8 92.6 94.3 Temp. Deg. F.
SECTION D. OPERATING INSTRUCTIONS The operating instructions can change from one model to another. AFTER SHUTTING THE AIR CONDITIONER DOWN WITH EITHER SELECTOR SWITCH OR THERMOSTAT, WAIT AT LEAST TWO (2) MINUTES BEFORE RESTARTING. THIS ALLOWS THE REFRIGERANT PRESSURE TO EQUALIZE AND COMPRESSOR TO RESTART EASILY. Be sure you are familiar with the proper operating instructions for the specific model of air conditioner you are diagnosing.
CONTR OL DESCRIPTION CONTROL FAN L EDs (Green) TEMPERATURE CONTROL SL IDE EXAMPLE COOLING MODE OPERATION MODE L EDs (Green) EXAMPLE MODE SW ITCH DUO-THERM DUO-THERM LOW MED 70 POWER 80 ELEC HEAT GAS HEAT FAN SWITCH 70 FAN POWER ELEC HEAT GAS HEAT AUTO GREEN L ED NEXT T O MED FAN INDICAT OR POWER SWITCH COOL 80 HI FAN AUTO 60 MED COOL HI BY DOMET IC LOW BY DOMET IC 60 GREEN L ED ON NEXT T O COOL INDICATOR TEMPERATURE SL IDE SET AT 70 DEGREES POWER SWITCH IN ON POSITION MODE
ELECTRIC HEAT MODE OPERATION (If So Equipped) Refrigerant Compressor Time Delay Delay: The compressor will always have a delay in starting of approximately two minutes any time it is required to begin the cooling cycle.
Select Auto/ON Switch operation as follows: (Lower right switch at bottom of thermostat) a. Auto Position Position: Air conditioner fan runs whenever cooling is required and stops whenever cooling is not required. b. On Position Position: Air conditioner fan runs continuously to circulate air in RV.
nals designates a defective switch, and it must be replaced. 4D. DC VOLTAGE REQUIREMENTS DC VOLTS On certain models of electronic control air conditioners, a DC volt supply is wired to the control board. The operating range is 10 to 16 volts. If voltage is below 10 volts, you could experience improper operation of the components within the main board. POSITION TERMINALS 5D.
5. 6. 7. 8. 9. Connect the "ORANGE" wire from the air conditioner to the "G" terminal on the thermostat. Push the thermostat wires into hole in wall and fill excess hole with insulation. Mount thermostat base to the wall with screws provided. Check all thermostat wires on base to ensure they are completely clear of the bimetal coil of the thermostat. Adjust if necessary. Replace thermostat cover. THERMOSTAT BASE C. CONTROL BOARD On electronic units two types of control boards have been used.
2) DC VOLT CONTROLLED NOTE NOTE: The PAL tester with the air conditioning module attached, will allow for proper testing of communication integrity between the control board and main board. The PAL and the AIR CONDITIONER MODULE are available from your Dometic parts distributor. To check the gas heat mode, verify the control board is turned on, temperature control slide is all the way to the right, mode switch is to gas heat position and green LED is on. Next, remove furnace wiring from the two blue wires.
This main board is controlled by DC volts supplied from the control board. To check DC volts, be sure OFF/ON switch on control board is "ON". Measure the outside (#1 [+] and #10 [–]) terminals on the cable between the main board and the control board. The operating range is 10 to 16 volts DC. If DC volts are not within this range, correct the DC volt supply. D. MAIN BOARD On electronic units, two types of main boards have been used: 115 volt AC and DC volt controlled.
TB1 TB2 COOL CONT ROL DC VOLT CONTROLLED TB4 HIGH RELAY 10 A MP MED RELAY 10 A MP LOW RELAY 10 A MP RIBBON CABLE TB5 ARROW DESIGNAT ES PIN #1 TB6 NO HEAT RELAY 30 A MP NO E. RELAY BOARD COM Next, connect together all four low voltage wires (red, yellow, orange and blue) that go to the thermostat from the relay box. Provide power to the air conditioner. Using an incandescent bulb, check from AC WHITE terminal (one lead from bulb) to NO terminal and HI FAN terminal (other lead from bulb).
SECTION E. ROOF-MOUNTED HEAT PUMP OPERATION E. R22 by passing through the coil. The heat removed from the refrigerant is expelled to the outside air. The refrigerant leaves the outside coil as high pressure liquid. As the high pressure liquid R22 leaves the outside coil (condenser) it passes through the small capillary tube or tubes. This is the metering or flow control device in the sealed system. It determines the amount and force of which the R22 enters the inside coil.
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 compressed, it gives off heat causing the discharge line to be quite warm to the touch. The R22 high pressure vapor leaves the compressor through the discharge line and enters the reversing valve. The reversing valve routes the high pressure vapor to the inside coil. In the heating mode the inside coil is a condenser coil.
4E. MECHANICAL CONTROLS 5E. ELECTRONIC (DIGITAL) CONTROLS This type of heat pump has an air distribution box that has a mechanical selector switch and thermostat installed in it. This type of heat pump is controlled by a DIGITAL wallmounted thermostat. The air distribution can be an air distribution box or a ducted air system. NOTE: Remember to check the installation and operating instructions for the specific model you are diagnosing.
C. FAN SWITCH SWITCH: The Fan Switch has four positions to control the operation of the heat pump blower. It controls the operation of the blower only after the system switch is placed into the COOL or HEAT PUMP position. A description of the three modes is: ACTUAL ACTUAL: When in actual mode, the display is indicating current room temperature. COOL SET SET: When in COOL mode, the display is indicating the current cooling setpoint temperature.
AUXILIARY HEAT HEAT: A. Set the System Switch to AUX. HEAT. B. Set the Fan Switch to AUTO. C. Set the temperature lever to your comfort level. 6E. BIMETAL CONTROLS This type of heat pump is controlled by a Bimetal type wall thermostat. The air distribution can be an air distribution box or a ducted air system. NOTE: The auxiliary heat position is only used if: 1) You have a factory installed furnace operating from the heat pump system thermostat. 2) The outside temperature is above 40°F.
Be sure to check the switch in all positions and be sure you have continuity only on the terminals for the selected position. Lack of continuity or continuity on incorrect terminals designates a defective switch, and it must be replaced. NOTE: The numbers without circles are the white inkstamped numbers. 7E. DC VOLT REQUIREMENTS DC VOLTS On certain models of electronic heat pumps, a DC volt supply is wired to the control board. The operating range is 10 to 16 volts.
Be sure to check the switch in all positions and be sure you have continuity only on the terminals for the selected position. Lack of continuity or continuity on incorrect terminals designates a defective switch, and it must be replaced. Default temperatures of 65°F. for Heat and 75°F. for Cool have been incorporated into this thermostat. If the thermostat is without power for 10 to 15 seconds, it will default to these temperatures.
To c hec k the thermostat chec heck thermostat, first verify positive (+) DC is to red wire (Pin 2), and negative (–) DC is to brown wire (Pin 7) at the back of the thermostat. Operating range is 10 to 16 volts DC. With System Switch in COOL, Fan Switch in HI AUTO and room temperature ABOVE setpoint temperature, you should have voltage between brown wire (Pin 7) to black wire (Pin 4), yellow wire (pin 5) and blue wire T have voltage between brown NOT (Pin 6). You should NO wire to violet or white wires.
With System Switch in the OFF, Fan Switch in HI AUTO or LO AUTO and room temperature ABOVE or BELOW setpoint temperature, you should NOT have voltage between brown wire to violet, white, black, yellow or blue wires. With System Switch in OFF, Fan Switch in LO ON and room temperature ABOVE or BELOW setpoint temperature, you should have voltage between brown wire (Pin 7) to black wire (Pin 4). You should NOT have voltage between brown wire to violet, white, yellow or blue wires.
SWITCH COMBINA TIONS AND COMBINATIONS THEIR CORRESPONDING "A CTIVE" TERMINALS "ACTIVE" With System Switch in AUX HEAT and fan switch in HI ON and room temperature ABOVE setpoint temperature, you should have voltage between brown wire (Pin 7) to black wire (Pin 4) and blue wire (Pin 6). You should NOT have voltage between brown wire to violet, white or yellow wires.
C. BIMETAL This thermostat is designed to operate 12V DC singlestage heat pump and an independent single-stage auxiliary heat system. It is a manual changeover thermostat between heating, cooling and auxiliary heat. Operating temperatures for both heating and cooling systems are changeable to suit the comfort needs of the occupants. This thermostat is used for a remote wall mounted thermostat. The heat pump can have an air distribution box or a ducted system. To check the operation refer to Section 1.3.
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 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 System Switch in AUX HEAT, Fan Switch in LOW 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 wire. You should NOT have continuity between red wire to violet, white, black, yellow or blue wires.
The cable assembly for the Roof-Top Heat Pump is available in 15, 25 and 30 foot lengths. This cable assembly has a male connector on one end (thermostat connection) and a female connector on the other end (heat pump connection). The cable assembly has 10 wires. The arrow on each connector designates Pin 1. To check the cable assembly, disconnect each end of the cable assembly and check for continuity on each wire in the assembly. Also, check each connector for bent pins or loose wires.
13E. RELAY BOARD The relay controls AC power to the reversing valve. There are two different relays used. One relay has a 12V DC rated coil and is used on all Duo-Therm Heat Pumps except the mechanical control types. The mechanical control DuoTherm Heat Pumps use a relay that has a 120V AC rated coil. Both relays have five (5) terminals. Terminals 1 and 3 are the coil terminals.
14E. REVERSING VALVE 15E. The reversing valve is the heart of a heat pump. It directs refrigerant flow to the coils to achieve proper direction of flow that allows the same system to supply heated or cooled air to enter the inside atmosphere of the structure according to occupants' desires. The reversing valve's solenoid can be energized in either HEAT or COOL mode of operation. Duo-Therm Heat Pumps that are roof-mounted units have the solenoid energized in the COOL mode of operation.
SECTION F. DUO-THERM BASEMENT AIR CONDITIONERS & HEAT PUMPS Set the fan "AUTO" Switch to: ON", the fan will run continuously helping the furnace "ON", circulate air. "AUTO" "AUTO", The fan will not operate. OPERATION 1F. MODELS 390XX.XXX This unit functions like a residential air conditioner. AIR CIRCULATION with or Set the System Switch to COOL. Set the Temperature Lever to your comfort level.
NOTE NOTE: The auxiliary heat position is only used if: – You have a factory installed furnace operating from the heat pump system thermostat. All three display modes can be accessed without affecting the operation of the system. The system operation will remain normal unless a change is made to the setpoint to force a change in the system operation. – The outside temperature is above 40 degrees and you wish to operate your furnace. – For quick interior warm up.
HIGH AUTO AUTO: When in the high auto position, the heat pump blower operates at high speed and cycles off and on with the compressor. THERMOSTAT LOW AUTO AUTO: When in low auto position, the heat pump blower operates at low speed and cycles off and on with the compressor. Display delayed 1 minute at turn on. Actual Cool Heat 68 0 F Set Temperature HIGH and LOW ON ON: When in the high or low position, the heat pump blower operates continuously. The compressor cycles off and on as needed.
B. SYSTEM SWITCH SWITCH: The system switch has four positions to control the operation of the heating and cooling systems. They are as follows: THERMOSTAT: This thermostat controls 12 volt DC heating and air conditioning systems. It can control one stage of heat and two stages of cooling. Changeover from heating to cooling is operator controlled — the thermostat can not make this change. Time delay circuits have been incorporated to protect the cooling system components.
The cooling setting determines the temperature at which the air conditioner will start to operate. The heat setting determines the temperature at which the heating system will start to operate. The first compressor and refrigeration circuit is referred to Stage 1 Cooling as "Stage Cooling". The second compressor and refrig2nd Stage eration circuit and air system is referred to as "2nd Cooling Cooling". The first and second stage cooling will operate as indicated below.
Identification and operational descriptions for all control panel switches and display are listed below: C. FAN SWITCH SWITCH: The fan switch has four positions from which to control the operation of the blower. The fan switch controls operation of the heat pump air conditioner blower. A. LIQUID CRYSTAL DISPLAY DISPLAY: This display will be illuminated any time the system is in operation.
Connect "R" from thermostat to red wire in control compartment. Connect "G" from thermostat to blue wire in control box. Connect "Y" from thermostat to yellow wire in control 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. 6F. DC VOLT REQUIREMENTS DC VOLTS On models 391XX.
The heating and cooling thermostat has two switches on the base. They are HEAT-OFF-COOL on the left side, and FAN-AUTO-ON on the right. This thermostat will operate an air conditioner and a furnace. With HEAT-OFF-COOL switch to HEAT and FAN switch to AUTO position, no continuity should exist between RC to Y and RC to G regardless of room temperature. With FAN switch to ON position, continuity should exist between RC to G and no continuity between RC to Y regardless of room temperature.
B. MODELS 39025.502, 39035.601, 39045.601 & 39045.616 the room temperature above the set point temperature continuity should exist between R to Y and R to G. No continuity should exist between R to W. With the room temperature below the set point temperature, continuity should exist between R to G and no continuity between R to Y and R to W. The thermostat is a 24V AC controlled system and is a bimetal type. It has two switches on the face of the thermostat.
C. MODELS 39115.601, 39115.602, 39115.616 & 39115.626 WIRE CONNECTIONS: The thermostat is a 12V DC controlled system and is a bimetal type. It has three (3) switches on the face of the thermostat. On the left side there is a SYSTEM switch and on the right side there are two FAN switches. The top switch if for HI or LOW FAN and the bottom one is for ON or AUTO. This thermostat will operate an air conditioner and a furnace.
temperature above setpoint temperature, continuity should exist between RC to G and RC to Y. No continuity should exist between RC to H and RH to W. With the FAN switches in ON and LOW and the room temperature above the setpoint temperature, continuity should exist between RC to G and RC to Y. No continuity should exist between RC to H and RH to W. between RC to G, RC to Y and RC to H.
D. MODEL 39224.601 This thermostat is designed to operate DC volt controlled air conditioner systems and an independent heat system. It is a manual changeover thermostat between heating and cooling. It also incorporates time delay circuitry to protect against system short cycling. This thermostat has delay circuitry on start-up so Circuit 1 compressor starts after fan motors, then delay circuitry for Circuit 2 compressor start.
With the SYSTEM switch to COOL and FAN switches to LOW ON, and room temperature ABOVE setpoint temperature, you should have voltage between terminal B (black wire) to terminals Y1 (yellow wire) and GL (blue wire). You should NOT have voltage between terminal B (black wire) to terminals GH (orange wire) and W. With room temperature BELOW setpoint temperature, you should have voltage between terminal B (black wire) to terminal GL (blue wire).
To check ACTIVE terminals: Place the negative (–) lead from the DC voltmeter on terminal B (black wire) and the positive (+) lead to the ACTIVE terminal. When the SYSTEM switch is in the COOL position and room temperature is more than two degrees ABOVE set point temperature, terminal Y2 is ACTIVE thirty seconds after terminal Y2 is ACTIVE. THERMOSTAT CONNECTIONS E. MODEL 39424.601 & 393XX.
With System Switch in COOL, Fan Switch in LO ON and room temperature ABOVE setpoint temperature, you should have voltage between brown wire (Pin 7) to black wire (Pin 4) and yellow wire (Pin 5). You should NOT have voltage between brown wire to violet, white or blue wires. With room temperature BELOW setpoint temperature, you should have voltage between brown wire (Pin 7) to black wire (Pin 4). You should NOT have voltage between brown wire to violet, white, yellow or blue wires.
NOTE: When setpoint temperature is changed above or below room temperature, there will be a three (3) minute delay in "active" terminals terminals. With System Switch in the OFF, Fan Switch in HI AUTO or LO AUTO and room temperature ABOVE or BELOW setpoint temperature, you should NOT have voltage between brown wire to violet, white, black, yellow or blue wires.
have voltage between brown wire (Pin 7) to violet wire (Pin 1) and black wire (Pin 4). You should NOT have voltage between brown wire to white, yellow or blue wires. NOTE: When setpoint temperature is changed above or below room temperature, there will be a three (3) minute delay in "active" terminals terminals.
BIMETAL This thermostat is designed to operate 12V DC singlestage heat pump and an independent single-stage auxiliary heat system. It is a manual changeover thermostat between heating, cooling and auxiliary heat. Operating temperatures for both heating and cooling systems are changeable to suit the comfort needs of the occupants. CABLE ASSEMBLY CONNECTOR This thermostat is used for a remote wall mounted thermostat. Check the operation. Next, verify the wiring to the thermostat is correct.
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 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 System Switch in AUX HEAT, Fan Switch in LOW 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 wire. You should NOT have continuity between red wire to violet, white, black, yellow or blue wires. SWITCH COMBINATIONS System Switch Fan Switch HI Auto If room Temp.
8F. B. MODEL 39424.601 HEAT PUMP CABLE ASSEMBLY The cable assembly is a ten-wire cable with seven of the ten wires used. The thermostat end has a 10-pin flat connector 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 Wire The unit end has a 9-pin square connector with seven positions used.
C. MODEL 39325.XXX AND 39335.XXX HEAT PUMPS 9F. REVERSING VALVE The reversing valve is the heart of a heat pump. It directs refrigerant flow to the coils to achieve proper direction of flow that allows the same system to supply heated or cooled air to enter the inside atmosphere of the structure according to occupants' desires. The cable assembly is a ten wire cable with seven of the ten wires used. The thermostat end has a 10-pin flat connector with seven positions used.
10F. TRANSFORMER RELAY BOARD The transformer supplies low AC volts for the control circuit on the following air conditioner models: D.C. VOLT 39025.XXX, 39035.XXX & 39045.XXX TB8 TB9 Y TB4 RC TB5 G TB6 H RELAY 10 AMP RELAY 10 AMP TB3 FAN HI TB2 FAN LOW COM To check the transformer, first verify 120 volt AC is to the line terminals. Next, verify at least 24 volt AC is on the load terminals. If 24 volt AC is present on the load terminals, the transformer is good.
To check the changeover thermostat, first verify the air temperature at the capillary tube. If the temperatures are above 45°F., continuity should be between terminals 2 to 3 and no continuity between terminals 2 to 1. For temperatures below 40°F., continuity should be between terminals 2 to 1 and no continuity between terminals 2 to 3. 14F. RELAY A. Relay, SPST (single pole/single throw) is used on Models 39224.601 and 39424.601. On Model 39224.
C. Relay, SPDT (single pole/double throw) is used on Models 39424.601, 39115.626, 39125.601, 39335.601 and 39335.636. 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 to NO. If the above checks are correct, the relay is good – DO NOT replace it. If the previous checks are not correct, the relay is defective and should be replaced. On Model 39424.
F. Relay, SPDT (single pole/double throw) is used on Models 390XX.XXX. It controls the fan motor. H. Relay, DPST (double pole/single throw) is used on Models 390XX.XXX. It controls the compressor. The relay has a 24 volt AC coil. To check the relay, first verify all AC volts have been turned off to the unit. The relay has a 24 volt AC coil. To check the relay, first verify all AC volts have been turned off to the unit. Next, remove the wires from terminals 2, 4, 6 and 8.
SECTION G. DUO-THERM COMFORT CONTROL CENTER SYSTEMS C. MODE SELECTOR BUTTON – Modes of operation available are: OFF, FAN ONLY, COOL, HEAT PUMP, FURNACE and HEAT STRIP. Remember, the LCD readout will only show the options available based on the appliances installed on your vehicle. To select the mode of operation, momentarily depress the MODE push-button. You will need to continue to depress and release the button until the desired mode is shown in the LCD readout area on the Comfort Control Center. 1G.
F. ON/OFF SWITCH – The ON/OFF switch is located on the lower right hand edge of the Comfort Control Center. Move the lever from side to side to change status. 4. 5. GENERAL INFORMATION A. The ability of the air conditioner to maintain the desired inside temperature depends on the heat gain of the RV. Some preventative measures taken by the occupants of the RV can reduce the heat gain and improve the performance of the air conditioner.
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. Repeat entire procedure for each additional zone. NOTE: If set point is too low, the inside coil could freeze up. 68 NOTE: See Sections K & L for additional Special Heat Pump Features. 72 D. FURNACE MODE OPERATION C. (If the vehicle is equipped with a gas furnace connected to the Comfort Control Center) 1.
E. HEAT STRIP MODE OPERATION F. (For Duo-Therm air conditioners with an electric heat strip) When AUTO FAN is selected, the fan speed will be determined by the mode you are in. 1. Momentarily depress and release the MODE pushbutton until the HEAT STRIP indicator on the LCD is illuminated. 2. The fan will operate in LOW, MED or AUTO. You will not be able to select HIGH speed when in the HEAT STRIP mode. Depress and release the FAN pushbutton to select desired speed. 3.
2) Momentarily depress the FAN pushbutton until the desired fan speed indicator is illuminated (LOW, HIGH, AUTO) designed, you have the freedom of selecting the MODE of operation for each zone independently. To change from one zone to another, simultaneously depress the FAN and MODE pushbuttons. Each time you depress and release these pushbuttons, the indicator will change the zone data displayed. To program each zone, simply repeat the programming steps shown in the operation section of this manual.
point is set at 5°F. The secondary stage will activate when the actual room temperature reaches 77°F (72°F + 5°F), and will continue to operate until the room once again becomes 72°F. outside ambient temperature is less than 42°F and greater than 24°F, a defrost timing cycle will begin. The defrost timing cycle will allow operation of the heat pump for 40 minutes. The fan will then be shut off, the refrigerant flow reversed and run for 4-1/2 minutes, this is the DEFROST cycle.
2G. CONFIGURATION A. The Comfort Control Center configuration relates to setting the Dip switches and particular components (remote temperature sensor, cold [freeze] control and ambient sensor) that can be plugged into the AC power module board according to the type of unit and accessories included. 1) ONE ROOFTOP AIR CONDITIONER To configure one rooftop air conditioner, all Dip switches are to "OFF" position and the cold (freeze) control is plugged into P5 (blue) connector.
2. ONE ROOFTOP AIR CONDITIONER PLUS ONE GAS FURNACE To configure one rooftop air conditioner plus one gas furnace, all Dip switches are "OFF" and the freeze control is plugged into the proper connector (blue) 115VAC, 12VDC. Two thermostat wires from the furnace and telephone cable communications line are properly connected to the air conditioner electronic control box. NOTE: If a remote sensor is used, it must be plugged into the P4 (white) connector. Improper connections can cause component damage.
3. ONE ROOFTOP AIR CONDITIONER WITH HEAT STRIP PLUS ONE GAS FURNACE To configure one rooftop air conditioner with heat strip plus one gas furnace, turn heat strip (#1) Dip switch to ON and all other Dip switches to OFF. The freeze control is plugged into the proper connector (blue). 115VAC, 12VDC, two thermostat wires from the furnace and telephone cable communications line are properly connected to the air conditioner electronic control box.
4. NOTE: If a remote sensor is used, it must be plugged into the P4 (white) connector. ONE ROOFTOP HEAT PUMP PLUS ONE GAS FURNACE To configure one rooftop heat pump plus one gas furnace, all Dip switches are OFF. The freeze control is NOT used. The blue connector must stay open (P5). The ambient sensor is plugged into the proper connector (red). 115VAC, 12VDC, two thermostat wires from the furnace and telephone cable communications line are properly connected to the heat pump electronic control box.
5. ONE BASEMENT AIR CONDITIONER PLUS ONE GAS FURNACE To configure one basement air conditioner plus one gas furnace, all Dip switches are OFF. 115VAC, 12VDC, two thermostat wires from the furnace and telephone cable communications line are properly connected to the air conditioner electronic control box. NOTE: If a remote sensor is used, it must be plugged into the P4 (white) connector. Improper connections can cause component damage.
6. ONE BASEMENT HEAT PUMP PLUS ONE GAS FURNACE To configure one basement heat pump plus one gas furnace, all Dip switches are OFF. The ambient sensor is plugged into the proper connector (red). 115VAC, 12VDC, two thermostat wires from the furnace and telephone cable communications line are properly connected to the AC power module in the unit's electrical box. NOTE: If a remote sensor is used, it must be plugged into the P4 (white) connector. Improper connections can cause component damage.
7. NOTE: If a remote sensor(s) is used, it must be plugged into the P4 (white) connector. ONE DUAL BASEMENT AIR CONDITIONER PLUS ONE GAS FURNACE To configure one dual basement air conditioner plus one gas furnace, the STAGE Dip switch on AC power module for Circuit 2 must be turned to ON. All other Dip switches are OFF on both AC power modules.
8. ONE DUAL BASEMENT HEAT PUMP PLUS ONE GAS FURNACE To configure one dual basement heat pump plus one gas furnace, the STAGE Dip switch on AC power module for Circuit 2 must be turned to ON. All other Dip switches are OFF on both AC power modules. Two (2) ambient sensors (one per AC power module), are plugged into the proper connector (red) on each AC power module.
ZONE 2 configuration should have Dip switch 5 (ZONE 2) in the ON position and all other Dip switches in the OFF position. The cold (freeze) control should be plugged into P5 (blue) connector and the remote sensor plugged into P4 (white) connector on the AC power module. (Refer to Figure "ZONE 2") B. TWO COMFORT ZONES 1. TWO ROOFTOP AIR CONDITIONERS PLUS ONE GAS FURNACE To configure two rooftop air conditioners plus one gas furnace, ZONES need to be established.
REAR REMOTE SENSOR ZONE 2 FURNACE 2 WIRES ZONE 1 115V AC REAR AC CIRCUIT BREAKER BOX TELEPHONE CABLE COMMUNICATIONS LINE FURNACE TELEPHONE CABLE COMMUNICATIONS LINE Typical installation for two comfort zones with two rooftop airs and one furnace. Two remote sensors may be used. 115V AC FRONT A/C FRONT REMOTE SENSOR *(OPTIONAL) *Comfort control may serve as a room temperature sensor; or a remote sensor may be used.
ZONE 2 configuration should have Dip switch 1 (heat strip) and 5 (ZONE 2) to ON position. The cold (freeze) control should be plugged into P5 (blue) connector and remote sensor plugged into P4 (white) connector on the AC power module. (Refer to Figure "ZONE 2") NOTE: If a remote sensor(s) is used, it must be connected into the P4 (white) connector. Improper connections can cause component damage.
3. ONE ROOFTOP AIR CONDITIONER PLUS ONE ROOFTOP HEAT PUMP PLUS ONE GAS FURNACE To configure one rooftop air conditioner plus one rooftop heat pump plus one gas furnace, ZONES need to be established. For explanation purposes the front unit will be a heat pump on ZONE 1. The rear unit will be an air conditioner on ZONE 2. Zones can be arranged per the customer's wishes. ZONE 2 (Air Conditioner) configuration should have Dip switch 5 (ZONE 2) to ON position and all other Dip switches to OFF position.
REAR REMOTE SENSOR ZONE 2 FURNACE 2 WIRES ZONE 1 115V AC REAR AC CIRCUIT BREAKER BOX TELEPHONE CABLE COMMUNICATIONS LINE FURNACE TELEPHONE CABLE COMMUNICATIONS LINE Typical installation for two comfort zones with rooftop air and heat pump and one furnace. Two remote sensors may be used. 4. 115V AC FRONT A/C FRONT REMOTE SENSOR *(OPTIONAL) *Comfort control may serve as a room temperature sensor; or a remote sensor may be used.
ZONE 2 configuration should have Dip switch 5 (ZONE 2) to ON position and all other 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. (Refer to Figure "ZONE 2") NOTE: If a remote sensor(s) is used, it must be connected into the P4 (white) connector. Improper connections can cause component damage.
5. TWO BASEMENT AIR CONDITIONERS PLUS ONE GAS FURNACE To configure two basement air conditioners plus one gas furnace, ZONES need to be established. For explanation purposes, the front unit will be ZONE 1, and the rear unit will be ZONE 2. Zones can be arranged per the customer's wishes. ZONE 1 configuration should have all Dip switches to OFF position. (Refer to Figure "ZONE 1") ZONE 2 configuration should have Dip switch 5 (ZONE 2) to ON position and all other Dip switches to OFF position.
115V AC REAR A/C DUO-THERM COMFORT CONTROL REAR REMOTE SENSOR TELEPHONE CABLE COMMUNICATIONS LINE REAR BASEMENT AIR ZONE 2 CIRCUIT BREAKER BOX FURNACE 115V AC FRONT A/C FURNACE 2 WIRES TELEPHONE CABLE COMMUNICATIONS LINE FRONT BASEMENT AIR ZONE 1 FRONT REMOTE SENSOR * *Comfort control may serve as a room temperature sensor, or a remote sensor may be used. AC CONTROL BOX Typical installation for two comfort zones with two basement air conditioners and one furnace. 12V DC INPUT 2 WIRES 6.
NOTE: If a remote sensor(s) is used, it must be connected into the P4 (white) connector. Improper connections can cause component damage.
7. TWO ROOFTOP AIR CONDITIONERS PLUS TWO GAS FURNACES To configure two rooftop air conditioners plus two gas furnaces, ZONES need to be established. For explanation purposes, the front air conditioner and one furnace will be Zone 1, and the rear air conditioner and one furnace will be Zone 2. Zones can be arranged per the customer's wishes. The two (2) furnace thermostat wires from rear furnace are to Zone 2 (rear) air conditioner.
Typical installation for two comfort zones with two rooftop air conditioners and two furnaces. REAR REMOTE SENSOR ZONE 2 FURNACE 2 WIRES ZONE 1 115V AC REAR A/C CIRCUIT BREAKER BOX FURNACE 2 WIRES TELEPHONE CABLE COMMUNICATIONS LINE FURNACE TELEPHONE CABLE COMMUNICATIONS LNE FURNACE 115V AC FRONT A/C FRONT REMOTE SENSOR *(OPTIONAL) DUO-THERM COMFORT CONTROL *Comfort control may be serve as a room temperature sensor, or a remote sensor may be used.
8. ONE ROOFTOP HEAT PUMP PLUS ONE ROOFTOP AIR CONDITIONER PLUS TWO GAS FURNACES To configure one rooftop heat pump plus one rooftop air conditioner plus two gas furnaces, ZONES need to be established. For explanation purposes, the front unit (heat pump) and one furnace will be Zone 1; and the rear unit (air conditioner) and one furnace will be Zone 2. Zones can be arranged per the customer's wishes.
Typical installation for two comfort zones with rooftop air conditioner plus heat pump and two furnaces. REAR REMOTE SENSOR ZONE 2 FURNACE 2 WIRES ZONE 1 115V AC REAR A/C CIRCUIT BREAKER BOX FURNACE 2 WIRES TELEPHONE CABLE COMMUNICATIONS LINE FURNACE TELEPHONE CABLE COMMUNICATIONS LNE FURNACE 115V AC FRONT A/C FRONT REMOTE SENSOR *(OPTIONAL) DUO-THERM COMFORT CONTROL *Comfort control may be serve as a room temperature sensor, or a remote sensor may be used. 12V DC INPUT 2 WIRES C.
Next check the output DC volts from the AC power module. This can be done by using a short telephone communications line. One end plugged into one of the RJ11 connectors on the AC power module and the other end plugged into a standard telephone jack. Next measure the DC volts between red (+) and black (–). If volts are more at this check, AC ripple is on the incoming DC source. Be sure DC volts are less than 30. 3G.
To check the Comfort Control Center, first verify the ON/OFF switch is in the ON position. Next, verify DC volts (10 to 30) and polarity are correct (see Sec. 4). Then do a reset procedure (see Sec. 1M). If the Comfort Control Center still does not illuminate when depressing any selector button or the liquid crystal display does not read (See Sec. 1), replace it. If the correct function does not show on the liquid crystal display, verify configuration is correct (see Sec.
3. RELAY, 2-POLE 4. AMBIENT SENSOR The relay is used on basement air conditioner Model 39125 and Basement heat pump Model 39335 ONLY. The relay has five (5) terminals. It is used to complete a circuit to the furnace. The ambient sensor is the outside air temperature sensor and is used on heat pump units only. This component allows the heat pump to operate down to 24°F. See Sec. 1G for detailed information on operation. To check the ambient sensor, first measure outside temperature surround the sensor.
n Ensure that the compressor is operational by: A. Placing mode switch to cool. B. Lower temperature setting to start compressor operation (approx. 2 min. time delay) C. Once compressor is operational adjust setting up to shut down compressor system. Locate sensor attached to zone being tested. Using a hair dryer or other heat producing air device, GRADUALLY heat up the area surrounding the thermistor. Ensure that device does not place excessive heat on plastic cover.
C. SINGLE BASEMENT AIR CONDITIONER To verify circuits are being completed by the AC power module board, you would first remove the electric box cover and locate the AC power module board. Using a 115 volt incandescent bulb, check from AC white (common) of incoming 115V AC; one lead from incandescent bulb, the other lead from incandescent bulb to the terminals listed below to determine if a particular circuit is completed through the board. If the circuit is completed, the light will illuminate.
D. SINGLE BASEMENT HEAT PUMP To verify circuits are being completed by the AC power module board, you would first remove the electric box cover and locate the AC power module board. Using a 115 volt incandescent bulb, check from AC white (common) of incoming 115V AC; one lead from incandescent bulb and the other lead from incandescent bulb to the terminals listed below to determine if a particular circuit is completed through the board. If the circuit is completed, the light will illuminate.
One test is to remove the fuse and do a continuity test. No continuity requires the fuse be replaced. Continuity means the fuse is good. Another test can be done without removing the fuse. Use a DC volt meter to check between ground or negative (–) DC to each side of fuse. If there is voltage on each side, the fuse is good. If there is voltage on one side only, the fuse is defective and requires replacement.
The FB (furnace blower) relays were installed for an ADDITIONAL FEATURE; to provide a circuit for the furnace blower motor to enhance both the cooling and heating operation. NOTE: This circuit will not work with all furnaces. Before sing this circuit, check with the furnace manufacturer for proper wire connection to the furnace. Other components may or may not be required. Read and follow the instructions provided with the furnace.
