10-19-00 Air Conditioner Heat Pump Service Manual - Bryant RV ...

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Section C - Components, cont’d.C16l.Relay, DPST (double pole/single throw) is used on Models390XX.XXX.It controls the compressor.The relay has a 24 volt AC coil. To check the relay, firstverify all AC volts have been turned off to the unit.Next, remove the wires from terminals 2, 4, 6 and 8. Verifythe coil (terminals 0 and 1) are not energized (no AC power).Continuity should not exist between terminals 2 to 4 or terminals6 to 8. Next, energize the coil (terminals 2 to 4 andterminals 6 to 8. If the above checks are correct, the relayis good - DO NOT replace it. If the checks are not correct,the relay is defective - replace it.FIG. C32C16m.Relay, DPST (double pole/single throw) is used onModel 39424.601.It controls HIGH FAN and LOW FAN on Circuit 1 and 2. Ifthis relay is not wired correctly, Circuit 1 fan will not operatewith Circuit 1 compressor.The relay has a 120 volt AC coil. To check the relay, firstverify all AC volts have been turned off to the unit.Next remove the wires from terminals 2, 4, 6 and 8. Verifythe coil (terminals 0 and 1) are not energized (no AC power).Continuity should not exist between terminals 2 to 4 or terminals6 to 8. If the above checks are correct, the relay isgood - DO NOT replace it. If the checks are not correct,the relay is defective - replace it.FIG. C33C17. Printed Circuit BoardsC17a.Circuit Board for Bi-MetalThermostatThe relay board consists of a transformer, compressor relay,two fan relays and other components. If any one ofthese are defective, the complete relay board must be replaced.The relay board completes circuits to the fan motor andcompressor depending on what mode switch and temperaturesetting is on the thermostat.Remove the cover from the electric box and verify the redwire is on terminal RC, black wire is on terminal G, bluewire is on terminal H and yellow wire is on terminal Y.With AC power to the relay board, check between terminalsRC and G or H. There should be 12 volts DC. If novoltage is detected, the transformer on the relay board isdefective. Replace the relay board.If 12 volts DC is available, disconnect power to the unit andremove the HI FAN wire (black) and the LOW FAN wire(red) and the compressor wire (large black) from the NOterminal on the compressor relay on the relay board.FIG. C3438Next, remove the red, yellow, black and blue wires fromterminals RC, Y, G and H on the relay board. Place a jumperfrom terminal RC to terminal Y. Provide power to the unit.Using an incandescent bulb, check from AC white terminal(one lead from bulb) to NO terminal on compressor relayon the relay board (other lead from bulb). The bulb shouldilluminate. Remove the jumper from terminal RC to terminalG. Now place one lead from bulb to AC white terminaland the other lead from bulb to LOW FAN terminal. Thebulb should illuminate. Remove the jumper and the bulbshould not illuminate Next, place a jumper from terminal
Section C - Components, cont’d.RC to terminals G and H. Now place one lead from bulb toAC white terminal and the other lead from bulb to AC whiteterminal and the other lead from bulb to HIGH FAN. Thebulb should illuminate. Remove the jumper and the bulbshould not illuminate. If these tests are correct, the relayboard is good. DO NOT replace it. If any one of these testsare incorrect, replace the relay board.C17b.Analog Printed Circuit BoardControl BoxThe Analog Control Box comes in 3 different configurations,that are not interchangeable. The Analog Control Boardconsists of several relays, plug receptacles and other components.If any one of these are defective the entire AnalogControl Box should be replaced.The Analog Control Box works with the Analog Thermostatto change or switch AC circuits that control the operation ofthe Duo-Therm Unit.1. Air ConditionersTo verify circuits are being completed by the Analog ControlBox, you would first disconnect the 6-pin plug connectorfrom the Analog Control Box.Using a 115 volt AC incandescent bulb, check from terminal5 (white-common) to the other terminals to determine ifa particular circuit is completed through the Analog ControlBox. If the Circuit is completed the light will illuminate.Terminal 1 is a blue wire and the compressor circuit.Terminal 2 is a black wire and the High Fan circuit.Terminal 3 is a yellow wire and not used.Terminal 4 is a red wire and the Low Fan circuit.Terminal 5 is a white wire and the common AC connection.Terminal 6 is a green/yellow wire and chassis ground.Note: DO NOT use a voltmeter to do these checks as it willgive erroneous readings.FIG. C35If the circuit is completed and a component is not operating,the problem is in the rooftop unit.2. Air Conditioners with Heat StripTo verify circuits are being completed by the Analog ControlBox, you would first disconnect the 6-pin plug connectorfrom the Analog Control Box.Using a 115 volt AC incandescent bulb, check from terminal5 (white-common) to the other terminals to determine ifa particular circuit is completed through the Analog ControlBox. 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.Terminal 3 is a yellow wire and not used.Terminal 4 is a red wire and the Low Fan circuit.Terminal 5 is a white wire and the common AC connection.Terminal 6 is green/yellow wire and chassis ground.To verify heat strip operation disconnect the 3-pin plug andusing a 115 volt AC bulb, check from Terminal 1 to Terminal3. If the circuit is completed the bulb will illuminate.Note: DO NOT use a voltmeter to do these checks as itwill give erroneous readings.If the circuit is completed and a component is not operating,the problem is in the rooftop unit.3. Roof Top Heat PumpTo verify circuits are being completed by the Analog controlBox, you would first disconnect the 6-pin plug connectorfrom the Analog Control Box.Using a 115 volt AC incandescent bulb, check from terminal5 (white-common) to the other terminals to determine ifa particular circuit is completed through the Analog ControlBox. If the circuit is completed, the light will illuminate.Terminal 1 is a blue wire and the compressor circuit.Terminal 2 is a black wire and the High Fan circuit.Terminal 3 is a yellow wire and reversing valve circuit.This circuit is energized in the cooling mode andnot energized in the heat pump mode.Terminal 4 is a red wire and the Low Fan circuit.Terminal 5 is a white wire and the common AC connection.Terminal 6 is green/yellow wire and chassis ground.Note: DO NOT use a voltmeter to do these checks as itwill give erroneous readings.If the circuit is completed and a component is not operating,the problem is in the rooftop unit.39
Page 1 and 2: AIR CONDITIONER & HEAT PUMPSERVICE
Page 3: A1. AC VoltageThe unit is a 115VAC,
Page 6: Section A - Installation, cont’d.
Page 9 and 10: A6a. Roof Top UnitsSection A - Inst
Page 11 and 12: A6b. Basement Unitswill have the
Page 13 and 14: A6b. Basement UnitsFREE AREA - is t
Page 15 and 16: Section A - Installation, cont’d.
Page 17 and 18: B1b. Bimetal Relay ControlsCooling
Page 19 and 20: B1d. Comfort Control CenterON/OFF S
Page 21 and 22: B1d. Comfort Control CenterHeat Pum
Page 23 and 24: B1d. Comfort Control CenterFIG. B11
Page 25 and 26: B2. Heat Pumpleaves the outside coi
Page 27 and 28: B2. Heat PumpFIG. B18 13Wait at lea
Page 29 and 30: C1. MotorsRoof Top Units - To check
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10-19-00 Air Conditioner Heat Pump Service Manual - Bryant RV ...

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