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

Section C - Components, cont’d.4. Basement Heat PumpTo verify circuits are being completed by the Analog ControlBoard, you must remove the cover of the unit electricalbox.Using a 115 volt AC incandescent bulb, check from terminal“C” (white wire) on the Fan/Run capacitor to the terminalson the analog control board. If the circuit is completedthe light will illuminate.Common Terminal (Black) on K4 Relay115 VAC SupplyNo Terminal (Blue) on K4 RelayCompressorTerminal T1 (Black) on Control BoardHigh FanTerminal T2 (Red) on Control BoardLow FanTerminal No (Black) on K5 RelayReversing ValveNote: Do not use a volt meter to do these checks as it willgive erroneous readings.If the circuit is completed and a component is not operating,the problem is in the component of basement unit.C17c.Comfort Control CenterPrinted Circuit Board (ACPower Module Board/ControlBox)The AC power module board consists of relays, dipswitches, plug receptacles and other components. If anyone of these are defective, the complete control box mustbe replaced. Replace power module board on units thatare not equipped with a replaceable control box. The 3-amp fuse is the only replaceable component.The board is a signal receiver and completes AC volt circuitsaccording to what signal it receives. Before diagnosingthe AC power module, verify Configuration Operation,Comfort Control Center. Make sure DC volts are withinoperation range and 115 volts AC is supplied to the ACpower module board.1. Roof Top Air ConditionersTo verify circuits are being completed by the AC powerFIG. C3640module board, you would first disconnect the 6-pin plugconnector from the electric kit.Using a 115 volt incandescent bulb, check from terminal 5(white-common) to the other terminals to determine if aparticular circuit is completed through the board. If the circuitis completed, the light will illuminate.Terminal 1 is a blue wire and is the compressor circuit.Terminal 2 is a black wire and is High Fan 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 itwill give erroneous readings.If the circuit is completed and that component is not operating,the problem is in the rooftop unit or the connection isnot being completed through the connector.2. Rooftop Heat PumpTo verify circuits are being completed by the AC powermodule board you would first disconnect the 6-plug connectorfrom the electric kit.Using a 115 volt incandescent bulb, check from terminal 5(white-common) to the other terminals to determine if aparticular circuit is completed through the board. If the circuitis completed, the light will illuminate.Terminal 1 is a blue wire and is the compressor circuit.Terminal 2 is a black wire and is High Fan circuit.Terminal 3 is a yellow wire and is reversing valve circuit.This circuit is energized in cooling mode andnot energized in the heat pump mode.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 itwill give erroneous readings.If the circuit is completed and that component is not operating,the problem is in the rooftop unit or the connection isnot being completed through the connector.It is possible to make the above checks on the board, ifnecessary.3. Single Basement Air ConditionerTo verify circuits are being completed by the AC powermodule board, you would first remove the electric box coverand locate the AC power module board.Using a 115 volt incandescent bulb, check from AC white(common) of incoming 115V AC; one lead from incandescentbulb, the other lead from incandescent bulb to theterminals listed below to determine if a particular circuit iscompleted through the board. If the circuit is completed,the light will illuminate.