Carrier GT-G User Manual

Also see for GT-PX: Technical guide

Contents

CarrierCarrier Indoor & Outdoor Split Geothermal Heat Pumps - Rev.: 08/10/0542Unit OperationT-stat signalTTS GSS/PDW GSS/PDWVariable SpeedAir HandlerVariable SpeedAir HandlerPSC Air HandlerG Fan only Fan only Fan onlyG, Y or Y1 Stage 1 heating 1 Stage 1 heating 3 Stage 1 heating 5G, Y1, Y2 Stage 2 heating 1 Stage 2 heating 3 Stage 2 heating 5G, Y1, Y2, W Stage 3 heating1 Stage 3 heating 3 N/AG, W Emergency heat Emergency heat Emergency heatG, Y or Y1, O Stage 1 cooling 2 Stage 1 cooling 4 Cooling 6G, Y1, Y2, O Stage 2 cooling 2 Stage 2 cooling 4 N/A1 Stage 1 = 1st stage compressor, 1st stage fan operationStage 2 = 2nd stage compressor, 2nd stage fan operationStage 3 = 2nd stage compressor, auxiliary electric heat, 2ndor 3rd stage fan operation (depending on fan settings)2 Stage 1 = 1st stage compressor, 1st stage fan operation, reversing valveStage 2 = 2nd stage compressor, 2nd stage fan operation, reversing valve3 Stage 1 = compressor, 1st stage fan operationStage 2 = compressor, 2nd stage fan operationStage 3 = compressor, auxiliary electric heat, 2nd or 3rd stage fan operation (depending on fan settings)4 Stage 1 = compressor, 1st stage fan operation, reversing valveStage 2 = compressor, 2nd stage fan operation, reversing valve5 Stage 1 = compressor, fanStage 2 = compressor, auxiliary electric heat, fan6 Cooling = compressor, fan, reversing valveDiagnostic FeaturesThe LED on the CXM board advises the technician ofthe current status of the CXM control. The LED candisplay either the current CXM mode or the last fault inmemory if in test mode. If there is no fault in memory,the LED will flash Code 1 (when in test mode).CXM Control Start-up OperationThe control will not operate until all inputs and safetycontrols are checked for normal conditions. Thecompressor will have a 5 minute anti-short cycle delayat power-up. The first time after power-up that there is acall for compressor, the compressor will follow a 5 to 80second random start delay. After the random start delayand anti-short cycle delay, the compressor relay willbe energized. On all subsequent compressor calls, therandom start delay is omitted.CXM ControlsGT-PX GT-GS / GT-S GT-GS / GT-S