Controls, Start-Up, Operation, Service And Troubleshooting - Carrier

Table 3 — Scroll Protection Module Inputs and Outputs*DESCRIPTION INPUT/OUTPUT I/O TYPE* “x” denotes the circuit, A, B or C. “n” denotes the compressor number, 1, 2, 3, or 4.SCROLLING MARQUEEPOINT NAMEPower (24 vac supply) — — —Local Equipment Network — — —Circuit x High Pressure Switch HPS-x Switch Not availableCompressor xn Motor Temperature MTR-xn PTC Thermistor Not availableCompressor xn Contactor Cxn Relay OUTPUTS→CIR.x→CP.xnCrankcase Heater CCH Relay OUTPUTS→CIR.x→HT.xnCircuit x High Pressure Switch HPS-x Switch Not availableCONNECTION POINTPin NotationSPM-xn-J1QC1 24 vacQC2 GroundSPM-xn-JP11 +2 G3 -SPM-xn-JP22 +3 G4 -SPM-xn-JP312SPM-xn-JP412SPM-xn-JP512SPM-xn-JP612SPM-xn-JP21Electronic Expansion Valve (EXV) Board — Atleast one EXV board is used in all machines. There is one EXVboard for 2 circuit machines. Three circuit machines have twoEXV boards. See Fig. 3. The board is responsible for monitoringthe return gas temperature thermistors. The board alsosignals the EXV motors to open or close. The electronic expansionvalve board responds to commands from the MBB andsends the MBB the results of the channels it monitors via theLEN (local equipment network). See below for DIP switchinformation for EXV1 and EXV2. See Tables 4 and 5 for EXVinputs and outputs.EXV1 DIP Switch 1 2 3 4 5 6 7 8Address: ON ON ON ON ON ON OFF ONEXV2 DIP Switch 1 2 3 4 5 6 7 8Address: OFF ON ON ON ON ON OFF ON6