142
Table 105 — Main Control Board (MBB) Inputs and Outputs
POINT NAME POINT DESCRIPTION TYPE OF I/O I/O POINT NAME
CONNECTOR
PIN NO.
INPUTS
IGCFAN IGC IFO input Switch Input DI1 J6, 3-4
FSD Fire Shutdown Switch, RA/SA Smoke Detector Switch Input DI2 J6, 5-6
G Thermostat ‘G’ Input Switch Input DI3 J7, 1-2
W2 Thermostat ‘W2’ Input Switch Input DI4 J7, 3-4
W1 Thermostat ‘W1’ Input Switch Input DI5 J7, 5-6
Y2 Thermostat ‘Y2’ Input Switch Input DI6 J7, 7-8
Y1 Thermostat ‘Y1’ Input Switch Input DI7 J7, 9-10
CSB_A1 Compressor A1 Feedback Digital Input DIG1 J9, 10-12
CSB_B1 Compressor B1 Feedback Digital Input DIG2 J9, 7-9
CSB_A2 Compressor A2 Feedback Digital Input DIG3 J9, 4-6
CSB_B2 Compressor B2 Feedback Digital Input DIG4 J9, 1-3
DP_A Discharge Pressure Circuit A Thermistor/Transducer (0-5 V) AN1 J8, 21-23
DP_B Discharge Pressure Circuit B Thermistor/Transducer (0-5 V) AN2 J8, 24-26
SP_A Suction Pressure Circuit A Thermistor/Transducer (0-5 V) AN3 J8, 15-17
SP_B Suction Pressure Circuit B Thermistor/Transducer (0-5 V) AN4 J8, 18-20
RAT Return Air Temperature Thermistor AN5 J8, 9-10
SA_TEMP Supply Air Temperature Thermistor AN6 J8, 11-12
OAT Outside Air Temperature Thermistor AN7 J8, 13-14
SPT Space Temperature Thermistor AN8 J8, 1-2
SPTO Space Temperature Offset Thermistor AN9 J8, 3-4
IAQ, IAQMINOV IAQ Input Thermistor AN10 J8, 5-6
FLTS Filter Status Switch Thermistor AN11 J8, 7-8
OUTPUTS
CMPB2 Compressor B2 Relay RLY 1 J10, 20-21
CMPB1 Compressor B1 Relay RLY 2 J10, 22-23
CMPA2 Compressor A2 Relay RLY 3 J10, 24-25
CMPA1 Compressor A1 Relay RLY 4 J10, 26-27
CONDFAN2 Condenser Fan Circuit B Relay RLY 5 J10, 10-11
CONDFAN1 Condenser Fan Circuit A Relay RLY 6 J10, 12-13
HS2 Heat Relay 2 Relay RLY 7 J10, 14-16
HS1 Heat Relay 1 Relay RLY 8 J10, 17-19
PE1 Power Exhaust Relay 1 Relay RLY 9 J10, 4-6
SFAN Supply Fan Relay Relay RLY 10 J10, 7-9
ALRM Alarm Relay Relay RLY 11 J10, 1-3
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