Carrier WEATHERMAKER 48A2020 - Page 126

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Table 103 — Staged Gas Control Board (SCB) Inputs and Outputs
POINT
NAME
POINT DESCRIPTION
I/O POINT
NAME
PLUG AND PIN
REFERENCE
SIGNAL PIN(S) PORT STATE
INPUTS
AN1 J5, 1-3 1=5v, 2=Vin, 3=GND (thermistor 1-2) (0 to 5VDC, thermistor, ohms)
AN2 J5, 4-6 4=5v, 5=Vin, 6=GND (thermistor 4-5) (0 to 5VDC, thermistor, ohms)
LAT1SGAS Leaving air temperature 1 AN3 J5, 7-9 7=5v, 8=Vin, 9=GND (thermistor 7-8) (0 to 5VDC, thermistor, ohms)
LAT2SGAS Leaving air temperature 2 AN4 J5, 10-12 10=5v, 11=Vin, 12=GND (thermistor 10-11) (0 to 5VDC, thermistor, ohms)
LAT3SGAS Leaving air temperature 3 AN5 J5, 13-15 13=5v, 14=Vin, 15=GND (thermistor 13-14) (0 to 5VDC, thermistor, ohms)
AN6 J6, 1-3 1=5v, 2=Vin, 3=GND (thermistor 1-2) (0 to 5VDC, thermistor, ohms)
AN7 J6, 4-6 4=5v, 5=Vin, 6=GND (thermistor 4-5) (0 to 5VDC, thermistor, ohms)
AN8 J6, 7-9 7=5v, 8=Vin, 9=GND (thermistor 7-8) (0 to 5VDC, thermistor, ohms)
AN9 J7, 1-2 1 (thermistor, ohms)
AN10 J7, 3-4 3 (thermistor, ohms)
OUTPUTS
AO1 J8, 1-2 1=0 to 20mA, 2=GND 0 to 20mA OUT
AO2 J8, 3-4 3=0 to 20mA, 4=GND 0 to 20mA OUT
HS3 Heat Stage 3 RLY1 J9, 1-3 1 = 2 = RLY1A, 3 = RLY1B 1 = Closes RLY1A/RLY1B
HS4 Heat Stage 4 RLY 2 J9, 4-6 4 = 5 = RLY2A, 6 = RLY2B 1 = Closes RLY2A/RLY2B
HS5 Heat Stage 5 RLY 3 J9, 7-9 7 = 8 = RLY3A, 9 = RLY3B 1 = Closes RLY3A/RLY3B
HS6 Heat Stage 6 RLY 4 J9, 10-12 10 = 11= RLY4A, 12 = RLY4B 1 = Closes RLY4A/RLY4B
RLY 5 J9, 13-15 13 = 14 = RLY5A, 15 = RLY5B 1 = Closes RLY5A/RLY5B
Fig. 31 — Economizer Control Board (ECB1) and VAV Control Board (ECB2)