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Table 115 — Main Control Board (MBB) Inputs and Outputs
YAC — Gas Heat Unit
POINT
NAME
POINT DESCRIPTION
I/O POINT
NAME
PLUG AND PIN
REFERENCE
SIGNAL PIN(S) PORT STATE
INPUTS
GASFAN YAC Indoor Fan relay (fan request from YAC) DI1 J6, 3-4 4 0 = 24vac, 1= 0vac
FSD Fire Shutdown switch input DI2 J6, 5-6 6 0 = 24vac, 1= 0vac
G Thermostat ‘G’ input DI3 J7, 1-2 2 0 = 24vac, 1= 0vac
W2 Thermostat ‘W2’ input DI4 J7, 3-4 4 0 = 24vac, 1= 0vac
W1 Thermostat ‘W1’ input DI5 J7, 5-6 6 0 = 24vac, 1= 0vac
Y2 Thermostat ‘Y2’ input DI6 J7, 7-8 8 0 = 24vac, 1= 0vac
Y1 Thermostat ‘Y1’ input DI7 J7, 9-10 10 0 = 24vac, 1= 0vac
CSB_A1 Compressor A1 current sensor DIG1 J9, 10-12 10=5v, 11=Vin, 12=GND 0 = 5vdc, 1 = 0vdc
CSB_A2 Compressor A2 current sensor DIG2 J9, 7-9 7=5v, 8=Vin, 9=GND 0 = 5vdc, 1 = 0vdc
CSB_B1 Compressor B1 current sensor DIG3 J9, 4-6 4=5v, 5=Vin, 6 =GND 0 = 5vdc, 1 = 0vdc
CSB_B2 Compressor B2 current sensor DIG4 J9, 1-3 1=5v, 2=Vin, 3=GND 0 = 5vdc, 1 = 0vdc
DP_A/SCTA
Circuit A saturated
condensing pressure/temp
AN1 J8, 21-23
21=5v, 22=Vin, 23=GND
(thermistor 21-22)
(0-5vdc, thermistor, ohms)
DP_B/SCTB
Circuit B saturated
condensing pressure/temp
AN2 J8, 24-26
24=5v, 25=Vin, 26=GND
(thermistor 24-25)
(0-5vdc, thermistor, ohms)
SP_A/SSTA
Circuit A saturated
suction pressure/temp
AN3 J8, 15-17
15=5v, 16=Vin, 17=GND
(thermistor 15-16)
(0-5vdc, thermistor, ohms)
SP_B/SSTB
Circuit B saturated
suction pressure/temp
AN4 J8, 18-20
18=5v, 19=Vin, 20=GND
(thermistor 18-20)
(0-5vdc, thermistor, ohms)
RAT Return air temperature AN5 J8, 9-10 9 (thermistor, ohms)
SA_TEMP Supply air temperature AN6 J8, 11-12 11 (thermistor, ohms)
OAT Outdoor air temperature AN7 J8, 13-14 13 (thermistor, ohms)
SPT Space temperature (T55/56) AN8 J8, 1-2 1 (thermistor, ohms)
SPTO Space temperature offset (T56) AN9 J8, 3-4 3 (thermistor, ohms)
IAQ/IAQMINOV IAQ analog input AN10 J8, 5-6 5 (thermistor, ohms)
FLTS Filter Status AN11 J8, 7-8 7 (thermistor, ohms)
OUTPUTS
CMPB2 Compressor B2 RLY 1 J10, 20-21 20 = RLY1A (=RLY2A), 21 = RLY1B 1 = Closes RLY1A/RLY1B
CMPB1 Compressor B1 RLY 2 J10, 22-23 22 = RLY2A (=RLY1A), 23 = RLY2B 1 = Closes RLY2A/RLY2B
CMPA2 Compressor A2 RLY 3 J10, 24-25 24 = RLY3A (=RLY4A), 25 = RLY3B 1 = Closes RLY3A/RLY3B
CMPA1 Compressor A1 RLY 4 J10, 26-27 26 = RLY4A (=RLY3A), 27 = RLY4B 1 = Closes RLY4A/RLY4B
CONDFANB Condenser fan B RLY 5 J10, 10-11 10 = RLY5A (=RLY6A), 11 = RLY5B 1 = Closes RLY5A/RLY5B
CONDFANA Condenser fan A RLY 6 J10, 12-13 12 = RLY6A (=RLY5A), 13 = RLY6B 1 = Closes RLY6A/RLY6B
HS2 Heat stage 2 RLY7 J10, 14-16 14 = 15 = RLY7A, 16 = RLY7B 1 = Closes RLY7A/RLY7B
HS1 Heat stage 1 RLY 8 J10, 17-19 17 = 18 = RLY8A, 19 = RLY8B 1 = Closes RLY8A/RLY8B
HIR Heat interlock relay RLY 9 J10, 4-6 4 = 5 = RLY9A, 6 = RLY9B 1 = Closes RLY9A/RLY9B
SF Supply fan RLY 10 J10, 7-9 7 = 8 = RLY10A, 9 = RLY10B 1 = Closes RLY10A/RLY10B
ALRM Alarm output relay RLY 11 J10, 1-3 1 = 2 = RLY11A, 3 = RLY11B 1 = Closes RLY11A/RLY11B
Fig. 26 — Main Base Board (MBB)
CEPL130346-01 HK 50AA029 CE BO 430346
STATUS
LEN
J1
J2
J4
J3
J5
J6
J7
J8
J9
J10
RED LED - STATUS
GREEN LED-
LEN (LOCAL EQUIPMENT NETWORK)
YELLOW LED -
CCN (CARRIER COMFORT NETWORK)
INSTANCE JUMPER (SET TO 1)
A48-7811