Specifications

20
Table 2 — MBB Channel Assignments
LEGEND
YAC — Gas Heat Unit (48A)
Table 3 — ECB1 Channel Assignments
POINT NAME POINT DESCRIPTION TYPE OF I/O
I/O POINT
NAME
CONNECTOR
PIN NO.
INPUTS
GAS.S YAC Indoor Fan Relay (Fan Request from YAC) Switch Input DI1 J6, 3-4
FDWN Fire Shutdown Switch Input Switch Input DI2 J6, 5-6
G Thermostat 'G' Input / Remote Occupied 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
CS.A1 Compressor A1 Current Sensor Digital Input DIG1 J9, 10-12
CS.A2 Compressor A2 Current Sensor Digital Input DIG2 J9, 7-9
CS.B1 Compressor B1 Current Sensor Digital Input DIG3 J9, 4-6
CS.B2 Compressor B2 Current Sensor Digital Input DIG4 J9, 1-3
SCT.A Circuit A Saturated Condensing Temperature 5 K Thermistor AN1 J8, 21-22
SCT.B Circuit B Saturated Condensing Temperature 5 K Thermistor AN2 J8, 24-24
SST.A Circuit A Saturated Suction Pressure Press Transducer AN3 J8, 15-17
SST.B Circuit B Saturated Suction Pressure Press Transducer AN4 J8, 18-20
RAT Return Air Temperature 10K Thermistor AN5 J8, 9-10
EDT Evaporator Discharge Air Temperature 10K Thermistor AN6 J8, 11-12
OAT Outdoor Air Temperature 10K Thermistor AN7 J8, 13-14
SPT Space Temperature (T55/56) 10K Thermistor AN8 J8, 1-2
SPTO Space Temperature Offset (T56) 10K Thermistor AN9 J8, 3-4
IAQ, IAQ.R, ECO.P IAQ Analog Input 4-20 mA AN10 J8, 5-6
FIL.S Filter Status Switch Input AN11 J8, 7-8
OUTPUTS
B2 Compressor B2 Relay RLY 1 J10, 20-21
B1 Compressor B1 Relay RLY 2 J10, 22-23
A2 Compressor A2 Relay RLY 3 J10, 24-25
A1 Compressor A1 Relay RLY 4 J10, 26-27
OFC.B Condenser Fan B Relay RLY 5 J10, 10-11
OFC.A Condenser Fan A Relay RLY 6 J10, 12-13
HS.2 Heat Stage 2 Relay RLY7 J10, 14-16
HS.1 Heat Stage 1 Relay RLY 8 J10, 17-19
HIR Heat Interlock Relay Relay RLY 9 J10, 4-6
S.FAN Supply Fan Relay RLY 10 J10, 7-9
ALR Alarm Output Relay Relay RLY 11 J10, 1-3
POINT NAME POINT DESCRIPTION I/O TYPE I/O POINT NAME
CONNECTOR
PIN NO.
INPUTS
RE.MT Remote Occupancy Switch DI1 J4, 1-2
E.ENA Economizer Enable Switch DI2 J4, 3-4
RA.RH Return Air Relative Humidity 4-20 mA AN1 J5, 1-3
OA.RH Outdoor Air Relative Humidity 4-20 mA AN2 J5, 4-6
OUTPUTS
EC.AP Economizer Actuator (Analog Control) 4-20 mA AO1 J9, 1-2
EC.AP Economizer Actuator (Digital Control) Digital PP/MP J7, 1-3
PE.A Power Exhaust Stage A Relay RLY1 J8, 1-3
PE.B Power Exhaust Stage B Relay RLY 2 J8, 4-6
PE.C Power Exhaust Stage C Relay RLY 3 J8, 7-9
E.PWR Economizer Power Relay RLY 6 J8, 16-18