507581-04 Page 43 of 60Issue 2128
3/16” QUICK CONNECT TERMINALS THERMOSTAT CONNECTIONS (TB1)
FLAME SENSE SIGNAL DS = DEHUMIDIFICATION SIGNAL
HI Cool 24VAC W2 = HEAT DEMAND FROM 2ND STAGE T/STAT
HI HEAT 24VAC W1 = HEAT DEMAND FROM 1ST STAGE T/STAT
LO COOL 24VAC R = CLASS 2 VOLTAGE TO THERMOSTAT
LO HEAT 24VAC G = MANUAL FAN FROM THERMOSTAT
PAR
C = THERMOSTAT SIGNAL GROUND CONNECTED TO
TRANSFORMER GRD (TR) & CHASSIS GROUND (GRD)
PAR
COMMON 24VAC Y1 = THERMOSTAT 1ST STAGE COOL SIGNAL
1/4” QUICK CONNECT TERMINALS Y2 = THERMOSTAT 2ND STAGE COOL SIGNAL
NEUTRALS = 120 NEUTRAL O = THERMOSTAT SIGNAL TO HEAT PUMP
HUM = UNPOWERED NORMALLY OPEN (DRY) CONTACTS REVERSING VALVE
LI = 120 VAC INPUT TO CONTROL L = NOT USED
ACC = 120 VAC OUTPUT TO OPTIONAL ACCESSORY DH = NOT USED
Figure 65. Control Board
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