Instruction manual

C. Defrost
The Smart Heat PCB stages the correct amount of supplemental heat during defrost. If too much heat is added, the system will stay in defrost for
the completion of the defrost cycle even though the thermostat is satisfied. On the next cycle, 1 less element will be energized during the next
defrost period.
D. Diagnostic LED
The PCB of the Smart Heat option heater package contains a microprocessor which controls fan operation, fan speed, outdoor unit, and heater
elements. For troubleshooting, a service LED indicates the condition of the PCB. See Table 7 for LED flash codes.
Fig. 6—System Wiring Diagram Using A Corporate Model Heat Pump Indoor Thermostat, With 1 Outdoor Thermostat
A97218
R
C
Y
G
O
W2D
W2T
W3
Y
0
R
C
O
W2
Y
INDOOR
CONTROL
BOARD
OUTDOOR
SPLICE
ODT
CUT
JW1
R
C
Y/Y2
G
O/W2
W/W1
24 VAC HOT
24 VAC COMM
COOL / HEAT
STAGE 1
FAN
RVS COOLING
HEAT STAGE 2
MODEL HP
THERMOSTAT
SINGLE-SPEED HEAT
PUMP DEFROST BOARD
Fig. 5—System Wiring Diagram Using A Typical Indoor Heat Pump Thermostat, With 1 Outdoor Thermostat
A94129
R
C
Y
G
O
W2D
W2T
W3
Y
0
R
C
Y
G
O
E
W2
L
R
C
O
W2
Y
L
TYPICAL
HEAT PUMP
THERMOSTAT
INDOOR
CONTROL
BOARD
OUTDOOR
SPLICE
ODT
CUT
JW1
SINGLE-SPEED
HEAT PUMP
DEFROST BOARD
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