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NOTE
IF SAFETY CIRCUITS ARE IN ONLY ONE OF THE
SYSTEMS, REMOVE THE TRANSFORMER OF THE
SYSTEM WITH NO SAFETY CIRCUITS.
Figure 5. Typical wiring diagram for two transformer systems with NO safety circuits
DEPENDING ON SYSTEM REQUIRE-
MENTS, REPLACE WITH A
75VA TRANSFORMER, IF NEEDED
TWO COMMONS MUST
BE JUMPERED TOGETHER!
CUT AND
TAPE OFF!
C
R
G
B
O
24 VAC
120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
Y1
W2E1
E2
TRANSFORMER
HEAT PUMP SYSTEM AUXILIARY HEATING SYSTEM
W1
24 VAC120 VAC
Hot
Neutral
TRANSFORMER
Changeover
Energized
In Cool
Changeover
Energized
In Heat
Fan
Relay
Compressor
Contactor
Stage 1
Emergency
Relay
Switched
Output
Thermostat
Control
Circuit
Emergency
Relay
Constant
Output
Heat
Relay
Stage 1
Heat
Relay
Stage 2
Limit or
Safety
Switches
Limit or
Safety
Switches