White Rodgers 1F92W-51 Installation & Operation Manual page 14

NOTE
IF SAFETY CIRCUITS ARE IN ONLY ONE OF THE
SYSTEMS, REMOVE THE TRANSFORMER OF THE
SYSTEM WITH NO SAFETY CIRCUITS.
CUT AND
TAPE OFF!
Hot
120 VAC
Neutral
TRANSFORMER
Figure 5. Typical wiring diagram for two transformer systems with NO safety circuits
14
B
O Y1
Changeover
Energized
In Heat
24 VAC
Changeover Compressor
Energized Contactor
In Cool Stage 1
HEAT PUMP SYSTEM
TWO COMMONS MUST
BE JUMPERED TOGETHER!
G W1 E1 E2
Emergency
Fan
Relay
Switched
Relay
Output
Stage 2
Emergency
Heat
Relay
Relay
Constant
Stage 1
Output
AUXILIARY HEATING SYSTEM
DEPENDING ON SYSTEM REQUIRE-
Thermostat
Control
Circuit
THERMOSTAT
C
W2 R
SYSTEM
Heat Limit or
Relay Safety
Switches
TRANSFORMER
Hot
24 VAC 120 VAC
Neutral
MENTS, REPLACE WITH A
75VA TRANSFORMER, IF NEEDED
Limit or
Safety
Switches