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Caution – White Rodgers 1F92W-51 User Manual

Page 15

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Figure 6. Typical wiring diagram for two transformer systems with safety circuits in BOTH systems

TWO COMMONS MUST

BE JUMPERED TOGETHER!

C

R

G

B

O

THERMOSTAT

SYSTEM

Y1

W2

E1

E2

HEAT PUMP SYSTEM

AUXILIARY

HEATING SYSTEM

W1

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

24 VAC

120 VAC

Hot

Neutral

HEAT PUMP

TRANSFORMER

24 VAC

120 VAC

Hot

Neutral

AUXILIARY

HEATING

TRANSFORMER

24 VAC

Accessory
Relay N.O.

Contact

Limit or

Safety

Switches

Limit or

Safety

Switches

Limit or

Safety

Switches

Limit or

Safety

Switches

NOTE

Relay contacts shown are thermostatically operated. The
accessory relay scheme is required when safety circuits
exist in both systems.

Polarity must be observed. If the HOT
side of the second transformer is
jumpered to the COMMON side of the
first transformer a short will be made.

Damage to equipment will occur when
power is restored.

CAUTION

!