Wiring Diagrams - White Rodgers 1F85-275 Installation Instructions Manual

O B Y2
Reversing
Valve
Reversing 2nd Stage
Energized in
Valve Compressor
Heat, Off,
Energized in
Emergency
Cool Mode
Mode
Figure 4. Typical wiring diagram for two transformer heat pump systems with safety circuits in BOTH systems
Refer to equipment manufacturers' instructions for specific
system wiring information.
You can configure the thermostat for use with the following
heat pump system types:
HEAT PUMP TYPE 1 HEAT PUMP TYPE 1 HEAT PUMP TYPE 1. Single stage compressor system; gas HEAT PUMP TYPE 1 HEAT PUMP TYPE 1
or electric backup.
This thermostat is designed to operate a single-transformer
system. If you have a two-transformer system, cut and tape off
SYSTEM SYSTEM SYSTEM SYSTEM SYSTEM L L L L L
Heat Malfunction 24 Volt
Pump 1 Light (Common)
Heat
Pump 2
O
Reversing
Valve
Energized in
Cool Mode
Figure 5. Typical wiring diagram for single transformer multi-stage 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.
Y1 G W2
Emergency
Fan
or 1st Aux.
Stage Relay
Relay
Aux
Compressor
Relay
Contactor
(Stage 2)
TWO COMMONS MUST
BE JUMPERED TOGETHER!
Heat Pump Terminal Outputs Heat Pump Terminal Outputs Heat Pump Terminal Outputs
Heat Pump Terminal Outputs Heat Pump Terminal Outputs
THERMOSTAT TERMINALS (HEAT PUMP) THERMOSTAT TERMINALS (HEAT PUMP) THERMOSTAT TERMINALS (HEAT PUMP) THERMOSTAT TERMINALS (HEAT PUMP) THERMOSTAT TERMINALS (HEAT PUMP)
C C C C C R R R R R W2 W2 W2 W2 W2 E/W1 E/W1 E/W1 E/W1 E/W1
24 Volt Heat Mode Heat mode
(Hot) 3rd stage 2nd stage
Emergency
mode Emergency
2nd stage Mode
1st stage
Y2
B Y1
Compressor
Contactor
Reversing
Stage 2
Valve
Energized in
Heat Mode
Compressor
Off Emergency
Contactor
Stage 1
NOTE
E/W1
C L
R
SYSTEM
MONITOR
SWITCH
Limit or
Safety
Switches
COMMON
one transformer. If transformer safety circuits are in only one of
the systems, remove the transformer of the system with NO
safety circuits. If required, replace remaining transformer with
a 75VA Class II transformer. After disconnecting one trans-
former, the two commons must be jumpered together.
Use the terminal output information below to help you wire the
thermostat properly for your multi-stage system. After wiring,
CONFIGURATION CONFIGURATION
see CONFIGURATION CONFIGURATION CONFIGURATION section for proper thermostat configu-
ration.
Y2 Y2 Y2 Y2 Y2 Y1 Y1 Y1 Y1 Y1
No Heat and
Output Cool mode
or 1st stage
2nd (compressor) Set GAS/ELEC switch
stage
compressor
E/W1
G W2 C
Heat
Relay
Stage 1
Heat
Fan
Relay
Relay
Stage 2

WIRING DIAGRAMS

WIRING DIAGRAMS
WIRING DIAGRAMS WIRING DIAGRAMS WIRING DIAGRAMS
THERMOSTAT
SYSTEM
Limit or
Safety
Limit or
Switches
Safety
24 VAC
120 VAC
Switches
24 VAC Auxiliary
ACCESSORY Heating
RELAY N.O. Transformer
The accessory relay scheme
CONTACT (Class II
is required
Current Limited)
circuits exist in both systems.
COMMON
Limit or
Safety
Switches
24 VAC 120 VAC
NEUTRAL
Heat Pump Transformer
(Class II Current Limited)
G G G G G O O O O O
Blower/Fan Energized Energized Energized
on call for Heat in Cool
and Cool Mode
for Emergency mode
THERMOSTAT
R
SYSTEM
Hot
24 VAC 120 VAC
Neutral
TRANSFORMER
(Class II, Current Limited)
HOT
NEUTRAL
NOTE
when safety
HOT
B B B B B
in Heat
OFF
Emergency
mode
3