Wiring Diagrams - White Rodgers 1F85-277 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
*The 24 volt neutral connection to terminal C on the thermostat is not required if you replace the batteries once a year with fresh "AA" Energizer
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 HEAT PUMP TYPE 1 HEAT PUMP TYPE 1. Single stage compressor system; gas
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 C* C* C* C* C*
Heat Malfunction 24 Volt
Pump 1 Light (Common) (Hot) Emergency
Heat
Pump 2
*The 24 volt neutral connection to terminal C on the thermostat is not required if you replace the batteries once a year with fresh "AA" Energizer
O
Reversing
Valve
Energized in
Cool Mode
Figure 5. Typical wiring diagram for single transformer multi-stage systems
*The 24 volt neutral connection to terminal C on the thermostat is not required if you replace the batteries once a year with fresh "AA" Energizer
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
Relay
Aux
Compressor
Heat
Contactor
Relay
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)
R R R R R W2 W2 W2 W2 W2 E/W1 E/W1 E/W1 E/W1 E/W1
24 Volt HP 1 and Emergency
Mode
2nd stage 1st stage
HP 2
3rd stage
B Y1 Y2
Compressor
Contactor
Reversing
Stage 2
Valve
Energized in
Heat Mode
Compressor
Off Emergency
Contactor
Stage 1
NOTE
E/W1
*
C L
R
SYSTEM
Heat
MONITOR
Relay
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 heat pump system. After wiring, see
CONFIGURATION CONFIGURATION
CONFIGURATION section for proper thermostat configuration. CONFIGURATION CONFIGURATION
Y2 Y2 Y2 Y2 Y2 Y1 Y1 Y1 Y1 Y1
No Heat and
Output Cool mode
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 when safety
Current Limited)
circuits exist in both systems.
COMMON
Limit or
Safety
Switches
24 VAC 120 VAC
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
HOT
NEUTRAL
alkaline batteries.
B B B B B
in Heat
OFF
Emergency
mode
alkaline batteries.
alkaline batteries.
3