Wiring Diagrams; Thermostat Terminals - White Rodgers 1F85-277 Instructions Manual

WIRING DIAGRAMS
= I
Polarity must be observed, tf the HOT side of the second transformer
is jumpered to the COMMON side of the first transformer a short will
be made, Damage to equ pment w occur when power s restored,
E/W1
SYSTE
2t
..... _ _" TWO COMMONS MUST
BE JUMPERED TOGETHER!
THERMOSTAT
L
I -- -- -- ] 24 VAC Auxiliary
/ , 2_bi 24VACRy
Heating
/ ',
-I-- _ I'*'_ RELAY NO. transf ..... Zh ......... y relay scheme
l I l p II CONTACT
(Claspl!
l is required when safety
/
"-h fl--' CMMCN C ..... t Limited) I circuits exist in both syst ....
%0
HOT
Heat Pump Transformer
(Class II Current Limited)
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 ifyou replace the batteries once a year with fresh "AA" EnergizeP alkaline battenes.
Heat Pump Terminal Outputs
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. 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
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 section for proper thermostat configuration.
SYSTEM
Heat
Pump 1
Heat
Pump 2
L
Malfunction
Light
Ct
24 Volt
(Common)
R
24 Volt
(Hot)
THERMOSTAT TERMINALS (HEAT PUMP)
W2
HP 1 and
Emergenc_
2nd stage
HP2
3rd stage
E/W1
Emergency
Mode
1st stage
Y2 Y1
No Heat and
Output Cool mode
1st stage
2nd (compressor)
stage
compressor
G
Blower/Fan Energized
on call for Heat
and Cool
Set GAS/ELEC switch
for Emergency mode
O
Energized
in Cool
Mode
B
Energized
in Heat
OFF
Emergency
mode
*The 24 volt neutral connection to terminal C on the thermostat is not required ifyou replace the batteries once a year with fresh "AA" EnergizeP alkaline battenes.
i_rlPi !i: _ _24 V_(class ii, Current Lirnited)
Figure 5. Typical wiring diagram for single transformer multi-stage systems
*The24voltneutral c onnection toterminal C on thethermostat i s notrequiredifyou replacethe batteries onceayearwithfresh"AA"EnergizeP alkalinebatteries.