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Wiring
terminal
function
COMMON
POWER
COMPRESSOR
1ST
STG.
HEAT
AUX. HEAT
FAN
C/O VALVE
HEAT
C/O VALVE
COOL
EM. HEAT
Existing
thermostat
wiring
*
*
*
a>.,
(j+
@
0
New
thermostat
wiring
4m
4
zm
*
*
*
(3
*
0
Notes
Jumper these two terminals if both are present.
FA
This terminal must be connected to transformer common.
H
Remove this factory-installed jumper for independent stage
1
heat and cool connection.
Wiring
terminal
function
COMMON
POWER
COMPRESSOR
1*T
STG.
HEAT
AUX. HEAT
FAN
CIO VALVE
HEAT
C/O VALVE
COOL
SYSTEM
MONITOR
EM. HEAT
VlULTlPLE AUX.
HEAT LOADS
Existing
thermostat
wiring
*
@.
.
.
.
. .
.
New
thermostat
wiring
Notes
0
This
terminal must be connected to transformer common
H
Leave factory-installed jumper in place.
El
Connect multiple second stage heating loads
to
WZ
terminals.
12
13