16
FRIEDRICH! This terminal must be connected to transformer common.
# Leave factory-installed jumper in place.
$ Tape off the end of the wire. Jumper is not required on this
thermostat (CT70).
Wiring
terminal
function
Existing
thermostat
wiring
New
thermostat
wiring
COMMON
POWER
COMPRESSOR
1ST STG.
HEAT
AUX. HEAT
FAN
C/O VALVE
HEAT
C/O VALVE
COOL
SYSTEM
MONITOR
EM. HEAT
W1
W2 W2
G G
2
X
1
X2 E
1
R
Y Y1
W1
B B
U3
RC
RHor
C
Y1 O
L L
or
X1X or or
Y2
E
O
W3
or
or
or