![background image](http://html.mh-extra.com/html/carrier/p374-1100/p374-1100_installation-instructions-manual_2564104006.webp)
Sample Wiring Diagrams
Thermostat
Thermostat
Page 5
R
C
G
Y1
Y2
W1
W2
O
E
L
R
C
G
Y1
Y2
W1
W2
O
24 vac common
24 vac return
fan relay
compressor relay
1st stage heat circuit
R
C
G
Y1
Y2
W1
W2
O
E
L
R
C
G
Y1
Y2
W1
W2
O
24 vac return
fan relay
compressor relay
1st stage heat circuit
5 Wire, 1 Stage Cooling, 1 Stage Gas Heat
4 Wire, 1 Stage Cooling, 1 Stage Gas Heat
Residential Gas or Electric Heat
*
,
Electric Cool, split systems & package
units
Residential Gas or Electric Heat
*
,
Electric Cool, split systems & package
units
*
If using electric heat this option must be
selected on during advanced setup.
*
If using electric heat this option must be
selected on during advanced setup.