4
Wiring
1 Loosen screw terminals, insert
wires into terminal block, then
re-tighten screws.
2 Push excess wire back into the
wall opening. Keep wires in shaded
area as shown at left.
3 Plug the wall opening with non-
flammable insulation to prevent
drafts from affecting Comfort
Control operation.
Heat/Cool
Heat Pump
NOTES
R & Rc terminals
In single-transformer system, leave metal
jumper in place between R & Rc. Remove
metal jumper if two-transformer system.
B terminal
B is the common wire terminal.
W (O) terminal
If Comfort Control is configured for a heat
pump in the Installer Setup, changeover valve
is configured for cool (“O” factory setting).
F terminal (Output)
Heat pump reset. F terminal powered continu-
ously when Comfort Control is set to Em Heat.
Configure Comfort Control for 2 heat/1 cool
heat pump in the Installer Setup.
Wire specifications
Use 18- to 22-gauge Comfort Control wire.
Shielded cable is not required.
Keep wires in this
shaded area
CAUTION: ELECTRICAL HAZARD. Can cause electrical shock or equipment damage.
Disconnect power before wiring.
Wiring
Terminal Designations
Conventional Terminal Letters:
Y2 2nd stage compressor contactor
W2 2nd stage heat relay
GFan relay
W1st stage heat relay
BCommon wire from secondary side of
cooling system transformer
Y1st stage compressor contactor
RHeating power. Connect to secondary
side of heating system transformer.
Rc Cooling power. Connect to secondary
side of cooling system transformer.
Heat Pump Terminal Letters:
FHeat pump reset. F terminal powered
continuously when System is set to
Em Heat.
X2 Emergency heat relay
W1 Auxiliary heat relay
GFan relay
OChangeover valve for heat pumps
BCommon wire from secondary side of
cooling system transformer.
YCompressor contactor
RHeating power. Connect to secondary
side of heating system transformer.
Rc Cooling power. Connect to secondary
side of cooling system transformer.
