Wire Connections - Source 1 S1-THEH21NS Owner's Manual

OWNER'S MANUAL

Wire Connections

If the terminal designations on your old
thermostat do not match those on the
new thermostat, refer to the chart below
or the wiring diagrams that follow.
Wire from the
old thermostat
terminal marked
C
Rc, R, M, Vr, A
Y1 or Y
W1, W or H
G or F
B
O
Thermal Insulating Sheet
A label is provided on the
backplate that prevents drafts
originating inside the wall from
entering the thermostat.
These drafts, left unchecked, may
cause incorrect room temperature
readings.
Please do not remove this label
from the thermostat. Insert the wires
through the slots provided in the label
as shown in Fig. 1.
S1-THEH21NS
Install on the
new thermostat
Function
connector marked
Common
Power
Cooling
Auxiliary Heat
Fan
Rev. Valve
(Energize to Heat)
Rev. Valve
(Energize to Cool)
C
R
Y
W
G
B
O
Wire Slots
Page 12
C (optional)
R
Y
W
G
B
O