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69-0638—1 4
Connect the wires to the corresponding terminals on the
subbase (ordered separately). If labels do not agree with your
new subbase, refer to Table 2 and the installation instructions
furnished with the subbase.
NOTE: If wiring a dual transformer system, only the O or
the B terminal may be used.
Push excess wire back into the wall.
Plug the hole in wall with nonhardening caulk, putty, or
nonflammable insulation to prevent drafts from affecting
thermostat operation.
Fig. 5—Methods of connecting terminals.
BARRIER
FOR WRAPAROUND
CONNECTION—
STRIP 7/16 in. [11 mm]
FOR STRAIGHT
CONNECTION—
STRIP 5/16 in. [8 mm]
M1556B
TABLE 2—TERMINAL DESIGNATIONS.
Subbase
Terminal
Control
Function
R Control transformer power.
R
c
Line side of 24V power supply;
cooling side, 2 transformer heat-cool
system.
R
h
Line side of 24V power supply;
heating side, 2 transformer heat-cool
system.
W Heating control circuit.
Y Cooling control circuit; jumper to W
for heat pump compressor control if
no P terminal on subbase.
G Fan control circuit.
C Clock control (transformer common).
O Cooling damper or changeover/
reversing valve, makes continuously
in cool.
B Heating damper or changeover/
reversing valve, makes continuously
in heat.
P Heat pump contactor; P terminal on
some models only.
Hang the thermostat base on the wallplate or subbase.
Insert the two captive mounting screws located in the bot-
tom corners of the base (Fig. 6).
Firmly tighten the screws.
INSERT CLOCK BATTERIES
Power is supplied to the clock by the 24-Vac transformer.
Backup batteries (not included) may be installed to supply
power to the clock if power is interrupted.
Install the batteries in the thermostat (Fig. 7).
Once a year or when batteries are dead, replace with two
new AAA alkaline batteries. Properly dispose of old batter-
ies. We recommend Energizer
®
batteries.
Fig. 6—Thermostat mounting.
MOUNT THE THERMOSTAT
Note the tabs on the top inside edge of the thermostat
base. These tabs fit the slots molded into the top of the wall-
plate or subbase.
TAB (2)
MOUNTING SLOT (2)
CAPTIVE
MOUNTING SCREWS
THERMOSTAT
BASE
WALLPLATE
OR SUBBASE
35
30
25
20
10
12
11
10
9
8
7
6
5
4
3
2
1
12
1
1
10
9
8
7
6
M8584
Fig. 7—Insert clock batteries.
BATTERY LOCATION FOR
(2) AAA BATTERIES;
INSTALL WITH POSITIVE
ENDS UP
M7188