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2. Connect wires beneath terminal screws on sub-
base using appropriate wiring schematic (see figs.
3 through 6).
3. Place subbase over hole in wall and mark mounting
hole locations on wall using subbase as a template.
4. Move subbase out of the way. Drill mounting holes.
5. Fasten subbase loosely to wall, as shown in fig. 3,
using two mounting screws. Place a level against
bottom of subbase, adjust until level, and then tighten
screws. (Leveling is for appearance only and will not
affect thermostat operation.) If you are using existing
mounting holes, or if holes drilled are too large and do
not allow you to tighten subbase snugly, use plastic
expansion plugs to secure subbase.
6. Push excess wire into wall and plug hole with a fire-
resistant material (such as fiberglass insulation) to
prevent drafts from affecting thermostat operation.
WARNING
!
DO NOT EXCEED MAXIMUM VOLTAGE OR
CURRENT RATINGS. FIRE, PERSONAL IN-
JURY, AND/OR EQUIPMENT DAMAGE COULD
O
B
Y1
Changeover
Energized
In Heat
Changeover
Compressor
Energized
Contactor
In Cool
Stage 1
4
power is off with a voltmeter.
The following wiring diagram shows typical terminal iden-
tification and wiring. For proper installation, refer to the
original manufacturers' instructions.
Y2
G
E2
Emergency
Compressor
Relay
Contactor
Constant
Stage 2
Output
Emergency
Fan
Relay
Relay
Switched
Output
Figure 4. Typical wiring diagram for single transformer systems
Mounting
hole
9-pin connector
Pull wires through
this opening
RESULT.
To prevent electrical shock and/or equipment
damage, disconnect electrical power at the main
fuse box until installation is complete. Verify
NOTE
Thermostat
E1
W1
W2
A1
Heat
Damper
Relay
Motor
Stage 1
Heat
Relay
Stage 2
Expansion
Connect wires under
terminal screws
S1 S2 S3
O
W1
4-pin connector
B
E1
Y1
E2
Y2
L
C
R
G
W2
A1
Figure 3. Subbase
CAUTION
!
Malfunction
Light
Control
Circuit
THERMOSTAT
C
L
R
SYSTEM
System
Monitor
Switch
24vAC
TRANSFORMER
plugs
Mounting
hole
Hot
120vAC
Neutral
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