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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
screw anchors 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 CUR-
RENT RATINGS. FIRE, PERSONAL INJURY, AND/
OR EQUIPMENT DAMAGE COULD RESULT.
O
B
CHANGEOVER
ENERGIZED
IN HEAT
CHANGEOVER
COMPRESSOR
ENERGIZED
CONTACTOR
IN COOL
4
The following wiring diagrams show typical terminal
identification and wiring. For proper installation, refer to
the original manufacturers' instructions.
Y1
Y2
G
COMPRESSOR
CONTACTOR
STAGE 2
FAN
RELAY
STAGE 1
Figure 4. Typical wiring diagram for single transformer systems
TABLE 2. WIRE IDENTIFICATION LABELS
1
2
G
C
G
C
1
2
9
10
Y1
Y2
Y1
Y2
9
10
To prevent electrical shock and/or equipment
damage, disconnect electrical power at the main
fuse box until installation is complete. Verify
power is off with a voltmeter.
NOTE
W1
W2
A1
HEAT
DAMPER
RELAY
STAGE 1
HEAT
RELAY
STAGE 2
3
4
5
6
L
R
O
B
L
R
O
B
3
4
5
6
11
12
13
14
W1
W2
A1
S1
W1
W2
A1
S1
11
12
13
14
CAUTION
!
THERMOSTAT
CONTROL
CIRCUIT
THERMOSTAT
R
C
SYSTEM
24 VAC
7
8
E1
E2
E1
E2
7
8
15
16
S2
S3
S2
S3
15
16
HOT
120 VAC
NEUTRAL
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