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3.6. WIRING DIAGRAMS
2 + 3 WIRE HEATING SYSTEMS
JUMPER
PROVIDED
W
Y
G
B
W
G
H
F
4
NOTE: "G" WIRE IS
OMITTED FOR
2 WIRE SYSTEMS
HEATING/COOLING SYSTEMS
5 + 6 Wire 2 Transformers
W
Y
G
B
W
Y
G
B*
H
C*
F
4
6
WIRING DIAGRAM NOTES (APPLIES TO ALL DRAWINGS)
* The DASHED lines are optional depending upon your system type.
* Verify whether "C", "X" or "B" wires are connected to system common.
* If "B" and "O" are both present, it is likely that "B" is a system common.
* If a "B" wire in your system is a common, then connecting it to the "B" terminal may cause damage
to your system.
* If "Y" and "C" are both present, it is likely that "C" is a system common.
* Use an optional common wire to allow the system to power your thermostat.
O
RC
RH
C
RH
RC
R
V
5
JUMPER
REMOVED
O
RC
RH
C
O
RC
RH
R
V
5
COOLING SYSTEMS
JUMPER
PROVIDED
W
Y
G
Y
G
C*
F
6
HEATING/COOLING SYSTEMS
4 + 5 Wire 1 Transformers
JUMPER
PROVIDED
W
Y
G
W
Y
G
H
C*
F
4
6
9
B
O
RC
RH
C
RH
R
V
B
O
RC
RH
C
B*
O
RH
RC
R
V
5
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