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178113-BIM-D-0906
Thermostat Wiring
The thermostat should be located on an inside wall approximately
56 inch above the floor where it will not be subject to drafts, sun
exposure or heat from electrical fixtures or appliances. Follow the
manufacturer's instructions enclosed with thermostat for general
installation procedure. Seven (7) color-coded, insulated wires
THERMOSTAT
TERMINALS
W1
W2
1
Y1
Y2
Y3
Y4
G
R
C
3
RC
4
OCC
5
X
TERMINALS ON
A LIMITED
NUMBER OF
THERMOSTATS
Figure 12: Field Wiring 24 Volt Thermostat
Unitary Products Group
1
Second stage heating not required on single stage heating units.
2
Jumper is required if there is no Smoke Detector circuit.
3
Jumper is required for any combination of R, RC, or RH.
4
OCC is an output from the thermostat to indicate the Occupied condition.
5
X is an input to the thermostat to display Error Status conditions.
should be used to connect the thermostat to the unit. Refer to
Table 6 for control wire sizing and maximum length.
Table 6: Control Wire Sizes
Wire Size
18 AWG
1. From the unit to the thermostat and back to the unit.
CONTROL
TERMINAL
BLOCK
W1
W2
Y1
G
OCC
P
P1
Y2
X
R
SD
R
C
SD
EXPANSION
SD
BOARD
TERMINAL
C
BLOCK
Y3
Y4
Maximum Length
150 Feet
Smoke
Detector
2
Jumper
24 VAC
Class 2
1
15
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