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1183875-YIM-A-1014
Thermostat Wiring (Not applicable to units with VFD)
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 should be used to connect the
THERMOSTAT
TERMINALS
W1
W2
1
Y1
Y2
G
R
3
C
RC
4
OCC
5
X
TERMINALS ON A
LIMITED NUMBER
OF THERMOSTATS
Second stage
1
Jumper is required if there is no Smoke Detector circuit.
2
Jumper is required for any co
3
OCC is an output from the thermostat to indicate the Occupied
4
X is an input to the thermostat to display Error Status condi ons.
5
Figure 24: Typical Electronic Thermostat Field Wiring
20
ot required on single stage he
g units.
of R, RC, or RH.
thermostat to the unit. Refer to Table 7 for control wire sizing
and maximum length.
Table 7: 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
Y2
OCC
X
R
SD-24
C
C
24V
SD-24
Jumper Located on Harness
(If No Smoke Detector)
SD-R
R
on.
208/230-3-60 and 380/415-3-50 units control
transformers are factory wired for 230v and 415v power
supply respectively. Change tap on transformer for 208-
3-60 or 380-3-50 operation. See unit wiring diagram.
Maximum Length
150 Feet
Smoke
Detector
24 VAC
Class 2
2
(If Smoke Detector Is Used)
24V Output
Johnson Controls Unitary Products
1
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