518674-YIM-C-0610
Johnson Controls Unitary Products 19
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 to the unit. Refer to Table 7 for control wire sizing
and maximum length.
Figure 23: Typical Electronic Thermostat Field Wiring
Figure 24: Typical Field Wiring 24 Volt Thermostat
Table 7: Control Wire Sizes
Wire Size Maximum Length
1
1. From the unit to the thermostat and back to the unit.
18 AWG 150 Feet
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.
W2
RC
RH
Y1
Y2
W1
G
C
X1
X3
X4
A1
A2
T
T
W2
Y1
Y2
W1
G
C
OCC
X
R
2
TO REMOTE SENSOR
2ET04701324 IF USED
24 Volt
Transformer
THERMOSTAT
1
TERMINALS
UNIT TERMINALS
STRIP TB1
1
Electronic programmable Thermostat 2ET0770010024 (includes subbase).
2
Terminals A1 and A2 provide a relay output to close the outdoor economizer
dampers when the thermostat switches to the set-back position.
OCC
W1
W2
Y1
G
Y2
X
R
SD
C
REMOTE
MIN POS
W1
W2
Y1
G
Y2
C
RH
RC
UNIT CONTROL
BOARD
T-STAT
To Next Page
Loading...
