835961-UIM-A-0112
Johnson Controls Unitary Products
7
FIELD CONNECTIONS CONTROL WIRING
1.
Route low voltage wiring into bottom of control box as shown in
Figures 6 or 7. Make low voltage wiring connections inside the low
voltage box per Figures 8-9.
2.
The complete connection diagram and schematic wiring label is
located on the inside surface of the unit service access panel.
3.
Replace the control box cover removed in Step 2.
4.
All field wiring to be in accordance with national electrical codes
(NEC) and/or local-city codes.
5.
Mount the thermostat about 5 ft. above the floor, where it will be
exposed to normal room air circulation. Do not place it on an out-
side wall or where it is exposed to the radiant effect from exposed
glass or appliances, drafts from outside doors or supply air grilles.
6.
Route the 24-volt control wiring (NEC Class 2) from the outdoor
unit to the indoor unit and thermostat.
FIGURE 6:
Outdoor Unit Control Box - Single Phase
FIGURE 7:
Outdoor Unit Control Box - Three Phase
Start
Relay
(Optional)
Defrost
Control
Board
Start Capacitor
(Optional)
Ground
Lug
“Fingered”
Bushing
Low
Voltage
Box
Reversible High
Voltage Conduit Plate
Contactor
Dual
Run/Fan
Capacitor
Fan
Relay
Defrost
Control
Board
Ground
Lug
“Fingered”
Bushing
Low
Voltage
Box
Reversible High
Voltage Conduit Plate
Contactor
Fan
Capacitor
To eliminate erratic operation, seal the hole in the wall at the ther-
mostat with permagum or equivalent to prevent air drafts affecting
the operation of in the thermostat.
A Start Assist Kit is available and recommended for long line set
applications or in areas of known low voltage problems.
NOTICE
FIGURE 8:
Typical Field Wiring (Air Handler / Electrical Heat) - (Three Phase)
THERMOSTAT
INDOOR UNIT
OUTDOOR UNIT
LOW VOLTAGE TERMINAL BLOCK
IN AIR HANDLER WITH ELECTRIC HEAT
3,4
DEFROST
CONTROL
1
FIELD
INSTALLED
JUMPER
GND.
SCREW
CONTACTOR
T2
T1
L2
L1
M
R
Y
O
W
G
T
2
E
2
R
R
Y
Y
O
O
W2
W
C
X
G
W1
GND.
LUG
POWER WIRING
24V CONTROL WIRING
(NEC CLASS 2)
JUMPER TERMINALS E AND W TO HEAT
ON FIRST STAGE DURING EMERGENCY HEAT.
1
2
TERMINAL NOT USED ON ALL THERMOSTATS.
POWER WIRING
208/230-3-60
460-3-60
3
CHECK THE LOW VOLTAGE TERMINAL BLOCK ON THE INDOOR UNIT FOR THE ACTUAL ARRANGEMENT OF THE TERMINALS.
4
CONNECT POWER WIRING TO TERMINAL BLOCK 3TB ON UNITS WITHOUT ELECTRIC HEAT OR CIRCUIT BREAKER.
ALL FIELD WIRING TO BE IN ACCORDANCE WITH ELECTRIC CODE (NEC) AND/OR LOCAL CODES
RED
BLK
YEL
ORG
BRN
PUR
WHT
POWER
SUPPLY
208/230-3-60
460-3-60
T3
L3
W1/66
B or C
L or X
B or C