126115-UIM-D-0306
Unitary Products Group
7
FIELD CONNECTIONS CONTROL WIRING
1.
Route low voltage wiring into bottom of control box as shown in
Figure 6. Make low voltage wiring connections inside the low volt-
age box per Figures 7-9.
2.
The complete connection diagram and schematic wiring label is
located on the inside surface of the unit service access panel.
3.
Replace the corner cover removed in Step 2.
4.
All field wiring to be in accordance with national electrical codes
(NEC) and/or local-city codes.
NOTE: A Start Assist Kit is available and recommended for long line set
applications or in areas of known low voltage problems.
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.
NOTE: To eliminate erratic operation, seal the hole in the wall at the
thermostat with permagum or equivalent to prevent air drafts
affecting the operation of in the thermostat.
FIGURE 7: Typical Air Handler Thermostat Wiring
FIGURE 8: Typical Furnace Thermostat Wiring
VARIABLE
SPEED
AIR HANDLER
AIR
CONDITIONER
C
Y
R
W
G
C
Y
R
O
CONTACTOR
COIL
CONTACTOR
COIL
Y1
W2
W1
G
HUM
Y2
X/L
X/L
1
2
1
HUMIDISTAT CONTACTS OPEN ON HUMIDITY RISE.
HUMIDISTAT JUMPER ON CFM SELECTION BOARD MUST BE REMOVED.
2
Y1, Y2, X/L, AND HUM LOCATED ON CFM SELECTION BOARD.
THERMOSTAT
1
VARIABLE
SPEED
FURNACE
C
Y
R
W
HUMIDISTAT CONTACTS OPEN ON HUMIDITY RISE.
HUMIDISTAT JUMPER ON CFM SELECTION BOARD
MUST BE REMOVED.
G
C
Y
R
O
Y1
W2
W1
G
HUM
Y2
X/L
1
THERMOSTAT
AIR
CONDITIONER
CONTACTOR
COIL
CONTACTOR
COIL
FIGURE 9: Typical Field Wiring (Air Handler / Electrical Heat)
ALL FIELD WIRING TO BE IN ACCORDANCE WITH ELECTRIC CODE (NEC) AND/OR LOCAL CODES
POWER WIRING
208/230-1-60
CONTACTOR
TERMINALS
COIL
GND.
LUG
C
Y
R
G
W
Y
R
G
W
POWER WIRING
CONTROL WIRING
FACTORY WIRING
24 VOLT CONTROL WIRING
MINIMUM 18 GA. WIRE
(NEC CLASS 2)
FURNACE OR AIR HANDLER TERMINAL BLOCK
ROOM THERMOSTAT
CONDENSING UNIT
ALL OUTDOOR WIRING MUST BE WEATHERPROOF. USE COPPER CONDUCTORS ONLY.
TERMINAL W IS ONLY
REQUIRED ON SYSTEMS
WITH HEAT.
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