035-15806-004 Rev. A (1000)
Unitary Products Group
7
LOW VOLTAGE
Control wiring may vary, depending upon the type of thermo-
stat, furnace or air handler being connected.
Low voltage wiring diagrams can be found with the furnace or
air conditioning blower package installation instructions.
Pig-tail connector wires are provided from the low voltage
pull-in coil on the contractor to a section of the control box. A
“fingered" bushing is provided in the low voltage knockout
hole. If 1/2" conduit is used for the low voltage wiring, the
bushing is to be removed.
1.
Route the low voltage cable through the fingered bush-
ing in the low voltage junction box. See Figure 3 or 4.
2.
Using wire nuts, connect the low voltage wiring as shown
in Figure 5, 6 or 7.
3.
A minimum of 18 AWG wire gauge for total lengths not
exceeding 130 feet must be used in connecting the low
voltage control wiring between the outdoor unit, furnace
and thermostat. For longer low voltage control wiring
lengths, consult the N.E.C.
Connect thermostat and control package wiring as shown in
Figure 5-7 and per the instructions packed with those pieces.
FIGURE 3 :
OUTDOOR UNIT CONTROL BOX (036, 048 & 060 MODELS)
CONTACTOR
FAN CAPACITOR
GROUND LUG
REVERSIBLE HIGH VOLTAGE
CONDUIT PLATE
LOW VOLTAGE
BOX
“FINGERED”
BUSHING
FAN MOTOR
PLUG
FIGURE 4 :
OUTDOOR UNIT CONTROL BOX (076 & 090 MODELS)
CONTACTOR 1
FAN CAPACITOR
GROUND LUG
ADJUSTABLE HIGH VOLTAGE
CONDUIT PLATE
LOW VOLTAGE
BOX
“FINGERED”
BUSHING
FAN MOTOR
PLUG
POWER WIRING
CONNECTIONS
CONTACTOR 2
(090 ONLY)
TRANSFORMER
