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THERMOSTAT
The room thermostat should be located on an inside wall
approximately 56 inches above the floor where it will not
be subject to drafts, sun exposure or heat from electrical
fixtures or appliances. Follow manufacturer's instructions
enclosed with thermostat for general installation proce-
dure. A minimum of seven color-coded insulated wires
(#18 AWG) should be used to connect thermostat to unit.
SPACE SENSOR
The space sensor, if used, should be located on an
inside wall approximately 56 inches above the floor
where it will not be subject to drafts, sun exposure or
heat from electrical fixtures or appliances. Follow man-
ufacturer's instructions enclosed with sensor for gen-
eral installation procedure.
POWER AND CONTROL WIRING
Field wiring to the unit must conform to provisions of
the National Electrical Code, ANSI / NFPA No. 70 (in
U.S.A.), current Canadian Electrical Code C22.1 (in
Canada) and/or local ordinances. The unit must be
electrically grounded in accordance with NEC and CEC
(as specified above) and/or local codes. Voltage toler-
ances, which must be maintained at the compressor
terminals, during starting and running conditions, are
indicated on the unit Rating Plate and the Unit Applica-
tion Data table.
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.
The internal wiring harness furnished with this unit is
an integral part of a CSA design certified unit. Field
alteration to comply with electrical codes should not be
required.
A fused disconnect switch should be field provided for
the unit. The switch must be separate from all other cir-
cuits. Wire entry at knockout openings require conduit
fittings to comply with NEC (in U.S.A.), CEC (in Can-
Johnson Controls Unitary Products
ada) and/or local codes. Refer to the Dimensions
Figure 13 for installation location. If any of the wire sup-
plied with the unit must be replaced, replacement wire
must be of the type shown on the wiring diagram and
the same minimum gauge as the replaced wire.
Electrical line must be sized properly to carry the load.
Use copper conductors only. Each unit must be wired
with a separate branch circuit fed directly from the
meter panel and properly fused.
When connecting electrical power and control
wiring to the unit, waterproof type connectors
MUST BE USED so that water or moisture
cannot be drawn into the unit during normal
operation. The above waterproofing conditions
will also apply when installing a field-supplied
disconnect switch.
Refer to the Typical Field Wiring Figure 5 and to the
appropriate unit wiring diagram for control circuit and
power wiring information.
TABLE 2: CONTROL WIRE SIZES
Wire Size
18 AWG
1.
From the unit to the thermostat and back to the unit.
OPTIONAL ELECTRIC HEAT
The factory-installed heaters are wired for single point
power supply. Power supply need only be brought into
the single point terminal block and thermostat wiring to
the low voltage terminal strip located in the upper por-
tion of the unit control box.
These CSA approved heaters are located within the
central compartment of the unit with the heater ele-
ments extending into the supply air chamber. Refer to
Figure 13 for access panel location.
Fuses are supplied, where required, by the factory.
Some KW sizes require fuses and others do not. Refer
to Table 3 for minimum CFM limitations and to Tables 9
thru 14 for electrical data.
284812-YIM-D-1008
1
Maximum Length
150 Feet
13
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