362242-YIM-B-0109
10 Johnson Controls Unitary Products
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 the manufac-
turer's instructions enclosed with the thermostat for
general installation procedure. A minimum of seven
color-coded insulated wires (#18 AWG) should be used
to connect the thermostat to the unit.
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 elec-
trically grounded in accordance with NEC and CEC (as
specified above) and/or local codes. Voltage tolerances,
which must be maintained at the compressor terminals,
during starting and running conditions, are indicated on
the unit Rating Plate and the Unit Application Data table.
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-
ada) and/or local codes. If any of the wire supplied 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.
Use copper conductors properly sized to carry the load.
Each unit must be wired with a separate branch circuit
fed directly from the meter panel and properly fused.
Refer to the Typical Field Wiring Figure 3 and to the
appropriate unit wiring diagram for control circuit and
power wiring information.
OPTIONS/ACCESSORIES
ELECTRIC HEAT
The factory- or field-installed heaters are wired for sin-
gle point power supply. Power supply need only be
brought into the single point terminal block and thermo-
stat wiring to the low voltage terminal strip located in
the upper portion 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 7 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 6
208/230-3-60 and 380/415-3-50 units control tran-
formers 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.
When connecting electrical power and control wir-
ing 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.
TABLE 2: CONTROL WIRE SIZES
Wire Size
Maximum Length
1
1. From the unit to the thermostat and back to the unit.
18 AWG 150 Feet
TABLE 3: ELECTRIC HEATER CFM LIMITATIONS
UNIT MODEL SIZE
NOMINAL TONS
VOLTAGE
MINIMUM SUPPLY AIR CFM
HEATER SIZE NOMINAL KW
5 7 10 15 20 30
036
(3)
208/230-1-60 900 900 900 900 900 -
208/230-3-60 900 900 900 900 900 -
460-3-60 - 900 900 900 900 -
600-3-60 - - 900 900 900 -
048
(4)
208/230-1-60 1200 1200 1200 1200 1200 -
208/230-3-60 1200 1200 1200 1200 1200 -
460-3-60 - 1200 1200 1200 1200 -
600-3-60 - - 1200 1200 1200 -
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