Specifications

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 tolerances which must be maintained at
the compressor terminals during starting and running
conditions are indicated on the unit Rating Plate and Table 1.
The internal wiring harness furnished with this unit is an integral
part of a UL and C.G.A. 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 circuits. Wire entry
at knockout openings require conduit fittings to comply with
NEC (in U.S.A.), CEC (in Canada) and/or local codes. Refer to
Figure 7 for installation location. If any of the wire supplied with
the unit must be replaced, replacement wire must be of the type
shown on the wiring diagram. Refer to Table 3 for electrical
data.
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.
CAUTION: 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.
Refer to Figure 6 for typical field wiring and to the appropriate
unit wiring diagram for control circuit and power wiring
information.
ELECTRIC HEATERS
Electric heaters are available as field-installed accessories.
Refer to Form 530.18-N9.1V for accessory instruction. These
UL and C.G.A. approved heaters are located within the central
compartment of the unit (see Figure 7 for access panel) with
the heating elements extending into the supply air chamber. All
accessory heaters contain a single point power supply kit.
Fuses are supplied, where required, with the heater accessory.
Some KW sizes require fuses and others do not. Refer to the
accessory instruction for electrical data.
COMPRESSORS
The compressors are mounted on springs which have been
tightened down for shipment only. After the unit is installed,
back out the compressor bolts until the sleeve clears the top
grommet.
OPTIONAL ECONOMIZER / MOTORIZED
DAMPER RAIN HOOD
The following procedure should be used when assembling an
economizer rain hood onto a unit. The outdoor and return air
dampers, the damper actuator, the damper linkage, the outdoor
and return air divider baffles and all the control sensors are
factory mounted as part of the economizer option
All of the hood components, including the filters, the gasketing
and the hardware for assembling are packaged and located
within the unit filter secion. (See Figure 4).
1. With filter section access panel removed, take out the hood
components, filters, gasketing and hardware described
above. Remove and discard the outdoor air opening cover
on back of the unit.
2. Assemble the rain hood per the following procedures:
a) Apply gasketing to all hood components as follows:
-To the top outside surface and to the flange (toward
unit) of each side plate. Extend gasketing 1/4" be-
yond the top and bottom of the flange to insure
adequate sealing.
-To the edge and flanges (in one continuous length) on
each side of the center filter support.
-To the top flange of the bottom filter support (on the
side facing the unit).
-To the hood cover flange (only on unit sizes 10 tons
and over). (No gasketing required on this flange for unit
sizes under 10 tons.)
530.18-N9Y
Unitary Products Group 5