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These instructions cover installation, operation, and mainte-
nance of all single package WCH air conditioning units. For an
easy and orderly installation, follow the sequence of instructions
as they are outlined. Improper installation can result in unsat-
isfactory operation and/or dangerous conditions as well as make
the related warranty inapplicable. Read this manual carefully
before installing, operating, or performing maintenance on this
unit. Installation and maintenance should be performed by
qualified service technicians. Locate the unit in accordance with
local codes or the National Electrical Code. Each unit contained
an operating charge of HCFC-22 when shipped.
Unit Inspection
The material in this shipment has been inspected at the factory
and was released to the transportation agency without known
damage. Inspect the exterior of the carton for evidence of rough
handling in shipment. Check the unit nameplate to determine if
the unit is correct for the intended application. After moving the
equipment to the approximate location, unpack it carefully. If
damage to the unit is found, report the nature of this damage
immediately to the delivery agency. Check to be sure that the
refrigerant charge has been retained during shipment.
This unit was designed for multiple applications: rooftop, out-
door ground level. For proper installation, the following recom-
mendations must be considered:
•Installation of the unit should conform to local building codes
or, in the absence of local codes, to the National Electrical Code.
Canadian installations must conform to CSA and local codes.
•Select a location that will permit unobstructed airflow into the
outdoor coil and away from the fan discharge. The discharge air
from the outdoor fan must be unrestricted for a minimum of
three (3) feet above the unit. Any reduction of the unit clearances
recommended may result in condenser coil starvation or the
recirculation of warm condenser air. Actual clearances which
are inadequate should be reviewed with a local sales represen-
tative. If the unit is located under an overhang, provisions must
be made to deflect the warm discharge air from under the
overhang. See Figures 1, 2, and 5. The unit must also be situated
to permit easy and unrestricted access for service.
•Install internal accessories to the unit at the shop if practical.
•Position the unit so roof-run-off water does not pour directly
onto the unit.
•CAUTION MUST ALWAYS BE TAKEN TO AVOID PER-
SONAL INJURIES AND/OR DAMAGE TO THE EQUIPMENT.
•In locations with deep snows raise the unit a minimum of 12
inches off the deck, slab, or pad. This will reduce the chance of
the coil being blocked snow. The water that occurs during the
defrost cycle has a better chance of flowing from the vicinity of
the unit.
•Avoid locating the unit where snow drifts. This will reduce the
times when it is necessary to remove snow from around the unit.
Snow accumulations should be removed from the sides of the
unit for best efficiency.
•Consider installing a snow drift barrier around the unit. This
will prevent a build up of snow on the sides of the unit. The
barrier should be of sufficient distance from the unit to prevent
Page 2
General Information
Locations and Recommendations
Power Supply
The power supply must be adequate for the unit and any
supplementary electric heaters, if added. Make certain that the
power supply to the unit agrees with the power requirements
specified on the unit nameplate. Separate branch circuits are
required for supplementary electric heaters.
Rigging
IMPORTANT: Check the handling facilities to ensure the safety
of both personnel and the unit. Be sure that the proper method
of rigging is used, with straps or slings and spreader bars for
protection during lifting.
▲
!
Safety Warning. Do not lift the unit without testing for
balance and rigging. Do not lift the unit in windy condi-
tions or above personnel. Do not lift the unit by attaching
a clevis, hooks, pins, or bolts to the unit casing, casing
hardware, corner lugs, angles, tabs, or flanges. Failure to
observe this warning may result in equipment damage.
restriction of airflow to and from the unit.
•Locate the unit so that the water vapor discharges upward
during the defrost cycle and does not condense on windows and
fog them or cause icicles to form on the roof overhangs.
•Elevation minimums must be observed for drain line "trap" and
ventilation to the under side of the unit.
•All duct work inside the structure should be adequately insu-
lated.
•All duct work outside of the structure must be insulated and
weatherproofed in accordance with local codes. If supplemen-
tary heat is added, the duct connectors should be of a flame
retardant material.
•Access and service clearances for the unit must be given careful
consideration when locating the duct entrance openings. Figure
1 provides unit dimensions.
•All fabricated outdoor ducts should be as short as possible.
•Be sure the hole(s) in the structure is large enough to accommo-
date the ducts and the insulation surrounding them. See Figure
1.
•For outdoor, ground level applications the unit must be mounted
on a solid, level foundation that is not adjoined to the structure
because sound and vibration may otherwise be transmitted to
the structure.
•Field supplied mounting pads should be used beneath the unit
to prevent transmission of vibration to the occupied structure.
•Select a location that will minimize the length of the supply and
return ducts.
•Select a location where external water drainage cannot collect
around the unit.
•Give consideration to shade, appearance, and noise.
WARNING
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