LIMITATIONS
These units must be installed in accordance with all national
and local safety codes. If no local codes apply, installation must
conform with the appropriate national codes. See Table 1 for
Unit Application Data. Units are designed to meet National
Safety Code Standards. If components are to be added to a
unit to meet local codes, they are to be installed at the dealer’s
and/or the customer’s expense.
LOCATION
Use the following guidelines to select a suitable location for
these units.
1. The condensing unit is designed for outdoor installation
only. The condenser fans are the propeller type and are not
suitable for use with duct work.
2. The condensing unit and the evaporator blower should be
installed as close together as possible and with a minimum
number of bends in the refrigerant piping. Refer to
“REFRIGERANT PIPING” for additional information.
3. The condensing unit should not be installed where normal
operating sounds may be objectionable. On either rooftop
or ground level installations, rubber padding can be applied
between the base rails and their supports to lessen any
transmission of vibration.
ROOF-TOP LOCATIONS
Be careful not to damage the roof. Consult the building contrac-
tor or architect if the roof is bonded. Choose a location with
adequate structural strength to support the unit.
The condensing unit must be mounted on solid level supports.
The supports can be channel iron beams or wooden beams
treated to reduce deterioration.
A minimum of two (2) beams are required to support each unit.
The beams should: (1) Be positioned perpendicular to the roof
joists. (2) Extend beyond the dimensions of the unit to distribute
the load on the roof. (3) Be capable of adequately supporting
the entire unit weight. Refer to Figure 1 and Table 2 for load
distribution and weights.
These beams can usually be set directly on the roof. Flashing
is not required.
NOTE: On bonded roofs, check for special installation require-
ments.
GROUND LEVEL LOCATIONS
The units must be installed on a one-piece level concrete slab
with a minimum thickness of 4 inches. The length and width
should be at least 6 inches greater than the units overall base
dimensions. Refer to Figure 4.
Footers under the slab that extend below the frost line are recom-
mended. Any strain on the refrigerant lines may cause a refrigerant
leak. The slab should not be tied to the building foundation because
noise and vibration will telegraph into the building.
A unit can also be supported by concrete piers. These piers
should (1) extend below the frost line, (2) be located under the
unit’s four corners, and (3) be sized to carry the entire unit
weight. Refer to Figure 1 and Table 2 for the center of gravity
and unit weight.
CAUTION: Care should be taken to protect the unit from
tampering and unauthorized persons from injury.
Screws on access panels will prevent casual tam-
pering. Additional safety precautions such as
fences around the unit or locking devices on the
panels may be advisable. Check local authorities
for safety regulations.
RIGGING AND HANDLING
Exercise care when moving the unit. Do not remove any pack-
aging until the unit is near the place of installation.
Rig the unit by attaching chain or cable slings with hooks to the
round lifting holes provided in the base rails.
CAUTION: Spreaders, longer than the largest dimension
across the unit, MUST be used across the top of
the unit.
WARNING: BEFORE LIFTING A UNIT, MAKE SURE THAT ITS
WEIGHT IS DISTRIBUTED EQUALLY ON THE
CABLES SO THAT IT WILL LIFT EVENLY.
Units may also be moved or lifted with a fork-lift from the front,
rear or the compressor end only through the slotted openings
provided in the base rails.
CAUTION: LENGTH OF FORKS MUST BE A MINIMUM OF
54" (when lifting from the compressor end of the
unit) and a MINIMUM OF 42" (when lifting from the
front or rear of the unit).
Remove the nesting brackets from the four corners on top of
the unit. All screws that are removed to take these brackets off
must be replaced on the unit.
INSTALLATION
MODEL
180 & 240 MBH
Voltage Variation
1
Min. / Max.
208/230-3-60
187 / 252
460-3-60
432 / 504
575-3-60
540 / 630
Ambient Air on
Condenser Coil
Min. / Max.
Standard
35
°
F / 115
°
F
with Head Pressure
Control
0
°
F / 115
°
F
1. Utilization Range "A" in ARI Standard 110.
2. The minimum allowed ambient temperature for mechanical cooling without the head pres-
sure control accessory installed must be raised if the indoor air flow is less than the mini-
mum value given in the capacity tables.
TABLE 1 - UNIT APPLICATION DATA
FIG. 1 - CENTER OF GRAVITY
Unit
Dim. (in.)
A
B
180 Mbh
16
32
240Mbh
16
32
550.23-N6Y
Unitary Products Group
3
