292424-XIM-A-0307
4
Unitary Products Group
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 ductwork.
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 document 247077 “Application Data-General
Piping Recommendations for Split Systems Air Condi-
tioners and Heat Pumps”.
3.
The condensing unit should not be installed where nor-
mal 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 con-
tractor 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 sup-
ports. 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 ade-
quately supporting the entire unit weight. Refer to Figure 1
and Table 7 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
requirements.
GROUND LEVEL LOCATIONS
The units must be installed on a one-piece level concrete
slab with a minimum thickness of 4 inches (102mm). The
length and width should be at least 6 inches (153mm) greater
than the units overall base dimensions. Refer to Figure 4.
Footers under the slab that extend below the frost line are
recommended. 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
your structure.
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 3 for the center of gravity
and unit weight.
TABLE 1: UNIT APPLICATION DATA
MODEL
150, 180 & 240 Mbh
Voltage Variation
1
Min. / Max.
1.
Utilization Range “A” in ARI Standard 110.
380/415-3-50
342 /456 V
Ambient Air
2
on
Condenser Coil
Min. / Max.
2.
The minimum allowed ambient temperature for
mechanical cooling without the head pressure control
accessory installed must be raised if the indoor air flow
is less than the minimum value given in the capacity
tables.
Standard
45°F/115°F
(-7°C/46°C)
Precautions should be taken to protect the unit
from tampering and unauthorized persons from
injury. Screws on access panels will prevent
casual tampering. Additional safety precautions
such as fences around the unit or locking devices
on the panels may be advisable. Check local
authorities for safety regulations.
TABLE 2: DIMENSIONS FOR CENTER OF
GRAVITY
UNIT
DIMENSION mm.
A
B
C
D
150 Mbh
321
1086
293
807
180 Mbh
813
1953
407
1013
240 Mbh
813
1953
407
1013
FIGURE 1 - CENTER OF GRAVITY
A
B
C
D
B A C K
( C O I L E N D )
A P P R O X I M A T E
C E N T E R O F
G R A V I T Y
F R O N T
