5
LOCATION OF EQUIPMENT - OUTDOOR
• The mounting platform or base should be level and located
so as to permit free access of supply air.
• Units must not be located in the vicinity of steam, hot air or
fume exhausts.
• The unit should be mounted away from noise sensitive
spaces such as offices.
• The unit must have adequate support to avoid vibration and
noise transmission into the building. Sound and structural
consultants should be retained for recommendations.
Ground Mounting
The unit must be set on a flat and level foundation. A single
piece concrete slab with footings extending below the frost
line and raised approximately six inches above ground level
provides a suitable base. Raising the base above ground
level provides some protection from ground water and wind
blown matter. The concrete slab should be isolated from the
building structure. Finally, before tightening mounting bolts,
recheck the level of the unit.
Roof Mounting
Rooftop installations require adequate structural beams to
support the weight of the unit and service personnel. The
design of the beams/supports must minimize deflection and
attendant vibration transmission.
Due to the weights involved, a structural analysis by a
qualified engineer may be required before mounting. Also,
for sound sensitive applications, unit vibration isolators
should be used.
UNIT VIBRATION ISOLATION
Under certain critical conditions, it is recommended that
vibration isolators, of a suitable type, be installed under the
base. The isolators must be designed for the operating
weight of the unit. Rubber-in-shear or spring type isolators
(by others) are available for this purpose.
COMPRESSOR SPRING VIBRATION
ISOLATORS
On units with this option, the compressors are secured rigidly
to make sure there is no transit damage. Before operating
the unit, it is necessary to follow these steps:
1. Remove the upper nuts and washers.
2. Discard the shipping spacers.
3. Install the neoprene spacers. (Spacers located in
the electrical panel or tied to compressor.)
4. Replace the upper mounting nuts and washers.
5. Allow 1/16 inch space between the mounting
nut/washer and the neoprene spacer.
Figure 3. Spring Mount
