14
FAXA-SVX01B-EN
Installation
pre-installation
considerations
Installation
Acoustic Considerations
Before determining the final unit
installation site, remember that proper
unit placement is critical in reducing
transmitting sound levels to the building.
The ideal time to make provisions to
reduce sound transmissions is during the
design phase. The most economical
means of avoiding a potential acoustical
problem is to place units in areas that are
not acoustically sensitive. Ideal locations
are over over corridors, utility rooms,
toilets, or other areas where higher
sounds levels below the unit may be
acceptable.
Follow these basic guidelines to help
minimize sound transmission through the
building structure:
• Locate the unit’s center of gravity close
to or over a column or main support
beam.
• If the roof structure is very light, replace
roof joists using a structural shape in
the critical areas described above.
Note: Cut applicable holes only for the
supply, exhaust, and return duct pen-
etration in the roof deck. To maintain
roof integrity and prevent possible
property damage, do not remove the
roof decking from the inside perimeter of
the curb.
Installation Preparation
Before installing the unit, perform the
following procedures to ensure proper
unit operation.
1. Verify the roof curb is level. To ensure
proper unit operation, install the unit
level (zero tolerance) in both horizontal
axes. Failure to level the unit properly
can result in condensate management
problems, such as standing water
inside the unit. Standing water and wet
surfaces inside units can result in
microbial growth (mold) in the drain
pan that may cause unpleasant odors
and serious health-related indoor air
quality problem.
2. Allow adequate service and code
clearances as recommended in
“Service Access” section on page 10.
3. Position the unit and skid assembly in
its final location. Test lift the unit to
determine exact unit balance and
stability before hoisting it to the
installation location. See Figure I-IP-2 on
page 41 for typical rigging procedures,
including cautions and proper uses of
such equipment as fork lifts, spreader
bars, and hooks.