Trane GGAA, Installation, Operation And Maintenance Manual

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MUA-SVX005B-EN 11
Installation
Location
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Before placing the Make-Up Air unit in its permanent location, make certain that the structure is
capable of carrying the additional load of this equipment. Check the unit weight given at the end
of this manual.
Refer to Installation and Clearances section for required clearances to combustible material, and
Figure 5, p. 14 for manufacturer’s recommendations.
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IIm mp po orrtta an ntt:: When selecting a location for these Make-Up Air Units, both the size of the unit and
the heating requirements of the building must be considered.
If a variable frequency drive (VFD) has been ordered with the unit, consideration should be made
for the VFD operating temperature range: 14°F to 130°F. For temperatures below 14°F, VFD must
be factory-installed within the VFD Enclosure accessory (Model Digit 22, option 9), or field-
mounted indoors.
Combustion Air Considerations
The presence of chlorine vapors or other corrosive vapors in the combustion air supply for gas-
fired heating equipment presents a potential corrosive hazard. Chlorine will, when exposed to
flame, precipitate from the compound (usually freon or degreaser vapors) and go into solution
with any condensation that is present in the heat exchanger or associated parts. The result is
hydrochloric acid which will readily attack all metals, including 300 grade stainless steel. Care
should be taken to separate these vapors from the combustion process.
Mounting Height
1. When a Gas Fired Make-Up Air Handler is discharging directly into the heated space, a
mounting height of eight feet (2.4m) above the floor is recommended. Less efficient air
distribution results at higher levels.
2. When Gas Fired Indoor Make-Up Air Handlers are installed in airplane hangars, NFPA
specifies that the units must be at least ten feet (3.0m) above the upper surface of wings or
engine enclosures of the highest aircraft to be stored in the hangar. This measurement
should be made from the wing or engine enclosure (whichever is higher from the floor) to the
bottom of the heater. Heaters must be installed at least eight feet (2.4m) above the floor in
shops, offices, and other sections of the hangar where aircraft are not stored or housed. Refer
to NFPA 409 Aircraft Hangars.
3. In parking structures, Gas Fired Indoor Make-Up Air Handlers must be installed so that the
burner flames are located 18 in. (45mm) above the floor or protected by a partition not less
than 18 in. (457mm) high as specified in NFPA 88A Parking Structures.
4. In public repair garages, Gas Fired Make-Up Air Handlers must be installed in a detached
building or room separated from repair areas as specified in NFPA 88B Repair Garages.