MUA-SVX006B-EN
9
Location
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.
NNoottee:: Refer to unit data plate for required clearances to combustible material, and Figure 15, p.
22 in the “Installation” chapter for manufacturer’s recommendations.
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IImmppoorrttaanntt::
• 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.
• The furnace section(s) of this unit is equipped for bottom access serviceability
only! Provide adequate clearance (base rail to floor is 18 inches minimum).
• 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-fi
red 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.
Locations to Avoid
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Unit heaters should not be installed within corrosive or flammable atmospheres. Do not locate
any gas fired heater where air for combustion contains chlorinated vapors or acid fumes.
IImmppoorrttaanntt:: The venting system must be installed in accordance with heater manufacturer’s
instructions. The venting system is an integral part of the unit and must not be
altered in the field!
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
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