Sterling ME - Manual (Page 5)

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3. In parking structures, Gas Fired Indoor Make-Up Air
Handlers must be installed so that the burner fl ames
are located 18 in. (45mm) above the fl oor or protected
by a partition not less than 18 in. (457mm) high as
specifi ed 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 specifi ed in
NFPA 88B Repair Garages.
SUSPENSION
The unit should never be lifted by
the fan housing, motor mounting, grille or fl ue
connection. These are not designed to support
the total weight and may break, causing personal
injury or unit damage.
Units can be set on supports or suspended by rod
hangers from the sub-frame (and lifting brackets).
Any unit that has a side base rail
longer than 104" (2.6m) requires additional field
furnished supports by a qualifi ed installer. Refer
to all dimensional data and center of gravity
information in this manual. If further information
is required, contact the manufacturer’s technical
service department.
The unit must be hung level from side to side and front to
back, using the four (
9 /
16
" diameter) hanging holes (see Figure
3) in the skid rail, and 3 /
8
" or 1 /
2
" threaded rod or pipe.
Make certain that the structure to
which the heater is to be mounted is capable of
supporting its weight. Under no circumstances
must the gas lines, the venting system or the
electrical conduit be used to support the heater;
or should any other objects (i.e. ladder, person)
lean against the heater, gas lines, venting system
or the electrical conduit for support.
Figure 3
III. INSTALLATION
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.
Refer to Table for required clearances to combustible
material, and Figure 5 for manufacturer’s recommendations.
Do not place unit in a location
where service personnel can not safely service this
equipment or personal injury could result.
NOTICE: 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.
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 fl ame, 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 fl oor
is recommended. Less effi cient air distribution results
at higher levels.
2. When Gas Fired Indoor Make-Up Air Handlers are
installed in airplane hangars, NFPA specifi es 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 fl oor) to the bottom of
the heater. Heaters must be installed at least eight
feet (2.4m) above the fl oor in shops, offi ces, and other
sections of the hangar where aircraft are not stored
or housed. Refer to NFPA 409 Aircraft Hangars.
D8769