Installation and Service Manual

4
6-580.12
Location Recommendations
1. When locating the heater, consider general space and
heating requirements, availability of gas and electrical
supply, and proximity to vent locations.
2. Avoid installing units in extremely drafty locations. Drafts
can cause burner flames to impinge on heat exchangers
which shortens life. Maintain separation between units so
discharge from one unit will not be directed into the inlet
of another.
3. Be sure the structural support at the unit location site is
adequate to support the unit's weight. For proper operation
the unit must be installed in a level horizontal position.
4. Do not install units in locations where the flue products can
be drawn into the adjacent building openings such as
windows, fresh air intakes, etc.
5. Be sure that the minimum clearances to combustible
materials and recommended service clearances are
maintained. Units are designed for installation on non-
combustible surfaces with the minimum clearances shown
in Figure 4.1 and Tables 4.1 and 4.2.
6. Units exposed to inlet air temperatures of 40°F or less,
may experience condensation, therefore, provisions should
be made for disposal of condensate.
7. When locating units, it is important to consider that the
exhaust vent piping must be connected to the outside
atmosphere.
8. Maximum equivalent vent lengths are listed in "Section A -
General Instruction - All Units" of the Venting Instructions.
SI (METRIC) CONVERSION FACTORS / UNIT LOCATION
DANGER
Appliances must not be installed where they may be exposed
to a potentially explosive or flammable atmosphere.
A
D
B
C
Access
Side
Table 4.1 - Combustible Material Clearances ➀
➀ Provide sufficient room around the heater to allow for proper
combustion and operation of fan. Free area around the heater must
not be less than 1-1/2 times the discharge area of the unit.
Access Non-Access Top of Power
Model Side Side Top Bottom Exhauster
Size (A) (B) (C) (D) (Not shown)
150-175 1" 1" 4" 12" 2"
200-400 1" 1" 5" 12" 3"
Table 4.2 - Recommended Service Clearances
Access Non-Access Top of Power
Model Side Side Top Bottom Exhauster
Size (A) (B) (C) (D) (Not shown)
150-175 18" 18" 6" 22" 2"
200-400 18" 18" 6" 25" 3"
UNIT LOCATION
CAUTION
1. Clearances to combustible materials are critical. Be sure
to follow all listed requirements.
2. Heaters are designed for use in heating applications with
ambient startup temperatures between -40°F and 90°F and
ambient operating temperatures between 40°F and 90°F.
3. Do not install unit outdoors.
4. In garages or other sections of aircraft hangars such
as offices and shops that communicate with areas used for
servicing or storage, keep the bottom of the unit at least
7' above the floor unless the unit is properly guarded.
In parking garages, the unit must be installed in accordance
with the standard for parking structures ANSI/NFPA 88A -
latest edition, and in repair garages the standard for repair
garages NFPA 30A - latest edition (formerly NFPA 88B).
In Canada, installation of heaters in airplane hangars must
be in accordance with the requirements of the enforcing
authority, and in public garages in accordance with the
current CSA-B149 codes.
5. In aircraft hangars, keep the bottom of the unit at least
10' from the highest surface of the wings or engine
enclosure of the highest aircraft housed in the hangars
and in accordance with the requirements of the enforcing
authority and/or NFPA 409 – latest edition.
6. Installation of units in high humidity or salt water
atmospheres will cause accelerated corrosion resulting in
a reduction of the normal life of the units.
IMPORTANT
To prevent premature heat exchanger failure, do not locate
ANY gas-fired appliances in areas where corrosive vapors (i.e.
chlorinated, halogenated or acidic) are present in the atmosphere.
9. Do not install units in locations where gas ignition system
is exposed to water spray, rain, or dripping water.
10. Do not install units below 7', measured from the bottom
of the unit to the floor, unless properly guarded to provide
protection from moving parts.
Figure 4.1 - Combustible Material and Service Clearances
Combustion Air Requirements
The National Fuel Gas Code defines an “unconfined space” as
a space whose volume is greater than 50 cubic feet per 1,000
Btu/Hr input of the installed appliance(s). A confined space is
50 cubic feet or less per 1,000 Btu/Hr input of the installed
appliance(s).
Units installed in tightly sealed buildings or confined spaces
must be provided with two permanent openings, one near the
top of the confined space and one near the bottom. Each
opening should have a free area of not less than one square
inch per 1,000 BTU per hour of the total input rating off all units
in the enclosure, freely communicating with interior areas
having, in turn adequate infiltration from the outside.
For further details on supplying combustion air to a confined
(tightly sealed) space or unconfined space, see the National
Fuel Gas Code ANSI Z223.1 (NFPA 54) or CSA-B149.1
Installation Code - latest edition.
Sound and Vibration Levels
All standard mechanical equipment generates some sound and
vibration that may require attenuation. Libraries, private offices
and hospital facilities will require more attenuation, and in such
cases, an acoustical consultant may be retained to assist in the
application. Locating the equipment away from the critical area
is desirable within ducting limitations. Generally, a unit should
be located within 15' of a primary support beam. Smaller
deflections typically result in reduced vibration and noise
transmission.