Unit Location; Combustible Material And Service Clearances; Location Recommendations - Modine Manufacturing PTC Installation And Service Manual

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unIT loCATIon
DANGER
Appliances must not be installed where they may be
exposed to a potentially explosive or flammable atmosphere.
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 temperatures between 40°F and 80°F. Heaters
should not be used in applications where the heated space
temperature is below 40°F. The combination of low space
and combustion air temperatures may result in condensate
freezing in the secondary heat exchanger and/or
condensate drain.
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 to
provide user protection from moving parts and interior
surface temperatures that can cause serious burns if
touched. In parking garages, the unit must be installed in
accordance with the standard for parking structures ANSI/
NFPA 88A, and in repair garages the standard for repair
garages NFPA 30A (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.

location recommendations

1. When locating the heater, consider general space and
heating requirements, availability of gas and electrical supply,
and proximity to vent locations and condensate drain lines.
2. When locating units, it is important to consider that the
combustion air and exhaust vent piping must be connected
to the outside atmosphere. Vent terminals should be located
adjacent to one another. Maximum equivalent vent lengths
are listed in "Section A - General Instruction - All Units" of the
Venting instructions.
3. Be sure the structural support at the unit location site is
adequate to support the unit's weight. Refer to pages 26 and
27 for unit weights. For proper operation the unit must be
installed in a level horizontal position.
4
figure 4.1 - Combustible material and service
Clearances
Table 4.1 - Clearances - sizes 110 and Below
unit side
Combustible materials
Top and Bottom
Access side
non-Access side
rear
vent Connector
Table 4.2 - Clearances - sizes 135-310
unit side
Combustible materials
Top and Bottom
Access side
non-Access side
rear
vent Connector
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 with the
minimum clearances as shown in Figure 4.1 and Table 4.1.
Clearance from the top of the unit may be required to be
greater than 6" if heat damage other than fire could result
(such as material distortion or discoloration).
6. Do not install units in locations exposed to water spray, rain,
or dripping water.
7. Mounting height (measured from bottom of unit) at which unit
heaters are installed is critical. Refer to mounting height and
heat throw data on page 24 of this manual. The maximum
mounting height for any unit is that height above which the
unit will not deliver heated air to the floor.
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.
6-563.7
Clearance To recommended
service Clearance
1"
1"
1"
18"
6"
Clearance To recommended
service Clearance
6"
6"
6"
18"
6"
1"
18"
18"
18"
6"
6"
18"
18"
18"
6"