Mestek IIEB-11, Installation & Parts Manual

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Make certain that the lifting
methods used to lift the unit heater and the
structure to which the heater is to be mounted
is capable of safely supporting its weight. Under
no circumstances must the gas lines, venting
system or the electrical conduit be used to
support the heater or should any other objects
(ie. ladder/person) lean against the heater, gas
lines or electrical conduit for support. Failure
to heed these warnings may result in property
damage, personal injury or death.
Unit heaters must be hung level from
side to side and from front to back; see Figures
2, 4 and 5. Failure to do so will result in poor
performance and or premature failure of the unit.
Insure that all hardware used in
the suspension of each unit heater is more than
adequate for the installation. Failure to do so
may result in extensive property damage, severe
personal injury or death!
Refer to Figures 4 and 5, and dimensional data per
Table 1 and Figure 2 for suspension of units.
Figure 4 - Heater Mounting*
*All hanging hardware and wood is not included with the unit
(To be fi eld supplied).
Figure 5 - Heater Mounting 100/400 MBTU Sizes
Unit Sizes
6
INSTALLATION
(continued)
The installation is to be adjusted to obtain an air
throughput within the range specifi ed on the rating plate.
Unit heaters should not be installed to maintain low
temperatures and/or freeze protection of buildings.
A minimum of 50°F (10°C) thermostat setting must
be maintained. If unit heaters are operated to maintain
lower than 50°F (10°C), hot fl ue gases are cooled inside
the heat exchanger to a point where water vapor (a fl ue
gas by-product) condenses onto the heat exchanger
walls. The result is a mildly corrosive acid that
prematurely corrodes the aluminized heat exchanger
and can actually drip water down from the unit heater
onto floor surface. Additional unit heaters should be
installed if a minimum 50°F (10°C) thermostat setting
cannot be maintained.
AIR FOR COMBUSTION: The Unit Heater shall be
installed in a location in which the facilities for
ventilation permit satisfactory combustion of gas,
proper venting, and the maintenance of ambient
temperature at safe limits under normal conditions
of use. The Unit Heater shall be located in such a
manner as not to interfere with proper circulation of air
within the confi ned space. When buildings are so tight
that normal infi ltration does not meet air requirements,
outside air shall be introduced per Sections 1.3.4.2 and
1.3.4.3 of ANSI Z223.1 for combustion requirements. A
permanent opening or openings having a total free area
of not less than one square inch per 5,000 BTU/HR.
(1.5 Kw) of total input rating of all appliances within the
space shall be provided.
NOTICE: Unit heater sizing should be based on heat
loss calculations where the unit heater output equals
or exceeds heat loss.
CLEARANCES: Each Gas Unit Heater shall be located
with respect to building construction and other equipment
so as to permit access to the Unit Heater. Clearance
between walls and the vertical sides of the Unit Heater
shall be no less than 18 inches (457 mm). A minimum
clearance of 6 inches (152 mm) must be maintained
between the top of the Unit Heater and the ceiling. The
bottom of the Unit Heater must be no less than 12 inches
(305 mm) from any combustible. However, in order to
ensure access to the burner compartment, a minimum
distance of 21 inches (533 mm) is required. The distance
between the flue collector and any combustible must
be no less than 6 inches (152 mm). Also see AIR FOR
COMBUSTION and VENTING sections.
NOTICE: Increasing the clearance distances may
be necessary if there is a possibility of distortion or
discoloration of adjacent materials.