Sterling QVSB - Manual (Page 6)

6
INSTALLATION
(continued)
Figure 4 - Heat Throw Distances
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 fl oor surface.
Additional unit heaters should be installed if a minimum
50°F (10°C) thermostat setting cannot be maintained.
NOTICE: Unit heater sizing should be based on heat
loss calculations where the unit heater output equals
or exceeds heat loss. Heater output is approximately
80% of input BTU/HR. rating.
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 (457mm). A minimum
clearance of 6 inches (152mm) must be maintained
between the top of the Unit Heater and the ceiling. The
bottom of the Unit Heater must be no less than 24 inches
(610mm) from any combustible. The distance between
the fl ue collector and any combustible must be no less
than 6 inches (152mm). Also see COMBUSTION AIR
and EXHAUST VENTING sections.
NOTICE: Increasing the clearance distances may be
necessary if there is a possibility of distortion or
discoloration of adjacent materials.
Make certain that the lifting
methods used to lift the heater and the method
of suspension used in the fi eld installation of the
heater are capable of uniformly supporting the
weight of the heater at all times. Failure to heed
this warning may result in property damage or
personal injury!
Make certain that the structure to
which the heater is 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.
Unit heaters must be hung level
from side to side and from front to back, see
fi gures 1 through 6. 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 job. Failure to do so may result
in extensive property damage, severe personal
injury or death.
personal injury or death!
Refer to Figures 1 through 6, and dimensional data
per table 1 for suspension of units.
Figure 5 - Heater Mounting*
*All hanging hardware and wood is not included with the unit
(To be fi eld supplied).
Figure 6 - Heater Mounting 100/400 MBTU Unit Sizes
See Table 1 for “C” dimension.