Sterling QVSF - Manual (Page 6)

6
INSTALLATION
(continued)
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 12 inches
(305 mm) from any combustible. However, in order to
ensure access to the burner compartment, a minimum
distance of 25 inches (635mm) is required. 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;
nor 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
Figures 1A through 3B. Failure to do so will
result in poor performance and or premature
failure of the unit.
Ensure 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 fi gures 1 through 4, and dimensional data
per table 1 for suspension of units.
Figure 3A - Heater Mounting*
*All hanging hardware and wood is not included with the unit
(To be fi eld supplied).
Figure 3B - Heater Mounting 100/400 MBTU Unit Sizes