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When positioning heaters, keep in mind the
clearances to combustible materials, lights, sprinkler
heads, overhead doors, storage areas with stacked
materials, gas and electrical lines, parked vehicles,
cranes and any other possible obstructions or
hazards. Refer to the Warnings, Cautions and the
Clearance-To-Combustibles Chart in the Safety
Information Section and on the heater to verify that a
safe installation condition exists.
The following guidelines must also be met to ensure
a good installation and proper heater performance:
* A maximum of two 45 degree elbows, two 90 degree
elbows or one 180 degree elbow can be installed on
heaters. The gas input of the heaters, as stated on
the rating label, will determine the minimum length
of radiant pipe from the control box to the first elbow.
(See Optional 45, 90 and 180 degree Elbows section
on page 14.)
NOTE: Flue vent requirements do not change when
elbows are installed.
* Do not exceed the maximum vent length of 20 ft./6.1m
for exhausting the heater. Consult Flue Venting,
Section 2.8.
* Do not combine the exhaust vents of two heaters
into a straight-through tee. A Part Number DB-3YA,
or staggered-tee arrangement must be used. Heaters
sharing the same vent must share the
same thermostat. Common vents must have 4 in./
10.2cm Diameter ( see Figure 2.1.1).
* Outside air for combustion must be ducted to the
heater if the building atmosphere where the heater
is installed contains one of the following:
- Chemicals such as chlorinated or fluorinated
hydrocarbons.
- High humidity such as car washes.
- Contaminants such as sawdust, welding
smoke, etc.
- Negative static pressure.
Consult Combustion Air Requirements section on
page 20.
* Do not exceed the maximum air intake duct length of
35 ft./10.7m. Consult Air Intake Duct Chart on page 20.
* Do not draw fresh air to the heater from an attic
space. There is no guarantee that adequate air will
be supplied. Prevailing winds can create negative
or positive pressure in the space.
* All unvented heaters must use a vent with flapper,
Part Number DB-3VCF.
Once all of the safety precautions and design criteria
are met, the actual installation of the heater may begin.
6
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