Sterling TD - Manual (Page 5)

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8. Each slip joint must be secured with at least three
corrosion resistant screws. Two full turns of 3M
#425 Aluminum Foil Tape or its equivalent must
then be used to seal each joint. General Electric
RTV-108, Dow-Corning RTV-732 or an equivalent
may be used instead of tape.
9. For horizontal combustion air systems longer than
5 feet (1.5m), the system must be supported from
overheard building structures at 4 feet (1.22m)
maximum intervals in the United States and at
3 feet (1m) maximum intervals in Canada.
EXHAUST VENTING
Never operate separated combustion
duct furnaces without combustion air and fl ue gas
piping in place or severe personal injury or death
may occur!
CARBON MONOXIDE!
Your venting system must not be blocked by any
snow, snow drifts, or any foreign matter. Inspect
your venting system to ensure adequate ventilation
exists at all times! Failure to heed these warnings
could result in Carbon Monoxide Poisoning (symp-
toms include grogginess, lethargy, inappropriate
tiredness, or fl u-like symptoms).
1. In the United States, vent system installation
must be in accordance with the latest edition of
ANSI Z223.1 (NFPA 54) National Fuel Gas Code.
In Canada, installation must be in accordance
with CSA-B149.1 “Installation Code for Natural
Gas Burning Appliances and Equipment” and
CSA-B149.2 “Installation Code for Propane
Burning Appliances and Equipment.”
2. A Breidert Type L or Fields Starkap, furnished by
the customer, must be installed at the termination
point of the vent system. See Figures 3a and 3b.
3. Each duct furnace MUST have its own vent system.
It MUST NOT be connected to other vent systems
or to a chimney.
4. Use UL 1738 listed single wall pipe for the vent
system. For installations in Canada, use UL S636
listed vent pipe conforming with local building
codes, or in the absence of local building codes,
with current CSA-B149.1 “Installation Codes for
Natural Gas Burning Appliances and Equipment”
or CSA-B149.2, “Installation Codes for Propane
Gas Burning Appliances and Equipment.”
Never use pipe of a diameter other
than that specifi ed in these instructions! Never use
PVC, ABS, or any other non-metallic pipe for exhaust
venting! To do so may result in serious damage to
the unit and/or severe personal injury or death!
5. Any run of single wall vent pipe passing through
an unheated space must be insulated with an
insulation suitable to 550°F (288°C).
6. The vent system must be installed to prevent
collection of condensate. Pitch horizontal pipes
downward 1/4" per foot (21mm/m) towards the
vent cap to facilitate drainage. Vertical vent pipes
should be piped as depicted in Figure 3a.
7. The equivalent length of the vent system must not
be less than 5 feet (1.5m) and must not exceed
50 feet (15.2m). Equivalent length equals the total
length of straight pipe plus 10 feet (3.05m) for each
90° elbow and 4 feet (1.22m) for each 45° elbow.
8. For horizontal combustion air systems longer than
5 feet (1.5m), the system must be supported from
overheard building structures at 4 feet (1.22m)
maximum intervals in the United States and at
3 feet (1m) maximum intervals in Canada.
9. The exhaust vent system must remain at a
minimum distance of 6 inch (152mm) from all
combustible materials. Any part of the vent system
that passes through a combustible material must
be properly insulated.
NOTICE: Increasing the clearance distances may be
necessary if there is a possibility of distortion or
discoloration of adjacent materials.
For a VERTICAL vent pipe section that passes through
a fl oor or roof, an opening 4 inch (102mm) greater in
diameter is required. The opening must be insulated
and fl ashed in accordance with applicable installation
codes. Also see Figures 4a and 5a.
A HORIZONTAL section of an exhaust vent system that
passes through a combustible wall must be constructed
and insulated as shown in Figures 4b and 5b.
VENTING FOR SEPARATED COMBUSTION DUCT FURNACES
(CATEGORY III) (CONTINUED)