Sterling GG - Manual (Page 7)

INSTALLATION - VENTING – CATEGORY III
COMBUSTION AIR
Never operate unit heaters without
combustion air and flue 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 (symptoms include grogginess, lethargy,
inappropriate tiredness, or fl u-like symptoms).
1. The combustion air system installation must be in
accordance with the current edition of the National
Fuel Gas Code-NFPA 54 or ANSI Z223.1 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. The combustion air inlet box, inlet air screen,
defl ector disk, and vent terminal provided with the
unit heater must be installed at the termination point
of the combustion air/vent system. See Figures 1, 2,
4, 5, and 6.
3. Each unit heater MUST have its own combustion
air system. It MUST NOT be connected to other air
intake systems.
4. Combustion air intake duct may be PVC, CPVC,
Type B vent, single wall, double wall or other material
approved by local code authority. Never use duct size
other than diameter stated in these instructions.
5. Long runs of single wall combustion air piping
passing through an unheated space may require
insulating if condensation becomes noticeable.
6. The combustion air system must be installed to
prevent collection of condensate. Pitch horizontal
pipes downward 1/4 inch per foot toward the inlet
cap to facilitate drainage. Vertical combustion air
pipes should be piped as depicted in Figure 7.
7. The equivalent length of the combustion air system
must not be less than 5 feet (1.5m) and must not
exceed 30 feet (9m). Equivalent length equals the
total length of straight pipe plus 5 feet (1.5m) for each
90° elbow and 2.5 feet (0.76m) for each 45° elbow.
NOTICE: For optimum performance keep the
combustion air system as straight as possible.
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 silicone
sealant with a temperature rating of 500°F may be
used instead of the tape.
9. For horizontal combustion air systems longer than
5 feet (1.5m), the system must be supported from
overhead building structures at 4 foot (1.2m) intervals
in the U.S. and at 3 foot (0.91m) intervals in Canada.
EXHAUST VENTING
NOTICE: Every unit converted to Separated
Combustion MUST use a factory supplied Combustion
Air Inlet Kit. If you do not have this kit, contact your
supplier ASAP to obtain one prior to installation.
Never operate unit heaters
without combustion air and flue gas piping in
place or severe personal injury or death may
occur!
1. Vent system installation must be in accordance with
the current National Fuel Gas Code-NFPA 54 or
ANSI Z223.1 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 factory supplied Combustion Air Inlet Kit (which
includes a combustion air inlet box, air inlet
screen, defl ector disk, vent terminal and inlet air
collar) MUST be installed at the termination point
of the combustion air/vent system. See Figures 1,
2, 4, 5, and 6.
3. Each unit heater MUST have it’s own vent system. It
MUST NOT be connected to other vent systems or
to a chimney.
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