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Consult with your insurance company to ensure
that the boiler to building clearances are acceptable.
Failure to do so may void insurance. The manufacturer
assumes no liability in the event of damages to
personnel or buildings.
6.7 Chimney Requirements
The chimney is a very important component in the
successful operation of the G-Class heater. A good
chimney provides a continuous, dependable draft to
ensure proper operation of the heater. If your furnace
is installed indoors, a continuous draft is especially
important to pull the exhaust gases out of the
building. The entire chimney exhaust system must be
designed to prevent possible soot build up, insufficient
draft, and condensation. Chimneys are very prone
to draft and creosote related problems when they
have diameters that are too large, are insufficiently
insulated, or when they have dents and bends.
Incorrect chimney installation will void the warranty.
The heater must be connected to a factory-built
chimney that must be designed for solid fuel
appliances, must be 6" in diameter, and must be UL-
103 or ULC-S629 listed. Chimneys that do not meet
these requirements MUST NOT be used for any part
of the chimney system. Never use black stove pipe
or uninsulated double wall chimney pipe for any part
of the chimney system. The chimney connection on
the G-Class heater will work best with the Security
Chimney ASHT+ 6" chimney system. Other chimney
systems can be used, but strictly follow the chimney
installation instructions for making a connection.
If a short piece of stove pipe is used to make the
connection, the stove pipe must be as short as
possible and must be insulated using suitable blanket
insulation. A dripless adaptor must be used at the
connection between the boiler and the factory-built
chimney. The top of the chimney must be at least 3
feet above the top of the roof penetration level and at
least 2 feet above any portion of the roof within a 10
foot diameter measured horizontally.
Always follow the chimney manufacturer's installation
instructions when installing and supporting a chimney.
All chimneys and connections must conform to
For service and support on your Polar Furnace contact your local dealer
SECTION 6: HEATER SETUP
all applicable standards and local codes. No other
appliance should be connected to the chimney unless
allowed by the local code authority. Consult your local
inspector for chimney requirements and install the
heater in accordance with all applicable codes.
6.7.1 Chimney Draft
When measuring draft, ensure that there is a fire in
the fire chamber, the fan has been on for at least 10
minutes and the water temperature in the boiler is
above 160˚F. This ensures the chimney is at proper
operating temperature. Breech draft is the draft near
the connection point to the furnace and should be
measured within 6" from the top roof panel of the
heater. Minimum breech draft is .02" water column.
Maximum breech draft is .14" water column. Strong
winds blowing across the top of a chimney (especially
a chimney which has a strong natural draft) can cause
the G-Class heater to continue firing when the fan has
switched off. This can cause the furnace to overheat.
If there is excessively high draft or an irregular draft, a
draft regulator must be used.
6.7.2 Draft Regulator
Whenever the breech draft exceeds .12" water column,
a draft regulator must be installed. The diameter of
the draft regulator used must be equal to or larger than
that of the chimney connector and should be installed
as close as possible to the boiler. If one draft regulator
is not sufficient to bring the draft below .10" water
column, a second draft regulator may be required.
After installing a draft regulator, the draft must always
be measured on the boiler side of the draft regulator.
The draft regulator adjustment should be made with
a vacuum gauge if possible. If the damper is adjusted
during warm weather, an adjustment may be required
during cold weather.
6.7.3 Off Cycle Draft
A slight but measurable draft during the off cycle is
required. The draft must persist for at least 30 minutes
after the fan has switched off. A draft during the off
cycle moves a very small amount of fresh air through
the heater which evacuates moisture laden air from
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