TW2000 WOOD–FIRED BOILER – INSTRUCTION MANUAL
TW2000 10 Jan-08
Never leave start up to the homeowner. Explain the operations thoroughly to the
operator.
2.4.1 COMBUSTION AIR SUPPLY
Air inlets of at least 200 square inches free area (1.5 in
2
/1000Btu) must be provided to the
room occupied by the wood fired or oil fired boiler. These fresh air inlets must provide or allow
free access of fresh outside air to the boiler. At no time, or under any circumstances can a
wood or oil burning appliance, be starved of combustion air.
The appliance must at all times be able to maintain the approved stack draft. The barometric
draft regulator must be installed on the boiler smoke pipe in the same room or at least in such
a way that there is unrestricted free passage of air between the combustion air inlet to the
boiler or burner and the barometric draft regulator.
It is important to provide adequate combustion air to the boiler. It may be necessary to add a
ventilator to an exterior wall of a closed boiler room or an airtight basement.
Operating a wood or oil fired appliance with inadequate combustion air could be hazardous.
2.4.2 FLUE PIPE & CHIMNEY
The Boiler must be located to meet a minimum venting distance needed between the Boiler
and the flue. It should also be ducted so that there are a minimum number of elbows used.
The flue pipe must be installed with a gradual rise of 1/2” or more per foot from the Boiler to
the flue.
NEVER ALLOW THE SMOKE PIPE TO RUN DOWNHILL TO THE FLUE!
The smoke pipe and chimney should be at least 7 inches in diameter. The flue pipe or a
chimney may be of different cross-sectional area than that of the appliance smoke pipe,
provided that sufficient draft is available at the appliance. Space must be provided around the
smoke pipe and the back of the Boiler to allow easy access for the purpose of cleaning.
Smoke pipes must not be lighter than 24 gauge black steel. All flue pipe must be securely
fastened with at least 3 sheet metal screws at every joint, and properly supported.
Always meet or exceed flue pipe clearance specifications - 18” clearance from flue pipe to
combustibles in all directions.
Connect the boiler only to an approved chimney suitable for solid fuel appliances and capable
of venting the products of combustion. The chimney must be installed with proper clearances
above roof and from adjacent structures and trees. If a masonry chimney is used it must be in
good condition and be equipped with a tile liner. Flue thimble or flue pipe must not extend into
the chimney flue, as it will reduce the draft.
Connect only to a flue or chimney capable of maintaining a negative draft of between .02”w.c.
min. and .05”w.c. max. at all times and conditions. To maintain this draft, one or two draft
regulators may be required. We recommend that the KERR TW2000 Wood-Fired Boiler be
connected to its own chimney. However, two or more fuel fired appliances, other than
fireplaces or incinerators, may be connected to the same chimney.
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