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3. Backpuffing
4. Smoke Rollout when Heater
Door is Opened
5. Low Catalytic Temperature
COMBUSTOR-RELATED
PROBLEMS
1. Plugging
2. Catalyst Peeling
3. Catalyst Masking
1. Gusts of wind / windy day
2. Hot combustor. (Above 1400
o
F)
1. Bypass damper is closed
2. Opened door too soon after
opening bypass damper
3. Wind gusts blowing
1. Bypass is open
2. Light-off not obtained
3. Fuel charge is spend
4. Combustor coated with fly ash or
soot
5. Heater dampered down too much
1. Burning materials that produce a
lot of char and fly ash
2. Burning wet, pitchy wood or
burning large loads of small-
diameter wood with the
combustor in the operating
position without light-off taking
place
1. Extreme temperatures at
combustor surface can cause the
catalyst to peel. Over-firing and
flame impingement are primary
causes
1. Not maintaining light-off
temperatures
1. If flue cap not on chimney,
install one.
2. Increase the amount of
combustion air slowly
1. Open bypass damper
2. Open bypass damper– wait
15-30 seconds before slowly
opening door
3. Install flue cap
1. Once light-off temperatures
have been reached and unit is
stabilized, close bypass
2. Follow manufacturer’s
operating instructions
3. Refuel as necessary for
combustor operation
4. See Section VII “Preventive
Maintenance”
5. Ensure that proper air mixture
and draft are available for
wood pyrolysis to continue
1. Do not burn materials such as
garbage, gift wrap or
cardboard
2. Burn dry, seasoned wood.
Don’t place the combustor in
the operating position until
high temperatures are high
enough to initiate light-off
1. If severe, remove and replace
catalysts. See “Catalyst
Replacement” Section VI.
Avoid extreme temperatures
1. See Section VI and review
operating instruction.