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ROTATE
ROTATE
Figure 6
Cleaning Procedure (see Figure 6):
1. Rotate the retainers to release the combus-
tor support plate while holding it to make
sure it does not drop.
2. Rotate the support plate and remove the
PROBLEM
Crumbling Substrate
(See Photo #1)
Fly-Ash Build-up
(See Photo #2)
Fly-Ash Masking
(See Photo #5)
Fly-ash Plugging
(See Photo #6)
Thermal Cracking
(See Photo #3)
Mechanical Cracks
(See Photo #4)
Creosote Plugging
(See Photo #7)
Masking (Soot)
(See Photo #8)
8
Photo #1 Crumbling
combustor.
3. Remove fl y ashes on the combustor using
a soft brush.
4. Put the combustor back in place.
ROTATE
Catalyst Monitoring
It is important to periodically monitor the
operation of the catalytic combustor to ensure
that it is functioning properly and to determine
when it needs to be replaced. A non-functioning
combustor will result in a loss of heating ef-
fi ciency, and an increase in creosote and emis-
sions. Following is a list of items that should
be checked on a periodic basis:
• Combustors should be visually inspected at
least three times during the heating season
to determine if physical degradation has
occurred. Actual removal of the combustor
Catalyst Troubleshooting — Problems, Causes and Solutions
POSSIBLE CAUSE
Flame impingement
Flames contacting combustor
Flame impingment
High draft
Combustor has not maintained light-off tempera-
ture.
Combustor has not maintained light-off tempera-
ture.
Burning materials that produce a lot of char and
fl y-ash.
Closing the bypass too soon.
Thermal Shock
Moisture, wet logs
Uneven temperatures and heat spikes.
Burning appliance with the door open.
Combustor mishandled or abused.
Distortion of combustor holder.
Burning wet, pitchy woods or burning large loads
of small diameter wood with the combustor in the
operating position without light-off ever occurring.
Combustor has not maintained a light-off.
Burning coal will cause a sulfur-based compound
to coat the catalyst.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
WHAT TO DO
Reduce air volume to logs; don't overload wood box.
Bypass combustor when the appliance is running in high-fi re mode.
Lower fl ames by reducing air to logs. Use less logs in the fi rebox.
Do not exceed .06" of water draft. Install a manual damper and draft
gauge or a barometric damper.
Brush cold combustor with a soft bristled brush or vacuum lightly.
Brush cold combustor with a soft bristled brush or vacuum lightly.
Do not burn cardboard, gift wrap or garbage.
Follow instructions for proper light-off.
Burn dry, seasoned logs only.
If cracking causes large pieces to fall out, replace the combustor.
Check appliance for air leaks.
Handle combustor with care. Replace if necessary.
Replace combustor if large pieces are missing, replace any warped
appliance parts as well.
Check appliance for air leaks.
Burn dried seasoned wood. Make sure combustor has light-off before
closing the bypass damper. It may be possible to burn the soot or creosote
accumulation off by putting the combustor in a partially open and partially
closed position after a hot fi re has been started. Burn hardwoods.
Place combustor in a partially open and partially closed position after a
hot fi re has been started to burn off the soot accumulation.
Revert to burning wood and fi re the combustor to elevated temperatures
for one hour.
Photo #2 Fly-Ash
is not recommended unless more detailed
inspection is warranted because of decreased
performance. If any of these conditions exists,
refer to Catalyst Troubleshooting section of
this owner's manual.
• This catalytic heater is equipped with a tem-
perature probe to monitor catalyst operation.
Properly functioning combustors typically
maintain temperatures in excess of 500°F, and
often reach temperatures in excess of 1,000°F.
If catalyst temperatures are not in excess
of 500°F, refer to Catalyst Troubleshooting
section of this owner's manual.
• You can get an indication of whether the cata-
lyst is working by comparing the amount of
smoke leaving the chimney when the smoke
is going through the combustor and catalyst
light-off has been achieved, to the amount of
smoke leaving the chimney when the smoke
is not routed through the combustor (bypass
mode).
Photo #3 Thermal Cracks
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