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Chapter 20
CATALYTIC CONVERTER (350X)
This wood heater contains a catalytic combustor, which
needs periodic inspection and replacement for proper
operation. It is against federal regulations to operate this
wood heater in a manner inconsistent with operating
instructions in this manual, or if the catalytic element is
deactivated or removed.
The Combustor supplied with the 350X is a Healthy Hearth
Combustor. The full assembly P/N 17094 can be obtained by
contacting your HEATMOR™. For Warranty claim information on the combustor (HEATMOR™
P/N 92942) contact your HEATMOR™ Dealer or HEATMOR™.
HEATMOR™
PO Box 787, Warroad, MN 56763
1-800-834-7552
Principle of the Catalytic Converter
The catalytic converter is equipped on the 350 X to reduce the emissions levels to a
satisfactory level. Without the Catalyst in place, the emissions levels of the stove are not
within the limit of the Phase 2 Hydronic Heater program. It consists of a ceramic Catalyst
insert in the front ue opening.
Operation of the Catalytic Converter
The catalyst consists of a ceramic porous material that is coated with precious metals.
The catalyst sits in the entrance of the ue where all of the ue gas has to go through. As
the catalyst heats up it reacts with the smoke and the oxygen in the ue gas and aids in
combustion. The temperature in the stove and the gases entering the combustor must be
raised to between 500° to 700°F for catalytic activity to be initiated. The induced draft of the
stove will bring the rebox temperatures up to the proper level as long as both the under
gate and over grate air is not restricted. Since the stove has an induced draft, there is no
need to have a bypass to help get the rebox temperatures high enough.
Maintenance / Result
“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 efciency, and an increase in creosote and
emissions. 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. Catalyst needs to be
brushed at least every three days to keep ash buildup from clogging the catalyst and
decreasing BTU output. Actual removal of the combustor 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 (or hybrid) heater is equipped with a temperature 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.
• An indication that the catalyst is not working properly is that there is excessive smoke
coming out of the chimney. This can be compared to the initial startup of the stove.
Catalytic Converter
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