IO137 19
• With a stiff wire brush on a flexible handle remove any loose scale from the heat exchanger at
both the flue and burner openings.
• With a vacuum remove any loose scale dislodged and any additional debris found in the heat
exchanger.
• Visually inspect the heat exchanger cells for any failures using a bright light. If any failures
are discovered it is important to disable the furnace and notify the user to ensure that it
remains inoperable until repairs are implemented.
• Reassemble the furnace in the reverse order. Note: No additional screws or wires are supplied
with this product. All components must be reassembled to avoid an unsafe condition.
• Reconnect gas supply and check for leaks using a soap solution. If a flexible gas line is used
examine it for cracks or weakness. Replace if necessary.
• Restore electrical power.
• Follow the lighting instructions to place the furnace into operation.
SOURCE OF COMBUSTION AIR
The recommended source of combustion air is the outdoor air supply. However, the use of indoor
air in most applications is acceptable except as follows;
1. If the furnace is installed in a confined space it is recommended that the necessary combustion/
ventillation air originate via the attic, crawl space, or direct opening to the outside.
2. If indoor combustion is used, there must be no exposure to the substances.
3. The following installations may require OUTDOOR AIR for combustion, due to chemical expo-
sures;
• Commercial buildings
• Buildings with indoor pools
• Furnaces installed in laundry rooms
• Furnaces installed in hobby or craft rooms
• Furnaces installed near chemical storage areas
Exposures to the following substances in the combustion air supply may also require OUTDOOR
AIR for combustion;
• Permanent wave solutions
• Chlorinated waxes and cleaners
• Chlorine based swimming pool chemicals
• De-icing salts or chemicals
• Carbon tetrachloride
• Halogen type refrigerants
• Masonry acid washing materials
• Cleaning solvents (such as perchloro-
ethylene)
• Printing inks, paint removers, varnishes,
etc.
• Hydrochloric acid
• Cements and glues
• Antistatic fabric soft
• eners for clothes dryer
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