Inspecting And Cleaning The Heat Exchanger - Goodman GSM Installation & Operating Instructions Manual

Label all wires prior to disconnection when servicing controls. Wiring errors can cause dangerous
and improper operation. Verify proper operation after servicing.
It is the obligation of the installer to advise the user to have the furnace inspected and cleaned
annually. To clean the heat exchanger perform the following:
• Adjust the room thermostat to its lowest setting.
• Turn off the gas and electric supply to the furnace.
• Remove the control access door.
• Open the gas supply union.
• Disconnect the gas supply line attached to the gas valve.
• Remove the wires connected to the gas valve.
• Remove the burner box cover.
• Disconnect the combustion air supply pipe.
• Remove the burner box assembly. Care must be exercised to avoid damage to the hot surface
igniter.
• Inshot burners should not require cleaning. But if they exhibit signs of corrosion they can be cleaned
by brushing with a stiff wire brush.
• Remove the vent from the furnace venter blower.
• Remove the venter blower and collector box.
• With a stiff wire brush on a flexible handle remove any loose scale from the heat exchanger at both
the flue and burner openings.
• Use a 1/2" diameter brush to remove any deposits in the secondary heat exchanger.
• 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 does remain 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.
Note - It is important to use a pipe joint compound that is resistant to the effects of L.P. gas.
IO-176
INSPECTING & CLEANING THE HEAT EXCHANGER
CAUTION
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