IO-151
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building. Turn on clothes dryers and any other appliance not connected to the venting system.
Turn on any exhaust fans such as range hoods and bathroom exhausts, so they shall operate at
their maximum speed. DO NOT operate a summer exhaust fan (whole house fan). Close fireplace
dampers;
d) Follow lighting instructions. Place the appliance being inspected in operation. Adjust the
thermostat so the appliance shall operate continuously;
e) Test for draft hood equipped appliance spillage at the relief opening after five (5) minutes of
burner operation. Use the flame of a match or candle;
f) After it has been determined that each appliance connected to the venting system properly
vents when tested as outlined above, return all doors, windows, exhaust fans, fireplace dampers
and any other gas-burning appliance back to their previous condition of use;
g) If improper venting is observed during any of the above tests, the venting system must be
corrected.
If resizing of the existing vent is required this shall be sized in accordance with Appendix G of the
National Fuel Gas Code, ANSI Z223.1 or CAN/CGA B149 Installation Codes.
INSPECTING & CLEANING THE HEAT EXCHANGER
CAUTION
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 assembly. Care must be exercised to avoid damage to the igniter.
•
Inshot burners should not require cleaning. However, 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 cracks or openings 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.
