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6. Using two wrenches, separate the ground-joint union
in the gas supply piping at the furnace.
7. Remove the piping between the Gas Valve and the
ground-joint union. (If applicable).
8. Remove all screws securing the Manifold Assembly to
the Burner Box.
9. Carefully remove the burner assembly from the furnace.
DO NOT DAMAGE THE IGNITER WHILE REMOVING
THE BURNER ASSEMBLY.
10. Inspect the burners for accumulated dust or debris.
If necessary carefully clean them with a soft wire
brush and a vacuum cleaner. DO NOT DAMAGE THE
IGNITER WHILE CLEANING THE BURNER.
11. Replace all the parts in reverse order from which they
were removed.
12. Follow the lighting instructions found on the furnace
door to return the furnace to operation. Verify proper
operation after servicing.
Heat Exchanger & Burner Maintenance -
The furnace
should operate for many years without soot buildup in the
flue passageways, however, the flue, vent system, and
burners should be inspected and cleaned (if required) by
a qualified service technician annually to ensure continued
safe operation. Pay attention to any deterioration from
corrosion or other sources.
Lubrication -
The bearings in the blower motor and
inducer blower used in these furnaces are pre-lubricated
and sealed by the manufacturer. No further oiling of the
bearings is required for the life of the motor.
Vent System -
Check the inlet pipe (if applicable) and
outlet pipe to ensure they are not blocked by any debris.
Damaged vent pipe sections must be replaced and
any obstructions or blockages must be removed before
operating the furnace.
WARNING:
Holes in the vent pipe or heat exchanger can
cause combustion products to enter the home.
Replace the vent pipe or heat exchanger if leaks
are found. Failure to prevent the circulation
of combustion products into the living space
can create potentially hazardous conditions
including carbon monoxide poisoning that
could result in personal injury or death.
maintenance checkup be performed.
At a minimum,
this check should include the following items:
Air Filter(s) -
An air filter is supplied with the furnace as
shipped from the factory. It is recommended that filters be
cleaned or replaced monthly during the heating season.
WARNING:
Never operate the furnace without a filter in
place. Dust and lint can build up on internal
components, resulting in loss of efficiency,
equipment damage, and possible fire.
New or newly renovated homes may require more frequent
changing until the construction dust has minimized. Filters
designed to remove smaller particles such as pollen, may
require additional maintenance. Filters for side return and
bottom return applications are available from most local
distributors.
Upflow Furnaces: the filter is located inside the blower
compartment underneath the blower. To replace the filter:
1. Remove the lower compartment door.
2. Slide the filter backwards until the edge of the filter
clears the front flange of the furnace.
3. Lift the filter up over the flange and out through the front
of the furnace.
4. Install new filter in reverse order of the removal
instructions. NOTE: Center the filter over the return
opening and secure it to the fastener at the rear of the
furnace compartment.
Downflow Furnaces: the filter sits on three filter brackets
located on top of the furnace. The filter can be easily
removed and replaced. Do not remove the filter brackets.
When installing the new filter, make sure it is centered
over the return air opening.
Blower Compartment -
Dirt and lint can create excessive
loads on the motor resulting in higher than normal operating
temperatures and shortened service life. It is recommended
th-at the blower compartment be cleaned of dirt or lint
that may have accumulated in the compartment or on
the blower and motor as part of the annual inspection.
Clea
ning of Burners -
If the burners must be cleaned,
for
component location and identification.
1. Shut off gas supply to the furnace at the meter or at a
manual valve in the supply piping.
2. Turn off all power to the furnace and set the thermostat
to it’s lowest setting.
3. Remove the burner door from the furnace.
4. Turn the gas control switch to the OFF position.
5. Disconnect the wires from the gas valve, igniter, flame
sensor, and flame rollout switch.
Summary of Contents for M4RC-072D-35C
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