Air Filters; Blower Compartment; Cleaning Of Burners; Heat Exchanger And Burner Maintenance - Nordyne M4RC Upflow Installation Instructions Manual

Air Filter(s)
WARNING:
Never operate the furnace without a fi lter in
place. Dust and lint can build up on internal
components, resulting in loss of effi ciency,
equipment damage, and possible fi re.
NOTE: An air fi lter is supplied with the furnace as shipped
from the factory. It is recommended that fi lters be cleaned
or replaced monthly during the heating season. 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.
For upfl ow models, the fi lter is located inside the blower
compartment underneath the blower. To replace the
fi lter:
1. Remove the lower compartment door.
2. Slide the fi lter backwards until the edge of the fi lter
clears the front fl ange of the furnace.
3. Lift the fi lter up over the fl ange and out through the
front of the furnace.
4. Install new fi lter in reverse order of the removal
instructions. NOTE: Center the fi lter over the return
opening and secure it to the fastener at the rear of
the furnace compartment.
For downfl ow models, the fi lter sits on three fi lter brackets
located on top of the furnace. The fi lter can be easily
removed and replaced. Do not remove the fi lter brackets.
When installing the new fi lter, 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 that 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.

Cleaning of Burners

If the burners must be cleaned, follow steps 1 - 12. See
Figure 45 or 46 (page 47) for component location and
identifi cation.
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, fl ame
sensor, and fl ame rollout switch.
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 and Burner Maintenance

The furnace should operate for many years without soot
buildup in the fl ue passageways, however, the fl ue, vent
system, and burners should be inspected and cleaned
(if required) by a qualifi ed 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.
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