Comfort-Aire FMG****F1E Series - Manual (Page 11)

11
UNIT MAINTENANCE
Proper maintenance is most important to achieve the best
performance from a furnace. Follow these instructions for
years of safe, trouble free operation.
WARNING:
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD
Failure to follow safety warnings exactly could
result in serious injury or property damage.
Improper servicing could result in dangerous
operation, serious injury, death or property
damage.
• Before servicing, disconnect all electrical power
to air handler.
• When servicing controls, label all wires prior
to disconnecting. Reconnect wires correctly.
• Verify proper operation after servicing.
• These maintenance instructions are primarily intended
to assist qualified technicians experienced in the proper
maintenance and operation of this appliance.
• Always reinstall the doors on the furnace after servicing
or cleaning/changing the filters. Do not operate the
furnace without all doors and covers in place.
• Verify that the thermostat is properly installed and is
not being affected by drafts or heat from lamps or other
appliances.
• To achieve the best performance and minimize
equipment failure, it is recommended that a yearly
maintenance checkup be performed. At a minimum,
this check should include the following items:
Air Filter(s)
WARNING:
Never operate the furnace without a filter in
place. Dust and lint in the return air can build
up on internal components, resulting in loss of
efficiency, equipment damage, and possible fire.
FMG series air handlers are supplied with a single air
filter when shipped from the factory. It is recommended
that the filter be cleaned or replaced monthly. Newly built
or recently renovated homes may require more frequent
changing until the construction dust has minimized. Filter
sizes shown in Table 3 are available at most local home
improvement stores.
Filters designed to remove smaller particles such as
pollen, may require additional maintenance.
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.
Blower Fan Wheel
Inspect the blower wheel blades for accumulations of dirt
and clean if necessary. Inspect mounting nut for tightness
when done.
Blower Motor & Assembly
Inspect the blower assembly and motor mounting
brackets for tightness and corrosion. Correct deficiencies
if necessary. The blower motor contains sealed bearings
and under normal operating conditions, no maintenance
is necessary for the life of the equipment.
MODEL NUMBER FILTER SIZE
FMG18(****)F1E
16” x 20 x 1”
FMG24(****)F1E
FMG30(****)F1E 20” x 20 x 1”
FMG36(****)F1E 24” x 20 x 1”
Table 3. Filter Sizes
TROUBLESHOOTING
If the air handler fails to operate, check the following:
• Is the electric turned on?
• Is the thermostat operating properly?
• Are the blower compartment door(s) in place?
• Is the furnace disconnect closed?
• Has the circuit breaker tripped or the control board fuse
burned open?
• Are any manual reset switches open?
• Is the filter dirty or plugged?
• Is the LED on the furnace control board constantly ON?
If not, refer to Table 4 to determine fault condition.
Red LED (AN2) Diagnostic Description
OFF Control Fault (No Power)
Flash Blower Fault
ON Normal Operation
Table 4. Furnace Control Board Fault Conditions