12
UNIT MAINTENANCE
Proper maintenance is most important to achieve the
best performance from a electric furnace. Some of the
components and their locations are shown in Figure 10
(page 14). If any component of the electric furnace must
be replaced, use only factory authorized replacement parts
specified in the Replacement Parts List provided online.
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 electric furnace.
• 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 electric furnace after
servicing or cleaning/changing the filters. Do not operate
the electric 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) -
B5BV series electric furnaces are not
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 2 are
available at most local retailers.
WARNING:
Never operate the electric 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.
Filters designed to remove smaller particles such as
pollen, may require additional maintenance.
CABINET SIZE
FILTER SIZE
A
12 x 20 x 1
B
18 x 20 x 1
C
20 x 20 x 1
Table 2. Filter Sizes
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.
TROUBLEShOOTING
If the electric furnace 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 electric 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?
