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8
SECTION II: FURNACE MAINTENANCE
The interior sections of the furnace must be cleaned and
adjusted by a qualified service contractor once a year or before
the start of each heating season. The following items must be
checked:
1.
The blower wheel and motor for excessive dirt.
2.
The electric heaters for wear, damage or corrosion.
3.
The supply air duct system for excessive dust, dirt or
debris
4.
The return air duct system for excessive dust, dirt or
debris
5.
All electrical wiring for wear and/or damage.
6.
Check the air conditioning evaporator coil for dust,
debris or damage.
7.
Check the evaporator coil drain pan for proper
drainage to prevent water backup into the furnace.
8.
The furnace casing and all interior sheet metal panels
or dividers.
Furnace Cleaning Procedure
1.
Follow the instructions exactly as shown for “Turn
ON / Start Appliance” and “Turn OFF / Shut Down
the Appliance” in this manual to properly operate this
appliance.
2.
Remove the access door on the front of the furnace.
3.
Remove the access door on the front of the
evaporator coil cabinet.
4.
Remove the screw on the right side of the control box
cover and remove the control box cover. Refer to
Figure 8.
5.
Remove the blower mounting screw on the right front
side of the blower mounting plate and slide the
blower out of the furnace. Refer to Figure 9.
Figure 8: Control Box Cover
Figure 9: Blower Mounting Screw
6.
Use a vacuum cleaner and a small brush to remove
any dirt and debris from the blower compartment.
7.
Check in the area below the blower compartment
where the heater elements are located and remove
any dust, dirt or debris from around the heater
elements. Be careful not to damage the heater
elements with the vacuum hose or the brush.
8.
Check the blower wheel for dust and debris. Use the
brush and the vacuum cleaner to remove any dust or
debris from the wheel. Be careful not the move or
accidentally remove the blower wheel balance weight
located on the wheel fins. If it is moved or removed it
will cause the blower wheel to vibrate. If the wheel is
vibrating, you must replace it.
ELECTRICAL SHOCK, FIRE HAZARD
Failure to follow the safety warnings exactly could result
in dangerous operation, serious injury, death, or
property damage.
Improper servicing could result in dangerous operation,
serious injury, death, and/or property damage
.
Before servicing, disconnect all electrical power to
the furnace. Make sure you disconnect both power
supplies if the furnace has a dual power supply
circuit. Dual circuits may be used on the 15kW,
17kW and 20kW furnaces.
When servicing controls, label all wires prior to
disconnecting to aid in proper reconnection of
wires.
Verify proper operation after servicing by turning
the thermostat above the room temperature for a
brief period of time to ensure future furnace
operation.
Placing jumper wires between the RED and
WHITE wires at the furnace in order to override
the thermostat and energize the heater elements is
an extremely dangerous practice that can result in
damage to the thermostat, dangerous operation,
serious injury, death, and/or property damage.