MORTEX
PRODUCTS
INC
FORT
WORTH,
TX
76106
Page
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 electrical components for excessive dust, dirt, wear,
or deterioration.
4.
The supply air duct system for excessive dust, dirt or
debris
5.
The return air duct system for excessive dust, dirt or
debris
6.
All electrical wiring for wear, insulation cracks and/or
damage.
7.
Check the air conditioning evaporator coil for dust, debris
or damage.
8.
Check the evaporator coil drain pan for proper drainage to
prevent water backup into the furnace.
9.
The furnace casing and all interior sheet metal panels or
dividers.
Furnace Cleaning Procedure
1.
Follow the instructions exactly as shown in Start Up and
Shutdown Section in this manual to properly shutdown
this appliance.
2.
Remove the lower access door on the front of the furnace.
3.
Remove the upper access door on the front of the
evaporator coil compartment.
4.
Remove all 6 screws on the control box cover and remove
both covers. Refer to Figure 7.
5.
Remove the two screws on the right side of the blower
mounting plate and slide the blower out of the furnace.
Refer to Figure 8.
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.
Figure 7: Control Box Cover
Figure 8: Blower Assembly and Mounting Screw Location
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 to move or
accidentally remove the blower wheel balance weight
located on the wheel blades. If the wheel weight is moved
or removed, it will cause the blower wheel to vibrate. If
the wheel is vibrating, you must replace it.
9.
Check the blower motor for dust and debris. Be sure to
clean the openings on the motor housing as these
openings are used to cool the motor. If the dust, dirt or
debris has not been removed from these openings it will
cause the motor to run hotter than normal and will shorten
the life of the motor.
10.
Check and clean with the brush and vacuum cleaner any
dust in the supply and return ducts as far as you can reach.
If these ducts look like they have an excessive amount of
dust, dirt or debris you should recommend to the home
owner or user to call a professional to properly clean the
duct system.
11.
Check and clean any dust, dirt, or debris from all of the
controls and all of the surfaces in the control box. If dust
or dirt is left on the components they will operate at a
much hotter temperature causing premature component
failure.
12.
Check the evaporator coil compartment for dirt, dust or
debris and remove any that exists.
13.
Check the evaporator condensate drain pan for any debris
and ensure the pan is properly draining by pouring water
into the drain to check it.
14.
Remove any excess water that may have spilled from
checking the evaporator condensate drain.
FIRE HAZARD
NEVER PLACE A JUMPER BETWEEN “R” & “W”
Placing jumper wire between the RED and WHITE
thermostat 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, property
damage and/or death.
