Pull the top out to remove
Air Filters are located on the back of this door
MORTEX PRODUCTS INC 501 TERMINAL RD FORT WORTH, TX 76106 Page 8
This furnace requires maintenance at the beginning of each heat-
ing season to assure proper operation. The annual service must be
performed by qualied service technician. The homeowner/user
is expected to perform general cleaning of the exterior surfaces,
clean dust from the louvers in the return air door, and replace-
ment of the air lters. Air lters must be checked every month
and replaced as needed. Figures 6 and 7 show the location of the
air lters in the louvered return air door. If the louvered return air
grille does not contain lters, the return air lters may be located
in a return air lter grille on the closet wall.
Before proceeding, make sure the area is well ventilated.
Turn the thermostat mode to “OFF”. If the circulating
blower is running, wait until it stops automatically. Follow
the “Shutting the Furnace O” instructions located in
Section 3: Startup and Shutdown Instructions on page
7 of this manual. Check all metal parts and surfaces to
make sure they have cooled to room temperature before
performing maintenance on the furnace.
SECTION 4: HOMEOWNER/USER MAINTENANCE
Figure 6: Louvered Return Air Door - Outside
Figure 7: Louvered Return Air Door Filter Rack
(Requires Two 16” x 20” x 1” High Velocity Air Filters)
Every time the lters are changed, the following items should be
visually inspected.
• Check combustion air and vent pipe for blockage.
• Check for leaks in the vent pipe.
• Check for dirt or lint on any surfaces or on components.
Do not try to clean any of the surfaces or components or try to
repair or replace any components. Cleaning of the furnace and
its components and repairing or replacing components must be
done by a qualied service professional.
• Check for excessive amounts of dirt and lint on components.
• Check for obvious damaged or deteriorated components or
surfaces.
• Check for water on any surface inside or outside of the furnace.
If during the visual inspection of the furnace any of the above
conditions are found, do not operate the furnace. Call a qualied
service technician to check, clean, or repair the furnace. The
service technician can provide additional information or answer
questions about the operation of the furnace and why the furnace
must be checked or cleaned.
If all components appear to be in good operating condition,
replace the front panels and follow the “Starting the Furnace”
instructions in Section 3: Startup and Shutdown Instructions on
page 7 of this manual.
Replacing Air Filters in the Louvered Return Air Door
All models require two 16” x 20” x 1” high velocity pleated air
lters which are located in the louvered return door on the front
of the furnace.
Follow the steps below to replace the air lters located in the
furnace louvered return air door.
1. Follow the procedure “Shutting the Furnace O” in Section 3:
Startup and Shutdown on page 7 of this manual.
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