MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 6
Figure 5: Coil Cabinet Top Return Air Filter Location
Figure 4: Removing/Replacing the
Coil Cabinet Grille/Door
Replacement of Air Filters in Louvered Return Air Grille
Follow steps below to replace the filters in the louvered return air
grille.
1. Follow the “Turning Off / Shutting Down the Furnace”
procedure in the Section 4: Furnace Startup and Shutdown
Instructions of this manual.
2. Remove the thumb screw at the top center of the louvered
grille by turning it counter-clockwise (See Figure 4).
3. Pull the top of the grille outward and lift up on the grille until
the bottom tabs are out of the slots in the furnace top cover.
4. Turn the grille upside down and pull the bottom frame out to
gain access to the air filters.
5. Remove the two air filters.
NOTE: The filters are disposable. Do not attempt to clean the
filters and reuse them.
6. Slide the two new 20” x 20” x 1” (508mm x 508mm x 25.4mm)
air filters into the grille. Make sure the flow arrows on the filters
are pointing away from the grille louvers.
7. Reinstall the bottom frame.
8. Insert the two tabs on the bottom of the grille into the two
slots in the furnace top cover.
9. Push the top of the grille forward until it is aligned with the
cabinet top flange and side flanges (See Figure 4). Reinstall the
thumb screw to secure the grille to the coil cabinet.
10. Follow the “Turning On / Starting Up the Furnace” procedure in
the Section 4: Furnace Startup and Shutdown Instructions
of this manual.
Replacement of Air Filter in Top of Coil Cabinet
Follow the steps below to replace the filter located in the top of
the coil compartment.
1. Follow the “Turning Off / Shutting Down the Furnace”
procedure in the Section 4: Furnace Startup and Shutdown
Instructions of this manual.
2. Remove the thumb screw at the top center of the solid coil
cabinet door by turning the screw counter-clockwise.
3. Pull the top of the door outward and lift up on the door until
the bottom tabs are out of the slots in the furnace top cover.
4. Set the door on the floor.
5. Remove the air filter from the rack in the top of the coil cabinet
(See Figure 5).
NOTE: The filter is disposable. Do not attempt to clean the filter
and reuse it.
6. Slide the new 20” x 24” x 2” (508mm x 610mm x 50.8mm)
pleated air filter into the filter rack. Make sure the flow arrows
on the air filter are pointing toward the coil.
7. Insert the two tabs on the bottom of the coil cabinet door with
the two slots on the furnace top cover.
8. Push the top of the coil cabinet door forward until it is
aligned with the cabinet top flange and side flanges (See Figure
4).Reinstall the thumb screw to secure the door to the coil cabinet.
9. Follow the “Turning On / Starting Up the Furnace” procedure
in the Section 4: Furnace Startup and Shutdown Instructions
of this manual.
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