11
Figure 4. Refrigerant Service Ports & Air
Conditioning Condensate Drain Locations
HIGH SIDE
LOW SIDE
CONDENSATE
DRAIN
Securing
Screws
Figure 5. Internal Filter Rack Location
Air Filter Requirements
WARNING:
Never operate the unit without a filter in place.
Dust and lint could accumulate on internal parts,
resulting in loss of efficiency, equipment damage
and possible fire.
NOTE TO INSTALLER:
After installing or replacing the
filtration system for this unit, add the following statement
on or adjacent to the filter service panel:
“Replace
filter(s) installed in your system only with the same
dimensional size filters that are being replaced.”
• An air filter is not supplied with this package unit as
shipped from the factory. The installer must provide
a high velocity filter that is appropriately sized to the
return air duct opening or internal filter rack. The filters
must comply with ANSI/UL 900 or CAN/ULC-S111.
• For recommended external filter sizes, refer to
• All return air must pass through the filters before entering
the evaporator coil. It is important that all filters be kept
clean and replaced frequently to ensure proper operation
of unit. Dirty or clogged filters will reduce the efficiency
of the unit and result in unit shutdowns.
• Air filter pressure drop is recommended not to exceed
0.08 inches WC.
• Single phase downflow applications require either a
Nortek internal filter kit be used or an air filter system
be installed in the return air ductwork. See
for
specific unit model and filter sizes. Nortek internal filter
rack adjusts for 1” or 2” filters. To convert the unit from
1 inch to 2 inch filters, see 1” to 2” Filter Conversion
section below.
• Horizontal installations require the air filter system be
installed in the return air ductwork.
Installing Filters in the Internal Filter Rack
(If Equipped)
1. Remove access panel screws from return air panel.
(
Hint:
Loosen the unit’s top panel screws near the
top edge of the access panel. The access panel was
designed to be captured underneath the top panel.)
2. Slide the first filter between both guide channels of filter
rack and
allow the filter to drop easily into place.
3. Verify the bottom of the filter is within the channels of
the rack.
4. Slide the 2nd filter (and 3rd filter on taller models)
between both guide channels of filter rack.
5. Verify the top of the filter is within the channels of the
rack.
6. Replace access cover by sliding the top edge of panel
under the lip of the unit’s top panel. Secure access
panel by replacing the screws.
1” to 2” Filter Conversion
Factory installed internal filter rack (3 phase models only)
is set up to accept 1” filters. If conversion to 2” filters is
desired, remove the two (or three) 1” filter adaptors secured
in the assembly with clips by pulling straight off the frame.
The filter bracket must be reoriented to accept 2” filters by
removing two screws securing it to the hinge and rotating
180 degrees. See
Removing Filters from Internal Filter Rack
(If Equipped)
1. Remove access panel screws from return air panel.
(
Hint:
Loosen the unit’s top panel screws near the
top edge of the access panel. The access panel was
designed to be captured underneath the top panel.)
2. Remove upper filter by gently pulling filter through the
access panel opening.
3. Remove lower filter by lifting media to top of filter rack.
Remove in the same manner as described in step 2.
4. Install new filter in the filter rack as described in the
previous section.
