Horizontal To Downflow Conversion; Condensate Drain (Air Conditioning); Air Filter Requirements; Removal Of Internal Filter Rack - Nordyne R8HE Series Installation Instructions Manual

• Securement of the drain line to the inside surface of
the roof curb is acceptable and should be made in the
wood nailer area (top 3.5") to avoid possible leaks or
penetrations to roofing materials.
• Cut and remove the insulation covering the 2" x 3"
condensate drain passage in outer panel (G) only. Before
installing inner panel (G) ensure there is enough slope
and there are no kinks or high spots that could trap
water in the line prior to entering the warmer interior of
the building where a drain trap is acceptable.
• All panels must be securely in place during rigging and
hoisting, except control access panel. See
for additional lifting and setting of unit requirements.

Horizontal to Downflow Conversion

The unit is shipped ready for horizontal duct connections.
If down flow ducts are required, the unit must be converted
following the steps below for both the supply and return
ducts.
1. Remove both horizontal duct caps.
2. Locate the duct cap inside the duct openings and remove
the screw holding it in place.
3. Lift the cap out of the unit. (Hint: The cap can be pushed
up from the bottom by reaching through the fork slot).
4. Cover the horizontal duct openings with the horizontal
duct caps removed earlier in step 1. The insulation will
be on the indoor side.
5. Fasten the cover with screws to seal.
6. Remove and discard the two wood supports beneath
the unit.

Condensate Drain (Air Conditioning)

Air conditioning condensate is removed from the unit
through the 3/4" female pipe and supplied fitting located
on the front side of the unit.
Install a 2 inch condensate trap in the drain line of the
same size and prime with water. When connecting rigid
drain line, hold the female fitting with a wrench to prevent
twisting. Do not over tighten! Refer to local codes and
restrictions for proper condensate disposal requirements.

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."
• A suitable air filter must be installed upstream of the
evaporator coil of the return air system. 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
page 48
Figure 4 (page 10).
Table 1 (page 10).
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
Nordyne internal filter kit be used or an air filter system
be installed in the return air ductwork. Three phase
models are factory equipped with an internal filter rack
ready to accept field supplied filters. See
specific unit model and filter sizes. Nordyne internal
filter rack adjusts for 1" or 2" filters.
• Horizontal installations require the air filter system be
installed in the return air ductwork.

Removal of Internal Filter Rack

(If Equipped, only required if economizer is
installed)
1. Remove the return air panel from the unit.
2. Remove the height adjustment screw from the inside
of the rack.
3. Remove (1) screw securing the assembly to the coil
located on the left leg of the rack. NOTE: The assembly
can now be easily collapsed and removed from the unit.
See Figure 5 (page 10)
locations.

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.

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.
Table 1
for filter rack securing screw
for
9