9
Apply Foam Insulating Tape
1. Apply foam insulating tape to the return air opening on
the bottom of the unit. See Fig. 11 below.
Fig. 11 —Applying Foam Insulation Tape
2. Use the existing screws to re-install the return air cover
plate on the rear of the unit.
Re-install Air Filter and Frame — Re-install the return air
filter and the filter frame on the bottom of the unit. Refer to the
arrows in Fig. 12.
Fig. 12 —Re-installing Return Air Filter and Frame
Secure the Frame and Filter — Use the provided clips to
secure the filter inside the filter frame. See Fig. 13.
Fig. 13 —Securing the Filter and Frame
Step 4 — Connect Piping
CONDENSATE PIPING — The unit is supplied with a 1
inch OD drain connection to connect copper or PVC drain
piping. See Fig. 14. Maximum pump lift is 27-
1
/
2
inches.
Fig. 14 —Condensate Drain Connection
Follow these recommendations when installing condensate
piping:
• The highest point in the condensate piping should be as
close to the unit as possible. See Fig. 15.
• Condensate piping should slope downward in the
direction of condensate flow with a minimum gradient of
1 inch per 100 inches. See Fig. 15.
Fig. 15 —Condensate Piping
• When multiple units are connected to a common
condensate drain, ensure that the drain is large enough to
accommodate the volume of condensate from all units. It
is also recommended to have an air vent in the
condensate piping to prevent air lock.
• Condensate piping must not be installed where it may be
exposed to freezing temperatures.
NOTE:
CN18 can be disconnected to stop the pump. The
condensate switch is CN5, which can be used for gravity drain
protection. See Fig. 16.
Fig. 16 —Using a Main Drain to Serve Multiple Indoor Units with Internal Condensate Pumps
FOAM
INSULATING
TAPE
RETURN AIR
FILTER
DETAIL
CLIP
FILTER
INSULATION
INDOOR
UNIT
CONDENSATE
HOSE CLAMP
LINE STUB
FLEXIBLE DRAIN
CONNECTOR
PVC DRAIN
PIPE
SUSPENSION RODS
STRUCTURAL CEILING
8 in.
Max 27-1/2 in.
3 ft.
SUPPORT
STRAPS
DRAIN LINE
