10
Step 4 — Connect Piping —
CONDENSATE PIPING — The unit is supplied with a one-
inch OD drain connection to connect copper or PVC drain
piping as shown in Fig. 12. Units of capacity size 36-54 kBtu/h
come with a factory-installed condensate pump. Maximum
pump lift is 27-1/2 inches. Units of capacity size 72-96 kBtu/h
do not have a factory-installed condensate pump.
Fig. 12 —Condensate Drain Connection (036-054)
Fig. 13 —Condensate Drain Connection (072-096)
When installing condensate piping, follow these guidelines:
• The highest point in the condensate piping should be as
close to the unit as possible. See Fig. 14.
• 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. 14 —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 switch CN5, which can be used for
gravity drain protection. See Fig. 15.
Fig. 15 —Using a Main Drain to Serve Multiple
Indoor Units with Internal Condensate Pumps
Fig. 16 —Trap at Piping End