12
PN 20009722 REV F, [08/01/2020]
CONDENSATE PIPING
Cassette is supplied with 1/2 in (12.7 mm) I.D. flexible PVC
hose for connection to copper or plastic drain piping. See
Figure 13.
Condensate Piping
1.
Maximum pump lift is 36 in (910 mm) from base or
bottom of unit.
2.
Highest point in condensate piping should be as close
to unit as possible. Prevents large volume of water
draining back into unit when it is switched off. See
Figure 12.
3.
Check valve at pump discharge to prevent water from
draining back into unit. Piping technique minimizes
issues if check valve is stuck open from airborne debris.
4.
Slope condensate pipe-work downward from highest
point in direction of water flow with minimum gradient
of 1 in per 10 ft (8 mm per 1 m). No uphill gradients
except in first 18 in (460 mm) of pipe-work from
cassette. See Figure 12.
5.
When multiple cassettes are connected to common
condensate drain, ensure drain is large enough to
handle total volume of condensate.
6.
Drain line vent may be required to prevent siphoning of
water from drain pan and associated noise.
NOTICE
Insulate chilled water and condensate pipes up to
chassis to prevent condensation which may damage
ceiling and objects located below.
Insulate chilled water valves to prevent sweating.
Figure 12
- Highest Point Of Condensate
Piping Should Be As Close To Unit As
Possible
Figure 13 - Condensate Drain
