AAON M3-094 - Manual (Page 46)

46
Figure 22 - Supply Fan Banding
Condensate Drains
The primary condensate drains must be
trapped for proper operation. Draw-through
cooling coils will have a negative static
pressure in the drain pan area. This will
cause an un-trapped drain to back up due to air being pulled up through the condensate
drain piping. Blow-through coils will have a
positive static pressure in the drain pan. The
condensate piping on these drain pans must
be trapped to prevent pressure loss through
the drain.
Condensate drain trapping and piping should
conform to all applicable governing codes.
Note: The drain pan connection is a 1.5”
MPT fitting.
Condensate drains that are not
properly trapped could cause drain
pans to overflow possibly resulting in
water damage to building.
WARNING