507769C05 Page 31 of 55
Figure 43. Unit with Cooling Coil Using Separate
Drain
Drain
Field Provided Vent
1” min. 2” max. above
condensate drain.
Condensate Drain
Connection
Evaporator Drain Line
(vent required)
A separate drain line must be run to the drain from the
condensate trap to ensure proper drainage and pressure
switch operation. DO NOT connect the condensate trap
drain into the drain line from the evaporator coil.
CAUTION
When combining the furnace and evaporator coil
drains together, the A/C condensate drain outlet must
be vented to relieve pressure in order for the furnace
pressure switch to operate properly.
IMPORTANT
Figure 44. Evaporator Coil Using a Common Drain
Field Provided Vent
1” min. 2” max. above
condensate drain.
Evaporator Drain Line
(vent required)
Condensate Drain
Connection
FurnaceCondensate
Drain
Connection
From Evaporator Coil
Optional
Field Provided Vent
1” min. 2” max. above
condensate drain.
Figure 45. Condensate Trap with Optional Overow
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