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IMPORTANT
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.
Condensate Trap With Optional Overflow Switch
From Evaporator Coil
HorizontalFurnace4" Min. to 5" Max.above
Optional
Figure 50
Evaporator
(Trap at coil is optional)
Drain Pan
condensatedrain connection)
FurnaceCondensate
DrainConnection
Furnace with Evaporator Coil Using a Common Drain
(Unit shown in horizontal left−hand discharge position)
Coil
Condensat e Drai n
Connection
Piping from furnace and evaporator coil must slope
down a minimum 1/4" per ft. toward trap
Furnace with Evaporator
Coil Using a Common Drain
(Trap at coil is optional)
(1" min. to 2" Max.above
condensatedrain connection)
Condensate
Drain Connection
4"min
5"max
5' max.
PVC Pipe Only
Figure 52
Page 34
Evaporator drain
line required
Figure 51
(4" min. to 5" Max.above
condensatedrain connection)
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