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Evaporator drain
From Evaporator Coil
line required
Field Provided Vent
1" min. 2" max. above
(Trap at coil is optional)
condensate drain.
Field-Provided Vent
(1" min. to 2" Max.above
condensate drain connection)
Furnace Condensate
Condensate
Drain Condensate
Drain Connection
Optional
Overflow Switch
Figure 42. Furnace with Evaporator Coil Using a
Common Drain
Figure 41. Condensate Trap With Optional Overflow
Switch
(Unit shown in horizontal left−hand discharge position)
Field-Provided Vent
(4" min. to 5" Max. above
Evaporator
condensate drain connection)
Coil
4"min
5"max
5' max.
PVC Pipe Only
Condensate Drain
Connection
Drain Pan
(Trap at coil is optional)
Piping from furnace and evaporator coil must slope down a minimum 1/4" per ft. toward trap
Figure 43. Furnace with Evaporator Coil Using a Common Drain
Page 50
31-5000723 Rev. 0
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