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Field Provided Vent
1" min. 2" max. above
condensate drain.
Condensate
Drain Connection
Evaporator Drain Line
(vent required)
Figure 45. Evaporator Coil Using a Separate Drain
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.
Field Provided Vent
1" min. 2" max. above
condensate drain.
Condensate
Drain Connection
Evaporator Drain Line
(vent required)
Figure 46. Evaporator Coil Using a Common Drain
507962-01G / 31-5000654
CAUTION
From Evaporator Coil
Drain
Figure 47. Condensate Trap with Optional Overflow
Issue 2149
Field-Provided Vent
(Upflow Furnace 1" Min. to 2" Max.
Horizontal Furnace 4" Min. to 5" Max.
above condensate drain connection)
Optional
Overflow Switch
Switch
Furnace Condensate
Drain Connection
Page 31 of 51
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