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