Allied Air 97G2DFV Installation Instructions Manual page 32

Field-Provided Vent
From Evaporator Coil
(Upflow Furnace 1" Min. to 2" Max.
Horizontal Furnace 4" Min. to 5" Max.
Field Provided Vent
above condensate drain connection)
1" min. 2" max. above
condensate drain.
Condensate
Drain Connection
Furnace Condensate
Drain Connection
Optional
Overflow Switch
Evaporator Drain Line
(vent required)
Drain
Figure 48. Evaporator Coil Using a Separate Drain
Figure 50. Condensate Trap with Optional Overflow
Switch
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.
Field Provided Vent
1" min. 2" max. above
condensate drain.
Condensate
Drain Connection
Evaporator Drain Line
(vent required)
Figure 49. Evaporator Coil Using a Common Drain
Page 32 of 53 Issue 2332 508405-01