507270-03Page 36 of 60 Issue 1621
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.
IMPORTANT
Figure 52
Condensate Trap with Optional Overow Switch
Figure 53
Evaporator Coil Using a Common Drain
Figure 54
* Piping from furnace must slope down a minimum of 1/4” per ft. toward trap.
Evaporator Coil Using a Common Drain
(Unit shown in horizontal left-hand discharge position)
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