508433-01Issue 2345Page 48 of 70
Figure 46. Condensate Trap with Optional Overow
Switch
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 47. Evaporator Coil Using a Common Drain
Figure 48. Evaporator Coil Using a Common Drain
Piping from furnace and evaporator coil must slope down a minimum 1/4” per ft. toward trap.
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