Allied A96US2V - Common Drain Connections for Furnace and Evaporator Coil

507404-02 Page 37 of 80Issue 1448
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
Condensate Trap with Optional Overow Switch
Figure 53
Figure 55
Evaporator Coil using a Common Drain
*Piping from furnace must slope down a minimum of 1/4” per ft. toward trap.
Figure 54
Evaporator Coil using a Common Drain