508107-01
Issue 2041
Page 42 of 58
Figure 48. Condensate Trap with Optional Overflow
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 49. Evaporator Coil Using a Common Drain
Figure 50. Evaporator Coil Using a Common Drain
Piping from furnace and evaporator coil must slope down a minimum 1/4” per ft. toward trap.