Lennox ML196DF045XE36B Manual page 37

Condensate Trap With Optional Overflow Switch
From Evaporator Coil
Optional
FIGURE 46
ML196DFE with Evaporator Coil
Using a Separate Drain
Field Provided Vent
1" min. 2" max. above
condensate drain.
Condensate Drain
Connection
Evaporator Drain Line
(vent required)
FIGURE 47
Field Provided Vent
1" min. 2" max. above
condensate drain.
FurnaceCondensate
Drain Connection
Drain
Page 37
IMPORTANT
When combining the furnace and evaporator
coil drains together, the A/C condensate drain
outlet must be vented to relieve pressure in or­
der for the furnace pressure switch to operate
properly.
ML196DFE with Evaporator
Coil Using a Common Drain
Field Provided Vent
1" min. 2" max. above
condensate drain.
Condensate Drain
Connection
Evaporator Drain Line
(vent required)
FIGURE 48