Lennox ML193UH045P36B Unit Information page 37

ML193UH with
Coil Using a Common Drain
(1" min. to 2" Max.above
condensate drain connection)
Condensate
Drain Connection
FIGURE 50
Evaporator
Drain Pan
Evaporator
Evaporator drain
line required
ML193UH with Evaporator Coil Using a Common Drain
(Unit shown in horizontal left−hand discharge position)
Coil
Condensat e Drai n
Connection
Piping from furnace and evaporator coil must
slope down a minimum 1/4" per ft. toward trap
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.
4"min
5"max
5' max.
PVC Pipe Only
FIGURE 51
Page 37
IMPORTANT
(4" min. to 5" Max.above
condensate drain connection)