Lennox ML193UH Installation Instructions Manual page 32

(Trap at coil is optional)
Drain Pan
ML193UH with
Coil Using a Common Drain
(Trap at coil is optional)
(1" min. to 2" Max.above
condensate drain connection)
Condensate
Drain Connection
FIGURE 52
(Trap at coil is optional)
Drain Pan
ML193UH with Evaporator Coil Using a Separate Drain
(Unit shown in horizontal left-hand discharge position)
Evaporator
Coil
Condensate
Drain Connection
*Piping from furnace and evaporator coil must
slope down a minimum 1/4" per ft. toward trap
Evaporator
Evaporator drain
line required
ML193UH with Evaporator Coil Using a Common Drain
(Unit shown in horizontal left−hand discharge position)
Evaporator
Coil
Condensate
Drain Connection
*Piping from furnace and evaporator coil must
slope down a minimum 1/4" per ft. toward trap
4"min
5"max
5' max.
PVC Pipe Only
FIGURE 51
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 53
Page 32
Field Provided Vent
(4" min. to 5" max. above
condensate connection)
.
IMPORTAN­
T
(4" min. to 5" Max.above
condensate drain connection)