Lennox MERIT ML195UH Installation Instructions Manual page 32

Condensate Trap With Optional Overflow Switch
From Evaporator Coil
HorizontalFurnace4" Min. to 5" Max.above
Optional
FIGURE 48
(Trap at coil is optional)
Drain Pan
Piping from furnace and evaporator coil must slope down a minimum 1/4" per ft. toward trap
condensatedrain connection)
FurnaceCondensate
DrainConnection
Furnace with Evaporator Coil Using a Separate Drain
(Unit shown in horizontal left-hand discharge position)
Evaporator
Coil
Condensate
Drain Connection
Furnace With Evaporator
Coil Using A Separate Drain
(Trap at coil is optional)
Field Provided Vent
(1" min. 2" max. above
condensate connection)
Condensate
Drain Connection
4"min
5"max
5' max.
PVC Pipe Only
FIGURE 50
Page 32
Evaporator drain
line required
FIGURE 49
Field Provided Vent
(4" min. to 5" max. above
condensate connection)
.