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