Page 34
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 57
Condensate Trap With Optional Overflow Switch
Field−Provided Vent
(Upflow/Furnace 1" Min. to 2" Max.
Horizontal Furnace 4" Min. to 5" Max. above
condensate drain connection)
Furnace Condensate
Drain Connection
From Evaporator Coil
To Drain
Optional
Overflow Switch
FIGURE 58
ML193UH with Evaporator
Coil Using a Common Drain
Field−Provided Vent
(1" min. to 2" Max. above
condensate drain connection)
Evaporator
Drain Line
Vent Required
Condensate
Drain Connection
FIGURE 59
Condensate Drain
Connection
ML193UH with Evaporator Coil Using a Common Drain
(Unit shown in horizontal left−hand discharge position)
Field−Provided Vent
(4" min. to 5" Max. above
condensate drain connection)
*Piping from furnace and evaporator coil must slope down a minimum of 1/4" per ft. toward trap.
5’ max.
PVC Pipe Only
4”min
5”max
Evaporator
Coil
Drain Pan
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