Lennox EL296UHV Installation Instructions Manual 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.
EL296UHV with Evaporator Coil Using a Common Drain
Evaporator
Coil
Drain Pan
(Trap at coil is optional)
Piping from furnace and evaporator coil must slope down a minimum 1/4" per ft. toward trap
(Unit shown in horizontal left−hand discharge position)
PVC Pipe Only
Condensat e Drai n
Connection
FIGURE 51
Page 34
EL296UHV with Evaporator
Coil Using a Common Drain
(Trap at coil is optional)
(1" min. to 2" Max.above
condensatedrain connection)
Condensate
Drain Connection
4"min
5"max
5' max.
Evaporator drain
line required
FIGURE 50
(4" min. to 5" Max.above
condensatedrain connection)