Page 40
CAUTION
Do not use copper tubing or existing copper conden
sate lines for drain line.
6 - If unit will be started immediately upon completion of
installation, prime trap per procedure outlined in Unit
Start-Up section.
FIGURE 42
(Unit shown in upflow position with remote trap)
*5’ max.
To Drain
PVCPipeOnly
FieldProvidedVent
Min. 1” AboveCondensate
Drain
Connection
1”
Min.
2” Max.
CONDENSATE TRAP LOCATIONS
Trap can be installed a
maximum 5' from furnace
*Piping from furnace must slope down a minimum of
1/4” per ft. toward trap.
Condensate line must slope downward away from the
trap to drain. If drain level is above condensate trap,
condensate pump must be used. Condensate drain
line should be routed within the conditioned space to
avoid freezing of condensate and blockage of drain
line. If this is not possible, a heat cable kit may be used
on the condensate trap and line. Heating cable kit is
available from Lennox in various lengths; 6 ft. (1.8m) -
kit no. 26K68; 24 ft. (7.3m) - kit no. 26K69; and 50 ft.
(15.2m) - kit no. 26K70.
FIGURE 43
ML296UHV With Evaporator
Coil Using A Separate Drain
Condensate
DrainConnection
Field Provided Vent
(1” min. 2” max. above
condensate connection)
Evaporator drain
line required
(Trap at coil is optional)
FIGURE 44
ML296UHV with Evaporatoir Coil Using a Separate Drain
(Unit shown in horizontal left-hand discharge position)
.
5’ max.
PVC Pipe Only
4”min
5”max
Evaporator
Coil
Drain
Pan
Condensate
DrainConnection
Field Provided Vent
(4” min. to 5” max. above
condensate connection)
Piping from furnace and evaporator coil must slope down a minimum 1/4” per ft. toward trap
(Trap at coil is optional)
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.
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