Lennox MERIT ML193UH Installation Instructions Manual page 33

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.
CONDENSATE TRAP LOCATIONS
(Unit shown in upflow position with remote trap)
Field Provided Vent
Min. 1" Above Condensate
Drain Connection
1" Min.
2" Max.
*5' max.
PVC Pipe Only
Trap Can Be Installed a
Maximum 5' From Furnace
*Piping from furnace must slope down a minimum
of 1/4" per ft. toward trap.
FIGURE 54
Drain Pan
*Piping from furnace and evaporator coil must slope down a minimum of 1/4" per ft. toward trap.
To Drain
ML193UH with Evaporatoir Coil Using a Separate Drain
(Unit shown in horizontal left−hand discharge position)
Evaporator
Coil
Condensate Drain
Connection
FIGURE 56
Page 33
ML193UH With Evaporator
Coil Using A Separate Drain
Field−Provided Vent
(1" min. to 2" Max. above
condensate drain connection)
Condensate
Drain Connection
FIGURE 55
4"min
5"max
5' max.
PVC Pipe Only
Condensate trap
and evaporator coil
drain separately as
shown.
Drain
Field−Provided Vent
(4" min. to 5" Max. above
condensate drain connection)