Lennox EL297UH045XV36B Unit Information page 75

Horizontal furnace (FIGURE 50) - In horizontal
furnace applications the field provided vent must
be a minimum 4" to a maximum 5" length above
the condensate drain outlet connection. Any length
above 5" may result in a flooded heat exchanger if
the combined primary drain line were to become
restricted.
NOTE - In horizontal applications it is recommended
to install a secondary drain pan underneath the unit
and trap assembly.
NOTE - Appropriately sized tubing and barbed fitting
may be used for condensate drain. Attach to the
drain on the trap using a hose clamp. See FIGURE
44.
Field Provided Drain Components
Elbow
Tubing
FIGURE 44
CAUTION
Do not use copper tubing or existing copper
condensate 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.
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.
Barbed Fitting
Hose Clamp
CONDENSATE TRAP LOCATIONS
(Unit shown in upflow position with remote trap)
Min. 1" Above Condensate
Trap Can Be Installed a
Maximum 5' From Furnace
*Piping from furnace must slope down a
minimum 1/4" per ft. toward trap
Furnace With Evaporator
Coil Using A Separate Drain
(Trap at coil is optional)
Field Provided Vent
(1" min. 2" max. above
condensate connection)
Condensate
Drain Connection
Page 75
Field ProvidedVent
Drain Connection
1" Min.
2" Max.
*5' max.
PV C PipeOnly
T o Drai n
FIGURE 45
Evaporator drain
line required
FIGURE 46