Page 76
Horizontal furnace (FIGURE 50) - In horizontal fur-
nace applications the eld provided vent must be a
minimum 4” to a maximum 5” length above the con-
densate drain outlet connection. Any length above 5”
may result in a ooded 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 tting
may be used for condensate drain. Attach to the
drain on the trap using a hose clamp. See FIGURE
44.
Field Provided Drain Components
Tubing
Hose Clamp
Barbed Fitting
Elbow
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 con-
ditioned 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.
(Unit shownin upflow position withremote trap)
*5’ max.
To Drain
PVCPipeOnly
FieldProvidedVent
Min.1” Above Condensate
Drain
Connection
1”
Min.
Trap CanBeInstalleda
Maximum 5’ From Furnac
e
2” Max.
CONDENSATE TRAP LOCATIONS
*Piping from furnace must slope down a
minimum 1/4” per ft. toward trap
FIGURE 45
Furnace With Evaporator
Coil Using A Separate Drain
Condensate
Drain
Connection
Field Provided Vent
(1” min. 2” max. above
condensate connection)
Evaporator drain
line required
(Trap at coil is optional)
FIGURE 46
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