Page 75
Horizontal furnace (FIGURE 50) - In horizontal
furnace applications the eld 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 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
T
ubing
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 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.
(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
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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