Lennox EL296DFE Series Manual page 41

1 - Determine which side condensate piping will exit
the unit, location of trap, field-provided fittings and
length of PVC pipe required to reach available drain.
2 - For furnaces with a 1/2" drain connection use a 3/8
allen wrench and remove plug (figure 44) from the
cold end header box at the appropriate location on
the side of the unit. Install field-provided 1/2 NPT
male fitting into cold end header box. For furnaces
with a 3/4" drain connection use a large flat head
screw driver or a 1/2" drive socket extension and
remove plug. Install provided 3/4 NPT street elbow
fitting into cold end header box. Use Teflon tape or
appropriate pipe dope.
3 - Install the cap over the clean out opening at the
base of the trap. Secure with clamp. See figure 50
(3/4" drain connection) or 51 (1/2" drain connection).
4 - Install drain trap using appropriate PVC fittings, glue
all joints. Glue the provided drain trap as shown in
figure 50 or 51. Route the condensate line to an
open drain.
5 - Figure 48 shows the furnace and evaporator coil
using a separate drain. If necessary, the condensate
line from the furnace and evaporator coil can drain
together. See figures 49 and 47. The field provided
vent must be a minimum 1" to a maximum 2" length
above the condensate drain outlet connection.
NOTE - If necessary the condensate trap may be
installed up to 5 feet away from the furnace. Piping
from furnace must slope down a minimum of 1/4"
per ft. toward trap.
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 45.
Field Provided Drain Components
Elbow
Tubing
FIGURE 45
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. Heat 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 LOCATION
(shown with right side exit of condensation)
Trap can be installed a maximum
of 5ft. from furnace (*PVC only)
1" min.
2" max .
*Piping from furnace must slope down a
minimum 1/4" per ft. toward trap
Do not use copper tubing or existing copper
condensate lines for drain line.
Condensate Trap With Optional Overflow Switch
From Evaporator Coil
Optional
Page 41
Field Provided Vent
1" min. 2" max. above
condensate drain.
5' max.
to drain
FIGURE 46
CAUTION
HorizontalFurnace4" Min. to 5" Max.above
condensatedrain connection)
FurnaceCondensate
DrainConnection
FIGURE 47