Lennox EL297DFV Series Unit Information page 58

3 - Install the cap over the clean out opening at the
base of the trap. Secure with clamp. See FIGURE
50.
4 - Install drain trap using appropriate PVC fittings, glue
all joints. Glue the provided drain trap as shown in
FIGURE 50. 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 FIGURE 49. 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.
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.
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
47.
Field Provided Drain Components
Elbow
Tubing
FIGURE 47
Barbed Fitting
Hose Clamp
Furnace with Evaporator Coil
Field Provided Vent
1" min. 2" max. above
condensate drain.
Condensate
Drain Connection
Evaporator Drain Line
(vent required)
Furnace with Evaporator
Coil Using a Common Drain
Field Provided Vent
1" min. 2" max. above
condensate drain.
Condensate
Drain Connection
Evaporator Drain Line
(vent required)
When combining the furnace and evaporator coil
drains together, the A/C condensate drain outlet must
be vented to relieve pressure in order for the furnace
pressure switch to operate properly.
Do not use copper tubing or existing copper condensate
lines for drain line.
Page 58
Using a Separate Drain
FIGURE 48
FIGURE 49
IMPORTANT
CAUTION
Drain