Lennox ELITE Series Installation Instructions Manual page 31

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 - Use a large flat head screw driver or a 1/2" drive
socket extension and remove plug (FIGURE 46)
from the cold end header box at the appropriate
location on the side of the unit. Install provided 3/4
NPT street elbow fitting into cold end header box.
Use Teflon tape or appropriate pipe dope.
NOTE - Cold end header box drain plugs are facto-
ry installed. Check the unused plug for tightness to
prevent leakage.
3 - I nstall the cap over the clean out opening at the base
of the trap. Secure with clamp. See FIGURE 54.
4 - Install drain trap using appropriate PVC fittings, glue
all joints. Glue the provided drain trap as shown
in FIGURE 54. Route the condensate line to an
open drain. Condensate line must maintain a 1/4"
downward slope from the furnace to the drain.
CONDENSATE TRAP AND PLUG LOCATIONS
(Unit shown in upflow position)
Trap
(same on
right side)
1-1/2 in.
NOTE - In upflow applications where side return
sate trap, filter rack must be installed beyond
condensate trap or trap must be re-located to
avoid interference.
FIGURE 46
5 - FIGURE 50 and FIGURE 51 show 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, FIGURE
52( upflow furnace) and FIGURE 53.
Rubber
Grommet
Plug
(same on left side)
Page 31
- In upflow furnace applications the field provided vent
must be a minimum 1" to a maximum 2" length above
the condensate drain outlet connection. Any length
above 2" may result in a flooded heat exchanger if the
combined primary drain line were to become restricted.
Horizontal furnace (figure 53) - 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 fit-
ting 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
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 and 24 ft. (7.3m) - kit no. 26K69.
Barbed Fitting
Hose Clamp