Lennox EL196UHE Series Information page 38

NOTE - Cold end header box drain plugs are factory
installed. Check the unused plug for tightness to
prevent leakage.
3 - Install 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 49 and FIGURE 51 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 50, FIGURE 52
and FIGURE 53.
Upflow furnace (FIGURE 52) - 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.
Plug
(same on left side)
Page 38
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 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
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