Lennox EL195UHE Installation Instructions Manual page 32

Refer to figures 45 and 47 for condensate trap locations.
Figure 53 shows trap assembly using 1/2" PVC or 3/4"
PVC.
NOTE - If necessary the condensate trap may be installed
up to 5' away from the furnace. Use PVC pipe to connect
trap to furnace condensate outlet. Piping from furnace
must slope down a minimum of 1/4" per ft. toward trap.
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 45) 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 - Install the cap over the clean out opening at the base
of the trap. Secure with clamp. See figure 53.
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 45
4 - Install drain trap using appropriate PVC fittings, glue
all joints. Glue the provided drain trap as shown in
figure 53. Route the condensate line to an open drain.
Condensate line must maintain a 1/4" downward
slope from the furnace to the drain.
Plug
(same on left side)
Page 32
5 - Figures 48 and 50 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 figures 49, 51 and 52. Upflow
furnace (figure 51) - 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 52) - 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 46.
CAUTION
Do not use copper tubing or existing copper condensate
lines for drain line.
Field Provided Drain Components
Elbow
Tubing
FIGURE 46
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, conden-
sate 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