Lennox EL195UHNE Series Manual page 34

male fitting into cold end header box. For furnaces
with a 3/4" Page 34 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.
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 51.
4 - Install drain trap using appropriate PVC fittings,
glue all joints. Glue the provided drain trap as
shown in figure 51. 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 43
5 - Figures 46 and 48 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 47, 49 and
50. Upflow furnace (figure 49) - 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 50) - 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.
Plug
(same on left side)
Page 34
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 44.
Field Provided Drain Components
Elbow
Tubing
FIGURE 44
IMPORTANT
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.
CONDENSATE TRAP LOCATIONS
(Unit shown in upflow position with remote trap)
FieldProvidedVent
Min. 1" Above Condensate
Drain Connection
1" Min.
2" Max.
PV C PipeOnly
Trap Can Be Installed a
Maximum 5' From Furnace
*Piping from furnace must slope down a
minimum 1/4" per ft. toward trap
FIGURE 45
Barbed Fitting
Hose Clamp
*5' max.
T o Drai n