Lennox EL195UHNE Series

Page 31
Refer to gures 47 and 49 for condensate trap locations.
Figure 55 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, eld-provided ttings and
length of PVC pipe required to reach available drain.
2 - Use a large at head screw driver or a 1/2” drive
socket extension and remove plug (gure 47) from
the cold end header box at the appropriate location
on the side of the unit. Install provided 3/4 NPT street
elbow tting into cold end header box. Use Teon
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 gure 55.
CONDENSATE TRAP AND PLUG LOCATIONS
(Unit shown in upflow position)
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.
Trap
(same on
right side)
Plug
(same on left side)
1-1/2 in.
Figure 47
4 - Install drain trap using appropriate PVC ttings, glue
all joints. Glue the provided drain trap as shown in
gure 55. Route the condensate line to an open drain.
Condensate line must maintain a 1/4” downward
slope from the furnace to the drain.
5 - Figures 50 and 52 show the furnace and evaporator oil
using a separate drain. If necessary the condensate
line from the furnace and evaporator coil can drain
together. See gures 51, 53 and 54. Upow furnace
(gure 53) - In upow furnace applications the eld
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 ooded heat
exchanger if the combined primary drain line were
to become restricted. Horizontal furnace (gure 54)
- In horizontal furnace applications the eld 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 ooded 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 t-
ting may be used for condensate drain. Attach to the
drain on the trap using a hose clamp. See gure 48.
IMPORTANT
Do not use copper tubing or existing copper condensate
lines for drain line.
Field Provided Drain Components
Tubing
Hose Clamp
Barbed Fitting
Elbow
Figure 48
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 down-
ward 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 con-
ditioned 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.