Lennox EL296UH045XV36B Installation Instructions Manual page 32

Condensate Piping
This unit is designed for either right- or left-side exit of
condensate piping in upflow applications. In horizontal
applications, the condensate trap must extend below the
unit. An 8" service clearance is required for the conden-
sate trap. Refer to Figure 45 and Figure 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.
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.
5 - Figure 48 and Figure 49 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 50, Figure 51 and
Figure 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.
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.
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 46.
Field Provided Drain Components
Elbow
Tubing
Do not use copper tubing or existing copper condensate
lines for drain line.
Page 32
Rubber
Grommet
Plug
(same on left side)
Figure 45
Barbed Fitting
Hose Clamp
Figure 46
CAUTION