Condensate Piping; Condensate Trap And Plug Locations; Field Provided Drain Components - Lennox EL296UH045XE36B Unit Information

Condensate Piping

This unit is designed for either right‐ or left‐side exit of con­
densate piping in upflow applications. In horizontal applica­
tions, the condensate trap must extend below the unit. An
8" service clearance is required for the condensate trap.
Refer to figure 41 for condensate trap locations. Figure 49
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. Install provided 3/4 NPT
street elbow fitting into cold end header box. Use Tef­
lon tape or appropriate pipe dope.
3 - Install the cap over the clean out opening at the base
of the trap. Secure with clamp. See figure 49.
4 - Install drain trap using appropriate PVC fittings, glue
all joints. Glue the provided drain trap as shown in fig­
ures 49. 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
air filter is installed on same side as the conden­
sate trap, filter rack must be installed beyond
condensate trap or trap must be re-located to
avoid interference.
FIGURE 41
Plug
(same on left side)
Page 40
5 - Figures 44 and 46 show the furnace and evaporator
coil using a separate drain. If necessary the conden­
sate line from the furnace and evaporator coil can
drain together. See figures, 45, 47 and 48.
Upflow furnace (figure 47) - In upflow furnace applica­
tions 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 48) - In horizontal furnace
applications the field provided vent must be a mini­
mum 4" to a maximum 5" length above the condensate
drain outlet connection. Any length above 5" may re­
sult in a flooded heat exchanger if the combined pri­
mary 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 42.

Field Provided Drain Components

Elbow
Tubing
FIGURE 42
CAUTION
Do not use copper tubing or existing copper conden­
sate 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
Barbed Fitting
Hose Clamp