Lennox ML296UHV Series Unit Information

Page 39
Condensate Piping
This unit is designed for either right- or left-side exit of
condensate piping in upow 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 41 and FIGURE 43 for con-
densate 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, 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 (FIGURE 41)
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 factory
installed. Check the unused plug for tightness to
prevent leakage.
3 - I nstall 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 ttings,
glue all joints. Glue the provided drain trap as
shown in FIGURE 49. 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 44 and FIGURE 45 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 46, FIGURE 47
and FIGURE 48. Upow furnace (FIGURE 47) - 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.
6 - If unit will be started immediately upon completion
of installation, prime trap per procedure outlined in
Unit Start-Up section.
Horizontal furnace (FIGURE 48) - In horizontal fur-
nace applications the eld provided vent must be a
minimum 4” to a maximum 5” length above the con-
densate drain outlet connection. Any length above 5”
may result in a ooded heat exchanger if the combined
primary drain line were to become restricted.
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.
Rubber
Grommet
FIGURE 41
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 tting
may be used for condensate drain. Attach to the
drain on the trap using a hose clamp. See FIGURE
42.
Field Provided Drain Components
T
ubing
Hose Clamp
Barbed Fitting
Elbow
FIGURE 42
CAUTION
Do not use copper tubing or existing copper condensate
lines for drain line.

Lennox ML296UHV Series Specifications

General

Brand	Lennox
Model	ML296UHV Series
Category	Furnace
Language	English