Page 33
Condensate Piping
This unit is designed for either right‐ or left‐side exit of con
densate piping. Refer to figures 40 and 42 for condensate
trap locations.
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.
FIGURE 40
CONDENSATE TRAP AND PLUG LOCATIONS
Trap
(same on
right side)
Plug
(same on left
side)
1-1/2 in.
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 - For furnaces with a 1/2” drain connection use a 3/8 al
len wrench and remove plug (figure 40) from the cold
end header box at the appropriate location on the side
of the unit. Install field-provided 1/2 NPT male fitting
into cold end header box. For furnaces with a 3/4”
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.
3 - Install the cap over the clean out opening at the base
of the trap. Secure with clamp. See figures 46 and 47.
4 - Install drain trap using appropriate PVC fittings, glue
all joints. Glue the provided drain trap as shown in fig
ures 46 and 47. Route the condensate line to an open
drain.
5 - Figure 44 shows the furnace and evaporator coil using
a separate drain. If necessary, the condensate line
from the furnace and evaporator coil can drain togeth
er. See figures 45 and 43. The field provided vent must
be a minimum 1” to a maximum 2” length above the
condensate drain outlet connection.
NOTE
- If necessary the condensate trap may be installed
up to 5 feet away from the furnace. Piping from furnace
must slope down a minimum of 1/4” per ft. toward trap.
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 41.
FIGURE 41
Tubing
Hose Clamp
Barbed Fitting
Field Provided Drain Components
Elbow
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. Heat cable kit is avail
able from Lennox in various lengths; 6 ft. (1.8m) - kit
no. 26K68; 24 ft. (7.3m) - kit no. 26K69; and 50 ft.
(15.2m) - kit no. 26K70.
CAUTION
Do
not use copper tubing or existing copper
condensate lines for drain line.
