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NOTE -
Cold end header box drain plugs are factory
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
50 (3/4” drain connection) or FIGURE 52 (1/2” drain
connection
4 - Install drain trap using appropriate PVC fittings, glue
all joints. Glue the provided drain trap as shown in
FIGURE 50 or FIGURE 51. Route the condensate
line to an open drain.
5 - FIGURE 48 shows 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 49. 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
.
Field Provided Drain Components
Tubing
Hose Clamp
Barbed Fitting
Elbow
FIGURE 47
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 available
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.
Furnace with Evaporator Coil
Using a Separate Drain
Drain
Field Provided Vent
1” min. 2” max. above
condensate drain.
Condensate
Drain Connection
Evaporator Drain Line
(vent required)
FIGURE 48
IMPORTANT
When combining the furnace and evaporator coil
drains together, the A/C condensate drain outlet
must be vented to relieve pressure in order for the
furnace pressure switch to operate properly.
IMPORTANT
Do not use copper tubing or existing copper
condensate lines for drain line.
Furnace with Evaporator
Coil Using a Common Drain
Field Provided Vent
1” min. 2” max. above
condensate drain.
Evaporator Drain Line
(vent required)
Condensate
Drain Connection
FIGURE 49
