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SLP98 DIRECT VENT APPLICATION
USING EXISTING CHIMNEY
NOTE - Do
tical discharge through an existing unused chimney or stack is required, insert piping
inside
trated. In any exterior portion of chimney, the exhaust vent must be insulated.
8” - 12”
(203mm - 305mm)
3” - 8”
(76mm-
203mm)
3” - 8”
(76mm-
203mm)
STRAIGHT-CUT OR
ANGLE-CUT IN DIRECTION
OF ROOF SLOPE *
SHOULDER OF FITTINGS
PROVIDE SUPPORT
OF PIPE ON TOP PLATE
ALTERNATE
INTAKE PIPE
INTAKE PIPE
INSULATION (optional)
EXTERIOR
PORTION OF
CHIMNEY
INSULATE
TO FORM
SEAL
SHEET
METAL TOP
PLATE
*SIZE TERMINATION
PIPE PER TABLE 9.
Minimum 12” (305MM)
above chimney top
plate or average snow
accumulation
FIGURE 39
Condensate Piping
This unit is designed for either right- or left-side exit of
condensate piping. Refer to FIGURE 40 and FIGURE 42
for condensate trap locations.
CONDENSATE TRAP AND PLUG LOCATIONS
Trap
(same on
right side)
Plug
(same on left
side)
1-1/2 in.
FIGURE 40
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
allen 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 FIGURE
4 -
Install drain trap using appropriate PVC fittings, glue
all joints. Glue the provided drain trap as shown in
FIGURE 46. Route the condensate line to an open
drain.
5 - FIGURE 43 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 44 and FIGURE 45.
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 41
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 and 24 ft. (7.3m) - kit no. 26K69.
