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SLP98 DIRECT VENT APPLICATION
USING EXISTING CHIMNEY
NOTE − Do not discharge exhaust gases directly into any chimney or vent stack. If ver-
tical discharge through an existing unused chimney or stack is required, insert piping
inside chimney until the pipe open end is above top of chimney and terminate as illus-
trated. In any exterior portion of chimney, the exhaust vent must be insulated.
FIGURE 38
8" − 12"
(203mm − 305mm)
3" − 8"
(76mm−
203mm)
3" − 8"
(76mm−
203mm)
STRAIGHT−CUT OR
ANGLE−CUT IN DIRECTION
OF ROOF SLOPE *
EXHAUST VENT
1/2" (13mm)
WEATHERPROOF
INSULATION
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 24.
Minimum 12" (305MM)
above chimney top
plate or average snow
accumulation
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 39 for condensate trap locations.
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.
FIGURE 39
CONDENSATE TRAP AND PLUG LOCATIONS
(Unit shown in upflow position)
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 relocated to
avoid interference.
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 − Remove plug (figure 39) 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. Use teflon tape or appropriate pipe dope.
3 − Install drain trap using appropriate PVC fittings, glue all
joints. Glue the provided drain trap as shown in figure
41. Route the condensate line to an open drain.
4 − If unit will be started immediately upon completion of
installation, prime trap per procedure outlined in Unit
Start−Up section.
FIGURE 40
CONDENSATE TRAP LOCATIONS
(Unit shown in upflow position with remote trap)
*5’ max.
To Drain
PVC Pipe Only
Field Provided Vent
Min. 1" Above Condensate
Drain Connection
1" Min.
Trap Can Be Installed a
Maximum 5’ From Furnace
*Piping from furnace must slope down a minimum
of 1/4" per ft. toward trap.
Condensate line must be sloped downward away from
condensate trap to drain. If drain level is above con-
densate trap, condensate pump must be used. Con-
densate drain line should be routed within the condi-
tioned 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.
Heating 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.
CAUTION
Do
not use copper tubing or existing copper con-
densate lines for drain line.
