Lennox EL296UHV Installation Instructions Manual page 31

Details of Exhaust Piping Terminations for Non‐Direct
Vent Applications
Exhaust pipes may be routed either horizontally through an
outside wall or vertically through the roof. In attic or closet
installations, vertical termination through the roof is pre­
ferred. Figures 42 through 43 show typical terminations.
1 - Exhaust piping must terminate straight out or up as
shown. The termination pipe must be sized as listed in
table 8.The specified pipe size ensures proper veloc­
ity required to move the exhaust gases away from the
building.
2 - On field supplied terminations for side wall exit, ex­
haust piping may extend a maximum of 12 inches
(305MM) for 2" PVC and 20 inches (508MM) for 3"
(76MM) PVC beyond the outside wall.
12" (305MM)
ABOVE AVE.
SNOW
ACCUMULATION
3" (76MM) OR
2" (51MM) PVC
PROVIDE SUPPORT
FOR EXHAUST LINES
NON-DIRECT VENT ROOF TERMINATION KIT
(15F75 or 44J41)
FIGURE 42
3 - If exhaust piping must be run up a side wall to position
above snow accumulation or other obstructions, pip­
ing must be supported every 24 inches (610MM).
When exhaust piping must be run up an outside wall,
any reduction in exhaust pipe size must be done after
the final elbow.
4 - Distance between exhaust pipe terminations on mul­
tiple furnaces must meet local codes.
SIZE TERMINATION
PIPE PER TABLE 8.
UNCONDITIONED
ATTIC SPACE
Page 31
EL296UHV NON-DIRECT VENT APPLICATION
USING EXISTING CHIMNEY
SIZE TERMINATION
PIPE PER TABLE 8.
Minimum 12" (305MM)
above chimney top
plate or average snow
accumulation
SHEET
METAL TOP
PLATE
INSULATE
TO FORM
SEAL
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 43
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 figures 44 and 46 for condensate trap locations.
Figure 52 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, field-provided fittings and length
of PVC pipe required to reach available drain.
2 - Use a large flat head screw driver or a 1/2" drive socket
extension and remove plug (figure 44) from the cold
end header box at the appropriate location on the side
of the unit. Install provided 3/4 NPT street elbow fitting
into cold end header box. Use Teflon tape or appropri­
ate pipe dope.
3 - Install the cap over the clean out opening at the base
of the trap. Secure with clamp. See figure 52.
STRAIGHT-CUT OR
ANGLE-CUT IN DIRECTION
OF ROOF SLOPE
SHOULDER OF FITTINGS
PROVIDE SUPPORT
OF PIPE ON TOP PLATE
EXTERIOR
PORTION OF
CHIMNEY