Lennox ML193UH Installation Instructions Manual page 29

ML193UH DIRECT VENT APPLICATION
USING EXISTING CHIMNEY
8" - 12"
(203mm - 305mm)
Minimum 12" (305MM)
INTAKE PIPE
INSULATION (optional)
above chimney top
plate or average snow
METAL TOP
accumulation
INSULATE
TO FORM
SEAL
*SIZE TERMINATION
PIPE PER TABLE 8.
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
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 44 through 45 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.
STRAIGHT-CUT OR
ANGLE-CUT IN DIRECTION
3"-8"
OF ROOF SLOPE *
(76mm-203mm)
SHOULDER OF FITTINGS
PROVIDE SUPPORT
OF PIPE ON TOP PLATE
SHEET
ALTERNATE
INTAKE PIPE
PLATE
3" - 8"
(76mm-
203mm)
EXTERIOR
PORTION OF
CHIMNEY
12" (305mm)
ABOVE AVE.
SNOW
ACCUMULATION
3" (76mm) OR
2" (51mm) PVC
PROVIDE SUPPORT
FOR EXHAUST LINES
NON-DIRECT VENT ROOF TERMINATION KIT
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.
ML193UH NON-DIRECT VENT APPLICATION
USING EXISTING CHIMNEY
SIZE TERMINATION
PIPE PER TABLE 8.
Minimum 12" (305MM)
above chimney top
plate or average snow
accumulation
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.
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 46 and 48 for condensate trap locations.
Figure 54 shows trap assembly using 1/2" PVC or 3/4"
PVC.
Page 29
SIZE TERMINATION
PIPE PER TABLE 8.
UNCONDITIONED
(15F75 or 44J41)
FIGURE 44
STRAIGHT-CUT OR
ANGLE-CUT IN DIRECTION
OF ROOF SLOPE
SHOULDER OF FITTINGS
PROVIDE SUPPORT
OF PIPE ON TOP PLATE
SHEET
METAL TOP
PLATE
EXTERIOR
PORTION OF
CHIMNEY
FIGURE 45
ATTIC SPACE