Lennox ML193UHE Series User Manual

Page 34
ML193UHE 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 41
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
Minimum 12” (305MM)
above chimney top
plate or average snow
accumulation
8” - 12”
(203mm - 305mm)
3”-8”
(76mm-203mm)
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 15.The specified pipe size ensures proper ve
locity 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.
FIGURE 42
NON-DIRECT VENT ROOF TERMINATION KIT
(15F75 or 44J41)
UNCONDITIONED
ATTIC SPACE
3” (76mm) OR
2” (51mm) PVC
PROVIDE SUPPORT
FOR EXHAUST LINES
12” (305mm)
ABOVE AVE.
SNOW
ACCUMULATION
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 multi
ple furnaces must meet local codes.
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
STRAIGHT-CUT OR
ANGLE-CUT IN DIRECTION
OF ROOF SLOPE
SHOULDER OF FITTINGS
PROVIDE SUPPORT
OF PIPE ON TOP PLATE
EXTERIOR
PORTION OF
CHIMNEY
INSULATE
TO FORM
SEAL
SHEET
METAL TOP
PLATE
ML193UHE NON-DIRECT VENT APPLICATION
USING EXISTING CHIMNEY
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 up flow applications. In horizontal appli
cations, 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.

Lennox ML193UHE Series Specifications

General

Brand	Lennox
Model	ML193UHE Series
Category	Furnace
Language	English