Lennox ML193UHE Series Unit Information page 22

Vent Pipe
Input Size
Dia. in.
1-1.2
6
2
030,
045
2-1/2
3
1-1/2
6
2
070
2-1/2
3
2
090 2-1/2
3
2
110 2-1/2
3
NOTE - Standard Terminations do not include any vent pipe or elbows external to the structure. Any vent pipe or elbows external to the structure must be included in total
vent length calculations. See vent length tables.
* Kits must be properly installed according to kit instructions.
1Requires field-provided outdoor 1-1/2" exhaust accelerator.
2Concentric kits 71M80 and 44W92 include 1-1/2" outdoor accelerator, when uses with 030, 045 and 070 input models. When using 1-1/2 inch vent pipe, transistion to 2"
pipe before installing concentric kit.
3 Flush mount kits 51W11 and 51W12 includes 1-1/2 in. outdoor exhaust accelerator, required when used with 030, 045, 070 and 090 input models. When using 1-1/2"
vent pipe, transition to 2" pipe before installing flushmount kit.
4 Termination kits 30G28, 44W92, 4493 and 81J20 are certified to ULC S636 for use in Canada only.
5 See table 8 for vent accelerator requirements.
6 Requires field provided 2" to 1-1/2" reducer.
Joint Cementing Procedure
All cementing of joints should be done according to the
specifications outlined in ASTM D 2855.
DANGER
DANGER OF EXPLOSION!
Fumes from PVC glue may ignite during system check.
Allow fumes to dissipate for at least 5 minutes before
placing unit into operation..
1 - Measure and cut vent pipe to desired length.
2 - Debur and chamfer end of pipe, removing any
ridges or rough edges. If end is not chamfered,
edge of pipe may remove cement from fitting socket
and result in a leaking joint.
NOTE - Check the inside of vent pipe thoroughly for
any obstruction that may alter furnace operation.
3 - Clean and dry surfaces to be joined.
OUTDOOR TERMINATION USAGE*
STANDARD
Wall Kit
Flush
Mount Kit
2 inch
51W11 22G44
(US) (US)
51W12 30G28
4
(CA) (CA)
YES YES
3
YES YES
3
YES YES
3
YES YES
3
YES YES
3
YES YES
3
YES YES
3
YES YES
3
YES
3
YES
3
YES
3
YES
YES
YES
TABLE 11
3 inch
Field
44J40 (US)
Fabricated
81J20
4
(CA)
YES YES
1 5
YES YES
1 5
YES YES
1 5
YES YES
1 5
YES YES
1 5
YES YES
1 5
YES YES
1 5
YES YES
1 5
YES YES
5
YES YES
5
YES YES
5
YES YES
5
YES YES
5
YES YES
5
4 - Test fit joint and mark depth of fitting on outside of
pipe.
5 - Uniformly apply a liberal coat of PVC primer for
PVC or use a clean dry cloth for ABS to clean inside
socket surface of fitting and male end of pipe to
depth of fitting socket.
NOTE - Time is critical at this stage. Do not allow
primer to dry before applying cement.
6 - Promptly apply solvent cement to end of pipe and
inside socket surface of fitting. Cement should be
applied lightly but uniformly to inside of socket. Take
care to keep excess cement out of socket. Apply
second coat to end of pipe.
7 - Immediately after applying last coat of cement to
pipe, and while both inside socket surface and end
of pipe are wet with cement, forcefully insert end of
pipe into socket until it bottoms out. Turn PVC pipe
1/4 turn during assembly (but not after pipe is fully
inserted) to distribute cement evenly. DO NOT turn
ABS or cellular core pipe
Page 22
CONCENTRIC
1-1.2 inch 2 inch
71M80 69M29
(US) (US)
44W92 44W92
4 4
(CA) (CA)
YES
2
YES
2
YES
2
YES
2
YES
2
YES
2
YES
2
YES
2
YES
YES
YES
YES
YES
YES
3 inch
60L46 (US)
44W93
4
(CA)
YES
YES
YES
YES
YES
YES