Laars MFTHW199 - Air Supply and Vent Connections at the Appliance; Vent; Air Pipe Lengths; Direct Venting

Mascot FT, Heating Only, Boiler
Page 25
4.7 Air Supply and Vent Connections at the Appliance
4.7.2 Direct Venting
The boiler uses 3˝ or 2˝ diameter exhaust and 3˝
or 2˝diameter intake air ducts. To ensure the draw
of air directly from and exhaust of air directly to the
outside of the building, create an airtight seal from
the boiler collar to the vent termination.
(For installations in Canada) eld-supplied plastic
vent piping must comply with CAN/CSA B149.1
(latest edition) and be certied by the Standard
For Type BH Gas Venting Systems, ULC-S636.
Components of this listed system must not be
interchanged with other vent systems or unlisted
pipes or ttings. All plastic components and
specied primers and glues of the certied vent
system must be from a single system manufacturer
and must not be intermixed with another system
manufacturer’s parts.
Tightening — Boiler Collar (Socket) to Vent
Pipe & Inlet Pipe
- Clean and dry your selected PVC, CPVC vent
pipe and Laars Boiler collar (socket).
- You can select to the size of vent pipe(2˝ & 3˝),
according to the installation conditions.
- Push the pipe into the collar (socket) until it
touches the bottom of the socket tting.
- For 2” installations, install a eld supplied 3” to
2” adaptor. Adaptor must be installed in vertical
section of piping only.
Boiler model
3˝ Combustion Air / Vent Pipe 2˝ Combustion Air / Vent Pipe
Max Elbow Max Max Elbow Max
MFTHW (all sizes) 100´ (30M) 6
50´
*
(15M
*
)
4
Table6. MaximumVent/AirPipeLengthsforeither3”or2“Pipes
2”pipeconnected,usinganadapter
3” to 2”
adapter
is NOT
included.
3” pipe
4.7.1Vent/AirPipeLengths
NOTE: For additional elbows, reduce maximum allowable length
• 5 feet (1.5M) for each additional 3-inch 90-degree elbow
• 2.5 feet (0.75M) for each additional 3-inch 45-degree elbow
• 5 feet (1.5M) for each additional 2-inch 90-degree elbow
• 4 feet (1.2M) for each additional 2-inch 45-degree elbow
 •Thethicknessofthewallventsinstalled:Min4˝~Max20˝
*
Propane models are limited to 25 equivalent feet of 2” vent
NOTE: The Mascot FT is factory set to
operate using 3” piping for Intake and
Vent. For 3” Pipe vent, the default setting
for DIP 4 is ON. If your installation is
using a 2” vent pipe, DIP Switch 4 must
be in the OFF position.
Refer to Section 4:18