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4.7 Air Supply and Vent Connections at the Appliance
4.7.1 Vent / Air Pipe Lengths
Water Heater
model
MSTWW199
Table 6.
Maximum Vent / Air Pipe Lengths for either 3" or 2 " Pipes
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˝
4.7.2 Direct Venting
The water heater 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
water heater collar to the vent termination.
(For installations in Canada) field-supplied plastic
vent piping must comply with CAN/CGA B149.1 (latest
edition) and be certified 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 fittings. All plastic
components and specified primers and glues of the
certified vent system must be from a single system
manufacturer and must not be intermixed with another
system manufacturer's parts.
This water heater has a built-in control to limit the
exhaust temperature.
Tightening — Water Heater Collar (Socket) to
Vent Pipe & Inlet Pipe
Canada has adopted standard ULC S636 which
requires the following additional items.
The following steps for cement application are
highlighted:
Clean and dry your selected PVC, CPVC vent
pipe and Laars Water Heater collar (socket).
- Y ou 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 fitting.
3˝ Combustion Air / Vent Pipe
Max
Elbow Max
100´ (30M)
2˝ Combustion Air / Vent Pipe
Max
6
50´ (15M)
3" pipe
2" pipe connected, using an adapter
2" to 3"
adapter
is NOT
included.
LAARS Heating Systems
Elbow Max
4
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