LAARS Mighty Max HH (Sizes 320M - 400M) - Installation, Operation and Maintenance Instructions - Manual (Page 13)

Mighty Max Hydronic Boiler Page 13
IMPORTANT: Maximum pipe length allowed is 50 feet (15m), regardless of the number of elbows. Maximum number of elbows allowed is 5.
Vent pipe minimum clearance from combustible surfaces is 6 inches (152mm).
Table 7. Vent Piping Specifications (Combustion Air Exhaust).
1. Remove the adapter plate from the top panel.
2. On the boiler jacket, remove the top panel and
ease its lip from under the edge of the bonnet to
gain access to the flue collector.
3. Remove the vent collar/stack from the flue
collector. Do not damage the vent collar/stack
during removal.
4. Remove the blank plate from the rear of the
jacket.
5. Remove the blank plate from the rear section of
the flue collector. Be careful not to lose the
insulation attached to the plate.
6. Apply high temperature sealant and install the
blank plate (previously removed from the rear
section of the flue collector) on top of the flue
collector.
7. Install the blank plate (previously removed from
the rear of the boiler jacket) over the stack
opening on the top panel of the boiler.
8. Apply high temperature sealant (see Table 6) to
vent collar/stack and install on the rear of the
flue collector.
Term Description
Pipe Must comply with UL Standard 1738
such as type 29-4C stainless steel
Joint Sealing Follow vent manufacturer's
instructions
Insulation Recommended, but not required,
minimum R5 with protective cover
Table 6. Required Horizontal Venting Material.
9. Slip the adapter plate over the vent collar/stack
and install it onto the rear boiler jacket (see
Figure 9).
2.12Venting
Venting must be in accordance with these
instructions and applicable requirements of the latest
edition of ANSI Z223.1/NFPA 54. In Canada,
installation must be in accordance with the latest
edition of CSA B149.1, and applicable local codes.
2.12.1 Vertical Venting - Category I
The Mighty Max boiler has a fan-assisted
combustion system, so vertical vents must be installed
in accordance with the special code requirements for
Category I - Fan-Assisted Appliances. These
requirements can be found in the latest edition of
ANSI Z223.1/NFPA 54, Appendix G, Table 1, and in
Canada, CSA B149.1, Amendment No. 1. These codes
permit installation as a single appliance or in
combination with other Category I appliances.
However, there are very important requirements for
minimum and maximum vent diameter and length.
Make sure vertically-vented installations comply with
these codes.
NOTE: If a vent cannot be installed in accordance
with the requirements of these codes, it must be
installed as a horizontal vent, even if it is mainly
vertical.
2.12.2 Vertical Venting - Non-Category I
When venting does not meet the code
requirements for Category I - Fan-Assisted Vertical
Vents, it can develop positive pressure. Such venting
must be installed in accordance with this section or
Section 2.12.3.
The following requirements must be used for
Non-Category I venting:
1.
Laars specified vent pipe material (Table 6) and
sizes (Table 7).
2. Pipe insulation and sealing tape.
3. Routing vent pipe through spaces which, except
for the terminal, remain above 60°F (16°C)
during heater operation.
2.12.3 Horizontal Venting - Non-Category I
When venting is horizontal, or cannot meet the
code requirements for Category I - Fan-Assisted
Vertical Vents, it can develop positive pressure and
must be installed in accordance with this section.
The following requirements must be used for
Horizontal Venting - Non-Category I:
1.
Laars specified vent pipe material (Table 6) and
sizes (Table 7).
2. Laars side wall vent hood.
3. Pipe insulation and sealing tape.
Heater Pipe Diameter Max Pipe Length Max No.
Side Wall Side Wall
Size of Elbows
Vent Terminal Combustion Air
in. mm in. mm Part Number Terminal Part Number
320M 6 152 50 15 5 D2004500 20260701
400M 7 178 50 15 5 D2004600 20260702
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