Page 13
M
INI-
T
HERM
JX
Residential Boilers
®
WALL OR
PARAPET
CHIMNEY
CHIMNEY
RIDGE
WALL OR
PARAPET
CHIMNEY
CHIMNEY
RIDGE
10 (3.0) OR
LESS
Figure 6. Vertical Vent Termination.
2 (0.6) MIN.
3 (0.9)
MIN.
10 (3.0)
OR LESS
2 (0.6)
MIN.
3 (0.9)
MIN.
3 (0.9)
MIN.
3 (0.9)
MIN.
2 (0.6)
MIN.
10 (3.0)
MORE THAN 10
(3.0)
MORE THAN 10
(3.0)
NOTE: NO HEIGHT
ABOVE PARAPET
REQUIRED WHEN
FROM WALLS OR
PARAPET IS MORE
THAN 10 FT. (3.0m)
TERMINATION
10 FT. (3.0m)
OR LESS FROM RIDGE,
WALL OR PARAPET
Dimensions in feet (m).
3.C Venting
Vent Category: This boiler is a natural draft
appliance for Category I venting. It may also be vented
using a power vent. Follow the instructions provided
with the power venter. See 3.F for more information.
NOTE
: When venting a Category I boiler, the
vent damper must be fastened directly to the vent
collar, and vent pipe must be fastened directly to
the vent damper.
The installation must also conform to the requirements
of applicable local codes, or in the absence of such
codes, to the National Fuel Gas Code, ANSI Z223.1
and the National Electric Code, ANSI NFPA 70, or in
Canada, CAN/CGA B149.1 (a vent damper may not
be required in all Canadian jurisdictions) and B149.2
Installation Codes and the requirement of CSA C22.1,
Part 1.
Do not weld the vent pipe to the boiler collar.
The weight of the stack must not rest on the boiler.
The boiler top is designed so that it can be easily
removed for normal boiler service and inspection
without removal of the venting.
Avoid terminating boiler vents near air conditioning
or air supply fans. The fans can pick up exhaust
flue products from the boiler and return them to the
building, creating a possible health hazard.
Avoid oversized vent pipe or extremely long runs
of vent pipe, which may cause excessive cooling and
condensation.
When installing the vent system, all applicable
national and local codes must be followed! The use
of thimbles, firestops and other protective devices,
when penetrating combustible or noncombustible
construction, must be in accordance with all applicable
national and local codes.
An unused lined chimney can be used as a
raceway for single wall vent pipe. Never run vent pipe
through a flue that has another appliance attached to
it.
NOTE:
The minimum return water temperature of
the unit, in order to avoid condensation in the vent,
is 130°F. The unit's control is equipped to protect
against low temperatures, however the pumps must
be installed and wired properly for this feature to
function. The system pumps must be wired to the
system pump terminals, and a boiler pump must
be installed and wired to the boiler pump terminal
(models 125 - 200 are built with LLH/ boiler pump
systems that are wired at the factory). See Figure
21 on page 27. If the system is not setup this
way, condensation may occur which could damage
venting systems.
