Connections
13
Venting Connection
Safety inspection of existing
venting system
When existing boiler is removed from a
common venting system, the common
venting is likely to be too large for
proper venting of the appliances
remaining connected to it.
At the time of removal of an existing
boiler, the following steps shall be
followed with each appliance remaining
connected to the common venting
system placed in operation, while the
other appliances remaining connected
to the common venting system are not
in operation:
H
Seal any unused openings in the
common venting system.
H
Visually inspect the venting system
for proper size and horizontal pitch
and determine there is no blockage or
restriction, leakage, corrosion, or any
other deficiency which could cause an
unsafe condition.
H
Insofar as is practical, close all
building doors and windows, and all
doors between the space in which the
appliances remain connected to the
common venting system, and other
spaces of the building. Turn on any
exhaust fans, such as range hoods
and bathroom exhausts, so they will
operate at maximum speed. Do not
operate a summer exhaust fan. Close
fireplace dampers.
H
Place in operation the appliance being
inspected. Follow the Lighting and
Operating Instructions. Adjust
thermostat so appliance will operate
continuously.
H
Test for spillage at the draft hood
relief opening after 5 minutes of main
burner operation. Use the flame of a
match or a candle.
H
After it has been determined that
each appliance remaining connected
to the common venting system
properly vents when tested as
outlined above, return doors,
windows, exhaust fans, fireplace
dampers, as well as any other gas
burning appliance to their previous
condition of use.
H
Any improper operation of the
common venting system should be
corrected so the installation conforms
with the National Fuel Gas Code,
ANSI Z223.1 latest edition. When
resizing, any portion of the common
venting system should be resized to
approach the minimum size as
determined, using the appropriate
tables in the National Fuel Gas Code,
ANSI Z223.1 latest edition.
Installation of boiler venting
The boiler should be located as close to
the chimney as possible. The vent
connection must be made in the
shortest possible way with minimum
elbows. If necessary, rearrange existing
water piping to achieve closest chimney
connection.
When the vertical pipe becomes the
chimney itself, the weight must not be
supported by the horizontal to vertical
draft hood on the boiler.
Avoid long horizontal runs of vent pipe.
Horizontal runs must be supported by
appropriate means to prevent sagging.
Horizontal runs should have no less
than ¼” rise per ft. from the boiler to
the vent terminal and must be properly
insulated to reduce cooling of flue gas.
Metal strapping must be used to
support horizontal runs every 4 ft. /
1.2 m.
Use approved vent material only.
The vent connector of this boiler must
not be connected into any portion of
mechanical draft systems operating
under positive pressure.
Based upon proper chimney and
breeching size, the boiler may be vented
into a chimney/breeching with a
direct-fired (atmospheric-fired) gas
water heater. Observe national codes,
local rules and regulations.
Terminate venting system outside with
approved termination at least 6 ft. / 1.8
m above boiler. Vent pipe must extend
at least 3 ft. / 0.9 m above the point
where it passes through the roof. Vent
termination must be at least 2 ft. /
0.6 m higher than any portion of the
building within 10 ft. / 3 m horizontal,
and vent termination must be at least 2
ft. / 0.6 m higher than roof peaks within
10 ft. / 3 m horizontal.
Down draft and condensation problems
must be corrected.
Installation of side wall vent system
A side wall power vent system can be
ordered from Viessmann. This package
includes the appropriate power venter,
vent terminal, and adaptor fittings for
each Vitogas 100, GS1 boiler model, as
well as installation instructions.
The vent system must terminate so that
proper clearances are maintained as
cited in the National Fuel Gas Code,
ANSI Z223.1 and as detailed in the Side
Wall Vent System Installation
Instructions. Observe and follow these
instructions carefully.
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Improper sizing, maintenance,
termination of vent or chimney can
cause flue gases to enter living
space. Any blockage of vent or
chimney by birds’ nests, ice, snow,
debris, or other materials can cause
flue gases to enter living space. Flue
gases entering living space can cause
carbon monoxide poisoning which can
result in severe personal injury or loss
of life.
WARNING
When the side wall vent system is
used, the vent damper MUST NOT be
installed.
WARNING
Summary of Contents for Vitogas 100 GS1 Series
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