Boiler Venting - Viessmann Vitogas 050 ECD Series Installation & Service Manual

Boiler venting (Category I)
The mounted boiler draft hood must not be altered or modified
in the field.
The boiler should be located as close to the chimney as
possible. The vent connection must be made in the shortest
possible way with a minimum quantity of elbows.
The ECD boiler draft hood must not support the weight of the
chimney. The chimney and vent connectors must be suitably
supported to prevent the draft hood from supporting the weight
of the chimney.
Warning:
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.
Avoid long horizontal runs of vent pipe. Horizontal runs must
be supported by appropriate means to prevent sagging, and
should have not less than
vertical vent connection.
Metal strapping must be used to support horizontal
runs every 3 ft.
Use approved vent materials only. For venting purposes,
a B-vent may be used.
With this boiler installation, it is recommended to install a
corrosion resistant approved liner within a masonry or unlined
chimney. Observe and follow local rules and regulations.
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. In Canada follow CSA B149.1
or .2, in USA follow National Fuel Gas Code ANSI Z223.1.
Always use latest edition of national codes for all venting
installation requirements.
Before connecting boiler to existing chimney, inspect chimney
for inside and outside conditions. Deteriorated chimneys are
unsafe.
Terminate venting system outside with approved termination at
least 6 ft. above the boiler. Vent pipe must extend at least 3 ft.
above the point where it passes through the roof. Vent
termination must be at least 2 ft. higher than any portion of
building within 10 ft. horizontal and vent termination must be at
least 2 ft. higher than roof peaks within 10 ft. horizontal.
Downdraft problems due to negative building pressure must be
corrected. Chimney condensation problems must be corrected.
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⁄ ˝ rise per ft. from the boiler to the
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Removal of existing boiler
When an 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.
1. Seal any unused openings in the common venting system.
2. Visually inspect the venting system for proper size and
horizontal pitch and determine there is no blockage or
restriction, leakage, corrosion or other deficiency which
would cause an unsafe condition.
3. Insofar as is practical, close all building doors and
windows and all doors between the space in which the
appliances remaining connected to the common venting
system are located 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.
4. Place in operation the appliance being inspected. Follow
the lighting instructions. Adjust thermostat so appliance
will operate continuously.
5. 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.
6. 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 and any other gas burning
appliance to their previous condition of use.
7. 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 Appendix G in
the National Fuel Gas Code Z223.1 – latest edition.
The above steps 1–7 must be followed for new
installations involving single or multiple ECD boilers.
Side wall vent system
A side wall power vent system can be ordered for the ECD
boiler. This package includes the appropriate power venter,
vent terminal and adaptor fittings for each ECD boiler model,
as well as installation instructions. The vent damper must not
be installed when the side wall vent system is used.
For boilers for connection to gas vents or chimneys, vent
installations shall be in accordance with Part 7, Venting of
Equipment, of the National Fuel Gas Code, ANSI Z223.1, or
applicable provisions of the local building codes.
Ignition system
Safe lighting and other performance criteria were met with the
gas manifold and control assembly provided on the boiler
when the boiler underwent tests specified in the ANSI Z21.13/
CSA 4.9 boiler standard.
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