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5.0
Boiler venting
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.
Vitogas 50, RS boilers are Category I boilers. Category
I does not apply when boiler is side wall vented.
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 minimum elbows.
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 not less than
rise per ft. from the boiler to the vent terminal.
Metal strapping must be used to support horizontal runs
every 4 ft.
Use approved vent material only. For venting purposes,
1
a B-0, B-1 or B-1
⁄
2
vent connectors.
With this boiler installation, it is recommended to install
an 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.
5.1
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.
a)
Seal any unused openings in the common venting
system.
b)
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.
10
vent may be used. Use C vent for
Negative pressure Test
c)
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.
d)
Place in operation the appliance being inspected.
Follow the lighting instructions. Adjust thermostat
so appliance will operate continuously.
e)
Test for spillage at the draft hood relief opening
after 5 minutes of main burner operation. Use an
approved smoke test.
f)
After it has been determined that each appliance
remaining connected to the common venting
1
⁄
˝
system properly vents when tested as outlined
4
above, return doors, windows, exhaust fans,
fireplace dampers and any other gas burning
appliance to their previous condition of use.
g)
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, ANSI Z223.1- latest
edition.
5.2
Side wall vent system
A side wall power vent system can be ordered. This
package includes the appropriate power venter and
vent terminal for each boiler model, as well as
installation instructions. Consult Viessmann technical
sales representative for ordering.
The vent system must terminate so that proper
clearances are maintained as cited in the National Fuel
Gas Code, ANSI Z223.1, Section 7, and as detailed in
the Side Wall Vent System Installation Instructions.
Observe and follow these instructions carefully.
6.0
Accessories
Pressure relief valve, pressure gauge, drain cock and
fittings are packed separately. Refer to Fig. 13. Install
relief valve and pressure gauge into upper flange with
1˝ tapping. Install drain valve into lower flange with
tapping.
6.1
Installation of pressure relief valve (see Fig. 13)
Pressure relief valve must be installed. Do not install
shut-off valve between pressure relief valve and boiler.
3
⁄
˝
4
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