Technical data

34 Installation and servicing instructions for wall-mounted condensing gas boiler Buderus 600 - 11R/19R/24R • 02/2006
Buderus • http://www.buderus-domestic.co.uk Subject to modifications resulting from technical improvements!
Commissioning2
2.2.5 Measuring the gas-supply pressure
(working pressure)
There are two ways to measure the gas-supply
pressure:
– measuring the standing gas-supply pressure (boiler
not in operation);
– measuring the working gas-supply pressure (boiler
operating at full power).
Measuring the standing gas-supply pressure
z Take the boiler out of service by pressing the power
switch (fig. 28, item 1) to "0".
z Close the gas shut off valve (fig. 29, item 1).
z Set the pressure gauge to "0".
z Attach a tube from the pressure gauge to the gas test
nipple (the lower one, fig. 30).
z Slowly open the gas shut off valve (fig. 29, item 2).
z Measure the standing gas-supply pressure.
Measuring the working pressure
z Take the boiler out of service by pressing the power
switch (fig. 28, item 1) to "0".
z Close the gas shut off valve (fig. 29, item 1).
z Set the pressure gauge to "0".
z Attach a tube from the pressure gauge to the gas test
nipple (the lower one, fig. 30).
z Slowly open the gas shut off valve (fig. 29, item 2).
z Open at least two radiators.
z Set the power switch (fig. 28, item 1) to "1".
z Create a heat demand setting the chimney sweep
switch to "1" (fig. 28, item 6). The burner should
ignite after about 30 seconds.
z Measure the working gas-supply pressure.
z The working gas-supply pressure should be
between:
a minimum of 17 mbar and a maximum of 25 mbar
(nominal connection pressure of 20 mbar) for
Natural gas.
a minimum of 30 mbar and a maximum 50 mbar
(nominal connection pressure 37 mbar for LPG.
z Pull off the tube from the gas testing nipple.
z Tighten the screw of the gas testing nipple.
Type of gas
supply
Gas nozzles Ø [mm]
Venturi
tubes
11R 19R/24R
Natural gas H (G20) 5.55 6.5 Standard
LPG 3.40 4.15 Standard
table 3 Gas nozzle diameter
NOTE
The difference between the standing and
working pressure may never be greater
than 5 mbar. If the difference between the
two is greater than 5 mbar then the
pressure loss in the gas pipe is too great.
Fig. 28 UBA
1
2345
6
78910
Fig. 29 Gas valve
item 1: Gas valve closed
item 2: Gas valve open
2
1