Buderus 600 - 11R Installation And Servicing Instructions page 34

2 Commissioning
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).
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.
Measuring the standing gas-supply pressure
Take the boiler out of service by pressing the power
switch (fig. 28, item 1) to "0".
Close the gas shut off valve (fig. 29, item 1).
Set the pressure gauge to "0".
Attach a tube from the pressure gauge to the gas test
nipple (the lower one, fig. 30).
Slowly open the gas shut off valve (fig. 29, item 2).
Measure the standing gas-supply pressure.
Measuring the working pressure
Take the boiler out of service by pressing the power
switch (fig. 28, item 1) to "0".
Close the gas shut off valve (fig. 29, item 1).
Set the pressure gauge to "0".
Attach a tube from the pressure gauge to the gas test
nipple (the lower one, fig. 30).
Slowly open the gas shut off valve (fig. 29, item 2).
Open at least two radiators.
Set the power switch (fig. 28, item 1) to "1".
Create a heat demand setting the chimney sweep
switch to "1" (fig. 28, item 6). The burner should
ignite after about 30 seconds.
Measure the working gas-supply pressure.
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.
Pull off the tube from the gas testing nipple.
Tighten the screw of the gas testing nipple.
Buderus • http://www.buderus-domestic.co.uk
34 Installation and servicing instructions for wall-mounted condensing gas boiler Buderus 600 - 11R/19R/24R • 02/2006
Gas nozzles Ø [mm]
Type of gas
supply
11R
Natural gas H (G20) 5.55
LPG 3.40
table 3 Gas nozzle diameter
1
2
10
Fig. 28 UBA
1
Fig. 29 Gas valve
item 1: Gas valve closed
item 2: Gas valve open
Subject to modifications resulting from technical improvements!
Venturi
tubes
19R/24R
6.5 Standard
4.15 Standard
6
3 4 5
9 8 7
2