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2
Commissioning
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 mains switch
(fig. 51, item 1) to "0".
Close the gas shut off valve (fig. 52, item 1).
Set the pressure gauge to "0".
Attach a tube from the pressure gauge to the gas test
nipple (the lower one, see fig. 53, item 2).
Slowly open the gas shut off valve (fig. 52, item 2).
Measure the standing gas-supply pressure.
Measuring the working pressure
Take the boiler out of service by pressing the mains switch
(fig. 51, item 1) to "0".
Close the gas shut off valve (fig. 52, item 1).
Set the pressure gauge to "0".
Attach a tube from the pressure gauge to the gas test
nipple (the lower one, see fig. 53, item 2).
Slowly open the gas shut off valve (fig. 52, item 2).
Open at least two radiators.
Set the mains switch (fig. 51, item 1) to "1".
Create a heat demand by pressing the service button "A"
(fig. 51, item 2), until an open-end spanner "
in the top left hand corner of the display.
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.
ATTENTION
If the required connection pressure is incorrect
contact your gas supplier.
Buderus • http://www.buderus-domestic.co.uk
36
fig. 51 DBA front
F
" appears
fig. 52 Gas valve
Installation and maintenance instructions for Buderus 500 - 24/S • 08/2006
1
2
2
1
item 1:
Gas valve closed
item 2:
Gas valve open
Subject to modifications resulting from technical improvements!
Drain
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