Buderus 500-24C Installation And Maintenance Instructions Manual page 42

2
Commissioning
Measuring the working pressure
V Take the boiler out of service by pressing the mains
switch ( fig. 56, item 1) to "0".
V Close the gas shut off valve (
V Set the pressure gauge to "0".
V Loosen the gas test nipple screw two turns.
V Attach a tube from the pressure gauge to the gas test
nipple (the lower one,
V Slowly open the gas shut off valve (
V Ensure at least two radiators are open to hot water
flow.
V Set the mains switch (
V Create a heat demand by pressing the service
button ( fig. 56, item 2), until an open-ended
spanner appears in the top left hand corner of the
display.
V Measure the working gas-supply pressure.
V 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 Natu-
ral gas.
– a minimum of 30 mbar and a maximum 50 mbar
(nominal connection pressure 37 mbar for LPG.
V Pull off the tube from the gas testing nipple.
V Tighten the gas testing nipple screw.
ATTENTION
If the required connection pressure is incor-
rect, contact your gas supplier.
Ensure that all disturbed joints and connections are
checked for gas tightness on completion of tasks.
42
fig. 57, item 1).
fig. 58, item 2).
fig. 57, item 2).
fig. 56, item 1) to "1".
Buderus 500-24C/28C - Subject to modifications resulting from technical improvements
1
Fig. 57 Gas valve
item 1: Gas valve closed
item 2: Gas valve open
Fig. 58 Measuring the gas-supply pressure
2
7215 3100-57.1TD
7215 3100-58.1TD