Buderus 500-24C Installation And Maintenance Instructions Manual page 41

2.1.5 Adjusting the DHW flow regulator
Caution:
It is important to adjust the flow of hot water,
due to the resistance of the pipes in the in-
stallation and the differences in water pres-
sure.
The DHW flow regulator is located on the bottom frame
of the boiler ( fig. 55).
V Adjust the DHW flow regulator (fig. 55) to the desired
setting:
– To increase the flow of hot water:
turn valve clockwise "+".
– To reduce the flow of hot water:
turn valve counterclockwise "-".
Factory setting:
10 l/min of 48 °C, assuming that the DHW cold is 10 °C
and there is a pre-pressure of 2.5 bar.
2.1.6 Measuring the gas-supply pressure
(flow 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
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 Measure the standing gas-supply pressure.
V Pull off the tube from the gas test nipple.
V Tighten the gas testing nipple screw.
V Tighten the gas testing nipple screw.
Buderus 500-24C/28C - Subject to modifications resulting from technical improvements
fig. 57, item 1).
fig. 58, item 2).
fig. 57, item 2).
Fig. 55 DHW flow regulator
1 2
Fig. 56 DBA front
2
Commissioning
7215 3100-55.1TD
7215 3100-56.1TD
41