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We reserve the right to make technical modifications
Buderus Ltd. • http://www.buderus-domestic.co.uk
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Servicing manual Gas condensing boiler Buderus 500-24/S, 500-24/C and 500-28/C • Issued 02/2006
box 179
z
Put the boiler into full-load operation, see box 54, 55 or 61.
If the boiler goes into heating mode within approx.
3 minutes
:-h.
, the cause of the fault lies outside the
boiler.
z
Take the boiler out of operation, see box 43 or 44.
z
Remove the bridge connection.
z
Connect the ON/OFF or modulating control element to the
boiler.
z
Put the boiler into operation, see box 51, 54 or 55.
box 180 Adjust the output flow rate (applies to
combination boilers only)
A
CAUTION!
As the water pressure and pipework resistance in the
plumbing system can vary widely with each situation, it
is important to adjust correctly the DHW flow rate at the
boiler. Take a DHW flow rate reading, see box 12.
Adjust the DHW flow rate at the flow regulator for hot water.
To check the DHW flow rate press and hold the down "
D
"
arrow and read off the display in ltrs/m.
– To increase the DHW flow rate:
turn the flow regulator in direction “+”.
– To reduce the DHW flow rate:
turn the flow regulator in direction “–”.
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Adjust the flow rate of hot water at one of taps where the
user is likely to require hot water at an ideal temperature.
Factory default setting: see factory settings in the
installation instruction.
This assumes a cold water input temperature of 10 °C.
box 181 Check the internal 3-way valve – movement of
the servomotor
z
Take the boiler out of operation, see box 43, 44 or 47.
box 182
A
DANGER OF DAMAGE TO THE SYSTEM!
Before removing the servomotor, check to see if the
3-way valve is in its "heating mode" position, and wait
for the boiler display code
C [0h]
to appear. This
prevents sudden pressure surges occurring in the
heating circuit while the removal operation is taking
place, and the resultant accidental opening of the
pressure relief valve.
z
Remove the stop spring (item 1).
z
Remove the servomotor.
box 183
z
Put the boiler into operation, see box 54 and 55.
z
Use the "Settings" menu on the boiler DBA control panel
to adjust the temperature to 60 °C, see box 14 or 18.
z
Open a hot water tap.
z
Check to see if the servomotor of the internal 3-way valve,
during operating code
C [0c]
, rotates through a full
revolution.
z
Close the hot water tap.
z
Check to see if the servomotor runs back again.
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