Download 6 - Lets Fix It

Actions
box 212 Check the Boulter Buderus 24V AC external
3-way valve – activation (1)
A
CAUTION!
To prevent damage, do not insert the measuring
electrodes of the multimeter too far into the holes of the
plug-and-socket connection.
z Take the boiler out of operation, see box 43, 44 or 47.
7
box 216
z Insert the power supply plug of the Boulter Buderus
24V AC external 3-way valve.
z Put the boiler into operation, see box 51, 54 or 55.
box 217 Replace the Boulter Buderus 24V AC external
3-way valve – servomotor
z Take the boiler out of operation, see box 43, 44 or 47.
box 213
z Remove the power supply plug of the servomotor of the
Boulter Buderus 24V AC external 3-way valve, see
box 213.
box 218
z Remove the power supply plug of the servomotor of the
Boulter Buderus 24V AC external 3-way valve.
box 214
z Put the boiler into operation, see box 51, 54 or 55.
box 215
z Remove the servomotor of the Boulter Buderus 24V AC
external 3-way valve. To release the servomotor press the
release catch (item 1) and twist the servomotor.
A
6
3
2
Plug-in contacts
of Boulter
Buderus 24V AC
external 3-way
valve
Purpose
Plug-in contacts
on DBA control
panel
2
24V AC
5
3
0V AC
6
6
_ \ __
7
DANGER OF DAMAGE TO THE SYSTEM!
Before removing the servomotor, check to see if the
Boulter Buderus 24V AC external 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.
box 219
z Fit the new servomotor by following the above procedure
in reverse order.
z Put the boiler into operation, see box 51, 54 or 55.
z Set the multimeter to “measure AC voltage”.
Minimum measuring range: 40V AC.
z Open a hot water tap.
z Adjust the hot water in the "Settings" menu on the DBA
control panel of the boiler to 60 °C, see box 61.
z Check to see if, during operating code C [0c], 24 V AC
is detected at plug-in contacts “2” and “6”.
z Close the hot water tap.
z Check to see if, during operating code C [0h] , 24 V AC
is detected at plug-in contacts “2” and “3”.
We reserve the right to make technical modifications
Boulter Buderus Ltd • http://www.boulter-buderus.co.uk
Servicing manual Gas condensing boiler Buderus 500-24/S, 500-24/C and 500-28/C • Issued 02/2005
63