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7
We reserve the right to make technical modifications
Buderus Ltd. • http://www.buderus-domestic.co.uk
Servicing manual Gas condensing boiler Buderus 500-24/S, 500-24/C and 500-28/C • Issued 02/2006
65
box 228 Check the Buderus 24V AC external
3-way valve – activation (2)
z
Take the boiler out of operation and remove the DBA
control panel, see box 43, 44, 47, 63 or 70.
z
Put the boiler into operation, see box 54 and 55.
z
Open 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 and box 14.
z
Set the multimeter to “measure AC voltage”.
Minimum measuring range: 40V AC.
Plug-and-socket connection
DBA control panel conn.
6
7
3
6
2
5
z
Check whether, with operating code
C [0c]
active,
there is a voltage of 24 V AC at the plug-in contacts item 6
and item 7.
z
Close the hot water tap.
z
Check whether, with operating code
C [0h]
active,
there is a voltage of 24 V AC at the plug-in contacts item 5
and item 6.
box 229
z
Fit the DBA control panel and place the boiler into
operation, see box 51, 54 or 55.
Plug-in contacts
on DBA control
panel
Purpose
Plug-in contacts
of Buderus 24V
AC external 3-
way valve
5
24V AC
2
6
0V AC
3
7
_ \ __
6
1
2
3
4
5
6
7
Room Controller
Hot water tank sensor
24 VAC
3-way valve
Room Controller
Hot water tank sensor
24 VAC
3-way valve
box 230 Measure the gas input pressure – static and
dynamic
A
DANGER OF FATAL ACCIDENT!
All work on gas supply pipes and gas-fitting
components must be carried out by a company
registered and authorised for this purpose.
z
Take the boiler out of operation and close the gas tap,
z
Open some of the radiator valves.
box 231
A
CAUTION!
The pressure gauge should be accurate to 2 decimal
places (X.00).
z
Reset the digital pressure gauge to zero.
A
CAUTION!
Throughout the measuring operation, keep the
pressure gauge in the same position (horizontal or
vertical) in which it was reset to zero.
z
Loosen by two turns the screw on the gas connection
pressure measuring nipple (item 1).
z
Fit the pressure gauge to the gas connection pressure
measurement nipple (item 2).
2
1
