
Installation
1
Installation and maintenance instructions for Buderus 500 - 24/S • 08/2006
21
Subject to modifications resulting from technical improvements!
Buderus • http://www.buderus-domestic.co.uk
1.8
Electrical connections
1.8.1
Mains connection
A mains supply of 230 V - 50Hz is required.
External controls are suitable for volt free or 230 V installation.
Wiring to the boiler MUST be in accordance with the current
I.E.E. (
BS.7671
) Wiring Regulations and any local regulations.
Wiring should be a 3 core PVC insulated cable, not less than
0.75 mm
2
(24 x 0.2 mm), and to table 16 of
BS.6500
.
Connection must be made in a way that allows complete isola-
tion of the electrical supply such as a double pole switch
having 3 mm contact separation in both poles, or by a three pin
connector, serving only the boiler and system controls. This
boiler is equipped with a double pole switch see fig. 24, item 1.
The means of isolation must be accessible to the user after
installation.
The electrical connection to the mains supply should be readily
accessible and adjacent to the boiler.
If the supply cord is damaged, it must be replaced by a regis-
tered Corgi installer to avoid a hazard and must be an original
spare part.
The electrical supply for both the boiler and the system must
be taken from the same fused spur outlet.
1.9
DBA wiring diagram
fig. 24 DBA
ON
OFF
1
NOTE
All Buderus boilers require a
permanent live.
WARNING!
Do not connect 230V to the connection block
on the back of the DBA.
DBA
Low voltage
High voltage
JP3
JP4
JP2
JP1
pin 6
pin 1
pin 1
pin 4
pin 1
pin 1
pin 17
pin 17
JP1
JP2
JP4
JP3
WARNING!
Do not connect 230V to the connection block on the back of the DBA.