External Controls - Buderus 500-24S Installation And Maintenance Instructions Manual

Electrical wiring
Caution:
THIS APPLIANCE MUST BE EARTHED
Ensure that your appliance is connected cor-
rectly. If you are in any doubt consult a quali-
fied electrician.
NOTE
The wires in this mains lead are coloured in
accordance with the following code:
EARTH - GREEN AND YELLOW
NEUTRAL - BLUE
LIVE - BROWN
The appliance mains cable, wire colours may
not correspond with the markings that identi-
fy the terminals on the fuse spur connector,
refer to the guide below:
V Connect green and yellow wire to terminal
marked E or
green-and-yellow
V Connect brown wire to terminal marked L
or coloured red
V Connect blue wire to terminal marked N or
coloured black

1.11 External controls

Buderus boilers are designed to modulate based on room
temperature, this reduces the amount of energy used to
heat the property, when compared with using 230V or volt
free controls.
Buderus recommend thermostats from the ModuLink and
RC series in order that the customer can benefit from the
increased comfort and savings of modulating on room
temperature.
The wall-mounted condensing gas combi boiler can be fit-
ted with the following external controls:
1. ModuLink 250 RF (
ommended Buderus 24V controls.
2. Room-temperature control device and timer at 230V
connected under the grey cover
( subsection 1.11.2).
3. ON/OFF temperature controller, volt free
( subsection 1.11.3).
Connecting any external controls will require the case
removal to gain access to the boiler control unit (DBA)
Gain access to the DBA connection block
V Remove the boiler's case (
V Remove the securing screw (
V Lower the boiler control unit (DBA) (
Buderus 500-24S - Subject to modifications resulting from technical improvements
or coloured green or
subsection 1.11.1) or other rec-
fig. 5 on page 11).
fig. 32, item 1).
fig. 32, item 2).
Fig. 31 Electrical wiring
1 Permanent live
1
2
Fig. 32 Lower the DBA
1
Installation
7215 3100-31.1TD
7215 3100-32.1TD
25