Buderus 600 - 11S Installation And Maintenance Instructions Manual page 19

1.10.1 External controls
The wall-mounted condensing gas boiler can be fitted with the
following control devices:
– ON/OFF temperature controller, volt free;
– A room-temperature control device at 230V connected to
the connection plate (fig. 20, item 1).
– A modulating room-temperature control device at 24 Volt
connected to the connection plate (fig. 22, item 1) such as
the 250 RF ModuLink and the
1.10.2 External 230V controls
Loosen crosshead screw (fig. 18, item 1) on burner-control
unit (UBA).
Swivel burner-control unit downwards.
Open the back of the burner-control unit to the right
(fig. 19).
Connect the black pre-wired lead to a permanent live
supply (from the same fused isolator as all other controls
on the heating system), L N E.
Feed the 230V switch live and neutral (from external
controls) through the cable lead.
Identify the 230V terminal block by the shaded area and
230V label.
Connect the switch live to terminal "1" and a neutral to
terminal "2" (fig. 20, item 1).
Replace covers.
NOTE
Terminal 3 (fig. 20, item 2) is not used.
Subject to modifications resulting from technical improvements!
Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 11S/19S/24S/24C • 02/2006
RT controllers.
i
1
Fig. 18 Swivel the housing of the burner-control unit
downwards
Fig. 19 Open back of the burner-control unit
Fig. 20 Connection box in burner-control unit -
230V connection
Buderus • http://www.buderus-domestic.co.uk
Installation
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