Technical data

Installation and servicing instructions for wall-mounted condensing gas boiler Buderus 600 - 11R/19R/24R • 02/2006 29

Subject to modifications resulting from technical improvements! Buderus • http://www.buderus-domestic.co.uk

Installation 1

1.9 External control connections

The wall-mounted condensing gas boiler can be fitted

with the following control devices:

– A room-temperature control device at 230V

connected to the RTH converter (see fig. 23, item 2)

– ON/OFF temperature controller, volt free (see fig. 23,

item 3).

1.9.1 External 230V controls (see also Y-plan and

S-plan on page 8 and 9)"

z 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 (fig. 22).

z Remove the cover of the RTH converter

(fig. 23, item 1).

z Feed the 230V switch live and neutral (from external

controls) through the cable gland.

z Identify the 230V terminal block by the shaded area

and 230V label.

z Connect the switch live to terminal "1" and a neutral

to terminal "2" (fig. 23, item 2).

z Replace covers.

1.9.2 Volt free external control device connection

z 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 (fig. 22).

z Remove the cover of the RTH converter

(fig. 23, item 1).

z Lead the control device wire through the cable lead.

z Fix the wire to terminal "1" and "2" of the volt free

connection (fig. 23, item 3).

Fig. 23 Connecting the control device

WARNING!

This appliance must be earthed.

NOTE

Terminal 3 (fig. 23, item 2) is not used.

NOTE

If using the boiler for central heating only.

Volt free controls may also be used.