Buderus 600 - 11S Installation And Servicing Instructions page 58

5 Servicing
NOTE
Open servicing valves, fill the 600 - 11S / 19S /
24S / 24C and purge the system of air.
Connect the system to the power supply, set the mains
switch to "I" and press the "reset" button.
5.3.26 Checking the ERC/RC connections to the UBA
Disconnect the system from the power supply.
Loosen crosshead screw on UBA housing.
Swivel the UBA housing downwards (fig. 85).
Push in UBA housing on left-hand side and open to the
right (fig. 86).
Check to ensure that ERC or RC are correctly connected
to 3 and 4.
Terminals 1 and 2 should not be wired in any way.
The unit is supplied with a dummy connector between
terminals 1 and 2 (fig. 87). The DC voltage at terminals 3
and 4 should be approx. 11.5 V. If this is not so, the UBA or
the cable harness is defective.
Shut the UBA housing once more.
Swivel the UBA housing upwards and screw into place.
Connect system to mains power supply.
Set the mains switch to "I" and press the "reset" button.
5.3.27 Replacing the terminal strip
Note order of cable terminals. Loosen all cables.
Connect the cables, in the right order, to the new terminal
strip.
Subject to modifications resulting from technical improvements!
58 Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 11S/19S/24S/24C • 05/2004
Fig. 85 Swivel UBA housing downwards
Fig. 86 Opening the UBA housing
Boulter Buderus Ltd. • http://www.boulter-buderus.co.uk