Troubleshooting
3
Subject to modifications resulting from technical improvements!
Buderus Ltd. • http://www.buderus-domestic.co.uk
Servicing manual for wall-mounted condensing gas boiler 600 Series 11S/19S/24S/24C • Issued 02/2006
67
3.1.36 Checking connections at the ERC or RC
z
Check contact link between cable and ERC or RC.
z
There should be a DC voltage of approx. 11.5 V at the ERC
or RC.
3.1.37 Replacing the room-temperature control device
z
Note order of cable terminals. Loosen all cables.
z
Attach cables, in the right order, to the new room-tempera-
ture control device.
z
Carry out the corresponding adjustment settings on the
room-temperature control device.
Fig. 90 Checking the controller-device connections at the
boiler
Key to control-device connections:
Item 1:
ON/OFF temperature controller
Item 2:
Mod. room temperature controller (digital) ERC / RC
Item 3:
I/O port / communication port
Item 4:
Outdoor-temperature sensor
Item 5:
Power supply 24 VAC/max. 6 VA
Item 6:
Turn-on voltage for three-way valve (9+11)
1
2
3
4
5
6
NOTE
It is possible, in order to limit the source of
errors, to disconnect the ERC or RC from the
boiler (bridge required at 3 and 4) and to install
a conductor bridge at 1 and 2 (fig. 90).
The heating and hot-water requirement is then
passed via the potentiometer setting of the
UBA.
