Buderus 800 - Page 60

Servicing5
Wall-mounted condensing gas boiler Buderus 800 - Subject to modifications resulting from technical improvements!
60
5.3.21 Checking the wiring connection to the KIM
 Disconnect the system from the power supply.
 Check plugs and wiring connections to KIM
 Connect system to mains power supply.
5.3.22 Checking the controller connections at the boiler
 Set the mains switch to “0”.
 Remove loop (non-conductive) from terminals 1
and 2.
 Loosen cable at terminals 3 and 4.
 Fit a link between terminals 1 and 2, 3 and 4.
 Set the mains switch to “I” and press “reset”.
 If the 800 Series goes into standby mode after start-
up
(display 0 H), the room-temperature control device is
defective.
 Move mains power switch to “0”.
 If the room-temperature control device is in order,
remove the bridging leads and attach the cable and
(non-conducting) link.
5.3.23 Replacing the room-temperature control device
 Loosen all cables. Note order of cable terminals.
 Attach cables, in the right order, to the new room-
temperature control device.
 Carry out the corresponding adjustment settings on
the
room-temperature control device.
fig. 83 Checking the wiring connection to the KIM
fig. 84 Checking the controller connections at the boiler
NOTE
The system is delivered ready-fitted with a
non-conductive link between terminals
1 and 2.