Buderus 600 - 11S Installation And Servicing Instructions page 55

Servicing
5.3.20 Replacing the hot surface ignitor
Disconnect the system from the power supply.
Remove combustion-chamber cover.
Remove the earth (ground) lead from the hot surface
ignitor (fig. 79, item 1).
Loosen crosshead screw on UBA housing.
Swivel UBA housing downwards.
Open the UBA housing.
Unplug hot surface ignitor connection cable from UBA
housing (fig. 80).
Loosen nut on clamp used to secure earth (ground) lead
(fig. 79, item 2).
Detach retaining plate of hot surface ignitor (fig. 79, item 3)
and remove hot surface ignitor.
5.3.21 Measuring the ionisation current
Disconnect the system from the power supply.
Loosen the plug-and-socket connector of the monitoring
cable and connect the measuring device in series.
Select the µA direct current range on the multimeter.
The multimeter must have a resolution of at least 1 µA.
Reconnect the system to the power supply and turn the
chimney-sweep switch to "1".
Measure the ionisation current.
The ionisation current must be > 2 µA DC.
Enter the reading on the report form.
Disconnect the system from the power supply.
Remove the measuring device and restore the
plug-and-socket connection to its original state.
Turn the chimney-sweep switch to position "0".
Refit the cover for 2nd operating level.
Reconnect the system to the power supply. When the
display shows "7", press the service button to display "c".
Press the "reset" button. The display shows "r".
Subject to modifications resulting from technical improvements!
Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 11S/19S/24S/24C • 05/2004
Fig. 79 Replacing the hot surface ignitor
Fig. 80 Disconnect the plug-in cable from the UBA housing
Boulter Buderus Ltd. • http://www.boulter-buderus.co.uk
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