Buderus 600 - 11R Installation And Servicing Instructions page 38

2 Commissioning
2.2.10 Function testing
NOTE
During initial start-up and annual
servicing, make sure that all control,
regulating and safety devices are in full
working order and, if applicable, check for
correct adjustment.
Measuring the ionisation current (fig. 35)
Disconnect the system from the power supply.
Loosen the plug-and-socket connector of the ionisa-
tion electrode and connect the multimeter in series.
On the measuring device, select the µ-direct current
range. The measuring device must have a resolution
of at least 1 µA.
Make sure that the system pump is running.
Reconnect the system to the power supply and turn
the chimney-sweep switch to "1".
Measuring the ionisation current. The ionisation
current being checked must measure >2 µA direct
current.
Enter the reading on the report form.
Disconnect the system from the power supply.
Remove multimeter and restore the plug-and-socket
connection to its original state.
Turn the chimney sweep switch to position "0".
Reconnect the system to the power supply.
When the display shows "7" and the service button is
pressed, the display turns to "c". Press the Reset
button. The display shows "r".
Fit the casing (see fig. 36, item 1).
Tighten the fixing screw (see fig. 36, item 2).
2.2.11 Balancing
1. Set the programmer to ON for both CH and HW. Turn
the cylinder thermostat down. Close the manual or
thermostatic valves on all radiators leaving the twin
lockshield valves (on the radiators referred to above)
in the open position. Turn up the room thermostat
and adjust these lockshield valves to give boiler flow
and return temperatures not more than 20 °C apart.
These valves should now be left as set.
2. Open all manual or thermostatic radiator valves and
adjust the lockshield valves on remaining radiators to
give around 11 °C temperature drop at each radiator.
3. Turn up the cylinder thermostat and adjust the
cylinder balancing valve so that the cylinder achieves
a maximum flow consistent with adequate flow to the
radiators. Check that with only the domestic hot
water loop in circuit a differential temperature of
20 °C across the boiler is not exceeded.
Buderus • http://www.buderus-domestic.co.uk
38 Installation and servicing instructions for wall-mounted condensing gas boiler Buderus 600 - 11R/19R/24R • 02/2006
Fig. 35 Measuring the ionisation current
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Fig. 36 Fitting the case
Subject to modifications resulting from technical improvements!
2