Buderus 600 - 11S Installation And Servicing Instructions page 28

2 Initial start-up
If the gas/air ratio does not conform to specifications,
readjust at the setscrew (fig. 37, item 1).
Turn mains power switch and chimney-sweep switch to "0".
Remove the measuring equipment and retighten the screw
in the burner-pressure measuring nipple.
Readjust the hot-water temperature controller to its original
setting.
Turn the mains power switch to "I".
2.1.13 Gas rating test
Isolate all other appliances.
Set the boiler to maximum firing rate.
Ensure that there is no modulating of the fan gas valve.
Carry out the Gas Rating procedure as described in
"Essential Gas Safety' 3rd edition on pages 169-176.
2.1.14 Record readings
Unscrew the corresponding sealing closure (fig. 38) on the
connection adapter for the combustion-air/flue-gas system
and replace it once the measuring operation in question
has been carried out.
Carbon monoxide content
CAUTION
The carbon monoxide values under vacuum
must be smaller than 400 ppm or 0.04 Vol%.
Values around or exceeding 400 ppm indicate
a faulty burner adjustment, a dirty gas burner
or heat exchanger, or a defective burner.
Ensure that the cause of the fault is remedied
immediately.
2.1.15 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. 39)
Disconnect the system from the power supply.
Loosen the plug-and-socket connector of the ionisation
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.
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.
Subject to modifications resulting from technical improvements!
28 Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 11S/19S/24S/24C • 05/2004
Fig. 38 Measuring points on exhaust conduit
Key to Fig. 38:
1: Exhaust-fume temperature, CO
2: Combustion-air temperature
Fig. 39 Measuring the ionisation current
Boulter Buderus Ltd. • http://www.boulter-buderus.co.uk
1 2
, CO, NO
2 x