Buderus 800-24 Installation And Servicing Instructions page 30

2 Initial start-up
2.2.5 Checking for leaks in operational condition
Check with the burner running, all joints across the entire
gas route of the burner using a foaming agent.
The agent must be certified as a gas leak test agent.
Do not apply the agent to electrical connection cables.
2.2.6 Measuring the carbon monoxide content
Measuring point see fig. 40 on page 29.
The carbon monoxide values under vacuum must be smaller
than 400 ppm and/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.
Find and eliminate the cause.
2.2.7 Checking the operation
During commissioning and the annual inspection and servicing
routine the working order of all control, regulating and safety
devices must be checked to see if they are correctly set
(provided these devices can be adjusted).
Measuring the ionisation current
Move the mains switch to "0".
Loosen the plug-and-socket connector of the monitoring
cable and connect the measuring device in series (fig. 41).
Select on the measuring device the µA direct current
range. The measuring device must have a resolution of at
least 1 µA.
Move the mains switch to "I" and the chimney sweeper
switch to "1".
After the burner has fired, press the service button (fig. 37)
until "Y" is shown on the display.
Move the hot water temperature controller to "1".
Measure the ionisation current. The ionisation current must
be > 2 µA direct current under partial load.
Enter the measurement in the certificate.
Move the mains switch to "0".
Remove the measuring device and restore the original
condition of the plug-and-socket connection.
Move the chimney sweeper switch to "0".
Close the cover of the 2nd control level.
Set the temperature on the hot water temperature
controller to the desired value.
Move the mains switch to "I".
When the display shows "7" and the service button is
pressed, the display turns to "c".
Press the reset button until "r" is shown on the display.
Close the cover.
Subject to modifications resulting from technical improvements !
30 Installation and servicing instructions condensing gas boiler 800 - 24/29/43/60 and 800 - 24T25/29T25 H/V • edition 02/2006
fig. 41 Measuring the ionisation current
Buderus • http://buderus-domestic.co.uk