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2
Commissioning
The optimum gas/air ratio is - 5 Pa (-0.05 mbar).
The pressure difference should be between -10 and 0 Pa
(see fig. 56).
If this is not the case then adjustment is needed:
Remove the safety screw with a flat head screwdriver
(fig. 57, item 1).
Adjust the adjustment screw of the burner pressure to the
correct gas/air ratio using a (4 mm) socket head wrench
and by referring to fig. 56.
Replace the safety screw (fig. 57, item 1).
Set mains power switch to "0" (see fig. 51, item 1).
Shut the gas shut off valve (see fig. 52, item 1).
Remove the tube from from the burner-pressure testing
nipple (see fig. 54, item 1).
Tighten the screw on the burner-pressure testing nipple.
Open the gas shut off valve (see fig. 52, item 2).
Turn the mains power switch to "1" (see fig. 51, item 1).
CAUTION
Check the test nipples for gas tightness.
NOTE
Technically it is not necessary to use a
combustion analyzer for CO
The CO
level is secured by the gas/air ratio as
2
described above.
A combustion analyzer, if available, can be
used to confirm CO
specifications on page 7).
2.1.7
Gas rating test
Isolate all other appliances.
Press the service button "A" to set the boiler to full load.
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.
2.1.8
Checking for leaks while boiler is in operation
Use an approved leak detector to check all connections for
possible leaks. The product must be certified as a gasleak-
testing agent.
Do not allow the product to come into contact with the
electrical wiring.
Buderus • http://www.buderus-domestic.co.uk
38
measurements.
2
levels (see technical
2
Installation and maintenance instructions for Buderus 500 - 24/S • 08/2006
wrong
correct
-15
-10
-0.15
-0.10
left turn
fig. 56 Pressure difference of gas/air ratio at partial load
fig. 57 Adjust gas/air ratio
Subject to modifications resulting from technical improvements!
wrong
-5
0
5 (Pa)
-0.05
0.00
0.05 (mbar)
right turn
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