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We reserve the right to make technical modifications
Buderus Ltd. • http://www.buderus-domestic.co.uk
Servicing manual Gas condensing boiler Buderus 500-24/S, 500-24/C and 500-28/C • Issued 02/2006
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box 237
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Use the adjustment screw to readjust the gas/air ratio if
necessary (item 1).
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NOTE:
The adjustment screw (4mm Allen screw) is located
behind the screw-on cover.
box 238
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Take the boiler out of operation and close the gas tap,
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Remove the pressure gauge.
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Tighten the screw on the burner pressure measurement
nipple.
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Open the gas cock and place the boiler into full-load
operation, see box 59, 54, 55 and 13.
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Wait for the boiler to start.
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Use a detection product to check the burner pressure
measurement nipple for leaks. Use an authorised foam-
type leak detection product for this purpose.
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Take the boiler out of operation, see box 43 or 44.
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Fit the casing and place the boiler into operation,
box 239 Vent the gas flow pipe.
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DANGER OF FATAL ACCIDENT!
All work on gas supply pipes and gas-fitting
components must be carried out by a company
registered and authorised for this purpose.
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Take the boiler out of operation and close the gas tap,
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box 240
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Loosen by two turns the screw on the gas connection
pressure measuring nipple (item 1).
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Connect a long hose (item 2) to the gas connection
pressure measurement nipple and then run this hose out
of the building.
box 241
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Leave the gas cock open until no further air escapes from
the hose, see box 59.
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Close the gas cock, see box 46.
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Remove the hose from the gas connection pressure
measurement nipple.
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Tighten the screw on the gas connection pressure
measurement nipple.
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Open the gas tap, see box 59.
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Use a detection product to check the gas connection
pressure measurement nipple for leaks. Use an
authorised foam-type leak detection product for this
purpose.
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Fit the casing and place the boiler into operation,
box 242 Replace the automatic air vent
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Take the boiler out of operation and drain the heating
system, see box 48 to 50.
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