Buderus 500 - 28/C Servicing Manual page 67

box 237
Use the adjustment screw to readjust the gas/air ratio if
I
necessary (item 1).
NOTE:
The adjustment screw (4mm Allen screw) is located
behind the screw-on cover.
box 238
Take the boiler out of operation and close the gas tap,
see box 43, 44 or 46.
Remove the pressure gauge.
Tighten the screw on the burner pressure measurement
nipple.
Open the gas cock and place the boiler into full-load
operation, see box 59, 54, 55 and 13.
Wait for the boiler to start.
Use a detection product to check the burner pressure
measurement nipple for leaks. Use an authorised foam-
type leak detection product for this purpose.
Take the boiler out of operation, see box 43 or 44.
Fit the casing and place the boiler into operation,
see box 51, 54 or 55.
box 239 Vent the gas flow pipe.
A
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.
Take the boiler out of operation and close the gas tap,
see box 43, 44, 46 or 47.
We reserve the right to make technical modifications
Servicing manual Gas condensing boiler Buderus 500-24/S, 500-24/C and 500-28/C • Issued 02/2006
box 240
1
box 241
box 242 Replace the automatic air vent
1
Loosen by two turns the screw on the gas connection
pressure measuring nipple (item 1).
Connect a long hose (item 2) to the gas connection
pressure measurement nipple and then run this hose out
of the building.
Leave the gas cock open until no further air escapes from
the hose, see box 59.
Close the gas cock, see box 46.
Remove the hose from the gas connection pressure
measurement nipple.
Tighten the screw on the gas connection pressure
measurement nipple.
Open the gas tap, see box 59.
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.
Fit the casing and place the boiler into operation,
see box 51, 54 or 55.
Take the boiler out of operation and drain the heating
system, see box 48 to 50.
Buderus Ltd. • http://www.buderus-domestic.co.uk
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