Buderus 500 - 28/C Servicing Manual page 70

7 Actions
box 259 Replace/clean the heat exchanger
H
DANGER OF FATAL ACCIDENT
A
due to electric shock
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, close the gas cock and
drain the heating system, see box 46 or 48 to 50.
Remove the power supply plug of the glow ignitor,
see box 131.
Remove the plug of the ionisation electrode, see box 144.
Remove the power supply plug of the gas valve, union nut
and air silencer tube, see box 77.
Pull out both fan plugs, see box 78, item 1.
Remove the gas/air unit along with the burner,
see box 247 and 248.
Remove the heat exchanger-gas/air seal, see box 251.
box 260
1
1
Open the four clip fastenings(item 1).
Clean the heat exchanger with a brush and compressed
air or with TAB2.
In the event of serious restriction, continue with box 261.
We reserve the right to make technical modifications
70
1
1
Servicing manual Gas condensing boiler Buderus 500-24/S, 500-24/C and 500-28/C • Issued 02/2006
box 261
1
Remove the restrictor baffle (item 1).
box 262
Remove the stop spring on the top left-hand side of the
heat exchanger by turning it towards the arrow.
box 263
Remove the stop spring on the bottom right-hand side of
the heat exchanger by turning it towards the arrow.
Buderus Ltd. • http://www.buderus-domestic.co.uk