Actions
7
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
43
box 73
Check fan – tacho cable
H
DANGER OF FATAL ACCIDENT
due to electric shock
A
CAUTION!
To prevent damage, do not insert the measuring
electrodes of the multimeter too far into the holes of the
plug-and-socket connection.
z
Take the boiler out of service and tip the DBA control panel
forwards, see box 43, 44, 47 or 63.
z
Loosen the six screws and remove the rear section,
box 74
z
Pull out the tacho cable plug (item 1).
z
Set multimeter to “measure resistance”.
z
Attach the multimeter.
z
Check the tacho cable of the fan for breaks.
The electrical resistance measured at each individual wire
must be approximately 0
Ω
.
z
Check the tacho cable of the fan for internal short circuits.
The level of electrical resistance, measured between two
wires chosen at random, must be infinitely high.
box 75
z
Connect the tacho cable plug.
z
Refit the DBA control panel, following the above
procedure in reverse order.
z
Refit the casing and place the boiler into operation,
5
JP4
6
17
JP3
15
1
box 76
Check fan and/or replace
H
DANGER OF FATAL ACCIDENT
due to electric shock
A
DANGER OF FATAL ACCIDENT
All work on gas pipework and gas-fitting components
must be carried out by a company registered and
authorised for this purpose.
I
NOTE:
Please observe the fitting instructions supplied with the
fan.
z
Take the boiler out of operation and close the gas tap,
box 77
z
Pull out the power supply plug of the gas valve (item 1).
z
Loosen the union nut (item 2).
z
Detach the air silencer tube (item 3).
box 78
z
Pull out both fan plugs (item 2).
z
Pull out the glow ignitor plug (item 3).
z
Pull out the ionisation electrode plug (item 1).
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2
3
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2
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