Buderus 500 - 28/C Servicing Manual page 46

7 Actions
box 91 Check the pump – activation
H
DANGER OF FATAL ACCIDENT
A
due to electric shock
CAUTION!
To prevent damage, do not insert the measuring
electrodes of the multimeter too far into the holes of the
A
plug-and-socket connection.
CAUTION!
Close gas valve during pump test.
Take the boiler out of operation, see box 43, 44 or 47.
box 92
Pull out the power supply plug of the pump.
box 93
Set the multimeter to "measure AC voltage".
Minimum measuring range: 250V AC.
Put the boiler into operation, see box 54 and 55.
Carry out a multimeter check to verify whether 230V AC is
present at both outer contacts (L and N) of the power
supply plug of the pump during locking fault code [2l] .
We reserve the right to make technical modifications
46 Servicing manual Gas condensing boiler Buderus 500-24/S, 500-24/C and 500-28/C • Issued 02/2006
box 94
Insert the power supply plug of the pump.
Fit casing, see box 51.
box 95 Check the pump – power supply cable
H
DANGER OF FATAL ACCIDENT
due to electric shock
Take the boiler out of serve and tip the DBA control panel
forwards, see box 43, 44, 47 or 63.
Loosen the six screws and remove the rear section,
see box 70.
Remove the power supply plug of the pump, see box 92.
box 96
JP1
Check the power supply cable of the pump for breaks.
The electrical resistance measured at each individual wire
must be approximately 0
Check the power supply cable of the pump for internal
short circuits. The level of electrical resistance, measured
between two wires chosen at random, must be infinitely
high.
Fit the power supply plug of the pump, fit the DBA control
panel and place the boiler into operation, see box 53, 54
or 55.
box 97 Check the pump – soiling
Take the boiler out of operation and drain the heating
system, see box 43, 44, 47, 45, 49 or 50.
Buderus Ltd. • http://www.buderus-domestic.co.uk
Ω
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