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We reserve the right to make technical modifications
Buderus Ltd. • http://www.buderus-domestic.co.uk
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Servicing manual Gas condensing boiler Buderus 500-24/S, 500-24/C and 500-28/C • Issued 02/2006
box 114
z
Set multimeter to “measure resistance”.
z
Detach the cables of the DHW temperature sensor (item 3
and 4) from the DBA control panel.
z
Measure the resistance of the cable of the DHW
temperature sensor and check it for short circuits and
breaks. See box 112.
z
Fit the cables of the DHW temperature sensor to the DBA
control panel (item 3 and 4).
box 115
z
Insert the cables of the corresponding DHW temperature
or outside air-temperature sensor.
z
Fit the DBA control panel and place the boiler into
operation, see box 54, 55 or 51.
box 116 Replace the flow NTC sensor and/or safety
sensor
z
Take the boiler out of operation, drain the heating system
and pull out the plug of the corresponding sensor,
see box 43, 44, 47, 45, 47, 49 or 50.
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2
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6
7
Room Controller
Hot water tank sensor
24 VAC
3-way valve
Room Controller
Hot water tank sensor
24 VAC
3-way valve
box 117
A
CAUTION!
Note that water will squirt out when the sensor is
removed. Have a bucket and a supply of dry cloths to
hand.
z
Pull out the plug of the safety sensor (item 1).
z
Detach the stop spring of the safety sensor by pulling in
the direction of the arrow (item 2).
z
Remove the safety sensor (item 3).
box 118
A
CAUTION!
Note that water will squirt out when the sensor is
removed. Have a bucket and a supply of dry cloths to
hand.
z
Detach the stop spring of the flow NTC sensor by pulling
in the direction of the arrow.
z
Remove the flow NTC sensor.
box 119
z
Fit the corresponding new sensor.
z
Fill the heating system, vent it of air and place the boiler
into operation, see box 52 to 58.
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3
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