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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
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box 201
z
Fit the new drive mechanism on the internal 3-way valve.
Ensure that the flat side faces upwards.
box 202
z
Connect the servomotor of the 3-way valve by following
the above procedure in reverse order.
z
Fill the heating system, vent it of air and place the boiler
into operation, see box 52 to 58.
box 203 Replace the internal 3-way valve
z
Take the boiler out of operation and drain the heating
system, see box 48 to 51.
box 204
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Disconnect the cable from the main switch, see box 54.
z
Pull the spring off the flow NTC sensor lead (item 1).
z
Pull out the flow NTC sensor plug (item 2).
z
Pull the main switch cable out of the nut (item 3).
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box 205
z
Remove the stop spring and 3-way valve-motor.
box 206
z
Pull the plug (item 1) out of the pump.
z
Loosen the four screws (item 3) on the pump.
z
Remove the return pipe with spring (item 4).
z
Remove the pipe to the expansion vessel with spring
(item 5).
z
Pull out the pump (item 2).
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