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7
We reserve the right to make technical modifications
Buderus Ltd. • http://www.buderus-domestic.co.uk
62
Servicing manual Gas condensing boiler Buderus 500-24/S, 500-24/C and 500-28/C • Issued 02/2006
box 207
z
Remove all pipes beneath the boiler.
A
CAUTION!
Note that water will squirt out when the internal 3-way
valve is removed. Have a bucket and a supply of dry
cloths to hand.
z
Loosen the gas pipe at the gas valve.
z
Remove the two screws (item 1).
z
Remove the complete hydraulic assembly.
z
Remove the four M8 nuts (item 2).
z
Remove the five screws (item 3).
z
Remove the plastic block (H3).
box 208
z
Loosen the screw in the plastic block (item 2).
z
Remove the pressure relief valve (item 1), see box 276
or 277.
z
Remove the drive mechanism on the internal 3-way valve,
see box 200.
A
CAUTION!
Note that water will squirt out when the internal 3-way
valve is removed. Have a bucket and a supply of dry
cloths to hand.
1
2
2
1
2
3
3
H3
3
2
1
box 209
z
Replace the housing of the 3-way valve.
box 210
z
Refit all components, 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 211 Check the Buderus 24V AC external
3-way valve – movement of the servomotor
z
Put the boiler into operation, see box 54 and 55.
z
Adjust the hot water in the "Settings" menu on the DBA
control panel of the boiler to 60 °C, see box 61.
z
Open a hot water tap.
z
Check to see if the servomotor of the Buderus
24V AC external 3-way valve, during the operating
code
C [0c]
rotates from the setting for heating mode
(position “
1
”) to the position for hot water mode
(position “
2
”).
z
Close the hot water tap.
z
Check to see if the servomotor runs back again.
z
Adjust the hot water in the “Settings” menu on the DBA
control panel of the boiler, see box 61.
