Buderus 500 - 28/C Servicing Manual page 47

box 98
Loosen the four Allen screws on the pump.
Remove the top section of the pump.
box 99
Clean the pump impeller wheel.
box 100
Refit the top section of the pump.
Fill and vent the heating system, see box 52 to 58.
Fit casing, see box 51.
box 101 Replace the pump
H
DANGER OF FATAL ACCIDENT
due to electric shock
Take the boiler out of operation and drain the heating
system, see box 43, 44, 47, 45, 49 or 50.
Remove the power supply plug of the pump, see box 92.
We reserve the right to make technical modifications
Servicing manual Gas condensing boiler Buderus 500-24/S, 500-24/C and 500-28/C • Issued 02/2006
box 102
1
Loosen the union nuts (item 1) at the top and side of the
pump.
Remove the pump.
A
box 103
CAUTION!
Fit new flat sealing rings when installing the new pump.
Install the new pump.
Insert the power supply plug of the pump, fill and vent the
heating system of air and put the boiler into operation,
see box 57 to 60.
Fit casing, see box 51.
box 104 Check the flow, safety and DHW temp. sensors
(applies to external cylinder only)
Put the boiler into operation, see box 54 or 55.
Open the hot water tap and wait for the boiler to start up,
then gradually close the hot water tap to bring the CH flow
temperature to over 80 °C.
Take the boiler out of operation and remove the casing,
see box 43, 44 or 47.
Buderus Ltd. • http://www.buderus-domestic.co.uk
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