Buderus 800-24 Installation And Servicing Instructions page 58

5 Servicing
5.3.25 Replacing the control valve
Close maintenance isolating valves and drain the
800 Series.
Remove the control valve with a spanner and fit a new unit.
Fit regulating motor and lock into place by twisting the
bayonet connector.
Plug cable in.
NOTE
Open the maintenance isolating valves and
then fill the 800 Series and purge the system of
air.
5.3.26 Replacing the three-way valve
Close maintenance isolating valves and drain the
800 Series.
Loosen all screw-in tube connectors.
Remove three-way valve and fit new unit.
Refit screw-in tube connectors.
Fit regulating motor and lock into place by twisting the
bayonet connector.
Plug cable in.
Open maintenance isolating valves.
NOTE
Fill the 800 Series and purge the system of air.
5.3.27 Checking the condensation-water bypass
Check to ensure that the condensation-water bypass is
connected.
NOTE
The device itself is fitted with an additional
condensation-water bypass (located on the
fume exhaust outlet).
Subject to modifications resulting from technical improvements !
58 Installation and servicing instructions condensing gas boiler 800 - 24/29/43/60 and 800 - 24T25/29T25 H/V • edition 02/2006
fig. 86 Replacing the valve core on the 800 – 24/24T25/29/43/60
A
AB
fig. 87 Replacing the three-way valve
Key to three-way valve:
A hot water
B heating
AB boiler feed line
fig. 88 Function diagram of condensation-water bypass
B
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