Buderus 800 - 5.3.24 Checking three-way valve activation

Servicing 5
Wall-mounted condensing gas boiler Buderus 800 - Subject to modifications resulting from technical improvements!
61
5.3.24 Checking the three-way valve for correct
activation
 Set the mains switch to “0”.
 Push in catch on regulating motor and remove bayo-
net connector by twisting anticlockwise (fig. 85).
 Remove regulating motor.
 Set the mains switch to “I” and press the “reset” but-
ton.
 Once the 800 Series is in operation, open one of the
hot-water taps. If the regulating motor starts up
(check for movement of red adjusting lever), the acti-
vation system of the three-way valve is in order.
 Shut the hot-water tap.
 Set the mains switch to “0”.
 If the activation system of the three-way valve is in or-
der, attach the regulating motor and lock into place
by twisting the bayonet connector.
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.
fig. 85 Checking the three-way valve for correct activation
fig. 86 Replacing the valve core on the 800 –
24/24T25/29/43/60
NOTE
Open the maintenance isolating valves and
then fill the 800 Series and purge the
system of air.