Benchmark ZWB 7-29 CC1 Installation And Servicing page 55

The next time the central heating or heat store calls for
heat, the appliance is held at a low heat output for 15
minutes. The display shows -II- in alternation with the
CH flow temperature.The factory setting is 1 (enabled).
If the condensation trap is not filled with
water, flue gas can escape!
B The trap filling programme should only
be disabled in order to carry out servic-
ing work.
B Always re-enable the trap filling pro-
gramme after completing servicing
work.
To switch off the trap filling programme to carry out
servicing work:
B Press and hold the
ously until the display shows = =.
The and buttons will light up.
B Turn the temperature control
shows 8.5.
After a short delay, the display then shows the trap
filling programme setting (1. = Enabled).
B Turn the temperature control
shows 0. (= Disabled).
The display and the
B Press and hold the
ously until the display shows [ ].
The trap filling programme is now disabled.
B Regulate the temperature control
perature control on the previously set positions.
The display shows the heating outlet temperature.
0
Display shows (venting function)
0
The first time the appliance is switched on, it automati-
cally activates a one-off venting sequence in which the
heating pump switches on and off at intervals for about
8 minutes.
This function can be activated on Service Level 2, Serv-
ice Code 7.3, if it is required at any other time.
7 181 465 346 GB (03.02)
and buttons simultane-
until the display
until the display
and buttons will flash.
and buttons simultane-
and the tem-
Bosch Heatronic board functions
7