6 720 610 597 GB (03.02)
Individual settings
33
7 Individual settings
7.1 Mechanical settings
7.1.1 Checking the size of the expansion vessel
System Capacity – BS7074:1
7.1.2 Setting the central heating flow tempera-
ture
The central heating flow temperature can be set to
between 35˚C and 88˚C.
Limited maximum setting for low-temperature
operation
The temperature control is factory limited to setting E,
giving a maximum flow temperature of 75˚C.
Adjustment of the heating output to the calculated heat
demand is not required by the heating systems regula-
tions.
Removing the maximum setting limit
For heating systems which require higher flow temper-
atures, the maximum setting limit can be removed.
B Lift off the yellow button on the temperature control
with a screwdriver.
Fig. 39
B Rotate yellow button through 180° and replace (dot
facing inwards).
The CH flow temperature is no longer limited.
7.2 Settings on the Bosch Heatronic
7.2.1 General description
The text display module provides a convenient means of
setting various appliance functions.
This description is limited to those functions necessary
for commissioning.
Displaying service functions
All service functions are displayed.
B Press any button to activate the main menu.
B Press or button until the arrow cursor is
pointing to Settings.
B Press the button.
B Press or button until the arrow cursor is
pointing to Service.
B Press the button.
B Press the button to select Display service
parameters.
Service function 0.0, Last fault is displayed.
B Press the or button to cycle through the
current settings.
B Press the button to exit the menu.
Expansion Vessel Pressure
and System Capacity
ZWBR
7-30
ZWBR
11-35
Expansion Vessel litres 18 10
Expansion Vessel
Charge Pressure
bar 0.75 0.75
System
pressure
and
capacity
1 bar litres 82 147
1.5 bar litres 46 82
Table 11
i
With underfloor heating systems, observe
the maximum permissible flow tempera-
tures.
6 720 610 332-27.1O
Control setting CH flow temperature
1 approx. 35˚C
2 approx. 43˚C
3 approx. 51˚C
4 approx. 59˚C
5 approx. 67˚C
E approx. 75˚C
max approx. 88˚C
Table 12
Service function code no.
see
page
Anti-cycle time 2.4 34
Max. CH flow temp. 2.5 34
Max. heating output 5.0 34
Constant hot water cycle-
time
6.8 34
Variable pump settings 7.0 34
Table 13
i
For a detailed description, refer to Service
Booklet for the Engineer 7 181 465 347.
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