Individual Settings; Mechanical Settings; Checking The Size Of The Expansion Vessel; Setting The Central Heating Flow Temperature - Worcester ZWBR 7-28 HE plus Installation And Servicing Instructions

Individual settings

7 Individual settings
7.1

Mechanical settings

7.1.1

Checking the size of the expansion vessel

Maximum pressure at maximum CH flow temperature is
2.5 bar. If the pressure is greater than this then fit an
extra expansion vessel. Refer to table 11.
System Capacity – BS7074:1
Expansion Vessel Pressure
and System Capacity
Expansion Vessel
Expansion Vessel
Charge Pressure
System 1 bar
pressure
1.5 bar
and
capacity
Table 11
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.
With underfloor heating systems, observe
i
the maximum permissible flow tempera-
tures.
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.
y Lift off the yellow button on the temperature control
with a screwdriver.
6 720 610 332-27.1O
Fig. 38
32
ZWBR ZWBR
7-28 11-35
litres 18 10
0.75
bar 0.75
82
litres 147
46
litres 82
y Rotate yellow button through 180° and replace (dot
facing inwards).
The CH flow temperature is no longer limited.
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
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.
Service function
Anti-cycle time
Max. CH flow temp.
Max. heating output
Constant hot water cycle-
time
Variable pump settings
Tab. 13
For a detailed description, refer to Service
i
Booklet for the Engineer 7 181 465 347.
Displaying service functions
All service functions are displayed.
y Press any button to activate the main menu.
y Press or
pointing to Settings.
y Press the button.
y Press or
pointing to Service.
y Press the button.
y Press the button to select Display service
parameters.
Service function 0.0, Last fault is displayed.
y Press the or
current settings.
see
code no.
page
2.4 33
2.5 33
5.0 33
6.8 33
7.0 33
button until the arrow cursor is
button until the arrow cursor is
button to cycle through the
6 720 610 597 GB (01.07)