Bosch Greenstar Series, Installation And Service Instructions For Contractors, Page: 55 / 80

Heatronic boiler control settings
55 Greenstar – 6721822579 (2021/01)
Fig. 74 Pump curve of the boiler pump combi boiler ZWB...-3A
Key to Fig. 73 and Fig. 74:
[1] Residual head pressure at speed 1
[2] Residual head pressure at speed 2
[3] Residual head pressure at speed 3 (default setting)
[4] Head pressure of the boiler pump by itself (at speed 3)
H Head pressure in feet of head (m)
Circulating water volume in gallons per minute (l/h)
In order to save as much energy as possible and keep any water
circulation noises to a minimum, select the lowest possible pump speed.
11 Heatronic boiler control settings
11.1 Guideline to service functions
The Heatronic allows easy setting and testing of many appliance
functions.
For an overview of service functions, see Chapter 11.2 on page 56.
Fig. 75 Overview of the controls
[1] Emissions test button
[2] Service button
[3] Display
[4] ECO button, service functions “up”
[5] Key pad lock, service functions “down”
Selecting a service function
The service functions are subdivided into two levels: The 1st level
includes service functions up to 0.E , the 2nd level includes service
functions starting with 8.A .
▶ Press and hold the service button until it lights up.
The display shows a code such as 1.A (first service level).
▶ Repeatedly press the key pad lock button or ECO button to scroll to
the desired service function.
▶ Press and release the emissions test button .
The chimney sweep button lights up and the display shows the
setting for the selected service function.
Adjust Value
▶ Repeatedly press the key pad lock button or ECO button to adjust the
value up or down.
▶ Record the value in the commissioning log (

page 78).
Saving the value
▶ Press and hold the emissions test button until the display
shows (value saved).
The unit automatically exits the service level if no button is pressed for
15 minutes.
Exiting the service function without saving values
▶ Briefly press the emissions test button .
The light of the emissions test button will go out.
Restoring factory settings
In order to reset all values for the service levels 1 and 2 to the factory
setting:
▶ Press and hold the service button until it lights up.
The display shows a code such as 1.A (first service level). Press the
button and key pad lock button simultaneously until the code 8.A
appears (second service level).
▶ On the second service level, select the service function 8.E and value
00 . The appliance restarts with the default settings.
0 2 1 3 5 4 6 8 7
15
20
25
10
5
0
H / ft
.
V / gpm
1
2
3
4
400 800 1200 1600
7
0
6
5
4
3
2
1
0
H / m
.
V / l/h
6 720 641 933-61.1O
1
2
3
4
V
max
1
2
3 4
e
6
max
1
2
3 4
5
6
1
2
3
4
5
6 720 641 933-52.1O
reset
eco
min