Bosch Combi FS Series, Installation And Maintenance Instructions For Contractors, Page: 57 / 100

Heatronic boiler control settings
57 Greenstar FS/Combi FS – 6 720 810 590 (2020/04)
11.2.2 Second service level
At first service level, service button lights up, press ECO button and key
pad lock button simultaneously until 8.A appears)
Table 31 Service functions, 2nd level
11.3 Description of the service functions
11.3.1 First level service
Service function 1.A: Maximum space heating output
Some gas supply companies offer a performance-dependent basic
price.
The output can be limited in percent between the minimum and
maximum nominal output to suit the specific heat demand.
Even if the heating output has been limited, the maximum nominal
output is still available for DHW generation.
▶ Select service function 1.A.
▶ Select heat output in MBH (kW) and determine associated setting in
percent (%).
▶ Enter the setting (

Section 11.1).
▶ Save the setting (

Section 11.1).
▶ Record the set heat output in the commissioning log (

page 75).
▶ Exit the service functions.
▶ The display returns to the supply temperature.
Default setting is the maximum nomunal output: 100 (100%)
Service function 1.b: Maximum DHW output
The hot water output can be adjusted between the minimum and
maximum DHW outputs to suit the heat transfer capacity of the DHW
tank coil.
▶ Select service function 1.b.
▶ Select the DHW output in MBH (kW) and determine the associated
setting in percent (%).
▶ Enter the setting (

Section 11.1).
▶ Save the setting (

Section 11.1).
▶ Record the set DHW output in the commissioning log (

page 75).
▶ Exit the service functions.
▶ The display returns to the supply temperature.
Default setting is the maximum nominal output: 100 (100%)
Service function 1.E: Pump mode for space heating operation
If an outdoor temperature sensor for an weather compensation control is
connected, pump control mode 04 is automatically set.
• Pump control mode 00 (automatic mode): The BUS control
controls the central heating pump.
• Pump control mode 01: For heating systems without control.
The supply temperature controls the central heating pump. When
there is a demand for heat, the central heating pump and the burner
start up.
• Pump control mode 02: Do not use.
• Pump control mode 03: The central heating pump runs continuously
(exceptions: See heating control operating instructions).
• Pump control mode: Intelligent control of central heating pump in
heating systems with weather compensation control. The heating
zone pump is only switched on when needed.
Default setting is 00
Service function 1.F: Pump mode (only heating boiler KBR..-3A)
NOTICE:
System damage or boiler malfunction!
▶ Never change the setting of this service function on combi boiler
KWB..-3A appliances.
Based on this setting, the pump connected to the Heatronic or 3-way
valve are controlled according to the configuration of the heating system.
The following settings are possible:
• Pump mode 00: The appliance is used only as central heating boiler.
• Pump mode 01: A 3-way valve for DHW tank loading is connected in
boiler circuit before low loss header (see also service function 2.A).
• Pump mode 02: Do not use this setting!
• Pump mode 03: A DHW tank pump is connected on the system side
after the low loss header.
In DHW mode, DHW tank loading pump runs.
In space heating mode, DHW tank loading pump does not run.
Default setting is 03
Service function 2.A: Heating circuit pump lock out time (only
heating boiler KBR..-3A)
NOTICE:
System damage or boiler malfunction!
▶ Never change the setting of this service function on combi boiler
KWB..-3A appliances.
This setting is only active if Service function 1. F: Pump mode is set to 01
(3-way valve).
During the runtime of an external 3-way valve actuator, the space heating
pump is blocked. Select the run time of the 3-way valve actuator
Display Service function Page
8.A Software version 61
8.b Code plug number 61
8.C GFA Gas burner control status 61
8.d GFA Gas burner control fault 61
8.E Restore boiler to factory settings 61
8.F Permanent ignition 61
9.A Constant mode 61
9.b Current fan speed 61
9.C Current boiler output 61
9.d Set fan start speed 61
9.E Turbine signal delay 61
9.F Heating zone pump post purge 61
A.b Display DHW temperature 62
A.C Display DHW tank temperature 62
b.F Solar DHW backup heating delay 62
C.d Display current heat demand 62