Bosch Installation Manual

Heatronic boiler control settings
59
Greenstar – 6721822579 (2021/01)
Service function 3.F: Constant DHW period
(only combi boiler ZWB...-3A)
NOTICE
System damage or boiler malfunction!
▶ Never change the setting of this service function on heating boiler
ZBR...-3A appliances.
The constant DHW period specifies how long the space heating mode
remains disabled after DHW is drawn.
The duration for keeping DHW hot can be set from 00 to 30 (0 to 30
minutes).
Default setting is 01 (1 minute).
Service function 4.b: Maximum heat exchanger temperature (only
combi boiler ZWB...-3A)
NOTICE
System damage or boiler malfunction!
▶ Never change the setting of this service function on heating boiler
ZBR...-3A appliances.
This function can be used to reduce limestone built-up in the heat
exchanger, which increases with temperature. The maximum heat
exchanger temperature can be set in steps of 1 °F (0.5 °C).
Service function 0.E is set to 00 (metric units):
• The maximum temperature for keeping the heat exchanger hot can be
set from 40 to 65 (40 to 65 °C).
Service function 0.E is set to 01 (US-customary units):
• The maximum temperature for keeping the heat exchanger hot can be
set from 104 to 150 (104 to 150 °F).
Default setting is 140 (140 °F (60 °C)).
Service function 4.d: Audible fault warning tone
The appliance can be set to sound an audible alarm to alert the operator
of a fault present. The audible warning tone can be deactivated with the
service function 4.d.
00: Warning tone off
01: Warning tone on
Default setting is 01 (ON).
Service function 4.E: Appliance type
This service function displays the appliance type detected.
Available displays are:
• 00: Central heating only
• 01: Combi appliance
• 02: DHW tank temperature sensor () connected to Heatronic.
• 03: DHW tank thermostat connected to Heatronic.
• 04: Stratified DHW tank
• 05: Tank with NTC return
Service function 4.F: Condensate trap filling sequence
DANGER
Risk of flue gas poisoning.
If the condensate trap is not filled, flue gas may escape from the dry trap.
▶ Only deactivate the trap filling sequence for servicing purposes.
▶ When servicing is complete, reactivate the trap filling function.
The trap filling sequence ensures that the condensate trap is filled after
initial installation or after a longer downtime of the appliance.
The trap filling sequence is activated if:
• The appliance is switched OFF using the ON/OFF switch
• The burner has not been in use for at least 28 days
• You are switching between summer and winter mode
The next time there is a demand for heat in central heating or hot water
mode, the appliance is held at low output for 15 minutes. The trap filling
sequence remains active until the appliance has completed 15 minutes
of operation at low output. The display shows alternating with the
supply temperature.
The following settings are available:
• 00: Condensate trap filling sequence is off.
• 01: Trap filling program at the lowest output.
• 02: Trap filling sequence at set minimum output.
Default setting is 01.
Service function 5.A: Reset inspection interval
This function enables you to reset the indication on the display after
completing inspection/servicing of the appliance.
Default setting 00.
Service function 5.b: Fan post purge time
This service function allows setting the time the fan purges after the
burner is shut off.
The post purge time can be set from 01 to 18 (10 - 180 seconds).
Default setting is 03 (30 seconds).
Service function 5.E: Functionality of black plug in boiler junction
box
With this service function you can set the functionality of the black plug
in the boiler junction box.
The following settings are possible:
• 00: Off - black connector in junction box is disabled (120VAC output
deactivated).
• 01: DHW recirculation pump enabled - See Bosch room controller
instructions on how to set a recirculation pump program.
• 02: External heating zone pump in heating circuit without 3-way
valve.
• 03: External heating zone pump in heating circuit without mixer
controlled by Heatronic running in parallel with boiler pump in central
heating mode
Default setting is 03.
Service function 5.F: Set inspection interval
This service function allows you to set the number of months after which
the 'service due' indication (Inspection) alternates on the display
with the supply temperature.
The number of months can be set from 00 - 72 (0 to 72 months).
Default setting is 00 (disabled).