70 | Heatronic boiler control settings
Copyright (optional information)6 720 643 068 (2011/06)
Service function 3.F: Constant DHW period
(only combi boiler ZWB..-3A)
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)
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.
Possible displays are:
• 00: Central heating only
• 01: Combi appliance
• 02: DHW tank temperature sensor (NTC) 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
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 h
as
completed 15 minutes of operation at
low output. The display shows in alternation 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 resetting the indication on the
display after completing inspection/servicing of the
appliance.
Default setting 00.
NOTICE: System damage or boiler
malfunction!
B Never change the setting of this service
function on heating boiler ZBR..-3A
appliances.
NOTICE: System damage or boiler
malfunction!
B Never change the setting of this service
function on heating boiler ZBR..-3A
appliances.
DANGER: Risk of flue gas poisoning!
If the condensate trap is not filled, flue gas
may escape from the dry trap.
B Only deactivate the trap filling sequence
for servicing purposes.
B When servicing is complete, reactivate the
trap filling function.
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