Purging Function - Bosch ZBR16-3A Installation And Service Instructions Manual

68 | Heatronic boiler control settings
Service function 2.A: Heating circuit pump lockout time
(only heating boiler ZBR..-3A)
NOTICE: System damage or boiler
malfunction!
B Never change the setting of this service
function on combi boiler ZWB..-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 between 01 - 24 (10 - 240) seconds
according to the manufacturer's documentation
Default setting is 24 (240 seconds).
Service function 2.b: Maximum supply temperature
The values of this service function displayed depend on
the setting of the service function 0.E:
Service function 0.E is set to 00 (metric units):
• The maximum supply temperature can be adjusted
between 35 and 88 (35 - 88 °C).
Service function 0.E is set to 01 (US customary units):
• The maximum supply temperature can be adjusted
between 96 and 190 (96 - 190 °F).
Default setting is 190 (190 °F (88 °C)).
Service function 2.C: Purging function
When the appliance is switched ON for the
first time, it performs a once-only purging
sequence. This involves the heating zone
pump switching on and off at intervals (for
approx. 4 minutes).
The display shows
supply temperature.
This service function allows activating the
purging function manually, e.g. after servicing.
6 720 643 068 (2011/06)
.
in alternation with the
The following settings are possible:
• 00: Purging function off
• 01: Purging function is switched on and after
completion automatically reset to 00
• 02: Purging function is permanently on and is not reset
to 00
Default setting is 00 for heating boilers ZBR..-3A
appliances, otherwise 01.
Service function 2.d: Thermal disinfection (legionella
protection)
WARNING: Risk of scalding!
Hot water can result in severe scalding.
B Carry out thermal disinfection only outside
the normal hours of use.
B Install a tempering valve if this function is
enabled permanently.
When this service function is enabled, the DHW is
permanently heated to approx. 158 °F (70 °C) if the DHW
temperature dial has been turned clockwise to max.
The following settings are possible:
• 00: Thermal disinfection not enabled
• 01: Thermal disinfection enabled
Default setting is 00 (disabled).
Service function 2.F: Operating mode
With this service function, you can temporarily change the
appliance's operating mode.
The following settings are possible:
• 00: Default mode; the appliance runs according to
control settings.
• 01: The appliance runs for 15 minutes at minimum
output. The display shows 2.F. When this service
function is aborted or has been active for 15 minutes,
the appliance reverts to default mode.
• 02: The appliance runs for 15 minutes at maximum
output. The display shows 2.F. When this service
function is aborted or has been active for 15 minutes,
the appliance reverts to default mode.
Default setting is 00.
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