Bosch ZBR16-3A Series Installation And Service Instructions Manual page 61

Service function 3.b: Set anti-cycle time
Only if the automatic anti-cycle time is disabled (service function 3.A)
will this function be active.
If an outdoor reset control is connected, there is no need
to adjust this setting on the appliance.
The control automatically optimizes the anti-cycle time.
The anti-cycle time can be set from 00 to 15 (0 to 15 minutes).
With 00, the anti-cycle lock is switched off.
The shortest possible switching interval is 1 minute (recommended for
single zone or forced air heating systems).
Default setting is 03.
Service function 3.C: Switching differential
Only if the automatic anti-cycle time is disabled (service function 3.A)
will this function be active.
If an outdoor reset control is connected, there is no need
to adjust this setting on the appliance.
The control automatically optimizes this setting.
The switching differential is the permitted boiler differential from the
target supply temperature. It can be set in increments of 1 °F (0.5 °C).
The minimum supply temperature is 95 °F (35 °C).
Service function 0.E is set to 00 (metric units):
• You can set the switching differential between 00 and 30 (0 - 30 °C).
Service function 0.E is set to 01 (US-customary units):
• You can set the switching differential between 00 and 54 (0 - 54 °F).
Default setting is 18 (18 °F (10 °C)).
Service function 3.d: Minimum output (heating and DHW)
The output for heating and DHW can be set to any level in percent
between the minimum and maximum nominal output.
The default setting is the minimum nominal output (heating and DHW)
and varies according to appliance.
Service function 3.E: Cycle time, keeping DHW hot (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 service function is only active in comfort mode.
It specifies the time from completion of preheating or DHW demand until
the next time the plate-type heat exchanger is heated up. This prevents
the plate-type heat exchanger from overheating.
The cycle time can be set from 20 to 60 minutes.
Default setting is 20 (20 minutes).
Greenstar
Heatronic boiler control settings | 61
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.
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
6 720 806 992 (2015/03)