Bosch ZBR16-3A Installation And Service Instructions Manual page 69

Service function 3.A: Automatic anti-cycle function
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.
Use service function 3.A to set the automatic adaptation of
the anti-cycle time. This can be required in case of
unfavorably-dimensioned heating systems. Short cycling
may increase boiler and system wear and tear, increase
emissions, reduce comfort, and should be avoided.
With auto-adaptation of the anti-cycle time disabled, the
anti-cycle time must be set using service function 3.b
( page 69).
The following settings are available:
• 00: Automatic adaptation of the anti-cycle time is
disabled
• 01: Automatic adaptation of the anti-cycle time is
enabled
Default setting is 00 (switched off).
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.
Copyright (optional information)
Heatronic boiler control settings | 69
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!
B 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).
6 720 643 068 (2011/06)