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TECHNICAL INFORMATION
3.6
Adjustable parameters
Parameter 7 (2AH)
– Set point DHW charging temperature –
Using this parameter the reference value for the DHW
temperature can be set where there is no room control
unit or other regulatory device installed. If a reference
value is transmitted via an OT bus, the latter (value via
OT) will always override this parameter.
Parameter 8 (2AI) – Pump after-run time (DHW) –
During the time which can be set using this parameter
the pump continues to run after a phase of hot water de-
mand. The after-run time occurs before a switchover to
heating operation as well as before a switchover to to
stand-by mode (to be set at the RS-OT or control unit) or
when the firing device is switched OFF. It also occurs of
course when the desired DHW value has been reached
and further heating operation is not required.
Parameter 9 (2AJ) – Legionella protection time –
The boiler is periodically heated to the temperature de-
fined using parameter 2AF for the time period which can
be set using this parameter for protection against le-
gionella infestation. If the parameter value is set to 0 the
legionella protection function is deactivated.
Parameter 10 (2AK)
– Maximum fan speed in DHW mode –
The parameter defines the maximum rpm value for the
fan during DHW operation.
Parameter 18 (2BH)
– Maximum heating temperature (when minimum outside
temperature has been reached) –
The value which can be set here determines the flow
temperature which is to be achieved when the outside
temperature falls below the value set using parameter
19 (2BI) (minimum outside temperature). If the OT bus
sends a reference value to the firing device, this value is
limited by the value set using.
Parameter 19 (2BI) - Minimum outside temperature -
This parameter defines the minimum outside temperature
which marks the limit where the flow temperature target
is to be set at the temperature given by parameter 18
(2BH).
Parameter 20 (2BJ)
– Minimum heating temperature (when maximum outside
temperature has been reached) –
If the outside temperature sensor registers the value set
using parameter 21 (2BK), then the system targets the
minimum heating temperature set using this parameter.
If the outside temperature exceeds the parameter value,
the heating demand is cancelled.
Parameter 21 (2BK) – Maximum outside temperature –
If the outside temperature exceeds the values set using
this parameter, the heating demand is cancelled. At the
point where the parameter value is reached the system
targets the minimum heating temperature which has
been set using parameter 20 (2BJ).
Parameter 22 (2BL) –Restart delay following temperature
blocking in heating operation mode –
When the boiler is shut down on account of a temperature
limit being exceeded, i.e. a set point plus offset, the boiler
restart is delayed for the period which can be set using
this parameter - irrespective of whether the hysteresis set
for the next heating demand has expired or not.
Parameter 23 (2BM) – Restart delay following heating
demand during heating operation –
Immediately following the end of a heating demand phase
boiler restarts are delayed. That is to say, if the boiler is
shut down on account of a reference value trigger be-
ing sent from the OT bus to the firing device, a restart
(triggered by another reference value being reached) is
delayed for at least the period of time which can be set
using this parameter.
Parameter 24 (2BN)
– Pump after-run time (heating operation –
During the time which can be set using this parameter the
pump continues to run after a phase of heating demand.
Parameter 25 (2BO)
– Maximum fan speed in heating operation mode –
This parameter is used to set the maximum permitted fan
speed in % in heating operation mode.
Parameter 60 (2GE)
– Waiting time after opening main gas valve or activation
of combustion chamber ventilator –
After a burner demand is received, the boiler start is de
-
layed by the amount of time set using this parameter.
While this time elapses the display shows the digit ‘0’.
The interval is required for the main gas valve to open or
for pre-ventilation via the combustion chamber ventilator.
Parameter 61 (2GF)
- External main gas valve (possibly an LPG valve) / com
-
bustion chamber ventilator present –
This parameter is used to indicate whether an external
main gas valve or a combustion chamber ventilator is in-
stalled.
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