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Technical details
Adjustable parameters
2.6
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 con-
trol 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
demand. 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 defined using parameter 2AF for the time period which
can be set using this parameter for protection against legionella 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 out-
side temperature falls below the value set using parameter 19 (2BI) (minimum outside temperature). (see
diagram 2). If the OT bus sends a reference value to the firing device, this value is limited by the value set
using parameter 18.
Parameter 19 (2BI) - Minimum outside temperature - 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 param-
eter 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 being 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.
Summary of Contents for TopGas 30
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