Baxi LUNA HT 1.280, Installation, Operation And Maintenance Manual

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Pumpmodulation
(2320)
- None : the function is switched off.
- Demand : Actuation of the boiler pump occurs with the speed calculated for the
DHW pump during DHW mode or with the highest calculated speed for the
max. 3 heating circuit pumps during pure heating mode.
The calculated pump speed for heating circuit 2 and 3 is only evaluated if these
heating circuits are also dependent on the setting of the diverting valve (Para-
meter boiler pump/DHW diverting valve control ).
- Boiler temperature setpoint : The boiler pump modulates its speed so that the
current setpoint (DHW or buffer storage tank) is achieved on boiler flow. The
speed of the boiler pump must be raised within the specified limits until the
burner has reached its upper output limit.
- Temp differential nominal : The boiler output is controlled to the boiler setpoint.
The control of the pump speed controls the speed of the boiler pump so that
the nominal rise between the boiler return and boiler flow is held.
If the actual rise is larger than the nominal rise, the pump speed is increased,
otherwise the pump speed is reduced.
- Burner output : If the burner is operated with low output then the boiler pump
should also run on low speed. During high boiler output the boiler pump should
run on high speed.
Pump speed min
(2322)
For the modulating pump the working range can be defined in percent of output.
The control translates the percent data internally into speeds.
The minimum value should be chosen so that the pump is reliably activated du-
ring actuation.
Pump speed max
(2323)
The power consumption can be limited via the maximum value.
Output nominal
(2330)
Output basic stage
(2331)
The settings under prog.no. 2330 and prog.no. 2331 are necessary when setting
up boiler cascades with boilers of different power.
Output at pump speed min
(2334)
Output at pump speed max
(2335)
If under the prog. no. 2320 option burner load is selected, the boiler pump is ope-
rated up to the set burner load under prog. no line 2334 to minimum pump
speed. from the set burner output set under prog. no. 2335 the boiler pump is
operated on maximum pump speed. If the burner output lies between these two
values, the pump speed for the boiler pump is given by linear conversion.
Max fan output heating ope-
ration
(2441)
With this parameter the maximum output can be limited in heating mode.
Max fan output heating full
charging
(2442)
With this parameter the maximum output can be limited in full charging mode.
Fan output DHW max.
(2444)
With this parameter the maximum fan output for the DHW mode can be restric-
ted.
Programming
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