Baxi LUNA HT 1.280, Installation, Operation And Maintenance Manual

Page: 94 / 144

Leading source
(3544)
The setting of the leading source is only used in combination with the fixed se-
quence of the source sequence (prog. no. 3540). The boiler defined as the leading
boiler is always put into operation first, and switched off last. The other boilers
are switched on and off in the sequence of the device address.
Return setpoint min
(3560)
If the return temperature drops below the return setpoint set here, the return
maintenance is active. The return maintenance enables influences on the consu-
mers or use of a return controller.
Temp differential min
(3590)
This function prevents too high cascade return temperatures and improves the
switch off behaviour of the cascade. If the temperature difference between the
flow and return sensor is smaller than the minimal temperature spread set here,
a source is switched off as early as possible independently of the set lead strate-
gy. If the temperature difference is again sufficient, the set lead strategy is again
switched to.
Solar
Temp diff on
(3810)
Temp diff off
(3811)
The switching-on and switching-off point of the collector pump is set with these
functions. Basis is the temperature difference between collector temperature and
storage temperature.
Fig. 23: charging control /schematically)
Tcol
Temp diff on
Temp diff off
Tcmin
On
Off
TSt
ON / OFF Collector pump
Tkol Collector temp
TLmin Charging temp min buffer / swimming pool
TSp Storage temperature
Charg temp min DHW st tank
(3812)
Zusätzlich zur Temperaturdifferenz ist das Erreichen einer bestimmten minima-
len Kollektortemperatur für den Speicher-Ladevorgang notwendig.
Programming
94 358 436 08.10