________________________________________________________________________________
68
AST 14 C 255/00
(without external probe) according to the selected range. Parameter P39 displays
the calculated flow temperature, whereas parameter P40 the current one detected
by the boiler probe.
NB: with heat requests from different zones at the same time, the boiler flow set-point
corresponds to the highest of the calculated values. The flow set-point required by the
mixed zones is equal to the value calculated by the thermoregulation plus the value set by
parameter P75 (default 5°C).
When domestic hot water is drawn, heating requests are interrupted and then re-activated
when domestic hot water draw is finished.
Heating functions are disabled when the boiler is in the OFF or SUMMER ONLY modes.
Solar mode programming
The solar card allows for managing "complex" solar plants when two solar loads (pump +
deviating valve) are to be controlled, or when the multifunction relay is already used for
managing one zone of the system.
CONFIGURATION 1:
suitable only for “instantaneous”-type boilers (P3=1), where the "complex" solar plant to be
managed is designed for heating the solar storage in a forced circulation system through
the pump PS and for the instantaneous integration in the boiler for DHW through the
deviating valve VM.
Plant diagram is shown below:
