________________________________________________________________________________
64
AST 14 C 255/00
Tsbs < P19
or
Tscs > Tsbs -
∆
T OFF (P21)
If solar water heater temperature probe (SBS) is faulty, the function is not
performed.
WARNING: the water heater cooling function is normally disabled. Set parameter
P26 to 1 to enable it. Besides it is enabled only if either the “DHW ONLY”, or the
“DHW + CH” or the “CH ONLY” mode is selected in the boiler.
Solar collector anti-freeze
When the temperature read by the collector probe is lower than 4°C, the solar pump
PS is activated until the temperature reaches 5°C.
WARNING: the collector anti-freeze function is enabled only if parameter P24 is set
to 1, whereas the boiler mode has no impact over said function.
Solar plant characteristics with P17=2 and P18=1
Each time the solar pump becomes operational, its active state will be signalled
by the icon on the boiler display.
In case of fault of the solar water heating probe (SBS) or of the solar collector probe
(SCS), the solar pump is immediately switched off and the fault is reported through the
boiler board interface and the remote control (if connected) with the relevant error codes
(E28 and E24 respectively).
It is moreover possible to force solar charge during maintenance by setting parameter P25
to 1. In this way, the multifunction relay is energised until such parameter is restored.
PRESETTING FOR CONNECTION TO SUPPLEMENTARY BOARDS
One or more supplementary board(s) (max 4) can be connected to the boiler board for the
management of a zone system and of a solar plant.
In particular, besides the multifunction relay that can control the high temperature direct
zone (TA1), it is possible to install up to three supplementary boards for controlling the
equivalent number of mixed zones and one more board for managing a solar plant
(available in two configurations).
WARNING: the electric panel of the boiler is preset for housing up to two supplementary
boards (management of max. a three-zone system, or of a two-zone system plus a solar
plant). In the case of complex plants, where several boards need to be installed, these
must be located outside the boiler, arranging a special electric panel.
