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58
AST 14 C 257/00
•
P17=2 Solar reference:
BOILER INTEGRATION
(P18=0)
The diverting valve (VM) of a solar panel system is handled:
This function consists of controlling the motorised valve VM, via the multifunction relay,
and activating the boiler burner only if the solar tank heater temperature is unable to meet
the operating request.
This valve is controlled via a solar tank heater probe (SBS) at the tank heater outlet.
The VM valve remains off-state (boiler integration) when the temperature read by the SBS
probe is lower than the DHW set-point temperature less 2°C. It is powered on (solar only)
when the temperature of the solar tank heater probe reaches the DHW set-point set on the
boiler, or if the probe is faulty.
When the VM valve is in the solar only position, the boiler cannot operate in DHW mode.
Important. This function is only active if the DHW+HEATING, HEATING ONLY or DHW
ONLY operating mode is set on the boiler. With the boiler OFF or in ANTI-FREEZE mode,
the VM valve is always powered on.
Any probe faults are shown on the boiler interface or the remote control, via error code
E28.
21 22 23
21 22 23
Electrical connections:
VM
TANK HEATER
SOLAR PANEL
MAINS WATER
SUPPLY
Double-acting valve
Single-acting valve
neutral
in the boiler
to the collector
neutral
to the collector
