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multifunction relay connecting diagram
3.6.6.
Solar collector anti-freeze function
Solar collector anti-freeze function is enabled by setting parameter P24 = 1. With this function, solar pump is activated as soon as solar collector
probe detects a temperature of 4° C
3.6.7.
Collector heat transfer function
This function prevents that solar collectors in stagnation state are exposed to high thermal stresses.
With the boiler in SUMMER, WINTER or CH ONLY mode, if the temperature read by solar collector probe is between 110°C and 115°C (editable with
parameter P22) and the temperature measured by the solar water cylinder probe is below 93 °C, solar pump is enabled to fill water cylinder. Solar
pump operation is disabled as soon as solar collector temperature goes below 108 °C or solar water cylinder probe detects a temperature above
95°C.
3.6.8.
Water cylinder cooling function
This function consists in cooling water cylinder down to the temperature value set by the user by transferring excess heat from the water cylinder
to the solar collector.
With the boiler in SUMMER, WINTER or CH ONLY mode, if water cylinder temperature is 2°C higher than set-point temperature and collector
probe temperature is 6°C lower than solar water cylinder probe temperature (editable with parameter P20), solar pump is enabled to cool water
cylinder. Function is interrupted as soon as water cylinder temperature reaches the set-point value set by the user, or when solar collector probe
temperature is 3°C lower than solar water cylinder probe temperature (editable with parameter P21). Function can be disabled with parameter P26
(P26 = 1 enabled; P26 = 0 disabled).
3.6.9.
Solar mode operation and failure signal
When solar pump is active, symbol (22, fig.1) appears on the display. If solar collector probe or solar water cylinder probe are faulty, error codes
e24 and e28 will be displayed, respectively. Solar pump will be turned off.
