Baxi MULTIFIT Evacuated Tube Collector Kit Instructions page 40

Indication
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40 © Baxi Heating UK Ltd 2011
14.0 Commissioning of solar controller
14.18 Flow monitoring
If the energy productivity measurement option is deactivated,
the temperature difference between collector and storage tank
is checked.
If it exceeds the amount of (60K + dTmax), it is then
interpreted as an error because in the case of normal system
dimensioning and a pump switched on such large differences
cannot take place.
If the energy productivity measurement option is activated, the
flow amount when the pump is switched on is checked. If for
15 minutes no flow is recognised it is evaluated as an error.
Error message is automatically reset after eliminating the
failure.
Meaning
Missing circulation in solar circuit
14.19 System protection function
The system protection function switches the system off if the
"maximum collector temperature" is exceeded by 10K. As
soon as the temperature drops below the "maximum collector
temperature", the system is started up again. This function has
higher priority and is always active, regardless of whether the
collector protection is on or off.
14.20 Frost protection
This function can be switched on/off in the "Basic adjustments"
menu, point 11 and the start temperature can be adjusted in
point 13. Furthermore, a frost protection sensor can be
selected (T1-T6, point 12).
If the measured value is lower than the start temperature, the
solar pump is activated until the adjusted frost protection start
temperature +5K is reached. The minimum runtime of the
pump is 5 minutes.
For security reasons the function is deactivated if the
temperature of the priority storage falls below 5ºC.