Alpha Solar SolaStat-Eco Instrukcja instalacji - Strona 4
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Drukuj stronęSolaStat-Eco Users Guide.
Your SolaStat-Eco has a microcomputer at its core that intelligently and automatically controls
your solar hot water system at greater efficiency. The SolaStat-Eco measures water temperatures
at 2 different places in the system and turns on a water pump at the optimum time. The pump
moves hot water from the solar collector into the hot water tank.
The SolaStat-Eco has advanced features that; protect the system from damage, run self diagnostics,
self correction of some problems and will keep you informed as to what the SolaStat-Eco is
measuring and what decisions it is making.
Principle of operation:
The solar hot water panel sensor is called
The lower hot water tank sensor is called
The SolaStat-Eco is a differential solar hot water controller. The controller measures the temperature
at the 'Roof' sensor and compares this to the 'Inlet' sensor. If the difference between the roof and
the inlet is greater than the programmed upper limit (typically 12C) then the pump turns on and
transfers heated water from the solar collector to the tank and replaces this with cooler water from
the bottom of the tank. When this happens the tank heats up and the collector tends to cool down.
The heat difference is reduced to a point where the lower limit (typically 6C) is reached and the
pump turns off. This cycle repeats as long as the sun shines and there is a difference in temperature,
the tank heats up progressively this way.
There is a huge amount of energy in sunshine, as high as 1000 watts per square metre. This can
lead to water temperatures present in the hot water tank beyond what it is designed to handle
(close to boiling). This is especially true of 'ceramic' lined tanks. Also pressure can build which can
cause other plumbing problems. To protect the hot water tank and stop pressure problems a
maximum temperature can be set called 'Topout'. This will prevent the pump from moving any
more water from the collector until the tank has cooled to a safe level.
To protect the solar collector from freezing in mild frost areas the 'Frost' function can be enabled.
This will turn the pump on to move a small amount of water through the collector. Heavy frost
areas may need other solutions such as glycol based systems or drain down.
The SolaStat-Eco has other special features to those mentioned above.
Pump Timer: This is an optional factory setting to assist in pump cavitation recovery. After
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the pump has run continuously for approximately ten minutes, it will turn off for one minute. This
cycle is repeated as long as the pump is required to run and will not affect normal operation in a
standard hot water collector and cylinder installation. The one minute turn off period helps any
accumulated air to escape from the pump and has been effective as a backup in exceptional
conditions. This feature can help prevent the pump running for hours in a 'locked up' state, in-
creasing the installation reliability. Also refer 'Plumbing Issues, Cavitation'
NOTE: The Pump Timer is OFF in the SolaStat-Eco-P (Pool) version.
20 DegC lockout: If the collector is less than 20C it will not contribute any useful heat, even
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to cold water. Therefore the controller will not turn the pump on under differential conditions ('frost'
protection still works).
Sensor diagnostics: The SolaStat-Eco constantly checks the sensors. If the roof sensor is
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above 140C, the pump is disabled. If a sensor is outside the specified temperature range of -40C
to 150C then the display flashes the 'Topout' light for the Roof sensor and flashes the 'Frost' light
for the Inlet sensor and the controller enters Smart Shutdown mode. The sensor has either a
slowly flashing light for a temperature above 150C (possibly shorted sensor or wire) or a fast
flashing light for a temperature below -40C (possibly open sensor or broken wire). For example if
the 'Roof' sensor wire is cut during some building work then the SolaStat-Eco 'Topout' light flashes
fast and the controller enters Smart Shutdown mode until the wire is repaired.
Smart Shutdown (SSd): In Smart Shutdown mode, the 'Topout' and or 'Frost' light is flash-
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ing and the pump is disabled except for 'Frost' protection when the Roof sensor is working.
'ROOF'
'INLET'
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