EcoSolar Energy Conscious Design Limited
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The monitoring of the water temperature in the top of the cylinder is a beneficial feature as it allows
the user to more closely manage the water temperature in the cylinder, being more informed about
how much hot water is available and whether the backup heating should be initiated, see section
below on “Existing hot water cylinder heating source”. This controller is installed in cylinders that
must have their maximum temperature limited, such as lined steel mains pressure cylinders.
Figure 18 EcoSolar ESR21 R3 controller
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UVR-61R3, having all the functions of the ESR21-R3, this controller is able to monitor 6
temperature sensors and can also monitor an EcoSolar solar radiation sensor. This controller can
control up to 3 solar systems allowing the solar collectors to heat up to 3 hot water cylinders,
swimming or spa pools. Multiple arrays of solar collectors in different locations can also be
controlled, such as when collectors cannot be installed facing North and are instead installed facing
East and West. The controller has an internal daily timer which is able to control 3 outputs, this
function is often used to automate the backup heating. The controller will determine if there is
sufficient hot water available at a predetermined time of day and automatically turn on and off the
heating as required. The 6 sensors are able to be data logged via the optional D-Logg which can
download through a USB port to a computer, providing daily graphs of the data and system
performance and can also be exported in to Microsoft Excel.
