Spectrum Energy Solar Controller by Delta Sol

This Spectrum Energy Controller is based on an old Resol Deltasol unit.

It is simple and reliable and has been produced by Resol with a number of companies adding their branding to it.

The central round dial, when turned, will either display the solar collector(s) temperature, the temperature at the bottom or the top of the cylinder. It will stay displaying the temperature until the dial is moved and not default back.

There is a 3 position switch on the left outer side which allows operation in manual ON or OFF, but should be left in the central position in AUTO.

In normal operation you can expect to see a green light.

A red light indicates a fault, or that the controller is set in manual override.