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Today we used the infrared camera to study the water flow in the solar thermal pool heating system.
We found a three way valve that opens on control to enable the flow from the main Pool pump to flow through the solar thermal system.
Our suggestion is to check the values of the thermistors running the control unit. We believe the system is running at night, which could be caused by a defective sensor.
IR photos:
Hot return from solar array, temp is 94°F
Valve closed:
Possible valve block or loss of return pressure:
Bypass valve:
Solar return, manual override, note temp of over 100°
More return, solar collectors appear to be functioning properly:
Possible system block, valve open, hot water not returning:
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