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Frequently Asked Questions
Which decision is it making?
Whether running the pump is worth it.
It compares collector temperature.
With the bottom of the cylinder.
And circulates only when the collector wins.
By a meaningful margin.
What happens if it gets that wrong?
Heat is lost either way.
Circulating when the collector is cooler.
Pumps heat out of the tank.
And radiates it off the roof.
Not circulating simply wastes the gain.
Why are there two differentials?
So the pump does not chatter.
It starts at a larger difference.
And stops at a smaller one.
Without that gap it would cycle.
On and off around the threshold.
What does overheat protection do?
Acts when the tank is full and hot.
And the sun keeps shining.
Dumping heat or shutting down safely.
Rather than letting the collector stagnate.
Which damages seals and fluid.
What does frost protection do?
Circulates warm water to the collector.
When its sensor reads near freezing.
Trading a little stored heat.
For not replacing a burst panel.
It is a cheap trade.
Which component fails first?
The collector sensor, usually.
It sits in the harshest position.
Full sun, full cold, full weather.
And it fails quietly rather than stopping.
The controller then acts on a wrong number.
How does a sensor fault show?
As a system that stopped collecting.
Or one that runs at odd hours.
Both look like bigger problems.
Check the sensors first.
Before suspecting pump or collector.