How to increase pool heater capacity?

[Gary]

I recall back in the 1980's there was a heat pump which used an "A" coil in the outdoor unit... and under the A coil was a gas burner. I never actually saw one, don't recall who made it or know what happened with it... but it seemed like a good idea to me.

[desA]

Condesables can be proved to be in a system by turning it off for a while to cool to ambient temp. We assume that the refrigerant should be saturated in the system, which means that we have vapour and liquid present. We then can read off our guages to see whether the ambient temp lines up with our guage pressure/ temp. If there is air in the system we what have the sum of the refrigerant and the air pressure which would be higher.
We also use this test to confirm what refrigerant is in a cylinder. This has become a bit difficult with the new refrigerants, but it gives us an idea. The only way to remove air in a system is to reclaim and evacuate.

Thanks very much for that information - very useful to know.

[Drew]

After my boss sent the suppliers a letter asking them to explain where they got the NOM capacity from they have agreed to replace the pool heater with a unit that is 2 sizes up!!

[desA]

Now, isn't that what some of us have been saying all along?

Nice to see it's sorted out...

[Gary]

But it isn't sorted out. We will probably never know why it wasn't working properly.