[snip]
Might come in handy, played around with some heat pump hot water systems today.Never worked on one before.
Surprisingly,an old dog can sometimes learn new tricks.
So at this site they had 10 out of 12 not going.When we had finished, they had 8 not working so that's an improvement.

The others need parts,capaciters,PCB's,and compressors.
They are back ups for the gas hot water systems.The gas ones trip out each time the power goes off or if there is a fire alarm, then have to be manually re set.
So the Heat pumps have been added to take over when the gas ones fail.They are around 10yrs old.
Quite large commercial systems, run on R134a,use a scroll Mitsy compressor with R407C stamped on it,liquid injection, de ice, etc.
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