Danfoss DHP-AQ 16kW Motor Protection Unit (Overload Relay)

[Worcester]

It says the compressor is rated 5.5kw at 230v single phase. which is 23.9A.
The lrd22 goes from 16-24A and the lrd32 is 23-32A.
I think its lrd22, but i would take one of each if not 100% sure.

That was my calcs as well, I was trying to avoid having both !

The compressor will be causing the correct operation of the overload hence the overload is doing its job. I have replaced loads of compressors on AQ air source and every other thermia product.

Danfoss have no direct provision for support in the UK, it's contracted out to a third party.
My feeling has been that this site (and another one that is also giving us loads of faults) has a failing compressor, though the local support agent, says that failures of compressors are very rare.
So interesting to hear your comments

But like with any compressor change, all contactors,capacitors etc need to be replaced to give reliable service. But with a small domestic unit and domestic environment cost is always an issue

Yep that would be our process as well, spend and get it fixed now rather than chasing tail with other failing components later