Radford Scroll Pack - HP switch?

[TaffyLad]

Can't find a HP cut-off on a Radford HT scroll pack (R404a). Any ideas if it's placed somewhere unusual? Or is it possible they were installed without a mechanical HP switch? It was installed in '97.

[passandscore]

Check the electrical schematic. Perhaps you're correct! I assume you followed the highside piping and checked the control circuit?

[TaffyLad]

Yes mate, checked everywhere around the pack. All the pressure switches on the high side just controlled the condenser backup.

I thought, or perhaps assumed, it were a legal requirement to have a mechanical HP cut off on systems this size?

[ABZ]

hp setting sometimes controlled by elm/rdm controller via pressure transducer,forcing pack into standby mode.
you will find compressors are fitted with fixed hp switches