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Thread: Radford Scroll Pack - HP switch?
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06-11-2013, 03:44 PM #1
Radford Scroll Pack - HP switch?
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.
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Re: Radford Scroll Pack - HP switch?
Check the electrical schematic. Perhaps you're correct! I assume you followed the highside piping and checked the control circuit?
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07-11-2013, 07:08 AM #3
Re: Radford Scroll Pack - HP switch?
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?
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14-01-2014, 10:11 PM #4
Re: Radford Scroll Pack - HP switch?
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