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Thread: operation of oil switch
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06-03-2007, 03:49 AM #1
operation of oil switch
hello . I once knew how an oil pressure differential switch work..could someone tell me again how it works both mechanically and electrically ..the aid of an electrical hook up is appreciated
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06-03-2007, 09:20 PM #2
Re: operation of oil switch
Hi Chabby
The oil pressure switch is a safety device to protect the compressor.
At switch on it will allow the compressor to run for a set time, say, 60secs, 90secs or 120secs, during which time it is looking for a differential in the oil pressure.
When a voltage is applied to the switch, a small heater is energised that will run for the set time (above) before breaking the compressor control circuit.
If a dp is available on the system (i.e. good oil pressure) then the bellows pressure operates another relay which bypasses the heater contacts and allows the compressor to run.
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06-03-2007, 09:31 PM #3
Re: operation of oil switch
I tried to edit my previous post but it wouldn't reload.
have a look here http://www.danfoss.com/Products/Prod...%26dyn_lang%3d
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07-03-2007, 01:54 AM #4
Re: operation of oil switch
thanks very much Frank....the info helped..