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Message: [QUOTE="Garbage_Mechanic, post: 1227453, member: 1610"] Billy, The switch pressure specs for the low side switch are set up to protect the compressor from low freon charge and normally do not come into play. If this switch is causing the compressor to cycle, the system is low on freon. The high pressure specs quoted are for the stock high pressure switch. Remember this switch is also set up simply to protect the compressor. Remember the switch you replaced it with has a cut out for high pressure like the original and then a seperate switch to operate the engine fan. The setting of the engine fan cut in might be too low if it operates the fan too often. This set up to use high pressure to operate the engine fan is very common with heavy trucks. There has to be various settings avalable. Red Dot and Kaysor make a lot of the switches for the HD market. This would be what they call a binary switch. Another posibility is a time delay circuit. There arent uncommon in refuse trucks for other than AC but could still be used. What if the compressor didn't come on until 15 or 30 seconds after reaching the high pressure setting of the switch? [/QUOTE]

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