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We have a compressor as listed above (air cooled version) and have had a problem that has crept up gradually over the last couple of months.
When switching to load the compressor does not respond and can take between 2 and 25 minutes to actually show pressure on the gauge.
Prior to switching to load there is zero pressure on the gauge .
We have performed checks on the solenoids and the pressure switch and the unit runs fine all day it's just start up.
Also it seems that the colder the temp the longer it takes to get pressure up.
I am an apprentice covering for the boss while he has an operation, we are trying to avoid having the Atlas Copco guys in for a look at this stage as they want $2000 before they even open their toolbox.(we are out in the stix)
Any advice appreciated.