Will not auto recharge properly

This is an easy fix.. you need an new safety valve or a new switch.

If the safety valve releases pressure before the max pressure replace it.
the switch has a cut in pressure of 120 psi (this means compressor will start when pressure falls to 120 psi.
The cut off pressure is 150 psi. This means the unit will shut off at 150 psi.
You need to watch supply pressure to see if it exceeds 150 psi. If it does replace switch.


Safety Valve Part Number:AB-9415379
Pressure Switch Part Number:AB-9415626

Replace valve.Is the 45 psi in the tank or the regulated pressure that happens to 45 psi?
Part 14
https://www.ereplacementparts.com/valve-safety-175-p-58678.html?osCsid=v6l1omob7oegoo1c7sibbsu5h3

The pressure switch is either out of adjustment or has failed. The compressor should shut off at a much lower pressure than the safety valve (~100 psi)

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/dave_fb2c45146b845cea

The maximum pressure on most small compressors is 10 bar or 1000kpa which is about 145 psi in the old language most safety valves are set to 150 psi. I suggest you get some one to reduce the pressure switch setting. Running a compressor at elevated pressures does not give you any more air. A reasonable pressure for small compressors is 120 psi

I would guess from the info supplied that the pressure switch is shutting it down at 125. Most piston type compressor only pump a max. of 175 unless it is a special high pressure unit. Also it may be shutting down on high amps, high temp etc.However with all that said Piston units are positive displacement, meanning that it should pump until something gives. Start your unit, close the discharge air valve and see what it pumps up to. May have to adjust pressure switch to get over 125. If unit runs and runs and just will not go over 125, you probably have a valve going bad. Do you have a safety lifting. if so another indication of a bad valve.

There is a small valve on the pressure switch that should relieve the pressure between the compressor and tank check valve. Make sure when pressure switch trips, it engages the relief valve and it bleeds the air out. Sometimes the valve itself comes loose and is not engaged by the lever in the pressure switch.

Hi!

If by red lined you mean it went over the 250 psi range??

Assumiing that the answer is yes. This is what I think.

The Hi and Low pressure switches prevent damage to the compressor if the pressure is out of range.

Before going any further, check A/C Relay and fuse.

With the engine off, check pressure on both, Hi and Low. Both gauges must have same reading. It should be between 175-200 psi at about 80 degrees temp., if pressure is over that range, the Hi Pressure switch is preventing the compressor clutch to engage, gas needs to be removed by a qualifying A/C Technician.

If Pressre is between range, and both gauges read the same, start engine and turn compressor on, check gauges, The Low side should read about 38 psi and the Hi side should be between 250/275.psi.

Any more trouble shooting should be performed by a Qualified Tech.

Don't forget to rate this post!! Good Luck!!

to repair this problem (a) the pressure switch is not working,(b) check valve or non return valve sticking(stripe down repair and refit)

what is the working pressure bud

We have a Westinghouse 3YC air compressor. The safety relief valve in the line between the two compressors started "popping off" recently. The compressor seems to be working fine. Is this a problem only with the relief valve or could there be a symptom of a more serious condition that we should be attending to? The valve is stamped 60 max which I assume is 60 psi. Is this the correct size. The tank pressure is set for125 psi. The tank relief valve is marked 250 max.