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Re: need to set low level on my compressor
That would depend on the type of pressure control switch it had on it, but all of the ones I've ever seen have it near the high pressure adjuster under the pressure switch cover- VERY HIGH VOLTAGES- RISK OF INJURY OR DEATH- UNDER PRESSURE SWITCH COVER WITH UNIT STILL CONNECTED TO POWER-
On the common switch used (A condore mdr 5) the differential is adjusted by DEPRESSING the nob & turning it.
On MDR 4 the adjuster is directly behind the high pressure adjuster. it is a flat bladed screw attached to a spring-screw in to increase cut in pressure.
You can also get pressure switches with a higher cut in pressure.
In Australia from a company called Ross Brown Sales in N.S.W
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If compressor is not kicking in, low pressure will be too high. If Compressor IS kicking on, orifice tube may be blocked, or compressor may be bad. You need a full manifold set to work on AC, not just the gauge that comes on a refill can.
If the refrigerant level is low (or if it is too cold outside), the system pressure will not be high enough to cause the low side pressure switch to turn on the compressor. Check level of refrigerant by making sure there is at least 40 lbs pressure on the low side when the compressor is not running.
WILL FIRST YOU NEED TO SEE WHAT YOUR HIGH SIDE PRESSURE READINGS ARE ,COMPRESSOR MAY STILL CYCLE BUT FAST OFF AND ON DUE TO LOW FREON LEVEL,BUT IT STAYS RUNNING ALL THE TIME MAY HAVE FAULTY COMPRESSOR ,READ VALVES IN COMPRESSOR BAD ,BUT REC CKING HIGH PRESSURE FIRST,HOPE IT HELPS
Why does the power keep going off? You could bypass the relay live to the compressor and use a normal thermostat that doesn't need resetting, or just keep resetting the controller when you notice it's reverted to high setting.
Hello, You have two switches which work off the pressure of the Freon. Both of these switches cut off the power to the compressor. One is for HIGH pressure and the other is for LOW pressure. Check for power at the compressor clutch connector harness while the controls are set and the engine is running. You may have power and a bad clutch.
When you say that the Freon pressure is good, does that mean the pressure is within the proper range? Too much Freon will make the HIGH switch cut off power and too little will make the LOW pressure switch cut off power.
The ideal amount(ozs) of Freon is what is recommended by the Manufactuer and it will provide a moderate amount of pressure of about 35psi-40psi. You can borrow pressure gauges, called Manifold gauges to measure your system at autoparts stores with loaner programs.
The low pressure side of the system is the one you use to induce the Freon to go into an empty system. You can bypass this switch by taking off the connector and putting a "U" shaped jumper into the harness and the compressor clutch should get power to LOCK up all of the time.
You can take off the switch connector at the compressor clutch and then check for power when bypassing the HIGH pressure switch if the LOW pressure switch does not make the system get power. Only, really only bypass the HIGH pressure switch with the clutch connector disconnected. The HIGH switch is there to prevent damage to all of the components from seals to lines to every piece of Freon hardware in the car. Bypassing with the A/C clutch disconnected will allow you to know if power is getting to the compressor clutch.
Finally, you can get FREE wiring and fusebox diagrams through Autozone.com. Just sign and register to their site and then you can print the documents for yourself.
Good luck with this repair and I hope my solution helps you.
CHECK REFRIGERANT CHARGE. USING A MANIFOLD GAUGE SET. HOOK MANIFOLD GAUGE SET TO LOW PRESSURE PORT AND HIGH PRESSURE SIDE PORT. LOW SIDE PRESSURE SIDE SHOULD HAVE 25 - 36 PSI AND HIGH PRESSURE SIDE SHOULD BE 178 - 237 PSI. IF LOW SIDE PRESSURE SIDE READ BELOW 20 PSI THE LOW PRESSURE SWITCH WILL NOT TURN ON THE AC COMPRESSOR CLUTCH NEED TO ADD LITTLE MORE REFRIGERANT. IF REFRIGERANT LEVEL CORRECT CHECK AC COMPRESSOR FUSE AND RELAY.IF POWER GOING TO AC COMPRESSOR CLUTCH YOUR COMPRESSOR CLUTCH HAS OPEN WINDING. AC COMPRESSOR CLUTCH NEED REPLACING.
You need to hook up a gauge and read the pressures on the low and high side. It will cut out if the pressure drops too low or goes too high. If it was properly evacuated and charged I would assume it is probably high pressure cut out which would be indicative of a plugged orifice tube or restriction in the system (line, condenser, evaporator.
check the refrigerant level. The compressor is running until the low pressure or high pressure switch switch cuts it off.
Running the unit without enough refrigerant will damage the compressor because the lubricating oil is dissolved in the refrigerant. This is the reason for the low pressure switch cut off--to protect the compressor from damage.
If pressure gets too high, the compressor seals will blow. Thus the reason for the high pressure switch. Too much refrigerant or too much air in the system (due to a leak) will cause high pressures.
If refrigerant level appears to be correct, then suspect trapped air from a leak causing a high pressure cut-off. If refrigerant is low, suspect a leak causing a low pressure cut-off.
Need clarification... Does the compressor run steady, cycle on and off continually or even come on at all? If cycles on-off then attach charge manifold/gauge set and bring freon up to proper level. If does not come on at all, then start engine, turn a/c on, remove two-wire plug from low pressure cut-out switch mounted on accumulator. Jumper the wires at plug and see if compressor comes on. If so, bring freon up to proper level.
If charge level was low then check for system leak after system charge with an electronic leak detector if available.
If compressor runs but doesn't cool vehicle then with engine running and a/c on feel (carefully) the lines. High side line should be hot (be careful) and low side line should be cold. If these are both true then it's possible non-cooling condition is due to air temp diverter door not operating or heater valve not shutting off (if so equipped). If low side not cold it could be a plugged orifice tube. If high side not hot it could be bad rings on compressor. Both conditions can be diagnosed with a/c manifold gauge set by noting the pressures.
For safety... if not familiar with differences between hi and low side components or with charge equipment then please take vehicle to qualified person for service.