Question about Federal Equipment 12HP 20 Psi Hobby Air Compressor - HS201

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I need the best compressor for a refrigerant cycle

I'll use 15 psi of a pressure

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Please provide more details

Posted on Jul 23, 2009

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When i turn on the a/c,the compressor does not work


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.

Aug 11, 2011 | 1997 Nissan Pathfinder

1 Answer

Need location for 2003 Pontiac Montana AC low pressure switch


Hello, this vehicle doesnt use a cycling switch. it uses a pressure sensor. this compressor runs all the time. there is a expansion valve that controls the amount of freon entering the evap core. here is how the compressor uses a pressure senor

The A/C refrigerant pressure sensor is a 3-wire piezoelectric pressure transducer. A 5-volt reference, low reference, and signal circuits enable the sensor to operate. The A/C pressure signal can be between 0-5 volts. . When the A/C refrigerant pressure is low, the signal value is near 0 volts. When the A/C refrigerant pressure is high, the signal value is near 5 volts.
The A/C refrigerant pressure sensor protects the A/C system from operating when an excessively high or low pressure condition exists. The PCM disables the compressor clutch under the following conditions:
• A/C pressure is more than 2979 kPa (432 psi). The clutch will be enabled after the pressure decreases to less than 1620 kPa (235 psi).
• A/C pressure is less than 179 kPa (26 psi). The clutch will be enabled after the pressure increases to more than 207 kPa (30 psi).

Jun 08, 2011 | 2003 Pontiac Montana

1 Answer

Where is the ac lowside port located on a 2005 gmc savanna van


The low side port of the 2005 GMC savanna Van is located on the low pressure side of the compressor.

This is found by locating the compressor driven by a belt that has a clutch that engages and disengages as the a/c cycles.

The low pressure piping is always in the larger diameter piping, and the high pressure side is always contained in the smaller diameter piping.

Therefore, follow the thick pipes from the compressor up to the accumulator, which looks like a large can of soup. On the accumulator receiver/drier is a port that connects to the tube that is connected to the can of r134a freon refrigerant.

Simply quick connect the tube to the low side port, which is located on the 'thick' tubing or on the accumulator and then fill until the low side pressure is 25 psi to 45 psi while the compressor is running.

When the car is off and the compressor is not running, the pressure should be 75 psi to 100 psi on a hot day.

Hopefully the system doesn't have a leak slow or fast in it.

Aug 17, 2010 | 2005 GMC Savana

2 Answers

A/C compressor kicks on and off rapidly and if car is idling it will cut off because of the draw off the engine from the compressor. Any suggestions would be great. Dealership could not find any problems....


It sounds like a bad AC Compressor Control Relay. It could be the compressor itself. In any case, here is a link to AutoZone's site with the A/C parts for the specific make and model of your car.

Good Luck ;)

Apr 03, 2010 | 2004 Chevrolet Impala

1 Answer

My motor compressor thrifts every 5 mins.


If you have a low pressure switch on your air conditioner it's opening and closing, because you don't have enough refrigerant in the system or it's cycling on the thermal overload in the compressor because it's getting hot.
You need to charge your system to approximately 12° to 15° superheat not by pressure.

Mar 23, 2010 | LG LB8000ER Air Conditioner

2 Answers

I HAVE A PIECE OF EQUIPMENT THAT RUNS AT 75 PSI. I NEED TO BUY A COMPRESSOR THAT WILL HAVE A DUTY CYCLE OF 50%. HOW CAN I SELECT WHAT SIZE COMPRESSOR I NEED?


That is an extremely high pressure. I would firstly check to make sure that THAT is what you need, then MOST compressors have a regulator where you can adjust the pressure required.
It is not so much the pressure you need as the STORAGE of air that you need for a pressure that high. MOST tanks are around the 20 or so litre. To utilise a tool requiring the pressure of 75PSI I suspect you would need a tank of somewhere around the 2-300 litre size or maybe even bigger. But first just make sure that you DO need the 75PSI you mentioned.

Feb 10, 2010 | Air Tools & Compressors

2 Answers

GE GSF25XGR Everything seems to be functioning properly, compressor is running. have supplied freon but its not moving thru the lines.


you mean, it where not able to completely frozen the layers?

if that is the case then your Freon charge might be under charge, it should be atleast 18 to 20 psi the backl pressure of your freon charge when it is running and it can only be measured using gauge manifold, your technician should know about it.

worst case scenario is your compressor might be Loss Compression (mechanical failure) Yes it is running but it cannot make pressure (valve problem)

Nov 08, 2009 | GE GSF25XGR Side by Side Refrigerator

1 Answer

Have a 2003 stratus with intermittent A/C works great when on, where is the pressure sensor located?, that may be problem


On this Chrysler product they have an A/C Transducer located on the high pressure hose. The switch has three wires. They also have a thermo sensor located at the evaporator case behind the glove compartment. These two things are the only ones thatA jump in the system is only removing protection the system has. So it will damage your compressor or hoses. Find the compressor follow the high hose to the high pressure switch (transducer) it has three wires. Check under the dash by the glove box and you will see a round platick lid on the case with two wires that is your thermostat (thermo sensor).
control the compressor.

The A/C clutch is controlled by the A/C cycling switch (19E561) and the A/C pressure cut-off switch, which are connected in series. The A/C cycling switch is mounted on the suction accumulator/drier (19C836), and the A/C pressure cut-off switch is mounted in the discharge line at the A/C condenser.

The A/C cycling switch closes when the pressure on the low side of the system reaches approximately 276-324 kPa (40-47 psi). The A/C cycling switch opens when the pressure drops to approximately 163-175 kPa (23.5-25.5 psi), disengaging the A/C clutch. In ambient temperatures below -1° C (30° F), the A/C cycling switch will not allow compressor operation because of low system pressures.

The A/C pressure cut-off switch is used to interrupt A/C clutch operation in the event of high system discharge pressures. The A/C pressure cut-off switch is a single-function switch that controls A/C clutch engagement. When compressor head pressures rise to approximately 2896 kPa (420 psi), the contacts open, disengaging the A/C clutch. When the pressures drop to approximately 1724 kPa (250 psi), the contacts close to allow A/C clutch operation.

This problem can be caused by low refrigerant charge. Check with a manifold gauge set and temperature pressure chart.
The cycling switch is replaceable and there is a Schrader valve on the accumulator port so you do not lose your system charge when replacing. It screws on/off. It is available at any auto parts store. It protects the compressor from low pressure which can be caused by a loss of refrigerant and subsequent lack of lubrication and prevents evaporator freeze up. Replace the switch. It is about $10. The high presure switch is about $25.

Aug 26, 2009 | 2003 Dodge Stratus

2 Answers

96 Tahoe no Cold Air


YOU NEED 28 PSI ON LOW SIDE AND ABOUT 190 ON HIGH SIDE.YOUR REFRIGERANT IS LOW THAT WHY COMPRESSOR CYCLING ON AND OFF.

Jul 22, 2009 | 1996 Chevrolet Tahoe

1 Answer

Air compressor motor stalls under pressure


this sounds like a bad pressure switch.if the unit is not shutting off at the same pressure each time this would be the cause.2 if the pressure is not unloading the air pressure on the compressor side of the unit it will cause the unit to struggle when it starts a cycle because the piston is under a load .how this works is say the unit starts from 0 psi when it get to the desired pressure you have it set on the unit kicks off . the other adjustment most units have on them is what pressure to cycle back on.so when the unit reaches say 100 pounds ,it kicks off and bleeds the air off the compressor side so when it starts back up it wont start up with pressure on the piston.

Jun 18, 2009 | Air Tools & Compressors

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