Question about Square D FSG2J24M4CP Water Pump Pressure Switch with LowPressure Cutoff

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How do you set the water well pressure switch so that it does not cycle from low pressure to high pressure? Can you not set it to where you have good pressure all the time when watering the yard?

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There will usually be a difference in water pressure between the pump cycling on and off. The larger, spring loaded nut near the end of the case is the shut off adjustment. The small spring loaded nut next to it is for setting the differential between the stopping point and when the pump will restart. Getting these two points as close as possible will minimize the pressure differential while doing yard work but short cycling is not good for motors of any kind.

Posted on Mar 31, 2011


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Water pressure tank. Cycles on and off every few seconds with water running. How can I test to see if the float is good or bad to get the air the tank needs. Thanks

Hi Robert:
Since it's cycling every few seconds, I'd be looking for one of two problems, either the pressure switch, or lack of air in the tank.
There should be a pressure guage on the tank, and the pump should have a low pressure start and a high pressure stop.
I'm not familiar with the "float" that you're referring to.
I would shut off the power to the pump and close the valve from the tank to the outlet line. Then I'd drain the the tank so that I knew there was lots of air in it. Turn the pump power back on, and see what the pressure builds to when the shutoff occurs. Then open the outlet lne valve. The pressure will drop and ultimately the low pressure limit will happen and the pump will start.

As long as the triggering pressures are correct, and there is air in the tank, all should be good.
Modern tanks have a diaphragm that separates the water from the air. There may be an air fitting on these.
Old tanks don't, so the air can eventually be absorbed into the water, and you have to add more air. Some of these tanks had air fittings on the top.

Jun 19, 2015 | Plumbing

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We have a well and our water pressure keeps changing, from very low, to blasting... irregular, no pattern

You could have two problems. The first and most likely is that the pressure tank does not have a high enough pre-charge or the diaphragm has a leak. The pressure tank acts like a shock absorber for the well pump and pressure switch. When the water pressure drops the switch turns the well pump on. The pump runs until the pressure switch stops the pump. As the water pressure builds it pushes up on the diaphragm inside the pressure tank. If the pre-charge pressure is too low the system cycles less but the pressure fluctuates more. To fix this, the tank will have a valve on top that looks like a tire air valve. The tank pre-charge should be 30-35 psi. If your pressure switch is working properly, when the pump builds up the pressure about 15-20 psi more, the switch shuts the pump off. The pre-charge above the diaphragm pushes down and forces the water out to the tap.
If the pressure switch is set incorrectly the fluctuation may produce similar results. The pressure switch should be set to deliver adequate pressure and according to the well pumps working limits. Depending on the how far up the water has to be elevated to reach the highest shower head the more pressure is needed. The pressure switch has electrical contacts that could be burned and not releasing to stop the pump correctly. This should be checked by qualified service technician. Electricity and water don't play well together, add in a little carless good intent and you could have worse problems.
Get out the pressure gage and check the pre-charge, add air with a bike pump or a regulated compressor. If water spurts out of the air valve, the diaphragm has a leak. If the pressure is not the problem, call for service. This video has all the info you may need.
Components Of Typical Well Water System

May 22, 2014 | Plumbing

2 Answers

I have a carrier roof top unit that goes off on short cycles. how should i trouble shoot

It could be Low on Freon and going OFF on low pressure switch.......
Or it could be a dirty condensor coil or a Condensor Fan Motor not running and going OFF on High pressure switch....

Or if you are running the RTU in Low Ambient Conditions like 50* to 60* degrees Outside the Condensor Fan Motors could be cycling on a Fan Cycling Control....which is normal operation

So it could be any one of these or something different I would need to know what you are talking
about what is cycling??? Fan, Compressor , blower motor, whole unit shuting down, etc.

May 14, 2011 | Heating & Cooling

1 Answer

Water will not stop and the washing cycle will not start.

You have one of the following;
Too low drain hose,9Must be 30" high),
Drain hose is too tight in drain(no air gap),
Defective water valve(leaking water through),
Pinched or clogged air pressure tube to water level switch,
Defective pressure switch.

May 08, 2011 | Maytag Washing Machines

1 Answer

Gould 1/2hp submergible well pump cycles on and off constantly. low to no water pressure .The pressure switch remains in the closed position. Power to pump side of pressure switch good. pump runs 15...

My first thought was that of a water logged tank which causes short cycling, from your notes the tank is good (the tank may be partially water logged though) If the tank is ok and your getting short cycling (and the switch is good) I would guess your check valve down the well has failed. As the pump creates pressure then shuts off the water may be going right back down the well causing the pump to cycle again. This could also account for the poor water pressure as the check valve may be stuck slightly open allowing the system to loose pressure but only allowing a small amount of flow by when running. There could be a leak within the pumps drop-pipe and your loosing pressure through this leak. I expect you'll have to have the pump pulled.
I hope this may have helped,

Oct 10, 2009 | Plumbing

1 Answer

Compressor short cycles during operation. (load / unload). hose to guage and pressure switch ok. what could be the problem?

The pressure switch has an adjustment for the low pressure cut in and the high pressure cut out. If the pressure range is set too close the cycles will be short. You need to work out which setting is wrong by looking at the pressure guage when it is cycling and adjust the pressure switch accordingly.

Sep 06, 2009 | Ingersoll Rand UP6-30-125 120 Gallon...

1 Answer

Compressor will not turn off but cannot find the location of the low pressure switch to change it. blows cold but will not cycle off...

there is a thermistor switch located in evaporator case(thin black single or 2 wires) that makes the compressor cut in and out (cycle) it monitors evaporator temperature.
check head pressures with air cond charging station or gauge set and monitor pressure on high and low side (150-200kpa on low, 1500-1800kpa on high good average depending on ambient temp) if it is low on gas due to leak this can also keep compressor running longer due to evaporator temp not reaching lowest threshhold to cut compressor out

Jun 13, 2009 | 1998 Chevrolet S-10 Pickup

2 Answers

A/C compressor clutch won't engage, system won't cool

Sounds to me like its simply ran out of gas!, get the system inspected, the clutch wont engage if there is no pressure in the system, hence the switch problem.
Get it recharged and check for leaks, vehicle with air con will loose around 50grams per year from normal usage, if its been years since it was check it could simply just need recharging.

May 21, 2009 | 2002 Ford F250 Super Duty SuperCab

1 Answer

When washer is in super wash cycle water will not stop causingthe tub to over fill running onto the floor.

It sounds like you are trying to use the largest water level setting. If this is correct you may have a pressure switch problem.

First turn the timer to spin and get all of the water out, that start a washer cycle with the water level set to the small or low setting and see if the washer fills to this level. if it stops at the low level great Now if it continues to fill and does stop you may need a pressure switch or the hose needs to be replaced that runs from the tub to the pressure switch.

Now set at the medium level and try again. does it stop or over fill?

If it over fills you probably need a pressure switch however before you purchase this, make sure the hose is in good condition one pin hole will cause your overfill condition.

Jul 09, 2008 | Washing Machines

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