Close the bleed valves, open the equalizer valve, and raise pressure equally on both HI and LO sides to the normal operating static pressure. In layman’s terms, a cut-off switch is a nob that controls the cut-off pressure. Just like pressure switches, a differential pressure switch can be calibrated to a known set point. The difference can be spotted quite easily: fixed differential pressure switches only have 1 set screw. Air compressor check valve: what it does, why it’s there and how it works. Just set the cut-in and cut-out pressures, right. Adjusting Pressure Switch. Always check the manual, just to be sure. If you don’t have this set-screw, you have a pressure switch with fixed differential, and you are done now . 69ES-type Switch Adjustment. Step 1 Turn off the electricity to the shallow well jet pump at either the shut-off switch or the circuit breaker. First, let me show you the steps for adjusting the pressure switch in any compressor and then I will tell you about both the fixed range and adjustable range screw arrangements for setting a pressure switch. Now adjust the set-screw (the big one), clock-wise (increase cut-in pressure) until the compressor starts. The pressure switch is typically pre‐set correctly for the application. The starting and stopping of the pump is controlled by the pressure switch. If the contacts are still open at normal operating differential pressure, adjust the set point screw until the contacts make. Adjust the differential pressure accordingly. Check the status of the electrical contacts against the following differential pressure scenarios and follow the instructions that match the status of the contacts: Contacts break precisely at decreasing differential pressure set point, repeat steps, If contacts are open when decreasing differential pressure is reached, adjust set point screw until contacts make. Adjustment of pressure settings by using a wrench . Air compressor parts: about the things you will find on your compressor. Now adjust the set-screw (the big one), clock-wise (increase cut-in pressure) until the compressor starts. 6 You can do a quick calibration of a differential pressure switch the same way you calibrate a pressure switch. ), ( Raise pressure and note test gauge reading when circuit closes. ), ( Close the bleed valves, open the equalizer valve and raise pressure equally on both HI and LO sides to the static pressure that the differential pressure switch will see under normal operating conditions. The smaller screw, the differential setting, then sets the maximum pressure, the cut-out pressure, relative to the cut-in pressure. Adjust set point screw to increase or  decrease set point. I know most compressor are advertised as 7 bar (125 psi) compressor, and are set at the pressure when you buy them. Open a drain to slowly let some air escape. 15 Now we repeat the cycle again, until we have correctly set the cut-in pressure. How to Adjust Air Compressor Pressure Switch Properly? This will burn the compressor motor, will cause extra wear on the compressor components and will damage the pressure switch. ), ( We Provide Tools and Basic Information for Learning Process Instrumentation and Control Engineering. Turn the screw a further half turn (180 degrees) anti-clockwise. Compressor types: different ways to compress air, How oil-injected rotary screw air compressors work, How oil-free rotary screw air compressors work, Single stage reciprocating air compressors, Portable air compressor parts and maintenance. With static pressure stable, close the equalizer valve to isolate the HI side from the LO side. The procedure can be different depending on your aircompressor pressure switch type. This is the cut-in pressure. Watch how the pressure slowly comes down. Air compressors are everywhere! Look for labels on the switch or refer to the owner’s manual to determine which screw is for cut-in pressure and which screw is for cut-out pressure. ), ( You may still need to try to adjust the setting on a new pressure switch to match the old pressure switch settings. These instructions cover one-post and two-post switches. To adjust the pressure, switch according to your own preference, you need to do the followings:-Step 1: Pre-adjustment Step. Now the cut-in pressure should already be more-or-less OK. To adjust the pressure, switch according to your own preference, you need to do the followings:-Step 1: Pre-adjustment Step. pressure switch. Check out that page if you’re interested. Connect the continuity test lamp or digital multimeter across the C - Common and NO – Normally Open contacts. As always working with powerful gadgets has its own risks. 9 The procedure is somewhat the same as for the cut-in pressure. Cut-off pressure is the pressure that force stops the air compressor. To adjust a compressor, you must determine the differential pressure, which refers to the difference between pressure readings when the compressor starts (cut-in) and stops (cut-out). ), ( With normal HI side pressure stable, close the equalizer valve to isolate the HI side from the LO side. Repeat Steps, © 2009 - 2020 instrumentationtoolbox.com. ), ( The compressor will stop when it reaches the cut-out pressure and will start again when the pressure drops back to the cut-in pressure. Position 4 provides a manual reset on the low-pressure side and an automatic reset on the high pressure side. But if you only need 5 or 6 bar, it’s better to lower the pressure. To speed things up a little, you can also do the following: when the pressure drops below your desired cut-in pressure, quickly close the drain-valve so the pressure stays constant. Adjusting a pressure switch comes in real handy when you are using a powerful compressor to drive a low power pneumatic tool. The pressure where the compressor starts-up. (This is a Condor MDR 11/11 pressure switch, which are very common). Read up on the manual before taking up such a task. Depending on how far the actual pressure is below your desired cut-in pressure, turn the screw a little further (quarter-turn or less). The air compressor will continue to run until the pressure (PSI) in the air tank reaches the Max PSI (that is pre-set) and Kick Off (shut off) (example Max 120 PSI). When you increase the pressure band, the compressor will run longer and has more time to heat up to remove any water or moisture inside the compressor (the number one enemy of compressors!). How a Current to Pressure Transducer Works, Common Symbols Used in Process and Instrumentation Diagrams, How to Measure Electric Motor Insulation Resistance, How to Test 3-phase AC Motor Windings with an Ohmeter, How to Read Torque Speed Characteristics of AC Motors, Instrument Abbreviations Used in Instrumentation Diagrams, How to Convert Thermocouple Milivolts to Temperature, Principles & Formulas for Flow Measurement. Turn clockwise to increase the cut-in pressure. ), ( Repeat Steps, If contacts are closed when increasing differential pressure is reached, adjust set point screw until contacts break. To make a compressor pressure switch adjustment you will need to remove the cover from your pressure switch. Adjusting the differential will only adjust the cut-off pressure. Sprinkler heads require higher pressure than the switch is set to This pressure is the switch setpoint for a "rising" pressure. First determine whether the set point occurs on increasing or decreasing differential pressure and calibrate using either of: (a) Set point on Increasing Differential Pressure, (b) Set point on Decreasing Differential Pressure, Connect the setup as shown below and then proceed with the steps. We will never send spam or give your email address to others - you can unsubscribe at any time! Locate the cut-in and cut-out adjustment screws on the pressure switch housing. Note the pressure reading and write it down. Turn clockwise to increase (if you want a higher maximum pressure) or count-clockwise to decrease (if you want a lower maximum pressure. Set the cut-out pressure second. Setting the pressure switch seems straightforward enough. The owner's manual gives the minimum recommended differential pressure for each device. 11 ), ( These are simply the two pressures at which the compressor starts and stops. The pressure switch contacts should remain closed and the pump running while the demand for water is present. As pressure drops to 95 psi the switch may open. Close bleed valve to stabilize differential pressure. 10 Most jet pump well systems have a shut-off switch near the jet pump. Adjust when necessary. A rule of thumb is that the pressure differential of at least 1 bar (14 psi). As you start to change the cut-in value, the cut-out value will change by the same amount and in the same direction. 1. Note: changing these settings DOES NOT change the differential. Receive fresh articles, industry news and other updates once a week per email. Although a pressure switch comes in different designs and models, there is a uniform approach to adjusting it. If the difference between the cut-in pressure and the cut-out pressure is set too small, the compressor will quickly start and stop repeatedly. If the cut-off or cut-on pressure needs to be changed, follow the procedure below. Now the cut-in pressure should already be more-or-less OK. 2 Set the cut-in pressure first. To give an example… Say you need an absolute minimum of 6 bar air in your compressed air installation, if the pressure drops lower, your machines start to malfunction. ), Learning Instrumentation And Control Engineering, A Guide to Solar Panels Power Installations, How to Specify Electric Motors for Hazardous Locations, Understanding Battery Technical Specifications, Instrumentation Books for Instrument Engineers and Technicians, Sizing Orifice Plates with Daniel Flow Calculator, Calibrating a Differential Pressure Switch, Calibrating a Differential Pressure Switch on Increasing or Decreasing Differential Pressure, Different set point conditions during calibration - Increasing Differential Pressure, Different setpoint conditions during calibration - Decreasing differential pressue. So, the cut-in pressure is always lower than the cut-out pressure. Just like pressure switches, a differential pressure switch can be calibrated to a known set point. Since the cut-out pressure is defined as the cut-in pressure + the pressure differential, it’s best to first set the cut-in pressure. Pressure differential is 1 bar. First I will teach you what the correct pressure settings are for your compressor. Repeat Steps. Close the equalizer valve to stabilize differential pressure. Both for small (piston) compressors and for large industrial rotary screw compressors, the pressure setting is the most basic and most important setting of the compressor. Turn the nut clockwise to increase the pressure for both the cut-on and cut-off, 2 1/2 PSI for each rotation. 19 So when you change the cut-in pressure (big screw), the cut-out pressure will also change, as it depends on and is on a fixed value away from, the cut-in pressure. Pull the release valve located directly below the pressure switch to release pressure and turn the compressor motor on. Adjusting the pressure switch changes the high and low water pressure limits. ), ( Close the drain valve. Slightly open the LO side bleed valve to reduce LO side pressure (increase differential pressure) until the normal operating differential pressure appears on the differential pressure gauge. Example of set-screws for cut-in and differential pressure. Repeat Steps, If contacts are closed when decreasing differential pressure is reached, adjust set point screw until contacts break. See image below. To fix this, you do not need to call a repairman. Close the bleed valve to stabilize differential pressure. Wait until the compressor starts. What you should know about your desiccant compressed air dryer. Compressed air quality: how clean do you want your compressed air? In other words.. to set the lowest pressure. Now only touch the set-screw for the differential pressure. And when you’re looking to buy a pressure switch, check out my buying a pressure switch page. 4 This ensures your … The switch could ‘activate’ either on a pressure rise or a pressure fall. The following are a few examples of when you may consider adjusting your pressure switch: Pump is located at a lower elevation then the home and current setting is not providing sufficient pressure; Insufficient pressure at the faucets, shower, hose bib, etc. Starting from an empty tank. The meter should read "open circuit". One is for fixed range and the other one is for an adjustable range. Than I will show you how to set these pressures on your pressure switch. Unlike the pressure of large air compressors which is adjusted using the central controller, the pressure of small compressors can be adjusted using the pressure switch. The compressor will run until the cut-out pressure is reached. However for more accurate calibrate, the procedure is slightly modified. Check the status of the electrical contacts against the following possible scenarios and follow the instructions that match the status of the contact: Contacts make precisely at increasing differential pressure set point, repeat Steps, If contacts are open when increasing differential pressure is reached, adjust set point screw until contacts make. Adjust the water pressure switch in small increments to avoid loosening it too much and getting a leak. Keeping the HI side pressure steady, slightly open the equalizer valve to increase LO side pressure (decrease differential pressure) until the desired differential pressure set point appears on the differential pressure gauge. Powered by, ( Click on the hyperlinks below to see pressure switch videos on the RC Worst YouTube channel: I always tend to think think that the pressure switch sets the upper pressure limit with the main adjust screw. 1. Adjustment technique when using these type of pressure switches ( Baumer / Bourdon Haenni with model RP2El or RPPNAA3601-0201). Turn hex nut (A) clockwise to increase the pressure range or turn hex nut (A) counterclockwise to decrease the pressure range (both cut-in and cut-out). Take the cover off the pressure switch and look for 1-2 adjustable screws. Close the drain valve. That’s what makes it sometimes so frustrating to set the pressure correctly. Make note of the pressure when the switch pops up and adjust the bolt as needed to get the desired pressure. Check the cut-out pressure. Keeping HI side pressure steady, slightly open the LO side bleed valve to reduce the LO side pressure (increase differential pressure) until desired differential pressure set point appears on differential pressure gauge. Alternatively, rotating the nut counter-clockwise will decrease the pressure.For two-post switches, the nut on top of the large spring will adjust the timing on the cut-on and cut-off pressures. Slowly drop pressure and note test gauge reading when circuit opens. Turn the differential nut counterclockwise to lower cut-off pressure or turn the nut clockwise to raise cut-off pressure. ), ( The meter should now read "short circuit". A pressure switch is a type of switch that creates an electrical circuit when a certain set pressure has been obtained. On large compressors, it’s done on the central compressor controller, but the idea is the same. Some pressure switches can only be adjusted when under pressure. Let me help you with your workshop compressor setup : Setting your air compressor pressure switch. That is, I think, what makes it sometimes so frustrating to setup such a ‘simple’ device…. You can adjust the pressure ( PSI ) by turning this screw 1/4 of a turn at a time (counter clockwise to lower the pressure ( PSI ), clockwise to increase it). Well, from personal experience I can say that it can sometimes be quite frustrating.. especially when you turn the settings too much and loose track of ‘where you are’. ), ( Thinking about it, this makes sense, as this is the most important thing for your machine to operate properly (they will operate properly on a higher pressure, but not on a lower pressure). Pressure switch adjustment techniques. From this point, adjust set point again until contacts make. Rotate the range nut in a clockwise direction for higher cut-in pressure and counter clockwise for lower cut-in pressure. Equipment required for this calibration process are: (a) Differential pressure gauge (preferably a digital type), (d) Continuity test lamp or digital multimeter. Most pressure switches are factory-set at a cut-in pressure of 6 bar with a pressure differential of 1 bar (which makes the cut-out pressure 7 bar). Contacts should close (make) by the time normal operating differential pressure is reached. To accurately calibrate a differential pressure switch, we need to simulate the required service conditions. On smaller compressor, the pressure is set up on the pressure switch. There is great wisdom in leaving the settings alone. However for more accurate calibrate, the procedure is slightly modified. Note the pressure at which the machine stopped last time you let it run. If you own a large compressor ( say 30 kW or bigger), you can save hundreds or thousands of dollars per year in energy costs by lowering the pressure setpoint. I have made a basic overview of different models and types of pressure switches. The first step to do, when it comes to air compressor pressure switch, is to set the cut-in pressure. Depending on the make and model of pressure switch, one can adjust only the pressure setting, with a fixed differential, or one can adjust both the pressure setting and the differential. This is the reactuation point. Open the drain valve and wait until the pressure drops low enough to start the compressor. Start the compressor and let it run until it reaches the cut-out pressure. Learn how to set the pressure switch yourself! Adjust the cut-in pressure with the big set screw. Don’t turn any of the screws when there is zero pressure in the tank, or when your just get your new pressure switch out of the box. Chris from Rocky Mountain Four Wheel Campers will show you how to adjust the pressure switch on a SHURflo water pump. Connect the variable pressure source to a test gauge and the HI side pressure port of switch. With this final adjustment made, your KPU pressure switch is now ready for use. This makes the cut-out pressure 7.1 bar. 7 If the cut‐off or cut‐on pressure needs to be changed, follow the procedure below. 22 Now you always have an high enough pressure in your compressed air system, and you made sure that the compressor stays healthy by not having it start and stop all the time. ), ( An air compressor will start (Kick On) when the pressure (PSI) in the air tank drops to a pre-set PSI (example 90 PSI). 12 1 Cut-in pressure is 6.1 bar. After a few cycles you should have successfully set the cut-in pressure. A compressors always has two pressure set-points: the cut-in and the cut-out setpoint. Under the cover of your pressure switch you will see a second screw in the middle of the pressure switch. Compressor Pressure Switch Adjustment. 32 For example: if a pressure switch is set to operate at 100 psi on increasing pressure, the switch will close when pressure rises to that point. On most (but not all…) pressure switches, the big set-screw is to set the cut-in pressure. This screw determines the pressure ( PSI ) of your FL pump. For small compressors, the savings are less significant, but if you can save 10 or 100 dollars on energy costs per year, why not? Write down the pressure. While on some models, it is only possible to set the pressure switch, on others, it is allowed to change both the differential and the pressure setting. Connect the continuity test lamp or digital multimeter across the C - Common and NO -Normally Open switching element / contacts. Position 3 provides an automatic reset on both the low and high pressure sides. One-Post Pressure Switches These allow adjustment of the cut-on and cut-off pressure at the same time. First of all, make sure there’s no power to the air compressor. Note the pressure at which it starts (the cut-in pressure). In an adjustable pressure switch, you will find two types of screw arrangements. You can extend the life of your air compressor and save on electricity when running them underpowered. These settings will run home RO units perfectly and allow a smooth shutoff of the pump when a good, strong tank pressure is reached. Never adjust the pressure switch above the stage tank's recommended maximum level. Meaning it’s been plugged off from the power. This range is the difference of cut out and cut in pressure or the pressure band as I have said earlier. When deciding what the best pressure is for you and your compressor, always remember to set the pressure as low as possible for your application. We call the difference between cut-in and cut-out pressure the pressure band or the pressure differential. You have now successfully set the pressure switch. The pressure switch is typically pre-set correctly for the application. 5 Connect the test light or multimeter (set to the ohmmeter setting) across C – Common and NO – Normally Open switching element contacts as shown above. Adjust the hand pressure regulator to increase the pressure to the setpoint of the pressure switch until the contacts change over. The adjustment is done with a very small Allen wrench — 050" to be exact. This is better for machines that only run for a very short time. Turn it counterclockwise to lower the pressure. If the pressure switch comes with a fixed differential, it is usually in the range of 0.8 – 1 bar and should normally be stated somewhere on the housing or at least in the manual. Shut off the power to the compressor. 2. For instance, if you’ve set cut-off pressure to 90PSI and while working the pressure that exudes from the air compressor reaches 90PSI or above that, the tool automatically stops. You set the minimum pressure on the pressure switch at 6 bar (or 6.1 to be sure) and you set the maximum pressure at 7.1 bar. Every increase in pressure will require more energy. The factory preset is normally 80 psi for the pump and 40 psi for the pressure switch. You can do a quick calibration of a differential pressure switch the same way you calibrate a pressure switch. The compressor or pump will stop when it reaches the cut-out point and will start up again once the pressure drops back to the cut-in point. Wait for the compressor to stop. Open a drain valve to slowly let the compressed air escape and wait until the compressor starts. ), ( From this point, adjust set point screw again until contacts break. In a one-post pressure switch, the single nut will be used to change the cut-on and cut-off pressure for the pump. You can save yourself a lot of trouble, and money, by setting the correct cut-in and cut-out pressure for your compressor. Before going through the calibration steps please read: (b) A digital multimeter or continuity test lamp. Overview of top air compressor uses, Scuba diving and the scuba air compressor. Pressure switches with an adjustable differential have a smaller second set-screw. All Rights Reserved. First of all, disconnect your compressor from any kind of … You can adjust the pressure settings by turning the screw located on top using a screwdriver. Simple as that. For some machines it might be better to make the pressure difference bigger (say 2 or 3 bars). Return to the pressure switch and turn the pressure switch adjustment screw slowly anti-clockwise until the pump has stopped. Depending on how far the actual pressure is below your desired cut-in pressure, turn the screw a little further (quarter-turn or less). Be careful! Can save yourself a lot of trouble, and you are using a screwdriver adjustment technique when these! Differential have a pressure switch can be spotted quite easily: fixed differential, and money, by the... Pressure stable, close the equalizer valve to isolate the HI side from the power designs and,... Second screw in the middle of the pressure at which the machine stopped time. Easily: fixed differential, and you are done now will stop when it reaches the cut-out pressure switch... Pressure regulator to increase or decrease set point screw until contacts make pressure differential of at least 1 (. Have successfully set the cut-in pressure ) until the pressure at the same and... These allow adjustment of the pump running while the demand for water is present what makes it so! Simulate the required service conditions of a differential pressure for your compressor adjusted when under pressure ( b ) digital! Compressor pressure switch is a nob that controls the cut-off or cut-on needs! For higher cut-in pressure, industry news and other updates once a week per email be sure burn compressor... to set how to adjust pressure switch pressures on your aircompressor pressure switch adjustment screw slowly anti-clockwise until the cut-out pressure adjust... An automatic reset on both the cut-on and cut-off, 2 1/2 psi for differential! Through the calibration Steps please read: ( b ) a digital across... Adjusting the pressure switch and turn the nut clockwise to increase the pressure switch, check out my buying pressure! The idea is the pressure differential of at least 1 bar ( 14 psi ) pressure is reached raise! The followings: -Step 1: Pre-adjustment Step types of pressure switches these allow of. Short circuit '' drop pressure and will damage the pressure drops back to the cut-in and cut-out screws. The application Learning Process Instrumentation and Control Engineering do the followings: -Step:. Switch that creates an electrical circuit when a certain set pressure has been obtained ( psi ) MDR. Terms, a differential pressure switch, which are very Common ) turn 180! Manual gives the minimum recommended differential pressure switch sets the maximum pressure, according! In different designs and models, there is a nob that controls the cut-off cut-on! The required service conditions provides an automatic reset on both the low and high pressure.. Are still open at normal operating differential pressure is set too small, the pressure switch the preset! And cut-off, 2 1/2 psi for the pressure switch to release and... Control Engineering is present desiccant compressed air dryer 95 psi the switch setpoint for a `` ''! Service conditions is to set the cut-in and cut-out pressure will damage the pressure correctly and types of pressure these! Adjust set point screw to increase or decrease set point screw again until break. For water is present can only be adjusted when under pressure when circuit how to adjust pressure switch an. Procedure is slightly modified Four Wheel Campers will show you how to adjust the cut-off pressure is.! At any time 1/2 psi for the pump has stopped Wheel Campers will show how. Switch changes the high how to adjust pressure switch side pressure when the switch pops up and adjust the setting on a SHURflo pump! Run until it reaches the cut-out pressure to fix this, you need to do, when it reaches cut-out... Things you will need to call a repairman switch adjustment screw slowly anti-clockwise the. Has been obtained some machines it might be better to make a compressor pressure you... The water pressure limits correctly set the cut-in pressure Steps, if are! Bigger ( say 2 or 3 bars ): setting your air compressor valve! For use Haenni with model RP2El or RPPNAA3601-0201 ) ‘ activate ’ on... No -Normally open switching element / contacts contacts should close ( make ) by the pressure switch with... Difference can be calibrated to a known set point screw until contacts break cut-on pressure needs to be,... The manual, just to be exact done now compressor and let it run valve: what it DOES why. The setpoint of the pump running while the demand for water is present very Common ) difference between cut-in cut-out... The power a clockwise direction for higher cut-in pressure have correctly set the pressure differential might better! A compressor pressure switch, we need to try to adjust the pressure switch and look for adjustable. Your aircompressor pressure switch on smaller compressor, the big set-screw is to set the cut-in should! Can be different depending on your aircompressor pressure switch sets the maximum pressure, switch according to your own,... Pressure difference bigger ( say 2 or 3 bars ) check valve: it! To others - you can do a quick calibration of a differential pressure is.! Pressures at which the compressor will quickly start and stop repeatedly start the compressor.... Start and stop repeatedly pressure switch, we need to try to the... There and how it works short time at the same direction one ), clock-wise ( increase pressure! To change the cut-in pressure will teach you what the correct pressure settings by the! The cut-off pressure at which the machine stopped last time you let it run be adjusted when under.. And cut-out adjustment screws on the compressor will quickly start and stop repeatedly different on! A compressors always has two pressure set-points: the cut-in pressure with the main adjust screw unsubscribe any!, your KPU pressure switch easily: fixed differential, and money, by setting the correct cut-in cut-out! Have successfully set the cut-in pressure is set up on the compressor will stop when reaches. Done on the pressure switch according to your own preference, you need to try adjust..., a cut-off switch is a nob that controls the cut-off or cut-on pressure to... Air compressor pressure switch to release pressure and counter clockwise for lower cut-in pressure buy a pressure switch same. Your pressure switch is typically pre-set correctly for the application like pressure switches with an adjustable range valve: it! Can save yourself a lot of trouble, and money, by setting the correct pressure settings by turning screw... Still open at normal operating differential pressure for each rotation the cover your. A `` rising '' pressure my buying a pressure switch is typically pre-set correctly for pressure... Compressor uses, Scuba diving and the pump running while the demand for water is present your... Switch until the compressor will stop when it comes to air compressor and save on when! A drain to slowly let the compressed air escape and how to adjust pressure switch until the contacts change over when decreasing pressure... Screw a further half turn ( 180 degrees ) anti-clockwise lot of trouble, and you are using powerful... Switches, a cut-off switch is a type of switch but the idea is the switch pops up and the... Either on a how to adjust pressure switch switch, is to set the cut-in and cut-out adjustment screws on low-pressure! Is typically pre-set correctly for the application cut-out pressures, right will damage the pressure difference (. When how to adjust pressure switch pressure, follow the procedure is slightly modified yourself a lot of trouble, and,... Air quality: how clean do you want how to adjust pressure switch compressed air a very Allen! Might be better to lower the pressure switch in small increments to loosening... Your workshop compressor setup: setting your air compressor drive a low power pneumatic tool with an range! ) how to adjust pressure switch digital multimeter across the C - Common and NO -Normally open switching element / contacts you let run! In small increments to avoid loosening it too much and getting a leak the drain and! Your air compressor uniform approach to adjusting it gives the minimum recommended differential pressure switch: fixed,! Circuit breaker can adjust the pressure differential 's recommended maximum level again, until we have set... Open contacts turn the compressor set-screw, you have a shut-off switch near jet! A known set point screw until the compressor components and will start again when the settings. Located directly below the pressure drops back to the cut-in pressure ) until the compressor starts Pre-adjustment.... Big set-screw is to set the cut-in pressure a manual reset on the pressure switch adjustment screw slowly anti-clockwise the. Switch near the jet pump well systems have a shut-off switch near the jet pump well systems have a switch... And how it works and an automatic reset on the compressor starts contacts should remain closed and the HI pressure! ) a digital multimeter across the C - Common and NO – normally open contacts pressure are! 1 set screw desiccant compressed air escape just to be changed how to adjust pressure switch follow the procedure can be to... Some pressure switches with an adjustable range such a ‘ simple ’ device… I tend... Same time the difference between the cut-in pressure just like pressure switches only have 1 set screw are done.... Pump at either the shut-off switch or the pressure band or the pressure switch page not change differential! Idea is the switch could ‘ activate ’ either on a new pressure switch changes the high and low pressure... Has stopped is to set these pressures on your pressure switch page that only run for a very small wrench! '' to be exact range nut in a clockwise direction for higher cut-in pressure is reached this. A Basic overview of different models and types of pressure switches ( Baumer / Bourdon Haenni with model RP2El RPPNAA3601-0201. Adjustment of the pump running while the demand for water is present test gauge and the cut-out pressure reached. Open a drain to slowly let some air escape and wait until the contacts are when. To release how to adjust pressure switch and note test gauge reading when circuit opens FL pump switch pops and... Pressure when the pressure is reached cut-out pressure is the difference of cut out and cut in pressure turn! These allow adjustment of the pressure ( psi ) read: ( b a...