Sprinkler heads require higher pressure than the switch is set to 2 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. Connect the test light or multimeter (set to the ohmmeter setting) across C – Common and NO – Normally Open switching element contacts as shown above. For some machines it might be better to make the pressure difference bigger (say 2 or 3 bars). You can do a quick calibration of a differential pressure switch the same way you calibrate a pressure switch. To adjust the pressure, switch according to your own preference, you need to do the followings:-Step 1: Pre-adjustment Step. 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. Turn it counterclockwise to lower the pressure. One is for fixed range and the other one is for an adjustable range. Make note of the pressure when the switch pops up and adjust the bolt as needed to get the desired pressure. 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. The meter should read "open circuit". From this point, adjust set point again until contacts make. Repeat Steps, If contacts are closed when increasing differential pressure is reached, adjust set point screw until contacts break. A pressure switch is a type of switch that creates an electrical circuit when a certain set pressure has been obtained. As pressure drops to 95 psi the switch may open. If the cut-off or cut-on pressure needs to be changed, follow the procedure below. 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. The pressure switch is typically pre-set correctly for the application. That’s what makes it sometimes so frustrating to set the pressure correctly. 10 With static pressure stable, close the equalizer valve to isolate the HI side from the LO side. Note the pressure at which the machine stopped last time you let it run. The switch could ‘activate’ either on a pressure rise or a pressure fall. To adjust the pressure, switch according to your own preference, you need to do the followings:-Step 1: Pre-adjustment Step. Depending on how far the actual pressure is below your desired cut-in pressure, turn the screw a little further (quarter-turn or less). These are simply the two pressures at which the compressor starts and stops. There is great wisdom in leaving the settings alone. This is the cut-in pressure. ), ( From this point, adjust set point screw again until contacts break. ), ( Powered by, ( ), ( Pressure switch adjustment techniques. Depending on how far the actual pressure is below your desired cut-in pressure, turn the screw a little further (quarter-turn or less). Just like pressure switches, a differential pressure switch can be calibrated to a known set point. 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. Air compressor check valve: what it does, why it’s there and how it works. Now the cut-in pressure should already be more-or-less OK. A compressors always has two pressure set-points: the cut-in and the cut-out setpoint. Turn clockwise to increase the cut-in pressure. Set the cut-in pressure first. 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. One-Post Pressure Switches These allow adjustment of the cut-on and cut-off pressure at the same time. Always check the manual, just to be sure. Position 4 provides a manual reset on the low-pressure side and an automatic reset on the high pressure side. Adjustment technique when using these type of pressure switches ( Baumer / Bourdon Haenni with model RP2El or RPPNAA3601-0201). As you start to change the cut-in value, the cut-out value will change by the same amount and in the same direction. ), ( On smaller compressor, the pressure is set up on the pressure switch. Check the cut-out pressure. After a few cycles you should have successfully set the cut-in pressure. 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. Now only touch the set-screw for the differential pressure. To accurately calibrate a differential pressure switch, we need to simulate the required service conditions. Position 3 provides an automatic reset on both the low and high pressure sides. 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. Locate the cut-in and cut-out adjustment screws on the pressure switch housing. Let me help you with your workshop compressor setup : Setting your air compressor pressure switch. The owner's manual gives the minimum recommended differential pressure for each device. Cut-off pressure is the pressure that force stops the air compressor. 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. With normal HI side pressure stable, close the equalizer valve to isolate the HI side from the LO side. Be careful! Compressor Pressure Switch Adjustment. Slowly drop pressure and note test gauge reading when circuit opens. Most jet pump well systems have a shut-off switch near the jet pump. This will burn the compressor motor, will cause extra wear on the compressor components and will damage the pressure switch. Example of set-screws for cut-in and differential pressure. These settings will run home RO units perfectly and allow a smooth shutoff of the pump when a good, strong tank pressure is reached. 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. 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. See image below. Close the bleed valve to stabilize differential pressure. Click on the hyperlinks below to see pressure switch videos on the RC Worst YouTube channel: Compressed air quality: how clean do you want your compressed air? You may still need to try to adjust the setting on a new pressure switch to match the old pressure switch settings. Now the cut-in pressure should already be more-or-less OK. Every increase in pressure will require more energy. Under the cover of your pressure switch you will see a second screw in the middle of the pressure switch. Pull the release valve located directly below the pressure switch to release pressure and turn the compressor motor on. So, the cut-in pressure is always lower than the cut-out pressure. The factory preset is normally 80 psi for the pump and 40 psi for the pressure switch. The first step to do, when it comes to air compressor pressure switch, is to set the cut-in pressure. 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. 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. Starting from an empty tank. As always working with powerful gadgets has its own risks. Some pressure switches can only be adjusted when under pressure. If the contacts are still open at normal operating differential pressure, adjust the set point screw until the contacts make. Rotate the range nut in a clockwise direction for higher cut-in pressure and counter clockwise for lower cut-in pressure. 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. ), 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. 32 Return to the pressure switch and turn the pressure switch adjustment screw slowly anti-clockwise until the pump has stopped. However for more accurate calibrate, the procedure is slightly modified. First of all, make sure there’s no power to the air compressor. 5 But if you only need 5 or 6 bar, it’s better to lower the pressure. Pressure differential is 1 bar. If you don’t have this set-screw, you have a pressure switch with fixed differential, and you are done now . You can adjust the pressure settings by turning the screw located on top using a screwdriver. Wait until the compressor starts. 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. Note: changing these settings DOES NOT change the differential. Set the cut-out pressure second. Wait for the compressor to stop. This pressure is the switch setpoint for a "rising" pressure. 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. And when you’re looking to buy a pressure switch, check out my buying a pressure switch page. 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). Write down the pressure. Just set the cut-in and cut-out pressures, right. Connect the variable pressure source to a test gauge and the HI side pressure port of switch. Never adjust the pressure switch above the stage tank's recommended maximum level. This ensures your … Note the pressure at which it starts (the cut-in pressure). Simple as that. ), ( Adjust set point screw to increase or  decrease set point. The starting and stopping of the pump is controlled by the pressure switch. You have now successfully set the pressure switch. First I will teach you what the correct pressure settings are for your compressor. ), ( Adjust the water pressure switch in small increments to avoid loosening it too much and getting a leak. The compressor will run until the cut-out pressure is reached. The pressure switch is typically pre‐set correctly for the application. 19 Turn the screw a further half turn (180 degrees) anti-clockwise. Turn the nut clockwise to increase the pressure for both the cut-on and cut-off, 2 1/2 PSI for each rotation. That is, I think, what makes it sometimes so frustrating to setup such a ‘simple’ device…. We call the difference between cut-in and cut-out pressure the pressure band or the pressure differential. You can do a quick calibration of a differential pressure switch the same way you calibrate a pressure switch. Pressure switches with an adjustable differential have a smaller second set-screw. These instructions cover one-post and two-post switches. We Provide Tools and Basic Information for Learning Process Instrumentation and Control Engineering. 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). Although a pressure switch comes in different designs and models, there is a uniform approach to adjusting it. Turn the differential nut counterclockwise to lower cut-off pressure or turn the nut clockwise to raise cut-off pressure. Repeat Steps, © 2009 - 2020 instrumentationtoolbox.com. 4 To make a compressor pressure switch adjustment you will need to remove the cover from your pressure switch. Chris from Rocky Mountain Four Wheel Campers will show you how to adjust the pressure switch on a SHURflo water pump. Cut-in pressure is 6.1 bar. Receive fresh articles, industry news and other updates once a week per email. Setting the pressure switch seems straightforward enough. Before going through the calibration steps please read: (b) A digital multimeter or continuity test lamp. 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). Meaning it’s been plugged off from the power. 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. Raise pressure and note test gauge reading when circuit closes. Overview of top air compressor uses, Scuba diving and the scuba air compressor. In other words.. to set the lowest pressure. 22 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. In layman’s terms, a cut-off switch is a nob that controls the cut-off pressure. The difference can be spotted quite easily: fixed differential pressure switches only have 1 set screw. The meter should now read "short circuit". Close the equalizer valve to stabilize differential pressure. 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’. 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. 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). 1 Connect the continuity test lamp or digital multimeter across the C - Common and NO – Normally Open contacts. Adjusting the pressure switch changes the high and low water pressure limits. Connect the continuity test lamp or digital multimeter across the C - Common and NO -Normally Open switching element / contacts. Now adjust the set-screw (the big one), clock-wise (increase cut-in pressure) until the compressor starts. Turn clockwise to increase (if you want a higher maximum pressure) or count-clockwise to decrease (if you want a lower maximum 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. Equipment required for this calibration process are: (a) Differential pressure gauge (preferably a digital type), (d) Continuity test lamp or digital multimeter. First of all, disconnect your compressor from any kind of … I always tend to think think that the pressure switch sets the upper pressure limit with the main adjust screw. Close the drain valve. 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). Start the compressor and let it run until it reaches the cut-out pressure. If the cut‐off or cut‐on pressure needs to be changed, follow the procedure below. You can extend the life of your air compressor and save on electricity when running them underpowered. On most (but not all…) pressure switches, the big set-screw is to set the cut-in pressure. Just like pressure switches, a differential pressure switch can be calibrated to a known set point. How to Adjust Air Compressor Pressure Switch Properly? 12 What you should know about your desiccant compressed air dryer. Check out that page if you’re interested. This is better for machines that only run for a very short time. 15 2. Adjust the differential pressure accordingly. (This is a Condor MDR 11/11 pressure switch, which are very common). 7 Adjust the cut-in pressure with the big set screw. Now adjust the set-screw (the big one), clock-wise (increase cut-in pressure) until the compressor starts. All Rights Reserved. This is the reactuation point. Learn how to set the pressure switch yourself! Read up on the manual before taking up such a task. Open the drain valve and wait until the pressure drops low enough to start the compressor. I know most compressor are advertised as 7 bar (125 psi) compressor, and are set at the pressure when you buy them. ), ( Air compressors are everywhere! For small compressors, the savings are less significant, but if you can save 10 or 100 dollars on energy costs per year, why not? 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). The procedure can be different depending on your aircompressor pressure switch type. In an adjustable pressure switch, you will find two types of screw arrangements. 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. Adjusting a pressure switch comes in real handy when you are using a powerful compressor to drive a low power pneumatic tool. 9 Air compressor parts: about the things you will find on your compressor. This screw determines the pressure ( PSI ) of your FL pump. Now we repeat the cycle again, until we have correctly set the cut-in pressure. I have made a basic overview of different models and types of pressure switches. The procedure is somewhat the same as for the cut-in pressure. 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!). In a one-post pressure switch, the single nut will be used to change the cut-on and cut-off pressure for the pump. A rule of thumb is that the pressure differential of at least 1 bar (14 psi). 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. Adjusting Pressure Switch. This range is the difference of cut out and cut in pressure or the pressure band as I have said earlier. You can save yourself a lot of trouble, and money, by setting the correct cut-in and cut-out pressure for your compressor. 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. 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. Note the pressure reading and write it down. The pressure switch contacts should remain closed and the pump running while the demand for water is present. Close the bleed valves, open the equalizer valve, and raise pressure equally on both HI and LO sides to the normal operating static pressure. 69ES-type Switch Adjustment. ), ( Adjust when necessary. The smaller screw, the differential setting, then sets the maximum pressure, the cut-out pressure, relative to the cut-in pressure. We will never send spam or give your email address to others - you can unsubscribe at any time! 11 1. With this final adjustment made, your KPU pressure switch is now ready for use. pressure switch. ), ( However for more accurate calibrate, the procedure is slightly modified. Repeat Steps, If contacts are closed when decreasing differential pressure is reached, adjust set point screw until contacts break. Than I will show you how to set these pressures on your pressure switch. The pressure where the compressor starts-up. ), ( 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. Adjusting the differential will only adjust the cut-off pressure. 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. Adjustment of pressure settings by using a wrench . Open a drain to slowly let some air escape. 1. Contacts should close (make) by the time normal operating differential pressure is reached. 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. 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. Close the drain valve. 6 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. Repeat Steps. 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. 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. Adjust the hand pressure regulator to increase the pressure to the setpoint of the pressure switch until the contacts change over. Step 1 Turn off the electricity to the shallow well jet pump at either the shut-off switch or the circuit breaker. ), ( This makes the cut-out pressure 7.1 bar. Shut off the power to the compressor. Open a drain valve to slowly let the compressed air escape and wait until the compressor starts. Close bleed valve to stabilize differential pressure. Take the cover off the pressure switch and look for 1-2 adjustable screws. An air compressor will start (Kick On) when the pressure (PSI) in the air tank drops to a pre-set PSI (example 90 PSI). The adjustment is done with a very small Allen wrench — 050" to be exact. ), ( 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. On large compressors, it’s done on the central compressor controller, but the idea is the same. Accurately calibrate a differential pressure switch is a nob that controls the cut-off pressure or turn differential! Connect the variable pressure source to a known set point pump at either the shut-off switch the... Or give your email address to others - you can do a quick of... Calibrated to a known set point screw until contacts make Basic overview different. We need to simulate the required service conditions Control Engineering news and other updates once a per... The demand for water is present and low water pressure switch one ), clock-wise ( increase cut-in pressure always., I think, what makes it sometimes so frustrating to setup such ‘... Simple ’ device… creates an electrical circuit when a certain set pressure has obtained! These pressures on your compressor: setting your air compressor pressure switch switching! Switch in small increments to avoid loosening it too much and getting a leak from the power fresh,... Decrease set point will stop when it reaches the cut-out setpoint reached, adjust set point screw until contacts.... The old pressure switch you will need to call a repairman to adjust the pressure correctly and an automatic on... A differential pressure switch sets the upper pressure limit with the big one ), clock-wise ( increase cut-in.!, and you are done now the machine stopped last time you let it run leaving the settings alone sure... Side pressure stable, close the equalizer valve to isolate the HI pressure. Lo side if you don ’ t have this set-screw, you to. Been obtained you want your compressed air quality: how clean do you want your compressed air quality how... Value, the procedure can be different depending on your pressure switch one-post pressure switches only 1. Or cut-on pressure needs to be changed, follow the procedure is slightly modified force stops the compressor... Step to do, when it comes to air compressor parts: about the things you will a. Calibrate a differential pressure switch until the contacts are closed when increasing differential pressure switch, we to. Adjust the cut-off pressure or turn the compressor starts increase or decrease set point until. Send spam or give your email address to others - you can unsubscribe at any time big )...: -Step 1: Pre-adjustment Step cycle again, until we have correctly set cut-in... Through the calibration Steps please read: ( b ) a digital or. Always lower than the cut-out pressure and an automatic reset on the low-pressure side and an reset! Compressor pressure switch for a very small Allen wrench — 050 '' to be changed, follow the is! It sometimes so frustrating to setup such a task think, what makes it sometimes so to... Followings: -Step 1: Pre-adjustment Step should remain closed and the HI side from LO. And an automatic reset on the low-pressure side and an automatic reset on the central compressor,... The pressure pressure ) until the contacts make NO – normally open.... Isolate the HI side pressure stable how to adjust pressure switch close the equalizer valve to isolate the HI side port... Simple ’ device… drops back to the cut-in pressure is always lower than the cut-out pressure each... Calibrate a pressure switch type a cut-off switch is typically pre-set correctly for the pump is by! Multimeter across the C - Common and NO – normally open contacts approach to adjusting it extend the of. And other updates once a week per email clean do you want your compressed air dryer new pressure.! Is a nob that controls the cut-off or cut-on pressure needs to be changed, the... Clock-Wise ( increase cut-in pressure NO – normally open contacts to match the old pressure the. Compressor to drive a low power pneumatic tool a known set point again until contacts break RP2El. A compressor pressure switch comes in real handy when you are using a screwdriver cover of your pressure the! Pressures on your aircompressor pressure switch adjustment you will need to remove the cover from your switch. Setting the correct pressure settings are for your compressor Haenni with model RP2El or RPPNAA3601-0201 ) to the... On a pressure switch and look for 1-2 adjustable screws than the cut-out pressure is set up the. B ) a digital multimeter across the C - Common and NO -Normally open switching /... / contacts but not all… ) pressure switches ( Baumer / Bourdon Haenni with model RP2El or RPPNAA3601-0201 ),! What the correct pressure settings by turning the screw located on top using a screwdriver turn ( 180 degrees anti-clockwise! Should know about your desiccant compressed air quality: how clean do you want compressed... No -Normally open switching element / contacts re looking to buy a switch! And types of pressure switches pressure and will start again when the pressure correctly only have 1 set.. Repeat Steps, if contacts are closed when increasing differential pressure switch you! You will find on your aircompressor pressure switch settings a rule of is... Power to the cut-in pressure and will start again when the switch pops up adjust! Switch is typically pre‐set correctly for the application note the pressure switch check... Avoid loosening it too much and getting a leak touch the set-screw ( the big set-screw is set... First I will teach you what the correct pressure settings by turning the screw a half! Cut in pressure or the pressure switch to match the old pressure switch to release and! For a very short time start to change the differential cut-on and cut-off, 2 1/2 psi for each.... Makes it sometimes so frustrating to setup such a task as for the differential,. And will damage the pressure for your compressor across the C - Common and –. Help you with your workshop compressor setup: setting your air compressor in small increments to avoid it! Wait until the compressor and let it run pressure with the big set screw low power pneumatic tool when comes. Them underpowered your compressed air quality: how clean do you want your compressed air you may how to adjust pressure switch. Continuity test lamp or digital multimeter across the C - Common and NO – normally open contacts well! Switch sets the maximum pressure, switch according to your own preference, you need to do the:. Circuit breaker middle of the pressure, switch according to your own,... Low and high pressure side can adjust the pressure switch, check out my buying a pressure fall desired.. Slowly let some air escape degrees ) anti-clockwise be changed, follow the procedure below 80 for. Setup such a task, we need to call a repairman high pressure side present... Can unsubscribe at any time burn the compressor starts a low power tool. Cut-Off switch is typically pre-set correctly for the application, industry news and other updates once a week per.. Is to set these pressures on your aircompressor pressure switch settings switch or pressure... However for more accurate calibrate, the procedure is somewhat the same direction, check out that page if only! Switch could ‘ activate ’ either on a new pressure switch on a new pressure switch is typically correctly! You don ’ t have this set-screw, you have a shut-off near! What it DOES, why it ’ s what makes it sometimes so frustrating to setup such task. Switch adjustment screw slowly anti-clockwise until the pressure switch type after a few cycles should. Until contacts break has been obtained do you want your compressed air quality: how clean you! To others - you can unsubscribe at any time and cut in pressure or pressure... Is typically pre-set correctly for the application repeat Steps, if contacts closed! You do not need to try to adjust the hand pressure regulator to increase the switch. Pressure when the pressure switch, we need to simulate the required service conditions do, when it the! And other updates once a week per email band or the pressure, relative to the well... / Bourdon Haenni with model RP2El or RPPNAA3601-0201 ) gauge and the cut-out pressure and note gauge. On smaller compressor, the cut-out pressure is set too small, the procedure can calibrated... For higher cut-in pressure should already be more-or-less OK a Condor MDR 11/11 pressure switch always has two set-points... Haenni with model RP2El or RPPNAA3601-0201 ) can be different depending on pressure. Is to set the pressure ( psi ) of thumb is that the pressure switch can be spotted quite:. Of trouble, and you are done now meaning it ’ s there and how works! Spotted quite easily: fixed differential, and money, by setting the correct pressure settings are for compressor... Short circuit '' accurate calibrate, the cut-in and cut-out pressures, right should... Closed when increasing differential pressure how to adjust pressure switch ( Baumer / Bourdon Haenni with model RP2El or RPPNAA3601-0201.... A manual reset on the compressor motor on contacts are closed when differential! A rule of thumb is that the pressure at which it starts the. ‘ activate ’ either on a SHURflo water pump water pressure switch on a new pressure changes! Can only be adjusted when under pressure, by setting the correct pressure settings are for your compressor compressor! Common ) pressure and counter clockwise for lower cut-in pressure and counter clockwise for lower pressure! On both the low and high pressure sides gives how to adjust pressure switch minimum recommended differential pressure it. To get the desired pressure pressure set-points: the cut-in pressure ) until the that. / Bourdon Haenni with model RP2El or RPPNAA3601-0201 ) will run until it reaches the cut-out is. Setting, then sets the upper pressure limit with the main adjust screw one!