On this pressure switch, the adjusting nut in the small red circle is used to adjust the range of this switch. Just follow the simple steps that I have outlined below. 0000026432 00000 n If the pump is starting and stopping at too low a pressure, turn the larger nut clockwise. The second post allows adjustment of the cut-off pressure independently. endobj Position 3 provides an automatic reset on both the low and high pressure sides. 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. 0000028186 00000 n Safety and Identification of a Square D Pressure Switch Pull the plastic cover from the pressure switch by removing the single nut on top of the cover. 15 0 obj Make note of the pressure when the switch pops up and adjust the bolt as needed to get the desired pressure. (you turn clockwise to increase water level and pressure to the nozzles). 0000085301 00000 n The pressure switch is typically pre‐set correctly for the application. This pressure is the switch setpoint for a "rising" pressure. You can find out if the pressure switch is adjustable or not by looking inside of the pressure switch. Turning either of the adjusting nuts in a clockwise direction will increase the pressure settings, and the reverse if they are turned counter clockwise. 0000022501 00000 n Disclaimer: Air pressure switches are really sensitive devices. See image below. This is the reactuation point. To increase the cut-off and cut-on pressure, turn nut #1 clockwise. In an adjustable pressure switch, you will find two types of screw arrangements. Take note of the pressure markings on the switch as you adjust the nut. �5}�6׍�Wm�\h��hx��,��-���U�&j!�fə��)38wW�"���U�di���{w�rC!G�q��V�r�;�bix��@ [�e�c��^+�)��?�����כ���7�Ґ��۪v(���ؖ$���0��%���C�{���Lf�3�����潶�����Q��J��z��������l �?���vI|8O;�iq8�n��lُ]ʅ�!_{ZT�����Y5Ѐ�su��™B�-u�����C��"/��.K��\�ѫ�܃)��2 )\���Y����5u��|k����u�� �#ʏ The good news is, adjusting the pressure switch can sometimes compensate for this flow reduction and allow the heater to turn back on. 22 Before setting the cutout pressure point, you need to-first-set the cut-in pressure point. To adjust the Tecmark Pressure switch screw inwards to reduce the amount of pressure required and on the Balboa switch screw out to reduce the gap between the button and the switch. Be careful! How to Adjust a Pressure Switch Just adjust the … endobj The meter should read "open circuit". 0000002669 00000 n Adjust the hand pressure regulator to increase the pressure to the setpoint of the pressure switch until the contacts change over. 4 Note on Balboa switches - you can test the switch is working correctly by pushing it upwards, and if the switch is leaking or heavily corroded replace it. 0000001196 00000 n This setting adjusts the pressure level at which the pump shuts off. 0000009939 00000 n Tighten or loosen the screw until you reach the desired set point. You then angle the plow to that side and max it out watching the pressure rise until it reaches the highest reading. 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. The pressure on one side of the diaphragm will deflect the diaphragm and actuate the switch. Check your water level, filter(s), and make sure your pump is working correctly before attempting to adjust your pressure switch. <>stream Square D pump switch adjustment. Pump continues to run for up to 30 seconds after tap is turned off. The large nut adjustment is the easiest adjustment to make on the switch. The adjustment screws are indicated by the red circles in the picture. One-Post Pressure Switches These allow adjustment of the cut-on and cut-off pressure at the same time. Adjust just a little at a time and allow the pump to operate. %PDF-1.6 %���� #Z���x�*5jjtQ��נ' �TZo[9/_F�;d�F(F���&��� .J���*�O1��[�t�a�y�B�n~���,�i.b6���"t{�w��O��M@h �AA���[ 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). But if the vent pipe gets blocked or if certain parts in the system fail, then the pressure switch recognizes that there is no longer the proper negative pressure, and it turns on (closes the circuit) to stop the operation of the furnace. 0000000016 00000 n Step 3 The pressure switch contacts should remain closed and the pump running while the demand for water is present. 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. However for more accurate calibrate, the procedure is slightly modified. H�|SMo�@�ﯘ#��Ͳ���c��j�4m��C��ظ��xq����Y�G%�ev�y3�=E�P��_����M��S�. The pressure switch contacts should remain closed and the pump running while the demand for water is present. 0000025173 00000 n It is practically everywhere in your plant. Prior to adjusting the switch, follow safety precautions and look for any faults in the switch components. Turn the adjustment screw right, or clockwise, to increase the pressure switch's setting. Slowly reduce the pressure to the switch until the switch changes over from closed to normally open again. In a one-post pressure switch, the single nut will be used to change the cut-on and cut-off pressure for the pump. Range & Differential Adjustment on a Water Pressure Control Switch The (LARGER) RANGE Adjustment nut The larger nut (green arrow) on the larger spring in the pump pressure switch: changes cut-in AND cut-out simultaneously moving them both up (higher pressure) or down (lower pressure). This is not a problem. The adjustment is done with a very small Allen wrench — 050" to be exact. 11 0 obj It's sole purpose is to shut off the heater if low pressure (low water flow) occurs. Pull the release valve located directly below the pressure switch to release pressure and turn the compressor motor on. If opening the switch exposes voltages or energy that is not intrinsically safe, please follow the specified procedure for your plant. <>stream For example, if you have a pressure switch setting of 30/50 psi, you pressure measured at the top of the tank should read 28 psi. This is a characteristic of pressure switch systems caused by the dampening effect of the hot water heater or Adjust a Square D well pressure switch by turning it clockwise to raise the pressure and counter-clockwise to decrease the pressure. Most pressure switches are simply a micro-switch and an air diaphragm. ��q{��r�A���z�Qç�F6�B��,^����K��s����$i0���?�A%�7�6�᫐]�"���f��2�[ B�W3$�"2S�g�g��+�t�����E6m�T���v aqxϨ'Dq���vjS����T�X�Z��\�B�-v\$�O# a� Multimeter reads 1 lowest pressure at the same time ( PSI ) of your pressure switch have below! Different designs and models, there is a function of flow but there can be calibrated to a known point... 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