PS40 Series Supervisory Pressure Switch Features One or two switch models available Independent switch adjustment on two switch models, no tools needed Two 1/2 conduit/cable entrances Separate isolated wiring chambers Non-corrosive pressure connection Non-Conductive Enclosure Vds version available This document contains important information on the installation and operation of PS40 pressure switches. Please read all instructions carefully before beginning installation. A copy of this document is required by NFPA 72 to be maintained on site. Installation Technical Specifications The Potter PS40 Series Supervisory Pressure Actuated Switches are Two knockouts for 1/2 conduit provided. Individual switch Conduit Entrances designed primarily to detect an increase and/or decrease from normal compartments and ground screw suitable for dissimilar voltages system pressure in automatic fire sprinkler systems. Typical applications SPDT (Form C) are: air/nitrogen supervision in dry pipe and pre-action systems, pressure Contact Ratings 10.1 Amps at 125/250 VAC, 2.0 Amps at 30 VDC tanks, air supplies, and water supplies. The PS40-1 has one switch and One SPDT in PS40-1, Two SPDT in PS40-2 is factory set to activate at approximately 30 psi (2,1 bar) on a decrease Cover incorporates tamper resistant fastener that requires a special Cover Tamper in pressure. The PS40-2 has two switches. The Low switch is factory set key for removal. One key is supplied with each device. to activate at approximately 30 psi (2,1 bar) on a decrease in pressure. Typical 1 lb. at 10 psi (,07 at ,7 bar) Differential The High switch is factory set to activate at approximately 50 psi (3,5 4 lbs at 60 psi (,28 at 4,1 bar) bar) on an increase in pressure. NFPA 72 requires a supervisory signal Dimensions 3.78(9,6cm)Wx3.20(8,1cm)Dx4.22(10,7cm)H if the pressure increases or decreases by 10 psi from normal. The PS40 Cover: Weather/UV/Flame Resistant High Impact Composite is factory set for a normal air pressure of 40 psi. See section heading Enclosure Base: Die Cast Adjustments and Testing if other than factory set point is required. All parts have corrosion resistant finishes 1. Connect the PS40 to the system side of any shutoff or check valve. -40 F to 140F (-40C to 60C) Environmental NEMA 4/IP66 Rated Enclosure indoor or outdoor when used with 2. Apply Teflon tape to the threaded male connection on the device. Limitations NEMA 4 conduit fittings (Do not use pipe dope) PS40-1 operates on decrease at 30 psi (2,1 bar) 3. Device should be mounted in the upright position. (Threaded Factory Adjustment PS40-2 operates on increase at 50 psi (3,5 bar) and on decrease at 30 psi (2,1 bar) connection down) Maximum System 4. Tighten the device using a wrench on the flats on the device. 300 psi (20,68 bar) Pressure Pressure Connection Nylon 1/2 NPT male Pressure Range 10-60 psi (,7-4,1 bar) Service Use NFPA 13, 13D, 13R, 72 *Specifications subject to change without notice. Potter Electric Signal Company, LLC St. Louis, MO Phone: 866-956-0988 / Canada 888-882-1833 www.pottersignal.com 5400930 - REV H 2/20 PAGE 1 OF 4 DRAFT 1Incoming Outgoing PS40 Series Supervisory Pressure Switch Wiring Instructions Switch Clamping Plate Terminal Fig 2 1. Remove the tamper resistant screw with the special key provided. 2. If it is necessary to remove the sealed knockouts, carefully place a screwdriver on the edge of the knockout and sharply apply a force sufficient to dislodge the knockout plug. See Fig. 9. 3. Run wires through an approved conduit connector and affix the connector to the device. A NEMA-4 rated conduit fitting is required for outdoor use. 4. Connect the wires to the appropriate terminal connections for the service intended. See Figures 2,4,5 and 6. See Fig. 7 for two switch one conduit wiring. Adjustment and Testing NOTE: Testing the PS40 may activate other system connected devices. The operation of the pressure supervisory switch should be tested upon completion of installation and periodically thereafter in accordance with An uninsulated section of a single conductor should not be looped the applicable local, national and NFPA codes and standards and/or the around the terminal and serve as two separate connections. The authority having jurisdiction (manufacturer recommends quarterly or wire must be severed, thereby providing supervision of the more frequently). connection in the event that the wire becomes dislodged from The use of a Potter BVL (see product bulletin 5400799 for details) under the terminal. is recommended to facilitate setting and testing of the PS40 pressure switch. When a BVL (bleeder valve) is used, the pressure to the switch can be isolated and bled from the exhaust port on the BVL without Typical Sprinkler Applications affecting the supervisory pressure of the entire system. See Fig. 3. Fig 3 The operation point of the PS40 Pressure Switch can be adjusted to any PS40 SUPERVISORY PRESSURE SWITCH point between 10 and 60 psi (0,7 - 4,11 bar) by turning the adjustment knob(s) clockwise to raise the actuation point and counter clockwise to lower the actuation point. In the case of the PS40-2, both switches AIR LINE SHUT-OFF PS10 operate independent of each other. Each switch may be independently BLEEDER VALVE ALARM TEST PRESSURE adjusted to actuate at any point across the switch adjustment range. If the CHECK VALVE SWITCH VALVE BVL pressure needs to be adjusted from the factory settings, adjust the system WATER MOTOR pressure to the desired trip point. Use an ohmmeter on the appropriate GONG CHECK RBVS contact (COM and 2 for pressure decrease and COM and 1 for pressure VALVE DRY PIPE increase). Adjust the knurled knob until the meter changes state. At that VALVE point the switch is set for that particular pressure. Final adjustments should be verified with a pressure gauge. WATER The position of the top of the adjustment knob across to the printed DWG. 924-1A BY-PASS OS & Y TEST scale on the switch bracket can be used to provide an approximate visual VALVE VALVE reference of the pressure switch setting. Dimensions CAUTION Fig 1 Closing of any shutoff valves between the alarm check valve GROUND and the PS10 will render the PS10 inoperative. To comply with SCREWS 2.87 72.97 IBC, IFC, and NFPA-13, any such valve shall be electrically su- ADJUSTMENT 4.22 KNOB pervised with a supervisory switch such as Potter Model RBVS. 107.19 1/2 NPT 2.48 1.60 62.87 40.64 3.20 3.78 81.28 95.89 NOTE: To prevent leakage, apply Teflon tape sealant to male threads only. DWG 930-1 Potter Electric Signal Company, LLC St. Louis, MO Phone: 866-956-0988 / Canada 888-882-1833 www.pottersignal.com 5400930 - REV H 2/20 PAGE 2 OF 4 DRAFT 1