The Series CFS2 Cable Float Switchis a mechanically actuated floating switchintended to activate electrical components, usually pumps, to start and stopautomatically. The CFS2 is perfect for simple level control of liquids for filling ordraining reservoirs and tanks. Float switches such as the CFS2 are the mostuniversally used for pump automation due to their high reliability, economicalpricing, and easy installation. Counterweights and cable hangers are available tosuit a variety of mounting applications. Optional cables available include those withUL/CSA approval, higher chemical compatibility, high temperature durability, oilresistance, and drinking water suitability. Contact factory for piggyback plug option,gold contact switch option and cable length options ranging from 10 to 70 ft (3.04to 21.34 m).Series CFS2 Cable Float SwitchSpecifications - Installation and Operating InstructionsBulletin L-CFS2DWYER INSTRUMENTS, INC. Phone: 219/879-8000www.dwyer-inst.comP.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057e-mail: info@dwyer-inst.comSPECIFICATIONSService: Compatible liquids.Wetted Materials: Housing: Polypropylene; Cable: CFS2-XXPXX-XX: PVC;CFS2-XXNXX-XX: Neoprene;CFS2-XXSXX-XX: 3x16 AWG SJOW;CFS2-XXTXX-XX: Rubber compound EM7 quality ;CFS2-XXWXX-XX: EPDM ethylene propylene.Temperature Limits: 32 to 122°F (0 to 50°C).Pressure Limits: 14.5 psi (1 bar).Enclosure Rating: IP68.Switch Type: CFS2-DXXXX-XX: SPDT;CFS2-CXXXX-XX: SPST;CFS2-OXXXX-XX: SPST.Electrical Rating: CFS2-XXAXX-XX10 (4) A @ 250 VAC;CFS2-XXBXX-XX10 (8)A @ 250 VAC;CFS2-XXCXX-XX10 (8)A @ 250 VAC;10 (6)A @ 400 VAC;CFS2-XXDXX-XX1 HP @ 125 VAC 16 FLA;2 HP @ 250 VAC 12 FLA;CFS2-XXEXX-XX0.05 A @ 250 VAC.Shipping Weight:Housing: 5.43 oz (154 g);Cable: 0.77 oz (21.27 g) per foot.Agency Approvals: CFS2-XGDSX-XX: UL and CSA approved, all others CE.5-5/32[131.00]1-41/64[41.50]6-15/64[158.50]4-9/64[105.00]3-3/16[81.00]L-CFS2:SSS-1000 12/8/10 8:39 AM Page 1INSTALLATION INSTRUCTIONSThe basic operating principle of the CFS2 is very simple. As fluid level rises the floatwill also rise, resulting in a tilt of the micro-switch located inside the housing. This tiltwill generate a signal that can be used to actuate a motor or signal an indicator alarm.To ensure the proper function of the CFS2, it is necessary to secure the electric cableinside the tank or well as illustrated in Figures 1 and 2. The length of the cablemeasured between the fixture point and the body of the CFS2 determines the totalextension of the float and also the resulting distance between the pump stopping andstarting level. It is essential to ensure that there are no obstructions in the CFS2operational area before operation. During operation, adjustments to the CFS2 cablemust not be made under any circumstances, due to the fact that any unwantedcable connections made while the CFS2 is immersed in water can lead to electricshock. There are two installation options for this cable float switch. One method is tofix the cable of the CFS2 to the reservoir or container with the use of a small clamp,another technique would be to attach the accessory A-457 counterweight to the cableof the float switch a desired distance between the highest and lowest level desired. Note:With the use of the counterweight, the length of cable between the float andfixed point (starting and stopping indication) can be freely adjusted. ELECTRICAL CONNECTIONSThe Series CFS2 features a variety of different cable options. One of these optionsincludes the selection between SPST and SPDT. SPST, single pole single throw,allows a single operating function with the choice of operation on increasing level(NC/filling) or operation on decreasing level (NO/emptying), depending on the modelselection. SPDT, single pole double throw allows for operation of both increasing anddecreasing level, depending on the connections made between the terminals of themicro-switch and the cable. SPDT, which is a four-conductor cable (ground option) ora three-conductor cable (without ground option), has one lead that is common, onethat is normally open (NO), and the other that is normally closed (NC), for the properconnections of these conductors please refer to the wiring diagrams in Figures 3 to12. Figure 2-FillingFigure 1-EmpytingWhen making the connections described above, ensure that themaximum motor power does not exceed the values indicated onthe level switch. The power supply cable is an important part of the CFS2. Should thecable appear to be damaged, discontinue use immediately and proceed to replace theunit. The yellow/green wire found on some units is the ground wire and must beconnected to a suitable ground terminal with the dimension greater than 1 mm2. Theterminal used must also be protected against accidental break.NOTICEL-CFS2:SSS-1000 12/8/10 8:39 AM Page 23 x 1 CABLEBROWNBLUELNCOMBROWNBLUELNCOMBROWNBLACKLNCOMN.O.N.C.BLUEBROWNBLACKLNCOMN.O.N.C.BLUEYELLOWGREENBROWNBLUELNCOMYELLOWGREENBROWNBLUELNCOMBROWNBLACKLNCOMN.O.N.C.BLUEYELLOWGREENBROWNBLACKLNCOMN.O.N.C.BLUEGREENYELLOWGREENWHITEBLACKLNCOMGREENWHITEBLACKLNCOMCFS2-ONXXX-XXCFS2-DNXXX-XXCFS2-OGXXX-XXCFS2-DGXXX-XXFigure 11-Emptying (NO) FunctionFigure 12-Filling (NC) FunctionCFS2-DGXXX-XXCFS2-CGXXX-XXCFS2-DNXXX-XXFigure 4-Filling (NC) FunctionFigure 3-Emptying (NO) FunctionFigure 5-Double Function (Emptying (NO))Figure 7-Emptying (NO) FunctionFigure 9-Double Function (Emptying (NO))CFS2-CNXXX-XXFigure 6-Double Function (Filling (NC))Figure 8-Filling (NC) FunctionFigure 10-Double Function (Filling (NC))CFS2-OGESX-XXCFS2-CGESX-XX2 x 1 CABLE3G1 CABLE4G1 CABLESJOW 3 x 16 AWG CABLE (UL APPROVED)Correctly insulate any wire not in use!WIRING DIAGRAMSL-CFS2:SSS-1000 12/8/10 8:39 AM Page 3INSTALLATION OF COUNTERWEIGHTFor correct counterweight installation, refer to the following procedure as well asthe illustration in Figure 13.1. Insert the cable into the counterweight, turning it. This will result in the detachment of the plastic ring inserted in the mouth (if necessary use a screwdriver to aid in the detachment of the ring). Place the ring at the point on the cable where the counterweight is to be attached.2. Attach the counterweight on the ring by turning it and using moderate pressure. (Counterweight sold separately).MAINTENANCE & REPAIRInspect and clean wetted parts with water or damp cloth at regular intervals.Disassembly or modifications made by the user will void the warranty and couldimpair the continued safety of the product. If repair is required obtain a ReturnGoods Authorization (RGA) number and send the unit, freight prepaid, to theaddress below. Please include a detailed description of the problem and conditionsunder which the problem was encountered.Dwyer Instruments, Inc.Attn: Repair Department102 Indiana Hwy 212Michigan City, IN 46361DWYER INSTRUMENTS, INC. Phone: 219/879-8000www.dwyer-inst.comP.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057e-mail: info@dwyer-inst.com©Copyright 2010 Dwyer Instruments, Inc.Printed in U.S.A. 12/10FR# R3-443853-00Figure 13-Counterweight InstallationL-CFS2:SSS-1000 12/8/10 8:39 AM Page 4Next >