Craftsman 390.2522 Owner's Manual

Also see for 390.2519: Parts list

INSTALLATIONNOTICE: Use Teflon tape supplied with the pump or Plasto-Joint Stikl for making all pipe-thread connections to thepump itself. To avoid stress-cracking, do not use pipe jointcompounds on the pump.1. Wrap male pipe threads being attached to pump with oneor two layers of Teflon tape. Cover entire threaded por-tion of pipe.2. Do not overtighten threaded fittings in the plastic pump.Be sure you do not try to tighten joint past thread stop inpump port!3. If leaks occur, remove fittings, clean off old tape, rewrapwith one to two layers of tape and remake the connec-tion. If joint still leaks, replace the fittings (fittings may beundersized).4. Be sure to support all piping connected to the System.MAJOR COMPONENTS AND WHATTHEY DOTank and Air Volume ControlThe tank serves two functions. It provides a reservoir ofwater, some of which can be drawn through the house fix-ture before the pump must start, and it maintains a cushionof air under pressure.When Captive Air + Tanks are used, no air volume control isnecessary. This tank contains a permanent pre-charge of air.When a Standard Tank is used, an air volume control addsair to the tank when it is needed. See instructions includedwith Air Volume Control for details on installation and op-eration.Pressure SwitchThe pressure switch provides for automatic operation.MODEL NO. PUMP STARTS AT PUMP STOPS AT390.2519 40 Pounds 60 Pounds390.2522 40 Pounds 60 PoundsImpeller, Jet and Pressure RegulatorThe impeller of the pump rotates with the motor shaft, caus-ing the water to fly out from its rim by centrifugal force. Therotation of the impeller creates a vacuum which "puns" inmore water. Part of the water is diverted back to the jetwhere it again passes through the nozzle and venturi - cre-ating additional vacuum to draw in more water and deliver-ing it at high pressure to the impeller.In a deep well installation, the jet assembly is submergedin the well because the vertical distance to the water levelexceeds the suction lift of the pump.Adjustment of the pressure regulator causes the fightamount of water to be diverted back to the jet for the mostefficient operation._Lake Chemical Co., Chicago, BlinoisIn a shallow well installation, the jet assembly is attacheddirectly to the pump because the vacuum created will pullwater to the pump.The pressure regulator may be used to restrict the flow ofwater in a shallow well system if the SEARS convertiblepump produces more water than the well can produce.DEEP WELL PUMP INSTALLATION(Figures I & 2, Page 4)In a deep well installation, the jet assembly is submerged inthe well because the vertical distance to the water level ex-ceeds the suction lift of the pump. A single pipe system mustbe used in 2" and 3" wells. A double pipe system must beused in 4" or larger wells.Follow instructions packed with jet package for proper noz-zle and venturi combination for your ptmaping depth.DOUBLE PIPE JETWhen a double pipe jet is selected, 2 pipes are used in thewell. One is the suction pipe, and the other, the pressurepipe. Plastic pipe is ideal for double pipe installations, dueto its light weight mid easy installation.Use 100 ponnd flexible plastic pipe on horizontal jet pumps.TO INSTALL 4" DOUBLE PIPE JETFirst, inspect jet to make sure no foreign matter has enteredthe openings.Be certain no foreign matter enters pipe openings while in-stalling the unit.Plastic Pipe Installations1. Attach a foot valve (not furnished) to the jet with a shortnipple.2. Before installing, be certain foot valve operates freely.3. A special plastic pipe adapter is included with the jetwhich screws into the 1-1/4" suction tapping over theventuri.4. Assemble a plastic pipe adapter (not furnished) into 1"tapping in the jet body.5. Use sufficient length of plastic pipe to place the jet 10-15feet below the lowest drawdown water level. This is thelevel to which the water in the well will drop while beingpumped continuously.6. Tighten all hose clamps securely. A sanitary well seal is re-quired on top of the well casing. Use steel nipples and el-bows or specialized galvanized steel elbows to go throughthe well seat. Use plastic pipe adapters where special el-bows are not used.6