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i :'Installation Procedures 2. Lower the Pump Into the Well Make sure the electrical cables are not cut or damaged in any way when the pump is being lowered m the well Do not use the power cables to support the weight of the pump l To protect against surface water entering the well and contaminating the water source,the well should be finished off above grade utilizing a locally approved well seal or pilless adaptor unit We recommend that steel nser pipes always be used with the larger submersibles A pipe thread compound should be used on all points Make sure that the joints are adequately tightened in order to resist the tendency of the motor to loosen the points when stopping and starting The drop cable should be secured to the riser pipe at approximately every 10 ft/3 m to prevent sagging, pooping and possible cable damage Nylon cable clips or waterproof tape may be used The cable splice should be protected by securing it with clips or tape just above each joint ,� i IMPORTANT Plastic pipe tends to stretch k i"-, ,g-, under load This stretching must be taken into i "Z account when securing the cable to the riser `''I' pipe Leave three to four inches of slack between clips or taped points This tendency PQ` for for plastic pipe to stretch will also affect the xi �- �� :`��grr �3c,-�� calculation of the pump setting depth Asa � general rule,you can estimate that plastic pipe will stretch to approximately 2%of its length Yvk When plastic user pipe is used,it is f i recommended that a safety cable be attached t r to the pump to lower and raise it The discharge chamber of GRUNDFOS 4-inch submersibles is destgned to accommodate this cable (See Figures 1 &2) Figure 1 Figure 2 Check Valves A check valve should always be installed at the surface of the well and one at a maximum of 25 feet above static water level In addition for installations deeper than j 200 feet, check valves should be installed at no more than 200 foot intervals i Page 3 41 Page 12 I