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Fig. 3 shows a typical wiring diagram for a three-wire, single- phase installation. Note that a magnetic contactor must be used if the pressure switch electrical rating is not sufficient to handle the submersible motor electrical rating. The pressure switch would then be incorporated into a pilot circuit to control the magnetic contactor. Make the connections at the control box in accordance with the wiring diagram in the control box to avoid damage to the motor. FIGURE 3 - 3-WIRE, 1 Phase, 1/3 thru 15 HP Pump Wiring Diagram Note: Order of red, yellow and black may vary from control box to control box. Pressure Switch (for pilot circuit) Always connect like colors. If Magnetic Contactor is usedfor starting. RedYellow BlackPressure Switch (for direct switching) ORMagnetic Contactor (w/ pilot circuit) L1 L2 R Y B Single Phase Control Box Circuit Breaker or Fused Disconnect Switch Incoming 1 Phase Power 1 Phase Sumbersible Motor 9. A three-phase pump does not require a motor control box . Fig. 4 shows a typical wiring diagram for a 3wire, three-phase installation. A magnetic contractor with 3-leg protection having quick-trip ambient compensated overload relays must be used. FIGURE 4 - 3-Wire, 3 Phase, 1-1/2 thru 50 HP Pump Wiring Diagram Pressure Switch Circuit Breaker OR Fused Disconnect Switch Magnetic Contactor w/ 3-leg protection having quick-trip ambient conpensated overload relays Incoming 3 Phase Power 3 Phase Submersible Motor 10. Use an ohmeter to make continuity and insulation checks after the installation is completed. 11. Place the additional pump nameplate onto the submersible label and place both onto disconnect switch or circuit breaker box for future reference. WELL TEST Check the pump and well performance before making the final connection to the discharge system. 1. Install a gate valve on the end of the pipe. Partially open the valve. 2. Start the pump. 3. Open valve gradually to give full flow. 4. If the discharge is not clear, let the pump run until water clears. If water does not clear in 30 minutes, stop the pump and take the necessary steps to correct the condition. After the water has appeared clear, check for sand by discharging into a clean bucket or suitable container. 5. Close valve until maximum required system flow rate is obtained (this should correspond to the cut- in pressure of the pressure switch). Ensure that the output of the pump at this setting is not greater than the yield of the well. This can be checked by monitoring the well drawdown level and ensuring tht the level is stable at the maximum required system fl ow rate. CAUTION Never run pump unless it’s completely submerged in water. If run without water, the pump and motor could be damaged. Note also that air drawn into the pump can cause an airlock under certain conditions. LOW-YIELDING WELL A low-yielding well exists when the output from the pump is greater than the yield of the well. It can reduce the water level to the suction screen so that a mixture of air and water enters the pump. Pumping may stop since the pump cannot generate pressure with insufficient water. In this case, the column of water already in the drop pipe holds the check valve closed and an airlock may develop inside the pump. Because the conditions ensure neither adequate lubrication of the pump nor proper cooling for the motor, damage can result if power is not cut off quickly. use one or more of the following methods to correct and/or protect this installation. 1. Install additional length of drop pipe to place pump lower in well if possible. 2. Install a Franklin Pumptec or similar electronic drawdown sensor. 3. Install a floatless liquid level control. This device consists of an electrical relay activated by currents flowing through the ground-return circuits of electrodes hung in the well. The lower(STOP) electrode, just above the pump, ensures that the water level can never be pumped down to the suction screen. The upper(START) electrode, just below the lowest static water level, ensures that the pump can start again as soon as the well has recovered. A floatless liquid level control works in series with the pressure switch. Refer to the manufacturers instructions provided with control. 4. Install a flow control valve in the discharge line upstream from the pressure switch. This restricts the output from the pump without affecting the rate that water can be drawn from the pressure tank. Nevertheless, a heavy demand for water could empty the pressure tank, so a tank with a bonded diaphragm, air cell, or water bag is recommended. 5. Install a smaller pump to avoid over pumping the well. Have dealer size pump to the well yield. 6. Install a low-pressure cut-off switch. A low pressure cut off switch, or a pressure switch with such an arrangement built in, protects a shallow-well pump from losing its prime, but it does not always provide satisfactory protection to a submersible pump from the effects of over pumping the well. This is because it...
Questo manuale è adatto anche per i modelli :Plumbing - Submersible Well Pump (183.01 kb)