Submersible Tank Pump

Transcription

1 Submersible Tank Pump Applications: Silent household pressure systems, garden irrigation, or water transfer. Performance Outline Pump Features High efficiency moulded impellers Stainless steel construction, shaft and casing Lower running costs, high performance Corrosion resistant and tough 40 Raincycle Heavy Duty Pump Head (metres) Flow (litres/minute) Supplied with 20m cable Mechanical seal with oil chamber Motor internally cooled Lightning protection Ready to install and run Highest quality motor protection Can run even partially submerged* No failure in storms *Maximum submergence: 20 metres

2 Submersible Tank Pump (Con t) Fig Installation examples Fig. 3 TM SPO pump with suction strainer in submerged installation Positional requirements The pump is suitable for both vertical and horizontal installation, however, the pump shaft should never fall below the horizontal plane, see fig. 2. Fig. 2 Max. 20 m 2 Allowed Not allowed Before the pump is submerged in the well or tank, make sure that the well/tank does not contain sand or solid sediment. Installation in well: Install the pump so that the pump inlet is at least 1 metre above the bottom of the well. Installation in tank: Place the pump on the bottom of the tank. The pump must not run dry. TM m Min. 150 mm Pos. Description 1 Straining wire 2 Non-return valve TM

3 Submersible Tank Pump (Con t) Fig. 4 SPO pump with base plate in dry installation 6.1 Motor protection Single-phase pumps: The pump incorporates a thermal overload switch and requires no additional motor protection. 1 When the motor has cooled to normal temperature, it will restart automatically. 2 Connect the pump supply cable as shown in fig. 5. Fig. 5 Pos. Description 1 Pipework support 2 Non-return valve 3 Drain plug 4 Pipework support 5 Non-return valve 6 Suction strainer TM ~ L N 3~ L1 L2 L3 Three-phase pumps: The pump must be connected to a motor starter. The set rated current of the motor starter must correspond to the electrical data stated on the pump nameplate. 6.2 Checking direction of rotation Applies to three-phase pumps only: The direction of rotation should be checked every time the pump is connected to a new installation: Proceed as follows: 1. Position the pump on a plane surface. 2. Start the pump and stop it immediately. 3. Observe the movement (jerk) of the pump when started (seen from the top of the pump). The direction of rotation is correct (clockwise) if the pump sleeve moves counter-clockwise, see fig. 6. Fig. 6 TM Electrical connection The electrical connection must be carried out by an authorized electrician in accordance with local regulations. The mains voltage and frequency stated on the pump nameplate should be compared with the actual electricity supply available. Before starting work on the pump/motor, make sure that the electricity supply has been switched off and that it cannot be accidentally switched on. The pump must be connected to an external mains switch with a minimum contact gap of 3 mm in all poles. The pump must be earthed. If it is not possible to check the direction of rotation as described above because the pump has already been installed, proceed as follows: 1. Start the pump and measure the quantity of water. 2. Stop the pump, switch off the electricity supply and interchange any two of the incoming supply wires. TM

4 Submersible Tank Pump (Con t) 3. Restart the pump and measure the quantity of water. 4. Stop the pump. 5. Compare the results taken under points 1 and 3. The connection which gave the larger quantity of water is the correct direction of rotation. 7. Start-up The SPO pump with base plate must be primed before starting. Remove the priming plug at the top of the pump and prime the pump. Make sure that both the pump and the suction pipe are filled with liquid. Switch on the electricity supply and wait until the liquid starts running out of the discharge pipe. If the pump does not operate satisfactorily, switch off the electricity supply and see section 10. Fault finding chart. 7.1 Adjustment of float switch The pump stop level is set by changing the free cable length between the float switch and the fixing point (clamp on the pump handle), see fig. 7, pos. B. It must be ensured, that the float switch can move freely. that the stop level does not fall below the pump suction strainer. Fig Operation Note: During operation, the pump suction strainer must always be completely submerged in the liquid to be pumped. If the pump has been used for liquids other than clean water, it should be flushed through with clean water immediately after use. 8.1 Periods of inactivity If the pump is taken out of operation for a long period, it should be drained. Pumps with base plate can be drained via the drain plug. 8.2 Frequency of starts and stops Maximum 30 per hour. 9. Maintenance and cleaning Before starting work on the pump/motor, make sure that the electricity supply has been switched off and that it cannot be accidentally switched on. During normal operation, the pump is maintenancefree. 9.1 Cleaning the pump suction strainer To clean the suction strainer, proceed as follows: 1. Place the pump in horizontal position. 2. Remove the suction strainer cover by slackening the three screws with a screwdriver. 3. Clean the inside of the suction strainer. 4. Check that the slots of the suction strainer are free from foreign bodies. 5. Refit the suction strainer cover and reinstall the pump. 9.2 Checking the motor shaft If the motor does not operate and the shaft does not rotate when the electricity supply is switched on or the float is activated, it must be checked whether all rotating parts can rotate freely. Proceed as follows: 1. Place the pump in horizontal position. 2. Remove the suction strainer cover by slackening the three screws with a screwdriver. 3. Slacken the self-locking nut and turn the motor shaft clockwise. 4. Refit the suction strainer cover and reinstall the pump. Min. 150 mm B TM / TM

5 Pump Fault Finding Fault Cause Remedy 1. The pump does not run. a) The fuses in the electric installation Replace the fuses. If the new ones blow too, are blown. the electric installation and the supply cable should be checked. b) The ELCB or the voltage-operated Cut in the circuit breaker. ELCB has tripped out. c) No electricity supply. Contact the electricity supply authorities. d) The motor protection has cut off Check whether the motor/pump is blocked. the electricity supply due to overload. e) The pump/supply cable is defective Repair or replace the pump cable f) The float switch is in Check the water level and the float dry-running position. switch for free move ability. g) The pumped is blocked. Check and clean the pump 2. The pump runs but a) The discharge valve is closed. Open the valve. gives no water b) No water or too low water level in well. Increase the installation depth of the pump (maximum 20 metres). Reduce the pump performance or replace the pump by a smaller capacity. c) The non-return valve is stuck I its Pull out the pump and clean or replace the closed position. valve. d) The suction strainer is choked up. Pull out the pump and clean the suction strainer and the impeller, if necessary, see section 9.1 Cleaning the pump suction strainer. e) The pump is defective. Repair or replace the pump. f) The pump has not been primed Prime the pump, see section 7. Start-up. (pump with base plate). 3. The pump runs at a) The drawdown is larger than anticipated. Increase the installation depth of the pump reduced capacity. (maximum 20 metres). Reduce the pump performance or replace the pump by a smaller capacity. b) The valves in the discharge pipe are Check and clean or replace the valves, if partly closed/ blocked. necessary. c) The discharge pipe is partly blocked Clean or replace the discharge pipe. by impurities. d) The non-return valve in the discharge Clean or replace the valve. pipe is partly blocked. e) The pump and discharge pipe are Pull out the pump. Check and clean or partly blocked by impurities. replace the pump, if necessary. Clean the pipes. f) The pump is defective. Repair or replace the pump. g) Leakage in pipework. Check and repair the pipework. h) The discharge pipe is defective. Replace the discharge pipe. i) Under voltage has occurred. Check the electricity supply.

6 Fault Cause Remedy 4. Frequent starts and stops a) The differential of the pressure switch Increase the differential. However, the stop between the start and stop pressures is pressure must not exceed the operating too small. pressure of the pressure tank and the start pressure should be high enough to ensure sufficient water supply. b) The float switch has not been Adjust the float switch to ensure suitable adjusted correctly. time between the cutting-in and cutting-out of the pump, see section 7.0 adjustment of float switch. c) The non-return valve is leaking or Clean or replace the non-return valve. stuck half-open. d) The supply voltage is unstable. Check the electricity supply. e) The motor temperature is too high. Check the water temperature. f) The pump is blocked. Clean the pump and check that the rotating parts of the pump can rotate freely. g) The precharge pressure of the pressure Adjust the tank precharge pressure in tank is too low. accordance with the installation and operating instructions supplied with the tank. h) Leaking taps or toilet Check/replace tap washes or toilet valves. i) The diaphragm of the tank is defective. Check and replace the pressure tank, if necessary. Disposal Disposal of this product or parts of it must be carried out according to the following guidelines: Use the local public or private waste collection service. In case such waste collection service does not exist or cannot handle the materials used in the product, please deliver the product or any hazardous materials from it to your nearest Grundfos company or service workshop.