Assessments - 3, GPA: 4 ( )

Fabricante : Bosch Arquivo Tamanho: 1.17 mb Arquivo Nome : Língua de Ensino:

As the liquid level continues to rise, the “PUMP ON” float tilts. This switch closes, starting the pump. 2. The pump runs until the liquid level falls below the “PUMP OFF” float, emptying the wet well. 3. In the event of a malfunctioning float switch, control relay or pump, the liquid level rises and tilts the “HIGH LEVEL ALARM” float. The alarm system will activate. 4-4.3 FLOAT SEQUENCE-DUPLEX (MANUAL MODELS) 1. As the liquid level in the wet well rises, the “PUMP OFF” tilts, closing the switch. As the liquid level continues to rise, the “LEAD PUMP ON” float tilts. This switch closes, starting the lead pump. The pump runs until the liquid level falls below the “PUMP OFF” float, emptying the wet well. 2. On the next rise of the liquid level, the other pump will start on the “LEAD PUMP ON” signal. The pumps will continue to alternate their cycles. NOTE: No ON/OFF float switch differential should be set that will exceed 12 starts per hour. 3. If the liquid level rises to the “LAG PUMP ON" float, the second pump will start. Both pumps will run until the liquid falls below the “PUMP OFF” float, emptying the wet well. 4. In the event of a malfunctioning float switch, control relay or pump, the liquid level rises and tilts the “HIGH LEVEL ALARM” float. The alarm system will activate. 4-4.4 FLOAT SWITCH INSTALLATION The engineering drawings will normally specify the levels for pump start and stop and high level alarm. If they are not specified, these guidelines should be used to determine float switch locations. PIGGY BACK SWITCH (1-Float System) Pump Off: Factory set. (Float tether 4") Pump On: Factory set. (Float tether 4") SIMPLEX PUMP STATION (3-Float System) Pump Off: Level to top of motor housing. Pump On: Minimum 1-1/2 ft. above Pump Off Level. High Level Alarm: Minimum 1 ft. above pump ON level. Below influent pipe. DUPLEX PUMP STATION (4-Float System) Pump Off: Level to top of motor housing. Lead Pump On: Minimum 1-1/2 ft. above Pump Off level. Lag Pump On: Minimum 1 ft. above Lead Pump On level. High Level Alarm: Minimum 1 ft. above Lag Pump On level. Below influent pipe. 5. 5-1 OPERATION After the electrical and mechanical installations have been performed, the pump is ready for operation. No operational procedures are required except to apply rated power to the pump. There are no specific shutdown procedures beyond disconnecting the power supply. IF THE ROTATION OF A SINGLE PHASE PUMP IS INCORRECT, NOTIFY THE LIBERTY PRODUCT SERVICE DEPARTMENT IMMEDIATELY. DO NOT SWITCH THE POWER SUPPLY LEADS. DO NOT OPERATE THE PUMP. ALWAYS ENSURE THAT THE PUMP IS FREE OF WIRES OR OTHER OBSTRUCTIONS THAT MAY CAUSE HARM OR INJURY. 5-2 PERIODIC MAINTENANCE & LUBRICATION Liberty pumps are designed for long lasting, efficient and reliable service with a minimum of preventive maintenance checks. These checks are few but will add years of satisfactory service to the life of the pump. Maintenance checks should be performed at the intervals stated. Severe operating...

Baixe o seu

Para fazer o download, introduza 2 dígitos :