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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.
O
p
eration
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 environments will require
more frequent checks.
5-3 LUBRICATION
Ball Bearings: None required
Mechanical Seal: Lubricated by the motor oil
Seal Oil: 32W HIGH Detergent Oil Qty: 1 Gal