Installation Manual 7034000N Submersible Sewage Pumps LE and LEH-Series Models LE40-Series 4/10 hp LE50-Series 1/2 hp LE70-Series 3/4 hp LE100-Series 1 hp LEH100-Series 1 hp LEH150-Series 1-1/2 hp LEH200-Series 2 hp For pressure sewer applications, verify a Redundant Check Valve Assembly (curb stop and check valve) is installed between the pump discharge and the street main, as close to the public right-of-way as possible, on all installations to protect from system pressures.
Contents Sa fety Preca utions Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 | EN General Information . . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN Operating Constraints . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN Model Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN Inspection and Storage . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN Pump Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RISK OF FIRE Do not use an extension cord to power the product. Extension cords can overload both the product and extension cord supply wires. Overloaded wires will get very hot and can catch on fire. This product requires a separate, properly fused and grounded branch circuit, sized for the voltage and amperage requirements of the pump, as noted on the nameplate. Overloaded branch circuit wires will get very hot and can catch on fire.
The Uniform Plumbing Code® states that sewage systems shall have an audio and visual alarm that signals a malfunction of the system, to reduce the potential for property damage. Do not exert heavy pressure or run heavy equipment on the backfill material as this could cause the tank to collapse. Do not position the pump float directly under the inlet from drain tile or in the direct path of any incoming water. Keep pump upright. Do not allow pump to freeze.
Mounting, installation, and wiring connections are specific to the control panel used. Refer to the manufacturer’s instructions supplied with the unit. IMPORTANT: When connecting a new pump to an existing control panel, verify the panel is correctly sized and equipped for the pump. Control panels designed for use with specific pumps available from Liberty Pumps can be found at http://www.LibertyPumps.com/ Portals/0/Files/panel_selection_guide.pdf or contact Liberty Pumps.
Prepare New Sump [Basin] Excavation RISK OF SERIOUS INJURY OR DEATH Locate all overhead and underground utilities before excavating. Excavate the hole as small as possible, with a minimum recommended 8" diametrical clearance around the tank. Never place the basin directly in contact with rocks or other sharp objects. Place only fine, 1/8” to 3/4” pea gravel or 1/8” to 1/2” washed, crushed stone as bedding between the basin and the hole walls. Do not use sand or native soil as backfill.
Discharge A check valve is required to prevent the backflow of liquid after each pumping cycle. A gate valve should follow the check valve to allow periodic cleaning of the check valve or removal of the pump. The remainder of the discharge line should be as short as possible with a minimum number of turns to minimize friction head loss. Do not reduce the discharge to below that which is provided on the pump. Larger pipe sizes may be required to eliminate friction head loss over long runs.
Automatic Pump Direct Wiring 1. RISK OF SERIOUS INJURY OR DEATH In 208/230V installations, one side of the line going to the pump is always “hot”, whether the float switch is on or off. To avoid hazards, install a double pole disconnect near the pump installation.
1. 2. 3. 4. 5. 6. 7. 8. 9. Place both pumps in basin, making certain the mounting interface (i.e., guide rail, torque stop) is engaged correctly. The duplex control used will include 3 or 4 floats that will either be tethered to one of the discharge pipes or to an independent rod or bracket. Follow the duplex control manufacturer’s instructions provided with the device.
Quarterly Annually 1. Check pumps for corrosion and wear. 3. Inspect for proper check valve operation. 2. 4. 5. Check for free and unobstructed float switch operation and float switch condition. For multiple pumps, check for balanced operating times. Uneven times indicate a defective unit, float switch or control. Inspect the control panel for any presence of moisture in enclosure, loose connections, and general component condition. 1. Inspect and clean basin. Replace any defective components.
Table 2. Troubleshooting Matrix (continued) Problem Pump runs or hums, but does not pump. Possible Cause Discharge line blocked or restricted. Check discharge line for foreign material, including ice if discharge line passes through or into cold areas. Check valve is stuck closed or installed backward. Remove check valve(s) and examine for freedom of operation and proper installation. Gate or ball valve is closed. Open gate or ball valve. Total head is beyond pump's capability.
Table 2. Troubleshooting Matrix (continued) Problem Repeated tripping. Possible Cause Corrective Action Circuit protection underrated. Check rating and replace with proper size. Other appliance on same circuit. Pump requires separate circuit. Pump is connected to an extension cord or wiring is inadequate or compromised. Have an electrician check for proper wiring. Improper voltage. Have an electrician check all wiring for proper connections and adequate voltage and capacity. Obstruction in pump.
