Install Instructions

7034000N Copyright © Liberty Pumps, Inc. 2022 All rights reserved. 9 | EN
1. Place both pumps in basin, making certain the mounting
interface (i.e., guide rail, torque stop) is engaged correctly.
2. 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. Each
float switch must have adequate clearance to side wall of
basin and free, unobstructed movement throughout its
complete travel and must not contact the pump, piping, or
other objects. Minimum pump turn OFF level must not be set
below
Table 1 values.
3. Connect an individual discharge pipe to each pump. Do not
reduce the discharge to below that which is provided on the
pump. Sewage pumps should not be smaller than 2". Larger
pipe sizes may be required in some applications to reduce
friction head loss over long runs. Contact Liberty Pumps or
other qualified person if there are questions regarding proper
pipe size and flow rates.
4. A check valve on each discharge line, prior to tying into one
common line, is necessary to prevent the recycling of fluid
from one pump to the other. Depending on the basin height,
the check valves may either be inside or outside the basin. To
install inside basin, install check valve on each discharge pipe
now. To install outside basin, install in Step
7.
5. Mount and seal the basin cover.
6. Install unions or flexible connectors just above the cover on
each discharge to facilitate pump removal when necessary.
7. Install check valves on each discharge after the union and
prior to the gate valve to prevent backflow.
8. Install a gate valve after the check valve to allow for periodic
cleaning of the check valve and removal of pumps.
9. The remainder of the discharge line should be as short as
possible with a minimum number of turns to minimize friction
head loss. Larger pipe sizes may be required to eliminate
friction head loss over long runs.
10. Vent basin in accordance with applicable plumbing codes.
Operation
 Energizing the control panel or breaker for the first time is
potentially dangerous. Licensed electrical personnel should
be present when the panel or breaker is energized for the first
time. If faults caused by damage or poor installation practices
have not been detected, serious damage, injury or death can
result when power is applied.
Starting System
1. Verify all plumbing components are installed correctly and
functional. Verify all valves are open and ready for pump use.
2. Double check all wire connections. Re-tighten all factory and
field connections.
3. Ensure pump has no obstructions.
4. With all electrical and mechanical connections complete and
secure, turn on power to pump and control panel, if
applicable.
5. Verify operation of the pump, floats, and alarm circuits.
6. Run several cycles of water through the system to verify
correct control operation for the installation.
Be certain to complete adequate testing, especially on systems
with multiple pumps or custom control configurations.
Ma intena nce a nd Troubleshooting
 Accidental contact with electrically live parts, items, fluid, or
water can cause serious injury or death.
 Always disconnect pump(s) from power source(s) before
handling or making any adjustments to either the pump(s),
the pump system, or the control panel.
 Wear adequate Personal Protective Equipment when working
on pumps or piping that have been exposed to wastewater.
Sump and sewage pumps often handle materials that can
transmit illness or disease upon contact with skin and other
tissues.
 Do not enter a pump basin after it has been used. Sewage and
effluent can emit several gases that are poisonous.
 Verify correct 3-phase pump rotation before retuning to
service.
Maintenance
Check pump frequently for debris and/or build up that may
interfere with pump or float switch operation. As the motor is
oil-filled, no lubrication or other maintenance is required.
In the event the pump becomes clogged, the inlet screen can be
removed to gain access to the pump impeller. Once the
obstruction is removed, the anti-airlock hole should be cleaned.
To keep the pump/pump system operating smoothly, perform the
following routine checks:
Monthly
1. Pumps that are idle for more than a month in a dry basin
should have impellers manually operated through the breaker
panel monthly to lubricate the seals. For automatic models,
turn off the breaker, unplug the piggyback switch, and plug
the pump directly into the wall socket. Turn the breaker on
for 30
seconds, then turn the breaker off. Plug the piggyback
switch back in. Refer to
Figure 1 on page 7. Limit the
lubrication run time to less than one minute per pump.
2. Pumps that are idle in a wet basin must be removed—do not
store pump in wet basin.
RISK OF SERIOUS INJURY OR DEATH
RISK OF ELECTRIC SHOCK
RISK OF SERIOUS INJURY OR DEATH