Liberty Pumps XFL50 Serie Manuel D'installation page 6

For hazardous locations the control panel must be installed outside the hazardous area. Only approved controls that have intrinsically
safe float switch connections may be used for XFL – Series pumps. The control and power cables cannot be spliced; a junction box
may be used providing it is rated for hazardous locations and has approved cord connectors.
The water level in the sump is determined by the placement of the control floats and should be positioned such that the pump is
completely submerged. If this is not possible the minimum water depth should be 9 inches from the bottom of the sump. The upper
water level should be positioned to minimize pump starts. The alarm float should be above the turn on float switch but below any inlets.
No control should be set above the inlet to the sump.
For 3-Phase pumps, check for proper rotation before installing pump into basin.
Installation: After the pump(s) have been mounted and the cover sealed, install the remaining discharge line. A union
should be installed just above the cover to facilitate pump removal if necessary. A check valve is recommended after the
union 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 restrict the discharge to below 2" in
sewage applications. Larger pipe sizes may be required to eliminate friction head loss over long runs. Contact Liberty
Pumps or other qualified person if there are questions regarding proper pipe size and flow rates. Vent: A connection may
be provided on top of the cover which must be piped to the existing building vent, or extended outside on its own
standpipe. The vent size should be in accordance with applicable codes, but not less than the discharge size. Some
XFL-Series pumps come equipped with an air bleed hole to help prevent air lock. A small spray of water from this hole is
normal while pump is running.
When connecting an explosion - proof pump in hazardous locations using a rail system, it should be of a non-sparking
type design. Contact Liberty Pumps for available models such as GR22NS-FL.
Bottom View
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Check three phase pumps for proper
rotation prior to installing pump(s) in
basin. To change rotation, reverse any
two of the three power leads to the
pump. Code the
reconnection after installation.
wires for
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