Install Instructions

Typical Installation

This is a recommended vertical discharge installation only. Variations may apply.

A. Discharge: Using an adapter, connect the discharge pipe to the

threaded 2” or 3” port provided on the cover (or the 2” PVC nipple used

on side discharge models). IMPORTANT: Do not reduce the

discharge pipe size below that which is provided on the pump.

Sewage pumps should not be smaller than 2". In some applications, it

may be necessary to increase the pipe size to reduce friction losses.

Contact Liberty Pumps if you have questions regarding proper pipe sizes

and flow rates.

Install the remaining discharge line. In vertical discharge

applications, a union should be installed just above the cover to

facilitate pump removal if necessary (side discharge applications

are equipped with an in-basin union). In both vertical and side

discharge models, a check valve is recommended after the union

to prevent the backflow of liquid after each pumping cycle. A gate

or ball 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 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.

B. Vent: On vertical discharge models, a threaded 2” or 3” connection is provided on top of the cover which must be piped to the

existing building vent, or extended outside on its own standpipe. On both side and vertical discharge systems, the vent size should

be in accordance with applicable codes, but not less than the discharge size.

Note: Pro-Series systems shipped with steel pipe option have a rubber grommet seal on the discharge instead of female NPT

connections.

Vertical Discharge P380

3. Installation and Connections

Side Discharge P380