Installation And Connections - Liberty Pumps Pro370 Serie Manual De Instrucciones

3. Installation and Connections

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).
(Vertical Discharge only)
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 P370 and P380 models, a threaded 2" or 3" connection is provided on top of the cover. On P680
models a 2" or 3" slip type Uni-Seal is provided. The vent 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.
P680
Vertical Discharge P380
Side Discharge P380
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