Liberty Pumps 441 Manuel D'installation page 8

5. Method A: The primary pump will stay in the pit with the
discharge pipe intact, unless a check valve is to be installed.
Continue to Assembly Method A. If installing a check valve,
continue to Step 6.
6. Methods B and C: The primary sump pump will need to be
separated from the discharge pipe and removed from pit.
To separate the primary pump from the discharge pipe:
a. For applications with rubber couplings, remove the
coupling clamp with a nut driver.
b. For applications without rubber couplings, cut the PVC
discharge pipe above the basement floor, at a
comfortable level. A new rubber coupling is needed for
reassembly. See Figure 3.
Note: The discharge pipe will be filled with water. Drain
the water from the discharge pipe assembly. Keep the
work area dry.
c. Use handle to lift the primary pump and discharge pipe
assembly out of the sump.
7. Continue to Back-up Pump Assembly.
Remove rubber
coupling (if present)
OR make 1st cut in
this area
Figure 3. Mark and Cut Pipe
– 8 –
Exterior
discharge
pipe
Support pipe
before cutting
Sump pit
Check valve
TURN ON water level of
Primary Pump
Mark pipe for reference
later
Copyright © Liberty Pumps, Inc. 2019 All rights reserved.
B a ck-up P um p A ssem bl y
RISK OF FIRE
 Use PVC cement in a well-ventilated area away from fire or
flames. Follow the PVC cement and primer manufacturer's
instructions.
Assembly Method A
Liberty Pumps recommends Method A for the most fail-safe
back-up pump system. The back-up pump is plumbed with a
separate discharge line. The minimum required sump basin
diameter is 18" at the bottom of the pit, and the minimum
recommended depth of the sump basin is 18".
IMPORTANT: A primary pump check valve is recommended.
Back-up Pump Installation (Method A)
•
Not to scale
•
Wiring omitted for clarity
Discharge pipe
5
WATER FLOW-
THRU VALVE
(the valve flap
opens away from
the pump outlet)
Figure 4. Installation Method A
1. Apply (2) wraps of thread seal tape to all threads.
2. If primary pump does not have a check valve, install one now.
Make sure the check valve is installed in the correct direction.
3. Thread a 90° elbow onto the discharge of the back-up pump.
Take care not to overtighten and strip threads.
4. Thread one of the close pipe nipples into the elbow.
5. Thread the check valve assembly onto the close pipe nipple.
IMPORTANT: Make sure the check valve is installed in the
correct direction. See the inset drawing in Figure 4.
6. Thread a close pipe nipple into the other end of the check
valve.
7. Connect a length of pipe into the top of the check valve in the
back-up pump discharge.
Back-up
pump
8
switch
(may vary)
7
1
6
Add close
pipe nipples
Check valve
as needed
assembly
(not supplied)
(provided)
5
1
4
1
1-1/4" Elbow
3
(not supplied)
Back-up pump
discharge port
4414000D