Liberty Pumps 441 - Manual (Page 6)

INSTALLATION cont.
Method A
The recommended method suggests installing both of the pumps on the floor of the sump pit. See Figure 4. The
minimum required sump basin diameter, at the bottom of the pit and the recommended depth of the sump basin is 18”.
Some additional materials you will need are a rubber coupling with clamps to fit your discharge pipe diameter, (2) 1-
1/4” 90° elbows, and (2) 1-1/4” close pipe nipples.
1. Make the second cut in the discharge pipe at the pencil mark as shown in Figure 1 on page 4, and in Figure 4,
on Page 5. Clean the pipe ends with a cloth towel and set the cut-off piece of discharge pipe aside.
2. If already assembled, remove the check valve assembly (Key No. 3 on page 12) from the battery back-up pump
discharge and set it aside. See Figure 5. The check valve assembly will be used later, during assembly.
3. Apply (2) wraps of Teflon tape to the discharge threads of the pump and thread a 90° elbow (purchased locally)
onto the discharge of the back-up pump.
4. Wrap the threads of all 3 of the close pipe nipples (Key No. 2) with 2 turns of Teflon™ tape and thread one of
them into the elbow. Set the other 2 aside.
5. Thread the check valve assembly, removed back in step 2, onto the close pipe nipple.
NOTICE: Make sure the check valve is installed in the correct direction. See the inset drawing in Figure 5.
6. Thread a close pipe nipple into the other end of the check valve.
7. Thread the second 90° elbow onto the pipe nipple.
©Copyright 2009 Liberty Pumps Inc. All rights reserved 6
Figure 6 – Method B installation diagram
8. Thread the last pipe nipple into the elbow.
9. Thread the tee onto the pipe nipple and set this assembly aside.
10. Install a short length of pipe into the top of the check valve in the primary pump discharge. See Figure 4.
NOTICE: There must be a check valve installed in the Primary Sump Pump discharge pipe between the tee
and the Primary Sump Pump. This will prevent recirculation into the Primary Pump when the Backup Sump
Pump comes on.
11. If your discharge pipe is 1-1/2”, you will not need the
reducer bushings. If your discharge pipe diameter is
1-1/4”, you will need to glue the reducer bushings into
the tee.
12. Slip the tee and the back-up pump subassembly onto
the short pipe exiting the primary pump.
13. Glue the cut off piece of pipe into the top of the tee
(with reducer bushing if 1-1/4” pipe).
14. Mount the preassembled vertical switch to the
discharge pipe above the tee with the provided clamp.
Adjustments may be needed later and can be
achieved by loosening the clamp and sliding the
switch bracket up or down on the discharge pipe to
attain the desired activation level.
15. Skip to the section “Cut the Discharge Pipe”, Page 8.
Method B
Method B suggests installing the back-up pump above the
primary sump pump. See Figure 6. The minimum required
sump basin diameter for this type of installation is 13.5” at
the bottom of the pit, and the minimum recommended depth
of the basin is 22”.