Liberty Pumps 441 - Manual (Page 7)

INSTALLATION cont.
1. Make a second cut in the discharge pipe at the pencil mark made in step 1, on Page 4, and set the cut-off piece
of discharge pipe aside. See Figures 1 and 6.
2. Wrap the threads of the close nipple (Key No. 2 on Page 12) and backup pump (Key No.4) counterclockwise
with 2 turns of Teflon TM tape.
3. Thread the check valve onto the backup pump discharge ensuring that the valve housing and inner valve flap
are oriented correctly. See Figure 5.
4. Thread the close pipe nipple into the check valve.
5. To thread the tee (Key No. 1) onto the close nipple. If needed, hold the check valve with the channel locks,
insert the screwdriver into the tee for leverage, and tighten the tee with the screwdriver. Finish with the tee in a
straight up and down (vertical) position.
6. Clean the pipe ends with the cloth towel.
7. Glue the cut-off piece of discharge pipe into the top of the tee.
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.
NOTICE: If your pipe is 1-1/4”, you will need to glue the reducer bushings (Key No. 12) into the tee and glue the pipe
into the bushing. Place the assembly onto the primary discharge pipe. Do not glue the tee onto the primary pump
discharge pipe at this time as it will need to be removed later.
8. Mount the back-up pump float switch assembly (Key No. 6) loosely to the discharge pipe per steps shown on
pages 6 and 7. Approximately 2.5” (63.5 mm) of cord length should be left between the float and the clamp. Do
not tighten the clamp at this time as adjustments may be needed later.
Cut the Discharge Pipe:
1. Put the double pump assembly
into the sump pit.
NOTICE: The discharge pipe now
overlaps the discharge pipe that
leads outside.
2. Mark the discharge pipe where it
should be cut. Be sure to leave
a 1/4” air gap between the ends
of the pipes. This gap will absorb
the noise from vibration and
allow for flexibility.
3. Make the third cut. See Figure 7.
TRIAL ASSEMBLY OF
DOUBLE PUMP
ASSEMBLY IN THE
SUMP PIT:
1. Connect the pump discharge
pipe to the exterior discharge
pipe with a rubber coupling and
clamps. Do not tighten the
clamps until all the final
adjustments are complete.
©Copyright 2009 Liberty Pumps Inc. All rights reserved 7
Note: Always install the back-up sump pump as close to the bottom
of the sump pit as possible.
Figure 7 – Make the third cut to remove the excess discharge pipe.
2. Make the final adjustments. Make sure the pumps and the switches do not interfere with each other. Make sure
there is plenty of room for the float switches to either swing or to move up and down from their “off” to their “on”
positions.