Pentair MYERS MBSP-3 Installation And Operation Manual page 8

INSTALLATION
INSTALLATION (TYPICAL): COMMON DISCHARGE
Unplug the primary sump pump before beginning this
procedure. Risk of electrical shock. Can shock,
burn, or kill.
1. Allow for over lap when cutting piping and run a trial (dry)
fitting before you glue.
2. If there is no check valve in the primary sump pump's
discharge, you will need to install one. You must also
install one in the BBU's discharge pipe (Figure 3). Make
sure that the check valve flow arrow points AWAY from the
pump it is protecting.
3. Use PTFE pipe thread sealant tape on male ends of
discharge pipe. Thread the 1-1/4" x 1-1/2" elbow (supplied)
onto the discharge. When tight, the elbow must point up.
4. If possible, position the BBU on the floor of the sump; be
sure that the two pumps do not touch each other and do
not interfere with switch operation.
NOTE: If debris or gravel is present in the bottom of the
sump pit that could get sucked up into the pump, set
both the primary sump pump and the BBU up on bricks or
cinder blocks to prevent clogging.
5. If the sump is too small to allow both pumps to sit on the
bottom of the sump, find a raised position that doesn't
interfere with the primary sump pump switch.
6. Cut a piece of 1-1/2" PVC pipe to reach from the backup
pump discharge elbow to about one (1) foot above the
basement floor. This is the lower discharge pipe.
7. To prevent airlocking the pump during operation, drill a
1/8" hole in the lower discharge pipe about 2" above the
bottom of the pipe (below floor level).
8. Install FP0026-10 check valve (purchase separately)
on the upper end of the pipe. Tighten the hose clamps
securely. BE SURE that the flow arrows point UP (away
from the backup pump). If they point down, the valve will
not pass water and the pump will not work.
9. Cut the discharge pipe for the primary sump pump above
the union and check valve (if any). Make this cut about
18" above the top of the BBU's riser pipe with the backup
pump sitting as installed.
10. If the primary sump pump does not have a check valve
installed in the discharge pipe, install one now.
11. Cut a length of discharge pipe for the primary sump pump
to fit between the check valve and a 45° slip wye. Be sure
to allow for the overlap needed for gluing joints.
12. Install the 45° wye on the primary sump pump's discharge
pipe.
8
13. Install a 45° elbow on the 1-1/2" BATTERY BACKUP
discharge pipe.
14. Fit the upper discharge pipe to the upper end of the wye.
NOTICE: It is good practice to cut a short length of pipe to
go into the wye and install a union on the pipe. Continue
the discharge pipe from the outlet side of the union.
This will allow easier removal of the system for cleaning
or service. A U74-68 Hose and Clamp Assembly (sold
separately) can be used for this.
15. Make sure that the BBU will clear the primary sump pump
and its switch. If there isn't room for both pumps to sit
on the floor of the sump, the BBU will have to be raised
(depending on your particular situation).
16. Do a trial assembly to make sure that everything is
going to fit. This may require a helper to assist in holding
everything together while you check the fit without glue.
Mark all joints before gluing.
Follow the glue manufacturer's instructions regarding fire
hazards and ventilation when using PVC solvents, primer,
and cement.
inhalation.
17. Take all the pipe apart, clean all joints, and then
reassemble the system, gluing it with PVC primer and
glue.
18. Install the Battery Backup Switch as shown, 1" above start
water level of primary pump. Fasten it to the pipe with the
cable ties provided.
19. Tape the pump cord to the riser pipe so that the plug
cannot fall into the sump.
20. Go to BBU WIRING AND SETUP section of this manual for
wiring instructions.
21. Once all wiring is complete, fill your pit with water and
verify that the primary sump pump removes the water and
the BBU doesn't run.
22. Then, unplug your primary sump pump and refill your pit
with water. Verify that the BBU pump removes the water.
23. Make sure that the power is on to both pumps, and your
system is ready to use.
Risk of fire and chemical
MY979 (06-08-20)