Pentair Myers MBSP-2 Owner's Manual page 5

Installation
INSTALLATION (Typical): Separate Discharge
Risk of electrical shock. Can shock, burn, or
kill. Unplug the primary sump pump before beginning this
procedure.
NOTICE: Allow for overlap when cutting piping and run a
trial (dry) fitting before you glue.
1. 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.
2. If possible, install the Battery Backup Unit (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.
NOTICE: 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.
3. If the sump is too small to allow both pumps to sit on
the bottom of the sump, install an angle bracket on the
primary sump pump's discharge pipe with stainless steel
hose clamps. Mount the backup pump on the angle
bracket. See Figure 1, "Separate Discharge".
4. Cut a piece of 1-1/2" PVC pipe to reach from the back-
up pump discharge elbow to about one (1) foot above
the basement floor. This is the lower discharge pipe.
5. 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).
6. 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 BBU). If they point down, the valve will not
pass water and the pump will not work.
7. Cut a short length of 1-1/2" PVC pipe for a riser pipe
and clamp it into the top of the check valve.
8. Install a U74-68 Hose and Clamp Assembly on the top
of the riser pipe. For 1-1/2" pipe, remove and discard
the short piece of 1-1/4" hose in the Hose and Clamp
Assembly. Leave the hose clamps loose and slide the
Assembly down below the top of the riser pipe.
9. Determine where you want the discharge to exit the
basement. At that point, drill the necessary holes (large
enough to have clearance for a 1-1/2" pipe) to allow
you to run the discharge pipe from above the sump to
the outdoors.
10. Install the horizontal discharge pipe. Install a 90° elbow
on the inside end but do not glue.
11. Cut another short piece of 1-1/2" PVC for the Upper
Discharge Pipe to run from the top of the riser pipe up
to the 90° elbow. Be sure to allow enough overlap for
the glue joint in the elbow.
12. Do a trial fit with NO GLUE, installing the 1-1/2"
upper discharge pipe in the 90° elbow and the upper
discharge pipe in the vertical end of the 90° elbow. The
upper discharge pipe should just fit between the riser
pipe and the elbow.
13. Risk of fire and chemical inhalation.
Whenever using PVC primer and PVC cement, follow
the glue manufacturer's instructions.
14. 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).
15. Clean, prime and glue the upper discharge pipe into the
90º elbow. When the glue has set, slide the Hose and
Clamp Assembly up to cover the joint and tighten all the
hose clamps.
16. Install the Battery Backup Switch as shown, 1" above
start water level of primary pump. Fasten it to the pipe
with cable ties.
17. Tape the pump cord to the riser pipe so that the plug
cannot fall into the sump.
18. Go to "BBU WIRING AND SETUP" (Page 8) for wiring
instructions.
19. Once all wiring is complete, fill your pit with water
and verify that the PSP removes the water and the BBU
doesn't run. Then, unplug your PSP and refill your pit
with water. Verify that the BBU pump removes the water.
20. Make sure that the power is on to both pumps, and your
system is ready to use.
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