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© Copyright 2020 Zoeller
®
Co. All rights reserved.
Indoor Prepackaged System Installation Instructions
This set of instructions is for factory prepackaged indoor systems only. If your system is a field assembled
indoor system, use these instructions as a guideline. If your system is an outdoor system then go to the next section in this manual
that covers outdoor systems.
1. Indoor grinder pump systems are for installing at grade in an
indoor application only. If you will be installing this system
outside next to the residence then you will need an outdoor
system. DO NOT INSTALL THE INDOOR SYSTEM OUTDOORS.
2. Review the drawing in Fig. 2 on page 6 and the actual system
to become familiar with the components in the grinder pump
system. Review where the unit will be installed. Determine
where the power feed, inlet pipe, discharge pipe and vent
will be located.
3. Remove the unit from the packing. Indoor prepackaged sys-
tems are preassembled at the Zoeller Company and require
a minimum of field assembly work. All work inside the basin
can be performed via the inspection port. There should be
no reason to remove the cover from the basin. Pump and
float switches are already set inside the basin.
4. Remove the inspection plate from the cover. All floats are
set and tethered for proper operation from the factory. Verify
that where the float switches are set will work for your ap-
plication. Verifying that the float switches are set properly
and will not hang up inside the basin is the responsibility of
the installing contractor. Float switches are tied in place
for shipping purposes. Cut the cable tie around each float
switch bulb or the unit will not operate properly.
5. Dig a hole for the basin. The basin should be located in a
very low traffic area within 15’ of the power disconnect.
The hole should be at least 8” larger in diameter than the
basin in order to leave 4” of backfill all the way around
the perimeter. A minimum of 4” of compacted subbase
is also required. Backfill and subbase should be 1/8” to
3/4” pea gravel or 1/8” to 1/2” crushed stone. Also reference
the basin installation instructions included with the unit.
6. The 4” inlet hub should be located between the top lip of
the basin and the alarm float “on” level with a minimum
distance of 10 inches between the floor of the basin and hub.
Determine the location of the inlet hub based upon your inlet
pipe arrangement. The inlet hub must be used with 4” pipe.
It is best to install the inlet on the side of the basin opposite
the float switches. To install, use a 4” hole saw to drill into
the side of the basin at the correct elevation. Center the
hub inner diameter with the hole in the basin. Attach the
hub to the side of the basin using the sealant and hardware
provided.
7. Set the basin in the hole and connect the 4” inlet pipe to the
inlet hub using the rubber insert. If using a cast iron hub,
the 4” inlet pipe will need to be caulked or gasketed to the
hub. Backfill around the basin with specified media. Care
should be taken not to damage components or leave voids
when backfilling. Finish grade of floor should be poured in
place around the top 6” of the basin assembly.
8. Connect the discharge pipe, valves and vent according to
all applicable National, State and Local plumbing codes.
9. Mount the alarm panel on the wall above the system. Connect
the alarm float switch and pump power cord.
10. Clean any debris out of the basin. Fill the basin with water
and check the system for proper operation.
11. Record system start-up data for future reference.
12. Seal and secure the inspection plate to the lid using the proper
bolts and sealant. Pouring concrete around the system can
now be completed.
