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© Copyright 2021 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. 5 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 systems
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 application. 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. Most systems are
supplied with a field installed 4" pipe seal inlet fitting. This inlet
fitting is installed in the basin's side-wall in a 5" hole drilled with a
hole saw at a location lining up with the inlet pipe.
7. Set the basin in the hole and connect the 4" inlet pipe to the inlet
hub using the rubber insert. 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 control panel on the wall within 15’ of the system.
Connect the float switch and pump cords.
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.
