Schier GB-1000-L User manual

Contents
Special Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Series Installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
INSTALLATION GUIDE
GB-1000-L 100 GPM Great Basin™Indoor/Outdoor Grease Interceptor
913-951-3300 | schierproducts.com
© Copyright 2021 Schier Products Company, 10/22/2021
Part #: 4080-202-01
Find these instructions online at: schierproducts.com/technical-resources
LEGACY

DO NOT INSTALL
ABOVE GRADE
Installation Instructions
Installation instructions and additional
components are included with the
interceptor. Read all instructions prior to
installation. This interceptor is intended
to be installed by a licensed plumber in
conformance with all local codes.
High Water Table Installations
Interceptors and risers are not designed
to withstand water table height in excess
of the top of the unit when buried (see
figure). If it is possible for this to occur,
install the interceptor and risers in a
water-tight concrete vault or backfill with
concrete or flowable fill (wet concrete
and flowable backfill should be poured
in stages to avoid crushing the
interceptor). At risk areas include but are
not limited to tidal surge areas,
floodplains and areas that receive storm
water. Great Basin™models that are direct buried in high water table
scenarios must be installed with an anchor kit. Model GB-1000 uses
model AK3 anchor kit for use with deadmen anchors.
max water table height
for direct burial
deadman anchor
polyester strap
turnbuckle
Below Grade Installation Slab Requirements
A concrete slab to finished grade with rebar is required when
installing interceptor below grade.
Pedestrian Traffic or
Greenspace Areas Vehicular Traffic Areas
4" min. slab 8" min. slabRebarRebar
ODOR ALERT!
Interceptor is not a
sewer gas trap.
All upstream fixtures
must be trapped
concrete slab subject to hydrostatic pressure
watertight
concrete
vault
Hydrostatic/
Pressure Slabs
When installed under a
hydrostatic slab (slab
designed to withstand
upward lift, usually caused
by hydrostatic pressure)
interceptor must be
enclosed in a watertight
concrete vault.
SPECIAL PRECAUTIONS
Do not install this unit in any manner
except as described in these instructions.
Doing so may result in property damage, personal injury or death.
DO NOT AIR TEST UNIT OR RISER SYSTEM!
For Schier Grease Interceptor Installations - Failure to follow this guidance
voids your warranty
Schier | GB-1000-L Installation Guide
page 2 of 9

SPECIAL PRECAUTIONS
For Schier Grease Interceptor Installations - Failure to follow this guidance
voids your warranty
DO NOT
COMPACT BACKFILL
MECHANICALLY
Compact by
hand only
Indirect
Connections
If your dishwashing
sink(s) discharges into a
floor drain/sink (drain),
you must regulate the
flow into the drain to
avoid an overflow of
water onto the kitchen
floor. This can be done by
installing a valve or flow restriction cap on the sink piping that
discharges into the drain. See drawing for guidance.
For detailed guidance on indirect connections, go to:
webtools.schierproducts.com/Technical_Data/Indirect_Connections.pdf
Fernco or similar
rubber flow
restriction end cap
High Temperature Kitchen Water
cold water supply line
high temperature
effluent ( > 150º F)
approved backflow
prevention assembly
DTV (drain water
tempering valve)
If water is entering the interceptor at excessive temperature (over
150º F), a drain water tempering valve (DTV) and approved backflow
prevention assembly must be installed. Most state and local
plumbing codes prohibit water above 150º F being discharged into
the sanitary sewer. Water above 150º F will weaken or deform PVC
Schedule 40 pipe, poly drainage fixtures like interceptors and erode
the coating of cast iron (leading to eventual failure).
indirectly connecteddirectly connected
Corrugated Riser Pipe
Requirements
Riser adapter model CA2 must
be used when installing
interceptors using 24" diameter
corrugated pipe as a riser. This
will adequately embed the
cover adapter in the concrete
slab, preventing cover/cover
adapture failure under traffic
rated loads.
Installations with Risers
Max Water Level
Risers are not designed
to retain water
3 FCR2 Risers Max
94"
94"
6 - 94"
6 - 94"
CA2
page 3 of 9
Schier | GB-1000-L Installation Guide

1a 1b
1c
Have a Leak?
Call customer care at 913-951-3300
Hours 8am-5pm CST, M-F
1Test Tank for Water Tightness
Cap both connection points with 6" flexible PVC caps. Remove covers. For base unit testing fill with water to
just above the highest connection.
Inspect unit, connections and gaskets for leaks. Check
water level at specific time intervals per local code.
Fill Line
Excavate hole at least 18" larger than interceptor on all sides and 12" deeper than tank bottom. Lay a level bed of
well-packed, crushed aggregate (approximately 3/4" size rock or sand, with no fines) in the base of hole.
12" or more
2 Excavate Burial Pit
18" 18"
12"
Schier | GB-1000-L Installation Guide
page 4 of 9

This unit is supplied with additional components for
use in high flow/ increased head pressure conditions.
•If dimension "A" is 13 feet or less, no additional
components are needed, go to Step 4,
Connect Piping.
• If dimension "A" is more than 13 feet, or a high
flow/increased head pressure condition exists,
follow Steps below.
3 Install Inlet Diffuser Components
3b Install chosen component
3a Choose appropriate inlet diffuser component based on diffuser size
Remove Safety Star® insert and remove flow control cartridge from
the parts bag. Slide component into top of inlet diffuser and rotate
clockwise until cartridge drops onto the retainer pins. Continue
rotating clockwise until pins are fully seated.
retainer
pin
receiver
slot
4" Diffusers
6" Diffusers
Before
connecting
piping and burial,
fasten flow
control plate to
inlet bulkhead fitting
using supplied screws. Holes in
plate must line up with pre-drilled holes in
bulkhead fitting and grooved side of plate
must face the unit.
Flow Control
Plate
Inlet
Bulkhead Fitting
This unit is certified to ASME A112.14.3 (Type C) and CSA B481.1
and requires internal flow control. External flow control with
vent not required.
Install flow control
cartridge (red) or plate
4" diffuser 6" diffuser
For easy inlet diffuser
cover or flow control
cartridge removal in
deep burial
installations, 1-1/2" PVC
SCH. 40 pipe may used
as an extension handle.
Before risers have been
installed, cut pipe to length
and attach to top of cover using PVC
primer/cement. Extension handle length
should be about 12" shorter than total
riser height.
3c OPTIONAL for 4" Diffusers: install extension handle
Finished
installation
showing
optional
extension
handle
page 5 of 9
Schier | GB-1000-L Installation Guide

4a Install plain end fittings (4" CONNECTIONS ONLY)
4b Connect interceptor to drain lines
4 Connect Piping
Screw plain end fittings (included) into bulkhead fittings using pipe thread sealant or tape
approved for use with plastics. 6" connection types come pre-installed from the factory.
Place unit into final position and set level. Mechanically couple inlet and outlet drainage lines to
unit. Do not solvent weld. Ensure all upstream fixtures are trapped. Vent per local code. Installation
of 2-way cleanout tees to grade (by others) is recommended for buried installations.
Outlet
2-Way cleanout tee
Inlet COUPLING DETAIL
Coupling
Drain line
Bulkhead fitting
5 Wet or Air Test Piping Per Local Code
Doing so may result in property damage, personal injury or death.
DO NOT AIR TEST UNIT OR RISER SYSTEM! Have a Leak?
Call customer
care at 913-951-3300
Hours 8am-5pm CST, M-F
Schier | GB-1000-L Installation Guide
page 6 of 9
4" Plain End
4" FPT
4" FPT

6 Bring Covers Flush-to-Grade
The GB-1000 is ready for burial depth of 77" from finished grade to bottom of tank (or 18" to centerline of inlet).
Deeper burials will require extending the cover adapters and possibly adding risers.
Measure dimension X to determine riser height needed.
6a
See instructions included with FCR2.
Riser Height Risers
Needed Required
0" - 4" None (use adapter)
>4" - 34" FCR2 (x2)
>34" - 64" FCR2 (x4)
>64" - 94" FCR2 (x6)
Loosen the cover adapter upper band
clamp using 7/16" nut driver bit. Adjust
cover adapter heights as needed.
Maintain a minimum 2-1/2" insertion
depth. Tighten upper band clamp to 5
-8 ft. lbs. of torque using 7/16" nut driver
bit. If required, cover adapters may now
be tilted up to 10º in any direction using
gasket flexibility.
6c Make final cover adapter adjustments
6b Install risers if required
COVER ADAPTER ADJUSTMENT DETAIL
2-1
/
2" minimum
Cover
Safety Star
access restrictor
Cover adapter
Gasket
Upper band clamp
Lower band clamp
Interceptor accessway
page 7 of 9
Schier | GB-1000-L Installation Guide

45º
DO NOT COMPACT BACKFILL
MECHANICALLY
Compact by hand only
7 Install Anti-Flotation Anchor Kit
8 Backfill and Finished Grade
Fill unit with water for stabilization and float-out prevention. Backfill evenly around tank using crushed aggregate
(approximately 3/4" size rock or sand with no fines)or flowable fill. Do not mechanically compact backfill around unit.
8a Backfill
Vehicular Traffic Areas:
Minimum 8" thick concrete slab with rebar required. Thickness of concrete around covers to be
determined by specifying engineer. If traffic loading is required the concrete slab dimensions
shown are for guideline purposes only. Concrete to be 28 day compressive strength to 4,000 PSI.
Use No. 4 rebar (ø 1/2") grade 60 steel per ASTM A615: connected with tie wire. Rebar to be 2-1/2"
from edge of concrete and spaced in a 12" grid with 4" spacing around access openings.
Pedestrian Traffic or Greenspace Areas:
Minimum 4" thick concrete slab with rebar required.
8b Pour concrete slab to finished grade
Rebar
TOP VIEW 18"
min 18" min
18"
min
18"
min
Concrete Slab
Rebar
If the installation location is in a
high water table or at risk area
(including but not limited to tidal
surge areas, floodplains and
areas that receive storm water)
the GB-1000 must be installed
with Schier model AK3 anchor kit
(with deadman anchors
by others).
AK3 INSTALLATION
Deadmen
anchors
(by others)
Schier | GB-1000-L Installation Guide
page 8 of 9

SERIES INSTALLATIONS
For lower flow rates and higher grease storage requirements. Piping between units and two-way
cleanout tees by others.
All units must be level in the excavation pit. Note that downstream units must be buried 2" deeper
than the adjacent, upstream fixture. Two-way cleanout tees extended to finished grade should
be installed before the first unit inlet, after the last unit outlet and in between units (if there is a
long run of pipe between units) for line cleaning purposes.
NOTE: When the flow control is required, it should only be installed on the first unit in the series.
Side View of 3 GB-1000 Units Piped in Series
2"
Top View of 4 GB-1000 Units Piped in Series
Two-way cleanout tee extended to
grade (provided by others)
Rated Grease Capacities for Units Piped in Series
2
3
4
No. of Units
In Series
Removal Efficiency
100 GPM - 98.8%
13,094 lbs.
19,641 lbs.
26,188 lbs.
100 GPM - 99%*
12,474 lbs.
18,711 lbs.
24,948 lbs.
* Satisfies Miami DERM 99% efficiency requirements
Units piped in series are certified to ASME A112.14.3
(Type C) and CSA B481.1. and include an internal flow
control. External flow control with vent not required.
page 9 of 9
Schier | GB-1000-L Installation Guide