Schier GB-500 User manual

Contents
Special Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Getting to Know the GB-500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Buried Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
On the Floor Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-13
Installation Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Part #: 4075-001-01
Find these instructions online at: schierproducts.com/gb-500
INSTALLATION GUIDE
GB-500 100 GPM Grease Interceptor for Indoor / Outdoor Use
© Copyright 2020 Schier, 04/09/2020

When Installing Interceptor Inside
SPECIAL PRECAUTIONS
Installation Instructions
Hydrostatic Slabs (or Pressure Slabs)
High Temperature Kitchen Water
concrete slab subject to hydrostatic pressure
watertight
concrete
vault
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
cold water supply line
high temperature
effluent ( > 150º F)
approved backflow
prevention assembly
DTV (drain water
tempering valve)
directly connected indirectly connected
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).
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.
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
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.
Interceptor
Interceptor
Interceptor
Interceptor
Interceptor
Interceptor
Interceptor
Interceptor
Interceptor
Fernco or
similar rubber
flow restriction
end cap
Interceptor
Interceptor
Interceptor
A concrete slab to finished grade with rebar is required when
installing interceptor below grade.
Below Grade Installation Slab Requirements
Interceptor
Interceptor
Interceptor
Pedestrian Traffic or
Greenspace Areas
Interceptor
Interceptor
Interceptor
Vehicular Traffic Areas
Rebar
4" min. slab 8" min. slab
Rebar
page 2 of 14
GB-500 Installation Guide

SPECIAL PRECAUTIONS
AGS2
The wet weight of the interceptor combined
with high temperature kitchen water
creates the potential for tank deformation
when installed above grade. Model GB-500
installed above grade must be installed
with Above Grade Support Kit model AGS2
to maintain structural integrity
Above Grade Installation Support
(for Model GB-500 Only)
Install unit on solid, level surface in
contact with the entire footprint of
unit base; for suspended
installations design trapeze to
support the wet weight of the unit.
Do not partially support unit or
suspend unit using metal
U-channel to create a trapeze.
Fully Support Base of Unit
For above grade installations ensure
heavy inlet and outlet piping (such as
cast iron or long runs) is properly
supported or suspended during the
entire installation process to prevent
connection failure or damage to
bulkhead fittings.
Support Inlet and Outlet Piping
concrete floor
suspended installation
Interceptor
Interceptor
Interceptor
DO NOT
COMPACT
BACKFILL
For Schier Grease Interceptor Installations - Failure to follow this guidance
voids your warranty
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-500 uses model AK1 anchor kit.
max water table height
for direct burial
model AK1
anchor kit
Interceptor
Interceptor
Interceptor
Interceptor
Interceptor
Interceptor
pipe supports
Interceptor
Interceptor
Interceptor
page 3 of 14
GB-500 Installation Guide

GETTING TO KNOW THE GB-500
1. Pickable Cast Iron Cover (standard)
2. Cover Gasket
3. Safety Star (x2)
4. Safety Star Tether (x2)
5. Cover Adapter (x2)
6. Cover Adapter Gasket
Assembly(x2) with Upper and
Lower Stainless Steel Band Clamps
7. Bulkhead Connection Retaining Nut
8. Bulkhead Connection Gasket
10. 4" Cleanout Plug (x2)
11. Flow Control Cartridge
(>13' below kitchen only)
12. Inlet Diffuser
13. Inlet Diffuser Retaining Nut
14. Inlet Diffuser Foot Retaining Nut
15. Inlet Diffuser (Foot)
16. Inlet Bulkhead Connection
(standard) 4" FPT
17. 4" Plain End Fitting (x2)
18. 3" Plain End Fitting (x2) (optional)
19. Composite Cover Bolts
and Washers (x8)
20. Bolted Composite Cover (optional)
21. Air Relief/Visual Access
22. Outlet Diffuser Retaining Nut
23. Outlet Diffuser
24. Outlet Bulkhead Connection
(optional) 4" FPT (x2)
25. Outlet Bulkhead Connection
(standard) 4" FPT
26. 7/16" Nut Driver Bit
1 19
20
2
3
21
22
23
4
5
10
6
7
8
24
17
25
8
7
7
8
24
10
2
3
5
6
11
12
13
14
15
7
8
16
17
18
26
4
18
page 4 of 14
GB-500 Installation Guide

Special Precautions
BURIED INSTALLATION
1a 1b
1c
Leak?
Call customer care at 913-951-3300
8a – 5p M – F CST
1Test tank for water tightness
Fill Line
Cap all connection points with 4" cleanout
plugs using pipe thread sealant or tape
approved for use with plastics.
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.
Max Water Level
Risers are not designed
to retain water
5
3 Risers (94") Max
4
Interceptor
Interceptor
Interceptor
Install interceptor as
close as possible to
fixtures being served
1 3
Provide at least 16"
clearance above unit for
routine maintenance.
2
16" min.
ODOR ALERT!
Interceptor is not a
sewer gas trap.
All upstream fixtures
must be trapped
Interceptor
Interceptor
Interceptor
page 5 of 14
GB-500 Installation Guide

BURIED INSTALLATION
2e
Cap all unused connection points
with 4" cleanout plugs using pipe
thread sealant or tape approved
for use with plastics.
2 Set Up Outlet Diffuser and Install Cleanout Plugs
2a Choose outlet location.
Side outlet
2b 2c 2d
Remove safety star insert,
leave tethered to unit.
Unscrew diffuser
retaining nut and
remove outlet diffuser.
Rotate diffuser toward
chosen outlet, insert and
hand tighten retaining nut.
Straight-through
page 6 of 14
GB-500 Installation Guide

BURIED INSTALLATION
Flow control is not pre-installed on this unit.
• If dimension "A" is 13 feet or less no flow control is
needed, go to Step 5, Excavate Burial Pit.
• If dimension "A" in Figure 1 is more than 13 feet, or
a high flow/increased head pressure condition
exists, follow Steps below.
Note to Plumbing Inspector
This interceptor includes certified internal flow control and
does not require a dedicated “Flow Control Vent” (air intake).
3 Install Flow Control
Figure 1
Interceptor
Interceptor
Interceptor
UNITS WITH 4" DIFFUSERS
3a
5
OPTIONAL: For easy
flow control 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 flow
control cartridge using
PVC primer/cement.
32 4
Slide flow control cartridge into top of inlet diffuser and rotate
clockwise until cartridge drops onto flow control retainer pins.
Continue rotating clockwise until pins are fully seated.
200 GPM Installation
Only: Cut off bottom of
flow control cartridge
at marked line.
flow control
retainer pin
cartridge
receiver slot
1
Remove safety star
insert and remove flow
control cartridge from
the parts bag
Install flow control plate
on the inlet bulkhead
fitting prior to connecting
piping and burial. Fasten
plate to 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.
UNITS WITH 6" DIFFUSERS
3b
Flow
Control
Plate
Inlet
Bulkhead
Fitting
page 7 of 14
GB-500 Installation Guide

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.
4a 4b
12" or more
18" 18"
12"
4 Excavate Burial Pit
BURIED INSTALLATION
6 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!
1Leak? Call customer care at
913-951-3300
8a – 5p M – F CST
Lower unit into pit 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.
5b
5 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.
5a
4" Plain End
4" FPT
Outlet
Connection
2-Way
Cleanout Tee
Inlet
Connection
page 8 of 14
GB-500 Installation Guide

BURIED INSTALLATION
7 Bring Covers Flush-to-Grade
The GB-500 is ready for burial depth of 49-1/2" from finished grade to bottom of tank (or 10-1/2" to centerline of inlet).
Deeper burials will require extending the Cover Adapters and possibly adding risers.
Measure dimension X to determine riser height needed.
7a
Install risers if required
(see instructions included with FCR2).
7b
Riser Height Risers
Needed Required
0" - 4" None (use adapter)
>4" - 34" FCR2 (x2)
>34" - 64" FCR2 (x4)
>64" - 94" FCR2 (x6)
If required, Cover Adapters
may now be tilted up to
10º in any direction using
gasket flexibility.
7f
Adjust Cover Adapter
heights as needed.
Maintain a minimum
2-1/2" insertion depth.
2-1
/
2" minimum
7d
Loosen the
Cover Adapter Upper
Band Clamp using 7/16"
Nut Driver Bit.
7c
Tighten Upper
Band Clamp to 5 -8 ft.
lbs. of torque using 7/16"
Nut Driver Bit.
7e
8 Backfill and Finished Grade
Fill unit with water for stabilization
and float-out prevention.
8a 8a
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.
Backfill evenly around tank using crushed
aggregate (approximately 3/4" size rock
or sand with no fines)or flowable fill. Do
not compact backfill around unit.
TOP VIEW 18"
min
45º
18"
min
18"
min
18"
min
Concrete Slab
Rebar
Pour concrete slab to finished grade.
8c
8c1
Rebar
page 9 of 14
GB-500 Installation Guide

Special Precautions
ODOR ALERT!
Do not install air
gap on outlet side
of interceptor.
1Install interceptor as close as
possible to fixtures being served
3
Provide at least 16"
clearance above unit for
routine maintenance.
16" min.
4
ON THE FLOOR INSTALLATION
ODOR ALERT!
Interceptor is not a sewer gas trap.
All upstream fixtures must be trapped
2
1a 1b
1c
Leak?
Call customer care at 913-951-3300
8a – 5p M – F CST
1Test tank for water tightness
Fill Line
Cap all connection points with 4" cleanout
plugs using pipe thread sealant or tape
approved for use with plastics.
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.
page 10 of 14
GB-500 Installation Guide

ON THE FLOOR INSTALLATION
2e
Cap all unused connection points
with 4" cleanout plugs using pipe
thread sealant or tape approved
for use with plastics.
2 Set Up Outlet Diffuser and Install Cleanout Plugs
2a Choose outlet location.
Side outlet
2b 2c 2d
Remove safety star insert,
leave tethered to unit.
Unscrew diffuser
retaining nut and
remove outlet diffuser.
Rotate diffuser toward
chosen outlet, insert and
hand tighten retaining nut.
Straight-through
page 11 of 14
GB-500 Installation Guide

ON THE FLOOR INSTALLATION
Flow control is not pre-installed on this unit.
• If dimension "A" is 13 feet or less no flow control is
needed, go to Step 5, Connect Piping.
• If dimension "A" in Figure 1 is greater than 13 feet,
or a high flow/increased head pressure condi-
tion exists, follow Steps below.
Note to Plumbing Inspector
This interceptor includes certified internal flow control and
does not require a dedicated “Flow Control Vent” (air intake).
3 Install Flow Control
Figure 1
Interceptor
Interceptor
Interceptor
UNITS WITH 4" DIFFUSERS
3a
32 4
Slide flow control cartridge into top of inlet diffuser and rotate
clockwise until cartridge drops onto flow control retainer pins.
Continue rotating clockwise until pins are fully seated.
200 GPM Installation
Only: Cut off bottom of
flow control cartridge
at marked line.
flow control
retainer pin
cartridge
receiver slot
1
Remove safety star
insert and remove flow
control cartridge from
the parts bag
Install flow control plate
on the inlet bulkhead
fitting prior to connecting
piping and burial. Fasten
plate to 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.
UNITS WITH 6" DIFFUSERS
3b
Flow
Control
Plate
Inlet
Bulkhead
Fitting
page 12 of 14
GB-500 Installation Guide

Floor Below Installation Detail
5 Install AGS2 Above Grade Support Kit (sold separately)
ON THE FLOOR INSTALLATION
Mechanically couple inlet and outlet drainage lines
to unit. Do not solvent weld. Ensure all upstream
fixtures are trapped. Vent per local code.
6 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!
1Leak? Call customer care at
913-951-3300
8a – 5p M – F CST
The wet weight of the interceptor combined
with high temperature kitchen water
creates the potential for tank deformation
when installed above grade. Model GB-500
installed above grade must be installed
with Above Grade Support Kit model AGS2
to maintain structural integrity. Refer to
installation instructions included with AGS2.
Above Grade Support Kit - AGS2
4 Connect Piping
4b
Interceptor
Interceptor
Interceptor
vent per
local code
flexible PVC
couplings
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.
4a
4" Plain End
4" FPT
page 13 of 14
GB-500 Installation Guide

deadmen anchors (by others)
INSTALLATION OPTIONS
1 High Water Table Installations, See Anchor Kit Model AK2
2 Series Installations
For lower flow rates and higher
grease storage requirements.
Piping between units and
two-way cleanout tees by others.
Below grade installations: 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
cartridge is required, it should
only be installed on the first unit
in the series.
Top View of 4 GB-500 Units Piped in Series
Side View of 3 GB-500 Units Piped in Series
Rated Grease Capacities
for Units Piped in Series
No. of Removal Efficiency
Units 100 GPM
in Series 95.3%
2 6,096 lbs.
3 9,144 lbs.
4 12,192 lbs.
Two-way cleanout tee extended to
grade (provided by others)
2"
Deadmen Anchoring:
If the installation location is in a high
water table area or at risk are (including
but not limited to tidal surge areas,
floodplains and areas that receive storm
water) the GB-500 must be secured to
concrete deadmen anchors (by others)
using Schier model AK2 anchor kit.
page 14 of 14
GB-500 Installation Guide