Schier GB2 User manual

INSTALLATION GUIDE
Model #GB2 35/50 GPM Grease Interceptor
For Indoor Use
Contents
Special Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Geing to Know the GB2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
On the Floor Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6
Buried Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
Part #: 057-1260-02
Find these instructions online at: schierproducts.com/pages/gb2

SPECIAL PRECAUTIONS
For All Schier Great Basin™ Grease Interceptor Installations
Installation Instructions
Installation instructions and additional components are located
inside 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 Temperature Kitchen Water
If water is entering the interceptor at excessive temperature
(over 140º F), a drain water tempering valve (DTV) must be
installed. Most state and local plumbing codes prohibit water
above 140º F being discharged into the sanitary sewer. Water
above 140º 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). Failure to follow this guidance
voids your warranty.
high temperature
effluent ( > 140º F)
drain water
tempering valve (DTV)
cold water supply line Interceptor
Interceptor
Interceptor
Hydrostatic Slabs (or Pressure Slabs)
concrete slab
subject to
hydrostatic pressure
watertight
concrete vault
Interceptor
Interceptor
Interceptor
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.
Failure to follow this guidance voids your warranty.
When Installing Interceptor Inside
Fernco or similar
rubber flow
restriction end cap
Interceptor
Interceptor
Interceptor
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 below for guidance.
For detailed guidance on indirect connections, go to:
hp://webtools.schierproducts.com/Technical_Data/Indirect_Connections.pdf
Page 2 of 9
GB2 Installation Guide
max water
table height for
direct burial
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. Failure to follow this guidance voids your warranty.
Models GB-50, GB-75, and GB-250 that are direct buried in high
water table scenarios must be installed with model AK1 anchor kit
or warranty is void.
Interceptor
Interceptor
Interceptor
model AK1
anchor kit

GETTING TO KNOW THE GB2
1. Cover
2. Air Relief/Visual Access
3. Inlet Diffuser (Top)
4. Optional Side Outlet 4" FPT
5. Connection Fiing Gasket
6. Bulkhead Retaining Nut
7. 4" Cleanout Plug
8. Standard Installation Flow Control Plate (Red)
9. Flow Control Plate (>5' below kitchen only)
10. 4" x 3" FPT Fiing
11. Inlet 4" FPT Connection
12. Saddle Adapter Retaining Nut
13. Saddle Adapter
14. Inlet Diffuser (Foot)
15. Cover Bolts (x4)
16. Cover Gasket
17. Outlet 4" FPT Connection
18. Outlet Diffuser (Top)
19. Outlet Diffuser (Foot)
Page 3 of 9
GB2 Installation Guide
2
3
6
5
7
4
9
8
1
11
5
10
17
5
10
15
16
7
6
12
13
14
6
5
13
18
12
6
19
4

ODOR ALERT!
Do not install air
gap on outlet side
of interceptor.
ODOR ALERT!
Interceptor is not a sewer gas trap.
All upstream fixtures must be trapped
ON THE FLOOR INSTALLATION
Special Precautions
Read all instructions
before installation
Install in conformance
with all local codes
Install interceptor as close as
possible to fixtures being served
DO NOT AIR TEST UNIT OR RISER SYSTEM!
Doing so may result in property damage,
personal injury or death.
1 2 3
4
5
Provide at least 5-1/2" clearance
above unit for routine maintenance.
5-1/2" min.
5-1/2" min.
5-1/2" min.
6
Page 4 of 9
GB2 Installation Guide
Cap all connection points with 4" cleanout
plugs using pipe thread sealant or tape
approved for use with plastics.
Remove cover and fill unit completely
with water. Inspect for leaks.
1a 1b Leak? Call customer
care at 913-951-3300
8a – 5p M – F CST
1 Test tank for water tightness
2 Configure outlet diffuser and install cleanout plugs
2h
Remove diffuser
from saddle.
Side outlet
Straight-through
Remove
saddle adapter.
Remove
diffuser foot.
2b 2c 2d2a
Install saddle adapter
on desired outlet.
2e
Install
cleanout
plugs into
unused outlet
connections using
pipe thread sealant or tape
approved for use with plastics.
2f
Seat diffuser firmly
into saddle.
2g
Choose outlet
location.
Rotate diffuser
top toward
desired outlet,
while ensuring
foot is pointed
toward the
back wall of the
unit. Reaach
to foot.

ON THE FLOOR INSTALLATION
• If dimension "A" above is 5 feet or less go to Step 4, Connect Piping.
• If dimension "A" above is greater than 5 feet follow Steps below.
Figure 1
Remove inlet diffuser. Remove red flow control plate from
inlet diffuser and discard.
Remove inlet saddle adapter.
3a 3b 3c
Depending on which flow rate is
desired, snap-in the "35 GPM" or
"50 GPM" white flow control plate
as shown on inlet saddle adapter.
Re-install saddle adapter, ensure
flow control plate opening is down
as shown.
Seat inlet diffuser firmly into
saddle adapter.
3e 3f3d
Note to Plumbing Inspector
This interceptor includes certified internal
flow control and does not require a
dedicated “Flow Control Vent” (air intake).
Interceptor
Interceptor
Interceptor
OR
OR
OR
Page 5 of 9
3 Calibrate Flow Control
GB2 Installation Guide

ON THE FLOOR INSTALLATION
Choose inlet and outlet fiings (included)
based on pipe size.
4a
4b
3" FPT
4" FPT
4" FPT
4" FPT
Connect piping using pipe thread sealant or tape approved
for use with plastics. Ensure all upstream fixtures are
trapped. Vent per local code.
OR
OR
OR
OR
OR
OR
4b2
4b3
Page 6 of 9
4 Connect Piping
GB2 Installation Guide
vent per
local code
Next to Sink
5-1/2" min.
vent per local code
Under Sink
vent per
local code
Floor Below
4b1
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!
1
Leak? Call customer care at
913-951-3300
8a – 5p M – F CST

BURIED INSTALLATION
Special Precautions
DO NOT AIR TEST UNIT
OR RISER SYSTEM!
Doing so may result in
property damage,
personal injury or death.
Read all
instructions
before installation
Install in
conformance
with all local codes
Install
interceptor
as close as
possible to
fixtures
being served
2 Risers (25") Max Max Water Level
Risers are not designed
to retain water
1 2 3 4 5
Page 7 of 9
GB2 Installation Guide
Cap all connection points with 4" cleanout
plugs using pipe thread sealant or tape
approved for use with plastics.
Remove cover and fill unit completely
with water. Inspect for leaks.
1a 1b Leak? Call customer
care at 913-951-3300
8a – 5p M – F CST
1 Test tank for water tightness
2 Configure outlet diffuser and install cleanout plugs
2h
Remove diffuser
from saddle.
Side outlet
Straight-through
Remove
saddle adapter.
Remove
diffuser foot.
2b 2c 2d2a
Install saddle adapter
on desired outlet.
2e
Install
cleanout
plugs into
unused outlet
connections using
pipe thread sealant or tape
approved for use with plastics.
2f
Seat diffuser firmly
into saddle.
2g
Choose outlet
location.
Rotate diffuser
top toward
desired outlet,
while ensuring
foot is pointed
toward the
back wall of the
unit. Reaach
to foot.

BURIED INSTALLATION
Interceptor
Interceptor
Interceptor
Figure 1
Remove inlet diffuser. Remove red flow control plate from
inlet diffuser and discard.
Remove inlet saddle adapter.
3a 3b 3c
Depending on which flow rate is
desired, snap-in the "35 GPM" or
"50 GPM" white flow control plate
as shown on inlet saddle adapter.
Re-install saddle adapter, ensure
flow control plate opening is down
as shown.
Seat inlet diffuser firmly into
saddle adapter.
3e 3f3d
• If dimension "A" above is 5 feet or less go to Step 4, Connect Piping.
• If dimension "A" above is greater than 5 feet follow Steps below.
Page 8 of 9
3 Calibrate Flow Control
GB2 Installation Guide
Note to Plumbing Inspector
This interceptor includes certified internal
flow control and does not require a
dedicated “Flow Control Vent” (air intake).

BURIED INSTALLATION
Page 9 of 9
GB2 Installation Guide
Set interceptor and connect piping using pipe thread sealant or tape
approved for use with plastics, fill tank with water so that it remains in
place during backfill.
Choose inlet and outlet fiings
(included) based on pipe size.
4c
Excavate hole 6" larger than interceptor on all sides. Add crushed aggregate (approximately 3/4" size rock or sand,
with no fines) to base of hole.
4a 4b
6" or more
6"
6"
6"
6a1
Backfill evenly around tank using crushed aggregate
(approximately 3/4" size rock or sand, with no fines), finish
with a minimum 4" thick concrete pad. Vent per local code.
4" min.
concrete pad
Backfill450 lb.
max load
6a2
See instructions included with FCR1 riser.
4" min.
concrete pad
Backfill1,000 lb.
max load
Tile
Floor Sink Installation
Fernco or similar
rubber flow
restriction end cap
Interceptor
Interceptor
Interceptor
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.
4 Connect Piping
6 Backfill and Finished Grade
5 Wet or Air Test Piping Per Local Code
4c1
3" FPT
4" FPT
4" FPT
4" FPT
OR
OR
OR
Doing so may result in property damage, personal injury or death.
DO NOT AIR TEST UNIT OR RISER SYSTEM!
1
Leak? Call customer care at
913-951-3300
8a – 5p M – F CST