Schier GB-250 User manual

INSTALLATION GUIDE
Model #GB-250 100 GPM Grease Interceptor
For Indoor/Outdoor Use
Contents
Special Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
General Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Field Cut Riser Installation Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Anchor Kit Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Expanding Grease Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Application Specific Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Document #: 057-0780-05
Find these instructions online at: schierproducts.com/pages/gb-250

page 2 of 6
When Installing Interceptor Inside
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 above for
guidance. For detailed guidance on indirect connections, go to:
hp://webtools.schierproducts.com/Technical_Data/Indirect_Connections.pdf
SPECIAL PRECAUTIONS
For All 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.
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.
Interceptor
Interceptor
Interceptor
max water table
height for direct burial
model AK1 anchor kit
Fully Support
Base of Unit
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
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.
Interceptor
Interceptor
Interceptor
concrete floor
suspended installation
Fernco or similar
rubber flow
restriction end cap
Hydrostatic Slabs
(or 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.
Interceptor
Interceptor
Interceptor
concrete slab subject
to hydrostatic pressure
watertight concrete vault
Support Inlet and
Outlet Piping
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 fiings.
Interceptor
Interceptor
Interceptor
pipe supports
High Temperature Kitchen Water
If water is entering the interceptor at excessive temperature (over 140º F), a
drain water tempering valve (DTV) and approved backflow prevention assembly
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).
Interceptor
Interceptor
Interceptor
cold water supply line
high temperature effluent ( > 140º F)
approved backflow prevention assembly
DTV (drain water tempering valve)
directly connected indirectly connected
Interceptor
Interceptor
Interceptor
installation
instructions
057-0780-05

page 3 of 6
LEAK/SEAL TESTING
Cap/plug all base unit plumbing connections and remove covers. For base
unit testing, fill with water to just above the highest connection. For riser
system testing (if required) fill with water to finished grade level. CAUTION:
Risers must be supported before filling with water to prevent tipping.
Inspect unit, connections and all gaskets and clamps (if applicable) for leaks.
Check water level at specific time intervals per local code.
GENERAL INSTALLATION INSTRUCTIONS
Schier grease interceptors are manufactured with an internal flow control
system. They do not require an external flow control system or air intake
vent. Schier grease interceptors are not to be installed in any other
manner except as shown. Consult local codes for separate trapping
requirements, cleanout locations and additional installation instructions.
1. Flow control is not pre-installed on this unit - a flow control plate is
provided in a bag fastened to the neck of the unit. When unit is installed
13 feet or more below fixtures being served, or a high flow/increased
head pressure condition exists (causing a flow rate above the desired
flow rate), install the inlet diffuser flow control plate to maintain proper
flow rate.
2. Set unit on level solid surface as close as possible to fixtures being served.
3. Connect outlet diffuser to the desired outlet (A,B,C). Unit is shipped with
the outlet diffuser in location B and sealing caps on locations A and C.
Fixed outlet models (-FO) have outlet diffuser permanently welded at
the factory in the straight-through (B) position.
4. Connect inlet and outlet drainage lines to unit. Mechanically couple
pipes to unit. Do not solvent weld.
5. For unit with cast iron covers, remove retainer clips prior to burial.
NOTE: Do not install below a hydrostatic slab.
BELOW GRADE INSTALLATION INSTRUCTIONS
EXCAVATION
1. Surrounding soil must be undisturbed soil or well compacted
engineering fill.
2. Width and length of excavation shall be a minimum of 12" greater than
the tank on all sides and depth shall be 6" deeper than tank boom.
3. Set the tank level on a 6" deep layer of well-packed crushed aggregate
material and connect waste piping per General Installation Instructions.
BACKFILL
1. Preparation of sub grade per geotech recommendations.
2. Stabilize and compact sub grade to 95% proctor.
3. Fill unit with water before backfilling to stabilize unit and prevent float-out
during backfilling. Secure covers and risers (if necessary) to the unit.
4. 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.
FINISHED CONCRETE SLAB
Slab must extend 18" minimum outside the footprint of the unit.
Pedestrian traffic or greenspace areas: 4" Thick reinforced concrete
slab required.
Vehicular traffic areas: Minimum 8" Thick concrete slab with rebar
required. Thickness of concrete around cover 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.
WARNING! DO NOT AIR TEST UNIT OR FIELD CUT
RISER SYSTEM! Doing so may result in property damage,
personal injury or death.
EXCAVATION AND
BACKFILL DETAIL
FLOW CONTROL
PLATE DETAIL
Optional anchor kit
Optional
anchor kit
Risers to Grade
Native soil
Backfill
Well packed base
Concrete slab
Finished grade
Adapter
Riser
Recommended 2-Way
cleanout tee to grade
(by others)
Finished grade
Finished grade
4"
8" (Vehicular traffic)
TOP VIEW
ELEVATION VIEW
CONCRETE SLAB DETAIL
Rebar
18"
min 18" min
18" min
45º
18" min
Rebar
Concrete Slab
4"Thick for pedestrian
8" Thick for vehicular
SIDE VIEW DETAIL
057-0780-05
INSTALLATION (1 of 3)

page 4 of 6
Table 1
Riser Height Needed Risers Required
0 - 3-1/2" None (use adapter)
5" - 23" SR24 (x2)
>23" - 38" LR24 (x2)
>38" - 43" SR24 (x4)
>43" - 58" SR24 (x2) + LR24 (x2)
>58" - 72" LR24 (x4)
Riser
Height
Needed
Adapter
Riser
Cut Line
Alignment Mark
Figure 1 - Riser Measurements
6"
2"
4"
LR24
Long Riser
Adapter
SR24
Short Riser
Adapter (shown)
or Riser
Cover
Gasket
Upper Band Clamp
(
field adjustable)
Lower Band Clamp
(
factory set - do not
adjust or remove)
GB Unit (shown)
or Riser
Anchor hook
Anchor strap
Anchor plate
Figure 2 - Insertion Depths
ANCHOR KIT INSTALLATION DETAIL
2-1/2" Minimum Insertion Depth
4" Maximum Insertion Depth
(into GB unit only)
FIELD CUT RISER (24 SERIES)
INSTALLATION GUIDELINES
Tools needed: 7/16" Nut driver tool/bit (included), marker (included), tape
measure and drill with 1/2" chuck. Jigsaw, circular saw or reciprocating
saw will be needed if risers need to be cut.
NOTE: To remove a component or adjust its position, the Upper Band
Clamp needs to be loosened or removed using nut driver bit. The
Lower Band Clamp is factory set and should not be removed. For
proper fastening ensure clamps are tightened to 5 - 8 ft lbs. of torque
(same as a rubber no-hub coupling) prior to installation.
Riser Assembly Instructions/Steps
1. Set unit so the pipe connections line up with job site piping and
measure riser height needed from top of cover to finished grade.
See Table 1 to select risers needed.
2. Remove covers from adapters. Remove adapters from main unit.
On a level surface, pre-assemble the risers and adapters,
adjusting the components upwards or downwards to achieve the
riser height needed. Make sure to maintain minimum and
maximum insertion depths as shown in Figure 2. If components
are too long, make a circular line around the sidewall with marker
and cut with a power saw. The lowest cut line on the riser assembly
will be 6" beyond the riser height needed to allow for ideal insertion
depth (See Figure 1). An alignment mark should be drawn 2"
beyond the riser height needed which will align with the top of the
base unit gasket. DO NOT cut the alignment mark. The Adapters
and risers should sit level with each other. Tighten upper clamps
to keep riser/adapter assembly from shifting. Make alignment
marks on the sidewalls at the top of all riser gaskets to aid final
assembly.
3. IMPORTANT: Before the next step, make sure both diffusers are
installed inside the main unit at the appropriate locations. Check if
there needs to be any flow control adjustment at the inlet diffuser
(see general installation instructions).
4. Take apart riser assembly and clean all sidewalls and insides of
gaskets to remove dust/debris. Install components into the main
units starting from the lowest riser and work your way up to finished
grade. Ensure that riser will not interfere with diffuser, allow min. 1"
clearance. Maintain minimum and maximum insertion depths for all
components (see Figure 2). Tighten Upper Clamps to specified
torque after correctly positioning components. Riser assembly may
need to be supported during backfill.
5. If tilting of the adapter is required to be flush with grade, do so
AFTER all clamps have been tightened with riser(s)/adapter in a
vertical and level position. Tilting is done using gasket flexibility.
Tilting before tightening clamps may ruin a perfect gasket seal.
Schier recommends tilting only the adapter versus the entire
riser assembly to make sure your riser height and proper tank
access is maintained.
6. If riser height conditions change after completing above steps,
there may be room for adjustment. As long as minimum and
maximum insertion depths are maintained (see Figure 2), the
adapters/risers can be adjusted/cut as many times as neces-
sary.When riser system installation is complete, see Leak/Seal
Testing procedure if required (pg 3 of 6).
ANCHOR KIT INSTALLATION
Stainless steel anchor kit is recommended for installation in high
water table conditions to prevent float out. Necessity to be deter-
mined by specifying engineer. Hold down force achieved by backfill
weight acting on Anchor Plate.
Slide Anchor Hook over tie down point on end wall and bolt to Anchor
Strap. Bolt Anchor Strap to Anchor Plate using provided stainless
steel hardware. If required, Anchor Plate may be bolted to concrete
slab using provided holes.
Field Cut Riser
Components
057-0780-05
INSTALLATION (2 of 3)

page 5 of 6
057-0780-05
EXPANDING GREASE CAPACITY
Multiple grease interceptor configurations must be piped
as shown to ensure the system works properly as
designed. For below grade installations, all units must be
level in the excavation pit. Hybrid systems combining
parallel and series installations are available per wrien
approval from Schier.
All inlet manifolds, outlet manifolds, piping between units
and two-way cleanout tees by others.
SERIES INSTALLATION OF
MULTIPLE GREASE INTERCEPTORS
For lower flow rates and higher grease storage requirements.
For below grade installations it is recommended to install a
two-way cleanout tee extended to finished grade before the
inlet of the first unit, after the outlet of the last unit and in
between units (if there is a long run of pipe between units)
for line cleaning purposes.
NOTE: When the flow control plate is required, it should
only be installed on the first unit in the series.
PARALLEL INSTALLATION OF MULTIPLE
GREASE INTERCEPTORS
For flow rates above 100 GPM and higher grease
storage requirements.
Units must be equally spaced to ensure equal effluent
flow distribution.
For below grade installations it is recommended to install a
two-way cleanout tee extended to finished grade before
and after each unit for line cleaning purposes.
Flow Splier™ (FS-DUO, FS-TRIO, FS-QUAD) sold separately.
INCREASING SOLIDS CAPACITY
This unit has been tested and certified for a high grease
capacity, leaving lile room for solids. Solids capacity may
be increased by removing the outlet diffuser and cuing off
the diffuser boom. See detail for guidance. Replace diffuser
after trimming.
Field Adjustable FOG to Solids Capacity is patent pending.
NOTE: A grease interceptor modified in this manner is
no longer certified.
Two-way cleanout tee
extended to grade
(provided by others)
FS-DUO
Inlet
manifold
Outlet
manifold
PARALLEL INSTALLATION CONFIGURATIONS
200 GPM
2,152 Grease Lbs.
300 GPM
3,228 Grease Lbs.
400 GPM
4,304 Grease Lbs.
FS-TRIO FS-QUAD
Top View of 4 GB-250
Units Piped in Series
Two-way cleanout tee
extended to grade
(provided by others)
INSTALLATION (3 of 3)
SERIES INSTALLATIONS (Preferred)
Rated Grease Capacites
for Units Piped in Series
No. of Removal Efficiency
Units 100 GPM
in Series 92.9%
2 2,152
3 3,228
4 4,304
5 5,380
6 6,456
7 7,532
8 8,608
GB-250 is certified to ASME A112.14.3 (Type C) and
CSA B481.1 and includes an internal flow control.
External flow control with vent not required.

APPLICATION SPECIFIC DETAILS
page 6of 6
Serving an Apartment Complex
Inside a Corroded Concrete Unit
Installation with Sampling Port SV24-L4
Basement Installation with Pumpout Port Kit
Piping By Others
Pumpout port
kit (By Schier)
(Provided in kit)
Valve optional
057-0780-05
GBHC-250 as Solids Interceptor in front of
GBHC-250 as Grease Interceptor Additional Venting for Floor-Below Installations
Vent must terminate
above the top rim of
the sink
Kitchen Floor
Vent Stack
*Venting examples shown are typical,
check local code for requirements
Add this vent if unit is
installed one or more
floors below the
fixtures being served