SCHIER GB2 Hydromechanical Grease Interceptor Installation Guide
- June 11, 2024
- SCHIER
Table of Contents
SCHIER GB2 Hydromechanical Grease Interceptor Installation Guide
SPECIAL PRECAUTIONS
For Schier Grease Interceptor Installations – Failure to follow this guidance voids your warranty
WARNING: DO NOT AIR TEST UNIT OR RISER SYSTEM!
Doing so may result in property damage, personal injury or death.
CAUTION: Do not install this unit in any manner except as described in these instructions.
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.
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 canbe 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
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.
High Temperature Kitchen Water
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).
ODOR ALERT!
Do not install air gap on outlet side of interceptor.
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. Models GB-50,
GB-75, and GB-250 use model AK1 anchor kit. Model GB-500 uses model AK2 anchor
kit for use with deadmen anchors. Models GB-1000, GGI-750 and GGI-1500 use
model AK3 anchor kit for use with deadmen anchors.
Flush-to-Grade Burials
Flush-to-Grade buried installations (without a riser) are not recommended for
heavy foot traffic areas without the use of an internal gusset support kit
SGK2 (for GB2) or SGK3 (for GB3).
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.
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
fittings.
GETTING TO KNOW THE GB2
- Cover
- Standard Installation Flow Control Cartridge
- 35 GPM Flow Control Extension (>5′ below kitchen only)
- 50 GPM Flow Control Extension (>5′ below kitchen only)
- Inlet Diffuser (Top)
- Diffuser Retaining Nuts (x2)
- 4″ Cleanout Plugs (x2)
- Optional Side Outlets 4″ FPT (x2)
- Connection Fitting Gaskets (x4)
- Bulkhead Connection\ Retaining Nuts (x4)
- Inlet 4″ FPT Connection
- 3″ Plain End Fittings (x2)
- 4″ Plain End Fittings (x2)
- Diffuser Foot Retaining Nuts (x2)
- Inlet Diffuser (Foot)
- Cover Bolts (x4)
- Cover Gasket
- Air Relief/Visual Access
- Outlet 4″ FPT Connection
- Outlet Diffuser (Top)
- Outlet Diffuser (Foot)
ON THE FLOOR INSTALLATION
Special Precautions
ODOR ALERT!
-
Do not install air gap on outlet side of interceptor.
-
Install interceptor as close as possible to fixtures being served
-
ODOR ALERT!
Interceptor is not a sewer gas trap. All upstream fixtures must be trapped
-
Provide at least 5-1/2″ clearance above unit for routine maintenance.
Test Tank for Water Tightness
1a: Cap all connection points with 4″ cleanout plugs using pipe thread sealant or tape approved for use with plastics.
1b: Remove cover and fill with water to just above the highest connection. For riser system testing (if required) fill to finished grade level.
CAUTION: Support risers before filling to prevent tipping. Inspect unit, connections and gaskets for leaks. Check water level at specific time intervals per local code.
Leak?
Call customer
care at 913-951-3300
8a – 5p M – F CST
Set Up Outlet Diffuser and Install Cleanout Plugs
2a: Choose outlet location.
Side outlet
OR
Straight-through
2b: Unscrew diffuser retaining nut and remove outlet diffus
2c: Unscrew diffuser foot retaining nut and remove outlet diffuser foot.
2d: Rotate diffuser toward chosen outlet, replace foot ensuring it will
point to the back wall of the unit and hand tighten foot retaining nut.
2e: Insert diffuser into chosen outlet and hand tighten retaining nut.
2f: Cap all unused connection points with 4″ cleanout plugs using pipe thread sealant or tape approved for use with plastics.
Calibrate Flow Control
Note to Plumbing Inspector
This interceptor includes certified internal flow control and does not require
a dedicated “Flow Control Vent” (air intake).
If dimension
A. 5 feet or less discard red extension parts, then go to Step 4.
If dimension
greater than 5 feet follow Steps below.
Rotate flow control cartidge counter-clockwise to release and remove from inlet diffuser
Depending on which flow rate is desired, attach either the 35 or 50 GPM Flow
Control Cartridge Extension using PVC primer/cement. Make sure extension is
fully inserted into the cartridge and hold both components firmly together
(until cement grabs) to prevent push-out.
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.
Connect Piping
Choose inlet and outlet fittings (included) based on pipe size.
4b: Connect piping using pipe thread sealant or tape approved for use with plastics. Ensure all upstream fixtures are trapped. Vent per local code.
4b1: Next to Sink
4b2: Under Sink
4b3: Floor Below
Wet or Air Test Piping Per Local Code
WARNING: DO NOT AIR TEST UNIT OR RISER SYSTEM!
Doing so may result in property damage, personal injury or death.
Leak? Call customer care at
913-951-3300
8a – 5p M – F CST
BURIED INSTALLATION
Special Precautions
-
Install interceptor as close aspossible to fixtures being served
-
Risers (25″) Max
-
Max Water Level
Risers are not designed to retain water
Test Tank for Water Tightness
1a: Cap all connection points with 4″ cleanout plugs using pipe thread sealant or tape approved for use with plastics.
1b: Remove cover and fill with water to just above the highest connection. For riser system testing (if required) fill to finished grade level.
CAUTION: Support risers before filling to prevent tipping. Inspect unit, connections and gaskets for leaks. Check water level at specific time intervals per local code.
Leak?
Call customer
care at 913-951-3300
8a – 5p M – F CST
Set Up Outlet Diffuser and Install Cleanout Plugs
2a: Choose outlet location.
Side outlet
OR
Straight-through
2b: Unscrew diffuser retaining nut and remove outlet diffuser.
2c: Unscrew diffuser foot retaining nut and remove outlet diffuser foot.
2d: Rotate diffuser toward chosen outlet, replace foot ensuring it will point to the back wall of the unit and hand tighten foot retaining nut.
2e: Insert diffuser into chosen outlet and hand tighten retaining nut.
2f: Cap all unused connection points with 4″ cleanout plugs using pipe thread sealant or tape approved for use with plastics.
Calibrate Flow Control
Note to Plumbing Inspector
This interceptor includes certified internal flow control and does not require
a dedicated “Flow Control Vent” (air intake).
If dimension is
A. 5 feet or less go to Step 4.
If dimension
greater than 5 feet follow Steps below.
Rotate flow control cartidge counter-clockwise to release and remove from
inlet diffuser
3b: Depending on which flow rate is desired, attach either the 35 or 50
GPM Flow Control Cartridge Extension using PVC primer/cement. Make sure
extension is fully inserted into the cartridge and hold both components firmly
together (until cement grabs) to prevent push-out.
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.
3d: 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.
Excavation
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.
Connect Piping
Floor Sink Installation
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.
5a: Choose inlet and outlet fittings (included) based on pipe size.
5b: Set interceptor and connect piping using pipe thread sealant or tape
approved for use with plastics. Vent per local code.
Fill tank with water so that it remains in place during backfill.
Wet or Air Test Piping Per Local Code
WARNING: DO NOT AIR TEST UNIT OR RISER SYSTEM!
Doing so may result in property damage, personal injury or death.
Leak? Call customer care at
913-951-3300
8a – 5p M – F CST
Backfill and Finished Grade
Below Grade with Riser (preferred): See instructions included with FCR1
riser. 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.
Flush-to-Grade Burials:
WARNING: Not recommended for heavy foot traffic areas without the use of
an internal support system SGK2 (sold additionally). Contact Customer Care for
more details. 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.