2
HG-4 SUB-SURFACE DISCHARGE UNIT
Installation Instructions
GENERAL
INSTALLATION
Site Evaluation
Each Hydro-Guard® System
installation is unique and will
require a minimum of advance
planning. Prior to the installation of
the device, the drainage patterns
for the intended installation location
should be reviewed. The drainage
pattern must permit discharged
water to flow away from the Hydro-
Guard® Unit. Discharged water
flushed from the Hydro-Guard®
Unit must be routed away from
the device. It is recommended
that a 6" catch pipe (by others)
be installed inside of the HG-4's
external cabinet. The catch pipe
5.
Backfill the hole around under,
and inside of the Unit's below
grade base with clean fill and/
or #57 stone. Backfilling should
be accomplished in 6" compacted
lifts. Check that the Unit Is level.
6.
After installation is complete,
sod the area around the
Hydro-Guard® Unit or take other
steps in order to prevent erosion.
Inspect the area immediately
around the Unit in order to ensure
that the existing ground cover
Overview
The Hydro-Guard® HG-4 Sub-
Surface Discharge Unit, the
industry's premium patented,
programmable flushing apparatus,
is suitable for year-round use in
cold to extreme cold climates.
This Automatic Flushing System
has been designed, engineered,
and manufactured to provide
outstanding dependability and
performance.
Please read and retain this manual
for future training, reference,
troubleshooting, and maintenance.
Hydro-Guard® HG-4 Unit
1.
Remove the Hydro-Guard® Unit
from Its packaging and inspect for
possible damage during shipping.
2.
Turn off service line feed.
Excavate a suitably-sized ditch
ensuring It is connected on one
side to the utility's service line
trench. Remove any debris that
might create uneven pressure
on the Unit. Compact the bottom
of the hole in order to minimize
settling after installation. Place
approxmiately 1-1/2 to 2 feet
of #57 stone below the base of
the HG-4 to allow for drainage.
Then install non-compacted clean
bedding material within the bottom
of the hole.
3.
Slowly lower the Hydro-Guard®
Unit into place, pressing it firmly
Into the noncompacted bedding
material until It is fully seated.
Ensure that the Unit is level before
beginning the backfilling operation.
The top of the black base of the
enclosure should be approxi mately
1" above the final grade.
4.
Connect the utility's water
system to the Hydro-Guard® Unit
by means of the 2" threaded
connection.
shall be mounted at least 3" under
the discharge piping of the HG-4
(see Typical Installation illustration).
The 6" pipe shall be installed
a minimum of 24" below grade
before a 90-degree bend or pipe
size reduction. If desired, the 6"
pipe can be reduced to a 3" or 4"
pipe to continue the routing of the
flow to a final discharge point. The
recommended final discharge points
may include a storm drain, drainage
or retention pond, or a storm swale.
In the event static pressure is
routinely above 110 psi, Mueller
recommends installing a Pressure
Reducing Valve ahead of the Hydro-
Guard Flushing System."
is not subject to severe erosion.
You may opt to create a custom
installation to best suit your needs.
7.
Disinfect the Hydro-Guard®
Flushing Device in accordance
with the utility's policy. DO NOT
exceed the dosage and contact
times recommended by the
AWWA.
8.
The Hydro-Guard® Automatic
Flushing Device may now be
pro grammed and placed into
service.
Summary of Contents for Hydro-Guard HG-4
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