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TABLE OF CONTENTS 

PAGE

OPERATING INSTRUCTIONS MANUAL

        WARNING: 

1. Each person involved in the assembly, Installation and/or maintenance of the 

Hydro-Guard Automatic Flushing Device must read this manual carefully and follow 

all instructions prior to performing any installation or maintenance procedures 

involving the Unit. 

2. Verify the drainage path prior to installation to ensure that pedestrian and 

vehicular hazards will not be created by the installation and use of the Hydro-

Guard Automatic Flushing Device (in areas in which freezing may occur, special 

attention should be given to this procedure). 

3. Never assemble, disassemble, or perform Hydro-Guard maintenance unless the 

influent supply valve has been closed, verified and secured, and internal piping 

pressure has been relieved. 

4. Always use all necessary safety equipment and follow all recommended 

procedures when installing, operating and maintaining the Hydro-Guard Automatic 

Flushing Device. 

5. Perform annual safety inspections and replace worn or defective parts. 
6. Operate the Hydro-Guard Automatic Flushing Device only when fully installed and 

correctly assembled.

        CAUTION: 

The recommended optimal operating pressure for a Hydro-Guard® Automatic Flushing 

System is between 20psi and 120psi. In the event pressure may exceed 120psi it 

is recommended that a Pressure Regulating Valve be installed ahead of the Hydro-

Guard flushing system. 

Customer Service Center  

Decatur, Illinois  

800.798,3131  

www.muellercompany.com/hydro-guard  

moreinfo@muellercompany.com

HG-4  

Sub-Surface  

Discharge Unit

Installation Instructions  

2

Programming Unit  

Disassembly and Reassembly 
Instructions 4

Options and Upgrades  

5

Parts 6

F 12775 1/21

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Summary of Contents for Hydro-Guard HG-4

Page 1: ...d internal piping pressure has been relieved 4 Always use all necessary safety equipment and follow all recommended procedures when installing operating and maintaining the Hydro Guard Automatic Flush...

Page 2: ...ine 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...

Page 3: ...enoids will come from the manufacturer with the plunger already magnetically latched open some zones will default to OPEN Follow the start up procedure for systems with DC Latching Solenoids Page 09 C...

Page 4: ...HG 4 Battery Replacement 1 Remove protective external cover and unlatch the cover of the Internal protective sleeve 2 Unscrew the cap off the watertight housing of the integrated Bluetooth programmin...

Page 5: ...Integrated Sample Station Included A standard feature on the HG 4 Sub Surface Discharge Unit Hydro Guard s Sample Port allows the end user to collect the sample You may wish to run a brief manual mod...

Page 6: ...an Screw HG S128 Relief Valve Sub Assembly HG S126 Insulation Star Sub Assembly 546549 HG 4 Top Plate Sub Assembly HG 2201 DIV 1021 R HG 21088 HG 4 Name Plate HG V129 Silver Thermal Insulation HG A200...

Page 7: ...7 NOTES...

Page 8: ...V Ltd All Rights Reserved The trademarks logos and service marks displayed in this document are the property of Mueller Water Products Inc its affiliates or other third parties Products marked with a...

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