Watts AMES LF920GD Series Specification, Installation, And Adjustments Manual

Engineering Specification, Installation, Operation and Maintenance
Series LF920GD / LF620GD
Pressure Relief, Sustaining, or Backpressure Control Valve
Sizes: 11/4" to 24"
WARNING
!
Read this Manual BEFORE using this equipment.
Failure to read and follow all safety and use information
can result in death, serious personal injury, property
damage, or damage to the equipment.
Keep this Manual for future reference.
WARNING
!
Local building or plumbing codes may require modifica-
tions to the information provided. You are required to
consult the local building and plumbing codes prior
to installation. If the information provided here is not
consistent with local building or plumbing codes, the
local codes should be followed. This product must be
installed by a licensed contractor in accordance with
local codes and ordinances.
WARNING
!
Need for Periodic Inspection/Maintenance: This product
must be tested periodically in compliance with local codes,
but at least once per year or more as service conditions
warrant. All products must be retested once maintenance
has been performed. Corrosive water conditions and/or
unauthorized adjustments or repair could render the product
ineffective for the service intended. Regular checking and
cleaning of the product's internal and external components
helps assure maximum life and proper product function.
NOTICE
For Australia and New Zealand: Pipeline strainers should be
installed between the upstream shutoff valve and the inlet of
the backflow preventer.
It's important that this device be tested periodically in compli-
ance with local codes, but at least once per year or more as
service conditions warrant. If installed on a fire sprinkler system,
all mechanical checks, such as alarm checks and backflow
preventers, should be flow tested and inspected internally in
accordance with NFPA 13 and NFPA 25.
Watts product specifications in U.S. customary units and metric are ap prox i mate and are pro vid ed for ref er ence only. For precise mea sure ments, please contact
Watts Tech ni cal Ser vice. Watts re serves the right to change or modify prod uct de sign, con struc tion, spec i fi ca tions, or ma te ri als with out prior notice and without
in cur ring any ob li ga tion to make such chang es and mod i fi ca tions on Watts prod ucts previously or sub se quent ly sold.
Submittal Package

Table of Contents

Engineering Specifications
ACV Schematic
Basic Valves
Standard
Optional Components
Installation, Operation and Maintenance
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Valve Servicing Dimensions
Setting the Pressure Controls
ACV Maintenance Schedule
Troubleshooting Guide
Valve Disassembly Instructions
LF920GD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
. . . . . . . . . . . . . . . . . . . . . . . 19
ES-A-ACV-LF920GD
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