Installation, Maintenance, & Repair
Series 919 and LF919
Reduced Pressure Zone Assemblies
Sizes:
1
⁄
4
" – 2" (8 – 50mm)
919QT
RP/IS-919
NOTICE
For Australia and New Zealand, line strainers should be installed
between the upstream shutoff valve and the inlet of the backflow
preventer.
Its important that this assembly be tested periodically in compliance
with local codes, but at least once per year or more as service con-
ditions 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.
Testing
For field testing procedure, send for IS-TK-DL, IS-TK-7,
IS-TK-9A, IS-TK-99E AND IS-TK-99D.
For other repair kits and service parts, send for PL-RP-BPD.
For technical assistance, contact your local Watts
representative.
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.
Installation Guidelines
Reduced Pressure Zone
Assemblies Indoor Installation
For indoor installations, make sure the Series 919 and LF919 is
easily accessible to facilitate testing and servicing. Do not install in
concealed locations. If the location of the Series 919 and LF919 is
parallel and close to the wall, make sure the test cocks are easily
accessible, and the drain line can adequately drain if required. An air
gap and drain line (see literature ES-AG/EL/TC) are piped from the
relief valve connection as shown, allowing evidence of discharge to
be clearly visible and preventing the occurrence of water damage.
Air Gap
Strainer
Meter
Indoor Installation
12" (300mm) Minimum
(refer to local codes)
Watts
1
⁄
4
" – 2" (8 – 50mm) 919
Local building or plumbing codes may require modifications
to the information provided. You are required to consult the
local building and plumbing codes prior to installation. If this
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 accor-
dance with the 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. Cor-
rosive 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 components helps
assure maximum life and proper product function.
WARNING
!
