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Watts 994 Series - User Manual

Watts 994 Series
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RP/IS-994/994RPDA
NOTICE
Inquire with governing authorities for local installation requirements
NOTICE
For Australia and New Zealand: Pipeline strainers should be installed
between the upstream shutoff valve and the inlet of the backflow
preventer.
994
Installation, Maintenance, & Repair
Series 994/994RPDA
Reduced Pressure Zone Assemblies
Reduced Pressure Detector Assemblies
Sizes: 2
1
2" – 10" (65 – 250mm)
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 is not consistent
with local building or plumbing codes, the local codes should be fol-
lowed.
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. 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 components helps assure maximum life and proper
product function.
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.
Testing
For field testing procedure, refer to Watts installation sheets
IS-TK-DP/DL, IS-TK-9A, IS-TK-99E and IS-TK-99D found on
www.watts.com.
For troubleshooting guide, refer to literature S-TSG.
For other repair kits and service parts, refer to our Backflow Preven-
tion Products Repair Kits & Service Parts price list PL-RP-BPD
found on www.watts.com.
For technical assistance, contact your local Watts representative.

Other manuals for Watts 994 Series

Questions and Answers

  • C
    colin78Jul 28, 2025
    Why does the pressure relief valve not close on my Watts Control Unit?
    • L
      lauren15Jul 28, 2025
      If the Watts Control Unit's pressure relief valve doesn't close, it could be due to several reasons: * Debris on the sealing surface: Remove the relief valve and clean it. * Plugged hydraulic hose: Disassemble and clean the hose. * Damaged seat or rubber shutoff disc: Remove the relief valve assembly and replace it. * Ruptured diaphragm: Disassemble and replace the diaphragm. * Wrinkled or improperly installed diaphragm: Disassemble and properly position the diaphragm.
  • S
    Sara ClarkAug 4, 2025
    What to do if Watts 994 assembly discharges from differential relief valve during a flow condition?
    • D
      Danielle JonesAug 4, 2025
      If your Watts Control Unit assembly discharges from the differential relief valve during a flow condition, it could be due to: * A No. 1 check valve wedged open: Disassemble and clean the No. 1 check valve. * An O-ring displaced from the groove in the 1st check: Disassemble and replace it. * Fluctuating line pressure. Also, this issue might occur if the pressure relief valve does not close; in this case, consult problem D.
  • D
    Diane BrownAug 12, 2025
    Why is my Watts Control Unit assembly discharging from the differential relief valve when there is no flow?
    • J
      jbradyAug 12, 2025
      If the Watts Control Unit assembly discharges from the differential relief valve when there is no flow, consider the following possible causes: * A fouled first check: Disassemble and clean the No. 1 check valve. * Fluctuating inlet pressure: Control the supply line water pressure. Install a soft seated, spring loaded check valve upstream of the assembly. * Outlet pressure higher than inlet pressure and a leak in the No. 2 check valve: Disassemble, clean the No. 2 check valve, and identify the cause of backpressure. * Leak through the diaphragm or around flange bolt holes of the relief valve: Service the relief valve. Also, this issue might occur if the pressure relief valve does not close; in this case, consult problem D.
  • R
    Robert MayoAug 19, 2025
    How to fix a Watts 994 differential pressure relief valve that doesn't open during a test?
    • D
      dtoddAug 19, 2025
      If the differential pressure relief valve on your Watts Control Unit does not open during the test, there are several potential causes: * Differential pressure across the No. 1 check valve stays above 2.0psi due to a leaking outlet gate valve: Repair the shutoff valves. * Weak or broken relief valve spring: Disassemble and replace the relief valve spring. * Shutoff seat tube bound in body: Disassemble and repair. * Plugged hydraulic hose: Disassemble and repair.

Summary

Installation, Maintenance, & Repair Series 994;994 RPDA

General Safety Warning

Read manual before use; failure to follow can result in death, injury, or damage.

Servicing First and Second Checks

Servicing First and Second Checks (8 & 10)

Critical Safety for First Check Servicing

Extreme caution required when servicing the first check assembly.

Servicing the Relief Valve

Testing Reduced Pressure Zone Assemblies

Periodic Testing Warning

Device must be tested periodically per local codes, at least annually.

Troubleshooting Guide

Assembly Discharges During No Flow

Diagnoses and solutions for discharge from relief valve during no flow.

Assembly Discharges During Flow

Diagnoses and solutions for discharge from relief valve during flow.

Differential Pressure Relief Valve Not Opening

Diagnoses and solutions for relief valve not opening during test.

Watts 994 Series Specifications

General IconGeneral
CategoryControl Unit
MaterialBronze
Series994
Connection Size1/2"
StandardsCSA

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