Install Instructions

Models: 800M4FR, 800M4QT, 4800M4QT, LF800M4FR,
LF800M4QT
Installation
Requirements:
1. Install 12" (305mm) above highest point of downstream piping see Fig. 1.
2. Install bonnet side up and allow for accessibility for testing/service.
3. Install where discharge or spillage is not objectionable.
4. Do not undersize supply or oversize the valve in relation to demand.
5. Do not install where backpressure can occur.
6. Protect from freezing - for Freeze Protection specify Model 800M4FR or LF800M4FR.
Freeze protection can also be provided using a WattsBox insulated enclosure. Send
for ES-WB for additional information.
7. ASSE Standard 1020 requires that the atmospheric vent valve remains open until the
valve body pressure exceeds 1 lb. Until this pressure is reached, some amount of spill-
age will occur at the atmospheric vent. In order to minimize this leakage on
start-up
close the down stream shutoff valve and open inlet shutoff valve quickly.
Service:
1. Open test cocks to drain in cold climates if only operated seasonally.
2. Replace rubber goods every 5 years.
Watts 800M4QT
1
⁄2",
3
⁄4"
(15, 20mm)
Watts 800M4QT
1" - 2" (25 - 50mm)
RP/IS-800M4QT
Installation, Maintenance, & Repair
Series 800M4 and LF800M4
Anti-Siphon Pressure Vacuum Breaker
featuring Replaceable Seats
Sizes:
1
/2" - 2" (15 - 50mm)
Pressure — Temperature
Working Temperature: 33°F - 140°F (0.5°C - 60°C)
Maximum Pressure: 150psi (10.3 bar)
Min. Pressure: 15psi (103 kPa)
WattsBox
Fig. 1
You are required to thoroughly read all installation instructions and product safety infor-
mation before beginning the installation of this product. FAILURE TO COMPLY WITH
PROPER INSTALLATION AND MAINTENANCE INSTRUCTIONS COULD RESULT
IN PRODUCT FAILURE WHICH CAN CAUSE PROPERTY DAMAGE, PERSONAL
INJURY AND/OR DEATH. Watts is not responsible for damages resulting from improper
installation and/or maintenance.
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 followed.
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
!
1. Close main shutoff valve.
2. Open upstream drain, test cocks and isolation ball
valves to depressurize line.
3. Purge with pressurized line.
4. Leave test cocks and isolation ball valve handles in
45° angle to drain ball valves and prevent casting
damage.
Flow
Upstream (Inlet) Drain
Freeze Protection Guidelines
Purging of a PVB Assembly with Pressurized Air
Outlet Drain
Valve
12" Minimum Clearance
Above the Highest Point of
Downstream Piping
Zone Control
Valve Pit
Sprinkler System
Piping
Union
Main Shutoff Valve
▼
▼
Testing
For field testing procedure, send for IS-TK-DL, 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.