Installation Guide

 Installation  Testing  Maintenance Instructions
Model 460XL LEAD-FREE*
Spill-Resistant Pressure Vacuum Breaker
(3/8", 1/2", 3/4" & 1")
Fig. 1
INSTALLATION INSTRUCTIONS
CAUTION: Installation of Pressure Vacuum breakers must be performed by qualied,
licensed personnel. Faulty installation could result in an improperly functioning device.
The installer should be sure the proper device has been selected for the particular
installation.
ZURN WILKINS Model 460XL Spill Resistant Pressure Vacuum Breakers are for use on
potable water lines where a health hazard could exist if a backsiphonage situation were
to occur. They must not be installed where backpressure may occur.
Proper performance depends upon following these installation instructions and prevail-
ing governmental and industry standards and codes. Failure to do so releases ZURN
WILKINS of any liability that it might otherwise have with respect to that device. Such
failure could also result in an improperly functioning device.
1. Before installing the ZURN WILKINS Model 460XL Spill Resistant Pressure Vacuum
Breaker, ush the lines thoroughly to remove all debris, chips and other foreign matter.
2. The Model 460XL must be installed in a vertical position (see Fig. 1) to provide
proper operation of the air inlet valve.
3. Provide adequate space around the installed unit so that the test cock and bleed
screw will be accessible for testing and servicing.
4. Install the unit such that the critical level mark on the body is at least 12 inches
above the highest downstream piping or water outlet.
5. Always consult local codes for installation methods, approvals and guidance.
6. The Model 460XL Spill Resistant Pressure Vacuum Breaker may be installed out
doors only if the device is protected against any freezing conditions. Warning: do
not block air vent opening with insulation. Exposure to freezing conditions will result
in improper function or damage to the device. The installation location must be kept
above 33°F.
PLACING THE DEVICE IN SERVICE
After the installation of a Model 460XL Spill Resistant Pressure Vacuum Breaker has
been completed, place the unit in service as follows:
1. Start with both shut-off valves closed. Open the inlet shut-off valve until the Spill
Resistant Pressure Vacuum Breaker is completely pressurized.
2. Immediately after the inlet shut-off valve is opened the air inlet valve should close,
preventing any discharge from occurring. If the unit discharges water out the valve, refer
to "MAINTENANCE INSTRUCTIONS". If no discharge occurs, proceed to step 3.
3. Slowly open the No. 2 shut-off valve. The Model 460XL is now in service.
4. After the Model 460XL has been properly installed, test the device. If the device fails
the test, refer to "MAINTENANCE INSTRUCTIONS".
WARRANTY: ZURN WILKINS Valves are guaranteed against defects of material or workmanship when used for the services recom-
mended. If in any recommended service, a defect develops due to material or workmanship, and the device is returned, freight prepaid,
to ZURN WILKINS within 12 months from date of purchase, it will be repaired or replaced free of charge. ZURN WILKINS' liability shall
be limited to our agreement to repair or replace the valve only.
*This product contains a weighted average lead content less than 0.25% for wetted surfaces.
*Certied to NSF/ANSI 61-G
Drain Procedure for Freeze Protection
1. Turn off main shut-off (1) that supplies
water to the system.
2. Open both the inlet and outlet drain
valves in the system (2 & 6). Open the inlet
and outlet ball valves on the Spill Resistant
pressure vacuum breaker (3&5). Open the
test cock and the bleed screw (4&7). Leave
all valves and test cock in the half open/half
closed
(45°) position to allow full drainage of the
valve and test cock.
3. If you "blow out" the system downstream
of the Spill Resistant pressure vacuum
breaker, make sure the outlet drain valve
(6) is open and the Spill Resistant pressure
vacuum breaker shut-off valve (5) is closed.
4. Connect an air hose to the outlet drain
valve (6) and inject an adequate volume of
air to remove all water from the downstream
portion of the system.
5. CAUTION: Open outlet shut-off valve to
the pressure vacuum breaker (5) and outlet
drain valve (6) to the half open/half closed
(45°) position after "blow out" process is
completed.
6. If drain valves (2 & 6) are not part of the
system, and if air pressure is not used to
"blow out" the system, the internal compo-
nents of the pressure vacuum breaker should
be removed for the duration of the winter.
7. Leave all drain valves (2 & 6), shut-off
valves (3 & 5) and test cock in the half open/
half closed position (45°) for the duration
of the winter to prevent freezing. Caution:
Be certain that main shut-off (1) remains
tightly closed to prevent refilling of the
system. Also, the main shut-off valve must
be resilient seated to insure no leakage of
water into the system.
DIRECTION OF FLOW
12" MIN. ABOVE
HIGHEST
OUTLET PIPING
WILKINS
460XL
SVB
-CL-
ZURN
WILKINS
ZURN
WILKINS
12" MIN. ABOVE
HIGHEST OUTLET
DIRECTION OF FLOW
DRAIN
BLEED SCREW (7)
TEST COCK (4)
MAIN SHUT-OFF
VALVE (1)
INLET SHUT-OFF
VALVE (3)
INLET DRAIN
VALVE (2)
OUTLET SHUT-OFF
VALVE (5)
OUTLET DRAIN
VALVE (6)
WILKINS
460XL
SVB
-CL-
WILKINS
ZURN
WILKINS
ZURN
(IF ALLOWED BY
LOCAL CODES)
Proposition 65 Warning This product contains chemicals known to the State of California to cause cancer or birth defects
or other reproductive harm.
®