Installation Guide

ZURN WILKINS
1747 Commerce Way, Paso Robles, CA 93446 Phone:[phone] Fax:[phone]
Model 375XL, 375XLB, 375ST LEAD-FREE*
Reduced Pressure Principle Assembly (1/2", 3/4" & 1")
*This product contains a weighted average lead content less than 0.25% for wetted surfaces.
*Meets the requirements of NSF/ANSI 61
CAUTION: Installation of Backow Pre-
venters must be performed by qualied,
licensed personnel. The installer should
be sure the proper device has been
selected for the particular installation.
Faulty installation could result in an
improperly functioning device.
ZURN WILKINS Model 375 Reduced Pres-
sure Principle Backow Preventers are for
use on potable water lines where a health
hazard could exist if a backow situation
were to occur.
Proper performance is dependent upon
following these installation instructions and
prevailing governmental and industry stan-
dards and codes. Failure to do so, according
to ZURN WILKINS Limited Warranty "...
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.
Damage to the device could result wherever
water hammer and/or water thermal expan-
sion could create excessive line pressure.
Where this could occur, shock arresters and/
or pressure relief valves should be installed
downstream of the device.
1. Before installing a Model 375
Backow Preventer, ush the line
thoroughly to remove all debris, chips
and other foreign matter. If required, a
strainer should be placed upstream of
the Backow Preventer.
CAUTION: Do not use a strainer in sel-
dom used emergency waterlines such
as re lines.
2. Provide adequate space around the
installed unit so that the test cocks
will be accessible for testing and
servicing.
3. WARNING: If installation of a Model
375 is in a building, a suitable drain
arrangement MUST be provided
to drain off spillage from the relief
valve. An air gap at least two times
the pipe diameter must be provided
between the relief valve and the
drain piping to prevent a cross-con-
nection. Air Gap AG-11 not intended
to support weight of drain pipe.
CAUTION: Do not pipe the relief valve
solidly to a oor drain, sewer or sump.
CAUTION: An adequately sized drain
is required to prevent possible water
damage due to relief valve discharge.
375 REDUCED PRESSURE PRINCIPLE
1. Start with both shut-off valves
closed. Slowly open the inlet shut-off
valve until the backow preventer
is completely pressurized. A brief
discharge from the relief valve may
occur while the device is pressurizing.
The discharge should cease by the
time the shut-off valve is fully open.
Device should function properly. If
the discharge does not stop, refer to
"MAINTENANCE INSTRUCTIONS"
for repair procedures.
2. After the device has been pressur-
ized, vent all trapped air from both
check valves by slightly opening each
of the four test cocks.
3. Slowly open the downstream shut-off
valve. The Model 375 Reduced Pres-
sure Principle Backow Preventer is
now in service.
4. If "spitting" or intermittent discharges
from the relief valve are noted, it could
be a result of pressure uctuation and/
or a water hammer condition in the
system. If such conditions exist, install
a ZURN WILKINS water pressure
reducing valve, a ZURN WILKINS
Model 40XL check valve, or a ZURN
WILKINS Model 1250XL water ham-
mer shock arresters in compliance
with industry standards as needed.
5. After the Model 375 has been prop-
erly installed, test the device (see
"TEST PROCEDURES"). If the de-
vice fails the test, remove the rst and
second check valves and thoroughly
ush the device. If the relief valve
fails to operate properly, inspect the
sensing passage for clogging (see
"MAINTENANCE INSTRUCTIONS").
Clean rubber seals of all debris and
place unit back in service.
4. Install valve at least 12 inches above
surrounding ood level.
5. Always consult local codes for
installation methods, approvals and
guidance.
OUTDOOR INSTALLATION
Model 375 Backow Preventers may be
installed outdoors only if the device is
protected against freezing conditions.
Exposure to freezing conditions will result
in improper function or damage to the
device. The installation location must be
kept above 32°F. All the basic installation
instructions apply.
If installation is in a pit or vault, the Backow
Preventer must never be submerged in water
because this will cause a cross-connection.
Make sure that the pit or vault always remains
dry by providing ample drainage.
INDOOR INSTALLATION
Indoor installation is preferred in areas
that are subject to freezing conditions. All
the basic installation instructions apply to
such installations.
PARALLEL INSTALLATION
Where uninterrupted service from a single
meter connection must be maintained, two
or more Backow Preventers may be con-
nected in parallel. All the basic installation
instructions apply to parallel installation.
Be sure to allow adequate room between
the units for testing and repair.
PLACING THE DEVICE IN SERVICE
After the installation of a Model 375 has
been completed, place the unit in service
as follows:
1
 Installation  Testing  Maintenance Instructions
INLET SHUT OFF
DIRECTION OF FLOW
30" MAX.
12" MIN.
ENCLOSURE
AIR GAP
OPTIONAL
WATER METER
FLOOR
DRAIN
2" PIPE (DRAIN LINE CAN
BE ANY STANDARD PIPING MATERIAL)
WILKINS
XL
PROTECTIVE
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