Zurn Wilkins P4000AHR Installation, Start-Up, Maintenance Instructions

Model P4000A & P4000AHR
Thermal Expansion Relief Valve
1/2" & 3/4"
Installation


DESCRIPTION

The Zurn Wilkins P4000A Thermal Expansion Relief Valve is a direct
acting relief valve. The P4000A uses a spring to force the plunger down
upon a seat causing the valve to be normally closed. The P4000A can
be set to relieve pressures from 50 to 200 psi and the P4000AHR from
150 to 300 psi. When the inlet pressure reaches the set pressure point
it pushes up on the diaphragm which pulls the plunger off the seat. The
valve opens to relieve pressure at the inlet and allows water to flow
downstream. The P4000A opens and closes within a close pressure
range of the set pressure. All the instructions and references apply to
both models, P4000A & P4000AHR.

Installation / Start-up

INSTALLATION
NOTE: Prior to installation of the P4000A, ensure all debris is flushed
out the piping system.
1. During the installation of a P4000A in a sprinkler system, Underwriter
Laboratories (UL) requires NFPA 13 "Standard for Installation of
Sprinkler Systems" be followed.
2. Upon installation UL also requires that the P4000A be tested in
accordance with NFPA 13. Thereafter the valve shall be inspected,
tested, and maintained in accordance to NFPA 25 "Standard for the
Inspection, Testing, and Maintenance of Water-Based Fire Protec-
tion Systems".
3. For making adjustments and servicing allow for adequate space
around the valve.
4. Position the P4000A in line matching the direction of flow as indi-
cated on the valve model tag with the proper direction of flow in the
system. Once attached to line double check all fasteners are tight
and there is no damage prior to pressurizing system.
NOTE: Pressure in some applications can be very high so be thor-
ough in checking and inspecting for proper installation and makeup.
WARNING: Supply adequate drainage on the discharge of the P4000A.
To avoid water damage, valve must be plumbed to a safe drain.
5. Zurn Wilkins valves are designed to operate in both the vertical and
horizontal positions.
START-UP
CAUTION: To prevent personnel injury and damage to equipment check
that downstream venting is adequate prior to start-up and test proce-
dures. All adjustments under pressure should be made slowly.
NOTICE: Annual inspection and maintenance is required of all plumbing system components. To ensure proper performance and
maximum life, this product must be subject to regular inspection, testing and cleaning.
WARRANTY: ZURN WILKINS Valves are guaranteed against defects of material or workmanship when used for the services recommended. 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.
!
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
!
ADVERTENCIA: Cáncer y daño reproductivo - www.P65Warnings.ca.gov
!
AVERTISSEMENT: Cancer et néfastes sur la reproduction - www.P65Warnings.ca.gov
®
Start-up
 
1. Turn the adjustment screw clockwise until the valve spring is com-
2. With the inlet of the P4000A pressurized slowly turn the adjustment
3. The valve is set to relieve pressure at the current inlet pressure at
NOTE: The valve must be set 10 psi greater than the maximum
anticipated system pressure.
*Note: Pressure change per turn is approximate. Use a gauge at
the inlet of P4000A to set /check relief pressure.
4. To verify proper operation of the P4000A, view the valve during
1747 Commerce Way, Paso Robles, CA 93446 Phone:855-663-9876 Fax:805-238-5766
Maintenance Instructions
P4000A
pressed fully.
Caution: Do not over tighten the adjustment screw to prevent
damaging the valve.
screw counterclockwise until the first sign of water flow. Either listen
carefully to the valve for water flow or look through a downstream
sight glass.
the first sign of water flow through the relief valve. If the desired set
pressure is different than current inlet pressure use the table below.
Turn the adjustment screw clockwise to increase set pressure or
counterclockwise to decrease set pressure. Add or subtract from the
current inlet pressure by turning the adjustment screw the number
of turns required to reach the desired set pressure based on the
adjustment table.
Relief Pilot Pressure Change per
Adjustment Range
50 - 200
150 - 300
normal operation and check the valve for relief setting. Adjustments
can be made at anytime.
FM
APPROVED
P4000AHR
Turn (PSI)*
23
28.5
ZURN WILKINS
www.zurn.com
®
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