Zurn Wilkins 34-NR3XLDU 3/4 Inch NR3XL Pressure Reducing Valve Instruction Manual

1. Introduction

This manual provides essential information for the proper installation, operation, and maintenance of your Zurn Wilkins 34-NR3XLDU 3/4 inch NR3XL Pressure Reducing Valve. Please read these instructions thoroughly before installation and retain them for future reference. Adherence to these guidelines will ensure optimal performance and longevity of the valve.

2. Product Overview and Features

The Zurn Wilkins 34-NR3XLDU Pressure Reducing Valve is designed for residential applications, effectively reducing high inlet pressure to a lower, more manageable outlet pressure. This helps protect plumbing systems and appliances from excessive pressure, while also contributing to water conservation.

• Compact Design: Features a short lay length and compact design for installation in tight spaces.
• Easy Maintenance: Cartridge-loaded design simplifies repairs and internal access.
• Versatile Connections: Offers time- and labor-saving tailpiece options including threaded, PEX, copper sweat, and CPVC.
• Debris Protection: Includes a quality integral stainless steel strainer screen to prevent debris buildup.
• Durable Construction: Highly durable, threaded bell resists corrosion and provides easy access to cartridge internals.
• Certifications: ASSE Listed 1003; IAPMO Listed; CSA Certified; Meets the requirements of NSF/ANSI 61.

Figure 2.1: Front view of the Zurn Wilkins 34-NR3XLDU Pressure Reducing Valve.

Figure 2.2: Key features of the NR3XL Pressure Reducing Valve.

3. Safety Information

• Professional Installation Recommended: This valve should be installed by a qualified licensed plumber to ensure proper function and compliance with local codes.
• Water Supply Shut-off: Always turn off the main water supply before attempting any installation or maintenance.
• Pressure Relief: Open a downstream faucet to relieve pressure in the system before disassembling the valve.
• Hot Water Warning: Be aware that hot water can cause burns. Exercise caution when working with hot water lines.
• Do Not Over-tighten: Over-tightening connections can damage the valve and seals, leading to leaks.

4. Installation

Follow these steps for proper installation of the Zurn Wilkins 34-NR3XLDU Pressure Reducing Valve. Refer to local plumbing codes for specific requirements.

1. Prepare the Installation Area:
   • Turn off the main water supply to the building.
   • Open a downstream faucet to relieve pressure and drain water from the lines.
   • Identify the location for the new pressure reducing valve. Ensure there is sufficient space for installation and future maintenance.
2. Flush Supply Line:
   • Before installing the valve, flush the supply line to remove any loose dirt, scale, or debris that could damage the valve's internal components.
3. Install Valve In-Line:
   • The valve body has an arrow indicating the direction of water flow. Install the valve so the arrow points in the direction of water flow towards the building.
   • The valve can be installed in any orientation (horizontal, vertical, or diagonal).
   • Use appropriate tools to connect the valve to your plumbing system. Ensure all connections are secure but do not over-tighten. The double union FNPT connections facilitate easy installation and removal.
4. Restore Water Supply:
   • Slowly turn on the main water supply, checking for any leaks at the connections.
   • Open downstream faucets to purge air from the system.

Figure 4.1: Ensure the valve is installed with the flow arrow pointing correctly.

Figure 4.2: The threaded bell and fiber union gasket simplify installation.

Installation Overview Video

5. Setup: Adjusting Pressure

The Zurn Wilkins 34-NR3XLDU valve is factory set to approximately 50 PSI. You can adjust the outlet pressure within a range of 15-75 PSI.

1. Attach Pressure Gauge: Connect a reliable pressure gauge to a downstream hose bib or test port to monitor the outlet pressure.
2. Loosen Locknut: Locate the adjustment screw on top of the valve. Loosen the locknut securing the adjustment screw.
3. Adjust Pressure:
   • To increase outlet pressure, turn the adjustment screw clockwise (into the bell housing).
   • To decrease outlet pressure, turn the adjustment screw counter-clockwise (out of the bell housing).
4. Verify Pressure: After each adjustment, open a downstream faucet briefly to verify the correct pressure setting on your gauge.
5. Tighten Locknut: Once the desired pressure is achieved, tighten the locknut to secure the adjustment screw.

Figure 5.1: The valve is designed for residential settings, including single-family and multi-family homes.

6. Operating Instructions

Once installed and adjusted, the Zurn Wilkins 34-NR3XLDU valve operates automatically to maintain a consistent downstream pressure, protecting your plumbing system. No further user interaction is typically required during normal operation.

• The valve continuously monitors and adjusts the water pressure entering your home.
• It is designed to reduce water usage and extend the life of pipes, faucets, and appliances by preventing high-pressure damage.

7. Maintenance

Regular maintenance ensures the continued efficiency and reliability of your pressure reducing valve.

• Annual Inspection: It is recommended that the valve be inspected annually by a qualified licensed plumber to verify correct pressure setting and overall condition.
• Strainer Screen Cleaning: The integral stainless steel strainer screen may require periodic cleaning, especially in areas with high sediment in the water supply. To clean:
  1. Shut off the main water supply.
  2. Relieve downstream pressure.
  3. Carefully disassemble the threaded bell to access the strainer screen.
  4. Clean the screen of any accumulated debris.
  5. Reassemble, ensuring all seals are properly seated and connections are secure.
• Cartridge Replacement: The cartridge-loaded design allows for easy replacement of internal components if wear or damage occurs. Consult a qualified plumber for cartridge replacement.

Figure 7.1: The threaded bell allows for easy access to internal components for maintenance.

8. Troubleshooting

If you experience issues with your pressure reducing valve, consider the following common problems and solutions:

• High Downstream Pressure:
  • Thermal Expansion: If pressure rises overnight or when hot water is used, it may be due to thermal expansion in the hot water heater. This is a normal phenomenon and typically requires an expansion tank. The pressure reducing valve is not designed to prevent thermal expansion.
  • Improper Adjustment: Re-check the pressure adjustment screw setting using a pressure gauge (refer to Section 5).
  • Debris in Valve: The valve may be fouled by debris, preventing it from closing completely. Clean the strainer screen and inspect the cartridge (refer to Section 7).
  • Worn Components: Internal components may be worn. A repair kit or replacement cartridge may be needed.
• Low Downstream Pressure/Flow:
  • Improper Adjustment: The valve may be set too low. Adjust the pressure setting (refer to Section 5).
  • Clogged Strainer: The integral strainer screen may be clogged with debris, restricting water flow. Clean the strainer screen (refer to Section 7).
  • Inlet Pressure Too Low: Ensure the incoming main water supply pressure is adequate.
• Leaks:
  • Loose Connections: Check all connections for tightness. Do not over-tighten.
  • Damaged Seals: Gaskets or O-rings may be damaged or improperly seated. Inspect and replace if necessary.

If troubleshooting steps do not resolve the issue, contact a qualified licensed plumber or Zurn customer support.

9. Specifications

Figure 9.1: Dimensions of the NR3XL Pressure Reducing Valve.

Figure 9.2: Certifications for the NR3XL Pressure Reducing Valve.

10. Warranty and Support

For warranty information or technical support, please contact Zurn Industries, LLC directly. Keep your purchase receipt and model number handy when contacting support.

Zurn Industries, LLC
Website: www.zurn.com