Introduction
This manual provides essential information for the proper installation, operation, and maintenance of the Watts LF25AUB-Z3 1/2 Pressure Reducing Valve. Please read these instructions thoroughly before installation and retain for future reference. This valve is designed to reduce incoming water pressure to a safe and functional level for domestic water systems.
Figure 1: Watts LF25AUB-Z3 1/2 Pressure Reducing Valve. This image shows the bronze valve body with threaded connections and the adjustable pressure setting mechanism on top.
Safety Information
- Always depressurize the water system before attempting any installation or maintenance.
- Wear appropriate personal protective equipment (PPE), including safety glasses and gloves.
- Ensure all local plumbing codes and regulations are followed during installation.
- If you are unsure about any part of the installation or operation, consult a qualified plumber.
- This valve is for domestic water service only. Do not use for other applications unless specifically approved by Watts.
Setup and Installation
Pre-Installation Checks
- Verify that the valve size (1/2 inch) matches your plumbing system requirements.
- Ensure the valve's pressure range (25-75 PSI) is suitable for your application.
- Inspect the valve for any visible damage before installation.
Installation Steps
- Shut off Water Supply: Locate the main water shut-off valve for your property and turn it off.
- Drain System: Open a faucet at the lowest point in your home to drain the water from the pipes and relieve pressure.
- Select Location: Install the pressure reducing valve on the main water supply line after the main shut-off valve and before any branch lines. Ensure there is sufficient space for future maintenance.
- Prepare Pipe Ends: Clean and prepare the pipe ends for threading. Apply appropriate thread sealant (e.g., PTFE tape or pipe dope) to the male threads of the valve.
- Install Valve: Thread the valve onto the pipe ends, ensuring the flow arrow on the valve body points in the direction of water flow. Tighten connections securely but do not overtighten.
- Restore Water Supply: Slowly open the main water shut-off valve. Check for leaks at all connections.
- Purge Air: Open faucets throughout the house to purge air from the system until water flows smoothly.
Operating Instructions
The Watts LF25AUB-Z3 1/2 Pressure Reducing Valve is factory set to 50 PSI. If a different pressure setting is required, follow the steps below.
Adjusting Outlet Pressure
- Install Pressure Gauge: For accurate adjustment, install a pressure gauge on a hose bib or other suitable point downstream of the pressure reducing valve.
- Relieve Pressure: Open a downstream faucet to relieve any static pressure in the system. Close the faucet once pressure is relieved.
- Adjust Set Screw:
- To increase outlet pressure, turn the adjusting screw (located on top of the valve) clockwise.
- To decrease outlet pressure, turn the adjusting screw counter-clockwise.
- Verify Setting: After each adjustment, open a downstream faucet briefly to allow the system to stabilize, then close it and read the pressure gauge. Repeat adjustments until the desired pressure is achieved.
- Recommended Range: Maintain outlet pressure within the valve's specified range of 25-75 PSI.
Maintenance
Regular inspection and maintenance can prolong the life and ensure the proper function of your pressure reducing valve.
- Annual Inspection: Annually check the outlet pressure with a pressure gauge to ensure it remains at the desired setting.
- Leak Check: Periodically inspect the valve and connections for any signs of leaks.
- Cleaning: If the valve becomes sluggish or fails to maintain pressure, it may require cleaning or replacement of internal components. This should be performed by a qualified professional.
- Replacement: The typical lifespan of a pressure reducing valve can vary. Consider replacement if the valve consistently fails to hold pressure or if significant leaks develop.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No water flow or very low flow. |
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| High water pressure downstream. |
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| Fluctuating water pressure. |
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| Leaks at connections. |
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Specifications
| Feature | Detail |
|---|---|
| Model Number | LF25AUB-Z3 1/2 |
| Brand | Watts |
| Material | Bronze |
| Inlet/Outlet Connection Size | 1/2 inch (Threaded) |
| Pressure Range | 25 - 75 PSI |
| Factory Pressure Setting | 50 PSI |
| Maximum Operating Pressure | 75 PSI |
| Number of Ports | 2 |
| Item Dimensions (L x W x H) | 7 x 8.5 x 3.5 inches |
| Item Weight | 3.1 Pounds |
| Certifications | ASSE 1003, CSA B356, IAPMO |
| Lead Free | Yes |
Warranty and Support
For warranty information and technical support, please refer to the official Watts website or contact Watts customer service directly. The product includes a manufacturer's warranty. Keep your purchase receipt for warranty claims.
Watts Official Website: www.watts.com
