WATTS LF007-NRS-IOT Double Check Valve Assemblies Instruction Manual

WATTS LF007-NRS-IOT Double Check Valve Assemblies

WARNING

Read this Manual BEFORE using this equipment. Failure to read and follow all safety and use information can result in death, serious personal injury, property damage, or damage to the equipment. Keep this Manual for future reference.

WARNING:
Local building or plumbing codes may require modifications to the information provided. You are required to consult the local building and plumbing codes prior to installation. If the information provided here is not consistent with local building or plumbing codes, the local codes should be followed. This product must be installed by a licensed contractor in accordance with local codes and ordinances.

WARNING
Need for Periodic Inspection/Maintenance: This product must be tested periodically in compliance with local codes, but at least once per year or more as service conditions warrant. All products must be retested once maintenance has been performed. Corrosive water conditions and/or unauthorized adjustments or repair could render the product ineffective for the service intended. Regular checking and cleaning of the product’s internal and external components helps assure maximum life and proper product function.

NOTICE

For Australia and New Zealand, line strainers should be installed between the upstream shutoff valve and the inlet of the backflow preventer. Watts® product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements, contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold. Series LF007 is designed for installation at referenced cross connections to prevent the backflow of polluted water into the potable water supply. Model IOT (available only with NRS gate valves) includes factory-installed pressure sensors on three test cocks (No. 2, No. 3, and No. 4).

NOTICE
For IOT models, an add-on monitoring connection kit is required to collect psi measurements from the integrated pressure sensors. Without the connection kit, the pressure sensors are passive components and will not communicate with any other device. For BMS only. (The connection kit and pressure sensors are also available for existing installations. See “Add-on Monitoring Connection Kits,” for ordering details.)

NOTICE
Use of integrated pressure sensors on and monitoring connection kit with IOT models does not remove the need to comply with all required instructions, codes, and regulations related to installation, operation, and maintenance of the backflow preventer. Watts is not responsible for data transmission failures due to power issues.

Testing
For field testing procedure, refer to the Watts installation sheets IS-TK-DL, IS-TK-9A, IS-TK-99E, and IS-TK-99D at www.watts.com.
For other repair kits and service parts, refer to the Backflow Prevention Products Repair Kits & Service Parts price list PL-RP-BPD at www.watts.com. For technical assistance, contact your local Watts representative.

Installation Guidelines

NOTICE: The flange gasket bolts for the gate valves should be retightened during installation as the bolts may have loosened due to storage and shipping.

Indoors
Series LF007 can be installed in either vertical or horizontal position. Always install the valve in an accessible location to facilitate testing and servicing. Do not install the unit in a concealed location. Pipelines should be thoroughly flushed to remove foreign material before installing the unit. A strainer should be installed ahead of backflow preventer to keep the disc from unnecessary fouling. (See Figure 1.) Install valve inline with arrow on valve body pointing in the direction of flow.

CAUTION
Do not install with a strainer when the backflow preventer is affixed to seldom-used water lines that are called upon during emergencies, such as fire sprinkler lines. Series LF007 must be tested periodically in compliance with local codes, but at least once a year or more often depending upon system conditions.

Outside Building Above Ground
In an area where freezing conditions do not occur, Series LF007 can be installed outside of a building. (See Figure 2.) The most satisfactory installation is above ground and should be installed in this manner whenever possible. In an area where freezing conditions can occur, Series LF007 should be installed above ground in an insulated enclosure. Annual inspection of all water system safety and control valves is required and necessary. Regular inspection, testing, and cleaning assures maximum life and proper product function.

Parallel
Consult local codes for approval of a parallel installation. (See Figure 3.) Two or more Series LF007 smaller size valves can be piped in parallel (where approved) to serve a larger supply pipe main. This type of installation is employed whenever it is vital to maintain a continuous supply of water or where interruptions for testing and servicing would be unacceptable. Other advantages include providing increased capacity where needed beyond that provided by a single valve and testing or servicing of an individual valve without shutting down the complete line. For two-valve installations the total capacity should equal or exceed that required by the system. The quantity of valves used in parallel should be determined by the engineer’s judgment based on the operating conditions of a specific installation. (Refer to F-FC regarding flow curves.)

Servicing the First and Second Check Valves

No special tools are required to service the assembly.

1. Remove cover bolts and cover.
2. Remove the retainer from the body bore. The check valve modules can now be removed from the valve by hand or with a screwdriver.
3. The check seats are attached to the cage with a bayonet type locking arrangement. Holding the cage in one hand, push the seat inward and rotate counterclockwise against the cage. The seat, spring cage, spring, and disc assembly are now individual components.
4. Clean and reassemble the disc assembly. Or depending on its condition, discard or replace with a new assembly from the repair kit. O-rings should be cleaned or replaced as necessary. For more information, refer to repair parts price list PL-RP-BPD.
5. Reassemble the check valve modules. Check modules are installed in the valve body with the seats facing the valve inlet. The modules must be securely in place before the retainer can be replaced.

Troubleshooting

Check valve fails to hold

1.0 PSID minimum

| Debris on check disc sealing surface| Disassemble and clean
Leaking gate valve| Disassemble and clean or repair
Damaged seat disc or seat O-ring| Disassemble and replace
Damaged guide holding check open| Disassemble and clean or replace
Weak or broken spring| Disassemble and replace spring
Chatter during flow conditions| Worn, damaged or defective guide| Disassemble and repair or replace guide
Low flows passing through mainline valve| Mainline check fouled| Disassemble and clean
Meter strainer plugged| Disassemble and clean
Damaged mainline seat disc or seat| Disassemble and replace
Broken mainline spring| Disassemble and replace

Add-on Monitoring Connection Kits

BMS Monitoring Connection Kit Series LF007 Model IOT

Sizes 2½” and 3″

| Includes a turnkey solution for transmitting valve assembly pressure measurements to a building management system; consists of an interface module with three (3) sensor cables, data cable, and power adapter.
88003068| RK-BF-Sensors Pressure Sensor Module Replacement Kit

Series LF007 Model IOT Sizes 2½” and 3″

| Includes three (3) replacement pressure sensor modules for installation on test cocks No. 2, No. 3, and No. 4.

Limited Warranty:

Watts Regulator Co. (the “Company”) warrants each product to be free from defects in material and workmanship under normal usage for a period of one year from the date of original shipment. In the event of such defects within the warranty period, the Company will, at its option, replace or recondition the product without charge.

THE WARRANTY SET FORTH HEREIN IS GIVEN EXPRESSLY AND IS THE ONLY WARRANTY GIVEN BY THE COMPANY WITH RESPECT TO THE PRODUCT. THE COMPANY MAKES NO OTHER WARRANTIES, EXPRESS OR IMPLIED. THE COMPANY HEREBY SPECIFICALLY DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

The remedy described in the first paragraph of this warranty shall constitute the sole and exclusive remedy for breach of warranty, and the Company shall not be responsible for any incidental, special or consequential damages, including without limitation, lost profits or the cost of repairing or replacing other property which is damaged if this product does not work properly, other costs resulting from labor charges, delays, vandalism, negligence, fouling caused by foreign material, damage from adverse water conditions, chemical, or any other circumstances over which the Company has no control. This warranty shall be invalidated by any abuse, misuse, misapplication, improper installation or improper maintenance or alteration of the product. Some States do not allow limitations on how long an implied warranty lasts, and some States do not allow the exclusion or limitation of incidental or consequential damages. Therefore the above limitations may not apply to you. This Limited Warranty gives you specific legal rights, and you may have other rights that vary from State to State. You should consult applicable state laws to determine your rights. SO FAR AS IS CONSISTENT WITH APPLICABLE STATE LAW, ANY IMPLIED WARRANTIES THAT MAY NOT BE DISCLAIMED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO ONE YEAR FROM THE DATE OF ORIGINAL SHIPMENT

USA: T:978-689-6066 • Watts.com
Canada: T:888-208-8927 • Watts.ca
Latin America: T: (52) 55-4122-0138 •Watts.com

References

• Watts | Plumbing, Heating and Water Quality Solutions
• Watts | Plumbing, Heating and Water Quality Solutions

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