FEBCO LF860-FS Large Installation Guide

: June 8, 2024
: FEBCO

Table of Contents

Series LF860-FS Large and LF866-FS
Installation Guidelines
Service and Maintenance
- Check Valve Disassembly
- Relief Valve Disassembly
Troubleshooting
Limited Warranty
Customer Support
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

FEBCO LF860-FS Large

Series LF860-FS Large and LF866-FS

LF860-FS-OSY
LF866-FS-OSY-GPM

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

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. If installed on a fire suppression system, all mechanical checks, such as alarms and backflow preventers, should be flow tested and inspected in accordance with NFPA 13 and/or NFPA 25. 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 components helps assure maximum life and proper product function.

WARNING

The installation and maintenance of backflow assemblies should be performed by a qualified, licensed technician. Failure to do so may result in a malfunctioning assembly.

Master Series LF860-FS Large and LF866-FS are each equipped with an integrated flood sensor that detects excessive relief valve discharges and triggers notification of potential flood events. An add-on sensor connection kit activates the alert system for use with building management systems or cellular communication networks. A retrofit sensor connection kit is available for existing installations. See “Add-on and Retrofit Sensor Connection Kits,” at the end of this document for qualifying series and valve sizes.

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.

Consult local codes for specific installation requirements and restrictions applicable to your area. At least 20 psi (133 kPa) is recommended for system supply pressure.
Install the valves only in the orientation or flow direction shown. These instructions apply only to Series LF860-FS and LF866-FS, sizes 2½” to 10″.
Install the valve assembly where it is accessible for periodic testing and maintenance. Clearances shown in the installation views apply to interior, and pit or vault installations and are only recommendations. (See Figures 1 and 2.) These minimums do not apply to removable protective enclosures. Refer to local codes for actual requirements of the area.
Before installing the valve into the line, flush the supply line of all foreign materials. Failure to flush the supply line can cause the check valves to become fouled and require disassembly and cleaning.
Do not lift the assembly by connecting to the gate valve handwheels or stems.
After installation, slowly fill the assembly with water and bleed air from the body using test cocks No. 2, No. 3, and No. 4. Test the valve assembly to ensure correct operation.

NOTICE
All assemblies are tested at the factory for proper operation and leakage. If the valve does not pass the field test, it is most likely due to a fouled check valve. This is not covered by the factory warranty. The valve cover(s) must be removed and the check seats inspected and cleaned. Any damage or improper operation caused by pipeline debris or improper installation/start-up is not included in the factory warranty. In case of a possible warranty claim, contact the local supplier or FEBCO representative. Do not remove the valve assembly from the pipeline.
Protect the assembly from freezing and excessive pressure increases. Pressure increases can be caused by thermal expansion or water hammer. These excessive pressure situations must be eliminated to protect the valve and system from possible damage.

NOTICE

The gap drain is not designed to catch the maximum discharge possible from the relief valve. The installation of a FEBCO® air gap with the drain line terminating above a floor drain handles any normal discharge or nuisance spitting through the relief valve. However, floor drain size may need to be designed to prevent water damage caused by a complete failure condition. Do not reduce the size of the drain line from the air gap fitting.
When installing an air gap, attach the air gap brackets directly onto the flood sensor.

Service and Maintenance

Rinse all parts with clean water before reassembly.
Do not use any pipe dope, oil, grease, or solvent on any parts unless instructed to do so.
Do not force parts. Parts should fit together freely. Excess force can cause damage and render the assembly inoperable.
Carefully inspect seals and seating surfaces for debris or damage.
After servicing, repressurize the assembly and test to ensure proper operation.
For more information on maintenance, check with your FEBCO representative or go to FEBCOonline.com.

Check Valve Disassembly

Close the outlet shutoff valve, then close the inlet shutoff valve. Bleed residual pressure from the assembly by opening test cocks No. 4, No. 3, and No. 2 in this sequence.
Remove the cover nuts and bolts and lift the cover from the body. The springs are retained and the cover should be pushed away from the body approximately 1/4 inch.
Inspect the parts and debris from the disc and seat ring. Replace worn or damaged parts as required.
Replace the cover, making sure the spring assembly is positioned in the pivot socket. If necessary, apply FDA Approved grease to the O-ring groove in the body to keep the O-ring in position while installing the cover.
Install the bolts and nuts and tighten.

Relief Valve Disassembly

Detach the activation module, if installed, from the flood sensor.
Use two 1/2″ wrenches to remove the sensor from the relief valve.
Remove the cap screws holding the cover to the relief valve body, and remove the cover.
Remove the diaphragm and pull the internal assembly from the body. If helpful, push the internal assembly with fingers through the discharge opening.
Inspect for debris, damage, or fouling of the seat disc. Clean or replace parts as required.
Reassemble in the reverse order of disassembly.

Test Procedure for Reduced Pressure Assemblies
Check the ASSE Series 5000 manual for an appropriate test method that is consistent with local codes of the area.

Troubleshooting

PROBLEM	CAUSE	SOLUTION
Continuous relief valve discharge	Debris on check seating surfaces

Disassemble and clean
Debris on relief valve surfaces
Intermittent relief valve discharge| Inlet pressure fluctuations| Eliminate fluctuations
Downstream pressure surges| Eliminate surges
Low flows passing through mainline valve (RPDA)| Mainline check fouled| Disassemble and clean

Add-on and Retrofit Sensor Connection Kits for Building Management Systems

PART NUMBER	ADD-ON/RETROFIT KIT	DESCRIPTION
88009414		FP-FBF-BMS-21/2-10

BMS Sensor Connection Kit
Series LF860-FS Large, LF866-FS, LF880V-FS, LF886V-FS
Sizes 2½” to 10″| Includes sensor activation module with cable, ground wire, and power adapter. Use this kit to activate the integrated flood sensor and enable flood detection capabilities on the relief valve of a new installation linked to a BMS controller (not included).
88009415| | FP-RFK-FBF-BMS-CFS-21/2-10
BMS Sensor Retrofit Connection Kit
Series LF860 Large, LF866, LF880V, LF886V
Sizes 2½” to 10″| Includes flood sensor with mounting hardware, sensor activation module with cable, ground wire, and power adapter. Use this kit to install the flood sensor and enable flood detection capabilities on the relief valve of an existing installation linked to a BMS controller (not included).

Add-on and Retrofit Sensor Connection Kits for Cellular Communication

PART NUMBER	ADD-ON/RETROFIT KIT	DESCRIPTION
88009416		FP-FBF-CFS-21/2-10

Cellular Sensor Connection Kit
Series LF860-FS Large, LF866-FS, LF880V-FS, LF886V-FS
Sizes 2½” to 10″| Includes sensor activation module with cable, Cellular Gateway with mounting kit, ground wire, and power adapter. Use this kit to activate the integrated flood sensor and enable flood detection capabilities on the relief valve of a new installation linked to a cellular network to send alerts by email message, SMS text message, or voice call.
88009417| | FP-RFK-FBF-CFS-21/2-10
Cellular Sensor Retrofit Connection Kit
Series LF860 Large, LF866, LF880V, LF886V
Sizes 2½” to 10″| Includes flood sensor with mounting hardware, sensor activation module with cable, Cellular Gateway with mounting kit, ground wire, and power adapter. Use this kit to install the flood sensor and enable flood detection capabilities on the relief valve of an existing installation linked to a cellular network to send alerts by email message, SMS text message, or voice call.

Limited Warranty

Limited Warranty: FEBCO (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.