background image

RP/IS-LF909S-FS

LF909-QT-S-FS

NOTICE

Use of the integrated flood sensor does not replicate the need to 

comply with all required instructions, codes, and regulations related 

to installation, operation, and maintenance of this product, including 

the need to provide proper drainage in the event of a discharge.
Watts

®

 is not responsible for the failure of alerts due to connectivity or 

power issues.
 

NOTICE

The information contained herein is not intended to replace the full 

product installation and safety information available or the experience 

of a trained product installer. You are required to thoroughly read all 

installation instructions and product safety information before begin-

ning the installation of this product.
Inquire with governing authorities for local installation requirements.

Installation, Maintenance, and Repair Manual

Series LF909-FS Small

Reduced Pressure Zone Assemblies

3

4

" – 2"

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.

Testing

For field testing procedure, refer to 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 our Backflow 

Prevention Products Repair Kits & Service Parts price list PL-RP-

BPD at www.watts.com.
For technical assistance, contact your local Watts representative.

Series LF909-FS Small is equipped with an integrated flood sensor 

that, when activated, triggers notification of potential flood events 

from excessive relief valve discharges. An add-on connection is 

required to implement sensor activation. A retrofit sensor connection kit 

is available for existing installations. See “Add-on and Retrofit Sensor 

Connection Kits,” on the last page.

How It Operates

The unique relief valve construction 

incorporates two channels: one for 

air, the other for water. When the 

relief valve opens, the right channel 

admits air to the top of the reduced 

pressure zone, relieving the zone 

vacuum. The left channel then  

drains the zone to atmosphere. 

(See diagram to the right.) Therefore,  

if both check valves foul, and 

simultaneous negative supply and 

positive backpressure develops, the 

relief valve uses the air-in/water-out 

principle to stop potential backflow.

Reduced 

Pressure 

Zone

Water Out

Air In 

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 this information 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 ac-
cordance with local codes and ordinances.

WARNING

!

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.

 

NOTICE

For Australia and New Zealand, line strainers should be installed 

between the upstream shutoff valve and the inlet of the backflow 

preventer.

Содержание LF909-FS

Страница 1: ...ion A retrofit sensor connection kit is available for existing installations See Add on and Retrofit Sensor Connection Kits on the last page How It Operates The unique relief valve construction incorporates two channels one for air the other for water When the relief valve opens the right channel admits air to the top of the reduced pressure zone relieving the zone vacuum The left channel then dra...

Страница 2: ... or other equipment with periodic flow requirements discharge from the relief vent may occur due to water supply pressure fluctuation during static no flow conditions See Troubleshooting before installation Observe the direction of the flow arrows on the valve assembly The backflow preventer is designed so that the critical level of the relief valve is positioned below the first check This unique ...

Страница 3: ...ng A discharge line should be piped from the air gap at the relief valve connection making sure there is adequate drainage Never pipe the discharge line directly into a drainage ditch sewer or sump The assembly should never be installed where any part of the unit could become submerged in standing water Consideration should be given to the installation of external support structure as applicable I...

Страница 4: ...se needle valve A high red and open test cock No 2 2 Close test cock No 4 Disconnect the bypass hose yellow at test cock No 4 3 Open needle valves B low blue and C bypass yellow bleeding to atmosphere Then close needle valve B blue to restore the system to a normal static condition 4 Observe the pressure differential gauge If there is a decrease in the indicated value the No 1 check valve is repor...

Страница 5: ...is attached with a bayonet type locking arrangement 3 Holding the check valve module in both hands rotate the assembly quarter turn This disengages the disc assembly spring and seat cover into individual components 4 Clean and reassemble the disc assembly or depending upon its condition discard and replace it with a new assembly from the service kit O rings should be cleaned or replaced as necessa...

Страница 6: ...ver handy to reassemble the relief valve assembly Figure 2 Depress the assembly carefully guiding it against the 2 pound spring load When properly aligned the piston is in the cylinder bore Insert the screwdriver along the right channel wall positioning the screwdriver tip to the left of the relief valve O rings to hold the assembly in place Figure 3 Let go of the screwdriver and use both hands to...

Страница 7: ...ound the piping system and or electrically isolate the device with plastic pipe immediately upstream and down stream of the device Valve improperly reassembled If valve is dis as sem bled during installation exercise caution when reinstalling check springs in their proper location Valve exhibits high pressure drop Fouled strainer Clean strainer element or replace Valve too small for flows encounte...

Страница 8: ...ivation 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 working with a BMS controller not included 88003058 FP RFK BF BMS CFS 1 11 2 BMS Sensor Retrofit Connection Kit Series LF909 Small Sizes to 1 Includes flood sensor sensor activation module with cable mounting ...

Отзывы: