Watts 007 Series Operating instructions

Installation, Maintenance, and Repair Manual
Series 007, LF007
Double Check Valve Assemblies
1⁄2" – 3"
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, speci-
fications, or materials without prior notice and without incurring
any obligation to make such changes and modifications on Watts
products previously or subsequently sold.
RP-IS-007
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.
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.
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.
WARNING
!
Series 007 (½" to 2") and LF007 (½" to 3") are designed for installation
at referenced cross-connections to prevent the backflow of polluted
water into the potable water supply. Series LF007 Model IOT (2½" to
3" only) includes factory-installed pressure sensors.
LF007-NRS-IOT
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.
007M3QT
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 instal-
lations. See “Add-on Monitoring Connection Kits,” for ordering details.)

2
Installation Guidelines
Series 007 and LF007
1⁄2" – 2"
Indoors
Check local codes for installation requirements. Pipelines should be
thoroughly flushed to remove foreign material before installing the
unit. A strainer should be installed ahead of the backflow preventer,
as shown in Figure 1, to prevent the disc from unnecessary fouling.
Install the valve inline with the arrow on valve body pointing in the
direction of flow.
For indoor installations, the valve must be easily accessible to
facilitate testing and servicing. The assembly can also be installed
in a WattsBox insulated enclosure. (See Figure 2.) Do not install the
assembly in a concealed location.
CAUTION
!
Do not install a strainer when the backflow preventer is intended
for seldom-used water lines that are activated during emergencies,
such as fire sprinkler lines.
Series 007 and LF007 must be tested periodically in compliance
with local codes, but at least once a year or more often depending
upon system conditions. Regular inspection, testing, and cleaning
assure maximum life and proper product function.
NOTICE
Fire Protection System Installations. The National Fire
Protection Agency (NFPA) Guidelines require a confirming flow test
to be conducted whenever a “main line” valve such as a backflow
assembly or the shutoff valves have been operated. Certified testers
of backflow assemblies must conduct this test. The trim valves
of the detector meter bypass line, on assemblies so equipped,
should be shutoff during the confirming flow test. When the test is
completed, the trim valves must be returned to a fully open position.
Meter Box Installation
First
Shutoff Valve
Strainer
007QT-S / LF007QT-S
WattsBox Insulated
Enclosure
Available in Aluminum
or Fiberglass.
For more information,
download ES-WB.
First
Shutoff Valve
First Shutoff Valve
Figure 1
Figure 3
First Shutoff
Valve
007QT-S/LF007QT-S
Vertical flow-up installation
Strainer
007QT-S / LF007QT-S
Figure 2
Parallel
Two or more Series 007 and LF007 smaller size valves may be
piped in parallel (where approved) to serve a larger supply pipe main
as shown in Figure 3. 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. The
installation increases capacity where needed beyond that provided
by a single valve and permits testing or servicing of an individual
valve without shutting down the complete line.
For two valve installations the total capacity of the devices should
equal or exceed that required by the system.
The quantity of valves used in parallel should be determined by
the judgment of the compliance engineer, based on the operating
conditions of a specific installation.

3
Series 007 and LF007
1⁄2" – 2"
NOTICE
Before servicing, ensure supply water is turned off or shutoff
valvesare in the closed position. Open test cocks No. 2, No. 3,
and No. 4 to relieve pressure inside the valve prior to
removing valve cover.
1. Remove the cover, then remove the retainer from the body
valve. The check valve modules can now be removed from the
valve by hand or with a screwdriver.
Cover
Cover
O-ring
Retainer
Body
First Check Second Check
Seat
Seat
O-ring
Disc
Assembly
Spring
Check
Cage
Cover
Cover
O-ring
Retainer
Body
Second Check
First Check
O-rings Check
Cage
Spring
DiscSeat
NOTICE
For Series 007 and LF007, sizes 1⁄2" - 2", the seats and springs of
the first and second check modules are not interchangeable. The
heavier spring and smaller diameter seat belong with the first check
module. Series 007M1 sizes 3⁄4" - 1" and Series 007M2 3⁄4" have
interchangeable seats and springs.
2. 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 clockwise against the cage. For 3⁄4" Series
007M2/LF007M2 and LF007 pull apart seat and cage. The seat,
cage, spring and disc assembly are now individual components.
3. The disc assembly may now be cleaned and reassembled or,
depending on its condition, it may be discarded and replace with
a new assembly from the repair kit. O-rings should be cleaned or
replaced as necessary.
4. Reassemble the check valve module in the reverse order. 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. On the 3⁄4" - 1" size, this retainer may
have to be tilted slightly into place. Replace cover, and close
all test cocks before returning the valve to service.
Servicing the First and Second Check Valves

4
Strainer Series 77F-DI-FDA-125
WattsBox Insulated Enclosures
Available in Aluminum or Fiberglass.
For more information, refer to ES-WB at watts.com.
Figure 5
Figure 6
Meter
Strainer
Series 77F-DI-FDA-125
Figure 4
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.
Installation Guidelines
Series LF007
21⁄2" – 3"
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 as shown
in Figure 4, ahead of backflow preventer to prevent the disc from
unnecessary fouling. 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 emergen-
cies, 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.
NOTICE
Fire Protection System Installations
The National Fire Protection Agency (NFPA) Guidelines require a
confirming flow test to be conducted whenever a “main line” valve
such as the shutoff valves or a backflow assembly have been oper-
ated. Certified testers of backflow assemblies must conduct this
test. The trim valves of the detector meter bypass line, on assem-
blies so equipped, should be shutoff during the confirming flow test.
When the test is completed, the trim valves must be returned to a
fully open position.
Outside Building Above Ground
In an area where freezing conditions do not occur, Series LF007
can be installed outside of a building, as shown in Figure 5. 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, as shown
in Figure 6. 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 instal-
lations 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.)

5
Servicing the First and Second Check Valves
Seat Seat
O-ring
Disc
Assembly
Spring Retainer Caps/
Seat
Cover
Cover O-ring
Retainer
Body
First Check Second Check
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 re-
pair 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.
No special tools are required to service the assembly.
Check Assemblies
Troubleshooting
Series LF007
21⁄2" – 3"
SYMPTOM CAUSE SOLUTION
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

6
Add-on Monitoring Connection Kits
ORDERING CODE ADD-ON/REPLACEMENT KIT DESCRIPTION
88003067 BF-BMS-MCK
BMS Monitoring Connection Kit
Series LF007 Model IOT
Sizes 2½" to 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" to 3"
Includes three (3) replacement pressure sensor
modules for installation on test cocks No. 2, No. 3,
and No. 4.

7
Notes
_______________________________________________________________________________________________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________________________________________________________________________________________

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.
RP-IS-007 2304 1915216 © 2023 Watts
USA: T: [phone] • Watts.com
Canada: T: [phone] • Watts.ca
Latin America: T: (52) 55-4122-0138 • Watts.com