Watts LFN45B-EZ-M1 Series Installation Instructions

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.
Installation Instructions
1. The valve should be installed by a licensed contractor in accordance with local
codes and ordinances.
2. This valve should be installed where it is accessible with sufficient clearance
for cleaning, service, or adjustment.
3. Before installing the valve, be sure that the pipe ends are reamed and threads
are cut to size.
4. Flush the lines to remove all loose scale, dirt and other foreign matter that
can damage or clog the valve.
5. Install the regulator with the arrow on the body pointing in the direction of the flow.
6. Regulator may be installed vertically or horizontally (upright or inverted).
7. Start Up — Open cold water supply then hot water supply. Inspect for leaks.
NOTICE
The valve should be inspected annually to assure maximum
life and performance.
NOTICE
LFN45B-EZ-M1 – This valve is not suitable for outdoor or PIT installations.
Maintenance Instructions
WARNING
!
Depressurize valve before servicing.
• To clean strainer or replace seat/stem module shut off supply, note indicator
setting, loosen knob retaining screw and back off knob.
• Remove Spring Cage, Spring, Washer and Slip Ring. Grasp Stem Nut with
fingers or pliers and lift module from body.
• Replace module and reassemble valve.
• Readjust pressure setting.
Adjustment
Regulator is factory preset to 50psi (345kPa). To adjust pressure setting, loosen
the knob retaining screw and turn the adjusting knob clockwise to increase
pressure, counter clockwise to decrease pressure.
CAUTION
!
Any time a reducing valve is adjusted, the use of a pressure gauge is recommended
to verify correct pressure setting.
Bypass Feature
This regulator has a built-in thermal expansion bypass feature. This feature pre-
vents downstream pressure from rising to more than 10psi (69kPa) above the sup-
ply pressure.
NOTICE
The bypass feature will not prevent the pressure relief valve from opening on the
hot water supply system with pressure above 150psi (10.3 bar).
Seat/Stem Module
Stem Nut
Strainer
Repair Kits
KIT NO. SIZE ORDERING
in. mm CODE
1 ⁄ – 1 1 ⁄ , 3 ⁄ , 1 15, 20, 25 0006960
2 2 4
N45B/N45B-EZ-RK
Typical Installation
WATTS
PRESSURE GAUGE
(2 PLACES)
WATER
METER
WATTS
SUPPLY WATTS
SHUTOFF VALVE BACKFLOW
(2 PLACES) PREVENTER
Series Installation
Series installations are recommended where very high supply
Knob Retaining
pressure must be reduced to a very low downstream pressure.
Screw
Reducing the pressure in stages eliminates whistling and noise.
Adjusting Knob
Indicator/
WATTS
Spring Washer
PRESSURE GAUGE
(2 PLACES)
Spring
WATER
Spring Cage
METER
WATTS
SUPPLY WATTS
SHUTOFF VALVE BACKFLOW
Stem Nut
(2 PLACES) PREVENTER
Slip Ring Parallel Installation
Parallel installations are recommended where high flow or low flow
Seat/Stem
demand is intermittent/occasional. They are also used for installa-
Module
tions where service cannot be interrupted.
Strainer
WATTS
PRESSURE GAUGE
(2 PLACES)
WATER
METER
SUPPLY WATTS WATTS
SHUTOFF VALVE BACKFLOW
KIT
(2 PLACES) PREVENTER
INCLUDES
Seat/Stem
Module
Troubleshooting
High System Pressure
If the downstream system pressure is higher than the set pressure under no
flow conditions, the cause could be thermal expansion, pressure creep or dirt/
debris on the seat.
Thermal expansion occurs whenever water is heated in a closed system. The
TO FIXTURES
WATTS system is closed when supply pressure exceeds 150psi (10.3 bar), or a check
PRESSURE
REGULATOR valve or backflow preventer is installed in the supply piping.
You must make provisions for pressure relief protection of your
plumbing system and components. The use of a relief valve
such as the Watts 530C, BRV, Governor 80, or 3L or potable
water expansion tank such as the Watts DET, PLT or DETA may
be required.
To determine if this is the result of thermal expansion, try
briefly opening the cold water tap. If the increased pres-
sure is caused by thermal expansion, the pressure will
immediately be relieved and the system will return to the
set pressure. Watts offers a pressure test gauge, model
276H300 to assist you in determining if you have high
water pressure. The 276H300 when attached to a hose
bibb registers the highest pressure reading over the
WATTS TO FIXTURES
PRESSURE
Watts 276H300 period of time it is left on the system.
REGULATOR
(2 PLACES)
! WARNING
WATTS TO FIXTURES
PRESSURE For valves with CPVC or PEX end connections do not exceed the
REGULATOR
tubing manufacturers pressure and temperature ratings. Refer to
(2 PLACES)
the tubing manufacturers product specifications for that informa-
tion.