Series FS-5
®
General Purpose
Liquid Flow Switch
INSTRUCTION MANUAL
MM-616)
2
Motor Switch Rating (Amperes)
Voltage Full Load Locked Rotor Pilot Duty
120 VAC
7.4 44.4
125 VA at
240 VAC 3.7 22.2
120 or 240 VAC
50 or 60 cycles
Maximum Liquid Pressure: 150 psi (10.5 kg/cm2)
Liquid Temperature Range (T
L
): 32 - 250˚F (0 - 121˚C)
(All models except “S”)
32 - 225˚F (0 - 107˚C)
(“S” models)
Ambient Temperature Range (TS): 32 - 120˚F (0 - 49˚C)
Electr
ical Enclosure Rating: NEMA Type 1 (IP 21)
Maximum Velocity: 10ft/sec (3M/sec)
Pipe Connection Thread Size:
3
/4”
or 1”
NPT
(All models e
xcept
“J”)
3
/4” or 1” BSPT
(“J” models)
SPECIFICATIONS
ELECTRICAL RATINGS
FLOW RATES
Settings will vary when used to sense flow of other
fluids.
3
NOTE: DO NOT USE LIQUID FLO
W
SWITCHES ON SYSTEMS WITH
FLOW VELOCITY GREATER THAN
10 FEET (3M) PER SECOND.
INSTALLATION –
STEP 1 - Determine the Location of the Flow Switch
Fluid Flow
3/4" or 1"
PIPE
5 x D
MINIMUM
D
D= PIPE DIAMETER
5 x D
MINIMUM
• The flow switch
should be located in a horizontal
section of pipe
where there is a straight horizontal run
of at least 5 pipe diameters on each side of the flo
w
switch.
• The flow switch
must be installed in the upright
position
as shown with arrow mark on side of casting
in the same direction as fluid will flow.
• Some system conditions that require more than 5 pipe
diameters are high viscosity fluid and high fluid velocity.
• The flow switch should be installed in the pump suction
piping when spring-loaded check valves and/or other
close coupled accessories are installed in the pump
discharge piping.
Flow Rates
Pipe
Mode of Operation
Size NPT
Flow
No Flow
in. (mm) Settings gpm (lpm) gpm (lpm)
3
⁄4
(20)
Factor
y or
or Minimum 1.5 (5.7) 1.1
(4.2) 16.62 (63)
1 (25)
Maximum 15 (56.8) 10 (37.9) 27 (102)
Values are ± 10%
Max. Flow
Rate gpm
(lpm) w/o
Paddle Damage
Flow rates required to activate the flow switch
are shown in chart below.These values were
calculated using clean water in a horizontal pipe.
NOTE: THIS PRODUCT IS NOT INTENDED
FOR USE IN POTABLE WATER
APPLICATIONS.
4
SECTION 2 - Connecting the Flow Switch to Pipe
b. Insert pipe threads into flow s
witch and turn 2
or 3 times until tight.
• Place one pipe wrench on hex fitting of flow
switch and one wrench on connecting piping.
Tighten to following torque values.
- 47 ft•lb (64 N•m) for 3/4” pipe
- 63 ft•lb (85 N•m) for 1” pipe
• Repeat to connect pipe to opposite side of
flow switch.
a. Apply pipe sealing compound or PTFE tape to the
pipe threads.
NOTE: Do not apply sealant to first threads as this
switch is grounded (earthed) via the pipe mounting.
PTFE
5
A
a. Cover Remo
val and Installation Procedure
• Using a flathead screwdriver, loosen but do not remove
the two cover screws and remove the cover (A).
• Place the cover on the flow switch sliding the slots
behind the two loose cover screws. Push the cover
down into the flow switch and using a flat blade screwdriver, tighten the cover screws to a torque of 10 lb•in
(1.13 N•m).
STEP 3 - Electrical Installation
• To pre
vent electrical shock, turn off the electrical power before making electrical connections.
• To prevent an electrical fire or equipment damage, electrical wiring insulation must have a rating of
167˚F (75˚C) if the liquid’s temperature exceeds 180˚F (82˚C).
• To prevent electrocution, when the electrical power is connected to the flow switch, do not touch the
terminals.
• Make sure flow switch electrical cover is secured before turning on electric power.
Failure to follow this warning could cause property damage, personal injury or death.
!
WARNING
b. Electrical Conduit Connection
• Connect electr
ic conduit to flow switch electrical enclosure.
• Follow accepted electrical practices when installing fittings
and making connections.
• Refer to and follow local codes and standards when
selecting the types of electrical fittings and conduit to
connect to flow switch.
6
d. Based upon the mode of operation (“Flow”
or “NoFlow”) required, complete the appropriate steps to
connect wires to flow switch. Use a Phillip’s head
screwdriver to loosen and tighten switch terminal
screws when attaching wires.
For “Flow” Mode of Operation (Fig. 1)
If the flow switch will be used to actuate a signal,
alarm or other device when
flow
occurs, connect
the wire from that device to the
“N.O.” contact.
Connect the “Hot” power supply wire to “C” terminal.
For “No Flow” Mode of Operation (Fig. 2)
If the flow switch will be used to actuate a signal,
alarm or other device when
no flow
occurs, connect
the wire from that device to the
“N.C.” contact.
Connect the “Hot” power supply wire to “C” terminal.
NOTE: Repeat above to connect wires to second
switch on “D” model flow switches.
Flow
Opens
Circuit
Normally
closed
3
Common
1
Flo
w
Closes
Circuit
2
(
(
Normally
open
(
(
Common
(
(
FS4-3
LINE
LOAD
Fig. 1
HOT
31
2
FS4-3
LINE
LOAD
Fig. 2
HOT
31
2
c. Determine which switch action is required f
or the
flow switch.
• “Flow” means that the switch will close circuit
C.-N.O. and open circuit C.-N.C. when flow rate
is increased above setpoint of flow switch.
• “No Flow” means that the switch will open circuit
C.-N.O. and close circuit C.-N.C. when flow rate
is decreased below setpoint of flow switch.
7
a. Place cover on flow switch and turn on po
wer. Initiate
fluid flow through the system. Observe the device being
activated by the flow switch to determine if device is
operating as required.
b. Turn off fluid flow to determine if device is operating
as required.
c. Repeat initiating and turning off fluid flow several times to
test flow switch and device for proper operation.
- If operating as required, put system into service.
- If not operating as required, flow switch may need
to be adjusted.
OFF
ON
STEP 4 - Testing
STEP 5 - Adjustment
Adjustment is necessary only if required flow/no
flow setpoints are above f
actory set minimum.
a. Turn off power. Remove electric enclosure
cover.
b. Turn adjusting screw FRXQWHUclockwise (1/8 turn)
to increase setpoint.
IMPORTANT: Do not attempt to lower flow switch
setpoint from original factory minimum setting.
Lowering (turning adjusting screw clockwise)
the setpoint from original factory setting
may cause erratic flow switch operation.
c. Place the cover on the flow switch and turn on
power.
d. Test the operation of the flow switch after
each adjustment.
Xylem Inc.
8200 N. Austin Avenue
Morton Grove, Illinois 60053
Phone: (847) 966-3700
Fax: (847) 965-8379
www.mcdonnellmiller.com
McDonnell & Miller is a trademark of Xylem Inc. or one of its subsidiaries.
© 2014 Xylem Inc. MM-616F May 2014 Part No. 246716
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