Xylem McDonnell & Miller FS4-3T Series User manual

INSTRUCTION MANUAL
Series FS4-3T
General Purpose
Liquid Flow Switch
• Before using product, read and understand instructions.
• Save these instructions for future reference.
• All work must be performed by qualified personnel trained in the proper application,
installation, and maintenance of plumbing, steam and electrical equipment and/or systems in
accordance with all applicable codes and ordinances.
• To prevent 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.
California Proposition 65 warning! This product contains chemicals known to the
•state of California to cause cancer and birth defects or other reproductive harm.
Previous controls should never be installed on a new system. Always install new
•controls on a new boiler or system.
CAUTION:
A more frequent replacement interval may be necessary based on the condition of
the unit at time of inspection. McDonnell & Miller's warranty is one (1) year from date
of installation or two (2) years from the date of manufacture.
MM-613E
•
• Liquid m edia containing deb ris or other particulates should b e filtered to avoid dam age
to or ob struction of the flow switch paddle arm assem b ly, which could cause the flow
Switch to m alfunction.

2
Maximum Liquid Pressure: 160 psi (11.3 kg/cm2)
Liquid Temperature Range (TL): 32 - 300°F (0 - 149°C)
Ambient Temperature Range (TS): 32 - 120°F (0 - 49°C)
Electrical Enclosure Rating: NEMA Type 1 (IP 21)
Maximum Velocity: 10ft/sec (3M/sec)
Pipe Connection Thread Size: 3/4”or 1” NPT
Models that meet CE Conformance:
FS4-3T3-3/4-E
FS4-3T3-1-E
• This Control: is for continuous operations
is not electronic
has Type 1C action (micro interruption
on operation)
• LVD 73/23/EEC
• EMC 89/33/EEC
For applications with loads between 14mA and 3.7
Amps, power factors exceeding 0.65, an anticipated
system switch operation rate of less than 5 times
per minute, and any one cycle greater than 3 sec-
onds on and 3 seconds off.
Additional suppression may be required for applica-
tions outside these ranges.
• Declaration of Conformity
Available on request.
SPECIFICATIONS
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
ELECTRICAL RATINGS
CE Circuit Rating
7.4 (7.4)/120~ 0.3/120=
3.7 (3.7)/240~ 0.15/240=

FLOW RATES
Settings will vary when used to sense flow of other
fluids.
3
NOTE: DO NOT USE LIQUID FLOW SWITCHES ON SYSTEMS
WITH FLOW VELOCITY GREATER THAN 10 FEET (3M)
PER SECOND.
Values are ± 10%
Flow Rates
Pipe Mode of Operation
Model Size NPT Flow No Flow
Number in. (mm) Settings gpm (lpm) gpm (lpm)
Factory or
FS4-3T1-
3⁄43⁄4
(20) Minimum 4.4 (16.7) 2.6 (9.8)
Maximum 10.5 (39.7) 9.8 (37.1)
Factory or
FS4-3T2-
3⁄43⁄4
(20) Minimum 3.7 (14) 2.2 (8.3) 16.62
Maximum 8.9 (33.7) 8.3 (31.4) (63)
Factory or
FS4-3T3-
3⁄43⁄4
(20) Minimum 2 (7.6) 1.2 (4.5)
Maximum 4.5 (17) 4.1 (15.5)
Factory or
FS4-3T1-1 1 (25) Minimum 5 (18.9) 3.2 (12.1)
Maximum 11.5 (43.5) 11 (41.6)
Factory or
FS4-3T2-1 1 (25) Minimum 4.8 (18.1) 2.9 (11) 27
Maximum 10.1 (38.2) 9.4 (35.6) (102)
Factory or
FS4-3T3-1 1 (25) Minimum 2 (7.6) 1.2 (4.5)
Maximum 4.5 (17) 4.1 (15.5)
Max. Flow
Rate gpm
(lpm) w/o
Paddle Damage
calculated using clean water in a horizontal pipe.
Flow rates required to activate the flow switch
are shown in chart below.These values were
NOTE: THIS PRODUCT IS NOT INTENDED FOR USE IN
POTABLE WATER APPLICATIONS.

4
INSTALLATION –
STEP 1 - Determine the Location of the Flow Switch
D
FLOW
3/4" or 1"
PIPE
5 x D
MINIMUM
5 x D
MINIMUM
D= PIPE DIAMETER
• 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 may be installed in a vertical
pipe if the flow is in the upward direction.
• 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 flo w.
• Some system conditions that require more than 5 pipe
diameters are high viscosity fluid and high fluid v elocity.
• The flow switch should be installed in the pump suction
piping when spring-loaded check valves and/or other
closed coupled accessories are installed in the pump
discharge piping.
STEP 2 - Connecting the Flow Switch to Pipe
a. Apply pipe sealing compound or PTFE tape to the
NOTE: Do not apply sealant to first threads as this
switch is grounded (earthed) via the pipe mounting.
FLOW
b. Insert pipe threads into flow switch and turn 2
or 3 times until tight.
•Place one pipe wrench on base of flo w
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.
PTFE
pipe threads.

5
A
a. Cover Removal 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 screw-
driver, tighten the cover screws to a torque of 10 lb•in
(1.13 N•m).
STEP 3 - Electrical Installation
• To prevent 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 electric 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 “No-
Flow”) 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.
FLOW
OPENS
CIRCUIT
FLOW
CLOSES
CIRCUIT
COMMON
1
2
3
Flow
Opens
Circuit
Normally
closed
3
Common
1
Flow
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 for 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 power. Initiate fluid
flow through the system. Observe the device being
activated by the flow switch to determine if device is
operating as required.
b. Tu rn 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 ser vice.
-If not operating as required, flow switch may need
to be adjusted.
OFF
ON
STEP 4 - Testing
SECTION 5 - Adjustment
ADJUSTING SCREW
FLOW
OPENS
CIRCUIT
FLOW
CLOSES
CIRCUIT
COMMON
1
2
3
Adjustment is necessary only if required flow/no
flow setpoints are above factory set minimum.
a. Tu rn off power. Remove electric enclosure
cover.
b. Tu rn adjusting screw clockwise (1/8 turn) to
increase setpoint.
c. Place the cover on the flow switch and turn on
power.
d. Test the operation of the flow switch after
each adjustment.
IMPORTANT: Do not attempt to lower flow switch
setpoint from original factory minimum setting.
Lowering (turning adjusting screw counterclock-
wise) the setpoint from original factory setting
may cause erratic flow switch operation.

Xylem Inc.
8200 N. Austin Avenue
Morton Grove, Illinois 60053
Phone: [phone]
Fax: [phone]
www.xyleminc.com/brands/mcdonnellmiller
McDonnell & Miller is a trademark of Xylem Inc. or one of its subsidiaries.
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