Xylem MM 615D User Manual

Series FS1
High Sensitivity
Liquid Flow Switch

INSTRUCTION MANUAL

MM-615D

SPECIFICATIONS

imum Liquid Pressure: 100 psi (7 kg/cm

Max

uid Temperature Range (T

Liq

Ambient Temperature Range (T

Electrical Enclosure Rating: N Type 1 (IP 21) (All models except “W”)

2 - 225˚F (0 - 107˚C)

): 3

L

2 - 120˚F (0 - 49˚C)

): 3

S

EMA

N MA Type 4X (IP 56) (“W” models)

E

2

)

Maximum Velocity: 10ft/sec (3M/sec)

Pipe Connection Thread Size:

E: Switch on ‘G’ models is rated for 750mA @ 24VAC and 24VDC. This

NOT

1

/2” N

PT (All models except “J”)

1

SPT (“J” models)

/2” B

switch should only be used on low voltage (24 VAC or less) or millivolt systems.

ELECTRICAL RATINGS

Mot

or Switch Rating (Amperes)

Voltage Full Load Locked Rotor Pilot Duty

120 VAC 7.4 44.4
240 VAC 3.7 22.2

125 VA at

120 or 240 VAC

50 or 60 cycles

2

FLOW RATES

Flow rates required to activate the flow switch
are shown in chart below.These values were

calculated using clean water in a horizontal pipe.

Flow Rates

Mode of Operation

Flow No Flow

Settings gpm (lpm) gpm (lpm)

Factory or

Minimum 0.41 (1.55) 0.24 (.91) 25
Maximum 1.81 (6.85) 1.28 (4.84) (95)

Values are ± 10%

NOTE: “L” models are set at the factory to prove flow at 1.7 gpm. The setpoint should not be adjusted in the
field without consulting factory.

Max. Flow Rate

gpm (lpm) w/o

Paddle Damage

Settings will vary when used to sense flow of other
fluids.

NOTE: THIS PRODUCT IS NOT INTENDED

FOR USE IN POTABLE WATER

APPLICATIONS.

NOTE: DO NOT USE LIQUID FLOW

SWITCHES ON SYSTEMS WITH
FLOW VELOCITY GREATER THAN
10 FEET (3M) PER SECOND.

PSI Flow Switch Capacity - FSI

DIFFERENTIAL

P 10 20 30 40 50 60 70 80 90

PRESSURE

GPM

CAPACITY

8.35 11.50 13.60 15.75 17.75 19.75 21.25 23 24.25

INSTALLATION –

STEP 1 - Determine the Location of the Flow Switch

• 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
flow 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.

1/2" PIPE

FLUID FLOW

5 x D

MINIMUM

D= PIPE DIAMETER

5 x D

MINIMUM

D

3

STEP 2

- Connecting the Flow Switch to Pipe

a. Apply pipe sealing compound or pe to the

PTFE ta

pipe threads.

NOTE: Do not apply sealant to first threads as this
switch is grounded (earthed) via the pipe mounting.

b. I

nsert pipe threads into flow switch 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.

- 31 ft•lb (42 N•m) for 1/2” pipe

PTFE

FLOW

• Repeat to connect pipe to opposite side of
flow switch.

4

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

!

a. Cover Removal and Installation Procedure

For FS1 models with NEMA 1 Enclosure

• 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).

For FS1-W models with NEMA 4X Enclosure

• Using flathead screwdriver, unscrew the six cover
screws and remove cover.

• Place the electrical connection cover on the flow
switch and insert the six cover screws. Tighten the
screws to a torque of 10 lb•in (1.13 N•m).

A

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.

5

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.

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.

NOTE: Do not adjust these screws.

Common

1

Common

(

HOT

LINE

FS4-3

31

2

FS4-3

31

2

(

Normally

(

Flow
Closes
Circuit

open

2

HOT

w

Flo
Opens
Circuit

3

Nor

mally

(

(

closed

(

LINE

LOAD

Fig. 1

6

Fig. 2

LOAD

SECTION 4 - Testing

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. 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.

ON

OFF

STEP 5 - Adjustment

Adjustment is necessary only if required flow/no
flow setpoints are above factory set minimum.

a. Turn off power.

b. Locate adjusting screw on bottom of unit.

c. Turn adjusting screw clockwise (1/8 turn) to

increase setpoint.

IMPORTANT: Do not attempt to lower flow switch
setpoint from original factory minimum setting.
Lowering (turning adjusting screw counterclock­wise) the setpoint from original factory setting
may cause erratic flow switch operation.

d. Turn on power.

e. Test the operation of the flow switch after

each adjustment.

Adjusting Screw

1/2" Pipe Connection

7

MAINTENANCE

TROUBLESHOO

TING

SCHEDULE:

• Inspect annually. Turbulent or high flow
velocity conditions may require more
frequent inspection and/or replacement.

• Replace flow switch every 5 years or 100,000
cycles, whichever occurs first.

Problem:

1. Flow Switch Does Not Operate
Solution:
a. Make sure power has been turned on to device

and flow switch.

b. Verify that flow rate is high enough for flow switch

tivate. Measure flow rate and match with

to ac
velocities shown in flow rate chart.

c. Flow switch may be located to sense flow in

polluted (scale, rust, sludge, etc.) water. Relocate
switch to a pipe that senses flow of non-polluted
water.

2. Flow Switch Operates Erratically

Solution:
a. Adjustment screw may have been turned below

r

iginal factory setpoint. Verify that flow rate is high

o

ough for flow switch to activate. Measure flow

en
rate and match with velocities shown in flow rate
chart.

b. Flow switch may be located to sense flow in

polluted (scale, rust, sludge, etc.) water. Relocate
switch to a pipe that senses flow of non-polluted
water.

3. Flow Switch Does Not Deactivate

Solution:

Me

asure flow rate and match with velocities shown

a.

in

flow rate chart. Flow switch must prove flow

before it can indicate no flow.

b. Flow switch may be located to sense flow in

polluted (scale, rust, sludge, etc.) water. Relocate
switch to a pipe that senses flow of non-polluted
water.

Xylem Inc.

8200 N.
Morton Grove, Illinois 60053
Phone: [phone]
Fax: [phone]
www.mcdonnellmiller.com

McDonnell & Miller is a trademark of

© 2014 Xylem Inc. MM-615D March 2014 Part No. 246717

Austin Avenue

Xylem Inc. or one of its subsidiaries.