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5

A

a. Cover Removal and Installation Procedure

For FS6 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 FS6-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).

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.

Summary of Contents for McDonnell & Miller FS-6 Series

Page 1: ...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 i...

Page 2: ...ectronic has Type 1C action micro interruption on operation LVD 73 23 EEC EMC 89 33 EEC For applications with loads between 38mA and 3 7 Amps power factors exceeding 0 65 an anticipated system switch...

Page 3: ...1 Determine the Location of the Flow Switch 5 x D MINIMUM 5 x D MINIMUM D PIPE DIAMETER 3 4 or 1 PIPE D The flow switch should be located in a horizontal section of pipe where there is a straight hori...

Page 4: ...low 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...

Page 5: ...trical 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 h...

Page 6: ...itch 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...

Page 7: ...FLOW Adjustment Lever Screw Flow No Flow 0 12 0 06 Flow No Flow The Flow Rates Shown Are Averages May Vary 10 2 5 1 5 MAXIMUM ADJUSTMENT MINIMUM ADJUSTMENT Adjustment is necessary only if required flo...

Page 8: ...tically Solution a Adjustment screw may have been turned below original factory setpoint Verify that flow rate is high enough for flow switch to activate Measure flow rate and match with velocities sh...

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