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Series FS8-W
General Purpose
Liquid Flow Switch

OPERATION

This control is an independently mounted water flow
sensing device that makes or breaks an electrical
circuit when flow stops or starts.

• 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.

WARNING

CAUTION

!

WARNING

Series FS8-W

Now
with
Stainless Steel
Paddles

McDonnell & Miller

Installation & Maintenance 

Instructions 
MM-600(G)

Summary of Contents for McDonnell & Miller FS8-W Series

Page 1: ...cable 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...

Page 2: ...65 an anticipated system switch operation rate of less than once per 2 5 minutes and any one cycle greater than 3 seconds on and 3 seconds off For applications with loads 0 5 and 38mA power factors e...

Page 3: ...1 38 398 Factory or 21 2 65 Minimum 17 9 67 8 1 20 36 12 1 45 8 81 25 149 Maximum 71 3 270 4 78 1 46 59 2 224 3 97 1 21 565 Factory or 3 80 Minimum 24 2 91 6 1 05 32 16 4 62 1 71 22 230 Maximum 89 337...

Page 4: ...nt Adjustment 2 50 118 5 99 5 3 80 278 0 227 0 4 100 442 0 391 0 5 125 847 0 762 0 6 150 1440 0 1325 0 Series FS8 W K Factor b If the flow rate in the pipe exceeds the maximum adjustment on the Flow S...

Page 5: ...irection 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 must be installed in the pump suction piping...

Page 6: ...cution 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 wa...

Page 7: ...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...

Page 8: ...low switch to activate Measure flow rate and match with velocities shown in flow rate chart c Check to see if paddle moves freely Some system piping disassembly may be required 3 Flow Switch Does Not...

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