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McDonnell & Miller

Installation & Maintenance

Instructions

MM-625

FLOW

Series FS-250

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

Model FS254-NEMA4

Model FS251-NEMA1

1 2 3 4 5 6

Podsumowanie treści

Strona 1 - Liquid Flow Switch

McDonnell & MillerInstallation & Maintenance Instructions MM-625FLOWSeries FS-250General PurposeLiquid Flow SwitchOPERATIONThis control is an

Strona 2 - FLOW RATES

2NOTE: DO NOT USE LIQUID FLOW SWITCHES ON SYSTEMS WITHFLOW VELOCITY GREATER THAN 10 FEET (3M) PER SECOND.Maximum Liquid Pressure: 160 psi (11.3 kg/cm2

Strona 3 - Paddle Arm

3DFLUID FLOWD= PIPE DIAMETER1" PIPECONNECTION5 x DMINIMUM5 x DMINIMUMa. The flow switch must be installed in the pipe using a threaded tee connec

Strona 4

4BFLOWa. Cover Removal and Installation ProcedureFS251• Using a flathead screwdriver, loosen but do notremove the two cover screws and remove thecover

Strona 5 - N.C. C. N.O

5b. Electrical Conduit Connection• Connect electric conduit to flow switch electrical enclosure.• Follow accepted electrical practices when installing

Strona 6