Lockout Procedure

Lockout Procedure / Plant and process equipment

HVAC rooftop unit lockout procedure

A hVAC rooftop unit holds electrical, chemical and mechanical energy. Here is where it hurts people, and the procedure for yours: the placard for the machine and the written procedure for the binder.

E1C1M13 energy sources on a typical hVAC rooftop unit

Where a hVAC rooftop unit hurts people

  • Variable speed drives and run capacitors hold a charge after the disconnect opens.
  • Fans keep turning from the wind or the duct draft. Block the fan before reaching into the belt drive.
  • The thermostat calling for heat or cooling restarts the unit; that is why the disconnect is locked, not switched.

Write the procedure for your hVAC rooftop unit

List every source of energy that can move, power or hurt. The placard builds as you go, and the checks run on every change.

Who works on it

Energy sources

    Add a source

    Other plant machines

    Every machine · What makes a procedure machine-specific

    A lockout station board with rows of red safety padlocks, danger tags and breaker lockouts

    For the hVAC rooftop unit's lockout station

    The devices the placards call for. One lock per person, a tag on every lock.

    • SAFBY safety padlocks, keyed differently, 10 packOne lock per person, numbered, each opened only by its own key.
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    • TRADESAFE "Danger: Do not operate" tags, 30 packVinyl tags with ties, a line for the name, one on every lock.
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    • TRADESAFE adjustable ball valve lockout, 2 packCloses over a ball valve handle from 1/2 to 4-1/4 in pipe, for air, water and gas lines.
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    • Master Lock 421 group lockout haspSix locks on one isolation point, for a crew working on the same machine.
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    • Master Lock 1457E410KA lockout tagout kitA personal kit for one authorized employee: padlocks, hasps, tags and electrical lockouts in a pouch.
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