hydronics

Meter Safety Reminders

Electrical meters are so commonly used by service technicians that most take them for granted. Rarely are meters considered a source of potential danger. But the electrical meter, being as versatile and easy to use as it is, can very easily become the path of current between the power supply and the technician! In most …

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Ladder Diagram Locators

  Take a look at the lower portion of this wiring diagram and locate the relay coils “IFR” and “CI” on lines 52 and 57. In the detail shown in red letters, note that there are small numbers along the right-hand side of the diagram as well. These numbers designate the line location of relay contacts. The number 33 …

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