Practice question

A binary (or trinary) pressure switch on an R-134a system commonly protects against:

  1. Only low oil level
  2. Both excessively low and excessively high system pressure (and may also command the condenser fan)
  3. Blower over-speed
  4. Excess cabin humidity

Answer: B — Both excessively low and excessively high system pressure (and may also command the condenser fan)

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