Practice question

A bus uses a clutch-cycling orifice-tube (CCOT) system. The compressor clutch cycling is controlled to:

  1. Drive the blower
  2. Open the receiver-drier
  3. Maintain refrigerant charge
  4. Prevent evaporator freeze-up by cycling the compressor on evaporator pressure/temperature

Answer: D — Prevent evaporator freeze-up by cycling the compressor on evaporator pressure/temperature

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Practice more: ASE S7 Air Conditioning Systems & Controls (School Bus) Practice Questions - ASE S7 - Air Conditioning Systems & Controls (School Bus) Certification Exam →