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Quality Assurance Flashcards

7 cards from real ASHRAE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Quality Assurance flashcards as text

  1. What is the main purpose of pre-functional (construction) checklists?

    Answer: To confirm equipment is installed correctly and ready for startup before functional testing

    Construction checklists confirm installation, wiring and startup items so functional tests are not wasted on incomplete work.

  2. A functional performance test of an air handler should verify:

    Answer: Operation through all modes and control sequences, including failure modes

    Functional tests show that the system follows its sequences in every operating mode, alarm and failsafe condition.

  3. What is the most reliable way to check a space temperature sensor's calibration?

    Answer: Compare it with a calibrated reference instrument traceable to NIST

    Calibration checks need a reference instrument whose accuracy is traceable to a national standard such as NIST.

  4. Commissioning providers sometimes use BAS trend logs instead of manual tests. What is their main advantage?

    Answer: They capture system behavior over time and across changing conditions

    Trends show performance across many hours and conditions, which exposes hunting, schedule errors and sequence faults.

  5. A commissioning plan tests a 20% random sample of VAV boxes and the failure rate in that sample exceeds the allowed threshold. What typically follows?

    Answer: Additional boxes or the full population are tested at the contractor's expense

    Sampling plans usually require wider testing when the sample failure rate shows a systemic problem.

  6. During an airside economizer functional test, which item is most important to confirm?

    Answer: The economizer stops using outdoor air at the high-limit changeover setpoint

    Correct high-limit changeover prevents economizing when outdoor air would add cooling load, while minimum ventilation is kept.

  7. Applying a systematic commissioning process to an existing building that was never commissioned is called:

    Answer: Retro-commissioning

    Retro-commissioning applies the Cx process to an existing building that was never commissioned before.