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NADCA ASCS Exam
Air Systems Cleaning Specialist (Page 4 )

Updated On: 7-Feb-2026
Page 4 of 31
PDF with 148 Questions

In what sequence is an HVAC system typically cleaned?

  1. Supply, air handler, return
  2. Exhaust, air handler, return, supply
  3. Return, supply, exhaust, air handler
  4. Return, air handler, supply

Answer(s): B



According to ACR, The NADCA Standard, coil cleaning should be performed:

  1. on the upstream side only.
  2. on both the upstream and downstream sides.
  3. on the downstream side only.
  4. when the system is running.

Answer(s): B



After cleaning the ductwork for a residential high efficiency gas furnace, the client calls stating there is water on the floor around the furnace. Which of the following is the MOST likely cause?

  1. Disconnected condensate pump
  2. Disconnected gas line
  3. Leaking refrigerant liquid line
  4. Leaking condenser coil

Answer(s): A



When a properly wired condensate pump fails, it will:

  1. turn off the HVAC system.
  2. allow bypass of the condensate.
  3. maintain HVAC system airflow.
  4. engage dehumidification cycle.

Answer(s): B



If there is an insufficient drain, an HVAC system condensate drain line should be connected to a:

  1. condensate neutralizer.
  2. condensate reservoir.
  3. condensate collector.
  4. condensate pump.

Answer(s): D



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