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Preventative Maintenance - Problem Set 3.2

Source(s) or Contributor(s)
Pacific Northwest National Laboratory
Question
  1. Which of the following is true about the cleaning procedure for cooling coils?
  1. Coils must only be cleaned with pure water solutions.
  2. If one, but not both, of the upstream or downstream faces of the coil can be completely accessed, the coil does not need to be removed to be cleaned properly.
  3. Refrigerant must be pumped into temporary storage within the air conditioning system or into a secondary storage container before coil removal.
  4. If one, but not both, of the upstream or downstream faces of the coil can be completely accessed, the coil does not need to be removed to be cleaned properly.
  1. When cleaning air handler units, when should interior insulation be replaced?
  2. What are the guidelines for creating openings for cleaning access in metal ducts, fiberglass duct board ducts, and flexible ducts? What are the guidelines for properly closing these access openings?