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Mitsubishi Electric · Mitsubishi Electric Ecodan PUZ-WM outdoor unit (R32) · Maintenance

Ecodan PUZ-WM: power supply, snow and condensate – what the user can do

Summary (editorial)

The manual explains keeping the power on, waiting before switching on again, not washing the outdoor unit with water and why condensate drains from the unit.

✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.

From the manufacturer's documentation (English source wording, with page)

  1. Turn on the main power switch more than 12 hours before starting operation; keep it on during the operation season[1]
  2. After stopping operation, wait at least five minutes before turning off the main power switch, otherwise water leakage or breakdown may result[2]
  3. Do not clean the outdoor unit with water. Electric shock may result.[3]
  4. The outdoor unit produces condensation during the heating operation[4]
  5. Note that water may drain from the unit during operation[5]
  6. Snow blocking the air intake can reduce the airflow and a malfunction may result[6]
  7. The base and attachments of the outdoor unit must be periodically checked for looseness, cracks or other damage[7]
  8. Do not touch the refrigerant pipes with bare hands during operation – burns or frostbite may result[8]
  9. Do not touch any switch with wet hands. Electric shock may result.[9]
  10. Make sure to provide drainage around the outdoor unit if such condensation is likely to cause damage[10]

⚠ Work on refrigerant circuits, mains electricity and PV DC wiring is for qualified technicians only.

The Polish page has more detail (plain-language explanation, safe checks, guides): Read in Polish →

Sources

Every statement has a footnote to the document and PDF page. “Quote verified” means the quote was found automatically in the text of that page.

  1. [1] Mitsubishi Electric – Air to Water Heat Pump PUZ-WM•AA series, PUZ-WM•HA series, Installation Manual (BH79D849H02) (BH79D849H02) , p. 5 official manufacturer document quote verified Keep the main power switch
  2. [2] Mitsubishi Electric – Air to Water Heat Pump PUZ-WM•AA series, PUZ-WM•HA series, Installation Manual (BH79D849H02) (BH79D849H02) , p. 5 official manufacturer document quote verified After stopping operation, be sure to wait at least five
  3. [3] Mitsubishi Electric – Air to Water Heat Pump PUZ-WM•AA series, PUZ-WM•HA series, Installation Manual (BH79D849H02) (BH79D849H02) , p. 4 official manufacturer document quote verified Do not clean the outdoor unit with water
  4. [4] Mitsubishi Electric – Air to Water Heat Pump PUZ-WM•AA series, PUZ-WM•HA series, Installation Manual (BH79D849H02) (BH79D849H02) , p. 4 official manufacturer document quote verified The outdoor unit produces condensation during
  5. [5] Mitsubishi Electric – Air to Water Heat Pump PUZ-WM•AA series, PUZ-WM•HA series, Installation Manual (BH79D849H02) (BH79D849H02) , p. 6 official manufacturer document quote verified Note that water may drain from the unit during operation
  6. [6] Mitsubishi Electric – Air to Water Heat Pump PUZ-WM•AA series, PUZ-WM•HA series, Installation Manual (BH79D849H02) (BH79D849H02) , p. 6 official manufacturer document quote verified and a malfunction may result
  7. [7] Mitsubishi Electric – Air to Water Heat Pump PUZ-WM•AA series, PUZ-WM•HA series, Installation Manual (BH79D849H02) (BH79D849H02) , p. 4 official manufacturer document quote verified be periodically checked for looseness, cracks or
  8. [8] Mitsubishi Electric – Air to Water Heat Pump PUZ-WM•AA series, PUZ-WM•HA series, Installation Manual (BH79D849H02) (BH79D849H02) , p. 5 official manufacturer document quote verified Do not touch the refrigerant pipes with bare hands
  9. [9] Mitsubishi Electric – Air to Water Heat Pump PUZ-WM•AA series, PUZ-WM•HA series, Installation Manual (BH79D849H02) (BH79D849H02) , p. 5 official manufacturer document quote verified Do not touch any switch with wet hands
  10. [10] Mitsubishi Electric – Air to Water Heat Pump PUZ-WM•AA series, PUZ-WM•HA series, Installation Manual (BH79D849H02) (BH79D849H02) , p. 4 official manufacturer document quote verified age around the outdoor unit if such condensation is