Mitsubishi Electric PAA-A18AA1 Service Manual page 4

WARNING
Risks related to PAA unit servicing
• PAA unit must be serviced by a dealer, contractor, or technician with certifications
required by laws and codes.
– Improper service by the user may result in injury or damage to the unit such as water
leakage, electric shock, or fire.
• Be sure the unit is installed in a place that can withstand its weight before servicing.
– Inadequate strength may cause the unit to fall, resulting in injuries.
• In order to prevent the PAA unit from falling during typhoons, hurricanes, earthquakes
etc., be sure the unit is properly secured.
– Improper service may cause the unit to topple and result in injury.
• Prohibit anyone without the proper qualifications from doing repairs. If the air conditioner
must be repaired, consult a dealer, contractor or technician with certifications required by
laws and codes.
– If the PAA unit is repaired improperly, water leakage, electric shock, or fire may result.
• Service the air conditioner according to this service manual.
– If the unit is serviced improperly, water leakage, electric shock, or fire may result.
• Ensure the outdoor unit cover panel is installed correctly. Please refer to the outdoor
unit's manual for proper installation.
– If the terminal cover panel is not installed correctly, dust or water may enter the
outdoor unit, which could result in fire or electric shock to the user.
• Ensure that the stop valves are opened immediately after connecting, vacuuming and
pressure testing the refrigerant lines when connecting the PAA unit to the outdoor unit.
– Failure to due so may cause the PAA unit or refrigerant lines to rupture because of
high-pressure refrigerant during the furnace's heating operation.
• If the PAA unit is not installed according to the installation manual, which requires a float
switch, condensed water from the PAA heat exchanger will deviate from the specified
path and may cause water to leak on to the heat exchanger of the gas furnace. This
may cause gas, oil, and water leakage from the furnace due to corrosion over time.
Furthermore, this can lead to poisoning, fire, explosion, water leakage, and bodily harm
and damage to property.
• When PAA unit (this product) is supported from the ceiling in a garage or an occupied
area, the product may fall due to insufficient strength of the suspension or support,
or deterioration over time, etc., causing bodily harm and damage to property. In some
cases, it can lead to death. Properly support the PAA unit in these situations.
Specifications are subject to change without notice.
PAA-A18, 24, 30, 36, 42AA1/BA1/CA1
4 © 2022 Mitsubishi Electric US, Inc.