Mitsubishi Electric PAA-A18AA1 Service Manual page 15

CAUTION
• Do not use the PAA unit in special environments.
– Oil, steam, sulfuric smoke, etc. can significantly reduce the performance of the PAA
unit or damage its parts.
• Always lock the furnace disconnect switch, if present, in the open position prior to
servicing the PAA unit.
• When servicing the unit in a hospital, communication station, or similar place, provide
sufficient protection against electromagnetic noise.
– The INVERTER equipment, private power generator, high-frequency medical
equipment, or radio communication equipment may cause the PAA unit to operate
erroneously, or fail to operate. On the other hand, the PAA unit may affect such
equipment by creating electromagnetic noise that disturbs medical treatment of image
broadcasting.
• Make sure an auxiliary drain pan is installed to prevent occasional condensation from
damaging the building.
• When the room humidity exceeds 80% or when the drain pipe is clogged, condensation
may drip from the indoor unit. Perform collective drainage work together with the outdoor
unit, as required.
• When the ambient dew point temperature exceeds 73° F (23° C), dew condensation
may occur on the unit surface. Perform appropriate treatment, such as duct wrap
insulation, to avoid dew condensation.
NOTE
Keep this service manual with the unit. Carefully read all instructions for the service prior
to servicing the product. Make sure each step or procedure is understood and any special
considerations are taken into account before starting service.
Gather all tools, hardware, and supplies needed to complete the installation. Refer to
the "System introduction" and "Indoor unit accessories" sections of the PAA installation
manual for items that are not included with the PAA unit. Make sure everything needed to
service the product is on hand before starting. If the power source capacity is inadequate
or electric work is performed improperly, electric shock and fire may result.
WARNING
• Failure to follow this warning could result in property damage, severe personal injury,
or death: verify the furnace is properly installed according to the gas furnace service
manual and local building codes.
Specifications are subject to change without notice.
PAA-A18, 24, 30, 36, 42AA1/BA1/CA1
15 © 2022 Mitsubishi Electric US, Inc.