Mitsubishi Electric MUZ-FE09NA Service Manual page 2

Use the specified refrigerant only
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the spec labels provided with our products.
We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by
failure to follow the instructions.
<Preparation before the repair service>
Prepare the proper tools.
Prepare the proper protectors.
Provide adequate ventilation.
After stopping the operation of the air conditioner, turn off the power-supply breaker and pull the power plug.
Discharge the capacitor before the work involving the electric parts.
<Precautions during the repair service>
Do not perform the work involving the electric parts with wet hands.
Do not pour water into the electric parts.
Do not touch the refrigerant.
Do not touch the hot or cold areas in the refrigeration cycle.
When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to
touch the live parts.
• When the refrigeration circuit has a leak, do not execute pump down with the
compressor.
• When pumping down the refrigerant, stop the compressor before disconnecting the
refrigerant pipes. The compressor may burst if air etc. get into it.
• When opening or closing the valve below freezing temperatures, refrigerant may
spurt out from the gap between the valve stem and the valve body, resulting in injuries.
Revision A:
• MUZ-FE18NA has been added.
Revision B:
• MUZ-FE09NA - and MUZ-FE12NA1 have been added.
1
Revision C:
• Specification has been corrected.
[Capacity Rated Capacity Rated (Maximum), Power consumption Rated
Revision D:
• MUZ-FE09NAH and MUZ-FE12NAH have been added.
Revision E:
• The formula for calculating the additional refrigerant charge has been corrected.
Revision F:
• The descriptions of the expansion valve coil have been corrected. (10-4.)
• Some descriptions have been modified.
Revision G:
• A warning when opening or closing the valve has been added.
OBH543G
WARNING
2
Power consumption Rated (Maximum)]