2
1
TECHNICAL CHANGES
MSZ-WR09NA
-
U1
MSZ-WR12NA
-
U1
MSZ-WR18NA
-
U1
MSZ-WR24NA
-
U1
1. New model
MSZ-WR09NA
-
U1
MSZ-WR09NA
-
U2
MSZ-WR12NA
-
U1
MSZ-WR12NA
-
U2
1. Indoor electronic control P.C. board and indoor power P.C. board have been changed.
Revision A:
• 3. SPECIFICATION has been corrected.
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.
WARNING
• 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 B:
• 9-7. TEST POINT DIAGRAM AND VOLTAGE has been modified.
Revision C:
• MSZ-WR09/12NA -
U2
have been added.
OBH818C
