Safety Precaution - Mitsubishi Electric PUZ-HWM140VHA Service Manual

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SAFETY PRECAUTION

MEANINGS OF SYMBOLS DISPLAYED ON THE UNIT
This mark is for R32 refrigerant only. Refrigerant type is written on nameplate of heat pump unit.
WARNING
In case that refrigerant type is R32, this unit uses a flammable refrigerant.
(Risk of fire)
If refrigerant leaks and comes in contact with fire or heating part, it will create harmful gas and there is risk of fire.
Read the OPERATION MANUAL carefully before operation.
Service personnel are required to carefully read the OPERATION MANUAL and INSTALLATION MANUAL before operation.
Further information is available in the OPERATION MANUAL, INSTALLATION MANUAL, and the like.
2-1. ALWAYS OBSERVE FOR SAFETY
Before obtaining access to terminal, all supply circuits must be disconnected.
2-2. CAUTIONS RELATED TO NEW REFRIGERANT
Cautions for units utilizing refrigerant R32
Preparations before the repair service
• Prepare the proper tools.
• Prepare the proper protectors.
• Provide adequate ventilation.
• After stopping the operation of the air to water heat pump unit,
turn off the power-supply breaker.
• Discharge the condenser before the work involving the electric parts.
Use a vacuum pump with a reverse flow check
valve.
Vacuum pump oil may flow back into refrigerant cycle and
that can cause deterioration of refrigerant oil, etc.
Use the following tools specifically designed
for use with R32 refrigerant.
The following tools are necessary to use R32 refrigerant.
Tools for R32
Gauge manifold Flare tool
Charge hose Size adjustment gauge
Gas leak detector Vacuum pump adaptor
Torque wrench Electronic refrigerant charging scale
Do not use refrigerant other than R32.
If other refrigerant (R22, etc.) is used, chlorine in refrigerant
can cause deterioration of refrigerant oil, etc.
OCH748
Preparations 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 refrigerating 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.
Handle tools with care.
If dirt, dust or moisture enters into refrigerant cycle, that can cause
deterioration of refrigerant oil or malfunction of compressor.
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.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
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