Toshiba MMU-AP0072H2UL Service Manual page 4

Before troubleshooting or repair work, check the earth wire is connected to the earth terminals
of the main unit, otherwise an electric shock is caused when a leak occurs.
If the earth wire is not correctly connected, contact an electric engineer for rework.
Check earth wires.
Do not modify the products.
Do not also disassemble or modify the parts. It may cause a fire, electric shock or injury.
Prohibition of modification.
For spare parts, use those specified (∗ ∗ ∗ ∗ ∗ ).
If unspecified parts are used, a fire or electric shock may be caused.
∗: For details, refer to the parts list.
Use specified parts.
Before troubleshooting or repair work, do not bring a third party (a child, etc.) except the repair
engineers close to the equipment.
It causes an injury with tools or disassembled parts.
Do not bring a child
Please inform the users so that the third party (a child, etc.) does not approach the equipment.
close to the equipment.
Connect the cut-off lead wires with crimp contact, etc, put the closed end side upward and
then apply a water-cut method, otherwise a leak or production of fire is caused at the users'
side.
Insulating measures
When repairing the refrigerating cycle, take the following measures.
1) Be attentive to fire around the cycle. When using a gas stove, etc, be sure to put out fire
2) Do not use a welder in the closed room.
No fire
3) Do not bring inflammables close to the refrigerant cycle, otherwise fire of the welder may
Check the used refrigerant name and use tools and materials of the parts which match with it.
For the products which use R410A refrigerant, the refrigerant name is indicated at a position
on the outdoor unit where is easy to see. To prevent miss-charging, the route of the service
port is changed from one of the former R22.
Do not useany refrigerant different from the onespecified for complement or replacement.
Otherwise, abnormally high pressuremay be generated in the refrigeration cycle, which may
result in a failure or explosion of the product or an injury to your body.
For an air conditioner which uses R410A, never use other refrigerant than R410A.
For an air conditioner which uses other refrigerant (R22, etc.), never use R410A.
If different types of refrigerant are mixed, abnormal high pressure generates in the
refrigerating cycle and an injury due to breakage may be caused.
Do not charge refrigerant additionally.
If charging refrigerant additionally when refrigerant gas leaks, the refrigerant composition in
the refrigerating cycle changes resulted in change of air conditioner characteristics or
refrigerant over the specified standard amount is charged and an abnormal high pressure is
Refrigerant
applied to the inside of the refrigerating cycle resulted in cause of breakage or injury.
Therefore if the refrigerant gas leaks, recover the refrigerant in the air conditioner, execute
vacuuming, and then newly recharge the specified amount of liquid refrigerant.
In this time, never charge the refrigerant over the specified amount.
When recharging the refrigerant in the refrigerating cycle, do not mix the refrigerant or air
other than R410A into the specified refrigerant.
If air or others is mixed with the refrigerant, abnormal high pressure generates in the
refrigerating cycle resulted in cause of injury due to breakage.
After installation work, check the refrigerant gas does not leak.
If the refrigerant gas leaks in the room, poisonous gas generates when gas touches to fire
such as fan heater, stove or cocking stove though the refrigerant gas itself is innocuous.
Never recover the refrigerant into the outdoor unit.
When the equipment is moved or repaired, be sure to recover the refrigerant with recovering
device. The refrigerant cannot be recovered in the outdoor unit; otherwise a serious accident
such as breakage or injury is caused.
After repair work, surely assemble the disassembled parts, and connect and lead the removed
wires as before. Perform the work so that the cabinet or panel does not catch the inner wires.
If incorrect assembly or incorrect wire connection was done, a disaster such as a leak or fire is
caused at user's side.
Assembly/Cabling
before work; otherwise the oil mixed with refrigerant gas may catch fire.
When using it without ventilation, carbon monoxide poisoning may be caused.
catch the inflammables.
WARNING
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