Toshiba MMK-AP0074MHP-E1 Service Manual page 8

When any of the electrical parts are to be replaced, ensure that the replacement parts satisfy the
specifications given in the Service Manual (or use the parts contained on the parts list in the Service
Manual).
Use of any parts which do not satisfy the required specifications may give rise to electric shocks,
Use specified
smoking and/ or a fire.
parts.
RefrigerantIf, in the course of carrying out repairs, it becomes absolutely necessary to check out the
electrical parts with the electrical parts box cover of one or more of the indoor units and the service
panel of the outdoor unit removed in order to find out exactly where the trouble lies, put a sign in place
Do not bring a
so that no-one will approach the work location before proceeding with the work.
child close to
Third-party individuals may enter the work site and receive electric shocks if this warning is not heeded.
the equipment.
Connect the cut-off lead wires with crimp contact, etc., put the closed end side upward and then apply
a watercut method, otherwise a leak or production of fire is caused at the users' side.
Insulating
measures
When performing repairs using a gas burner, replace the refrigerant with nitrogen gas because the oil that
coats the pipes may otherwise burn. 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 before work;
otherwise the oil mixed with refrigerant gas may catch fire.
2) Do not use a welder in the closed room. When using it without ventilation, carbon monoxide
No fire
poisoning may be caused.
3) Do not bring inflammables close to the refrigerant cycle, otherwise fire of the welder may catch the
inflammables.
The refrigerant used by this air conditioner is the R410A.
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.
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.
When the air conditioner has been installed or relocated, follow the instructions in the Installation
Manual and purge the air completely so that no gases other than the refrigerant will be mixed in the
refrigerating cycle. Failure to purge the air completely may cause the air conditioner to malfunction.
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
Refrigerant
specified standard amount is charged and an abnormal high pressure is 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 injuryis 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
Assembly/ incorrect wire connection was done, a disaster such as a leak or fire is caused at user's side.
Wiring
After the work has finished, be sure to use an insulation tester set (500V Megger) to check the resis-
tance is 1MΩ or more between the charge section and the non-charge metal section (Earth position).
Insulator If the resistance value is low, a disaster such as a leak or electric shock is caused at user's side.
check
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FILE NO. SVM-14078