Toshiba MCY-MHP0806HT8-C Series Service Manual page 10

If, in the course of carrying out repairs, it becomes absolutely necessary to check out the electrical parts with
the electrical control 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 so that no-one will approach the
Do not bring a
work location before proceeding with the work. Third-party individuals may enter the work site and receive
child close to
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 drain
off method, otherwise a leak or production of fire is caused at the user's 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 poisoning may
No fire
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 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
Refrigerant
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
Assembly /
side.
Wiring
After the work has finished, be sure to use an insulation tester set (500 V Megger) to check the resistance is
1 M or more between the charge section and the non-charge metal section (earth position).
If the resistance value is low, a disaster such as a leak or electric shock is caused at user's side.
Insulator
check
If refrigerant gas has leaked during the installation work, ventilate the room immediately.
If the leaked refrigerant gas comes in contact with fire, noxious gas may be generated.
Ventilation
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