Toshiba MMW-AP0481CHQ-E Service Manual page 8

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 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 refrigerants used by this hot water module is the R410A and R134a.
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 hot water module which uses R410A and R134a, never use other refrigerant than R410A and R134a.
For an hot water module which uses other refrigerant (R22, etc.), never use R410A and R134a.
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 hot water module 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 hot water module 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 hot water module characteristics
or refrigerant over the specified standard amount is charged and an abnormal high pressure is applied to the
Refrigerant
inside of the refrigerating cycle resulted in cause of breakage or injury. Therefore if the refrigerant gas leaks,
recover the refrigerant in the hot water module, 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 and
R134a 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 cooking 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 fs
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 MΩ 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
When the refrigerant gas leaks during work, execute ventilation.
If the refrigerant gas touches to a fire, poisonous gas generates. A case of leakage of the refrigerant and the
closed room full with gas is dangerous because a shortage of oxygen occurs. Be sure to execute ventilation.
Ventilation
(*1): Refer to the "Definition of Qualified Installer or Qualified Service Person"
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