Toshiba Estia RUA-CP1701H, Руководство по обслуживанию

Страница: 7 / 164

Monobloc Outdoor Unit Service Manual
6
⚠
WARNING
<Insulation treatment>
After connecting a cut lead with a crimp contact, discharge by facing the closed side upward.
• Connect lead wires with crimping terminals and turn the closed end upwards to avoid exposure to water.
<Watch out for fire>
Observe the following instructions when repairing the refrigerant cycle.
(1) Watch out for surrounding fire. Always put out the fire of stove burner or other devices before starting the repair.
Should the fire fail to be put out, the oil mixed with refrigerant gas could catch fire.
(2) Do no use a welder in a closed room. A room with no ventilation may cause carbon monoxide poisoning.
(3) Keep away flammable materials.
<Use refrigerant carefully>
Check the refrigerant name to use the tools and members appropriate for the refrigerant.
• A product using the refrigerant R410A has the refrigerant name prominently displayed on its outdoor unit. In addition,
the diameter of the service port is changed from that of the conventional R22 to prevent incorrect filling.
Never use refrigerant other than R410A for Air to Water Heat Pump using R410A. Also, never use R410A for Air
to Water Heat Pump using other refrigerant (such as R22).
• A mixture of R410A with different refrigerants excessively raises the pressure in the refrigerant cycle, that could lead
leading to injury due to burst failures.
Do not make additional charge of the refrigerant.
• An additional charge when refrigerant gas leaks changes the refrigerant composition in the refrigerant cycle,
causing the characteristics change of the Air to Water Heat Pump or excessive high pressure in the refrigerant cycle
with more than the specified amount of refrigerant charged. This may cause burst or an injury. If the refrigerant gas
leaks, perform a refrigerant recovery to ensure the Air to Water Heat Pump contain no refrigerant, and then perform
vacuuming. After that, refill the unit with the defined amount of liquid refrigerant. Never charge refrigerant exceeding the
amount specified.
When the refrigerant cycle is refilled with refrigerant, do not enter air or refrigerants other than the specified
refrigerant, R410A.
• A mixture of R410A with air or an inappropriate substance causes excessive high pressure inside the refrigerant
cycle, leading to an injury due to burst failure.
Check that there is no refrigerant gas leak after the installation is completed.
• If it catches fire of a fan heater, a space heater, or a stove, poisonous gases may be produced
<Be careful with wiring>
After a repair is completed, be sure to reassemble the parts and put the wiring back to its original state. In
addition, be careful with the internal wiring not to be caught in a cabinet or panel.
• A defective assembly or wiring may cause a disaster at a customer site due to electrical leakage or a fire.
<Check for water leak>
After the repair of a water pathway is completed, check that there is no water leak.
• In using the product, water leak may cause a fire at a customer site due to electrical leakage or an electric shock.
<Check insulation>
After the work is completed, check with an insulating-resistance tester (500V) that the insulation resistance
between the live and dead-metal parts is 2 M
Ω
or higher.
• A low insulation resistance may cause an accident at a customer site due to electrical leakage or an electric shock.
<Caution: electric shock>
When checking a circuit while energized if necessary, use rubber gloves not to contact the live part.
• Contact with the live part may cause an electric shock.
• The unit contains high-voltage circuits. Contact with a part in the control board with your bare hand may cause an
electric shock. Take enough care to check circuits.
<Turn off the power breaker>
Because the electrical components are energized with high voltage, always turn off the power breaker before
starting to work.
• Failure to do so may cause an electric shock.
<Always do>
Should refrigerant gas leak, find where the gas leaks and properly repair it.
• To stop the repair work because the leakage location cannot be identified, perform refrigerant recovery and close the
service valve. Although refrigerant gas alone is harmless, if it catches fire poisonous gases may be produced.
When installing the unit or re-installing it after relocation, follow the installation guide for proper operation.
• A defective installation may cause a refrigerant cycle defective, a water leak, an electric shock, or a fire.