Aiwa -09CHSRINV/TP11 Service Manual page 28

 It is necessary to provide firefighting devices such as dry powder or carbon dioxide fire extinguisher
appropriate for extinguishing the electrical fire and keep such firefighting devices in a usable
condition.
 Temporary wires and sockets are prohibited on the maintenance location.
6). Requirements for fill the refrigerants
 It is necessary to use nitrogen to clear the cyclic system before operating the refrigerating system and
vacuumize the outdoor unit for 30 minutes at least.
 It is necessary to ensure that there is no cross contamination among different refrigerants when the
refrigerant filling device is used. The total length including the refrigerant pipeline should be as short
as possible in order to reduce the residual refrigerant inside such pipeline.
 It is necessary to vertically place the refrigerant storage tanks.
 It is necessary to ensure that the refrigerating system is in ground connection before the refrigerant is
filled.
 When filling the refrigerant, it is necessary to fill corresponding type and volume of refrigerant as per
the requirements on the product nameplate and overfilling is prohibited.
 It is necessary to seal the system in a safe sealing way after maintaining the refrigerating system.
 It is necessary to ensure that the maintenance will not damage or reduce the safety protection grade
of the original system.
7). In-maintenance welding
 It is necessary to ensure that the maintenance location is well-ventilated.
 Before welding the outdoor unit, it is a must to confirm that the refrigerating system has been drained
and the system has been cleaned and ensure that there has been no refrigerant in the outdoor unit.
 It is necessary to close the stop valve of the outdoor unit when using a welding gun to do the
maintenance work such as cutting and welding.
8). Maintenance of electrical components
 It is necessary to use a special leak detector to check whether the maintained electrical parts location
have the leak refrigerant.
 It is not allowed to refit, remove or cancel any component with the safety protection function after
finishing the maintenance process.
 When maintaining the sealed parts, it is necessary to turn off the power of air conditioner before
opening the sealing cover. When power supply is needed, it is necessary to do the ongoing leak
detection at the most dangerous position in order to prevent potential danger.
 It is necessary to specially note that the maintenance of electrical components will not affect the
replacement of protective cover.
 In order to ensure that the sealing function is not damaged after maintenance or the sealing material
will not lose the effect of preventing the combustible gas leak due to ageing. So the substitute
components should meet the requirements recommended by the air conditioner manufacturer.
Warning
Before doing the trial operation after finishing the maintenance, it is a must to use a practical leak
detector to inspect the leakage and reliability of ground connection in order to ensure that no refrigerant
leakage and reliable ground connection.
The refrigerant storage tanks should be separately placed in a well-ventilated place at the temperature
ranging from -10℃ to 50℃ and label them with warning labels.
9). Emergency Accident Handling
A maintenance station should establish emergency handling plans. It is necessary to take appropriate
Air Conditioner Service Manual
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