TCL CWH09TBAI Service Manual page 30

protective (explosion-proof) devices.
 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
Air Conditioner Service Manual
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