TCL ERA YA11I Service Manual page 50

maintenance.
 Make sure powered supply to air conditioner is off. Before maintenance, it is necessary to cut off
the power and discharge the capacitor power which used in the air conditioner. If it is a must to
need the power supply during the maintenance, it is necessary to do ongoing leak detection at
the most dangerous position/point in order to avoid potential danger.
 Check the warning labels on the air conditioner whether are in good condition. It is necessary to
replace the damaged or smeared warning labels.
3. Leak inspection before maintenance
Before maintenance, use the leak detector or concentration detector (pump-type)
recommended by the corresponding air conditioner manufacturer to check the air conditioner
leak or not.
Warning
If leak may exist, it is necessary to move all the fire out from the site or extinguish fire and then
immediately shut off the air conditioner. Meanwhile, it is necessary to make sure well-ventilated.
4. Safety principles during the maintenance
 At the time of maintenance, it is necessary to ensure well-ventilation on the site.
 It is prohibited to use fire including welding, smoking or other purposes. It is prohibited to use
mobile phones.
 At the time of maintenance, if the relative humidity is lower than 40%, it is necessary to wear
anti-static clothing and gloves.
 If the combustible refrigerant is found leaking during the maintenance, it is a must to
immediately take forced ventilation and plug up the leak source.
 If the product is damaged to the extent that it is a must to open the refrigerating system for
maintenance, it is a must to carry the product back to the maintenance station for
maintenance. (It is prohibited to weld the refrigerant pipe and do other operations on the
user's site.)
 It is necessary to return the air conditioner to its initial state if it is necessary to provide
visiting service again due to lacking spare part during the maintenance. Moreover, it is a must
to ensure that the refrigerating system is in secure ground connection.
 If it is necessary to provide visiting service with a refrigerant cylinder, the volume of
refrigerant filled in such refrigerant cylinder should not exceed the stipulated value. When
such cylinder is stored in a vehicle or placed on the installation or maintenance site, it is
necessary to place it vertically and securely and keep it away from any place where there is
any heat source, combustion source, radiation source or electrical equipment.
5. Requirements for the site of maintenance-station
 The maintenance location should be well-ventilated, with leveled ground and not in a
basement.
 The maintenance should be divided into welding and non-welding areas both of which
should be labeled clearly. There should be a certain safety distance between the two areas.
The maintenance location should be equipped with ventilating and air-exhausting equipment
to prevent the refrigerant gas from aggregating.
 It is necessary to provide some relevant instruments such as combustible refrigerant leak
detector and have a leak detecting instrument management system. It is necessary to
confirm that the leak detector can work normally before maintenance.
 The main power switch should be set outside the maintenance location and equipped with
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.
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