Air Conditioner Service Manual
20
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
precautionary measures in work. For example, it is prohibited to enter the location with any kindling material
and it is prohibited to wear clothing or shoes which easily produce static.
Handling suggestions when a large amount of combustible refrigerant leaks:
It is necessary to immediately operate the ventilating equipment while cutting off other power supply and
evacuating the affected personnel urgently from the location.
It is necessary to inform near residents of evacuating for over 20 meters from the location, make an alarm
call, set the emergency area and prohibit irrelevant personnel and vehicles from approaching.
The professional firefighters should wear anti-static clothing to handle the emergency on the site and cut
off the source of leak.
It is necessary to use nitrogen for blowing the site, especially the low-lying positions, clear away the
residual combustible refrigerant gas from any area nearby and surrounding the leak point and use a
handheld detector for detection and not clear the alarm until the concentration of refrigerant is zero.
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