6. Power on checking of the entire machine
Open AC control panel, turn III gear switch to H
gear and check if there is wind coming from
evaporator and if wind is big enough.
Turn on temperature control switch on AC control
panel and turns to the maximum clockwisely,
check if indication light is on, at the same time,
listen if AC compressor is absorbing (turn on and
turn off temperature control switch repeatedly,
there should be clear and melodious absorbing
―Pata, pata‖ at compressor).
7. Confirmation of charging amount of refrigeration agent
Charging amount of refrigeration agent R134a of the AC
system is 1000±50g, the process is vaccumizing,
charging and retrieving.
Comparison table between liquid sight glass state of reservoir and trouble analysis
Liquid sight glass is lacte, bubbles can be seen at the moment
of turning on and turning off AC, and bubbles become
transparent suddendly.
Freon charging quantity is proper
Few bubbles flowing, compressor head is hot, refrigeration
output is not enough, high and low pressure of the system are
both very low.
Freon charging quantity is not enough or the system
is leaking
Turn on and turn off AC, it is hard to see bubbles flowing,
compressor head is cold, high and low pressure of the system
are both high.
Freon charging is proper, AC does not refrigerate, it is hard to
see bubbles flowing in reservoir, low pressure is negative.
Expansion valve is dirty and blocked or frozen and
blocked, it shall be solved by professional personnel
Air Conditioner SPC000024
Page 9
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