AUX air conditioner service manual
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there is some leak source, refrigerant will leak out and air conditioner can’t cooling proper or
absolutely stop refrigerating. Leakage sources locate mainly on welds of evaporator, condenser, and
capillary, return gas and discharge tube of compressor, flare mouth, copper nut, connection tubes and
etc. Check the air conditioner visually and then inspect joints of tubes carefully. Generally, there’s
grease spot on the leakage source.
⑶Four-way valve fault: Generally occur when air conditioner works in heating mode. If four-way
valve can’t close tightly or is blocked, air conditioner can’t have a good effect. We can check close
condition of four-way valve when it is switched on or switched off. To fix the problem, we can switch
on air conditioner repeatedly or slightly knock four-way valve and make it restore its original position.
⑷One-way valve fault: one-way valve can only work in cooling mode, but when air conditioner
operating in heating mode, refrigerant will flow through auxiliary capillary, and if one-way valve can’t
close tightly or auxiliary capillary is blocked, heat-producing will be impacted, so if air conditioner
can be operated in cooling mode but fails to produce heat properly, we shall check one-way valve
carefully, if it is not caused by fault on four-way valve.
Section one Refrigerant Filling and Filling Volume Determination
Filling refrigerant is a common problem in maintenance of air conditioner. After air conditioner
running for a long time, welding or copper tube may leak little refrigerant out to ambience.
Refrigerant in split units also will slowly leak out and cause air conditioner failing to work properly.
There’re two problems in refrigerant filling: how to fill and how to decide filling volume so that
refrigerant can meet design standard of air conditioner.
Different air conditioner has different refrigerant filling volume. Too much or too less refrigerant in air
conditioner will cause poor efficiency, higher power consumptions, shorter life and so on.
Under following conditions refrigerant shall be refilled or added:
⑴When welds or copper tube leaks, refrigerant shall be discharged completely, After welded, fixed
and vacuum properly refilling the air conditioner.
⑵If air conditioner has been running for a long time, refrigerant is not sufficient, so it shall be refilled.
⑶If the connection tube in split air conditioner had been extended, the refrigerant should be added
according to per design standard.
⒈ Operation steps for refrigerant filling
Air conditioners of different types and capacities shall be filled with different volumes of refrigerant
in different way.
⑴Add refrigerant with low pressure valve
If only small cooling capacity is required, refrigerant can be filled with low pressure valve.
Refrigerant flowing in low pressure is relatively slow, but that is safer and easier to control, so most
household air conditioners are filled with refrigerant in this way.
①Connect Low pressure hose with maintenance hole of low pressure valve and connect intermediate
hose with small refrigerant bottle. If vacuum pumping is required, firstly we shall connect high
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