AUX E Series, Руководство по обслуживанию

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AUX air conditioner service manual
197
shall be no less than 10
℃
and in heating operation, temperature difference shall be over 15
℃
;
⑤
High pressure: High pressure value of cooling operation shall be about 1.5~1.9MPa;
⑥
Weighing: When we fill the air conditioner with refrigerant, we shall weigh refrigerant with
electronic weighing appliance if available. It is one best way to add the refrigerant.
⑦
Temperature of high and low pressure valves: Normally, the low pressure valve has the lower
temperature and more condensate than the high pressure valve of split units.
To check high pressure value, the ambient temperature should add about 15
℃
, for example, ambient
temperature measured is 35
℃
, actual temperature of refrigerant in condenser shall be about 50
℃
, so
we can know high pressure is 16.6MPa(absolute pressure); to check low pressure, evaporating
temperature is assumed as 5
℃
, superheat temperature shall be 5
℃
~7
℃
, according to the
Temperature/Pressure Relation Table, low pressure is 0.59MPa(absolute pressure).
Refrigerant volume shall be determined by combining all foregoing data. However, to air conditioners
with different types and brands, foregoing data are different, especially for the air conditioners which
have been used for many years, differences are more noticeable, and detailed volume shall be
analyzed by integrating various factors. For example, evaporation pressure of an air conditioner is
lower than 0.5MPa, but running current of compressor has reached rated value. In order to use
compressor safely, evaporating pressure has to be set below 0.5MPa, though under this circumference,
refrigerating capacity of air conditioner has been lowered.
⑷
Adding of refrigerant
During installation of the air conditioner, connection tube often has to be extended because of
installation positions; all manufacturers have their own requirement of refrigerant adding for extension
tube, normally, following principle shall be complied with:
Experience Value of Refrigerant adding for Extension Tube
Refrigerating. Capacity(W) Connection Tube Size (Dia.) Adding volume /M
（
g
）
2000~3000
φ
6.35
×
0.6/
φ
9.52
×
0.6 15
3000~5000
φ
6.35
×
0.6/
φ
12.7
×
0.6 20
5000~7000
φ
9.52
×
0.6/
φ
16
×
1.0 30
7000~12000
φ
12.7
×
0.6/
φ
19
×
1.0 35
We can also calculate the volume of long tube, and then calculate adding quantity of refrigerant
according to its density.
Section two Cleaning and blowing of refrigerating system
1. Cleaning of refrigerating system
When air conditioner can’t operate properly, insulation of compressor motor may be disrupted, coils
has been short circuited or windings have been burned, a large amount of acid oxide can be produced
and refrigerant may be polluted. So, besides replacing of compressor, the whole refrigerating system
shall be cleaned.