Air conditioning manufacturers repair point refrigeration system failure to share:
1. Refrigeration system of the normal parameters of
In the air conditioning repair, the first thing to figure out air conditioning repair parameters such as the current, the pressure [high-pressure pressure low pressure], voltage frequency machine to test
test compressor operating frequency, outlet temperature, etc., the following specific introduction.
The first thing you need to do is to find out the maintenance parameters of the air conditioner such as current, pressure [high pressure, low pressure], voltage inverter machine to measure
test compressor operating frequency, air outlet temperature, etc., the following specific introduction .
1. refrigeration working condition parameters
1. refrigeration system in the normal low pressure between 4-6kgf/cm2
2. refrigeration system in the normal high-pressure between 16-19kgf/cm2
3. air-conditioner outlet temperature should be between 12-15C
4. the temperature difference between the inlet and outlet should be more than 8C
5. 38C outdoor temperature at a standstill when the equilibrium pressure of about 10kgf/cm2
[The above parameters are related to the ambient temperature of the indoor and outdoor maintenance should be specifically analyzed]
6. closed reciprocating piston compressor shell temperature of 50C or so.
7. hermetic reciprocating scroll compressor shell temperature of about 60C.
8. hermetic piston rotary compressor shell temperature of about 50C.
9. The low pressure tube temperature is generally around 15C, normally the low pressure tube should be dew but not frost, such as frost means
system lack of fluorine or clogging.
10. The exhaust pipe temperature is usually between 80-90C. If the temperature is too low, it means that the system lacks fluorine or is clogged, and if the temperature is
too high, it means that there is air in the system or the compressor is mechanically defective.
11. according to the suction tube condensation to add freon, freon is not enough to add the suction tube can appear frost phenomenon,
when the compressor suction tube on the upper part of the frost means that the amount of fluoride at this time.
12. Fan motor shell temperature is generally not more than 60C.
13. Air conditioner running one hour after the indoor drain should be drained.
14. In the indoor or outdoor unit can hear the flow of refrigerant in the capillary tube, if you can not hear the flow of sound indicates that the refrigeration
air conditioning repair system has problems.
II. Parameters of the heating state
1. Normal low pressure of the refrigeration system is between 4-6kgf/cm2.
2. The normal high pressure of the refrigeration system is between 15~22kgf/cm2 during winter heating.
3. In winter heating, when the ambient temperature should be 10'when the system balance pressure should be 6kgf/cm2 or so.
4. Winter heating, when the ambient temperature is too low outdoor radiator frost phenomenon.
5. When adding fluorine in winter, the bottom pressure of the refrigeration system should not exceed 3.5kgf/cm2.
6. winter heating, heat pump air conditioner outlet temperature should be between 35 ~ 42'C, the temperature difference between the inlet and outlet should be greater than 15'C
[The above parameters are related to the indoor and outdoor ambient temperatures should be analyzed specifically in the maintenance]
7. winter heating, electric air conditioner Outlet temperature should be between 30~45'C, the temperature difference between inlet and outlet should be more than 15'C or more.
8. When heating in winter, the compressor shell temperature should be about 10'C lower than the cooling state.
9. When heating in winter, when the air conditioner is in the defrost state, the compressor is running normally, and the indoor and outdoor fan motors should stop running. The inverter air conditioner is designed to defrost without stopping,
10. When adding fluorine in winter, the air conditioner should be placed in the cooling state, it is best to use the quantitative filling, such as conditions do not allow, through the measurement
measurement of the system high pressure to add fluorine, the high pressure is generally not more than 20kgf/cm2 is appropriate.
11. Winter heating, when the ambient temperature is lower than -5'C, the air conditioner heating effect will be significantly lower, and the outdoor unit will also appear frost phenomenon.
12. Heating operation, the check valve should not be the temperature difference between the two ends, such as the temperature difference between the two ends of its internal leakage.
13. air conditioner in the defrost state, the reversing valve disconnect, this time the outdoor unit will emit a sound of airflow; such as the reversing valve
coil breaks without the sound of airflow, indicating that the reversing valve has a fault.
14 In winter heating, if the outdoor ambient temperature is high, the outdoor unit will be drained.
15, the reasons for the increase in exhaust pressure
Refrigeration system exhaust pressure and condensing temperature corresponds to the exhaust pressure and its cooling medium flow and temperature has a great relationship, but also with the compressor efficiency and cold load.
(1) refrigeration state exhaust pressure rise
1 refrigeration in the air or too much refrigerant
2 outdoor fan motor speed is low or does not run
3 outdoor temperature or fan heater is too dirty
4 electronic expansion valve is too small to open
5 tow two air conditioner indoor stand-alone not work
6 Refrigeration system within the semi-blockage. (Dirty blockage, ice blockage, oil blockage, the angle valve is not open all)
(2) heating state of the reasons for the increase in exhaust pressure
1 refrigeration system in the air or refrigerant is too much
2 indoor radiators or filter blockage
3 high indoor temperature or filter blockage
4 indoor fan motor speed is low or does not run
5 Indoor fan motor mechanical failure blade jammed
6 Electronic expansion valve opening too small
7 System internal semi-blockage. (i.e., dirty plug, ice plug, oil plug, the angle valve is not open all)
The second exhaust pressure reduction causes
Refrigeration system
The second exhaust pressure reduction causes
Refrigeration system exhaust pressure corresponds to the condensing temperature, the suction pressure in the exhaust temperature also corresponds.
Air conditioning repair a refrigeration system exhaust pressure reduction causes:
1 refrigeration system lack of fluorine
2 indoor fan motor speed is low or does not run
3 compressor exhaust efficiency is reduced
4 4 four-way reversing valve or solenoid bypass valve leakage
5 refrigeration system clogging or outdoor unit bottom pressure valve did not open
6 inverter compressor does not raise the frequency
The reason why the exhaust pressure decreases in the heating state:
1 internal leakage of the four-way reversing valve;
2 internal leakage of the one-way valve or the auxiliary capillary tube is blocked
3 the lack of fluorine in the refrigeration system
4 the outdoor ambient temperature is too low
5 outdoor unit is not defrosted or defrosted
6 the radiator is too spoiled. Outdoor radiator is too spoiled
7 compressor exhaust efficiency
8 outdoor fan motor speed is low or does not run
9 inverter compressor does not raise the frequency
Three reasons for the rise in suction pressure
Refrigeration system suction pressure corresponds to the temperature of the evaporator, the fact that suction pressure corresponds to the temperature of the exhaust gas. That is, the suction pressure is high, the exhaust pressure is also relatively high, and vice versa, the bottom
(1) refrigeration system under the suction pressure rise for the following reasons:
1 electronic expansion valve is too large.
2 outdoor ambient temperature is too high
3 system air or fluorine excess
4 outdoor fan motor speed is too low or does not run
5 outdoor radiator is too spoiled
6 compressor suction and discharge efficiency is reduced
(2) refrigeration system under the suction pressure increases due to the following reasons:
1 indoor radiators
2 Indoor fan motor does not rotate or stops
3 Leakage inside the 4-way reversing valve
4 High outdoor ambient temperature
5 The electronic expansion valve opens too large
6 There is air in the system or excessive fluorine
7 Decrease in the efficiency of suction and discharge of the compressor
Four reasons for the decrease in suction pressure
1 Refrigeration status
1 Refrigeration status
1 The causes for the decrease in suction pressure are as follows p>
I The reasons for the reduction of suction pressure in the cooling state are as follows:
1 Too little refrigerant in the refrigeration system
2 Reduced suction and discharge efficiency of the compressor
3 Indoor radiators or filters are too swollen and clogged. Clogging
4 Indoor ambient temperature is too low
5 Electronic expansion valve is too small
6 Indoor fan motor speed is too low or does not run
7 Refrigeration system semi-clogging (spoiled plugs, ice plugs, oil plugs)
(2) The reasons for the decrease in suction pressure in the heating state are as follows:
1 Clogging inside the system or low refrigerant
2 Compressor pressure is low.
2 Compressor suction and discharge efficiency is reduced
3 Electronic expansion valve is opened too large.
4 Outdoor ambient temperature is too low
5 Outdoor unit does not defrost or defrost effect is poor
6 Outdoor fan does not rotate or the radiator is too stolen
7 Outdoor fan speed is too low or stopped
8 Reversing valve or by-pass valve leakage
The causes of the temperature change of the refrigeration system are as follows:
The temperature of the refrigeration system is the same as the suction pressure. Refrigeration system evaporating temperature in the suction pressure corresponds to the condensing temperature in the exhaust pressure corresponds to, by analyzing the suction in the exhaust pressure
Changes, it is the same as analyzing the evaporating temperature in the condensing temperature changes
1 system suction temperature is high, the suction pressure is correspondingly high,
2 system suction temperature is the bottom of the suction pressure is the bottom of the suction temperature is correspondingly low
3 system flow rate, suction temperature is the bottom of the
4 system flow rate, suction temperature is the lowest
3 system flow rate, suction temperature is the bottom of the system.
4 system flow is small, the suction temperature is high
5 system capillary tube must be, the refrigerant injection amount is too much, the suction temperature is bottom
6 system capillary tube must be, the refrigerant injection amount is too little, the suction temperature is high
7 system electronic expansion valve is open too small, the suction temperature is bottom
8 system electronic expansion valve is open too large, the suction temperature is high
9 system refrigerant expansion valve is open too large, the suction temperature is high
9 system refrigerant expansion valve is open too large, the suction temperature is high
10 p>
9 system condensing temperature is high, exhaust pressure should be relatively high,
10 system condensing temperature is low, exhaust pressure should be relatively low,
"Air conditioning troubleshooting key points" (my years of experience in air conditioning troubleshooting summarized)
Color TV overhaul should be "ask, hear, listen, diagnosis" air conditioning overhaul should be "see, hear, feel, smell, detect" points, what are the five:
Look; power supply voltage is normal, the power supply voltage is not normal, the power supply voltage is normal. p>See; power supply voltage normal or not. Whether the radiator is too stolen joints whether there is oil stains compressor suction pipe condensation normal whether the fault code to distinguish between fault points
Listen; compressor. Is the fan motor running normally? Is the airflow sound normal when the 4-way reversing valve is reversing? Is the noise of the whole machine normal? Is there any suction and closure sound when the reversing valve is working? Expansion valve in the refrigerant flow sound is normal
Touch fan motor compressor shell temperature is normal No capillary tube over the green surface temperature is normal No compressor suction and exhaust temperature is normal No
The four-way reversing valve four connecting tube temperature is normal No one-way valve whether the temperature difference between the two ends of the
The second refrigeration system causes
Refrigeration When the refrigeration system has a fault, it is generally possible to directly observe the faulty part of the system. Generally not possible to directly observe the faulty parts, so it is necessary to measure the refrigeration system
high and low pressure values and compare the normal value, and then analyze the causes of failure.
Plug The temperature of the high-current connector is normal whether the shell temperature of the IPM power module is normal whether
Smell Refrigerant Refrigerant oil smell is normal whether there is a burning smell of electrical components
Measurement Temperature of the air conditioner air inlet and outlet is normal whether the suction and exhaust pressure of the compressor is normal whether the air conditioner operating current is normal to the load voltage