Service Hotline:8602865518699
E-mail:cdoi@cdoi.com

Detecting an error method for insufficient refrigerant

Release time:

2021-08-12

　　1. Use your hand to touch the suction pipe and exhaust pipe to sense the temperature of the copper pipe.

　　What errors are there in this measurement?

　　a. How to know if the perceived temperature is in the optimal state;

　　b. The temperature perceived by the human body is 37℃ or higher (the maximum sensation of the skin is 49℃);

　　c. An exhaust temperature of 49℃ is not the optimal state.

　　Everyone has a different sense of hot and cold. If your hand has calluses, the temperature you perceive will be higher than the actual temperature. Generally, the human body feels hot at temperatures above 37℃ and cool at temperatures below 37℃. The temperature limit perceived by the skin is 49℃, so the temperature of the liquid pipe perceived by your hand may not be a good condensation temperature.

　　This method only tells you that the compressor is running.

　　2. Observe the bubbles in the sight glass.

　　What errors are there in this measurement?

　　a. Gas boiling;

　　b. The pressure in the liquid pipe drops too much;

　　c. There is no subcooling.

　　This indeed indicates that the presence of bubbles signifies a lack of refrigerant, but pressure loss in the liquid pipe can also cause bubbles. If the pressure loss in the liquid pipe is significant, the liquid refrigerant will flash into gas, and the flashing gas will reduce the flow of refrigerant as it passes through the expansion valve, which can also erode the expansion valve. If the system's subcooling is very small, pressure loss can easily produce bubbles seen in the sight glass.

　　If you see bubbles in the sight glass caused by pressure loss rather than insufficient refrigerant, and you continue to add refrigerant to eliminate the bubbles, you will find that the high pressure rises and causes the machine to trip.

　　This method cannot accurately determine the refrigerant charge amount in the system.

　　3. Measure high and low pressure.

　　What errors are there in this measurement?

　　a. The condenser coil is dirty.

　　b. The evaporator coil is dirty.

　　c. The filter screen is dirty.

　　d. The evaporator fan speed is incorrect.

　　e. The condenser fan blades are incorrect.

　　Insufficient airflow from the condenser and evaporator will affect the tested refrigerant pressure. If the condenser airflow is insufficient, the high pressure will be very high; if the evaporator airflow in the expansion valve system is insufficient, the low pressure will be very low. Before testing the pressure of the air conditioning system, you must confirm that the condenser and evaporator airflow are sufficient. The finned coil and filter screen must be clean, and the fan speed must be correct; check to ensure that the fan blades are not deformed or damaged and are correctly installed on the shaft.

　　The temperature difference between the inlet and outlet air of the product's condenser is 16.7℃, and the measured inlet air temperature of the condenser plus 16.7℃.

　　Then convert it to pressure, and this pressure value should be the same as the tested pressure.

Previous： How to correctly detect insufficient refrigerant

Next： What is refrigerant charging

Online message

The main products of our company now include refrigerant filling machine, explosion-proof filling machine, vacuum purification filling machine, special power supply, helium inspection equipment, etc.

* Note: Please be sure to fill in the information accurately and keep the communication unblocked. We will get in touch with you as soon as possible.

Detecting an error method for insufficient refrigerant

Share

Sorry，当前栏目暂无内容!

Sorry，The current column has no content!

Online message