V-COOL ELECTRICAL HOLDINGS CO.,LIMITED

Heat Pump Is Easy To Frost in Low Temperature Environment? To Find the Right Way To Do a Good Job Un

Watermelon and air conditioning are indeed the cooling products of summer heat. But with the development of the times and the advancement of technology, if you only know the air conditioner and watermelon, then it is really out, and now it is leading the new trend of the revolutionary dual-system revolution - Heat pump.

A heat pump is a device that transfers the heat energy of a low-level heat source to a high-level heat source. Usually, it takes low-grade heat energy from the natural air, water, or soil energy, and works through electric power, and then provides people with high-grade grades that can be utilized. Thermal energy.

Heat pumps are generally classified into three main categories: air source heat pumps, ground source heat pumps, and water source heat pumps. However, due to geographical environment and living conditions, air source heat pumps can absorb low-grade air energy conversion from the environment at any time. Therefore, air source heat pumps have become the most widely used type of heat pump.

The air source heat pump can realize the hot and cold double system by using the low grade heat energy in the ambient air, so it has the double advantages of energy saving and environmental protection. However, one of the problems is that the heat is hot in summer, and the heat pump will not encounter frosting during the cooling operation, but it will frost in the winter when the heating is low in the area with relatively low humidity and relatively high humidity. You don't have to panic when you see the defrosting. Advanced techniques such as secondary condensation and melting technology, wide fin spacing design pressure, and automatic defrost mode can greatly reduce the frosting problem.

However, the problem of frost formation is that everyone does not have to panic. The performance and solutions of the fault are nothing more than the following: 
Frosting symptoms Reason
Solution
1. Bottom icing
The water in the water tray is not smooth, and the ice spreads to the evaporator.
In addition to water, cleaning up dirt, the water outlet is smooth.
2. Partial icing in the evaporation section
The defrosting sensor is frost-free and the defrosting point is incorrect.
The defrosting sensor is frost-free and the defrosting point is incorrect.
3. The evaporation department is full of frost / ice, no frost
1. defrosting sensor, temperature sensor failure 2. lack of fluorine or system block 3. defrosting, four-way reversing valve does not reverse, bypass defrosting system solenoid valve does not work
1. Manual forced defrosting, resistance drift, replacement of sensors 2. According to the standard fluoride, the next block 3. (1) Whether the valve is  energized (2) Whether the valve member operate normally
4. The defrosting is not clean, not thorough
1. Exit the defrosting coil temperature setting is too low, causing the frost to not be cleaned, then exit the defrosting 2. the position of the defrosting coil probe is not suitable, not placed in the most serious place of frosting
1. Adjust the defrosting parameters, say that the temperature of the defrosting is raised, and the observation can be completely defrosted. 2. Adjust the position of the defrosting probe and place it in the most severe place of frosting
5. Frequent frosting in a short time
1. finned heat exchanger dirty or foreign body blocking 2. The fan motor is damaged or the fan air volume is too low. 3. the refrigerant charge is small 4. Throttle expansion valve opening is too small 5. The area of the fin heat exchanger is too small
1. Clean the heat exchanger or remove foreign matter. 2. Repair and replace the motor or replace the larger air volume fan 3. Add refrigerant to the right pressure 4. Increase the expansion valve opening 5. Require manufacturers to replace the fin heat exchanger, increase the area
6. Frosting is very serious, the fins are all covered with thick frost layer
1. Enter the defrosting coil temperature setting is too low, or the defrosting time interval is set too long, resulting in failure to enter the defrosting action in time. 2. The defrosting coil probe is not placed properly, not placed in the most severe place of frosting.
1.Adjusting the defrosting parameters, increasing the temperature into the defrosting temperature, shorten the interval, observing the defrosting action 2. Adjusting the position of the defrosting probe, placed in the most serious place of frosting
7. Uneven frosting, local thickening frost, local no fros
1. the refrigerant is not evenly distributed, some pipelines have large flow, and some pipelines have small flow. 2. The structural design is unreasonable. For example, the height of the fin heat exchanger is too high, resulting in an excessively large difference in wind speed between the upper and lower faces.
1. Require manufacturers to adjust the structure of the refrigerant distributor to match the flow rate and evaporation capacity. 2. the manufacturer is required to not make the heat exchanger height too high, or increase the fan air volume.
8. Low pressure protection during defrosting
1. Low-pressure detection during defrosting does not achieve delay or delay time is too short 2. The throttle expansion valve is blocked or the opening is too small when it is reversed.
1. Low-pressure protection during defrosting requires delay processing or extended delay time 2. Replace the expansion valve or increase the expansion valve opening"
9. High pressure protection during defrosting
Exiting the defrosting coil temperature setting is too high, resulting in high voltage protection throwing without exiting defrost.
1. Low-pressure protection during defrosting requires delay processing or extended delay time 2. Replace the expansion valve or increase the expansion valve opening
10. The fins have no frosting, no defrosting action
Entering the defrosting coil temperature (or temperature difference) setting too high, resulting in malfunction.
1. Low-pressure protection during defrosting requires delay processing or extended delay time 2. Replace the expansion valve or increase the expansion valve opening

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