Air source heat pumps will frost, don't be afraid, don't panic. Here are some simple treatment methods and common types of frost. Correct operation will help your heat pump resume work quickly.
1. Ice at the bottom of the air source heat pump
Reason
The water pan is blocked/the water flow is not smooth, and the ice spreads to the evaporator.
Solution
Manually remove the ice, clean the dirt, and ensure that the water outlet is unobstructed.
2. Partial icing of air source heat pump evaporator
Reason
Mostly due to no frost at the defrost sensor and incorrect defrost point
Solution
It is necessary to manually force defrost and move the defrost sensor to the corresponding icing point of the equipment
3. Large-area frost and icing of air source heat pump evaporator
Reason
Defrost sensor, ambient temperature sensor failure or insufficient fluorine content in the equipment;
Solution
Manual forced defrost, replace sensor or add fluorine according to corresponding standards, weld it down to remove blockage
4. Air source heat pump equipment defrosts not cleanly and thoroughly
Reason
The defrost coil temperature is set too low, and the defrost is exited before the frost is completely melted; the defrost coil probe is incorrectly located, and there is no location where the frost is most severe
Solution
Adjust the defrost parameters, increase the defrost exit temperature appropriately, and adjust the defrost probe position to place it in the most severe frosting place
5. Frequent frost in a short period of time in the air source heat pump
Reason
The fin heat exchanger is dirty or blocked by foreign objects; the fan motor is damaged or the fan air volume is too small; the refrigerant charge is too small; the throttling expansion valve opening is too small; the fin heat exchanger area is too small.
Solution
Clean the heat exchanger or remove foreign objects; repair and replace the motor or replace the fan with a larger air volume; add refrigerant to the appropriate pressure; increase the expansion valve opening; negotiate with the manufacturer to replace the fin heat exchanger and increase the area.
Air source heat pumps will frost, don't be afraid, don't panic. Here are some simple treatment methods and common types of frost. Correct operation will help your heat pump resume work quickly.
1. Ice at the bottom of the air source heat pump
Reason
The water pan is blocked/the water flow is not smooth, and the ice spreads to the evaporator.
Solution
Manually remove the ice, clean the dirt, and ensure that the water outlet is unobstructed.
2. Partial icing of air source heat pump evaporator
Reason
Mostly due to no frost at the defrost sensor and incorrect defrost point
Solution
It is necessary to manually force defrost and move the defrost sensor to the corresponding icing point of the equipment
3. Large-area frost and icing of air source heat pump evaporator
Reason
Defrost sensor, ambient temperature sensor failure or insufficient fluorine content in the equipment;
Solution
Manual forced defrost, replace sensor or add fluorine according to corresponding standards, weld it down to remove blockage
4. Air source heat pump equipment defrosts not cleanly and thoroughly
Reason
The defrost coil temperature is set too low, and the defrost is exited before the frost is completely melted; the defrost coil probe is incorrectly located, and there is no location where the frost is most severe
Solution
Adjust the defrost parameters, increase the defrost exit temperature appropriately, and adjust the defrost probe position to place it in the most severe frosting place
5. Frequent frost in a short period of time in the air source heat pump
Reason
The fin heat exchanger is dirty or blocked by foreign objects; the fan motor is damaged or the fan air volume is too small; the refrigerant charge is too small; the throttling expansion valve opening is too small; the fin heat exchanger area is too small.
Solution
Clean the heat exchanger or remove foreign objects; repair and replace the motor or replace the fan with a larger air volume; add refrigerant to the appropriate pressure; increase the expansion valve opening; negotiate with the manufacturer to replace the fin heat exchanger and increase the area.
