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The Beginner Guide for Air Source Heat Pumps

In recent years, the air-source heat pump market has been rapidly developing. However, many irregular operations have led to shortened service life and increased failure rates of the machines. What should be taken into account when using an air-source heat pump for house heating? You need to know these eight common questions and their respective answers.

 

Where should the air-water heat pump unit be installed?

The air-source heat pump continuously absorbs heat from a low-temperature source and transfers it to the heated water, thus raising the water temperature to the desired level. The higher the ambient temperature, the better the heating effect and the lower the energy consumption. Therefore, the heat pump unit should be installed in a location with abundant sunlight and good ventilation. In general, there should be at least 80 centimeters of clearance around the unit. If there are obstructions in front of it, it can affect the discharge of cold air, resulting in insufficient heat in the air and affecting heat exchange. Therefore, it is best to have no obstacles within 2 meters in front of the fan.

 

heat pump installation

How should the air-source heat pump house heating system be operated for the first time?

After starting the air-source heat pump unit, the initial heating temperature should not be set too high to avoid slow temperature increase and wall cracks. If the temperature is set too high, it is not conducive to the evaporation of water vapor inside the walls. Additionally, due to heat conduction between buildings, more energy will be consumed. Moreover, no matter how high the water temperature is set, it won’t help much; it will only shorten the heating time without raising the room temperature. After using it at a lower temperature for a week, the temperature can be appropriately increased.

 

How to assess the insulation condition of a house?

For example, if the indoor temperature is 18℃, place a thermometer inside the room. Turn off the air-source heat pump floor heating system for 12 hours and observe the temperature change. If the temperature drops by 1℃-2℃ during the day and 4℃-5℃ at night, it indicates good insulation. Otherwise, there may be air leaks, and a careful inspection is required.

 

Should an anti-freeze agent be applied in the air-source heat pump house heating system?

A certain amount of anti-freeze agent can be applied to the air-source heat pump floor heating system. Engineers can determine the appropriate proportion of anti-freeze agents based on the floor area. For users who do not add anti-freeze agents, the anti-freezing work of the unit during winter can be accomplished through the following method. To reduce the operating costs of the air-source heat pump floor heating system, low-temperature heating can be used when away from home during the day, and the temperature can be raised promptly after returning home.

 

What to do when the air-source heat pump house heating is turned off?

In winter, when the temperature is below 0℃, the heat pump unit may freeze. If you are not at home for a short period (3-5 days), you can turn off the unit, but do not disconnect the power supply. Most air-source heat pumps nowadays have self-defrosting functions, and automatic shutdown can achieve the anti-freezing function. When there is no one at home for a long time, all the water in the air-source heat pump floor heating system can be drained. Before performing this operation, please consider other indoor pipelines and promptly handle drainage issues. In the case of long-term non-use during summer, the system should be drained and the power supply should be disconnected.

 

How to drain after cleaning the filter?

To drain the system, close the cold water inlet valve, open the water injection valve, and open a sanitary hot water faucet. This will allow the heating water to be discharged. Reverse the operation to help replenish the system with water.

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Why can’t the temperature of the air-source heat pump house heating reach the desired level?

The heat dissipation capacity of the radiators is insufficient, which is more likely to occur when replacing radiators in a house. If the radiators are downsized, the heat emitted by the radiators may not be sufficient to compensate for the heat loss in the room.

 

The room is not dry. If the walls are damp, they need to vaporize the moisture before absorbing a significant amount of heat, making it difficult for the room temperature to rise.

 

The equipment frequently turns on and off. When the room temperature is imbalanced, the system shuts down, and the heat previously emitted is absorbed by the external environment through heat conduction between buildings. As a result, the desired temperature cannot be reached.

 

Understanding the correct energy-saving methods

In general, most users use air-source heat pumps when the temperature is low at night and may turn off the units during the day when not in use. However, this practice is actually very dangerous because the heat generated by the air-source heat pump unit relies on water. If the power supply is cut off in low-temperature conditions, the unit may be damaged by freezing. The correct approach is to set the temperature of the unit to the lowest when it is not needed, ensuring the frost protection function of the heat pump and effectively solving the problems of freezing damage and energy waste.

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