At the end of the heating season, the air source heat pump needs necessary maintenance. If the heat pump is not maintained correctly, it is very easy to have serious threats such as water seepage and pipe corrosion during the long intermittent season.
The principle of air source heat pump maintenance is that the first step is to ensure cold protection in order to ensure safety performance; the second step is to avoid scale, including full water pressure maintenance and ensuring sealing; finally, do a good job of cleaning and maintenance, and discharge the scale, rust, and dirt in the terminal floor heating coil from the air source heat pump.
1. System inspection
After the air source heat pump has been running for the entire heating season, it is very likely that the hidden dangers of working pressure and structure have not been discovered. Given that the intermittent season is relatively long, especially the floor heating coil will not be opened until the winter of the following year, the air source heat pump is in the main machine off and unprotected state, so it is necessary to do a comprehensive inspection of the system to ensure the air source heat pump The sealing and safety performance, avoid water seepage, air intake and other problems during the intermittent period.
1) Observe whether the working pressure indication and thermometer are normal. The static pressure of the air source heat pump is generally 1.3-1.5ar, and the outlet water temperature is 45-60℃ according to the set temperature.
2) Check the tightness of the air source heat pump, including the water filter, manifold, water supply valve and other pipe joints and exposed pipe sections to see if there is water seepage or leakage.
3) Check the outdoor equipment, whether the main unit appearance and operation are normal, whether the installation location is low, whether there is a hidden danger of water ingress, and whether the water pump protection and pipe insulation are intact.
2. Shutdown/power outage of the heat pump host
There has been controversy about whether the air source heat pump host should be powered off. If the power is turned off but not disconnected, the heat pump host will still maintain basic functions such as cold protection and oil temperature, which will cause a small amount of operating costs. In the case of power outage, encountering wet and cold weather will cause the water in the pipeline and equipment to freeze, and the air source heat pump will be scrapped. Whether the power should be cut off actually depends on whether there is a risk of freezing, which should be further determined by the local temperature trend. The heating will end around March 15. If it is certain that the temperature will not drop below zero in the future, the main unit power supply should be cut off, otherwise the main unit should be kept powered on.
3. Water filter drainage
The filters in the air source heat pump include the pre-filter of the water supply valve, the filters of each branch of the manifold, the return water main filter, etc., which can flow the dirt inside the filter when the water flows through, ensuring the cleanliness of the circulating water. After a heating season, a lot of dirt has accumulated in the drainage pipes of each filter. It should be cleaned during the maintenance of the air source heat pump. The cleaning method is to open the screw cap of the Y-type filter drainage pipe, take out the filter, clean it and put it back. If a direct water supply air source heat pump is used, the air source heat pump water supply valve should also be opened to replenish the lost water.
4. Exhaust valve exhaust
In order to avoid air accumulation at the high point or local high point of the air source heat pump during the intermittent period, the manual exhaust valve needs to be exhausted before the air source heat pump is closed, and the automatic exhaust valve does not need manual exhaust. When exhausting manually, the system should be filled with water first, and when the water filling working pressure is constant, the water filling should be closed, and the air source heat pump automatic exhaust valve should be used to exhaust the gas. If a manual exhaust valve is used, the exhaust valve should be opened to exhaust the air when the system is filled with water until the air is exhausted and the discharged water does not contain bubbles.
At the end of the heating season, the air source heat pump needs necessary maintenance. If the heat pump is not maintained correctly, it is very easy to have serious threats such as water seepage and pipe corrosion during the long intermittent season.
The principle of air source heat pump maintenance is that the first step is to ensure cold protection in order to ensure safety performance; the second step is to avoid scale, including full water pressure maintenance and ensuring sealing; finally, do a good job of cleaning and maintenance, and discharge the scale, rust, and dirt in the terminal floor heating coil from the air source heat pump.
1. System inspection
After the air source heat pump has been running for the entire heating season, it is very likely that the hidden dangers of working pressure and structure have not been discovered. Given that the intermittent season is relatively long, especially the floor heating coil will not be opened until the winter of the following year, the air source heat pump is in the main machine off and unprotected state, so it is necessary to do a comprehensive inspection of the system to ensure the air source heat pump The sealing and safety performance, avoid water seepage, air intake and other problems during the intermittent period.
1) Observe whether the working pressure indication and thermometer are normal. The static pressure of the air source heat pump is generally 1.3-1.5ar, and the outlet water temperature is 45-60℃ according to the set temperature.
2) Check the tightness of the air source heat pump, including the water filter, manifold, water supply valve and other pipe joints and exposed pipe sections to see if there is water seepage or leakage.
3) Check the outdoor equipment, whether the main unit appearance and operation are normal, whether the installation location is low, whether there is a hidden danger of water ingress, and whether the water pump protection and pipe insulation are intact.
2. Shutdown/power outage of the heat pump host
There has been controversy about whether the air source heat pump host should be powered off. If the power is turned off but not disconnected, the heat pump host will still maintain basic functions such as cold protection and oil temperature, which will cause a small amount of operating costs. In the case of power outage, encountering wet and cold weather will cause the water in the pipeline and equipment to freeze, and the air source heat pump will be scrapped. Whether the power should be cut off actually depends on whether there is a risk of freezing, which should be further determined by the local temperature trend. The heating will end around March 15. If it is certain that the temperature will not drop below zero in the future, the main unit power supply should be cut off, otherwise the main unit should be kept powered on.
3. Water filter drainage
The filters in the air source heat pump include the pre-filter of the water supply valve, the filters of each branch of the manifold, the return water main filter, etc., which can flow the dirt inside the filter when the water flows through, ensuring the cleanliness of the circulating water. After a heating season, a lot of dirt has accumulated in the drainage pipes of each filter. It should be cleaned during the maintenance of the air source heat pump. The cleaning method is to open the screw cap of the Y-type filter drainage pipe, take out the filter, clean it and put it back. If a direct water supply air source heat pump is used, the air source heat pump water supply valve should also be opened to replenish the lost water.
4. Exhaust valve exhaust
In order to avoid air accumulation at the high point or local high point of the air source heat pump during the intermittent period, the manual exhaust valve needs to be exhausted before the air source heat pump is closed, and the automatic exhaust valve does not need manual exhaust. When exhausting manually, the system should be filled with water first, and when the water filling working pressure is constant, the water filling should be closed, and the air source heat pump automatic exhaust valve should be used to exhaust the gas. If a manual exhaust valve is used, the exhaust valve should be opened to exhaust the air when the system is filled with water until the air is exhausted and the discharged water does not contain bubbles.
