Views:248 Author:Site Editor Publish Time: 2020-09-28 Origin:Site
Air source DC inverter heat pumps have high requirements on design and installation, and some minor mistakes might bring problems during later operation. For that reason, we specially consulted the engineers who have a lot of experience in the design and installation of air to water heat pump systems to share practical experience with you for your reference.
In the installation of a DC inverter heat pump, many people may not pay attention to the water quality problem. In some areas, there are particularly many calcium and magnesium ions in the water. If they have been added to the system for one year or two years at most, it may cause blockage of pipelines, Y-type filters, water pumps, units, etc., and seriously affect the operation. In addition, a certain amount of antifreeze or alcohol should be added in areas with low temperature in winter.
Generally, antifreeze has instructions. For alcohol, 99 ° industrial alcohol is recommended. The amount of alcohol should be adjusted according to the actual situation and the circulating water volume in the system. For example, if the circulating water volume in the system is 100L, adding one kilogram of alcohol, and then the alcohol content of water is basically 1%. Thus, the freezing temperature of water is - 1 ℃. In many areas, the temperature is low in winter. If users don't switch off floor heating or there is long-time power failure at night, it is easy to bring about freezing problems to the pipeline or the unit, so it is necessary to add a certain amount of antifreeze or alcohol.
If there is no two-way ball valve, you will feel cold air coming out of the tuyere in some rooms when they are not in use, and the power consumption of the system will be slightly higher. Therefore, it is necessary to add two-way ball valves at the water outlet of the fan coils. In the whole system, if there are five or six fan coils, at least one of them should be equipped with a three-way ball valve.
Why does the system need a fan coil plus three-way ball valve? If only two-way ball valves are used, the water resistance in the system will be very high when only one or two fan coils are turned on, which will easily cause pipeline vibration and noise.
It is very important to select the type of water pump for the air source DC inverter heat pump system installed in home. Generally, a primary closed system is recommended. Because the pressure of each point in the primary closed system is equal, it is not necessary to consider the drop of the water pipe, but only the main force of the elbow and length of the pipe. Therefore, the canned motor pump or multi-stage centrifugal pump can be used instead of booster pump.
According to the experience of installation, because the booster pump has relatively high power and noise, the water resistance of the unit is about 4 meters, that of the fan coil is about 3.5 to 4 meters, and that of the elbow and water pipe is about 3 meters. Considering that the Y-shaped filter could be slightly blocked due to scaling or dirt in the later stage, it is recommended to select the best one. Choose the pump when the head is about 15 meters, the flow rate of which is three cubic meters per hour.
Whether we are installing a floor heating system or a hot water project, the indoor pipes, especially the pipes inside the ceiling layer, must be insulated. The condensate drainage pipe should be equipped with insulation cotton and be tied with tape to prevent leakage of condensate.
In the case that the location of the water tank is not easy to determine, we need to make a decision according to the site conditions. Of course, it is better if it can be installed at the top. But in some cases, it can only be installed on the ground or lower, so the exhaust problem should be considered in the system.
If the water tank is installed higher than the system pipeline, an automatic exhaust valve can be installed on the top of the water tank, because fan coils and floor heating have manual exhaust valves. If the position of the water tank is lower than that of the system pipeline, the automatic exhaust valve must be added to the buffer tank, and the automatic exhaust valve must also be installed at the top of the water inlet and return pipes of the system.
Otherwise, if air enters the pipeline, water resistance will be increased, and in serious cases, it will lead to air blockage and circulation failure.
The main pipeline of the whole system must be straight, and it is better to go up the slope slightly along the water flow direction. That is to say, the inlet pipe should be lifted slightly, and the return pipe should be slightly lowered, so as to facilitate the discharge of air in the pipeline. Moreover, the main pipe must not be U-shaped, which will cause air blockage. As a result, in-time soft connection won't even work.