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Check the 7 items before starting the heat pump, and check the 10 items after starting the heat pump

With the coming of heating season, air source heat pump heating will start its own mission. But if you want to make the heat pump heating system run more stable in winter, or even make the service life of the system longer, it is better to do a "whole body check" for the whole system before use. So, which parts should be checked specifically? This article introduces the details to be checked in the air source heat pump host part.

Check these 7 items before starting the machine

1. Check whether each voltage is balanced.

If the voltage is too high or too low, the compressor will not start because the compressor has start protection. The voltage unbalance between phases shall be less than 2%, and the voltage shall be about 360-420v.

2. Check whether the unit voltage and electrical system wiring are firm.

It is mainly to determine whether there is any problem in the circuit, whether there is abnormal action of the electrical components, whether the leakage protector can operate effectively, etc. if there is any abnormality, it shall be repaired and replaced in time. If the power supply is normal and the wiring in the circuit is wrong, some parts of the system will not respond, such as the water pump does not turn, the wire controller and the operator do not light up, etc.

3. Check whether the safety protection device of the unit is disassembled or adjusted.

All the safety protection devices in the main engine are set before delivery, but sometimes the customer will adjust themselves due to some circumstances. For example, the system water pump is small, but it has been installed. Party A does not want to replace it, so the water flow switch is short circuited. In this way, if the time is long, it is easy to have high-voltage protection of the host.

4. Check the fluorine system for leakage.

It is to check whether there is oil stain on the pipeline joints and air charging valves in the machine. If there is oil stain, it means that there has been leakage before use. In this way, low-voltage protection will appear when the machine is turned on, or the heating effect of the host will be affected. If the refrigerant leaks, find the leakage point first, deal with the leakage point, and then check the pressure gauge to see if it needs to be supplemented.

5. Check the air outlet of the main engine for blockage or poor ventilation.

The unit shall be kept clean and dry around with good ventilation. If the air outlet is blocked or sundries are piled around the unit, the heat exchange capacity will be affected, and even the protection and shutdown of the main unit will be caused. When the ash on the evaporator fins is serious, it should be cleaned in time. Before cleaning the unit, turn off the main power supply of the unit.

6. Check whether the evaporator needs to be cleaned.

After a period of operation of the main engine, the fins will inevitably be blocked by dust and other debris, which will affect the heat exchange efficiency, reduce the heating effect and increase the energy consumption. So in general, the fin heat exchanger should be cleaned after 6-12 months of operation. When the surrounding environment is polluted seriously, the cleaning cycle should be shortened.

Cleaning method: first cut off the power supply of the unit, and then use high-pressure gas against the air inlet direction of the heat exchanger to repeatedly wash the fins. The washing direction is perpendicular to the fins to prevent the fins from falling back. It can also be washed with high-pressure water. When washing, it is necessary to control the water pressure, prevent fins from falling, and protect electrical components. If there is oily substance on fins, it is necessary to wash with water with neutral detergent. The cleaning effect is based on the fact that the primary color of fins or the water flowing down the fins is clear water.

7. Check whether the operation and safety protection setting parameters of the host have been changed.

Before the first heating, the manufacturer will adjust the parameters, but after running a heating season, Party A may misoperate and change some parameters. For example, the entry conditions of defrosting, the opening degree of thermal valve, whether the unit is under the control of inlet water temperature or return water temperature, etc. if the settings are not correct, the temperature operation of the system will be affected.

These 10 items need to be checked after startup

1. Check whether all parts of the main engine work normally.

Mainly check the compressor, sensor, expansion valve, etc.

2. Check whether the working pressure of the main engine system is normal.

Abnormal pressure is usually caused by fluorine system. Low pressure is generally fluorine leakage, high pressure is either fluorine system blocked, or water system blocked. In case of any abnormality, it shall be repaired and replaced in time.

3. Check whether there is abnormal noise and vibration when the main engine is running.

It is mainly to check whether the foundation of the unit is loose. If it is loose, the noise will be large. At this time, it should be fixed again. If there is any abnormal noise, confirm the noise source

4. Check whether the compressor has abnormal noise and vibration.

If there is a leak and the lubricating oil leaks a lot, the compressor will turn hard due to the lack of lubricating oil, which will produce abnormal noise. In addition, if the compressor is loose, it will also produce abnormal noise. In case of abnormal noise, it shall be handled according to different situations.

5. Check and record relevant operation data.

For example, the operating voltage and current data of compressor motor. Large commercial projects need to record operation data for later troubleshooting. If the system has faults or problems, these data can be used for judgment and troubleshooting. In addition, the operation data can be recorded to analyze the operation status and efficiency of the unit.

6. Check whether the host controller can operate normally.

For example, if the controller fails or not, if the controller is external, there are many failures. The connecting signal line may be damped, or the connecting line may be loose or damaged because the customer moves back and forth. If it is damp or damaged, it is necessary to replace the connecting wire with a new one.

7. After the main engine is started, carefully observe whether the compressor current is normal.

If the following faults are found, such as trip control circuit fault indication, etc., they can be started only after checking and finding out the cause. If the compressor exhaust temperature is too high, then