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Analysis and treatment of heat exchanger work and original machine failure

Source : https://www.jialinmachinery.com Time : 2023-08-30 18:00:00 Clicks : 769

The heat exchange unit is a complete heat exchange station composed of heat exchanger, temperature control valve group, steam trap group (when the heat medium is steam), circulating pump, electric control cabinet, base, pipeline, valve, instrument, etc.

1. How to judge whether the heat exchanger is blocked?

If the pressure difference between the supply and return water on the primary side or the pressure difference between the inlet and outlet of the heat exchanger on the secondary side exceeds 0.15MPa, and the temperature of the secondary water supply is not hot, please check whether the heat exchanger is blocked. The inspection method is to remove and wash the heat exchanger.

2. What are the reasons why the system is not hot? How should it be analyzed?

The temperature of the secondary water supply is low and not hot. The reasons for the analysis are as follows:

Insufficient water supply flow at the primary side:

Check whether all the valves of the primary side water supply and return water pipelines are open.

Check whether the water supply filter is clogged.

If the valves are all open, judge the pressure difference of the supply and return water again. If the pressure difference is less than 0.05MPa, ask the heating company to increase the flow. If the pressure difference between the supply and return water on the primary side is greater than 0.15MPa, please clean the heat exchanger.

The secondary side system is not smooth:

Check whether all the valves of the water supply and return pipeline on the secondary side are open.

The pressure difference between the inlet and outlet of the secondary heat exchanger is higher than 0.15MPa, and the heat exchanger is blocked. Please clean the heat exchanger.

3. There is pressure in the system, but the pressure gauge shows 0, what’s the matter?

If the needle valve matched with the pressure gauge is closed, the pressure gauge will always display 0. During the operation of the system, ensure that all pressure gauge matching needle valves are fully open.

4. What is the secondary side overpressure? What about overpressure? How to prevent secondary system overpressure?

When the system is initially running, the secondary temperature is relatively low. After the water supply reaches a constant pressure value, as the temperature continues to rise, the pressure of the secondary system will also increase. At this time, one is to exhaust more, and the other is to drain. When draining, just open the drain valve of the secondary return pipeline. After the system temperature stabilizes, the pressure will not rise again.

5. How to judge whether the filter is blocked?

If the temperature difference between the primary water supply temperature and the primary return water temperature is large, the high temperature water exceeds 45 degrees, the low temperature water exceeds 30 degrees, and the secondary water supply is not hot, please check whether the filter at the primary water supply is blocked.

If the temperature difference between the secondary water supply temperature and the secondary return water temperature is large, the floor heating temperature difference exceeds 15 degrees, the radiator heating temperature difference exceeds 30 degrees, and the pressure difference is small, please check whether the filter at the secondary return water is blocked.

6. The fault indicator light of the unit is on, that is, the yellow indicator light on the control cabinet is on, what should I do?

When the fault indicator light is on, it means that the corresponding water pump is overloaded, the motor current exceeds the rated current, and the thermal relay plays a protective role. The release method is to press the reset button on the thermal relay to reset. Note that the reset must be done after the thermal relay has cooled down, otherwise the reset is invalid.

7. What’s the matter if the system cannot replenish water? The make-up pump keeps turning, but the pressure does not rise.

If the make-up pump keeps running, but the pressure never reaches the set point, vent the system. Most of the poor water replenishment is caused by the gas collection of the system.

8. What is the reason why the frequency conversion does not replenish water automatically and the frequency converter does not start?

Check whether the transfer switch is in the variable frequency or automatic position. The frequency converter can work normally only when it is in the variable frequency or automatic position.

Check whether the start button of the supplementary water pump is in the running state. Only when the green indicator light of the supplementary water pump is on, the frequency converter can work normally.

Check whether there is an alarm code on the operation panel of the inverter. The number starting with F is the fault code, and the number starting with R is the warning code. The warning code does not affect the operation of the inverter, but after the fault code appears, the inverter must be reset , the inverter can continue to work. If there is a fault code, please press the EXIT key on the upper left corner of the inverter operation screen.

The above three conditions must be normal, and the frequency conversion water replenishment can work normally.

9. What to do when the temperature of the secondary water supply is too high?

If the user feels that the water supply temperature is too high and the room is too hot, the best way is to turn off the water supply valve on the primary side. Please note that the water supply valve on the primary side must be turned off, and the return water valve is fully open.

10. What is the reason for the excessive noise of the water pump?

When the unit is running for one or two heating periods, the noise will become louder due to mechanical wear and tear. Check whether the fan cover is loose and exhaust the pump. The water pump must be maintained regularly, adding lubricating oil, replacing wearing parts and so on.

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