The most maintenance strategy for wall-hung boiler heating system!

 After a heating season, you want to ensure that the wall-hung boiler continues to be in its best condition for a long time? Take a look at maintenance and maintenance! I hope to be helpful!

Ⅰ、Under what circumstances need to maintain/maintain the boiler?

 

As the service life increases, the carbon deposits produced by high-temperature combustion, the accumulation of dust brought by the air in the wall-hung boiler, as well as factors such as scale, silt, and microorganisms in the waterway system, will affect the heat exchange and mechanical The moving parts have an adverse effect, which reduces the service life of the boiler and increases the failure rate. Therefore, in order to keep the wall-hung boiler in a good working condition and operate efficiently and economically, it is necessary to regularly maintain the equipment.

 

Due to the different models of wall-hung boilers selected by different users, the water quality, gas quality and air quality in different regions are also different, and the maintenance cycle is also different. Under normal circumstances, here is recommended:

1. Whether it is used or not, the wall-hung boiler should be inspected once a year;

2. Perform maintenance on the combustion and smoke exhaust related parts of the wall-hung boiler every full heating season;

3. Clean and maintain the sanitary and hot water related parts of the wall-hung boiler every 2 years;

4. Every 3 years of use, the wall-hung boiler heating components and the entire heating system are cleaned and maintained.

Ⅱ、What aspects should be paid attention to in the daily inspection of the boiler?

 

1. Check the pressure change of the heating system, pay attention to check whether the indication value of the "pressure gauge" on the operation panel is within the normal range (1bar～1.5bar).

Wall-hung boiler structure diagram

 

2. Check whether the air pipes, water pipes and pipe joints are firm and sealed.

 

3. Check whether the wall-hung boiler is leaking, leaking, whether the gas supply pipeline is normal and intact, whether there is aging, cracks, and pay attention to regularly replace the rubber tube.

 

4. During use, check whether the flame is normal and whether the exhaust pipe is off, damaged or blocked.

 

5. Check whether the power cord is loose, exposed or leaking, and check whether the leakage protection switch is normal.

 

6. During heating, since the wall-hung boiler is under fully automatic control, it is necessary to check the working conditions of the wall-hung boiler frequently, such as combustion conditions, heating water pressure changes, temperature changes and noise.

 

Ⅲ、Maintenance and operation method of wall-hung boiler

1、Maintenance of combustion exhaust parts

(1) Burner and nozzle cleaning

The impurities from the fan above the burner and the main heat exchanger will be deposited on the bottom of the boiler after being separated. When deposited on the surface of the burner, it will partially block the burner fire hole and reduce the combustion efficiency. Therefore, it is necessary to clean the surface of the burner and the impurities inside the nozzle regularly to prevent clogging to ensure normal combustion.

Method:Use a soft brush to clean the surface carbon of the burner. You can also place the burner under the faucet to clean it. Put the burner for a few minutes, drain the water and reinstall it back into the boiler.

 

Impurities on the burner

 

(2) Ignition electrode cleaning

Clean the surface carbon, observe whether the surface insulation is damaged, and adjust the discharge gap to 3mm～3.5mm.

Method:Use sandpaper to polish the surface of the ignition electrode to clean up carbon deposits (note that the angle and gap of the ignition electrode cannot be adjusted at will).

 

(3) Flue cleaning and repairing and fixing

Impurities in the air and flue gas, hiding of insects and small animals, etc. may block the flue. In addition, high winds, operating vibrations and other reasons or loose and disconnected flue connections will affect the normal combustion and exhaust of the wall-hung boiler. It must be cleaned and repaired. fixed.

Method:Loosen the flue connection clamp, remove the flue, rinse the flue with water, put the flue upright for a few minutes to drain the water, and check whether the rubber seal ring at the flue connection is intact. Before reinstallation, apply a little grease to the flue seal ring, connect the flue elbow and straight pipe in turn, and fix the clamp.

 

Wall-hung boiler flue

 

(4) Check the secondary gas pressure after the valve

The main purpose is to ensure that the secondary pressure is always maintained near the set value and to ensure the rated output power of the boiler.

 

2 Heat exchanger cleaning and maintenance

 

During use, due to impurities in the air, impurities in the gas, or insufficient combustion, the combustion products will mix with the moisture in the flue gas of the wall-hung boiler to form solid impurities, especially the low-temperature (floor heating) heating system will form more solid impurities. There are also impurities from the top of the main heat exchanger, the fan scattered on the surface of the heat exchanger, which gradually accumulates with the increase of use time, affecting the smoke exhaust and heat exchange efficiency, causing the wall-hung boiler at a rate of about 5% per year. The heat exchange efficiency drops and will corrode the heat exchanger, so the outside of the heat exchanger should be cleaned regularly.

Method:Use a copper brush to remove carbon deposits and impurities on the outer surface of the main heat exchanger to improve the air permeability and heat exchange efficiency of the heat exchanger.

 

3 Cleaning of fan and venturi

During the use of the boiler, the fan needs to continuously remove exhaust gas and introduce air from outside. Sufficient air is a necessary condition to ensure the efficient operation of the boiler. With the increase of air pollution, the solid particles in the air will adhere to the fan shell and the surface of the fan blade inside the fan when the air is introduced by the fan, and continue to accumulate and thicken.

Dust on the surface of the fan shell will affect the heat dissipation effect of the fan and cause failure; the accumulation of dust will also increase the load of the fan, resulting in insufficient air pressure, causing air pressure failure; it will also cause the impeller to run unbalanced, aggravate the bearing wear, and cause noise Big wait.

In addition, dust and impurities generated by combustion will block the pressure measurement hole of the venturi tube, affect the pressure difference measured by the wind pressure switch, or make the wall-hung boiler not work properly.

Method:Check the running noise of the fan, use a brush to clean the dust on the fan shaft. Never use lubricant to lubricate the fan shaft, otherwise it will damage the fan bearings.

 

4 Heating temperature sensor

In order to better and accurately detect the boiler heating water temperature, some boilers use embedded sensors. The temperature measurement probe of the sensor is deep inside the heat exchanger. When used in areas with a lot of scale, the scale adheres to the surface of the sensor probe, which will cause the sensor to measure Large temperature error causes unstable bathing water temperature and frequent high temperature protection.

Adhesion on the temperature sensor

Method:Wipe and clean the surface of the temperature sensor with a soft material. Be careful not to damage the coating on the sensor surface (when the sensor surface is scaled, sandpaper cannot be used for sanding). Use a multimeter to check whether the resistance value is normal (the measured resistance value is 10 thousand at 25 degrees) Europe).

 

5 Clean automatic bypass

Prevent foreign objects from jamming and inflexible movement.

Method:Use a soft brush to clean the surface of the spring, clean the surface of the bypass valve core, and clean the surface of the bypass valve body.

 

6 Expansion tank

If the pressure of the expansion tank is too low, it will cause frequent pressure relief and water replenishment. If the pressure is lower than 1 bar, it needs to be inflated to 1 bar.

Method:Loosen the connecting hose at the bottom of the expansion tank, and naturally empty the remaining water in the expansion tank; use a pressure gauge to check the pressure of the expansion tank airbag. If the expansion tank pressure is insufficient, connect an air pump with a pressure gauge to supplement the pressure. Stop after the pressure reaches 1 bar.

7 water pump

 

Confirm that the water pump can operate normally in each gear without abnormal jamming or noise.

Method:Use a sharp needle to clean the large particles of impurities that may exist in the pump blade guide groove; use a soft brush to clean the scale deposited on the pump impeller; use a soft brush to clean the scale deposited in the pump housing.

 

8 Heating pipeline and end cleaning

After the heating system has been used for 3 or 5 years, or when the user noticeably feels that the heating effect has deteriorated, and the gas cost of the wall-hung boiler has increased significantly, it is necessary to clean the heating pipeline and the end.

 

Filter and heating pipe block diagram

 

Method:Repeatedly circulate with a cleaning machine with special cleaning fluid to remove impurities and dirt attached to the pipe wall, and finally rinse it with clean water to restore heat dissipation capacity and reduce energy consumption.

 

heatcold boiler heating system

 

Postscript

 

The above is the common operation method for maintenance and maintenance of wall-hung boiler heating system. Good maintenance can not only improve the heat exchange efficiency of the system, reduce the use cost, but also reduce the failure rate, improve safety, and extend the service life of the equipment. It is very necessary and beneficial for the entire wall-hung boiler heating system. It is also suggested that the above operations should be carried out under the guidance of professionals, because in addition to the necessary cleaning, some professional tests on safety performance and other aspects are also required to ensure foolproof, safe and comfortable use.