How To Turn Off The Gas Boiler For Preservation: Step-By-Step Rules And Safety Requirements

Modern gas appliances are attractive because they do not require frequent repairs or any serious maintenance. All maintenance work is performed by representatives of the gas service, with which the homeowners conclude a contract. But when there is no need for heating or water heating, it is not difficult to turn off the boiler with your own hands, right?

Why not perform the procedure for turning off the equipment yourself, rather than pay for a call to a specialist? In this article, let's review all the subtleties of this process - consider information on how to turn off the gas boiler, while respecting the safety rules.

Specially for those who are used to doing household chores with their own hands, we offer 4 ways to preserve the boiler, which will reliably protect the heating system during downtime. After all, it is not enough to just dial a combination of buttons to turn off the unit - you need to properly preserve all connected equipment. Let's take a closer look at how best to do this.

Content of the article:

  • Causes of shutting down a gas boiler
  • Step-by-step instructions for shutting down
  • Methods for preserving gas boilers
    • Method #1 - dry stop
    • Method #2 - wet preservation option
    • Method #3 - gas preservation
    • Method #4 - applying excess pressure
  • What rules should be followed?
  • Conclusions and useful video on the subject

Causes of gas boiler shutdown

The gas boiler is the real \"heart\" of a private home. It provides the building with heat and, in case of the two-circuit models, also with hot water.

Thanks to electronic equipment the main processes - switching on, switching off, changing modes, adjusting temperature - take place automatically, without human intervention. The owner has to set the program by pressing the corresponding buttons or keys, depending on the manufacturer's instructions.

How to turn off the gas boiler for preservation: step-by-step rules and safety requirements

Gas boilers are preferred because of the cheapest fuel - gas. Solid fuel units or wood-burning stoves are more often installed if there is no gas line nearby

Switching off may be necessary for various reasons:

  • moving to another residence;
  • seasonal shutdown for warm periods;
  • emergency shutdown due to boiler breakdown and inability to repair or replace quickly;
  • scheduled shutdown for maintenance - removing deposits, flushing the internal circuit or cleaning soot;
  • connection of other heating or water heating equipment;
  • disabling one function - such as heating, etc.

The heating is most often switched off. In 1-circuit models the operation is stopped completely and in 2-circuit models only one line, the heating line, is shut off.

How to turn off the gas boiler for preservation: step-by-step rules and safety requirements

The 2-circuit models have 2 functions: heating and water heating. As hot water is also required in summer, the hot water circuit is left in operation and the HTW line is kept in normal operation

Many modern models have the option of switching over to summer operation. In this case the boilers are not put out of operation - they continue to operate the same way, maintaining an optimal temperature and keeping the system \"ready\" for an active start at any moment.

Summer, especially in northern regions, there are also cold snaps and even frosts, so the operating equipment proves useful.

Step-by-step instructions for switching off

If the gas burner does not ignite or goes out immediately after switching on, it often switches off automatically for unexplained reasons, pops occur, the water temperature in the circuit is not correct, an unusual noise is heard, water leaks in the case, pressure drops - the equipment must be turned off immediately.

How to turn off the gas boiler for preservation: step-by-step rules and safety requirements

If you smell gas when you enter the house, do not turn on any lights, electric appliances or light a fire. Immediately call the service company, turn off the equipment and turn off the gas

The procedure to turn off boilers is different, but the basic steps are similar.

Let's take the Baxi model as an example to show how to correctly and quickly shut down a gas boiler:

  1. Stop the fuel supply by turning the gas cut-off valve.
  2. Let the fan continue to operate for another 15 minutes.
  3. Turn off the fan, stop the smoke evacuation system.
  4. Wait until the temperature in the circuit is below +30°C, turn off the circulation pump.
  5. Disconnect the power by turning the switch to the \"Off\", \"0\" or other position indicated by the manufacturer.
  6. Maintain the boiler and associated equipment.

Not all systems completely drain the water. Some manufacturers recommend adding a fluid to the coolant that prevents the formation of lime deposits. The most effective for household communications are propylene glycol or antifreeze with special additives.

When force majeure situations occur one must quickly figure out how to quickly shut off the gas boiler, while keeping the system working and not harming themselves. Below we will consider particular cases.

Sometimes in case of overheating or lack of draught the boiler automatically shuts down. It stops working, respectively the heating of the house is stopped. If the automatic shut-off occurs very often, more than 5 times in 15 minutes, you should cut off the gas and contact the service department.

How to turn off the gas boiler for preservation: step-by-step rules and safety requirements

An automatic shut-off of gas appliances causes an error code to be displayed on the electronic display. In this case, you have to find this code in the manual and act according to the manufacturer's recommendations

Malfunctions in the smoke evacuation system also automatically stop the unit. It usually displays an error on the display and stops working for 12-15 minutes and then restarts. If the problem is not corrected during this time, it automatically shuts down again - and so on until the problem is corrected completely. To clean the gas exhaust duct, shut off the gas and turn off the boiler.

Many boilers are protected against freezing by automatic protection. The protection works if the boiler sensors are connected to the power supply, the system has normal pressure and the gas is not shut off.

In any fault, if the temperature of the heating medium in the circuit drops below + 8-10 °C (depending on the model), the operation of the unit is suspended. In the extreme case, if it is not possible to quickly cope with the circumstances - to turn on the boiler and set its functioning - you can try to drain the water so as not to rupture the pipes and parts of the unit.

Methods of preservation of gas boilers

See the main methods of preservation of heating equipment, but with one caveat - not all apply in the home service. Some of the methods are more suitable for equipment installed in manufacturing plants.

How to turn off the gas boiler for preservation: step-by-step rules and safety requirements

Home maintenance uses alkalis - caustic or soda ash. It is not recommended to use acid reagents by yourself, hydrochloric or sulphuric acid can only be used by qualified specialists

The process of conservation of the heating circuit is preceded by a preparatory stage including several points:

  • Disconnect the boiler from the gas main and the central water supply, install plugs. If water is supplied by a pumping station - stop the pump.
  • Remove water or other heat transfer fluid from the system.
  • Calcification cleaning of internal surfaces.
  • Rinse boiler parts and circuit.

Professional cleaning of calcium deposits can only be done by specialists - and the service provider has this service. The two easiest and most effective descaling methods are chemical, mechanical(manual cleaning), but the first is recognized as the most effective.

The internal parts of the boiler on which large deposits appeared are ground with an electric tool, and the scale in hard to reach places is removed manually, by brushes or scrapers.

Method #1 - dry shutdown

Dry shutdown is carried out at the plant, normally for maintenance work or during routine inspection, when shutdown is required for up to 30 days. It consists in removing all liquid from the equipment and pipes and in further drying them.

How to turn off the gas boiler for preservation: step-by-step rules and safety requirements

The procedure is called \"dry shutdown\". It applies to all models of boilers, regardless of pressure, but is contraindicated for units where the drums are connected to the piping by roll connections

The procedure:

  • Cooling the coolant naturally.
  • Stopping the boiler operation.
  • Displacing liquid at 0.8-1.0 MPa.
  • Drying system by natural means or ventilation.
  • Installing trays of desiccant in collectors - quicklime or calcium chloride in grains.
  • Closing the furnace and gas duct, plugs - complete sealing of the system.

Water is drained at home through special cocks installed at the bottom of the piping. Then repair or maintenance works are carried out and the equipment is left \"dry\" until the next heating season.

How to turn off the gas boiler for preservation: step-by-step rules and safety requirements

The drain cock refers to the shut-off valve, mandatory for installation when installing the heating system. The brass models chosen according to the diameter of the pipe are used most often

Filling of the circuits with the heating medium is done by means of a pump. The heating function can only be connected after the pipes have been completely filled with water, the circulation checked and diagnosed.

This method is only proper if the boiler operation is to be stopped for the winter or for a longer period.

Method #2 - Wet shut-down

Wet shut-down is used if the boiler has to be shut-down for a short period. The main purpose is to keep the equipment in working order, protect against corrosion, prevent oxygen from getting inside the circuit.

How to turn off the gas boiler for preservation: step-by-step rules and safety requirements

A special liquid that prevents rust formation is used to fill the pipes at home. This is available in concentrated or ready-to-use form in specialized stores

For regions with severe frost, fluids that do not freeze at low temperatures are used. For example, concentrated antifreeze is liquid down to -60 °С. To prevent the substance from thickening, it is diluted with water. But you must remember that the freezing temperature of water solution increases.

Antifreeze has some other drawbacks:

  • \"eats rubber;
  • has high fluidity;
  • does not tolerate overheating - turns to acid;
  • will be expensive.

In place of antifreeze use sodium sulphate solution at the rate of 10 gr/ liter of water. The liquid poured into the system is heated to displace the air, and then all openings are sealed hermetically. A pressure pump is used to pump the water into the system.

Method #3 - Gas Preservation

The gas preservation method is not used in private buildings as it requires special equipment and professional skills.

The idea is to pipe a gas which would not corrode if in contact with metal, unlike oxygen. This type of gas includes argon, ammonia, helium, nitrogen.

How to turn off the gas boiler for preservation: step-by-step rules and safety requirements

Some gases are dangerous to health and one could easily get burnt or poisoned without following safety procedures. All procedures are carried out strictly according to instructions and in protective clothing

The preservation process is complicated and carried out in several stages:

  • the system is flushed with deaerated water;
  • the gas cylinder and pressure monitor reducer are connected;
  • fill the circuit with gas displacing water;
  • the drain valve is closed;
  • at a reading of 0.013 MPa the gas supply is stopped;
  • the branch pipe is shut off, the cylinder is shut off.

The main condition for conservation with gas is the absence of air in the system , therefore the system tightness must be checked during the entire downtime.

Method #4 - positive pressure

The high pressure conservation technique is generally used in companies that have suitable conditions for it. It is used for hot water and steam installations.

How to turn off the gas boiler for preservation: step-by-step rules and safety requirements

The main task is to prevent oxygen from entering the system. To do this, the pressure inside the circuit is higher than atmospheric pressure, while replacing the normal coolant with deaerated water

The overpressure method is suitable if it is necessary to suspend the gas boiler operation for a small period, up to 10 days. Usually during this period repair work not related to the water heating equipment is carried out.

What rules must be observed?

Boiler preservation measures at the plant are governed by the requirements stated in RD 34.20.591-97  \"Guidelines for the preservation of heating and mechanical installations\".

The same rules should be observed by the owners of appliances installed in private homes.

How to turn off the gas boiler for preservation: step-by-step rules and safety requirements

If you are not sure of your knowledge or skills, contact the service organization. Specialists will perform the boiler shutdown and preservation work in accordance with all safety requirements

What you must remember if you decide to preserve the heating or hot water equipment yourself:

  • Before any repair work, the gas should be shut off. The main valve is installed at the gas inlet to the house.
  • Even the slightest oxygen ingress into the system will cause corrosion of boiler parts and piping, so you must choose one of the preservation methods and perform it strictly according to instructions.
  • When working with chemical reagents you must protect body parts with tight clothing, wear comfortable shoes, gloves and a mask.
  • In order to keep the pipes and components of the unit in working order, the dosage must be respected when diluting concentrated compounds and dry chemicals.
  • Working with explosive or flammable substances may only be carried out by specialists.
  • The power supply to additional equipment - such as a pump - must also be disconnected when work is finished.

The above rules must be observed to protect your own health and preserve the equipment.

After a long-term storage of the heating and hot water system it is necessary to de-pressurize, a process that also requires compliance with certain rules.

Conclusions and useful video on the subject

Some boilers are very easy to turn off:

On switching a modern model to summer mode and possible mistakes:

One way to dry the heating system:

If you go away from home for long, leaving the gas equipment without a prior shutdown is not allowed. In the absence of the owners, an unforeseen situation can occur that could deprive you not only of your heating system but also of your home. It is better to consult with experts beforehand how to turn off the heating and stop the gas boiler, and act according to the recommendations.

Skilled cleaning and preservation can also be carried out only by professionals. You can also shut it off automatically or set it to a more suitable mode yourself, following the manufacturer's instructions, but only if you are leaving home for a short period.

Do you have any questions when mothballing your gas equipment on your own? Ask for advice from our experts and other visitors to our website, take part in the discussion - the comment form below.

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