Household gas heating apparatus AOGV 17.4 3. Heating systems for country and country houses. Boilers, geysers, water heaters - Repair, service, operation. Recommendations for installation and assembly. Service and repair

Characteristics

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Characteristics

The floor-standing gas non-volatile single-circuit boiler ZhMZ AOGV-17.4-3 Universal N with an open combustion chamber is designed for heating residential, domestic, industrial and other premises with an area of ​​up to 140 sq.m. On the front side of this model there is a removable chute that covers the automation unit and the gas burner device. The advantage of the ZhMZ AOGV-17.4-3 Universal N boiler is the ability to work in systems with natural and forced air circulation, the boiler is compatible with any material from which the heating system is made (steel, cast iron, polypropylene, metal-plastic), as well as its operation does not depend on electricity and can be configured to run on natural or liquefied gas.

Peculiarities

• Equipped with an imported automation unit
• Has a compact design
• Adjusting the gas flow on the pilot burner
• The built-in gas pressure stabilizer ensures stable rated power of the boiler regardless of fluctuations in gas pressure in the network gas pipeline
• Smooth switching on and off of the main burner
• Classic cylindrical shape
• Stable operation at low gas pressure
• The flow-type heat exchanger is made of high-quality metal produced by NLMK
• The thickness of the heat exchanger steel in the burner area is 2.5 mm
• Screw turbulators are made of 2 mm thick steel and increase the boiler efficiency
• Equipped with gas valve EuroSit (Italy)
• Equipped with a dial thermometer and built-in piezo ignition
• For consumer convenience, the control is located at the top of the boiler
• Heating system coolant - softened water or household antifreeze
• Service life of at least 14 years

Specifications

Boiler type Gas

Mounting method Floor

Combustion chamber type Open

Thermal power, kW 17.4

Natural gas Yes

Liquefied gas Yes

Chimney diameter, mm 135

Steel

Non-volatile Yes

Manufacturer Russia

Boiler type Gas

Operating principle Convection

Number of circuits Single circuit

Mounting method Floor

Combustion chamber type Open

Thermal power, kW 17.4

Natural gas Yes

Liquefied gas Yes

Chimney diameter, mm 135

Primary heat exchanger material Steel

Non-volatile Yes

Manufacturer Russia

Power consumption, kW 17,4

Burner type Injection

Tank capacity, l 64

Ignition time, no more, sec 60

Overall dimensions (HxWxD), mm 1045-1055x415-425x475-485

Water pressure in the heating system, no more than, kPa 100

Diameter of heating pipes, inch G2

Diameter of gas supply fitting, inch G 3/4

Range of maintaining the coolant temperature in the heat exchanger, °C 50-90

Allowed leakage, no more than cc/h 70

Carbon monoxide index, no more, vol.% 0.05

Number of screw turbulators, pcs 8

Efficiency in heating mode, not less, % 88

Boiler weight (without packaging) no more, kg 49

Minimum/maximum pressure of natural gas, Pa (mm.water column) 635 (65)/1764 (180)

Minimum/maximum pressure of liquefied gas, Pa (mm.water column) 1960 (200)/3528 (360)

Minimum/maximum vacuum in the chimney, Pa (mm.water column) 2,94 (0,3)/29,4 (3,0)

Outer diameter of the connecting pipe of the gas exhaust device, mm 133-137

Nominal pressure of natural gas, Pa (mm.water column) 1274 (130)

Nominal pressure of liquefied gas, Pa (mm.water column) 2940 (300)

Heating of premises with heat loss no more than, kW 14.5

Area of ​​heated room height H=2.7 m, no more, sq.m 100-140

Distance from the floor to the end of the heat exchanger outlet pipe, mm 1045-1055

Distance from the floor to the axis of the gas pipeline inlet pipe, mm 711-721

Distance from the floor to the axis of the heat exchanger inlet pipe, mm 287-297

Natural gas consumption no more than, cubic m/h 1.87

Liquefied gas consumption no more than, cubic m/h (kg/h) 0,65 (1,3)

Ignition type Piezo ignition

High reliability

The safety of the boiler ZhMZ AOGV-17.4-3 Universal N is ensured by automatic operation, which is triggered when the flame on the igniter goes out, there is no draft in the chimney, the gas supply stops or the gas pressure drops below the permissible value, or the temperature of the coolant in the boiler tank rises above 93 - 100 °C. The pressure in the closed heating system in which the boiler can be used should not exceed 2.0 kgf/cm2. The boiler ZhMZ AOGV-17.4-3 Universal N has the ability to connect a boiler (purchased separately) to provide hot water.

floor-standing gas non-volatile single-circuit boiler with an open combustion chamber

About delivery

• Delivery is carried out on weekdays from 12:00 to 18:00 Moscow time
• Delivery outside the Moscow Ring Road is 50 rubles/km and is paid according to the actual distance traveled by the vehicle. We recommend finding out the exact distance using the Yandex.Maps service
• Delivery to a distance of more than 130 km from Moscow is carried out through transport and logistics companies
• Delivery on weekends, holidays, urgent delivery same day, order delivery at exactly the specified time is carried out at increased rates and after agreement with the store
• When the order is delivered by truck, the goods are unloaded by the Buyer
• Approximately 1 hour before delivery, the forwarder contacts the Buyer. If it is impossible to confirm the acceptance and delivery of the order to the designated address, delivery is canceled
• Pickup is carried out after the store confirms the movement of the goods to the point of delivery of the order.
• The forwarder does not provide advice on technical parameters and functional features of the goods, their compatibility, cost, etc. This information can be obtained by calling our office at contact numbers
• Our vehicles deliver orders along pre-planned routes according to a schedule that provides for high accuracy. Therefore, we ask you to understand that unloading, checking and payment for goods must be completed within 10-15 minutes

About payment

• We accept payment for goods only in rubles for cash or bank transfer
• The price of the goods includes a VAT rate of 20%
• The order is sent to the regions of the Russian Federation through transport companies to the Buyer only after 100% prepayment
• The exact cost of payment is calculated from the cost of goods and the cost of delivery (outside the Moscow Ring Road, for urgency, for the exact delivery time) of the order. Please take this into account

Installation

Our company’s specialists carry out a paid visit to the site, and the cost of the visit is returned upon conclusion of the contract; on the spot, they agree with you on the terms, stages and scope of work, and select equipment and components.

After concluding the Agreement and making an advance payment on time, delivery, installation and commissioning of equipment is carried out. Upon completion of the work, Certificates are drawn up and full payment is made.

Prices for visiting a specialist and installing equipment can be found here.

Service and repair

At your request, the company is ready to conclude an annual service agreement with you. The advantage is an extended warranty for work performed and preferential servicing of equipment.

If such an Agreement has not been concluded, you can contact the specialized service centers using the link.

PURPOSE

The device is intended for heat supply of residential premises and buildings for municipal purposes, equipped with water heating systems with a water column height in the water circuit of no more than 6.5 m.
The device is designed for continuous operation on natural gas in accordance with GOST 5542-87.
The device is manufactured in the UHL climatic version, category 4.2 according to GOST 15150-69.

SPECIFICATIONS

DEVICE AND PRINCIPLE OF OPERATION.

The device consists of the following components and parts: a heat exchanger tank, a main burner, an ignition burner unit with a thermocouple and an ignition electrode installed in it, a combined gas valve (multifunctional regulator), a draft stabilizer, and cladding parts.

In the upper part of the heat exchanger tank there is a thermostat sensor connected by a capillary tube to the actuator of the thermostatic valve (bellows-thermal balloon system) and a thermometer sensor

A special feature of the design of the 630 EUROSIT combination valve is the presence of a device for stabilizing the gas outlet pressure, as well as the combination of valve control in one handle with the designation of positions by the corresponding symbols and numbers at its end and an indicator on the valve cover. The dependence of the temperature of the heated water on the position of the control handle scale is presented below:

The operating principle of the temperature controller is based on the expansion of liquid when heated. The working fluid, heated in the sensor (thermal cylinder) from the water in the tank - heat exchanger, heated by the combustion of natural gas, expands and flows through the capillary tube into the bellows, which converts the volumetric expansion into linear movement of the mechanism that drives the system of two valves (instantaneous and metering). ). The design of the mechanism provides protection against thermal overload, which protects the bellows-thermal cylinder system from damage and depressurization.

1. When setting the required water temperature in the device using the control handle to increase, first the instantaneous (click) valve opens, then the dosing valve.
2. When the water temperature in the apparatus reaches the set value, the dosing valve smoothly closes, switching the main burner to the “low gas” mode.
3. When the temperature rises above the set value, the instantaneous (click) valve is activated, completely shutting off the gas to the main burner.
4. In the absence of draft in the chimney, the gases leaving the firebox heat the draft sensor, the sensor is triggered, opening the normally closed contacts of the thermocouple circuit. The electromagnetic (inlet) valve closes and blocks the access of gas to the main and ignition burners. The draft sensor is designed to be activated during a period of no draft for at least 10 seconds.
5. When the gas supply from the network is stopped, the pilot burner instantly goes out, the thermocouple cools down, and the solenoid valve closes, blocking gas access to the main and pilot burners. When the gas supply is restored, the passage through the apparatus is completely blocked.
6. When the gas pressure in the network decreases below 0.65 kPa, the gas pressure at the ignition burner will also drop, and the emf of the thermocouple will decrease to a value insufficient to hold the valve. The solenoid valve will close and block gas access to the burners.

PLACEMENT AND INSTALLATION

The placement and installation of the device, as well as the supply of gas to it, is carried out by a specialized construction and installation organization according to a project agreed upon with the operating enterprise (trust) of the gas industry.

The room where the device is installed must have free access to outside air and a ventilation hood near the ceiling.

The temperature of the room in which the device is installed should not be lower than +5 ºС.

The choice of location for installing the device should be made in accordance with the safety precautions set out in Section 7 of this passport.

The device is installed near fireproof walls at a distance of at least 10 cm from the wall.

1. When installing the device near a fire-resistant wall, its surface must be insulated with a steel sheet over an asbestos sheet with a thickness of at least 3 mm, protruding 10 cm beyond the dimensions of the housing. There must be a passage at least 1 meter wide in front of the device.
2. When installing the device on a combustible floor, the floor must be insulated with a steel sheet over an asbestos sheet with a thickness of at least 3 mm. The insulation should protrude 10 cm beyond the dimensions of the housing.

Before starting installation, it is necessary to depreserve the device and check the correctness of its assembly in accordance with Fig. 1 and fig. 8 of this passport, and make sure that all parts and assembly units are securely and completely secured.

Connect the device to the chimney, gas pipeline and heating system pipes. The connecting pipes of the pipelines must be precisely adjusted to the location of the inlet fittings of the device. The connection should not be accompanied by mutual tension between pipes and apparatus components.

SAFETY INSTRUCTIONS

Persons who have examined this passport are allowed to service the device.

Installation and operation of the devices must comply with the requirements of the “Rules for the design and safety of operation of hot water boilers, water heaters and steam boilers with excess pressure”, as well as the requirements of the “Safety Rules for Gas Distribution and Gas Consumption Systems. PB 12 - 529", approved by the State Technical Supervision Authority of Russia.

The operation of the devices must be carried out in accordance with the “Fire Safety Rules for residential buildings, hotels, dormitories, administrative buildings and individual garages PPB - 01 - 03”.

Operation of the device is only permitted with properly functioning automatic safety and thermal control.

Gas safety automatics must provide:

1. Reducing the gas supply when the water temperature in the heating system reaches the set value.
2. Shutting off the gas supply to the main burner when the set heating temperature is exceeded.
3. Turning off the gas supply to the device in the following cases:
   • when the gas supply to the device is stopped (within no more than 60 seconds);
   • in the absence of draft vacuum or in the boiler furnace (for a period of no less than 10 seconds and no more than 60 seconds);
   • when the pilot burner flame goes out (within no more than 60 seconds).

When operating the device, the hot water temperature should not exceed 95 °C.

Prohibited:

1. operate the device with the heating system partially filled with water;
2. use other liquids instead of water as a coolant**;
3. install shut-off and control valves on the supply line and pipeline connecting the heating system to the expansion tank;
4. operate the device if there is a gas leak through the gas pipeline connections;
5. use an open flame to detect gas leaks;
6. operate the device if there is a malfunction of the gas network, chimney or automation;
7. independently eliminate malfunctions in the operation of the device;
8. make any design changes to the apparatus, gas pipeline and heating system.

When the device is not working, all gas valves: in front of the burner and on the gas pipeline in front of the device, must be in the closed position (the valve handle is perpendicular to the gas pipeline).

Any malfunctions when operating the device on gas must be immediately reported to the emergency service of the gas operating company.

If gas is detected in the premises, you should immediately stop supplying it, ventilate all premises and call emergency or repair services. Until the malfunction is eliminated, it is prohibited to light matches, smoke, or use

** It is allowed to use household coolant “Olga” (manufacturer: ZAO Organic Products Plant) according to the instructions for use. After a period of operation, the coolant must be drained and disposed of.

PURPOSE

The device is intended for heat supply of residential premises and buildings for municipal purposes, equipped with water heating systems with a water column height in the water circuit of no more than 6.5 m.
The device is designed for continuous operation on natural gas in accordance with GOST 5542-87.
The device is manufactured in the UHL climatic version, category 4.2 according to GOST 15150-69.

 (See the connection diagram in this device passport)

SPECIFICATIONS

DEVICE AND PRINCIPLE OF OPERATION.

The device consists of the following components and parts: a heat exchanger tank, a main burner, an ignition burner unit with a thermocouple and an ignition electrode installed in it, a combined gas valve (multifunctional regulator), a draft stabilizer, and cladding parts.

In the upper part of the heat exchanger tank there is a thermostat sensor connected by a capillary tube to the actuator of the thermostatic valve (bellows-thermal balloon system) and a thermometer sensor

A special feature of the design of the 630 EUROSIT combination valve is the presence of a device for stabilizing the gas outlet pressure, as well as the combination of valve control in one handle with the designation of positions by the corresponding symbols and numbers at its end and an indicator on the valve cover. The dependence of the temperature of the heated water on the position of the control handle scale is presented below:

The operating principle of the temperature controller is based on the expansion of liquid when heated. The working fluid, heated in the sensor (thermal cylinder) from the water in the tank - heat exchanger, heated by the combustion of natural gas, expands and flows through the capillary tube into the bellows, which converts the volumetric expansion into linear movement of the mechanism that drives the system of two valves (instantaneous and metering). ). The design of the mechanism provides protection against thermal overload, which protects the bellows-thermal cylinder system from damage and depressurization.

1. When setting the required water temperature in the device using the control handle to increase, first the instantaneous (click) valve opens, then the dosing valve.
2. When the water temperature in the apparatus reaches the set value, the dosing valve smoothly closes, switching the main burner to the “low gas” mode.
3. When the temperature rises above the set value, the instantaneous (click) valve is activated, completely shutting off the gas to the main burner.
4. In the absence of draft in the chimney, the gases leaving the firebox heat the draft sensor, the sensor is triggered, opening the normally closed contacts of the thermocouple circuit. The electromagnetic (inlet) valve closes and blocks the access of gas to the main and ignition burners. The draft sensor is designed to be activated during a period of no draft for at least 10 seconds.
5. When the gas supply from the network is stopped, the pilot burner instantly goes out, the thermocouple cools down, and the solenoid valve closes, blocking gas access to the main and pilot burners. When the gas supply is restored, the passage through the apparatus is completely blocked.
6. When the gas pressure in the network decreases below 0.65 kPa, the gas pressure at the ignition burner will also drop, and the emf of the thermocouple will decrease to a value insufficient to hold the valve. The solenoid valve will close and block gas access to the burners.

PLACEMENT AND INSTALLATION

The placement and installation of the device, as well as the supply of gas to it, is carried out by a specialized construction and installation organization according to a project agreed upon with the operating enterprise (trust) of the gas industry.

The room where the device is installed must have free access to outside air and a ventilation hood near the ceiling.

The temperature of the room in which the device is installed should not be lower than +5 ºС.

The choice of location for installing the device should be made in accordance with the safety precautions set out in Section 7 of this passport.

The device is installed near fireproof walls at a distance of at least 10 cm from the wall.

1. When installing the device near a fire-resistant wall, its surface must be insulated with a steel sheet over an asbestos sheet with a thickness of at least 3 mm, protruding 10 cm beyond the dimensions of the housing. There must be a passage at least 1 meter wide in front of the device.
2. When installing the device on a combustible floor, the floor must be insulated with a steel sheet over an asbestos sheet with a thickness of at least 3 mm. The insulation should protrude 10 cm beyond the dimensions of the housing.

Before starting installation, it is necessary to depreserve the device and check the correctness of its assembly in accordance with Fig. 1 and fig. 8 of this passport, and make sure that all parts and assembly units are securely and completely secured.

Connect the device to the chimney, gas pipeline and heating system pipes. The connecting pipes of the pipelines must be precisely adjusted to the location of the inlet fittings of the device. The connection should not be accompanied by mutual tension between pipes and apparatus components.

SAFETY INSTRUCTIONS

Persons who have examined this passport are allowed to service the device.

Installation and operation of the devices must comply with the requirements of the “Rules for the design and safety of operation of hot water boilers, water heaters and steam boilers with excess pressure”, as well as the requirements of the “Safety Rules for Gas Distribution and Gas Consumption Systems. PB 12 - 529", approved by the State Technical Supervision Authority of Russia.

The operation of the devices must be carried out in accordance with the “Fire Safety Rules for residential buildings, hotels, dormitories, administrative buildings and individual garages PPB - 01 - 03”.

Operation of the device is only permitted with properly functioning automatic safety and thermal control.

Gas safety automatics must provide:

1. Reducing the gas supply when the water temperature in the heating system reaches the set value.
2. Shutting off the gas supply to the main burner when the set heating temperature is exceeded.
3. Turning off the gas supply to the device in the following cases:
   • when the gas supply to the device is stopped (within no more than 60 seconds);
   • in the absence of draft vacuum or in the boiler furnace (for a period of no less than 10 seconds and no more than 60 seconds);
   • when the pilot burner flame goes out (within no more than 60 seconds).

When operating the device, the hot water temperature should not exceed 95 °C.

Prohibited:

1. operate the device with the heating system partially filled with water;
2. use other liquids instead of water as a coolant**;
3. install shut-off and control valves on the supply line and pipeline connecting the heating system to the expansion tank;
4. operate the device if there is a gas leak through the gas pipeline connections;
5. use an open flame to detect gas leaks;
6. operate the device if there is a malfunction of the gas network, chimney or automation;
7. independently eliminate malfunctions in the operation of the device;
8. make any design changes to the apparatus, gas pipeline and heating system.

When the device is not working, all gas valves: in front of the burner and on the gas pipeline in front of the device, must be in the closed position (the valve handle is perpendicular to the gas pipeline).

Any malfunctions when operating the device on gas must be immediately reported to the emergency service of the gas operating company.

If gas is detected in the premises, you should immediately stop supplying it, ventilate all premises and call emergency or repair services. Until the malfunction is eliminated, it is prohibited to light matches, smoke, or use

** It is allowed to use household coolant “Olga” (manufacturer: ZAO Organic Products Plant) according to the instructions for use. After a period of operation, the coolant must be drained and disposed of.

Recently, gasification of populated areas in Russia has been proceeding at a fairly intensive pace. The main element of equipment that is installed in every rural house is a gas boiler. The author of this material shares his experience in repairing the automation of the gas boiler AOGV - 17.4-3, popular in rural areas, produced by the Zhukovsky Mechanical Plant.

Purpose and description of the main components of the AOGV - 17.3-3.

The appearance of the heating gas boiler AOGV - 17.3-3 is shown in rice. 1, and its main parameters are given in the table.

Construction of a gas boiler AOGV - 17.3-3

Its main elements are shown in rice. 2 . The numbers in the figure indicate: 1 - draft breaker; 2 - traction sensor; 3 - traction sensor wire; 4 -start button; 5 -door; 6 -gas magnetic valve; 7 -adjusting nut; 8 -tap; 9 -storage tank; 10 -burner; 11 -thermocouple; 12 - igniter; 13 - thermostat; 14 -base; 15 - water supply pipe; 16 - heat exchanger; 17 -turbulator; 18 - bellows unit; 19 - water drainage pipe; 20 - traction breaker door; 21 -thermometer; 22 -filter; 23 -cap.

The boiler is made in the form of a cylindrical tank. On the front side there are controls that are covered with a protective cover. Gas valve 6 (Fig. 2) consists of an electromagnet and a valve. The valve serves to control the gas supply to the igniter and burner. In the event of an emergency, the valve automatically turns off the gas. Traction breaker 1 serves to automatically maintain the vacuum value in the boiler furnace when measuring the draft in the chimney. For normal operation the door 20 should rotate freely on the axis without jamming. Thermostat 13 designed to maintain a constant temperature of water in the tank.

The automation device is shown in rice. 3 . Let us dwell in more detail on the meaning of its elements. Gas passing through a cleaning filter 2, 9 (Fig. 3) goes to the solenoid gas valve 1 . To the valve using union nuts 3, 5 draft temperature sensors are connected. The igniter is ignited when the start button is pressed 4 . There is a setting scale on the body of thermostat 6 9 . Its divisions are graduated in degrees Celsius.

The desired water temperature in the boiler is set by the user using the adjusting nut 10 . Rotation of the nut leads to linear movement of the bellows 11 and rod 7 . The thermostat consists of a bellows-thermal bulb assembly installed inside the tank, as well as a system of levers and valves located in the thermostat housing. When the water is heated to the temperature indicated on the dial, the thermostat is activated and the gas supply to the burner is stopped, while the igniter continues to operate. When the water in the boiler has cooled down to 10 ... 15 degrees, the gas supply will resume. The burner lights up from the pilot flame. While the boiler is operating, it is strictly forbidden to regulate (reduce) the temperature with the nut 10 - this may cause the bellows to break. The temperature on the dial can be reduced only after the water in the tank has cooled to 30 degrees. It is prohibited to set the temperature on the sensor above 90 degrees - this will trigger the automation device and turn off the gas supply. The appearance of the thermostat is shown in (Fig. 4) .

How does the AOGV gas boiler turn on?

Actually, the procedure for turning on the device is quite simple, and besides, it is described in the operating instructions. And yet, let’s consider a similar operation with a few comments:

— open the gas supply valve (the valve handle should be directed along the pipe);

- press and hold the start button. In the lower part of the boiler, a hissing of escaping gas will be heard from the igniter nozzle. Then light the igniter and after 40...60 and release the button. A similar time delay is necessary to warm up the thermocouple. If the boiler has not been used for a long time, the pilot light should be lit 20...30 s after pressing the start button. During this time, the igniter will fill with gas, displacing the air.

Possible malfunctions of the AOGV gas boiler

After releasing the start button, the igniter goes out. A similar defect is associated with a malfunction of the boiler automation system. Please note that operating the boiler with the automation switched off (for example, if the start button is forcibly jammed while pressed) is strictly prohibited. This can lead to tragic consequences, since if the gas supply is briefly interrupted or if the flame is extinguished by a strong air flow, gas will begin to flow into the room.

To understand the reasons for the occurrence of such a defect, let’s take a closer look at the operation of the automation system. In Fig. Figure 5 shows a simplified diagram of this system.

The circuit consists of an electromagnet, a valve, a draft sensor and a thermocouple. To turn on the igniter, press the start button. The rod connected to the button presses on the valve membrane, and gas begins to flow to the igniter. After this, the igniter is lit.

The pilot flame touches the body of the temperature sensor (thermocouple). After some time (30...40 s), the thermocouple heats up and an EMF appears at its terminals, which is sufficient to trigger the electromagnet. The latter, in turn, fixes the rod in the lower (as in Fig. 5) position. The start button can now be released.

The traction sensor consists of a bimetallic plate and a contact (Fig. 6). The sensor is located in the upper part of the boiler, near the pipe for exhausting combustion products into the atmosphere. If a pipe is clogged, its temperature rises sharply. The bimetallic plate heats up and breaks the voltage supply circuit to the electromagnet - the rod is no longer held by the electromagnet, the valve closes and the gas supply stops.

The location of the automation device elements is shown in Fig. 7. It shows that the electromagnet is covered with a protective cap. The wires from the sensors are located inside thin-walled tubes. The tubes are attached to the electromagnet using union nuts. The body terminals of the sensors are connected to the electromagnet through the housing of the tubes themselves.

Let's consider the method for finding the above fault.

Check during gas boiler repair they start with the “weakest link” of the automation device - the traction sensor. The sensor is not protected by a casing, so after 6...12 months of operation it becomes “overgrown” with a thick layer of dust. Bimetallic plate (see Fig. 6) oxidizes quickly, which leads to poor contact.

The dust coat is removed with a soft brush. Then the plate is pulled away from the contact and cleaned with fine sandpaper. We should not forget that it is necessary to clean the contact itself. Good results are obtained by cleaning these elements with a special “Contact” spray. It contains substances that actively destroy the oxide film. After cleaning, apply a thin layer of liquid lubricant to the plate and contact.

The next step is to check the serviceability of the thermocouple. It operates in severe thermal conditions, since it is constantly in the flame of the igniter; naturally, its service life is significantly shorter than other elements of the boiler.

The main defect of a thermocouple is burnout (destruction) of its body. In this case, the transition resistance at the welding site (junction) increases sharply. As a result, the current in the Thermocouple - Electromagnet circuit.

The bimetallic plate will be below the nominal value, which leads to the fact that the electromagnet will no longer be able to fix the rod (Fig. 5) .

How to check the thermocouple of an AOGV boiler

To check the thermocouple, unscrew the union nut (Fig. 7) located on the left side of the electromagnet. Then turn on the igniter and use a voltmeter to measure the constant voltage (thermo-EMF) at the thermocouple contacts (Fig. 8) . A heated, serviceable thermocouple generates an EMF of about 25...30 mV. If this value is less, the thermocouple is faulty. To final check it, disconnect the tube from the electromagnet casing and measure the resistance of the thermocouple. The resistance of the heated thermocouple is less than 1 Ohm. If the resistance of the thermocouple is hundreds of Ohms or more, it must be replaced. The appearance of a thermocouple that failed as a result of burnout is shown in rice. 9 . The price of a new thermocouple (complete with tube and nut) is about 300 rubles. It is better to purchase them at the manufacturer’s store or use the services of an authorized service center. The fact is that the manufacturer is constantly improving its products. This is reflected in the parameters of self-made parts. For example, in the AOGV-17.4-3 boiler of the Zhukovsky plant, starting from 1996, the length of the thermocouple connection has been increased by approximately 5 cm (that is, similar parts produced before or after 1996 are not interchangeable). This kind of information can only be obtained from a store (authorized service center).

A low value of thermo-EMF generated by a thermocouple can be caused by the following reasons:

— clogging of the igniter nozzle (as a result of this, the heating temperature of the thermocouple may be lower than the nominal one). They “treat” such a defect by cleaning the igniter hole with any soft wire of a suitable diameter;

— shifting the position of the thermocouple (naturally, it may also not heat up enough). Eliminate the defect as follows - loosen the screw securing the liner near the igniter and adjust the position of the thermocouple (Figure 10);

- low gas pressure at the boiler inlet.

If the EMF at the thermocouple terminals is normal (while the symptoms of malfunction indicated above remain), then check the following elements:

— integrity of contacts at the connection points of the thermocouple and draft sensor.

Oxidized contacts must be cleaned. The union nuts are tightened, as they say, “by hand.” In this case, it is not advisable to use a wrench, since you can easily break the wires suitable for the contacts;

- integrity of the electromagnet winding and, if necessary, solder its terminals.

The functionality of the electromagnet can be checked as follows. Disconnect the thermocouple line. Press and hold the start button, then light the igniter. From a separate DC voltage source, a voltage of about 1 V is applied to the released electromagnet contact (from a thermocouple) relative to the housing (at a current of up to 2 A). For this, you can use a regular battery (1.5 V), the main thing is that it provides the necessary operating current. The button can now be released. If the igniter does not go out, the electromagnet and draft sensor are working;

- traction sensor

First, check the force of pressing the contact against the bimetallic plate (with the indicated signs of malfunction, it is often insufficient). To increase the clamping force, release the lock nut and move the contact closer to the plate, then tighten the nut. In this case, no additional adjustments are required - the clamping force does not affect the response temperature of the sensor. The sensor has a large margin of plate deflection angle, ensuring reliable breaking of the electrical circuit in the event of an accident.

It is not possible to light the igniter - the flame flares up and immediately goes out.

There may be the following possible reasons for such a defect:

- the gas valve at the boiler inlet is closed or faulty,
— the hole in the igniter nozzle is clogged, in this case it is enough to clean the nozzle hole with soft wire;
— the igniter flame is blown out due to strong air draft;

The gas supply is turned off when the boiler is running:

- the draft sensor is triggered due to a clogged chimney, in this case it is necessary to check and clean the chimney;
— the electromagnet is faulty, in this case the electromagnet is checked according to the above method;
- low gas pressure at the boiler inlet.

AOGV-17.4-3 Comfort floor-mounted gas boiler is designed for electrically independent autonomous heating systems for houses and dachas with an area of ​​up to 140 sq.m. The devices are used in heating systems with natural (open) and forced (closed) coolant circulation. The pressure in a closed heating system should be no more than 1.5 kgf/sq.cm.

The heating system coolant is household antifreeze such as Hot Blood, Dixis, Warm House-65.

The devices operate on natural gas; when replacing nozzles (main burner and igniter) - on liquefied (cylindered) gas.

Heat exchanger

High efficiency of boilers (up to 89%), ensured by the tubular design of the heat exchanger with built-in turbulators;

High reliability of the heat exchanger tank due to the use of an automatic welding process and seamless seamless pipes;

Stable supply of hot water for domestic needs in a copper flow-through secondary circuit;

Possibility of using boilers in heating systems with natural and forced circulation of coolant.

Automation

Safety, reliability, simplicity and ease of operation of boilers is ensured by the use of modern Russian automation units;

Saving gas consumption due to automatic burner power modulation mode in boilers with imported automatic equipment;

Ease of control due to the optimal location of automation units.

Burner

Environmental cleanliness due to the low content of nitrogen and carbon oxides in the exhaust gases;

Stable operation of the boiler at low gas pressure in the network (up to 550 Pa);

Ease of use due to the easy process of replacing and cleaning the burner.

Boiler design and packaging

Protective external coating of the boiler with white powder enamel;

Boilers are cylindrical and rectangular in shape, automation is located at the top or bottom;

The boilers are equipped with a dial thermometer and piezo ignition;

Modern convenient packaging of the boiler.