Passport of the geyser VPG 18. Gas water heaters "Astra": technical characteristics and reviews. Technical characteristics of AGV water heaters

Review of the gas water heater Neva 4511 VPG-18

The household geyser Neva 4511, 4513 (water heater VPG-18) is designed to provide hot water apartments, country houses. This is a compact model with a digital display, reliable and easy to maintain, equipped with a full set of security systems.

Designation of the water heater VPG-18-223-V11-UHL 4.2, where:

IN - water heating apparatus,
P – flow-through;
G – gas;
18 – nominal heating capacity, kW;
223 – the device runs on natural and liquefied gases;
B11 – removal of combustion products through the chimney;
UHL 4.2 – climatic version.

Advantages of the geyser Neva 4511, 4513

Designed to quickly heat water;

Operates at low water pressure (0.10 Bar)

Automatic electronic ignition;

Compact overall dimensions;

Compact 2-tier heat exchanger;

Water-cooled combustion chamber;

Modern security systems;

Built-in temperature indicator;

1-2 water points;

Specifications geyser Neva 4511

Common parameters

Rated thermal power, kW - 21

Productivity, l/min - 11

Gas pressure (natural/liquefied) - 1.3/2.9 kPa

Nominal gas consumption (natural/liquefied), m3/hour - 2.2/0.8

Minimum water pressure - 30 kPa

Maximum water pressure, kPa - 1000

Type of communication supply - Lower

Diameter of the supply pipe, mm - 19.17

Chimney diameter, mm - 122.6

Control functions of the water heater VPG-18

Control - Mechanical

Functions - Flame adjustment, Water flow adjustment, Auto-ignition

Indication - Display

Indicators - Temperature display

Operating Parameters

Nominal heating capacity - 18 kW.

Efficiency factor - no less than 84%.

Gas group - 2nd; N/3rd; B/P.

Mass flow rate of combustion products of natural / liquefied gas at rated thermal power - 7.4 / 8.0 g/s.

The type of ignition of the device is electronic.

Device dimensions, Dimensions (WxHxD), mm - 290 x 565 x 221 mm

Weight, kg - 10

The wall-type geyser Neva 4511, 4513 (see Fig. 1) has rectangular shape, formed by removable lining 4.

On the front side of the cladding there are: water flow adjustment knob 1, gas flow adjustment knob 2, water temperature display 3 and viewing window 5 for monitoring the burner flame. All main elements are mounted on the rear wall 22 (see Fig. 2).

Picture 1. Appearance and dimensions of the geyser Neva 4511, 4513

1 – knob for adjusting water flow; 2 – gas flow adjustment knob; 3 – water temperature display; 4 – facing; 5 – viewing window; 6 – supply fitting cold water, thread G 1/2; 7 – gas supply fitting, thread G 1/2; 8 – outlet fitting hot water, thread G 1/2; 9 – pipe of the gas exhaust device; 10 – mounting holes.

Figure 2. View of the gas water heater Neva 4511, 4513 without casing

1 – water flow regulator; 2 – gas flow regulator; 3 – plate; 4 – water-gas unit; 5 – burner; 6 – cold water supply fitting; 7 – gas supply fitting; 8 – hot water outlet fitting; 9 – gas exhaust device; 10 – candle; 11 – flame presence sensor; 12 – heat exchanger; 13 – valve
electromagnetic; 14 – battery compartment; 15 – electronic control unit; 16 – thermal relay (draft presence sensor); 17 – microswitch (water flow sensor); 18 – water temperature sensor; 19 – thermal relay (water overheating sensor); 20 – plug for draining water; 21 – fitting for measuring gas pressure; 22 – back wall; 23 – screws for fastening the cladding.

Purpose of main components and components geyser Neva 4511, 4513

Water-gas unit 4 is designed to control the gas supply to the burner, regulate water flow and consists of water and gas units (the design of the unit ensures gas access to the burner only if there is a water flow);

Burner 5 is designed to create and supply an air-gas mixture to the combustion site;

The gas exhaust device 9 is designed to remove combustion products into the chimney;

Spark plug 10 is designed to create a spark discharge to ignite the burner;

The flame presence sensor 11 provides control of the burner operation;

Heat exchanger 12 ensures the transfer of heat obtained from gas combustion to water flowing through its pipes;

Thermal relay 16 (draft presence sensor) is designed to turn off the device if there is no draft in the chimney;

Water temperature sensor 18 is designed to determine the water temperature at the outlet of the apparatus;

Thermal relay 19 (water overheating sensor) is designed to turn off the Neva 4511, 4513 geyser when the water is heated above 90°C;

Plug 20 serves to drain water from the water circuit of the device to prevent it from freezing; The safety valve built into the plug is designed to protect the water circuit of the water heater from increased water pressure.

The working diagram of the VPG-18 water heater is shown in Figure 3.

When water begins to flow through the water unit 22 (see Fig. 3) with a flow rate of at least 2.5 l/min, the membrane rod 25 opens the gas valve 30 and the contacts of the microswitch 17 close, after which the control unit 15 opens the electromagnetic valve 13 and begins to flow high voltage current pulses to spark plug 10.

Burner 5 is ignited by spark discharges between the spark plug electrode and the nozzle of the burner section. Next, the operation of the burner is monitored by flame presence sensor 11.

The water flow regulator 1 regulates the amount and water temperature, leaving the device: turning the regulator counterclockwise increases the flow rate and reduces the water temperature; turning the knob clockwise reduces the flow rate and increases the water temperature.

The position of the regulator also determines the water flow at which the device turns on.

Gas flow regulator 2 regulates the amount of gas entering the burner to obtain the required water temperature at its set flow rate: turning the regulator counterclockwise increases the gas flow and water temperature; turning the knob clockwise reduces gas flow and water temperature.

When water flow stops or its flow rate decreases to less than 2.5 l/min, the contacts of microswitch 17 open and valves 13 and 30 close. The burner goes out.

R Figure 3. Diagram of the gas water heater Neva 4511, 4513

1 – water flow regulator; 2 – gas flow regulator; 3 – water temperature display; 4 – water-gas unit; 5 – burner; 6 – cold water inlet; 7 – gas inlet; 8 – hot water outlet; 9 – gas exhaust device; 10 – candle; 11 – flame presence sensor; 12 – heat exchanger; 13 – electromagnetic valve; 14 – battery compartment; 15 – electronic control unit; 16 – thermal relay (traction sensor); 17 – microswitch; 18 – water temperature sensor; 19 – thermal relay (water overheating sensor); 20 – plug for draining water; 21 – fitting for measuring gas pressure; 22 – water unit; 23 – water purification filter; 24 – water flow limiter; 25 – membrane; 26 – Venturi fitting; 27 – water outlet to the heat exchanger; 28 – gas unit; 29 – gas purification filter; 30 – gas valve; 31 – gas outlet to the burner.

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OPERATION AND REPAIR OF BOILERS

Despite the fact that today housing and communal services networks are being modernized everywhere, the quality of the services they provide remains at a low level. This is especially true for hot water supply. To solve this problem once and for all, you should purchase a gas water heater. However, you first need to decide which model is best for you.

Modern manufacturers offer the mentioned devices in wide range. They have certain operational and technical characteristics. Columns can be classified into flow-through and storage. As for the first ones, they are smaller in size, which allows them to be installed even in small room. Storage gas water heaters can hold from 50 to 500 liters of water.

The capacity in the design has effective thermal insulation, which allows you to save high temperature water for a long time, this helps to save energy resources. If you still can’t decide which geyser to choose, then you can pay attention to equipment under the Astra brand, which will be discussed below. Such devices are good not only because they are manufactured in Russia, which means they have an acceptable cost, but also because they are maintainable. This indicates that in the event of a malfunction, you can figure it out yourself.

Reviews of Astra brand geysers

If you want to save twice as much, you should purchase a domestically produced water heater. These are precisely the Astra geysers. Consumers choose them for their affordable price, but this advantage cannot be called the only one. The units operate on liquefied and natural gas. Buyers also like high level safety, which the manufacturer took care of. After all, if the pilot burner goes out, the supply of water for heating will stop, this also applies to the automatic supply of gas.

Such water heaters act as optimal solution For household use. Buyers also like the ease of operation and maintenance. You won't have to spend money on this. The appearance of the design is attractive, the body has a modern and stylish design. Any geyser from the manufacturer can fit into the interior of the room. Gas water heaters Astra, according to buyers, is offered for sale in a wide range. That's why you can choose the most best option, which will meet the requirements and preferences of the consumer.

Technical characteristics of VPG 8910-00.02

If you are interested in Astra geysers, then you should consider several models at once so that you have the opportunity to make right choice. Among others, the VPG 8910-00.02 model, which is manufactured in Russia, is presented on the market. Its power can reach 21 kW. The design is equipped with an open combustion chamber and manual ignition.

The hot water supply capacity is 12 l/min. The supplied water can have a temperature that varies from 35 to 60 °C. During operation, the column consumes natural gas in a volume equal to 2.3 m 3 /h. The maximum water pressure can be 6 bar. The lowest operating water pressure is equivalent to 0.5 bar.

Gas connection is carried out using communications that have the following parameters: 3/4 inch. Hot and cold water connections are made using pipes with a diameter of 1/2 inch. The chimney diameter reaches 120 mm. If you are considering Astra geysers, then you should definitely be interested in their dimensions. As for the model described in the section, its dimensions are 700x372x230 mm. The equipment weighs 15 kg.

Technical characteristics of the column brand VPG 8910-08.02

In order to make the right choice, you need to consider several models. Among others, the VPG 8910-08.02 variant is presented on the market, the power of which reaches 18 kW. The design has an open combustion chamber and manual view ignition The productivity of this model is slightly less and is 10 l/min. The temperature of the supplied water remains at the same level, but the fuel consumption will be slightly lower and amount to 2 m 3 / h. The minimum and maximum operating water pressure remains the same. The connection is made with the same parameters. The diameter of the chimney remains the same. The design body has identical parameters.

Technical characteristics of the geyser brand VPG 8910-15

This geyser "Astra 8910" has a power of 18 kW. Electric ignition is carried out from batteries. Water capacity is 10 l/min. Consumption natural gas is 2 m 3 / h. The diameter of the chimney in this case is slightly different, it is equivalent to 135 mm. This product comes with a two-year warranty.

Technical characteristics of the geyser brand VPG 8910-16

The power of this equipment reaches 21 kW. Electric ignition is carried out from batteries. The hot water output is slightly higher, it is 12 l/min. Natural gas consumption remains the same as the first of the models described above, this parameter reaches 2.3 m 3 / h. The chimney diameter is 135 mm. The equipment weighs 15 kg.

Why should you choose Astra geysers: reviews

Among the main advantages of the equipment described in the article, consumers highlight:

lack of unnecessary functionality;
reliability;
the ability to easily configure the operation of the equipment;
high productivity;
simple device;
ease of use.

The equipment, according to consumers, is repairable. All spare parts can be found in service workshops. And the column itself is quite cheap. Buyers especially like large combustion chambers, so the power of some models reaches 20 kW.

The traction control of the 8910 model is carried out independently. The thermostat in this version is located below. The smoke exhaust path is quite wide, but the column regulator is located under the central fitting. The frame of the structure, according to property owners who purchased such equipment for themselves, is very durable, so it can withstand any load.

The power supply has a protection system. Using special screws, you can easily adjust the fitting. The Astra geyser, the operating instructions for which is supplied, has, according to consumers, economical consumption fuel. The design has a high-quality pressure regulator. Traction can be checked very simply. Removal of combustion products occurs quickly. In terms of safety, the speaker outperforms other models.

Repair of Astra brand geyser

Repair of the Astra geyser begins with shutting off the gas. The column does not need to be removed. The front part can be dismantled using a screwdriver, but first you need to unscrew the bolts located on the sides. The first thing you need to check is the economizer; it is located behind the electrode. Removing the latter will be quite difficult. It is fixed with 4 bolts. You should not touch the heat exchanger.

When you repair individual components, it is important not to touch the fitting; it is used to measure pressure. If this part is damaged, the head will have to be replaced. In order to remove the economizer, you only need to unscrew the two side bolts. The consumer may well carry out the repairs with his own hands. The Astra geyser has contacts in its design that often become dirty. If they become unusable, they need to be replaced. If the economizer does not work after replacement, then it will also have to be changed. These faults are among the main ones for Astra speakers.

If you are faced with a problem when the Astra gas water heater does not light up, this may indicate a lack of draft in the ventilation passage. You can check the traction very simply. The gas water heater is turned off, and a burning match should be brought to the chimney outlet. If the flame is carried into the chimney, then everything is in order - you can connect the column. Otherwise, the chimney should be cleaned. However, it is better to entrust this matter to a special master.

The Astra geyser, the malfunctions of which you should consider when operating this equipment, sometimes goes out immediately after ignition. In this case, you should adjust the supply of cold water to the column. Do not try to dilute hot and cold water, as this may cause the flame to die out.

Spare parts for Astra brand gas water heater

If you purchased an Astra 8910 geyser, you may need spare parts for it during operation. You need to know what their cost is. For example, a water unit will cost 1,600 rubles. The gas part costs 1,500 rubles. The magnetic plug has more low price- 205 rub. The membrane costs 25 rubles. The repair kit for the water part costs 155 rubles, and the adjustment unit costs 55 rubles.

Conclusion

If you still don’t know whether it’s worth purchasing an Astra brand geyser, then you should consider its features in more detail. For example, the copper heat exchanger of all models has increased wall thickness. This ensures good heat transfer from heated gases to water, which allows for savings. For more convenient operation, the manufacturer has equipped the design with a display with which you can determine the temperature of the heated water.

The names of dispensers produced in Russia often contain the letters VPG: this is a water heating device (W), flow-through (P), gas (G). The number after the letters VPG indicates the thermal power of the device in kilowatts (kW). For example, VPG-23 is a flow-through gas water heating device with a thermal power of 23 kW. Thus, the name of modern speakers does not determine their design.

The VPG-23 water heater was created on the basis of the VPG-18 water heater, produced in Leningrad. Subsequently, VPG-23 was produced in the 90s at a number of enterprises in the USSR, and then - SIG. A number of such devices are in operation. Individual components, for example, the water part, are used in some models of modern Neva speakers.

Main technical characteristics of VPG-23:

thermal power - 23 kW;
productivity when heated at 45 °C - 6 l/min;
minimum water pressure - 0.5 bar:
maximum water pressure - 6 bar.

VPG-23 consists of a gas outlet, a heat exchanger, a main burner, a block valve and a solenoid valve (Fig. 74).

The gas outlet serves to supply combustion products to the smoke exhaust pipe of the column. The heat exchanger consists of a heater and a fire chamber surrounded by a cold water coil. The height of the VPG-23 fire chamber is less than that of the KGI-56, because the VPG burner provides better mixing of gas with air, and the gas burns with a shorter flame. A significant number of HSV columns have a heat exchanger consisting of a single heater. In this case, the walls of the fire chamber were made of steel sheet; there was no coil, which allowed saving copper. The main burner is multi-nozzle, it consists of 13 sections and a manifold, connected to each other by two screws. The sections are assembled into a single unit using coupling bolts. There are 13 nozzles installed in the manifold, each of which sprays gas into its own section.

The block tap consists of gas and water parts connected by three screws (Fig. 75). The gas part of the block valve consists of a body, a valve, a valve plug, and a gas valve cap. A conical insert for the gas valve plug is pressed into the housing. The valve has rubber seal by outer diameter. A cone spring presses on it from above. The safety valve seat is made in the form of a brass liner, pressed into the body of the gas part. The gas valve has a handle with a limiter that secures the opening of the gas supply to the igniter. The tap plug is pressed against the cone liner by a large spring.

The valve plug has a recess for supplying gas to the igniter. When the valve is turned from the extreme left position to an angle of 40°, the recess coincides with the gas supply hole, and gas begins to flow to the igniter. In order to supply gas to the main burner, the tap handle must be pressed and turned further.

The water part consists of the lower and upper covers, Venturi nozzle, membrane, poppet with rod, ignition retarder, rod seal and rod pressure bushing. Water is supplied to the water part on the left, enters the submembrane space, creating a pressure in it equal to the water pressure in the water supply. Having created pressure under the membrane, the water passes through the Venturi nozzle and rushes to the heat exchanger. The Venturi nozzle is a brass tube, in the narrowest part of which there are four through holes that open into an outer circular recess. The groove coincides with the through holes that are present in both water part covers. Through these holes, pressure from the narrowest part of the Venturi nozzle will be transferred to the supra-membrane space. The poppet rod is sealed with a nut, which compresses the fluoroplastic seal.

The water flow automation works as follows. When water passes through a Venturi nozzle, the narrowest part has the highest water speed and therefore the lowest pressure. This pressure is transmitted through through holes into the supra-membrane cavity of the water part. As a result, a pressure difference appears under and above the membrane, which bends upward and pushes the plate with the rod. The water part rod, resting against the gas part rod, lifts the valve from the seat. As a result, the gas passage to the main burner opens. When water flow stops, the pressure under and above the membrane is equalized. The cone spring presses on the valve and presses it against the seat, and the gas supply to the main burner stops.

The solenoid valve (Fig. 76) serves to shut off the gas supply when the igniter goes out.

When you press the solenoid valve button, its rod rests against the valve and moves it away from the seat, compressing the spring. At the same time, the armature is pressed against the core of the electromagnet. At the same time, gas begins to flow into the gas part of the block tap. After the igniter is ignited, the flame begins to heat the thermocouple, the end of which is installed in a strictly defined position in relation to the igniter (Fig. 77).

The voltage generated when the thermocouple is heated is supplied to the winding of the electromagnet core. In this case, the core holds the armature, and with it the valve, in the open position. The time during which the thermocouple produces the required thermo-EMF and solenoid valve begins to hold the anchor, is about 60 seconds. When the igniter goes out, the thermocouple cools down and stops producing voltage. The core no longer holds the armature; under the action of the spring, the valve closes. The gas supply to both the igniter and the main burner is stopped.

Automatic draft switches off the gas supply to the main burner and igniter if the draft in the chimney is disrupted; it works on the principle of “gas removal from the igniter.” Automatic traction control consists of a tee, which is attached to the gas part of the block valve, a tube to the traction sensor and the sensor itself.

Gas from the tee is supplied to both the igniter and the draft sensor installed under the gas outlet. The traction sensor (Fig. 78) consists of a bimetallic plate and a fitting secured with two nuts. The upper nut also serves as a seat for a plug that blocks the gas outlet from the fitting. A tube supplying gas from the tee is attached to the fitting with a union nut.

With normal draft, combustion products go into the chimney without heating the bimetallic plate. The plug is pressed tightly to the seat, gas does not escape from the sensor. If the draft in the chimney is disrupted, the combustion products heat the bimetallic plate. It bends upward and opens the gas outlet from the fitting. The gas supply to the igniter decreases sharply, and the flame stops heating the thermocouple normally. It cools down and stops producing voltage. As a result, the solenoid valve closes.

Repair and service

The main malfunctions of the VPG-23 column include:

1. The main burner does not light up:

low water pressure;
deformation or rupture of the membrane - replace the membrane;
Venturi nozzle is clogged - clean the nozzle;
the rod has come off the plate - replace the rod with the plate;
misalignment of the gas part in relation to the water part - align with three screws;
the rod does not move well in the oil seal - lubricate the rod and check the tightness of the nut. If you loosen the nut more than necessary, water may leak from under the seal.

2. When the water intake stops, the main burner does not go out:

Contaminants have gotten under the safety valve - clean the seat and valve;
the cone spring is weakened - replace the spring;
the rod does not move well in the oil seal - lubricate the rod and check the tightness of the nut. When the pilot flame is present, the solenoid valve is not held open:

3. Violation of the electrical circuit between the thermocouple and the electromagnet (break or short circuit). The following reasons are possible:

lack of contact between the thermocouple and electromagnet terminals - clean the terminals with sandpaper;
insulation failure copper wire thermocouple and short circuit it with the tube - in this case the thermocouple is replaced;
violation of the insulation of the turns of the electromagnet coil, shorting them to each other or to the core - in this case the valve is replaced;
disruption of the magnetic circuit between the armature and the core of the electromagnet coil due to oxidation, dirt, grease film, etc. It is necessary to clean the surfaces using a piece of rough cloth. It is not allowed to clean surfaces with needle files, sandpaper etc.

4. Insufficient heating of the thermocouple:

the working end of the thermocouple is smoked - remove soot from the hot junction of the thermocouple;
the igniter nozzle is clogged - clean the nozzle;
The thermocouple is incorrectly installed relative to the igniter - install the thermocouple relative to the igniter so as to ensure sufficient heating.

To heat water used for domestic purposes and in water heating systems, various water heaters are used: VPG-18-A, AGV-80 and AGV-120.

Flow-through gas water heater VPG-18-A, designed for continuous heating of running water, can be used for multi-point water supply. The water heater runs on natural and liquefied gases.

The VPG-18-A water heater is made in the shape of a parallelepiped, the outer surfaces of which are covered with white enamel. The main elements of the apparatus are the main and ignition burner, heat exchanger, gas burner unit, solenoid valve, thermoelectric thermometer, draft measuring transducer and piezoelectric ignition device. All elements of the device are mounted in a detachable casing, thanks to which you can freely inspect and repair its elements without removing the device from the wall.

There is a control knob on the front wall of the device gas tap, buttons for turning on the solenoid valve and piezoelectric ignition device. In the upper part of the device there is a device for discharging combustion products into the chimney, in the lower part there are pipes for connection to the water supply system and gas pipeline. Automatic devices ensure that the gas supply to the main burner is stopped if water does not flow to the device, if there is no draft in the chimney and if the pilot burner flame goes out.

Technical characteristics of the water heater VPG-18-A

VPG-18-A water heaters are installed in kitchens or bathrooms and secured using hooks or screws screwed into dowels embedded in a fireproof wall. If the water heater is mounted on a wooden plastered wall, then a 3 mm thick sheet of asbestos roofing steel is nailed to it behind the water heater.

Gas water heaters are installed at a distance of 970-1200 mm from the bottom of the housing to the floor. Water heaters are connected to the chimney by roofing steel pipes. The diameter of the pipe must be no less than the diameter of the pipe on the device for removing flue gases. The length of the vertical section of pipes above the draft breaker must be at least 0.5 m, and the horizontal section no more than 3 m in new houses and 6 m in previously built ones. The slope of the pipes is 0.01 towards the water heater.

The pipes are tightly pushed into one another along the gas flow by at least 0.5 D) (where D is the diameter of the pipe) and they must have no more than three turns with a radius of curvature of at least D. At a distance of 10 cm from the end of the pipe, a washer is installed that rests into the wall.

The water heater is installed like this: the installation location is marked, holes are marked and punched for dowels, which are embedded in the wall. Then they wrap it in dowel screws, hang the water heater and connect it to the gas and water connections.

Automatic gas water heaters type AGV are DHW water heaters, used for hot water supply systems and providing multi-point water supply. Such water heaters are installed in bathrooms, kitchens or rooms with a volume of at least 6 m 3 with a mandatory connection to a separate flue. Automatic gas water heaters AGV-80 and AGV-120 consist of the following main elements: galvanized welded tank, combustion chamber with burner, thermostat, magnetic gas valve, pilot burner, thermoelectric thermometer, safety valve and a traction breaker.

Casing 1 of the AVG-80 water heater (Fig. 244) is a cylinder made of sheet steel 1 mm thick and painted with enamel paint. Between the walls of the tank and the casing there is a 2¦ thermal insulation layer of slag wool.

Rice. 244. Automatic gas water heater AGV-80:
1 - casing, 2 - thermal insulation, 3 - water tank, 4 - cold water pipeline. 5 - flame tube, 6 - gas flow extension, 7 - drain fitting, 8 - tonka, 9 - gas burner, 10 - air supply regulator, 11 - firebox door, 12 - thermocouple, 13 - temperature regulator sensing element, 14 - tube igniter, 15 - thermocouple tube, 16 - burner tube, 17 - temperature control valve, 18 - button, 19 - solenoid valve, 20 - gas valve, 21 - plug valve, 22 - gas pipeline, 23 - hot water pipe, 24 - traction breaker

The cylinder tank with upper and lower bottoms is made of galvanized steel 3 mm thick. In the upper bottom there are two fittings with a diameter of 20 mm, one of them is used to connect pipelines 4 for cold water, the other 23 is for drawing hot water.

Water drains from the water heater through fitting 7.

Along the axis of the tank there is a flame tube 5 with a diameter of 80 mm, through which hot gases pass from the combustion chamber and heat the water. To increase heat transfer, a gas flow extension 6 is placed inside the flame tube. A draft breaker 24 is placed on top of the pipe. 8 In the firebox 8 of the water heater there is a gas burner 9 low pressure injection type. On the gas pipeline 22, as well as in front of the burner and igniter, plug valves 21 and gas valves 20 are installed. To maintain a constant water temperature, a sensitive element 13 of the thermostat is installed in the middle part of the water heater tank.

Gas enters the burner through solenoid valve 19, which is turned on when button 18 is pressed, and thermostat valve 17. Near the igniter tube 14 there is a thermoelectric thermometer tube 15 and a thermoelectric thermometer 12 with a bimetallic plate that regulates the passage of gas to the burner.

The water heater tank is constantly under pressure from the water supply. The ignition field of the burner is heat from its flame and hot gases passing through the flame tube heat the water.

When the water in the tank is heated to a predetermined temperature, the brass tube of the regulator's sensitive element lengthens and pulls back the rod of the regulator lever connected to it. The regulator levers are moved by a lever spring to another position and release the regulator valve. The valve closes under the action of its spring and the flow of gas through the regulator to the burner stops. The flame in the burner goes out, but the igniter burns because gas is supplied to it through the solenoid valve.

When the water in the tank cools below the set temperature, the regulator tube, cooling, shortens and presses the rod on the regulator lever. The regulator levers are moved by a lever spring to their original position and open the regulator valve. The gas flows through the solenoid valve and the regulator valve to the burner and is ignited by the igniter. If the igniter goes out, the thermoelectric thermometer will cool, the electric current in the circuit will disappear, the solenoid valve will close and stop gas access to the burner and igniter. To regulate the amount of air supplied to the burner 9, an air supply regulator 10 is used.

The device is also equipped with automatic draft and flame control, which stops the gas supply if there is no draft from the chimney or the pilot burner flame goes out.

Specifications AGV water heaters

When installing residential heating and hot water supply from the AGV-80 water heater (Fig. 245), the cold water pipeline is connected to the water heater through the lower drain fitting. On the water supply line they put check valve and valve and arrange a branch with a valve to drain water from the system. Hot water is directed through the upper fitting and riser into the expansion vessel, from which the upper hot line of the heating system is laid. The hot riser is insulated. To increase circulation pressure, it is recommended to install radiators at a height of 30-35 cm from the bottom of the device to the floor.

Rice. 245. Scheme of apartment heating and hot water supply from the gas water heater AGV-80:
1 - pipe to the chimney, 2 - safety line from the valve, 3 - pipeline to the heating system, 4 - pipeline from the heating system

The return line is connected to the lower drain fitting after the check valve. A drain pipe is led from the expansion vessel to the sink. A safety valve is installed on the hot riser, from which a pipe is laid to the washbasin or sink. Hot water is supplied to sanitary fixtures, as shown in the figure. For ease of ignition of the igniter and maintenance of the water heater, it is installed on a stand. When installing the water heater on a wooden floor, place it underneath steel sheet on asbestos cardboard.

To heat individual rooms with an area of 30 to 150 m2, heating devices AOG-5, AOGV-20, respectively, operating on natural and liquefied gas are used. The devices are made in the form of a rectangular cabinet (Fig. 246), the front surfaces of which are covered with white silicate enamel. The main elements of the apparatus are the combustion chamber, heat exchanger, burners (one or two), automatic device combustion safety, which provides control of the presence of a flame on the ignition burner and draft in the chimney and an automatic device for regulating the water heating temperature, which maintains its heating temperature within specified limits and, when the maximum is reached, turns off the gas supply to the main burner.