Domestic instantaneous gas water heating devices. Instantaneous household gas water heating devices Gas water heater VPG 18 1

The Neva 4511 household gas water heater (VPG-18 water heater) is designed to provide hot water apartments, country houses. This 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:

B – 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 Neva 4511 geyser

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

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.

Coefficient useful action- no less than 84%.

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

Mass flow rate of natural combustion products / 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

Geyser Neva 4511 wall type(see Fig. 1) has rectangular shape, formed by removable lining 4.

On front side The facings are located: 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 sizes

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 Neva 4511 gas water heater 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 the main components and parts of the gas water heater Neva 4511

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;

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.

Figure 3. Scheme of Neva 4511

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;

Maintenance and replacement of parts of the gas water heater Neva 4511

Repair operations on the Neva 4511 gas water heater (VPG-18 water heater), associated with dismantling its gas or water communications, must be performed only after it has been completely turned off (the taps on the water and gas lines in front of the device must be closed).

When dismantling and reassembling water and gas lines, it is recommended to install new seals. After replacing components and parts, it is necessary to reassemble in the reverse order.

Fig.A. Scheme of water heater VPG-18

1 - Frame, 2 - Heat exchanger, 3 - Gas burner (10 sections), 4 - Electronic control unit, 5 - Water-gas unit, 6 - Pipe (from the water unit to the heat exchanger), 7 - Pipe (hot water outlet), 8 - Facing, 9 - Cover, 10 - Handle, 11 - Battery compartment, 12 - Flame sensor, 13 - Display, 14 - Thermal relay, 15 - Candle, 16 - Water temperature sensor, 17 - Bar, 18 - Burner nozzle, 19 - Adapter, 20 - Bracket, 21 - Microswitch (water flow sensor), 22 - O-ring, 23 - Bracket, 24 - Bar, 25 - Clamp, 26 - Wire, 27 - Solenoid valve, 28 - Gasket (D19×d10×2 ), 29 - Gasket (D28×d17×1.5), 30 - Ring (D15×2.5), 31 - Water unit

Removing the lining of the gas water column Neva 4511

Remove handles 10 by pulling them towards you.

Unscrew the two self-tapping screws at the bottom of the product that fasten the cladding 8 to the frame bracket 1.

Disconnect the wires connecting the display to the electronic control unit and to the water temperature sensor.

Pull bottom part facing towards you, slide it up and remove it from the device.

Burner replacement

Remove the lining.

Unscrew the union nut of the burner manifold 3.

Unscrew the two screws securing burner 3 to frame brackets 1 and remove the burner.

Install a new burner.

Check the connections that were disassembled for leaks on a running device using the soaping method.

Check the operation of the new burner with the device running.

Replacing the heat exchanger

Unscrew the two self-tapping screws securing strip 17 to the gas exhaust device and remove it.

Unscrew the two union nuts from the fittings of heat exchanger 2 and remove it.

Install a new heat exchanger.

Check the connections that were disassembled while the device is running for leaks using the soaping method for gas and visual inspection for water.

Replacing the battery compartment

Remove the lining.

Disconnect the two conductors from the battery compartment 11.

Open the battery compartment cover.

Unscrew the two screws securing the battery compartment to the bracket and remove it.

Install a new battery compartment.

Fig.B. Disassembled water-gas water heater unit Neva VPG-18

21 - Microswitch (water flow sensor), 27 - Electromagnetic valve, 31 - Water unit, 32 - Spring, 33 - Gas valve, 34 - Bushing, 35 - Spring, 36 - Gasket, 37 - Ring D2.8×1.9 , 38 - Ring D8.8×1.9, 39 - Ring 17.4×2.65, 40 - Ring D27.5×2.65, 41 - Ring D29.5×1.8

Replacement of water-gas unit (WG)

Disconnect three wires from solenoid valve 27.

Disconnect the gas and water supply to the device.

Disconnect adapter 19 from water-gas unit 5.

Unscrew the four screws securing the water-gas unit to frame bracket 1 and remove the water-gas unit.

Install a new water-gas unit.

After installing and connecting the water-gas unit, check the gas and water connections for leaks. Water and gas leaks are not allowed.

Check the operation of the device with a new water-gas unit.

Replacing the valve of the water-gas solenoid unit

Remove the lining.

Disconnect the three wires from the solenoid valve 27 of the water-gas unit 5.

Unscrew the two screws securing the solenoid valve and remove it.

Install a new solenoid valve.

Check the functionality of the device with a new solenoid valve.

Rice. B. Neva 4511 water heater assembly

42 - Venturi fitting, 43 - Water flow regulator, 44 - Filter, 45 - Ring D7.8×2, 46 - Ring D11×1.5, 47 - Ring D11.4×d7.8, 48 - Ring D16.5 ×2.2, 49 - Ring D20.5×1.8, 50 - Membrane with plate (water unit repair kit).

Replacing the water hydrocarbon unit

Disconnect the water supply to the water-gas unit.

Disconnect the nut of the cold water outlet pipe to the heat exchanger 2 from the water unit 31.

Unscrew the two screws securing the water unit 31 to the body of the water-gas unit.

Unscrew the two screws securing the water unit 31 to the frame bracket 1 and remove it.

Install a new water unit.

Check connections for leaks. Water leakage is not allowed.

Check the operation of the device with the new water unit.

Replacing the thermostat (water overheating sensor)

Remove the lining

Disconnect the two wires from the thermostat 14 on the hot water outlet pipe 7.

Unscrew the two screws securing the thermal relay with clamp 25 and remove it.

Check the operation of the device with a new thermal relay.

Replacing the water temperature sensor

Remove the lining

Disconnect the two wires from the temperature display 13.

Unscrew the water temperature sensor 16 from the hot water outlet pipe 7.

Install a new sensor.

Check the operation of the geyser with the new sensor by comparing the water temperature readings on the display and the readings of the thermometer when measuring the temperature of hot water at the outlet of the device.

Replacing the cold water supply pipe to the heat exchanger

Unscrew the union nut from the water unit fitting.

Unscrew the union nut from the fitting of pipe 6 of heat exchanger 2 and remove the pipe together with gaskets 28.

Install new pipe with new gaskets.

Replacing the hot water outlet pipe from the heat exchanger

Disconnect the wires and remove the thermal relay 14 by unscrewing the screws of the clamp 25.

Unscrew the hot water temperature sensor 16.

Unscrew the two screws securing the fitting of the hot water outlet pipe 7 to the bracket on the rear wall of the frame 1.

Unscrew the pipe nut 7 from the heat exchanger pipe fitting 2 and remove the pipe.

Install a new pipe.

Check the operation of the device. Water leakage is not allowed.

Replacing the thermal relay (traction sensor)

Disconnect the wires from thermal relay 14.

Remove bracket 23 from thermal relay 14 with GOU by releasing the latch on the bracket.

Unscrew the two screws securing the thermal relay 14 to the bracket 23 and remove the thermal relay.

Install a new thermostat.

Check the operation of the device with a new thermal relay.

Replacement electronic unit management

Disconnect all external connecting wires and connectors of the electronic control unit 4.

Unscrew the two screws securing the electronic control unit to the bracket on the rear wall of frame 1 and remove it.

Install new block electronic control.

Check the operation of the VPG-18 water heater with a new electronic unit.

Replacing a spark plug or flame sensor

Disconnect the wires from the spark plug 12 and from the flame sensor 15.

Unscrew the two screws securing the strip 24 to the bracket 20 and remove it.

Replace the spark plug or flame sensor.

Check the operation of the device with new candle or a new flame sensor.

Replacing the microswitch (water flow sensor)

Remove the lining.

Disconnect the two wires from microswitch 21.

Unscrew the two screws securing the microswitch to the UVG and remove it.

Install a new microswitch.

Check the operation of the device with the new microswitch.

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. Cumulative 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 water heater domestic production. 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 automatic feeding 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. Astra geysers, according to buyers, are 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 market offers HSV model 8910-00.02, which is manufactured in Russia. Its power can reach 21 kW. The design is equipped open camera combustion 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 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. Minimum and maximum operating pressure the waters remain 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. On this product A two-year warranty is provided.

Technical characteristics of the geyser brand VPG 8910-16

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. Thermostat in this option 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 fuel consumption. 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 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.

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 to apartments and 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:

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;

Technical characteristics of the gas water heater 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 a rectangular shape formed by a 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).

Figure 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 – cold water supply fitting, G 1/2 thread; 7 – gas supply fitting, thread G 1/2; 8 – hot water outlet fitting, thread G 1/2; 9 – pipe of the gas exhaust device; 10 – mounting holes.

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

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 – rear wall; 23 – screws for fastening the cladding. Purpose of main components and components

; 23 – screws for fastening the cladding.

Purpose of the main components and parts of the gas water heater Neva 4511

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;

geyser Neva 4511, 4513

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

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.

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

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

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.

Water flow regulator 1 regulates the amount and temperature of water 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. R

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

OPERATION AND REPAIR OF BOILERS 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 HSV indicates thermal power device in kilowatts (kW). For example, VPG-23 is a flow-through gas water heating device with a thermal power of 23 kW. So the title modern speakers

does not define 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. Basic technical-23:

characteristics of HSV
thermal power - 23 kW;
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. Significant amount The HSV column has a heat exchanger consisting of one heater. The walls of the fire chamber in this case 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. Gas tap has a handle with a limiter that fixes 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 the 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 anchor, and with it the valve, in 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 bimetallic strip. 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. Cleaning surfaces with files, sandpaper, etc. is not allowed.

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.