Scheme and structure of the gas column. Apparatuses water-heating flowing household gas Geyser vpg 18

"Astra" are produced Russian company"Heat exchanger". The company has been on the market for over 50 years. Astra columns are intended for hot water supply. They are used exclusively for natural gas. In this case, the products of combustion are quickly removed through the chimney. Previously, the company "Teploobmennik" was engaged in the production of water heaters of the KG series. However, today they are considered obsolete. Modern devices Astra series have a lot of advantages.

First of all, it is important to mention the large combustion chambers. The power of some models reaches 20 kW. Speaker performance varies. At the same time, their natural gas consumption is moderate. Models are quite easy to assemble. Chimneys on Astra gas water heaters are installed with a diameter of up to 120 mm. The average model on the market costs about 9 thousand rubles.

Parameters of the model "Astra 08" (HSV 8910)

The power of this column is 12 kW. If necessary, the user can adjust the thrust. Maximum temperature heating is exactly 60 degrees. The thermostat in this case is installed at the bottom. The smoke exhaust path of the model is quite wide. The burner at the presented column is located under the central fitting.

The model has a pressure regulator. The frame used is quite strong, and the load is able to withstand large. The manufacturer provides a separate container for the battery. He has a defense system. There is a special screw for adjusting the position of the clamping fitting.

Reviews about the device "Astra 08" (HSV 8910)

These Astra gas water heaters receive positive reviews. In this case, the consumption of natural gas is 2 cubic meters. meters per hour. With a power of 12 kW, this is considered normal. It is quite easy to check the thrust of the model. You can check the temperature if necessary. The pressure regulator is installed quite high quality. Combustion products are always removed quickly.

In general, this column is safe and does not pose a risk to human health. According to the owners, this Astra gas water heater has a strong frame. Detailed instructions are included in the standard kit. Many also point out low price for goods. To date, the user is able to purchase the model for 7 thousand rubles.

Possible malfunctions of "Astra 08" (HSV 8910)

The model uses a good burner, but the economizer under it can periodically fail. This often happens due to wiring problems. To repair the Astra gas column with your own hands, you first need to turn off the gas. In this case, there is no need to remove the device from the wall. To detach the front panel, you will have to use a screwdriver. The economizer is located behind the electrode.

In order to get to it, first of all, you should deal with the block. The electrode is fixed in this model with four screws. The heat exchanger in this case does not need to be touched. After removing the electrode, it is important not to touch the pressure measurement fitting. Otherwise, its head will have to be changed. Removing the economizer is pretty easy. To do this, it is necessary to unscrew only two screws, which are located on the left and right side. Next, you need to check his contacts. In some cases, they become dirty after prolonged use of the column. If this does not help, the economizer will have to be replaced. Then it must be installed again behind the electrode. If after that the Astra 8910 geyser does not light up, do-it-yourself repairs will not work.

Characteristics of the column "Astra 10"

This geyser "Astra" specifications has the following: the maximum power is 15 kW, and the maximum temperature is 65 degrees. Ignition in this case is carried out manually. If we talk about design features, then the burner is located at the adjusting screw. The model has a pressure gauge fitted. The thermostat is also included in the design. There is a separate container for the battery.

The model is located near the hydraulic group. The column is very compact in size. Gas connection is through a pipe with a diameter of 3.4 inches. In this case, the system withstands water pressure of 6 bar. Natural gas consumption is 2.1 cubic meters. meters per hour.

What do they say about the Astra 10 model?

The specified geyser "Astra" reviews from consumers deserve the most diverse. First of all, the owners appreciated the simplicity of the design. The thermostat of the model is convenient. If desired, the traction is adjustable. The system can withstand a lot of water pressure, so you don’t have to worry about the path. Also, a good economizer is installed at the column. provided simple. The user is able to purchase Astra gas water heaters of this series for 8200 rubles.

Repair column "Astra 10"

If the Astra geyser does not light up, you can try to figure out the cause of the breakdown yourself. To do this, remove the front cover, which is fixed with screws. After that, you will have to inspect the heat exchanger. If there is dirt on it, then it should be removed. Next, you have to disconnect the electrode. In this case, it is important to follow all safety rules and not risk health.

When making "Astra", the pressure measurement fitting cannot be touched. It can only be inspected by a master in a service center. However, the operation of the hydraulic group of the column can be checked independently. You will need to remove four screws to do this. In this model, the economizer is on the side, so you do not need to touch it. The burner itself should also not be inspected. To make sure that the hydraulic group is working, you should consider it gas valves. They must be firmly attached to the panel.

If there is dirt on them, it must be carefully removed. After that, the hydraulic group should be installed in its original place. Gas valves in this case should look at the rear panel. If the column does not turn on after the procedures performed, then the model will have to be handed over to service center for repair.

Characteristics of the device "Astra 15"

This Astra gas water heater has the following characteristics: the power of the model is 13 kW, and the productivity is 12 liters per minute at 25 degrees. The combustion chamber is provided open type. Ignition is carried out manually. Minimum temperature column allows you to maintain at 35 degrees. Natural gas consumption is 2.2 cubic meters per hour. Connection cold water carried out through a pipe with a diameter of 1.2 inches. The chimney in this case is provided for 120 mm. Weighs in assembled model exactly 15 kg.

Consumer opinion about the model "Astra 15"

The specified model receives mostly good reviews from buyers. The device of the Astra gas column pleases many, since the parts are of high quality. Also, the owners note high performance. The design of the model is simple. You can adjust the temperature if necessary. The water pressure system can withstand as much as 7 bar.

The chimney in the presented design is securely fastened. Also to this should be added a solid frame. The heating pad of the model is of high quality and breaks very rarely. It is also important to mention the thermostat, which is installed at the bottom of the column. He has a defense system. To date, these gas water heaters "Astra" are sold at a price of 8500 rubles.

Possible malfunctions "Astra 15"

In spite of positive reviews about the model, it periodically fails. If the Astra geyser does not light up, it is necessary first of all to determine the cause of the breakdown. You can make a superficial inspection of it only if you remove the front panel. To do this, you will need to use the key. After unscrewing the screws and removing the panel, you can directly inspect the heat exchanger.

In this model, it is located under the tract. The electrode in the device is of high quality, but periodically its contacts become dirty. In order to clean them, you will have to completely remove the box. It is fastened with screws, so you can’t do without a key in this situation. The model does not have a control valve. The control unit can only be inspected by specialists.

The last thing to check is only the hydraulic group. It is removed quite simply, but it will be problematic to fix it in its original place. This must be taken into account before removing the box. After disconnecting the hydraulic group, it is important to inspect the gas valves. If they are not firmly installed, then the part will have to be completely changed. You can do it yourself. To replace, you will have to purchase a similar hydraulic group. In this case, you only need to remember the column model and inform the seller about it.

Overview of the model "Astra 16"

The power of the model is 18 kW, and the productivity is as much as 14 liters per minute at a temperature of 25 degrees. In this case, the diameter of the chimney is 110 mm. Water pressure system can withstand no more than 5 bar. Natural gas consumption is about 2.1 cubic meters. meters per hour. The presented column weighs only 14 kg when assembled. Cold water is connected through a pipe with a diameter of 1.2 inches. The maximum heating temperature is 65 degrees. The combustion chamber at the column has an open type, and its ignition is carried out manually.

Overview of the gas column Neva 4511 VPG-18

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

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

AT - water heating apparatus,
P - flowing;
G - gas;
18 - nominal heat output, 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 gas column Neva 4511, 4513

It is intended for fast heating of 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 tapping points;

Technical characteristics of the 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

Inlet pipe diameter, mm - 19.17

Chimney diameter, mm - 122.6

Water heater control functions VPG-18

Management - Mechanical

Functions - Flame adjustment, Water flow adjustment, Auto ignition

Indication - Display

Indicators - Temperature indication

Operating parameters

Rated heat output - 18 kW.

Coefficient useful action- not less than 84%.

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

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

Type of ignition of the device - electronic.

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

Weight, kg - 10

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

On the front side linings are located: water flow adjustment knob 1, gas flow adjustment knob 2, water temperature display 3 and viewing window 5 for observing the burner flame. All main elements are mounted on back wall 22 (see fig. 2).

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

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

Figure 2. View of the gas column Neva 4511, 4513 without a casing

1 - water flow regulator; 2 – gas flow regulator; 3 - plate; 4 - water-gas unit; 5 - burner; 6 - fitting for supplying cold water; 7 - gas supply fitting; 8 - hot water outlet; 9 - gas outlet device; 10 - candle; 11 – flame presence sensor; 12 - heat exchanger; 13 - valve
electromagnetic; 14 - battery compartment; 15 - electronic control unit; 16 - thermal relay (traction 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.

The purpose of the main nodes and constituent parts geyser Neva 4511, 4513

The water-gas unit 4 is designed to control the gas supply to the burner, adjust the water flow and consists of water and gas units (the design of the unit provides 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 place of combustion;

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

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

The flame presence sensor 11 provides control of the burner;

The heat exchanger 12 ensures the transfer of the heat obtained by burning the gas to the water flowing through its pipes;

Thermal relay 16 (draft sensor) is designed to turn off the device in the absence of draft in the chimney;

The 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 gas column Neva 4511, 4513 when the water is heated above 90 ° C;

Plug 20 is used 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 high blood pressure water.

The working diagram of the water heater VPG-18 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 gas valve 30 opens with the membrane rod 25 and the contacts of the microswitch 17 close, after which the control unit 15 opens the solenoid valve 13 and begins to flow current pulses high voltage per candle 10.

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

The water flow regulator 1 regulates the amount and water temperature coming out of the machine: turning the knob counterclockwise increases the flow rate and lowers the water temperature; turning the knob clockwise decreases the flow and increases the water temperature.

The position of the regulator also determines the water flow at which the machine is switched on.

The gas flow regulator 2 adjusts the amount of gas entering the burner in order 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 the flow of water stops or when its flow rate decreases to less than 2.5 l / min, the contacts of the microswitch 17 open and valves 13 and 30 close. The burner goes out.

R Figure 3. Scheme of the gas column 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 outlet device; 10 - candle; 11 – flame presence sensor; 12 - heat exchanger; 13 - solenoid valve; 14 - battery compartment; 15 - electronic control unit; 16 - thermal relay (thrust 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 node; 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

Gas water heaters presented on our Russian market heating equipment are divided into two categories, according to the method of heating the coolant: instantaneous heating running water coming from the central water supply, and heating water in a capacitive tank from 50 to 200 liters, with periodic replenishment during use. According to the principle of heating household water heaters divided: capacitive and flow.

Scheme of operation of a flow gas column.

Scheme instantaneous water heater : 1 - heater, 2 - igniter, 3 - gas outlet cap, 5 - coil, 6 - burner, 7 - block valve.

Household gas from the pipeline is supplied to the main burner of the column, (hereinafter referred to as the injection burner). After combustion of the gas, the product of the emission carbon monoxide assigned to ventilation duct at home, to be removed into the atmosphere, his path lies through copper heat exchanger. During the passage through the heat exchanger, the high temperature of carbon monoxide is transferred to the flowing through the tubes tap water. So that the column body is not subjected to strong heat, the heat exchanger fins create a fire chamber around the heating pad, which is cooled from the outside by the same running water.

The main working components of the geyser are: the main burner, a copper radiator, an automatic gas and water part, a gas outlet.

We develop the theme: Device and malfunctions of instant gas water heaters PROTON

To increase efficiency in work, gas water heaters have been constantly improved. The burner was mainly upgraded. Previously, Soviet gas water heaters KGI used a multi-nozzle burner with one and only gas supply. However, these burners performed poorly in operation, as they had a very low injection coefficient (up to 0.5), plus they cannot be used when working on liquefied gas. Soon on gas HSV columns- 18 began to introduce a burner with a branched type gas supply (double). Low-pressure gas was supplied through a tee to two nozzles, which broke the flow and distributed it to two diffusers and further through distribution pipes for combustion.

Pipes for gas combustion are a metal box with numerous holes in the form of transverse slots. Gas-burner, equipped with this type of tubes, allowed the columns to work both on domestic natural gas and on liquefied gas. This burner had an injection coefficient of 0.7, which provided high heating and performance columns.

Scheme of operation of the gas-control system of the gas column.

In modern gas water heaters of domestic and foreign production, to control the work, functions have been introduced to protect the user from poisoning and the device itself from overheating. On the first Soviet columns, gas control was installed, which blocked the operation of the apparatus by sucking in an igniter instead of oxygen a large number of carbon monoxide. The igniter needs oxygen to burn. If the chimney is clogged, carbon monoxide accumulates around exhaust pipe. A suction tube is placed in this place (to this day, such a system is used in NEVA-3208 gas water heaters).

Over time, they began to implement automatic system control based on temperature readings near the chimney. Where a bimetallic sensor is placed instead of a tube (all modern speakers work according to this scheme). A thermocouple was placed in the zone of action of the pilot flame, which, when heated, became a sensor. driving force for solenoid valve. At one time, a solenoid valve controls the gas supply to the main burner.

Scheme and structure of the gas column.

The copper radiator serves to receive heat from the hot gas and transfer it to the water. The copper radiator of the column is also called the heat exchanger. The heat exchanger consists of two parts: a box - forming a fire chamber; heater - curved tubes with copper plates for receiving heat. The heat exchanger has two pipes: cold water inlet and hot water outlet to the taps. To heat up to the desired temperature, one circle of water around the heater is enough. The water receives all the heat through the tubes of the heat exchanger walls and carries it away to the consumer. The tubes are heated by the high temperature of the exhaust gases.

These water heaters (Table 133) (GOST 19910-74) are installed mainly in gasified residential buildings equipped with running water, but not having a centralized hot water supply. They provide fast (within 2 minutes) heating of water (up to a temperature of 45 ° C), continuously coming from the water supply.
According to the equipment of automatic and control devices, the devices are divided into two classes.

Table 133

Note. Devices of type 1 - with the removal of combustion products into the chimney, type 2 - with the removal of combustion products into the room.

Apparatus upper class(B) have automatic safety and regulation devices to ensure:

b) shutdown of the main burner in the absence of vacuum in
Chimney (apparatus type 1);
c) regulation of water flow;
d) regulation of the flow or pressure of gas (only natural).
All devices are provided with an externally controlled ignition device, and type 2 devices with an additional temperature selector.
First class devices (P) are equipped with automatic devices ignition, providing:
a) gas access to the main burner only in the presence of a pilot flame and water flow;
b) shutdown of the main burner in the absence of vacuum in the chimney (apparatus type 1).
The pressure of the heated water at the inlet is 0.05-0.6 MPa (0.5-6 kgf / cm²).
Appliances must have gas and water filters.
The devices are connected to water and gas pipelines using union nuts or couplings with locknuts.
Symbol of a water heater with a rated heat load of 21 kW (18 thousand kcal / h) with the removal of combustion products into the chimney, operating on gases of the 2nd category, the first class: VPG-18-1-2 (GOST 19910-74).
Flowing gas water heaters KGI, GVA and L-3 are unified and have three models: VPG-8 (flowing gas water heater); HSV-18 and HSV-25 (Table 134).

Rice. 128. Flowing gas water heater HSV-18
1 - cold water pipe; 2 - gas valve; 3 - ignition burner; 4-gas outlet device; 5 - thermocouple; 6 - solenoid valve; 7 - gas pipeline; 8 - hot water pipe; 9 - thrust sensor; 10 - heat exchanger; 11- main burner; 12 - water-gas block with a nozzle

Table 134

Indicators	Water heater model
Indicators	HSV-8	HSV-18	HSV-25
Thermal load, kW (kcal/h) Heat output, kW (kcal/h) Permissible water pressure, MPa (kgf/cm²)	9,3 (8000) 85	2,1 (18000) 18 (15 300) 0,6 (6)	2,9 (25 000) 85 25 (21 700) 0,6 (6)
Gas pressure, kPa (kgf / m 2): natural liquefied The volume of heated water for 1 min at 50 ° C, l Diameter of fittings for water and gas, mm Diameter of a branch pipe for removal of products of combustion, mm
Overall dimensions, mm;

Table 135. TECHNICAL DATA OF GAS WATER HEATERS

Indicators	Water heater model
Indicators	KGI-56	GVA-1	GVA-3	L-3
29 (25 000)	26 (22 500)	25 (21 200)	21 (18 000)
Gas consumption, m 3 / h;
natural	2.94	2,65	2,5	2,12
liquefied	-		-	0,783
Water consumption, l/mn, temperature 60°C	7,5	6	6	4,8
Diameter of a branch pipe for removal of products of combustion, mm	130	125	125	128
Connecting fitting diameter D mm:
cold water	15	20	20	15
hot water	15	15	15	15
gas Dimensions, mm: height	15 950	15 885	15	15
width	425	365	345	430
depth	255	230	256	257
Weight, kg	23	14	19,5	17,6

The Neva 4511 household gas water heater (HSV-18 water heater) is designed to provide apartments and country houses with hot water. It is a compact model with a digital display, reliable and easy to maintain, equipped with a complete set of security systems.

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

B - water heater
P - flowing;
G - gas;
18 - nominal heat output, 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 gas column Neva 4511

It is intended for fast heating of 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 tapping 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

Inlet pipe diameter, mm - 19.17

Chimney diameter, mm - 122.6

Water heater control functions VPG-18

Management - Mechanical

Functions - Flame adjustment, Water flow adjustment, Auto ignition

Indication - Display

Indicators - Temperature indication

Operating parameters

Rated heat output - 18 kW.

Efficiency - not less than 84%.

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

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

Type of ignition of the device - electronic.

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

Weight, kg - 10

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

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

Figure 1. Appearance and dimensions

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

Figure 2. View of the gas column Neva 4511 without a casing

Purpose of the main components and parts of the gas column Neva 4511

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

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

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

The flame presence sensor 11 provides control of the burner;

The heat exchanger 12 ensures the transfer of the heat obtained by burning the gas to the water flowing through its pipes;

Thermal relay 16 (draft sensor) is designed to turn off the device in the absence of draft in the chimney;

The 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 Neva 4511 when water is heated above 90°C;

Plug 20 is used 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 heater circuit from high water pressure.

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

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

The water flow regulator 1 regulates the amount and temperature of the water leaving the machine: turning the regulator counterclockwise increases the flow and reduces the water temperature; turning the knob clockwise decreases the flow and increases the water temperature.

The position of the regulator also determines the water flow at which the machine is switched on.

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

Figure 3. Scheme Neva 4511

Maintenance and replacement of parts of the gas column Neva 4511

Operations to repair the Neva 4511 gas column (HSV-18 water heater), associated with the dismantling of 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 disassembling and assembling water and gas communications, it is recommended to install new seals. After replacing the components and parts, it is necessary to assemble in the reverse order.

Fig.A. Scheme of the 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 - Overlay, 10 - Handle, 11 - Battery compartment, 12 - Flame sensor, 13 - Display, 14 - Thermal relay, 15 - Candle, 16 - Water temperature sensor, 17 - Strip, 18 - Burner nozzle, 19 - Adapter, 20 - Bracket, 21 - Microswitch (water flow sensor), 22 - O-ring, 23 - Bracket, 24 - Strap, 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 column Neva 4511

Remove handles 10 by pulling them towards you.

Unscrew two self-tapping screws in the lower part of the product, fastening the facing 8 with the frame bracket 1.

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

Pull the lower part of the lining towards you, slide it up and remove it from the device.

Burner replacement

Remove lining.

Loosen the union nut of the burner manifold 3.

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

Install a new burner.

Check for tightness of the joints that have been disassembled on the operating apparatus by soaping.

Check the operation of the new burner on a running machine.

Exchanger replacement

Unscrew the two self-tapping screws securing the bar 17 to the gas outlet 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 for tightness the joints that were disassembled on the operating apparatus by washing for gas and visual inspection for water.

Replacing the battery compartment

Remove 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. Knot water-gas water heater Neva VPG-18 disassembled

21 - Microswitch (water flow sensor), 27 - Solenoid valve, 31 - Water unit, 32 - Spring, 33 - Gas valve, 34 - Sleeve, 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 the water-gas unit (UVG)

Disconnect three wires from solenoid valve 27.

Disconnect the gas and water supply to the device.

Disconnect the adapter 19 from the water-gas unit 5.

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

Install a new water and gas unit.

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

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

Replacing the valve of the electromagnetic unit of the water-gas

Remove lining.

Disconnect 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 performance of the device with a new solenoid valve.

Rice. B. Neva 4511 water geyser 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 a plate (water unit repair kit).

Replacing the water unit of the UVG

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 tightness. Water leakage is not allowed.

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

Replacing the thermostat (water overheating sensor)

Remove the cladding

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 thermostat.

Replacing the water temperature sensor

Remove the cladding

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

Replacement of the cold water supply pipe to the heat exchanger

Unscrew the union nut from the fitting of the water unit.

Unscrew the union nut from the pipe fitting 6 of the 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 switch 14 by unscrewing the clamp screws 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 pipe nut 7 from heat exchanger pipe fitting 2 and remove pipe.

Install new pipe.

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

Replacing the thermal relay (draft sensor)

Disconnect wires from thermostat 14.

Remove the bracket 23 from the thermal relay 14 with the GOU by depressing 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.

Replacing the electronic control unit

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 the frame 1 and remove it.

Install a new electronic control unit.

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

Replacing the 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 bar 24 to the bracket 20 and remove it.

Replace spark plug or flame sensor.

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

Replacing the microswitch (water flow sensor)

Remove lining.

Disconnect 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 a new microswitch.

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