Geyser electron vpg 23 instruction. Gas flowing water heaters. Review questions

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

The VPG-23 water heater was created on the basis of the VPG-18 water heater manufactured in Leningrad. Later, the 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 units, for example, the water part, are used in some models of modern Neva columns.

Main technical characteristics of VPG-23:

thermal power - 23 kW;
productivity when heated to 45 ° С - 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 valve block and an electromagnetic valve (Fig. 74).

The gas outlet is used to supply combustion products to the flue gas outlet of the column. The heat exchanger consists of an air heater and a fire chamber, surrounded by a coil cold water... The height of the VPG-23 fire chamber is less than that of 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 HPG columns have a heat exchanger consisting of one air heater. The walls of the fire chamber in this case were made of steel sheet, the coil was absent, which made it possible to save copper. The main burner is multi-nozzle, it consists of 13 sections and a manifold, connected by two screws. The sections are assembled into a single whole with tie bolts. The manifold has 13 nozzles, each of which blows gas into its own section.

The block valve 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, a gas valve cover. A tapered liner for the gas valve plug is pressed into the body. The valve has a rubber seal on the outer diameter. A cone spring presses on it from above. The safety valve seat is made in the form of a brass insert pressed into the body of the gas part. The gas valve has a handle with a limiter that fixes the opening of the gas supply to the igniter. The valve plug is pressed against the tapered liner by a large spring.

There is a groove on the valve plug for gas supply to the igniter. When the valve is turned from the extreme left position by an angle of 40 °, the groove 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, a Venturi nozzle, a membrane, a plate with a stem, an ignition retarder, a stem oil seal and a stem clamping sleeve. Water is supplied to the water part on the left, enters the under-membrane space, creating a pressure in it equal to the water pressure in the water supply system. After creating pressure under the membrane, the water flows 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 go into the outer circular groove. The recess is aligned with the through holes in both water end covers. Through these holes, the pressure from the narrowest part of the venturi nozzle is transferred to the supra-membrane space. The poppet stem is sealed with a nut that compresses the PTFE packing.

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

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

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

The voltage generated during the heating of the thermocouple is applied to the winding of the electromagnet core. In this case, the core holds the armature, and with it the valve, in open position... The time it takes for the thermocouple to generate the required thermo-EMF and the solenoid valve starts holding the armature is about 60 seconds. When the igniter goes out, the thermocouple cools down and stops generating voltage. The core no longer holds the armature; the spring closes the valve. The gas supply to both the igniter and the main burner is cut off.

The draft automatics turns off the gas supply to the main burner and igniter in case of a draft in the chimney, it works according to the principle of "gas removal from the igniter". Traction automation consists of a tee that 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 thrust sensor (Fig. 78) consists of a bimetallic plate and a union, secured with two nuts. The upper nut is at the same time a seat for a plug that closes the gas outlet from the fitting. A pipe supplying gas from the tee is attached to the fitting with a union nut.

With normal draft, the combustion products go into the chimney without heating the bimetallic plate. The plug is tightly pressed against the seat, gas does not come out of the sensor. If the draft in the chimney is disturbed, the combustion products heat the bimetallic plate. It bends upwards and opens the gas outlet from the choke. The gas supply to the igniter decreases sharply, the flame stops heating the thermocouple normally. It cools down and stops generating tension. As a result, the solenoid valve closes.

Repair and service

The main faults of the VPG-23 column include:

1. The main burner does not light up:

little water pressure;
deformation or rupture of the membrane - replace the membrane;
clogged venturi nozzle - clean nozzle;
the stock came off the plate - replace the stock with a plate;
misalignment of the gas part in relation to the water part - align with three screws;
the stem does not move well in the stuffing box - lubricate the stem and check the nut tightness. If the nut is loosened more than necessary, water may leak from under the stuffing box.

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

dirt has got under the safety valve - clean the seat and valve;
the cone spring is weakened - replace the spring;
the stem does not move well in the stuffing box - lubricate the stem and check the nut tightness. If the pilot flame is present, the solenoid valve is not held open:

3. Violation of the electrical circuit between the thermocouple and the electromagnet (open circuit or short circuit). Possible reasons are:

lack of contact between the terminals of the thermocouple and the electromagnet - clean the terminals with sandpaper;
insulation breach 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 coil of the electromagnet, their closure 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, etc. It is necessary to clean the surfaces with a piece of rough cloth. Cleaning of 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 positioned relative to the igniter - install the thermocouple relative to the igniter so as to ensure sufficient heating.

Voted Thanks!

You may be interested in:

Geysers Neva 3208 (and similar models without automatic water temperature control L-3, VPG-18 \\ 20, VPG-23, Neva 3210, Neva 3212, Neva 3216, Darina 3010) are often found in houses without centralized hot water supply. This column has simple construction and therefore very reliable. But she sometimes surprises. Today we will tell you what to do if the pressure hot water suddenly became too weak.

Gas water heater Neva 3208, or more precisely - flowing gas water heater wall-mounted type is a device for obtaining hot water using the energy of combustion of natural gas. The gas water heater is an unpretentious and easy-to-use thing. Of course, according to the idea of \u200b\u200bcommunal services, centralized hot water supply is more convenient, but in practice it is still unknown which is better. Hot water from pipes are coming sometimes rusty, then barely warm, and the payment bites. And it's not worth mentioning about the notorious summer blackouts, during which the owners of gas water heaters with a smile listen to stories about heating water in a basin on the stove.

Trouble diagnosis

So, one morning the column turned on properly, but the water pressure from the hot water tap in the bath appeared too weak... And when the shower was turned on, the column went out completely. Meanwhile, the cold water continued to flow in a brisk stream. Suspicion first fell on the mixer, but the same situation was found in the kitchen. There was no doubt that it was the gas water heater. Old lady Neva 3208 presented a surprise.

Attempts to call a foreman for repair ended, in fact, in failure. All the masters directly by telephone "diagnosed" in absentia that heat exchanger clogged with scale and offered to either replace it (2500-3000 rubles for a new one, 1500 rubles for a refurbished one, not counting the cost of work), or wash it on the spot (700-1000 rubles). And only on such conditions did they agree to a visit. But it was not at all like a clogged heat exchanger. The previous evening, the pressure was normal and during the night, scale could not build up. Therefore, it was decided to carry out the repairs independently. By the way, it is also possible to carry out repairs if the column does not turn on at normal pressure - most likely, it has broken membrane in the water unit and must be replaced.

Repair of a gas column

The Neva 3208 geyser is installed on the wall of the kitchen or, less often, the bathroom.

Before starting the repair, you must turn off the column, turn off the gas and cold water supply.

To remove the shroud, first remove the flame control knob. It is fixed on the rod with a spring and removed by simple pulling on itself, there are no fasteners. The gas safety valve button and the plastic cover remain in place and do not interfere. Removing the handle reveals access to the two mounting screws.

In addition to the screws, the casing is held in place by four pins located at the top and bottom at the rear. After loosening the screws bottom part the casing is pulled forward by 4-5 cm (the lower pins are released) and whole casing goes down (the upper pins are released). Before us internal organization gas water heater.

Our problem is in the lower, so-called "water" part of the column. This part is sometimes referred to as the "frog". In function water unit includes turning on and off the column depending on the presence or absence of water flow. The principle of operation is based on the properties of the Venturi nozzle.

The water unit is fastened with two union nuts to the water supply pipes and three screws to the gas part.

But before removing the water unit, you need to take care of the water in the column. In extreme cases, a wide basin can be substituted under the column during disassembly. But you can drain the water more carefully through stublocated at the bottom of the water unit.

To do this, unscrew the plug and open any hot water tap after the column for air access. About half a liter of water is poured out.

By the way, through this plug you can try to flush the blockage without removing the water unit. This is done reverse current water. With the plug removed (do not forget to substitute a bucket or basin) in the mixer in the kitchen or bathroom, open both taps and clamp the spout. The cold water will reverse flow through the hot water pipes and maybe push the blockage out.

After draining the water, the water unit can be removed safely. We unscrew the union nuts, move the tubes to the sides a little, loosen the three screws on the gas part and take the assembly down.

By the way, under the left nut in the recess of the water unit is filter in the form of a piece of brass mesh. It needs to be pulled out with a needle and cleaned well. When removed, this filter crumbled to pieces from old age. Considering that in the apartment after the riser there is already a pre-cleaning mesh filter, and the pipes are made of metal-plastic, it was decided not to bother with the new one. If the pipes are steel or there is no filter on the riser, then the filter at the inlet to the water unit must be left behind, otherwise the column will have to be cleaned almost monthly. A new filter can be made from a piece copper or brass mesh.

The cover of the water unit is held in place by eight screws. In the old designs, the case was silumin, and the screws were steel, and it was often very difficult to unscrew them. In Neva 3208, the body and screws are brass. After removing the cover, you can see membrane.

In older models, the membrane was rubber flat, so it worked in tension and broke rather quickly. Replacing the membrane every one to two years was a routine operation. In Neva 3208, the membrane is silicone and profiled. It hardly stretches during operation and lasts much longer. But in case of problems, replacing the membrane is quite simple, the main thing is to find a high-quality silicone one. And, finally, under the membrane is the cavity of the water unit.

Several small specks were found in it. But the main problem Was in right outlet channel... There is a narrow nozzle (about 3 mm), which creates a pressure drop for the operation of the water unit. It was it that was almost completely covered by a very firmly stuck rust flake. It is better to clean the nozzle with a wooden stick or a piece of copper wire so as not to spoil the diameter.

Now it remains to collect everything back. It also has its own subtleties... The membrane is first installed in the cover of the water unit. At the same time, it is important not to put it upside down and not to block the fitting connecting the halves of the water unit (arrow in the photo)

Now all eight screws are in place, held in place by the elasticity of the edges of the holes in the membrane.

The cover is installed on the case (do not confuse - which side, look at the correct position in the photo) and the screws carefully, 1-2 turns alternately are folded crosswise, preventing the cover from skewing. This assembly prevents the membrane from deforming or tearing.

After that, the water unit is installed in the gas section and slightly fixed with screws. Finally, the screws are tightened after connecting the water pipes. Then water is supplied and the connections are checked for leaks. It is not necessary to be zealous with tightening the nuts, if a slight tightening does not help, then it is required replacement gaskets. You can buy them or make them yourself from sheet rubber with a thickness of 2-3 mm.

It remains to put the casing in place. It is better to do this together, because it is very difficult to get on the pins almost blindly.

That's all! The renovation took 15 minutes and was completely free. The video shows the same thing more clearly.

Comments

# 63 Yuri Makarov 09/22/2017 11:43

I quote Dmitry:

21 Feb 2013, 09:36

For some reason, the DGU 23 column began to ignite poorly. The problem did not indicate itself before. In short, you bring a match - the gas is ignited, you remove your hand from the button - the gas goes out. You repeat the procedure several times - the gas burns normally. Then about 10 minutes pass - again the same story, the gas goes out.

I don’t know what is the reason, can anyone give any advice?

21 Feb 2013, 09:39

This is most likely a deterioration in thermocouple contact. There is a thermocouple that controls the flame extinguishing system. So it works most likely, you need to try to disassemble and establish contact, if it's in him.

If after this procedure the device did not work properly, then the matter is in something else.

The gas column electron vpg 23 ignites poorly.

21 Feb 2013, 09:42

Not a fact, it may be a matter of weakening the water pressure. This happens all the time. If the matter is still in water, you need to put a 230V pump at the input of the column. But before taking any action, you need to establish exactly what the reason is. It is better to invite a professional gas worker from service 04 or another similar one.

The gas column electron vpg 23 ignites poorly.

21 Feb 2013, 09:43

And what kind of column is HSV 23, I have never met. Is it a hand fired apparatus? I think the point is in the gas opening valve, it happens that it does not work and hence the whole problem, it often breaks. It is necessary to invite a specialist, he will establish exactly what the reason is in 5 minutes, maybe in the next 15 minutes he will eliminate it.

On the phone, explain to them in words what does not work. Let the spare parts bring with you.

The gas column electron vpg 23 ignites poorly.

06 March 2013, 11:45

Believe it or not, I also have the same column, but the problem is different. There is a very weak pressure of hot water, a geyser is straight from the cold tap, but the hot one barely flows. The pipes are not Soviet, but as if they were made of plastic (I have been renting this apartment for only 2 years and I don’t really understand plumbing and so on.
Photos of what the column looks like found here

You do not have the required permissions to view the attachments in this post.

The gas column electron vpg 23 ignites poorly.

07 Mar 2013, 07:33

The point is most likely a clogged heat exchanger - it must be cleaned. The hydrostatic resistance is too high, so the water flows poorly. Further, this will lead to emergency operation of the protection and shutdown of the gas column. cleaning the body exchanger from scale is not expensive, but replacing it entirely costs a pretty penny.

The gas column electron vpg 23 ignites poorly.

07 Mar 2013, 10:10

How to clean it? or at least what it looks like

The gas column electron vpg 23 ignites poorly.

08 Mar 2013, 08:30

dimikosha wrote: how to clean it? or at least what it looks like

If by ourselves, then who does how. First you need to remove it, open the cover, unscrew the couplings. Remove the heat exchanger and fill it with acid. Someone uses lemon, someone special. the composition of their households. magician., and someone even Coca-Cola. Then everything is washed with a soda solution and mounted back. Should help.

The gas column electron vpg 23 ignites poorly.

09 Mar 2013, 19:21

Better to call the service, he will have everything with him.
If by ourselves, then who does how. First you need to remove it, open the cover, unscrew the couplings. Remove the heat exchanger and fill it with acid. Someone uses lemon, someone special. the composition of their households. magician., and someone even Coca-Cola. Then everything is washed with a soda solution and mounted back. Should help.

Thank you, it's better of course a serviceman))

The gas column electron vpg 23 ignites poorly.

In accordance with the requirements of the regulatory and technical documents in force on the territory of the Russian Federation, maintenance and repair of gas-consuming equipment must be carried out by a specialized organization that has a certificate of admission to this kind work, as well as duly certified personnel.
Independent manipulation of this type of equipment is also contrary to common sense!

Conclusion: invite specialists from the service organization.

Main technical characteristics of VPG-23:

thermal power - 23 kW;
productivity when heated to 45 ° С - 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 valve block and an electromagnetic valve (Fig. 74).

The gas outlet serves to supply the combustion products to the flue gas outlet of the column. The heat exchanger consists of an air 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 HPG columns have a heat exchanger consisting of one air heater. The walls of the fire chamber in this case were made of steel sheet, the coil was absent, which made it possible to save copper. The main burner is multi-nozzle, it consists of 13 sections and a manifold, connected by two screws. The sections are assembled into a single whole with tie bolts. The manifold has 13 nozzles, each of which blows gas into its own section.

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

The voltage generated during the heating of the thermocouple is applied 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 it takes for the thermocouple to generate the required thermo-EMF and the solenoid valve starts holding the armature is about 60 seconds. When the igniter goes out, the thermocouple cools down and stops generating voltage. The core no longer holds the armature; the spring closes the valve. The gas supply to both the igniter and the main burner is cut off.

Repair and service

The main faults of the VPG-23 column include:

1. The main burner does not light up:

little water pressure;
deformation or rupture of the membrane - replace the membrane;
clogged venturi nozzle - clean nozzle;
the stock came off the plate - replace the stock with a plate;
misalignment of the gas part in relation to the water part - align with three screws;
the stem does not move well in the stuffing box - lubricate the stem and check the nut tightness. If the nut is loosened more than necessary, water may leak from under the stuffing box.

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

dirt has got under the safety valve - clean the seat and valve;
the cone spring is weakened - replace the spring;
the stem does not move well in the stuffing box - lubricate the stem and check the nut tightness. If the pilot flame is present, the solenoid valve is not held open:

3. Violation of the electrical circuit between the thermocouple and the electromagnet (open circuit or short circuit). Possible reasons are:

lack of contact between the terminals of the thermocouple and the electromagnet - clean the terminals with sandpaper;
violation of the insulation of the copper wire of the thermocouple and its short circuit with the tube - in this case, the thermocouple is replaced;
violation of the insulation of the turns of the coil of the electromagnet, their closure 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, etc. It is necessary to clean the surfaces with a piece of rough cloth. Cleaning of 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 positioned relative to the igniter - install the thermocouple relative to the igniter so as to ensure sufficient heating.

Gas instantaneous water heaters

The main units of an instantaneous water heater (Fig. 12.3) are: a gas burner device, a heat exchanger, an automation system and a gas outlet.

Gas low pressure fed to the injection burner 8 ... The combustion products pass through the heat exchanger and are discharged into the chimney. The heat of the combustion products is transferred to the water flowing through the heat exchanger. A coil serves to cool the fire chamber 10 through which water circulates, passing through the heater.

Gas instantaneous water heaters are equipped with gas outlet devices and traction interrupters, which, in the event of a short-term loss of draft, prevent the flame from going out

gas burner device. There is a flue gas outlet for connection to the chimney.

Flowing water heaters are designed to obtain hot water where it is not possible to provide it in a centralized manner (from a boiler room or heating plant), and are classified as immediate-action devices.

Figure: 12.3. Schematic diagram instantaneous water heater:

1 – reflector; 2 – top cap; 3 – bottom cap; 4 – heater; 5 – igniter; 6 – casing; 7 – block crane; 8 – burner; 9 – fire chamber; 10 – coil

The devices are equipped with gas outlet devices and traction breakers, which prevent the flame of the gas burner device from extinguishing in the event of a short-term failure of the draft. To join smoke channel there is a flue pipe.

According to the nominal heat load, the devices are subdivided:

With a rated thermal load of 20934 W;

With a rated thermal load of 29075 W.

Domestic industry serially produces household gas flow water-heating apparatus VPG-20-1-3-P and VPG-23-1-3-P. The technical characteristics of the indicated water heaters are given in table. 12.2. Today, new types of water heaters are being developed, but their design is close to the current ones.

All the main elements of the apparatus are mounted in a rectangular enamel casing.

The front and side walls of the casing are removable, which creates convenient and easy access to the internal units of the device for preventive examinations and repairs without removing the device from the wall.

Water-heating flow-through gas apparatus of the VPG type are used, the design of which is shown in Fig. 12.4.

On the front wall of the casing of the apparatus, there is a gas valve control knob, a button for switching on an electromagnetic valve and a viewing window for observing the flame of the pilot and main burners. Above the device there is a gas outlet device that serves to remove combustion products into the chimney, from below - branch pipes for connecting the device to the gas and water networks.

The device has the following components: gas pipeline 1 , gas blocking valve 2 , pilot burner 3 , main burner 4 , cold water connection 5 , water-gas block with burner tee 6 , heat exchanger 7 , automatic traction safety device with solenoid valve 8 , thrust sensor 9 , hot water connection 11 and gas outlet device 12 .

The principle of operation of the apparatus is as follows. Gas through the pipe 1 enters the solenoid valve, the activation button of which is located to the right of the gas valve activation knob. The gas shut-off valve of the water-gas burner unit carries out the forced sequence of the ignition burner switching on and the gas supply to the main burner. The gas valve is equipped with one handle that turns from left to right with fixation in three positions. The extreme left position corresponds to the closure of the gas supply to the pilot and main burners. The middle fixed position (turning the handle to the right up to the stop) corresponds to the full opening of the valve for the gas supply to the ignition burner when the valve is closed to the main burner. The third fixed position, achieved by pressing the handle of the valve in the axial direction until it stops and then turning it all the way to the right, corresponds to the full opening of the valve for gas supply to the main and pilot burners. In addition to the manual blocking of the valve, there are two automatic blocking devices on the gas path to the main burner. Blocking the gas flow to the main burner 4 with the obligatory operation of the ignition burner 3 provided by a solenoid valve.

Blocking the gas supply to the burner, based on the presence of water flow through the apparatus, is performed by a valve driven through a stem from a membrane located in the water-gas burner block. When the valve solenoid button is pressed and the gas shut-off valve is open, the gas flows through the solenoid valve to the shut-off valve and then through the tee through the gas pipeline to the ignition burner. With normal draft in the chimney (vacuum is at least 2.0 Pa). The thermocouple, heated by the flame of the pilot burner, transmits a pulse to the solenoid valve, which automatically opens gas access to the shut-off valve. In the event of a draft failure or its absence, the bimetallic plate of the draft sensor is heated by the outgoing gas combustion products, opens the draft sensor nozzle, and the gas supplied to the ignition burner during normal operation of the apparatus leaves through the draft sensor nozzle. The flame of the pilot burner goes out, the thermocouple is cooled, and the solenoid valve is turned off (within 60 s), i.e., it stops the gas supply to the apparatus. To ensure smooth ignition of the main burner, an ignition retarder is provided, which works as a check valve when water flows out of the supra-membrane cavity, partially closing the valve section and thereby slowing down the upward movement of the membrane, and, consequently, the ignition of the main burner.

Table 12.2

Specifications flow gas water heaters

Characteristic	Water heater brand
VPG-T-3-P I	VPG-20-1-3-P I	VPG-231	VPG-25-1-3-V
Thermal power of the main burner, kW	20,93	23,26	23,26	29,075
Nominal gas consumption, m 3 / h: natural liquefied	2,34-1,81 0,87-0,67	2,58-2,12 0,96-0,78	2,94 0,87	no more than 2.94 no more than 1.19

Water consumption when heated to 45 ° С, l / min, not less	5,4	6,1	7,0	7,6
Water pressure in front of the apparatus, MPa: minimum nominal maximum	0,049 0,150 0,590	0,049 0,150 0,590	0,060 0,150 0,600	0,049 0,150 0,590
Chimney vacuum for normal operation of the device Pa
Unit dimensions m: height width depth
Apparatus weight͵ kg, no more			15,5

The upper class belongs to the flow-through water-heating apparatus VPG-25-1-3-V (Table 12.2). He manages all processes automatically. This ensures: gas access to the pilot burner only if there is a flame and water flow on it; cessation of gas supply to the main and pilot burners in the absence of vacuum in the chimney; regulation of gas pressure (flow); regulation of water consumption; automatic ignition of the pilot burner. Still widely used are capacitive water heaters AGV-80 (Fig. 12.5) consisting of a sheet steel tank, a burner with an igniter and automation devices (a solenoid valve with a thermocouple and a thermostat). A thermometer is installed in the upper part of the water heater to control the water temperature.

Figure: 12.5. Automatic gas water heater AGV-80

1 – traction breaker; 2 – thermometer sleeve; 3 – traction safety automation unit;

4 – stabilizer; 5 – filter; 6 – magnetic valve; 7– - thermostat; 8 – gas tap; 9 – pilot burner; 10 – thermocouple; 11 – damper; 12 – diffuser; 13 – main burner; 14 – cold water supply connection; 15 – tank; 16 – thermal insulation;

17 – casing; 18 – branch pipe; for hot water outlet to apartment wiring;

19 – safety valve

The safety element is a solenoid valve 6 ... Gas entering the valve body from the gas pipeline through the valve 8 igniting the igniter 9 , heats the thermocouple and enters the main burner 13 , on which the gas is ignited from the igniter.

Table 12.3

Technical characteristics of gas water heaters

with water circuit

Characteristic	Water heater brand
AOGV-6-3-U	AOGV-10-3-U	AOGV-20-3-U	AOGV-20-1-U
Dimensions, mm: diameter height width depth	– –	– –	–	– –
Heated room area, m 2, no more				80–150
Rated thermal power of the main burner, W
Rated thermal power of the ignition burner, W
Water temperature at the outlet of the apparatus ° С	50–90	50–90	50–90	50–90
Minimum vacuum in the chimney, Pa
Temperature of combustion products at the outlet of the apparatus ° С, not less
Connecting pipe thread of fittings, inch: for supplying and removing water for gas supply	1 ½ 1 ½	1 ½ 1 ½	¾	¾
Efficiency,%, not less

Automatic gas water heater AGV-120 is designed for local hot water supply and heating of premises up to 100 m 2. The water heater is a vertical cylindrical tank with a capacity of 120 liters, enclosed in a steel casing. A low-pressure cast-iron injection gas burner is installed in the furnace section, to which a bracket with an igniter is fixed. Gas combustion and maintenance of a certain water temperature are automatically controlled.

The automatic control circuit is two-position. The main elements of the control and safety automation unit are a bellows thermostat, an igniter, a thermocouple and a solenoid valve.

Water heaters with a water circuit of the AOGV type operate on natural gas, propane, butane and their mixtures.

Figure: 12.6. Gas heating apparatus AOGV-15-1-U:

1 - thermostat; 2 - thrust sensor; 3 - shut-off and control valve;

4 - shut-off valve; 5 - connection of the ignition burner; 6 - filter;

7 - thermometer; 8 - fitting for direct (hot) water supply; 9 - connecting tube (common); 10 - tee; 11 - connecting tube of the draft sensor; 12 - impulse pipeline of the ignition burner; 13 - safety valve; 14 - connecting tube of the flame extinction sensor; 15 - mounting bolt; 16 - asbestos gasket; 17 - facing; 18 - flame extinguishing sensor; 19 - collector; 20 - gas pipeline

AOGV type devices, in contrast to DHW cylinders, are used only for heating.

The AOGV-15-1-U apparatus (Fig. 12.6), made in the form of a rectangular pedestal with a white enamel coating, consists of a heat exchanger boiler, a smoke exhaust pipe with a control damper as a draft stabilizer, a casing, a gas burner device and an automatic control and safety unit.

Filter gas 6 falls into the shut-off valve 4 , from which there are three exits:

1) main - to the shut-off and control valve 3 ;

2) to the fitting 5 top cover for gas supply to the ignition burner;

3) to the fitting of the lower cover for gas supply to the draft sensors 2 and the flame goes out 18 ;

Through the shut-off and control valve, gas enters the thermostat 1 and along the gas pipeline 20 to the collector 19 , from where it is fed through two nozzles into the confuser of the burner nozzles, where it mixes with the primary air, and then goes to the combustion space.

Figure: 12.7. Vertical burners ( and) and adjustable with horizontal

tubular mixer ( b):

1 - cap; 2 - fire nozzle; 3 - diffuser; 4 - gate; 5 - nozzle nipple;

6 - nozzle body; 7 - threaded bushing; 8 - mixer tube; 9 - mixer mouthpiece

Gas flowing water heaters - concept and types. Classification and features of the category "Gas flowing water heaters" 2017, 2018.

Geyser electron vpg 23 instruction. Gas flowing water heaters. Review questions