Water reducer for geyser Neva

Operating principle of the column water block

The hollow frog device is divided into two parts using a rubber membrane. One half of the reducer is connected to the cold water supply, the second has a rod connected to the gas valve. On the metal rod of automatic water heaters there are “wings” connected to the electric ignition unit.

The operating principle of the gas water heater unit is as follows:

when the cold water tap is opened, one of the cavities is filled with water;
under the pressure of water, pressure is exerted on the membrane of the water unit;
the diaphragm bends under pressure and presses on the rod located in the second cavity;
a metal rod presses on the valve, opening the gas supply;
in automatic dispensers, there are ears on the stem connected to the ignition unit;
a spark is supplied to the burner, igniting the flame;
after closing the DHW tap, the structure and internal parts of the unit begin to move in reverse;
the rod returns to its original position thanks to the spring and closes the gas supply.

The design of the gas water heater reducer may differ depending on the model of the gas water heater, but the general principle of operation of the unit remains unchanged. Any malfunctions result in equipment malfunctions. A breakdown can be determined by several characteristic signs.

Possible malfunctions of the water unit

There are malfunctions and malfunctions in the operation of a flow-through water heater, which clearly indicate failure of the structural elements of the gearbox. These include:

refusal to turn on the column;
the flame does not light up the first time;
there is a water leak from the gearbox;
after closing the DHW tap the flame does not go out.

Malfunctions indicate the following possible breakdowns and malfunctions in the “frog”:

The membrane has broken - the average service life of the diaphragm is 5-7 years. Over time, due to constant mechanical stress and hard water, the rubber breaks through. A sign of membrane failure is that water drips from the gearbox.
The membrane has become coarsened - the quality of the water unit of the gas water heater depends on the elasticity of the diaphragm. To operate, it is important that the membrane responds sensitively to any changes in water pressure. If the gasket is roughened, the column will operate with a delay. After turning off the DHW tap, the gas burner continues to work for some time.
The rod is clogged - when the membrane breaks, water enters the metal surface of the rod, causing it to corrode. Rust prevents the needle from moving properly. Signs of malfunction: starting the column is difficult. The flame ignites only with strong water pressure. After closing the DHW tap, the burner does not go out.
The coarse filter is clogged - there is a mesh at the entrance to the gearbox, which quickly becomes clogged, especially if the connection conditions were violated and the piping diagram was carried out with errors. Symptom of malfunction: difference in pressure at the inlet and outlet of the water heater.

All described breakdowns are easily fixed. The need to completely change the gearbox in a gas water heater is extremely rare. Do-it-yourself repairs, if you have the tools and understand the internal structure, will take no more than 30 minutes.

Refusal to ignite

The Neva 4511 geyser, which you can repair with your own hands if you refuse to ignite, is a budget and fairly simple model. Quite often, the problem mentioned above can be caused by the fact that the ventilation system suffers due to lack of draft. If this is the case, then the problem can be eliminated by cleaning the channel. If the batteries are low, a problem may arise with the power supply; this issue can be resolved by simply replacing it. The gas water heater "Neva 4511", a review of the faults of which is mentioned in the article, may experience failure to ignite due to low water pressure in the system. In this case, the consumer can wash the filters and also clean the device from combustion products. If this approach does not solve the problem, then you should contact your utility service with a question about low pressure. If the Neva 4511 gas water heater still does not light up, you can carry out the repair yourself by adjusting the temperature of the coolant. This solution is relevant if the balance between hot and cold water is incorrect.

Repair and maintenance of gas-water unit

The design of the gas water heater water reducer has a simple internal structure. Everything is easy to understand. If desired, you can repair the geyser frog or carry out preventive maintenance without calling a technician.

How to remove a frog from a gas water heater

First you need to turn off the water and gas supplies. After this, work is carried out in the following order:

drain the water from the heat exchanger - for this purpose it is better to use a tap or mixer located significantly below the water heater;
disconnect the gas and water supply pipelines (an adjustable wrench will be required);
Now you can remove the water unit of the gas water heater; if everything is done correctly, the frog should be easily dismantled.

Sobmart - useful things

Gas water heater Neva 4511 There was a problem with the gas water heater Neva 4511 (4513), it stopped turning on when the water pressure was low, it simply doesn’t light up unless the tap is turned all the way.

Brief technical characteristics of the water heater Neva 4511 Ignition type: Automatic Fuel type: Natural gas / Liquefied gas Combustion chamber: Open Power: 21 kW Capacity, l/min: 11 Dimensions HxWxD, mm: 565x290x221 Minimum water pressure for starting, bar: 0.15

The problem turned out to be a torn membrane (3227-02.278 diameter 76 mm) located in the water unit (3227-02.270), which ensures gas access to the main burner only in the presence of water flow, while simultaneously ensuring the operation of the solenoid valve.

The membrane can be purchased on AVITO

Replacing the membrane is quite simple, but it requires attention and order in what to remove.

Let's get started, turn off the water and begin to disassemble - remove the handles of the gas water heater, pry them off with a screwdriver and remove them tightly

HANDLE D 33 mm (light gray) NEVA 4511 (3272-00.006)

OVERLAY 66x192 WITH DISPLAY NEVA 4511 (3227-07.003, 3272-00.050)

Remove the batteries from the battery compartment:

Battery compartment NEVA 4510/4511/4513 (3227-00.008)

Unscrew the casing of the gas water heater and disconnect the display connectors

Gas water heater housing NEVA-4011, NEVA-4511 without lining 3272-03.000-02

Monitor display of geyser NEVA-4510, NEVA 4511, NEVA 5611 Article number 3227-07.003

Gas water heater housing NEVA-4011, NEVA-4511 without lining 3272-03.000-02

Unscrew the water supply pipes

Copper tube for gas water heater NEVA-4511 from the water unit to the heat exchanger Cold water pipe for gas water heater Neva 4511

Unscrew the water assembly housing

Water unit for geyser NEVA 4011, NEVA-4510, NEVA 4511 3227-02.270

We disassemble the water unit, unscrew the 6 connecting screws

Water unit for geyser NEVA 4011, NEVA-4510, NEVA 4511 3227-02.270

We take out the membrane of the water unit and inspect it for a rupture.

Hole in MEMBRANE NEVA 4511 (3227-02.278) d 76 mm

MEMBRANE valve NEVA 4511 (3227-02.278) d 76 mm

Comparing new and old membranes

MEMBRANE NEVA 4511 (3227-02.278) d 76 mm

We assemble the water unit and the rest in the reverse order; when putting on the membrane, I advise you to put it on the part with the water rod, and then press it.

MEMBRANE NEVA 4511 (3227-02.278) diameter 76 mm and water unit

This completes the procedure, but if suddenly you also want to clean the gas water heater, i.e. carry out maintenance, read on:

We remove the gas column, place it horizontally and begin to unscrew the combustion chamber, there are two screws on the sides

Combustion chamber of the gas water heater Neva 4511

Unscrew the draft sensor from the combustion chamber

Draft sensor 90°C for gas water heater NEVA-4011, NEVA 4511, NEVA 4513 (3222-15.000)

Unscrew and remove the burner, it is also held on by two self-tapping screws

Spark plug spark plug for gas water heater NEVA-4510M, NEVA 4511 (3227-02.130-01)

Gas water heater burner Neva 4511

Afterwards we remove the heat exchanger - almost everything has been disassembled)

Geyser Neva 4511

Heat exchanger MasterGaz, Neva 4511, 6011,5111, 5611 3272-06.00

We dilute citric acid and pour it into the pipette with a pipette, and also spray the entire heat exchanger

A huge amount of scale was formed from dust in the air during combustion

Scale on the heat exchanger of the gas water heater Neva 4511

Let's clean the burner at the same time.

Gas water heater burner Neva 4511

Now that the cleaning is complete, we put everything back together and check for leaks and functionality.

If you require a membrane, please contact us.

Malfunctions of the water reducer of the column, repairable by yourself

1) The column does not turn on at operating water pressure.

the elastic membrane is torn;
the rod is stuck.

a torn membrane is replaced by a whole part;
the locked rod is lubricated and developed manually.

2) Weak hot water pressure.

weak cold water pressure;
The strainer is clogged.

weak cold water pressure is checked in the water pipes or the information is clarified with the relevant authorities;
a clogged filter is changed or cleaned, and replaced.

3) Delay in turning on the column when opening a hot water tap.

clogging of the retarder ball channel;
Incorrect adjustment of the retarder stop.

clogged channel - cleaned;
Incorrect adjustment of the stop can be corrected by screwing in the adjusting screw 2-3 turns.

4) The geyser does not operate at full capacity or goes out.

the integrity of the membrane is compromised.

the damaged part is replaced.

More serious faults are repaired by gas service technicians or the reducer for the gas water heater is replaced.

When using a gas water heater, pay attention to the stability of the gearbox installed on the gas water heater. If necessary, perform a preventive inspection of the unit, lubricate rubbing parts, and replace worn parts.

By following these simple rules, you will increase the service life of your geyser.

A geyser is a water heating device that comes with many different devices. Let us note the operation of the water reducer of the gas water heater. It is also called a water block or knot. It is installed in the device in front of the heat exchanger.

According to the material of manufacture, water reducers are divided into those made of:

It should be noted that brass is copper and zinc, that is, an alloy of these metals; this material is often used for the manufacture of plumbing fixtures. Plastic units (Fig. 1) are durable and practical. Polyamide is a material that is very similar in composition to plastic, but its durability can be explained by the presence of glass fiber in the composition.

Rice. 1 Plastic membrane water unit

The functioning of this device in a gas water heater is no different from other gas water heaters. That is, the main difference lies in the material of manufacture.

Membrane reducers for gas water heaters can withstand fairly high pressures, as for household appliances. Namely, it is from 0.5 to 3 m3/hour.

Replacing the membrane

Before replacing the membrane, turn off the equipment and turn off the cold water and gas. One of the hot water taps opens, which will relieve pressure in the pipes. At the next stage, the column casing is removed, and then the mounting screws, which are located under the decorative overlays. The technician should remove the water regulator; to do this, unscrew the motor nuts. Now you can begin the procedure for replacing the membrane. When repairing the Neva 4511 geyser with your own hands, it is important to note that the element being replaced should not be installed upside down. It is important not to block the bypass channel. Next, you can reassemble the gas water heater, proceeding in reverse order. It is important to install all the gaskets in place, so treat this step extremely carefully, but if you have experience, these manipulations will take no more than 15 minutes.

Operating principle and design

The design of a brass geyser reducer consists of the following components (Fig. 2):

The diaphragm and disk look like a single unit;
Flow regulator;
Temperature selector;
Water flow regulators with the selector open and closed;
Venturi tube;
Hot water filter.

Rice. 2 Design of the water device

The gearbox for a geyser has the main task of starting and ensuring normal operation after opening the water tap. Also, thanks to this unit, you can regulate the flow of water that enters the gas water heater. The reducer also performs a protective function, since in case of poor pressure it prevents the column from overheating.

The principle of operation of the column water unit is the effect of water flow on its parts. Namely, when water passes through the reducer, it puts pressure on the membrane (diaphragm) (Fig. 3) and the so-called fungus (disc). This fungus changes its location, rising up to the level of the valve. The fungus rod, in turn, directly affects the gas unit, that is, its valve. And as a result, gas begins to flow into the burner of the device.

Types of faults and their elimination

As you know, a perpetual motion machine has not yet been invented, and even the most reliable and high-quality equipment may experience malfunctions.

There are minor problems in the gas water heater Neva 4511, which can be corrected without the help of a specialist.

Let's look at some of them.

The device turns off periodically

Clean the chimney and check the entire system, as an option to strengthen the sealing
Very high water temperature. Increase water supply, reduce gas supply level.
Carbon deposits have formed. Just clean it.

The tap is turned on, but the water heater does not work

The batteries are dead. Replace
The inlet and outlet valves are not fully open.
Not enough liquid. Adjust flow
Poor pressure. Question with utilities
The filter is clogged and scale has formed. Perform cleaning.

There is a spark, but the device does not start

Check the gas supply valve, it may be closed
There was air in the pipes. A problem with the first start-up or a problem that arose as a result of the dispenser being idle. Open the water supply tap for a few seconds (5-7). Close. Perform the manipulation several times.
The spark does not reach the gas stream. The system is subject to adjustment.

In order for the installation and operation of the unit to proceed without problems, carefully read the instructions for the device, everything is described in detail in it.

A high-quality geyser can provide comfort during water procedures for a long time. When choosing a device, it is important to pay attention to the reputation of the manufacturer. In the domestic market, the leading position in the design of flow-through gas water heaters belongs to the BaltGaz Group concern. One of the models produced by the company is the Neva-4511 geyser, technical characteristics, reviews, advantages and disadvantages of which will be discussed in the article.

Malfunctions

Qualified experts say that in 8 out of 10 cases of geyser breakdowns, the problem lies in the water unit. As a rule, this is contamination or deformation of the membrane in the assembly. Namely, the deposition of various clogs and salts occurs, as well as the formation of cracks in the housing, etc.

You should know that a damaged node cannot perform its functions fully. If the membrane is damaged, it cannot stretch enough to allow gas to pass through.

There are models of geysers whose membrane needs to be changed regularly. According to reviews, this is a device from the manufacturer Neva. In order to prevent breakdowns, from time to time you need to disassemble the gearbox in order to clean it. Then you can notice the deformation of the membrane in time. Filters in the water unit often become clogged.

The wear of the gearbox is explained by frequent switching on/off; this greatly affects the membrane in the unit, seals, etc. When the seal wears out, water begins to leak out of the gearbox.

We can conclude that the reducer for a gas water heater is an important part that needs to be maintained, which means it must be in such a position that there is constant access to it. Such maintenance of the gas water heater or, if necessary, repairs can be carried out independently, since these manipulations are not complicated. To replace or clean the gearbox you do not need to have special skills.

Rice. 4 Water unit for the column, the body of which is secured with 8 bolts

Water block repair and maintenance

In order to carry out any manipulations with the gearbox, or to understand whether the problem lies precisely in this part, you need to unscrew it from the copper pipes, that is, the nuts are unscrewed. Next you need to unscrew the reducer from the gas unit. As a rule, it is located under the gas valve and is secured with three bolts. Often in new models the gearbox is secured with one bolt. While unscrewing, the device must be held so that it does not fall.

To open the gearbox, you need to unscrew the bolts that hold two parts of the housing, usually there are 8 of them (Fig. 4). They are located in a circle. Next, you should check the integrity of the rubber membrane in the middle and the integrity of the body. If the membrane is clogged, it needs to be cleaned and put back in place, and if it is deformed, you should buy a new one. A new membrane is inserted in place of the previous one. Today, membranes of different qualities are sold; you should not buy something that is too thin, as it may break in the near future. There are good quality silicone membranes, but don’t be lazy, but go to several stores and find one.

Rice. 5 Water unit included in the column configuration

To install the gearbox backwards, it is important to determine which pipe connects where. If you look closely, the inlet and outlet pipes are different in diameter. The hole through which water is supplied to the gas water heater reducer is larger than the one through which water exits the device. If the gearbox is installed incorrectly, problems will arise with the membrane and, in general, with the operation of the entire unit.

Next, the two parts of the housing are bolted and screwed to the inlet and outlet pipes. The nuts that screw the assembly to the pipes are equipped with rubber gaskets for sealing. When installing a water unit, you need to check them carefully. Sometimes you need to replace them too. Next, you should test the water unit by starting the column.