Rules for adjusting the water pressure switch for the pump

You can adjust the water pressure switch for the pump yourself if you follow the instructions

The principle of operation and the device of the water pressure switch for the pump

Externally, the relay is a small block with two springs for setting the maximum and minimum pressure. Their tension is easily adjusted with special nuts. A membrane is designed to transmit the force of water. At a minimum, it weakens the spring, and at a maximum, it compresses. This action on the springs causes the relay contacts to close or open. This is how the pump turns on or off.

Pressure switch device

The installation of such equipment at a pumping station allows you to maintain the pressure in the water supply system in a given range. The result is a uniform pressure with the required force. A correctly adjusted level of the upper, as well as the lower limits of such an indicator ensures the periodic shutdown of the pumping station. This contributes to the extension of the life of the water equipment and its trouble-free operation.

Connection diagram of a pressure switch to a submersible pump

The order of work of the water station under the control of the relay

Works pumping station according to the following scenario:

1. The pump draws water into the existing tank.
2. An increase in pressure occurs, which can be checked on the pressure gauge.
3. After the maximum set limit is reached, the contacts open and the pump is turned off.
4. When the water tap is open, the pressure in the system decreases and when it reaches a minimum value, the pumping station is automatically turned on.

The principle of the water station

Constant and uninterrupted repetition of this cycle is a guarantee of reliable, trouble-free operation of the equipment, constant pressure in the water supply system.

Correct setting of the pressure switch

After the pumping station is installed and connected, special attention should be paid to setting the water pressure switch for the pump. The operation of the entire system will depend on the correct setting of the limit levels.

Water pressure switch

To do this, first of all, it is necessary to check what parameters the tank was configured for during its manufacture. The standard minimum level is approximately 1.5 atmospheres, and the maximum is 2.5. This can be checked with an ordinary mechanical pressure gauge with an empty tank and a pump disconnected from the mains. Due to the fact that this device has a metal case, its readings are more accurate than those of fellows made of plastic. To measure the pressure, unscrew the small cap on the body of the empty tank, then connect the pressure gauge and take the reading.

The pressure switch of the pumping station is adjusted using a large and small spring

Useful advice! When purchasing a ready-made station, such a check may not be required. If the equipment was purchased separately (pump, relay, tank), then the initial setting is required.

The subtleties of adjusting the water pressure switch for the pump

To set specific values ​​of the pressure level, you need to adjust the pressure switch of the water pump. To do this, you need to carry out the following manipulations:

1. Fill the tank until the pressure gauge shows the required maximum value.
2. Switch off the pumping station.
3. After opening the relay case, you need to gradually rotate the small nut until the internal mechanism works. Clockwise rotation - increasing the pressure level, counter - decreasing.
4. To set the lower parameter, the water from the tank is gradually drained by opening the tap.
5. As soon as the pressure gauge has reached the required mark, the water drain is stopped.
6. To adjust the lower pressure, turn the large nut, also until the contacts are triggered.

Block connection automation and pressure switch for submersible pump

Useful advice! The procedure for checking or setting the level of indicators is recommended to be carried out not only during the initial setup, but also every month or at least every quarter during operation.

Electronic water pressure switch

With a small range between the upper and lower pressure limits, the pumping station rather pumps up water, creating a constant average level of this indicator in the water supply system. In this case, the water pressure will be uniform and comfortable. If, by adjusting the water pressure switch, a wider range is set for the pump, then the equipment will turn on less often. With this setting, the station will turn on less often and will last much longer.

LP3 relay mounting diagram

Useful advice! When adjusting, remember that the minimum difference between the lower and upper limits can be at least 1 atmosphere.

Dry run protection

A fairly frequent cause of breakdowns during the operation of pumping stations is the lack of water in the system. Loading the pump without water leads to deformation of internal parts and failure of all equipment.

Related article:

How to install a pump to increase water pressure in an apartment. Classification of pumps for increasing the pressure in the water supply of the apartment. Selection criteria, features of self-installation.

The lack of fluid in the system can be caused by the following reasons:

• fluid consumption is significantly greater than the volume of a well or well;
• interruptions in the supply of water in the summer;
• accidents on water supply systems.

Scheme of operation of a surface pump with a water pressure switch

To guard against such troubles, there are relays with dry running protection. Such equipment provides for the possibility of opening the contacts, in which the pump is completely turned off. Usually this indicator is set by the plant at about 0.5 atmospheres and is not subject to adjustment. It will be possible to start the pumping station engine only when the normal amount of water in the system is restored.

Dry running relay operation diagram

Also, manufacturers can offer another type of protective equipment. Flow switch supplemented with functions pressure switch, also effectively protects against breakage in the absence of water. This sensor shuts down the system in the event of no flow or a head drop of less than 1 atmosphere.

Useful advice! When adjusting the water pressure switch for the pump, remember the manufacturer's declared capacity of the station itself. If the station cannot produce a water pressure of more than 5 atmospheres, then there is no point in adjusting it to a large point.

Adjusting the water pressure switch for the pump (video)