How to ADJUST the pressure Switch to the Best part 2 HOW TO ADJUST THE PRESSURE SWITCH
Pressure Switch Operating Principles
WHAT IS THE PRESSURE SWITCH?
The pressure switch is a solenoid valve or switch that regulates the pressure in the heating system or sanitary water by turning the autoclave or pump on and off.
By means of this component it is possible to monitor the status of the heating system so that it never goes beyond the limits allowed by the efficiency of the system.
There are various types, but all have the same function as a system switch; as for the thermostat, the pressure switch is used to regulate the operation of the mechanism that pushes the water where and when it is needed.
HOW DOES IT WORK?
The pressure switch is the key element of the whole system; it converts the water pressure into a mechanical movement that pushes the switch to turn the electric pump on or off.
In this circuit, the water sent by the electric pump arrives, from a lower inlet, in the pressure container and pushes a membrane that compresses the air until the preset value is reached; once the maximum has been reached, the pressure switch automatically switches off the pump and restarts it when it drops to minimum.
Each time a tap is opened or the boiler water system is started, the pressure inside the system slowly decreases and as soon as the value reaches the minimum operating limit, the pressure switch will restart the autoclave to return to full power.
This system can also be programmed to operate only at certain times of the day or when its intervention is required.
ADJUSTMENT OF THE PRESSURE SWITCH
At the time of installation, the pressure switch is ready for use with a delivery pressure ranging from 2 to 4 atmospheres, but it can be calibrated according to different intervention values by means of 2 adjustment screws: one for operation and the other for shutdown.
At this stage it is important to follow the information given in the instruction booklet or rather to rely on the expert hands of a technician.
Generally the first screw (on the small side spring) is called the differential and regulates the pressure difference between the start and stop of the pump. The second screw, positioned on the central spring, determines the maximum pressure value on which we want the pump to stop when the pressure increases.
By turning the nuts clockwise the starting pressure increases, while in the anticlockwise direction it decreases until the minimum starting pressure of the pump is established and therefore the minimum value for contact to occur.
It is certainly advisable to mount the pressure switch vertically, in this way excessive deposits in the pressure duct are avoided, causing a malfunction due to the obstruction of the vessels.
MAINTENANCE AND REPLACEMENT
If the impurities present in the water of the heating system were to infiltrate the mechanisms of the pressure switch, this could have problems with the functioning of the solenoid valve and therefore an efficiency in the heating or sanitary system; the hot water will not arrive properly at its destination.
This is why it is important to carry out periodic maintenance on this element by carefully cleaning the parts in a precise and safe manner, testing its operation.
This operation can also be carried out by those who are familiar with mechanical gears, but it is highly advisable to rely on a technician experienced in the field to avoid further damage to the equipment.
First of all, being an electrical system, it is advisable to disconnect the power, close the general water tap and drain the system to eliminate the air inside the pressure switch.
By carefully following what is written in the maintenance booklet supplied with the device, proceed to disassemble the pressure switch.
Once removed it will be easier to eliminate the dirt accumulated inside; being very careful not to damage the membrane, with the use of wire or a screwdriver you can reach the most difficult to reach corners.
Once the cleaning has been completed and all the pieces have been assembled, it is advisable to check its operation by means of the system loading and unloading cycles.
If the problem persists beyond the cleaning process, a quality replacement and replacement may be needed.
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