The temperature controller is the main part of the electric water heater. With it, it can realize automatic on-off and heating in the preset temperature range. Do you know the working principle and wiring method of the electric water heater?

Working principle of temperature controller of electric water heater

The temperature controller of electric water heater uses copper metal sheet to make degree contact. Because copper is sensitive to heat expansion and cold contraction, when the temperature does not reach the set value, the copper metal sheet is in a curved shape, and its contact is closed. When the water is heated to the set temperature, the heat of the water will be transmitted to the copper strip on the copper strip in the temperature controller. Because the heat is extended, the contact will be opened to a power-off state. When the temperature drops, the copper strip returns to its original state, making the contact turn on to be electrified and heated.

How to connect the temperature controller of electric water heater

The temperature controller of electric water heater is divided into different manufacturers, different series and different models. When wiring, it cannot be mechanically copied. Similarly, the temperature controller is connected with different probes. You can refer to the manual of the temperature controller corresponding to the temperature controller, or there will be a mark in the instrument description of the temperature controller to indicate which probe the temperature controller uses. The probe is not normally open or normally closed, in fact, it is resistance property, different materials, different temperature control.

There are three types of wiring of temperature controller: thermocouple wiring, output wiring or control wiring, temperature compensation resistance wiring; the output is divided into voltage output, current output, switching value output, etc. the control wiring can be divided into one group or two groups or three groups. Probes are also called thermocouples or temperature sensors. 123 connected to thermal resistance (3-wire system) 23 connected to neutral in thermocouple, high phase to fire (220V), total, low is the control contact, if it is to be externally connected to 220V relay for current expansion, total connected to phase, low connected to one end of the relay. The other end of the relay is connected to the middle. Don't forget to disconnect the low and the interrupt