Central air conditioning thermostat
The central air conditioning thermostat is specially developed and designed for controlling fan coil units, and is widely used in HVAC control such as heating, cooling, and ventilation. The speed of the fan can be manually or automatically controlled by adjusting the wind speed button to achieve the purpose of controlling the room temperature.
Product introduction broadcast editor: Central air conditioning thermostats are divided into two types: electronic and mechanical, and are divided into LCD display and adjustable according to different displays. The central air conditioning thermostat is programmed to control and send various signals to the actuator, thereby achieving the purpose of controlling the air conditioning fan coil unit and electric two-way valve.
Mechanical broadcast editing: Mechanical coil temperature controllers are used in commercial, industrial, and civil buildings. It can control the end fan coil units and water valves of central air conditioning for heating and cooling. Keep the ambient temperature of the controlled area constant within the set temperature range. The temperature setting dial pointer should be set to the desired constant temperature position. The functions of the toggle switch are: power switch (ON - OFF); Operation mode switch (heating HEAT - cooling COOL), FAN wind speed switch (low speed L - medium speed M - high speed H). Controllable equipment: Three speed fan coil unit wind speed, three line electric valve, two line electric valve, can also be connected to solenoid valve, switch type air valve or three line type air valve.
Technical specifications 1. Rated voltage: 230VAC ± 10% 50/60Hz 2. Load current:< 3A resistive load 3. Temperature deviation: ≤ 1 ℃ at 25 ℃ 4. Environmental temperature: -25 ℃~55 ℃ Relative humidity<85% (23 ℃) 5. External dimensions: 130X85X40 (length X width X thickness) Advantages 1. Temperature setting can be set through a knob, convenient and intuitive 2. It can be directly installed on the standard junction box on the wall 3. Beautiful appearance and reliable performance 4. The switch adopts a toggle type, comfortable to handle, and has a long service life 5. It can control two-wire or three line electric (ball) valves 6. It can be used to control fan coil units and electric (ball) valves or air valves and other equipment 7. The bimetallic large film box and sheet box temperature sensing element can ensure accurate temperature control according to requirements 8. Automatic Cold to hot conversion can be controlled by pipeline thermostats (referring to certain models of thermostats). 9. Special functions: a. Overlimit stop b. Safety protection cover c. Wall hanging method for special installation needs 10. All models of constant temperature have heat sensors, which can further improve the control of hot and cold temperatures
Operation method
1. Power on/off: Turn the toggle switch to the ON position to turn on the thermostat; Turn the switch to the OFF position to turn off the thermostat.
2. Working mode setting: Move the toggle switch to the COOL position, and set the thermostat to cooling mode; Turn the toggle switch to the HEAF position and set the thermostat to heating mode.
3. Temperature setting: Mechanical thermostat, using a rotary knob to set the temperature, simply point the red dot at the temperature data indicated on the panel.
4. Wind speed setting: Move the switch to the LOW position; Set the thermostat to low wind speed; Turn the switch to the WED position and set the thermostat to the medium wind speed; Turn the switch to the High position and set the thermostat to high wind speed.
Installation method
1. Use a small flathead screwdriver to loosen the screws on the thermostat and remove the lower shell.
2. Connect the power cord correctly according to the wiring diagram.
3. Use the provided screws to fix the thermostat base plate to the wall, and then fasten the surface shell onto the base plate.
LCD broadcasting editor LCD temperature controller LCD temperature controller compares its measured temperature with the set temperature through electronic logic circuit, controls the fans, water valves, etc. at the end of central air conditioning, and is applied in hotels, office buildings, shopping malls, industries, medical facilities, especially villas and other civil buildings to keep the controlled environmental temperature constant within the set temperature range. This temperature controller is equipped with a remote control and can achieve remote control.
Features: Four working modes: cooling/fan/heating/automatic. Indoor fan adjustable: high speed/medium speed/low speed/automatic. Setting through jumper: single cooling/cooling/heating two pipe/cooling and heating four pipe and other modes. Two line electric valve or small air valve can be controlled. LCD display system working status: clear at a glance. LED indicates the operating status and power on status of the two-way valve. Temperature is set to increase/decrease by 1 ℃. Higher precision. Real time clock display. Room temperature correction function with weekly timed on/off. Installation method: 1 Connect the driver board (power board) of this controller to the fan coil unit, electric valve (solenoid valve or air valve), and power cord according to the requirements in the diagram. 2. Connect the LCD motherboard to the power driver board via the wiring harness. 3. Remove the back cover of the LCD motherboard and insert the power driver board into the pre embedded cassette. 4. Secure the back cover with screws. 5. Insert the panel into the back cover and complete the installation. Operation method 1: Use the power on/off button to select the system's power on or off state. 2 M： Mode key, select the control mode of the system, whether it is cooling or heating. Refrigeration is to lower the ambient temperature, otherwise it is heating. 3. Wind speed key, select the size of the output wind with the key. Wind speed can be divided into three categories: low, medium, and high. Different blades represent high, medium, and low in descending order. 4. Set the temperature. You can set the temperature level. If you need heating, the temperature you set should be higher than the indoor temperature, and the mode is heating. Otherwise, if it is lower than the indoor temperature, the mode is cooling. The principle broadcast editor temperature controller is an electrical switch device that controls the temperature of an air-conditioned room. The temperature range in the air-conditioned room controlled by the temperature controller is generally between 18 ℃ and 28 ℃. The temperature controller commonly used in window air conditioners is based on the principle of pressure to push the contacts on and off. Its structure consists of a sealed induction system and a system for transmitting signal power, consisting of a corrugated tube, a temperature sensing bulb (test tube), an eccentric wheel, a micro switch, etc.
There are generally two types of control methods; One is controlled by the temperature changes of the cooled object, often using vapor pressure temperature controllers. The other is controlled by the temperature difference changes of the cooled object, often using electronic temperature controllers. Thermostats are divided into mechanical types: vapor pressure thermostat, liquid expansion thermostat, gas adsorption thermostat, and metal expansion thermostat. Among them, vapor pressure thermostats are divided into: inflatable type, liquid gas mixed type, and liquid filled type. Mechanical home air conditioners mainly use this type of thermostat. Electronic thermostats are divided into resistance thermostats and thermocouple thermostats. The function of the circuit system: The function of the air conditioner circuit system is to control the normal and multifunctional operation of the air conditioner, and to protect the normal operation of the compressor and fan motor. The main components of the circuit system include: temperature controller, thermal protector, main control switch, operating capacitor, and the operating capacitor of the fan motor, which are fixed in the control box. The left diagram shows the electrical circuit diagram of a single cooling air conditioner. The function of the temperature controller is only to control the start and stop of the compressor. Working principle: The action of the vapor pressure bellows acts on the spring, and the elastic force of the spring is controlled by the knob on the control board. The capillary tube is placed at the air inlet of the indoor air conditioner to react to the temperature of the indoor circulating return air. When the room temperature rises to the set temperature, the temperature sensing agent gas in the capillary tube and corrugated tube expands, causing the corrugated tube to elongate and overcome the elastic force of the spring to connect the switch contacts. At this time, the compressor runs and the system cools until the room temperature drops to the set temperature again. The temperature sensing bag gas contracts, and the corrugated tube contracts and acts together with the spring, placing the switch in the off position to cut off the motor circuit of the compressor. Repeat this action repeatedly to achieve the goal of controlling the room temperature. Electronic temperature controller (resistance type) is measured using resistance temperature sensing method, generally using white gold wire, copper wire, tungsten wire, and semiconductor (thermistor, etc.) as temperature measuring resistors, each with its own advantages. The sensors of household air conditioners are mostly thermistor type. Thermistor thermostat is made based on the principle of Wheatstone bridge, as shown in the left picture, which is a Wheatstone bridge. Connect power source E to both ends of BD, according to Kirchhoff's law, when the resistance R1 × R4 of the bridge is equal to R2 × R3, the potential between points A and C is equal, and no current flows between output terminals A and C. The impedance R1 of the thermistor changes with the rise or fall of the surrounding temperature, causing the balance to be disrupted, and there is an output current between AC. Therefore, when constructing a thermostat, it is easy to change the temperature adjustment range and operating temperature by selecting an appropriate thermistor.