Fan coil unit

A fan coil unit, comprising:

• a blower comprising a volute, a wind wheel, and a motor;
• the volute comprising a first chamber, a first air inlet, a first air outlet having two sides, and a volute tongue;
• and the motor comprising an output shaft;
• a heat-exchanger housing comprising a top plate, a bottom plate, a rear plate having a second air inlet, two side plates, a second chamber, and a second air outlet;
• a heat exchanger;
• an air-guiding plate comprising an upper end, a lower end, and two side ends;
• and
• two air-guiding side plates;
• wherein:
• the wind wheel is disposed in the first chamber of the volute;
• the output shaft extends into the first chamber and is connected to the wind wheel;
• a top of the first air outlet is connected to a top of the second air inlet;
• the heat exchanger is disposed in the second chamber and is located between the second air inlet and the second air outlet;
• the volute tongue is disposed adjacent to the first air outlet;
• and the air-guiding plate is connected to the volute tongue;
• the air-guiding plate is disposed in an inclined way;
• the upper end of the air-guiding plate is connected to the volute tongue, and the lower end of the air-guiding plate extends towards the heat exchanger;
• the two air-guiding side plates are disposed at the two sides of the first air outlet, respectively;
• and the two air-guiding side plates are connected to the two side ends of the air-guiding plate, respectively;
• the lower end of the air-guiding plate is connected to the bottom plate;
• and
• the air-guiding plate is inclined with respect to the top plate at an angle a, and 75°>a>30°;
• parameters of the volute fulfill the following formula:
• Hscmax>(Hex1+Hex2);
• Hex1/D2≥0.112;
• Hex2/D2≤0.685, wherein Hscmax represents a vertical distance between a center of the wind wheel and a highest point of the volute;
• Hex2 represents a vertical distance between the top of the first air outlet and a top point of the volute tongue;
• Hex1 represents a vertical distance between the top point of the volute tongue and the center of the wind wheel;
• and D2 represents an outer diameter of the wind wheel.