First, the role of the humidity sensor:
Common faults of the humidity sensor take up a large percentage of the common faults of air conditioners. To determine the accuracy, you must first grasp its role There are three types of humidity sensors in the thermostat: indoor humidity sensor, indoor tube temperature sensor and indoor defrost humidity sensor.
1. Humidity sensor for indoor detection: The key is to monitor the indoor temperature and control the operation of the internal and external machines.
(1) Temperature regulation.
When the indoor temperature reaches the setting requirements, the external unit stops in the cooling state, and the indoor fan continues to operate in the "breeze" state; in the heating state, the indoor unit continues to blow residual hot air, and then stops.
(2) Adjust the operation mode of the air conditioner.
When the air conditioner is set to [automatic operation mode], the control system decides how the air conditioner should operate according to the current indoor temperature.
When the indoor temperature is below 20 ℃, the air conditioner automatically operates in the heating state; when the indoor temperature is between 21 and 23 ℃, it automatically operates in the dehumidified state; when the indoor temperature is above 24 ℃, it operates In a cool state.
(3) Automatically control the wind speed of the indoor unit during cooling and heating.
The user sets the temperature of the cooling room in advance as the standard. When the indoor temperature changes, the control system will adjust the size of the wind speed according to the difference between the current indoor temperature and the set temperature.
A. At the beginning of cooling in the summer, the air conditioner is first operated in the "strong cooling" block, so that the indoor fan operates in the "strong wind" block, which quickly reduces the indoor temperature; when the indoor temperature drops to 29 ℃ , The air conditioner automatically switches to the "weak cold" block, and the indoor fan operates in the "stroke" block; when the indoor temperature drops below 27 ° C, the air conditioner automatically switches to the "slightly cold" block, and the indoor fan operates also "Breeze" block.
B. During the automatic heating operation in winter, the wind speed will be adjusted according to the room temperature according to the temperature of the room. The three steps of "strong wind", "stroke", and "breeze" will be automatically adjusted to reduce the adjustment steps to meet the user Claim.
2. Indoor tube temperature probe: Installed on the air conditioner evaporator pipe, directly contact with the pipe, and closely monitor the temperature of the air conditioner evaporator coil pipe.
It has 4 functions: one is to prevent the indoor coil from freezing during summer cooling and control the indoor compressor to stop; the second is to prevent the indoor machine from blowing cold air and coils when heating in winter begins Overheating, automatic control of indoor air speed and indoor pressure