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The air conditioning temperature sensor is a core component in the air conditioning system used to detect the temperature of the environment or components. Its function is to convert temperature signals into electrical signals for the air conditioning control system to automatically adjust the operating state. By sensing temperature changes and converting them into resistance or voltage signals, it helps air conditioners achieve precise temperature control, energy-saving operation and safety protection.
Negative temperature coefficient (NTC) thermistors, whose resistance decreases as the temperature rises (temperature ↑→ resistance ↓). Fast response and low cost, it is widely used for indoor and outdoor temperature detection in household air conditioners. For platinum resistance (PT1000), its resistance value increases with the rise in temperature (temperature ↑→ resistance ↑). It features high precision and strong stability, and is widely used in commercial air conditioning or precise temperature control scenarios. The common ones are as follows:
1. Indoor environmental temperature sensor: The indoor environmental temperature sensor is usually installed at the air outlet of the indoor unit's heat exchanger. Its main functions are threesome: First, to detect the indoor temperature during cooling or heating and control the operating time of the compressor; The second is to control the working status in the automatic operation mode. The third is to control the rotational speed of the indoor fan.
2. Indoor coil temperature sensor: The indoor coil temperature sensor features a metal casing and is installed on the surface of the indoor heat exchanger. Its main functions are fourthly: Firstly, it provides protection against overcooling during refrigeration. The second is overheat protection during heating. The third is to control the rotational speed of the indoor fan motor; Fourth, it is used to assist in outdoor defrosting during the heating period.
3. Outdoor environmental temperature sensor: The outdoor environmental temperature sensor is installed on the outdoor heat exchanger through a plastic frame. It has two main functions: one is to detect the outdoor environmental temperature during cooling or heating, and the other is to control the speed of the outdoor fan with a direct current.
4. Outdoor coil temperature sensor: The outdoor coil temperature sensor features a metal casing and is installed on the surface of the outdoor heat exchanger. It has three main functions: first, to prevent overheating during cooling; second, to prevent freezing during heating; and third, to control the temperature of the heat exchanger during defrosting.
5. Compressor exhaust temperature sensor: The compressor exhaust temperature sensor also features a metal casing. It is installed on the compressor exhaust pipe and has two main functions: one is to control the opening degree of the expansion valve and the compressor speed by detecting the temperature of the compressor exhaust pipe; the other is to provide overheat protection for the exhaust pipe.
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