Electric heater protection device, air conditioning unit and electric heater protection method thereof

Abstract

The invention discloses an electric heater protection device, an air conditioning unit and an electric heater protection method thereof. The device comprises a fuse and a temperature limiter which arearranged on a main circuit of an electric heater; a control switch is used for controlling the power-on or power-off of the main circuit of the electric heater according to the control signal outputted by a main board; the main board is respectively connected with the control switch and an optocoupler for outputting the control signal to the control switch; when the electric heater does not worknormally, if a low level signal outputted by the optocoupler due to conduction is detected, a first prompt message for controlling the switch failure is issued. The device can solve the problems thatit is not achieved that the temperature limiter and a fuse body can effectively disconnect the main circuit of the electric heater and can detect the on and off of the electric heater, and the protection reliability is low, thereby improving the protection reliability.

Description

technical field [0001] The invention belongs to the technical field of air conditioners, and in particular relates to an electric heater protection device, an air conditioner unit (such as an air conditioner constant temperature and humidity unit) and an electric heater protection method thereof, in particular to a safe and reliable electric heater protection device, which has The air conditioning unit of the device and the electric heater protection method of the air conditioning unit. Background technique [0002] The constant temperature and humidity machine in the air conditioning unit has relatively high requirements on temperature and humidity. It is necessary to turn on the electric heater in both cooling and heating. Its protection method and whether the unit can judge whether the electric heater is disconnected are very important. At present, the electric heater protection mode adopted by the unit is: the unit uses a temperature limiter connected in series with the ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an electric heater protection device, an air-conditioning unit and a method for protecting the electric heater in view of the above-mentioned defects, so as to solve the problem that both the temperature limiter and the fuse can effectively disconnect the electric heater in the prior art. The main circuit of the heater and the ability to detect the on-off of the electric heater have the problem of low protection reliability, so as to achieve the effect of improving the protection reliability

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