JPH026972U

JPH026972U -

Info

Publication number: JPH026972U
Application number: JP8459188U
Authority: JP
Priority date: 1988-06-27
Filing date: 1988-06-27
Publication date: 1990-01-17

Description

[Brief explanation of drawings]

第１図は本考案の冷媒不足検知装置の一実施例
を示す概略ブロツク図、第２図は上記実施例の動
作を示すフローチヤートである。１……コイル温度サーミスタ、２……室温サー
ミスタ、３……マイクロコンピユータ、４……圧
縮機、６……リレーコイル、６′……リレーａ接
点、８……運転表示用ＬＥＤ、１０……故障表示
用ＬＥＤ、１１……マグネツトスイツチコイル、
１１′……マグネツトスイツチａ接点。 FIG. 1 is a schematic block diagram showing one embodiment of the refrigerant shortage detection device of the present invention, and FIG. 2 is a flowchart showing the operation of the above embodiment. 1... Coil temperature thermistor, 2... Room temperature thermistor, 3... Microcomputer, 4... Compressor, 6... Relay coil, 6'... Relay a contact, 8... Operation display LED, 10... Malfunction display LED, 11...Magnetic switch coil,
11'...Magnetic switch A contact.

Claims

[Claims for Utility Model Registration] (1) A refrigerant shortage detection device for an air conditioner that circulates refrigerant between an indoor heat exchanger and an outdoor heat exchanger via a compressor 4, which comprises: an indoor heat exchanger temperature sensor 1 that detects the temperature of the indoor heat exchanger, a room temperature sensor 2 that detects the room temperature of the room in which the indoor heat exchanger is installed, and an output of the indoor heat exchanger temperature sensor 1 and the room temperature sensor 2.
A temperature difference calculation means 3 calculates the difference between the indoor heat exchanger temperature and the room temperature based on the output of the temperature difference calculation means 3, and the absolute value of the temperature difference calculated by this temperature difference calculation means 3 is compared with a set value representing refrigerant shortage. A refrigerant shortage detection device comprising a determining means 3 for determining refrigerant shortage. (2) The refrigerant shortage detection device according to claim 1 of the above-mentioned utility model registration is provided with a timer means 3 for timing a certain period of time when the compressor 4 is started, and the refrigerant shortage detection device is provided with a timer means 3 for counting a certain period of time when the compressor 4 is started up, and the refrigerant shortage detecting device is provided with a timer means 3 for counting a certain period of time when the compressor 4 is started, and the timer means 3 is operated by a timing end signal of the timer means. A refrigerant shortage detection device in which the discrimination means 3 is activated.