My name is zafar hayat this chanel is created for sharing knowledge about electrical hvac refrigeration will discuss about all types af refrigeration systems and hvac coldrooms split ac window ac all types of ac under counter chillers freezers walk in chillers and frezer air chiller system cooling tower heat exchanger three phase single phase wiring star delta connection ako controller dixell controller eliwill will discuss all types of digital thermostate thermostatic expansion valve compressor condenser magnet contactor refrigeration cycle gas charging lp and hp switch cold rooms maintenance all types of freon charging method flushing method gas leakage testing refrigeration and air conditioning all types of machinery compressor hp split ac compressor ton compressor heat up three phase star delta diagram minibar fridge nitrogen usage brazing welding gas sand coldroom gas how to store lequid reciver solonid valve pressure reducing valve drv double regulating valve child water system