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Category: Control System

link to How VFDs Work in HVAC: VFD Basics & Applications

How VFDs Work in HVAC: VFD Basics & Applications

VFDs are very common in HVAC, especially new HVAC systems. They are devices that can improve the energy efficiency of various HVAC systems. So, how VFDs work in HVAC? First of all, what is a VFD?...

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link to HVAC BMS Integration: Basics, Components and Controls

HVAC BMS Integration: Basics, Components and Controls

BMS integration is becoming an essential part of HVAC. Many air conditioners, ventilation fans, sensors and controllers are remotely monitored and controlled by BMS. So, what exactly is the...

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link to How HVAC Relays Work? (Actual Applications)

How HVAC Relays Work? (Actual Applications)

Relays can be found in almost all HVAC systems. They are typically located inside HVAC control panels or within the HVAC unit itself. I've always been curious how HVAC relays work. So, I did some...

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link to What is PLC in HVAC? (CPU, Module, HMI, Analog & Digital)

What is PLC in HVAC? (CPU, Module, HMI, Analog & Digital)

Complex HVAC systems often use a PLC to control. Terms like CPU, module, HMI, AI/AO and DI/DO are common in PLC. I happened to work on a few HVAC projects with PLC. So, I decided to write a post...

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link to 5 Types of HVAC Controls (Thermostat, DDC, 0-10V & Dry Contact)

5 Types of HVAC Controls (Thermostat, DDC, 0-10V & Dry Contact)

HVAC equipment such as air conditioners, ventilation fans, chillers, cooling towers and pumps need to receive signals in order to run, stop, regulate and trip. Without signals, these machines don't...

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link to Air Conditioner Wire Sizing Guide: Chart & Calculation

Air Conditioner Wire Sizing Guide: Chart & Calculation

Apart from the electric current, wire sizes are also depending on other conditions such as ambient temperature and voltage drop. If you are dealing with air conditioners, it is inevitable that you'll...

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Hi, my name is Yu Chang Zhen. I've been working as a professional in the HVAC industry for more than 7 years, covering from design and installation to commissioning and maintenance. With my experience, I want to help people solve their HVAC problems. Welcome, I hope you can find your solutions here.

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