Direct Digital Controls Category Index

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Benefits of Building Automation Systems | HVAC Controls

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Benefits of Building Automation Systems - Modern buildings use DDC controls for building automation systems. Building automation systems offer energy savings because they are energy management systems. These systems allow management to automatically control many...

Direct Digital Controls Commissioning | Building Automation Systems

by High Performance HVAC | Direct Digital Controls | 4 Comments

Direct Digital Controls Commissioning | Building Automation Systems - Preface -This article is not all-inclusive of everything required to properly commission a control system. I wrote this because of my observations of a colleague. The colleague called me in as a...

DDC Control Loop | Building Automation

by High Performance HVAC | Direct Digital Controls | 2 Comments

DDC Control Loop | Building Automation - Direct Digital Controls are nearly everywhere in commercial and some industrial processes. We have several articles here at High Performance HVAC, which describe the basics of DDC and how DDC works. There is also a page here...

Air Handler Equipment DDC Controllers | HVAC Control

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Air Handler Equipment DDC Controllers - These controllers will control an air handler once the wiring is completed. The panel is freshly mounted and waiting for the technician to run the piping and pull the wire from the control points. Other points, such as outside...

How DDC Status Works – Methods and Types | HVAC Control

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How DDC Status Works - DDC and Status – Is the Device On or Off The basics of DDC include learning about the status of a fan or a compressor or pump. How does a DDC controller read the status of the device it is monitoring? There are several ways to prove a device is...

HVAC Control and Direct Digital Controls 2 | DDC & BAS

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HVAC Control and Direct Digital Controls 2 - An HVAC technician who knows nothing about HVAC control systems would wonder how these HVAC control systems work. To understand HVAC controls, one must understand basic electricity and circuits. HVAC Control and Direct...

Rooftop Economizer CO2 | HVAC Control

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Rooftop Economizer CO2 | HVAC Control - This damper is part of a free cooling system for a rooftop economizer. It is part of an economizer damper system that allows free outside air cooling when the outside air temperature and humidity are ideal. This economizer also...

DDC Automated Logic M-Stack | HVAC Control

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DDC Automated Logic M-Stack - This Automated Logic M-Stack provides a control for multiple pieces of HVAC equipment and integrates network communication all in one single stack. This direct digital control system is integrated with pneumatic controls. DDC allows...

Building Automation Systems | HVAC Control

by High Performance HVAC | Direct Digital Controls | 15 Comments

What you will learn from this Building Automation Systems article: The efficiency and conveniences Building Automation Systems add to the building control systems and HVAC systems How Building Automation enhances building energy savings and...

BAS DDC Learning | HVAC Skills

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BAS DDC Learning | HVAC - HVAC Building Automation Systems (BAS) or Direct Digital Controls (DDC) is pretty much one and the same. Basically described BAS and DDC are combining air conditioning, heating, ventilation, lighting, electrical loads, security systems, and...

DDC Control Module for an Air Handling Unit | HVAC Control

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DDC Control Module for an Air Handling Unit - This is a direct digital controls control module for an air handler that serves some VAV boxes in office spaces for a Data Center. This DDC control module includes analog and digital inputs and analog and digital outputs...

DDC Controlled Chilled Water Actuator | HVAC Automation

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DDC Controlled Chilled Water Actuator | HVAC Automation. This chilled water actuator is attached to a valve which supplies chilled water to the air handling unit. The air handling has a chilled water coil. The actuator modulates the valve based on a set point inside...

DDC Outside Air Economizer System | HVAC Control

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DDC Outside Air Economizer System - Outside louvers allow the DDC control system to open dampers and introduce fresh air into the building. Building automation system, or the energy management system as it is sometimes called, monitors outside air temperature and...

HVAC 3R NEMA Rated Control Panels | DDC Installation

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HVAC 3R NEMA Rated Control Panels - These control panels offer resistance to inclement weather. They house the DDC controllers for two small chillers and two air handlers. The chillers provide chilled water for air conditioning to the air handlers. HVAC 3R NEMA Rated...

HVAC Control Transformer Bank | DDC Installation

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HVAC Control Transformer Bank - This bank of transformers is being used to power several VAV box controllers. One of many VAV boxes is powered by one of these transformers. In most VAV box applications, the power for the control system is at the box and a properly...

Outside Air Temperature-Humidity Sensor | HVAC Control

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Outside Air Temperature-Humidity Sensor - The outside air temperature sensor uses a thermistor to read the outside temperature. This sensor also senses humidity using a humidity transducer. The temperature and humidity readings are collected by a direct digital...

DDC Integration | HVAC DDC Controls

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DDC Integration | HVAC DDC Controls - This is an electrical project which is in the process of changing the old control system to a new DDC control system. Installing new controls in an occupied building takes plenty of planning to avoid interruption in air...

SCADA Supervisory Control and Data Acquisition

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SCADA Supervisory Control and Data Acquisition - SCADA Gear in a large data center provides supervisory control and data acquisition (SCADA) to maintain electrical and mechanical equipment. SCADA System is used in many different industries for controls and security...

Alerton BTI DDC Controller Building Automation

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Alerton BTI DDC Controller Building Automation - This is the main DDC controller for Alerton. It communicates with all the other controllers in the field serving the building automation system and connects those systems with a computer or modem. Alerton BTI DDC...

Direct Digital Controls DDC | HVAC Control

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Direct Digital Controls DDC or DDC Systems offer a high level of control for building mechanical and electrical systems. Additionally, the modern state-of-the-art direct digital controls have the ability to offers trends of data points of HVAC/Electrical equipment....

DDC Programming Logic Symbols 1 | HVAC Control

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DDC Programming Logic Symbols 1 - DDC programming in HVAC Control can be rather complex especially to those who don’t understand software or programming. Some software and hardware manufacturers utilize symbols to build their logic programs for HVAC DDC control. Some...

Variable Speed Drives | HVAC Control

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In HVAC a variable speed drive is a speed control system for electric motors. The variable speed drive (VSD) or variable frequency drive (VFD), among other names (adjustable-frequency drives (AFD), AC drives, micro-drives, or inverter drives). The application of...

HVAC Control DDC Programming Logic 3

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DDC Programming Logic 3 - DDC control logic blocks have practically an unlimited way of arranging the blocks for HVAC control. Below is an example of a line of logic blocks arranged for static pressure control of a VAV air handler supply fan using a variable frequency...

HVAC Control Programming DDC Logic 2

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Programming DDC Logic 2 - Analog Network Input Programming DDC Logic 2 - The analog network input is similar to an analog input except this input is not hardwired to the local controller but on a remote controller in the network. It is very important that the...

Duct Temperature Sensor

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Duct Temperature Sensor - The duct static temperature sensor measures air temperature in the ductwork. The solid-state temperature sensing devices are commonly used in HVAC applications that are controlled by direct digital control or a modern building automation...

Alerton Controllers DDC HVAC Control | Heating & Cooling

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Alerton Controllers DDC HVAC Control - HVAC DDC control has become an integral part of building automation systems. Modern DDC HVAC Control is a state-of-the-art computer-controlled system that adds efficiency to the system. These Alerton controllers are used to...

York Variable Frequency Drives VFDs | HVAC Control

by High Performance HVAC | Direct Digital Controls | 2 Comments

York Variable Frequency Drives VFDs | HVAC Control - Variable Frequency Drives or VFDs have added a whole new dimension to energy efficiency and control. These drives, or VFDs, are hooked up to two different York VAV air handlers that have two three-phase motors a...

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HVAC Tip - According to studies done by the Department of Energy, 50 percent of the heat loss experienced in the average home occurs through the ceiling. That makes a lot of sense since heat rises. You can reduce that heat loss (heat gain in the summer months) by adding another layer of insulation in the attic. That will hold more heat in our homes for a longer period of time which means the furnace will cycle less. That means you are going to save money. A lot more money than another layer of insulation costs. Additionally, having an attic fan controlled by a thermostat installed in your attic will remove a lot of heat in the summer. This will help you, in addition to having more insulation, reduce heat gain from the attic in the summer.