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  1. What is DDC?
  2. What is Integration?
  3. Benefits of DDC control
  4. Types of DDC systems
  5. Helpful Links
  6. Helpful Documents
  7. IT Department Information.

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What is DDC

  • DDC stands for Direct Digital Control. DDC is often used to control HVAC (heating, ventilating, and air conditioning) devices such as valves via microprocessors using software to perform the control logic. Such systems receive analog and digital inputs from the sensors and devices installed in the HVAC system and, according to the control logic, provide analog or digital outputs to control the HVAC system devices. These systems may be mated with a software package that graphically allows operators to monitor, control, alarm and diagnose building equipment remotely. Definition from 


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What Is Integration

  • Simply put DDC integration is the process of making multiple devices from multiple manufactures work and play nice together. Integration platforms can be PC's or network appliances  such as the InetSupervisor™  or using common computer technologies such as OPC, TCP/IP, XML  to name a few. Integration helps reduce installation and upgrade costs and allows end-users a path to easy upgrades.
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DDC Benefits

  • Energy use control and monitoring. By adding your mechanical systems to a DDC system you can control energy cost. From limiting temperature adjustments to demand ventilation and metering a properly installed and maintained system can reduce energy costs significantly.
  • Increase equipment life and Reduce downtime. By utilizing a system with trend logs and lead lag programming equipment life is increased by managing run times. With a DDC system information gathered can be used to predict and avoid downtime.
  • Faster more accurate service response. With a properly installed system building engineers and service technicians can often identify issues before the phone starts ringing, keeping your customers and tenants happy and comfortable.
  • Tenant services. Building managers can track and bill for use during non-contract occupancy by monitoring such things as occupancy, systems can be brought on as needed while tracking use for billing or planning purposes.    
  • Meeting and Event scheduling. Schedules can be entered for meeting and banquet rooms, some DDC systems work with common computer programs that allow for the automatic set-up of an event reducing human error and planning time.

These are just a few a the benefits every site has special needs that can be addressed and automated through DDC systems, Call today for a site evaluation  1-703-339-2112

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DDC System Types

  • Legacy Systems. Sometimes referred to as propriety systems, are historically older systems that follow no industry standard for data communication. These systems typically work well but often lock customers into a much more narrow vendor and service company option.  In addition they don't always share information with modern computer standards.
  • BACnet. BACnet is widely considered to be an Open system, that is to say any BACnet certified device can work on any BACnet network. This option allows customers to pick from a much larger pool of product manufactures and service providers
  • LonWorks. LonWorks like BACnet is considered an open system, manufactures and service companies for this protocol are widely available both BACnet and LonWorks allow for not only increased service provider selection but they also work well with many of today's computer and internet standards.      
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Helpful Links

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IT and DDC