Regular maintenance is key to ensuring your system is working properly. SAM Mechanical Services, LLC technicians are proud to provide preventative maintenance for your DDC systems to avoid any costly repairs that may be prevented. Our team is knowledgeable about the types of maintenance needed for each specific system. Larger buildings will have a more complex system of controllers than one used in a home. Advanced systems are broken into different tiers for easy monitoring and maintenance. First Tier - This is the central workstation that will control all aspects of the DDC system. It receives, processes, stores, sends, and prints data integral to running a successful HVAC system. This is the point where you would be able to monitor issues that arise, change the temperature, and plan out a heating/cooling plan. Second Tier - This is the system controller that takes the information from the first tier, and decodes it for the third tier. Third Tier - A series of terminal controls is programmed to control one piece of equipment per each control. Each of the tiers work in conjunction with one another to keep the HVAC system running smoothly.