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.� .A.9. Walk WadeMPP' CHP /ELI Combustion Heat & Power Mechanical & Electrical Services A Division of NAC 1001 Labore Industrial Court, Suite B Vadnais Heights, Minnesota 55110 tel: 651-490-9868 fax: 651-490-1636 August 22, 2017 Mr. Tim Hillesheim City of Lino Lakes 600 Town Center Parkway Lino Lakes MN 55014-1182 Re: Lino Lakes Automation Integration and Upgrade Mr. Hillesheim Current Situation: The city of Lino Lakes currently utilizes Johnson Metasys Automation to control the main air handling equipment and HVAC system in the City Hall, Early Learning Center, and Police Station. As of June 30, 2015, Johnson Controls discontinued the manufacturing and sales of these controllers (see attached bulletin from Johnson). The remainder of the individual vav and thermostats that make up the building controls are using pneumatics (air) automation, which at the time of installation was a practice not widely used anymore. The pneumatics are not currently and cannot be interfaced with today's automation controls and have to run as a basic unintelligent system that cannot adapt to today's changing interior climates and needs. As interior heat and cooling loads change and the amount of fresh air requirements change per codes, pneumatics cannot change with these needs. Pneumatics is less efficient than electronic controls and require constant service to maintain and operate the system as efficiently as possible. Preventative maintenance is crucial and time consuming for a pneumatic control system as a controller can fall out of calibration within a 4-8 month period and should be calibrated at minimum 2 times per year. Pneumatic controls also require the use of an air compressor and air drier to supply the correct air pressure with minimum moisture circulation in the pneumatic lines. This added equipment requires preventive maintenance and yearly replacement of air & oil filters, oil changes and belts to keep the system running at peak performance. Currently the city hall office wing has had conversion of VAV's to Alerton automation as the existing pneumatics have failed and the new fire station #2 has full Alerton building automation. The City currently owns the Alerton automation software and by extending this existing infrastructure this can be a very cost effective way to replace the failing pneumatics and legacy Johnson system. Some Advantages to extension of the Alerton automation are the city staff is familiar with the software and operations and the integration between Fire Station#2 and City Hall would allow the Lino Lakes Maintenance staff to monitor and view any city site with Alerton from anywhere in the city or at home for afterhours calls or monitoring. wwM'.nac-hvac.com, 24 Hour Service An Affirmative Action, Equal Employment Opportunity Employer Direct (651) 255-3527 Fax (651) 490-1636 Cell (651) 230-8971 Email skotzmacher@nac-hvac.com HVAC Mechanical - Building Automation - Electrical - Plumbing - Sheet Metal - Preventative Maintenance - Service Repairs - Combustion Services - Communications