11-06-2017 Council Packet - Laserfiche WebLink

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A r` David W Carlson 651-255-3536 Direct 1001 Labore Industrial Court, Suite B 651-230-7705 Cell Vadnais Heights, MN 55110 dcarlson@nac-hvac.com October 12, 2017 Mr. Tim Hillesheim City of Lino Lakes 600 Town Center Parkway Re: Summary of conditions of City Hall campus air conditioning units Mr. Hillesheim We are experiencing random failures and lock out of the City Hall 20 -ton unit which supplies air conditioning to the City Hall data equipment and production equipment, council chambers, conference rooms and city hall vestibule area. Stage one compressors run the most and is starting to fail. If this unit fails during cooling season there would be a good chance that the City computer servers could go down due to extreme temperatures, affecting all aspects of the city infrastructure. This would also affect the production equipment and may not allow council meetings to be broadcast if equipment overheats. New Creations wing is having random failures of the first stage cooling causing the unit to lock out and prevent cooling for their leased space of the City Hall complex. The age of the Campus has approached and in some instances exceeds the average life expectancy of most of the mechanical equipment as tracked by industry standards of the American Society of Heating and Air Conditioning Engineers (ASHRAE). We have experienced minor failures of some of the mechanical equipment over the last few years and have now experienced two major failures and are in need of making a decision for the best solution moving forward. NAC is recommending that the city replace the two air conditioning systems that are experiencing failure and are at end of life expectancy. Our recommendation for replacement of this equipment is driven by its age and the 1987 Montreal Protocol on Substances that Deplete the Ozone Layer which called for the phase out of R22 refrigerant. This has caused volatility of the market and has driven the cost of R22 refrigerant extremely high with limited supplies now, and less in the future. Factoring these items together with the comparable cost to repair versus replace we believe it is in the best interest of the City to start moving forward with a plan to replace the units to help control the cost by replacing on a scheduled install and not an emergency need. Mechanical $ Electrical : Fabrication 4 Building Technology s 24 Hour Service