Provide two two-ton exterior wall-mounted air conditioner units (with heat strips) per equipment shelter with a lead/lag capable controller. The system must have a minimum season energy efficiency ratio (SEER) rating of 11. The Vendor shall also be responsible for removing the existing units and install new units with full functionality. The units shall have a corrosion coating in Standard Beige Baked Enamel finish. The coil and units shall have standard copper/aluminum coils. There is not a specific brand of unit that is preferred by the Department. Most units are Bard/Marvair exterior wall mounted units. All locations have 120-240 single phase voltage power. In respect to the refrigerant, utilize the newest industry standards for HVAC systems. A-2 Photos of the equipment tags are faded and many illegible. For more information, please see the attachment for additional HVAC equipment information. Ensure the system has a dry contact closure alarm output for failure monitoring and has an installed adjustable start time delay, initially set to five minutes. Each equipment shelter building will have two external units that will alternate with each other for uninterruptible cooling/heating. It is preferred that one unit always be up and running while the other is being replaced. Units can be shut down at the same time depending on the weather at the time of installation to prevent the equipment in the hub from overheating. The HVAC unit must be capable of operating when the outside temperature falls below 60º Fahrenheit (F) and has sufficient capacity to cool from a 95ºF ambient temperature to 75ºF, including the equipment heat load and provide continuous interior equipment cooling and dehumidification. The unit shall have a device installed to reduce the starting current required during a cold start or under highhead pressure conditions. Provide an internet protocol (IP) addressable thermostat controller which provides a secure web-based interface that displays the current thermostat settings and allows remote adjustments. The secure interface shall be available for use without any recurring costs. The thermostat unit shall provide transmission control protocol (TCP)/IP connection. The thermostat unit shall be capable of controlling two airconditioner units in the same building (lead/lag operation) to achieve desired temperature. Each location has secured network connections that are maintained by FDOT. FDOT will provide all network connectivity information for the static IPv4 addresses. Since all network communications are on a closed FDOT network, controllers should be able to communicate with the Transportation Management Center (TMC) and provide the lead/lag functionality. The ethernet connection capable of smart controller shall provide remote access for temperature settings (automatic adjusting to cooling/heating based on the outside and set temperature), notification for fault alarms, on/off display, and dehumidification control/status display. The controller unit shall be capable of integrating with inside or outside external sensor units.
