M301 HVAC Details.pdf
Posted: Aug. 25, 2026
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Summary
This **mechanical construction drawing** issued for the **U.S. Department of Veterans Affairs** addresses HVAC controls, building automation system (BAS) integration, and refrigerant-system installation requirements for the “Construct New Water Treatment Storage Facility” project in Fayetteville, Arkansas.
The drawing, identified as **M301—HVAC Details**, is dated **May 5, 2025**, applies to **Building 2**, and forms part of the mechanical construction documents for Project No. **564-19-101**.
The BAS scope requires the contractor to furnish and install a web-enabled, native **BACnet building controller and equipment controllers** capable of integrating and monitoring all new HVAC systems, with connection to the existing campus BAS front end.
The system architecture shows an existing BAS server and Windows 10 PC communicating through an Ethernet-connected BACnet Global Controller and existing BACnet MS/TP networks serving multiple buildings and equipment controllers.
For ductless split systems, the equipment must be controlled by a wall-mounted, hard-wired manufacturer-supplied thermostat with a **78°F space-temperature setpoint**.
The DDC system must monitor space temperature and generate an alarm when the temperature exceeds **90°F**.
The chlorination closet ventilation fan is identified with status and failure alarm monitoring, and the drawing indicates a typical BACnet interface arrangement for existing unitary equipment controllers.
The drawing also provides installation details for refrigerant piping, condensate drainage, pipe supports, expansion valves, and exterior protection.
Refrigerant piping must be supported using Unistrut channels, pipe straps, and specified fasteners.
Suction lines require insulation, while liquid lines require insulation only for ductless mini-splits.
Exterior refrigerant piping must receive watertight aluminum jacketing.
Expansion-valve bulbs and fittings are to be wrapped with Armaflex insulation tape and secured with black cable ties.
The bulb must be located close to the evaporator-coil outlet, with the external equalizer line installed downstream of the bulb.
The details include requirements for sight glasses, filter/dryers, service valves, gauge ports, suction-line traps or loops where applicable, condensate-drain slopes, and a minimum **5-foot** separation or routing condition shown at the condensing-unit detail.
Manufacturer-furnished refrigerant accessories may be used without duplicating accessories.
The drawing, identified as **M301—HVAC Details**, is dated **May 5, 2025**, applies to **Building 2**, and forms part of the mechanical construction documents for Project No. **564-19-101**.
The BAS scope requires the contractor to furnish and install a web-enabled, native **BACnet building controller and equipment controllers** capable of integrating and monitoring all new HVAC systems, with connection to the existing campus BAS front end.
The system architecture shows an existing BAS server and Windows 10 PC communicating through an Ethernet-connected BACnet Global Controller and existing BACnet MS/TP networks serving multiple buildings and equipment controllers.
For ductless split systems, the equipment must be controlled by a wall-mounted, hard-wired manufacturer-supplied thermostat with a **78°F space-temperature setpoint**.
The DDC system must monitor space temperature and generate an alarm when the temperature exceeds **90°F**.
The chlorination closet ventilation fan is identified with status and failure alarm monitoring, and the drawing indicates a typical BACnet interface arrangement for existing unitary equipment controllers.
The drawing also provides installation details for refrigerant piping, condensate drainage, pipe supports, expansion valves, and exterior protection.
Refrigerant piping must be supported using Unistrut channels, pipe straps, and specified fasteners.
Suction lines require insulation, while liquid lines require insulation only for ductless mini-splits.
Exterior refrigerant piping must receive watertight aluminum jacketing.
Expansion-valve bulbs and fittings are to be wrapped with Armaflex insulation tape and secured with black cable ties.
The bulb must be located close to the evaporator-coil outlet, with the external equalizer line installed downstream of the bulb.
The details include requirements for sight glasses, filter/dryers, service valves, gauge ports, suction-line traps or loops where applicable, condensate-drain slopes, and a minimum **5-foot** separation or routing condition shown at the condensing-unit detail.
Manufacturer-furnished refrigerant accessories may be used without duplicating accessories.
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