HVAC System Functional Specification | Integrated Automation System

This article is about general and Functional Specification for HVAC System used in Integrated Automation System or Building Automation System.

HVAC System Functional Specification | Integrated Automation System

HVAC System

1. The HVAC system shall be provided with communication capabilities to be integrated into the IAS through the FACLAN building network. Communication systems shall be non-proprietary open systems such as BACnet or Modbus.
2. In occupancy mode, the HVAC system shall be engaged. In addition to the aforementioned, the following will be conducted in occupancy mode;
   • Upon the identified presence of a tenant via the occupancy sensors, the HVAC control system shall initiate a demand control ventilation (calculated OA CFM) program based on number of occupants present in a large occupied HVAC zones (non-office or large open office).
   • Optimum start times for HVAC equipment shall be utilized during occupancy mode.
   • The HVAC control system shall totalize room occupancy per OA Zone to enable demand based outside air delivery.
   • During Demand Response – Level 2, the Chiller units shall increase its leaving chilled water temperature by 2 deg F.
   • During Demand Response – Level 2, the AHU units shall increase its discharge air temperature by 2 deg F
3. In un-occupancy mode, the HVAC system shall be disengaged and placed in standby (unless optimum start programming is active or engaged). The following will be conducted in un-occupancy mode;
   • The HVAC shall be engaged during temporary occupancy and shall remain on for a pre-determined duration of time
4. In emergency mode, the HVAC system shall be partially engaged. The following will be conducted in emergency mode;
   • The AHUs and Smoke Exhaust Fans shall be sequenced per approved Smoke Control Sequence.

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