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604.2 Heating, Ventilating and Air-Conditioning (HVAC) Systems Equipped With Direct Digital Control (DDC)
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HVAC systems with direct digital control (DDC) to the zone level shall be programmed to allow centralized demand shed for noncritical zones in accordance with the following:
- The controls shall have a capability to remotely set up the operating cooling temperature setpoints by 4°F (2.2°C) or more in all noncritical zones on signal from a centralized contact or software point within an energy management control system (EMCS).
- The controls shall have a capability to remotely set down the operating heating temperature setpoints by 4°F (2.2°C) or more in all noncritical zones on signal from a centralized contact or software point within an EMCS.
- The controls shall have capabilities to remotely reset the temperatures in all noncritical zones to original operating levels on signal from a centralized contact or software point within an EMCS.
- The controls shall be programmed to provide an adjustable rate of change for the temperature setup and reset.
- The controls shall have the following features:
- Be accessible to authorized facility operators.
- Be equipped with a manual control to allow adjustment of heating and cooling setpoints globally from a single point.
- Shall direct the space-conditioning systems to conduct a centralized demand shed, as specified for noncritical zones during the demand-response period, upon receipt of a demand-response signal.
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