NA7.5.10 Automatic Demand Shed Control Acceptance

Use Form NRCA-MCH-11-A

Purpose of the Test

All control systems with DDC to the zone level are required to enable centralized demand shed at non-critical control zones from a single software or hardware point in the system §120.2(h). Field studies have shown that in typical commercial buildings resetting the zone temperatures up by 2°F to 4°F during on-peak times can reduce the peak electrical cooling demand by as much as 30 percent. This test is to ensure that the central demand shed sequences have been properly programmed into the DDC system

Instrumentation

The instrumentation needed to perform the task may include, but is not limited to:

•      The front end computer to the DDC system

Test Conditions

To perform the test, it will be necessary to use the control system to manipulate system operation to achieve the desired control.The entire HVAC and control system must be complete to perform this test.

Estimated Time to Complete

Construction inspection: 0.5 hour to review the EMCS programming

Functional testing: 0.5 to 1 hour (depending on familiarity with BAS)

Acceptance Criteria

The control system changes the setpoints of non-critical zones on activation of a single central hardware or software point then restores the initial setpoints when the point is released.

Potential Problems and Cautions

Difficulties could be encountered with manipulating the control system if not familiar with the programming language.  Therefore, a controls contractor should be on-site to assist with the testing.