Section 23 09 24.doc

Modular Office Complex Building No. 365 2016005

SECTION 23 09 24

DDC SYSTEM SEQUENCES OF OPERATION

1.00

GENERAL

A.

Mechanical and electrical equipment will be provided with Adequate interfaces to the DDC system, and will be operated, controlled and monitored by the DDC system as required. The operation of the equipment will be subject to the operational modes, conditions and logic described in this Section and in accordance with the equipment manufacturer's requirements, and all applicable codes and standards. All controls will be optimized to decrease energy usage, equipment wear and maintenance, and overall life cycle costs while protecting safety.

B. All software and hardware necessary to provide these complete sequences of operation will be furnished as part of the system, even if specific operational requirements or hardware is not identified elsewhere.

c. Upon failure of any part of the DDC system, the software will perform an orderly shutdown or appropriate failure sequence and force all outputs to a maintained or predetermined state, consistent with the failure modes required.

D. All start and stop controls on fans, pumps and motors will have manufacturer's recommended restart and cycles per day equipment constraint programming.

1.01

Office Area A. General – The office area consists of 11 end mounted HVAC units or 11 trailers. The BAS shall monitor the space temperature using four space temperature sensors equally spaced throughout the building. The BAS shall stop/start the units and monitor Discharge Air Temperature and Space Temperature.

B. Electric Heat Trace – The BAS shall monitor the status or current flow of the freeze protection heating circuit.

1.02

ALARMS

General - All system information that can benefit the Government by alerting and informing the operator about system events or controlled equipment malfunctions will be programmed into an effective alarm handling system. The Contractor will program all alarms required by the Government during the first year. In addition to other alarms required, the following alarms will be programmed into the system. (Note that all setpoints will be adjustable on the graphic alarm summary by an operator at the proper level.) Contacts will be provided for Alarms 1 & 2 for future connection to the existing site central system.

1.

Lack of proof of run alarm on All AHU’s for over sixty (60)seconds will cause High Priority Alarms.

2.

All AHU’s discharge temperature under 40 or over 60 degrees F (adj) for over five (5) minutes will cause a High Priority Alarm.

3.

Lack of proof of run alarm on all heat trace for over sixty seconds shall cuase a High Priority alarm 1.03

GRAPHICS

General - All system information that can benefit the Government about the DDC system or its controlled equipment will be programmed into an effective graphic user man-machine interface. The Contractor will program all graphics required by the Government during the first year.

B.

Submittals - Man-machine graphics will be drafted by the Contractor and submitted to the Contracting Officer as screen printouts for approval. A graphics symbol legend and a graphics color convention chart will also be submitted to the Contracting Officer for approval. Fixed fields on all graphic screens will display the current time of day, the number of active, unacknowledged alarms, and the last alarm message.

C. Specific Alarms - In addition to other graphics required, the following graphics will be programmed into the system:

1.

Summary Screen - Provide a building key plan with graphic button access to all other screens, and displaying the run status of equipment, OAT, discharge temperature of all HVAC units

2.

Floor Plans - Provide floor plans adequate in number to show each room's current temperature. If more than one graphic is required, each graphic will have a key plan to allow switching to other areas.

3.

Room Current Conditions - Provide a schedule of room current conditions that displays:

a. Room Name / Space Temperature and Target/ Alarm Status.

4.

Alarm Summary - Provide a schedule of current alarm conditions that displays:

a. Alarm Point / Current Status / Minimum Limit / Deviation Limit / Maximum Limit / Alarm Silence / Out-of-Service.

1.04

REPORTS

All system information that can benefit the Government about the DDC system or its controlled equipment will be programmed into effective reports. The Contractor will program all reports required by the Government during the first year.

- END OF SECTION -

SECTION 23 09 24 Page1