1、09-11 23 09 23 - 1 SECTION 23 09 23 DIRECT-DIGITAL CONTROL SYSTEM FOR HVAC SPEC WRITER NOTES: 1. Delete between / - / if not applicable to project. Also delete any other item or paragraph not applicable in the section and renumber the paragraphs. 2. Engineer shall provide control schematics, operati
2、ng sequences, DDC Control object lists, and Gateway Interoperability Schedules on the drawings. 3. Control schematics shall describe each HVAC system. For example schematics shall be provided for the chilled water system, the heating water system, the condenser water system, each air handling system
3、, the lab exhaust system, the general exhaust system, etc. 4. Operating sequences shall be written in the component style: it shall include descriptions of how each component behaves in each operating mode. 5. The DDC control object list shall include for each “point name” the following columns: har
4、dware point/ analog input, hardware point/analog output, hardware point/binary input, hardware point/binary output, software point/analog value, software point/ binary value, software point schedule, trending (interval or differential value or change of value), and if the point should appear on a gr
5、aphic. 6. The gateways interoperability schedules shall include for each device access through the gateway a listing of all of the BIBBs required through the gateway. PART 1 - GENERAL 1.1 DESCRIPTION A. Provide (a) direct-digital control system(s) as indicated on the project documents, point list, i
6、nteroperability tables, drawings and as described in these specifications. Include a complete and working direct-digital control system. Include all engineering, programming, controls and installation materials, installation labor, commissioning and start-up, training, final project documentation an
7、d warranty. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-11 23 09 23 - 2 1. The direct-digital control system(s) shall consist of high-speed, peer-to-peer network of DDC controllers, a control system server, and an Engineering Control Center. P
8、rovide a remote user using a standard web browser to access the control system graphics and change adjustable setpoints with the proper password. 2. The direct-digital control system(s) shall be native BACnet. All new workstations, controllers, devices and components shall be listed by BACnet Testin
9、g Laboratories. All new workstations, controller, devices and components shall be accessible using a Web browser interface and shall communicate exclusively using the ASHRAE Standard 135 BACnet communications protocol without the use of gateways, unless otherwise allowed by this Section of the techn
10、ical specifications, specifically shown on the design drawings and specifically requested otherwise by the VA. SPEC WRITER NOTE: Gateways, if used, shall be of sufficient quantity, capacity, and processing speed to allow for extensive trending and controller-level adjustment of controlled devices in
11、 VA healthcare and lab facilities. Gateways, if used, shall be of sufficient quantity, capacity, and processing speed to allow for limited trending and supervisory-level adjustment of controlled devices in other VA facilities. a. If used, gateways shall support the ASHRAE Standard 135 BACnet communi
12、cations protocol. SPEC WRITER NOTE: Design engineer shall indicate on drawings interoperability schedules for each gateway. The interoperability schedules shall include the following information: for each device access through the gateway, list all of the BACnet Interoperability Building Blocks (BIB
13、Bs) required for adequate interoperability. See ASHRAE Standard 135, Annex K for a description of available BIBBs. b. If used, gateways shall provide all object properties and read/write services shown on VA-approved interoperability schedules. SPEC WRITER NOTE: Gateways are often used to interface
14、with the internal controls of engineered equipment or systems such as chillers, packaged rooftop air conditioners, skid-mounted pressure Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-11 23 09 23 - 3 booster pump systems and similar. Engineer sha
15、ll investigate those internal controls, and make sure that those internal controls do not control other pieces of equipment, such as the start/stop of chilled water pumps, condenser water pumps or cooling towers. Deferring control of equipment external to the equipment viewed through the gateway imp
16、oses undue problems on troubleshooting the HVAC systems controls. 3. The work administered by this Section of the technical specifications shall include all labor, materials, special tools, equipment, enclosures, power supplies, software, software licenses, Project specific software configurations a
17、nd database entries, interfaces, wiring, tubing, installation, labeling, engineering, calibration, documentation, submittals, testing, verification, training services, permits and licenses, transportation, shipping, handling, administration, supervision, management, insurance, Warranty, specified se
18、rvices and items required for complete and fully functional Controls Systems. 4. The control systems shall be designed such that each mechanical system shall operate under stand-alone mode. The contractor administered by this Section of the technical specifications shall provide controllers for each
19、 mechanical system. In the event of a network communication failure, or the loss of any other controller, the control system shall continue to operate independently. Failure of the ECC shall have no effect on the field controllers, including those involved with global strategies. SPEC WRITER NOTE: E
20、dit the number of Engineering Control Center (ECC) workstation locations and web-based users in the paragraph below after discussing with the VA facility. The VA typically has only one ECC in each facility. 5. The control system shall accommodate / 1 / 2 / Engineering Control Center(s) and the contr
21、ol system shall accommodate / 5 / 10 / 20 / web-based Users simultaneously, and the access to the system should be limited only by operator password. B. Some products are furnished but not installed by the contractor administered by this Section of the technical specifications. The contractor admini
22、stered by this Section of the technical specifications shall formally coordinate in writing and receive from other contractors Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-11 23 09 23 - 4 formal acknowledgements in writing prior to submission t
23、he installation of the products. These products include the following: 1. Control valves. 2. Flow switches. 3. Flow meters. 4. Sensor wells and sockets in piping. 5. Terminal unit controllers. C. Some products are installed but not furnished by the contractor administered by this Section of the tech
24、nical specifications. The contractor administered by this Section of the technical specifications shall formally coordinate in writing and receive from other contractors formal acknowledgements in writing prior to submission the procurement of the products. These products include the following: 1. /
25、Refrigerant leak detection system./ 2. Factory-furnished accessory thermostats and sensors furnished with unitary equipment. D. Some products are not provided by, but are nevertheless integrated with the work executed by, the contractor administered by this Section of the technical specifications. T
26、he contractor administered by this Section of the technical specifications shall formally coordinate in writing and receive from other contractors formal acknowledgements in writing prior to submission the particulars of the products. These products include the following: 1. Fire alarm systems. If z
27、oned fire alarm is required by the project-specific requirements, this interface shall require multiple relays, which are provided and installed by the fire alarm system contractor, to be monitored. 2. /Advanced utility metering systems. These systems may take information from the control system or
28、its component meters and sensors. There is no command or control action from the advanced utility monitoring system on the control system however./ 3. /Boiler and/or chiller controls. These controls, if not native BACnet, will require a BACnet Gateway./ 4. Terminal units velocity sensors 5. /Condens
29、er water quality systems: condenser water high- and low-parts hydrogen (pH) alarms./ Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-11 23 09 23 - 5 6. Unitary HVAC equipment (/rooftop air conditioning units, split systems, packaged pumping statio
30、ns/, / /) controls. These include: a. /Discharge temperature control./ b. /Economizer control./ c. /Flowrate control./ d. /Setpoint reset./ e. /Time of day indexing./ f. /Status alarm./ 7. Variable frequency drives. These controls, if not native BACnet, will require a BACnet Gateway. 8. The followin
31、g systems have limited control (as individually noted below) from the ECC: a. /Constant temperature rooms: temperature out of acceptable range and status alarms./ b. /Process and food service coolers, refrigerators and freezers: in patient nutrition kitchens, blood banks, mortuaries, and pharmacies:
32、 high temperature, trending and status alarms./ c. /Medical gas systems (if not bottled at point of use): low pressure and status alarms./ d. /Medical and dental vacuum systems: high pressure and status alarms./ e. /Medical and dental compressed air systems: low pressure and status alarms./ f. /Emer
33、gency generators: status alarms./ g. /Domestic water heating systems: low temperature, high temperature and status alarms./ h. /Pneumatic tube systems: status alarms./ i. /Elevators: status alarms./ j. /Building lighting systems: on/off and scene control./ k. /Process conveyors: on/off control./ l.
34、/Stormwater removal pumps: status alarm./ m. /Sanitary sewage pumps: status alarm./ n. /Fume hoods and biological safety cabinets: status alarms/ o. /Isolation rooms: pressure outside of acceptable limit alarms./ E. Responsibility Table: Provided by IHSNot for ResaleNo reproduction or networking per
35、mitted without license from IHS-,-,-09-11 23 09 23 - 6 Work/Item/System Furnish Install Low Voltage Wiring Line Power Control system low voltage and communication wiring 23 09 23 23 09 23 23 09 23 N/A Terminal units 23 23 N/A 26 Controllers for terminal units 23 09 23 23 23 09 23 16 LAN conduits and
36、 raceway 23 09 23 23 09 23 N/A N/A Automatic dampers (not furnished with equipment) 23 09 23 23 N/A N/A Automatic damper actuators 23 09 23 23 09 23 23 09 23 23 09 23 Manual valves 23 23 N/A N/A Automatic valves 23 09 23 23 23 09 23 23 09 23 Pipe insertion devices and taps, flow and pressure station
37、s. 23 23 N/A N/A Thermowells 23 09 23 23 N/A N/A Current Switches 23 09 23 23 09 23 23 09 23 N/A Control Relays 23 09 23 23 09 23 23 09 23 N/A Power distribution system monitoring interfaces 23 09 23 23 09 23 23 09 23 26 Interface with chiller/boiler controls 23 09 23 23 09 23 23 09 23 26 Chiller/bo
38、iler controls interface with control system 23 23 23 09 23 26 All control system nodes, equipment, housings, enclosures and panels. 23 09 23 23 09 23 23 09 23 26 Smoke detectors 28 31 00 28 31 00 28 31 00 28 31 00 Fire/Smoke Dampers 23 23 28 31 00 28 31 00 Smoke Dampers 23 23 28 31 00 28 31 00 Fire
39、Dampers 23 23 N/A N/A Chiller/starter interlock wiring N/A N/A 26 26 Chiller Flow Switches 23 23 23 N/A Boiler interlock wiring 23 23 23 26 Boiler Flow Switches 23 23 23 N/A Water treatment system 23 23 23 26 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from I
40、HS-,-,-09-11 23 09 23 - 7 Work/Item/System Furnish Install Low Voltage Wiring Line Power VFDs 23 09 23 26 23 09 23 26 Refrigerant monitors 23 23 09 23 23 09 23 26 Laboratory Environmental Controls 23 09 23 23 09 23 23 09 23 26 Fume hood controls 23 09 23 23 09 23 23 09 23 26 Medical gas panels 23 23
41、 26 26 Laboratory Air Valves 23 23 23 09 23 N/A Computer Room A/C Unit field-mounted controls 23 23 16 26 Control system interface with CRU A/C controls 23 09 23 23 09 23 23 09 23 26 CRU A/C unit controls interface with control system 23 23 09 23 23 09 23 26 Fire Alarm shutdown relay interlock wirin
42、g 28 28 28 26 Control system monitoring of fire alarm smoke control relay 28 28 23 09 23 28 Fire-fighters smoke control station (FSCS 28 28 28 28 Fan Coil Unit controls (not furnished with equipment) 23 09 23 23 09 23 23 09 23 26 Unit Heater controls (not furnished with equipment) 23 09 23 23 09 23
43、23 09 23 26 Packaged RTU space-mounted controls (not furnished with equipment) 23 09 23 23 09 23 23 09 23 26 Packaged RTU unit-mounted controls (not furnished with equipment) 23 09 23 23 09 23 23 09 23 26 Cooling Tower Vibration Switches 23 23 23 09 23 23 09 23 Cooling Tower Level Control Devices 23
44、 23 23 09 23 23 09 23 Cooling Tower makeup water control devices 23 23 23 09 23 23 09 23 Starters, HOA switches 23 23 N/A 26 SPEC WRITER NOTE: Include the following paragraph if working within an existing Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,
45、-,-09-11 23 09 23 - 8 facility which contains an existing legacy direct-digital control system. F. This facilitys existing direct-digital control system is manufactured by / /, and its ECC is located at / /. The existing systems top-end communications is via / /. The existing systems ECC and top-end
46、 controllers were installed in / /. The contractor administered by this Section of the technical specifications shall observe the capabilities, communication network, services, spare capacity of the existing control system and its ECC prior to beginning work. SPEC WRITER NOTE: The following four par
47、agraphs describe the varying levels of interface/upgrade of existing control systems. Choose one. The VA prefers that all control systems be replaced with native BACnet systems (paragraph one). The subsequent paragraphs (paragraphs two through four) are provided for use if the VA determines that a c
48、omplete upgrade of the direct digital control system to native BACnet is not technically feasible or cannot be funded. Explicit written approval by the VA must be granted before using any of the subsequent paragraphs. 1. /Remove existing direct-digital control system ECC, communications network and
49、controllers. Replace with new BACnet ECC, network and controllers compliant with this Section of the technical specifications./ SPEC WRITER NOTE: The following paragraph describes an upgrade of the existing legacy direct-digital control system to a BACnet system: the ECC is replaced, a new Ethernet communications
