Section 23 09 23.doc

Modular Office Complex Building No. 365 2016005

SECTION 23 09 23

DIRECT DIGITAL CONTROL (DDC) SYSTEM

PART 1

GENERAL

1.01

DESCRIPTION OF WORK

A.

This Section describes the Direct Digital Control (DDC) System to control and monitor the equipment and systems as required. The system shall be manufactured by Andover Controls.

B.

The DDC System shall be expandable by the addition Remote Control Panels, Field Equipment Panels, sensors, control devices, and all required interconnections to accommodate future expansion of the facility.

C.

The work shall consist of providing Remote Control Panels (RCPs), Field Equipment Panels (FEPs), field sensors and control devices, pneumatic piping and electrical wiring to provide the building(s) with a complete and operable system as specified herein. The system provided shall be a complete functional system with all necessary hardware and software/con- figuration provided.

D.

The DDC System shall perform control algorithms, calculations and all monitoring functions. The DDC System shall provide operator interaction and dynamic process manipulation, including overall system supervision, coordination and control. In addition, the DDC System shall generate specified reports. Every connected Analog Output (AO), Analog Input (AI), Digital Output (DO), and Digital Input (DI) represents a "point" where referred to in this Specification.

1.02

RELATED WORK SPECIFIED ELSEWHERE

A.

General Requirements - Division 1.

B.

Instrumentation and Control Equipment - Section 15910.

C.

DDC System Sequences of Operation

D.

Electrical - Division 16.

1.03

REFERENCE CODES AND STANDARDS

Comply with all codes referenced in Division 1.

1.04

SUBMITTALS

General - Comply with all requirements of Division 1.

Shop Drawings - Submit shop drawings following the format and symbology of the contract drawings, including complete single-line diagrams, schematic diagrams, wiring diagrams, software descriptions, calculations, and all other details required to demonstrate that the system has been coordinated and will properly function as a system. Provide outline dimensions, mounting details, weights, power requirements, console/cabinet/ panel arrangements, system functional descriptions, Input/Output Summary and I/O signal conditioning requirements. Show complete system operation, including all required references to other drawings where equipment is to be interconnected or continued. Specific calculations and other information to be submitted shall include, as a minimum, the following:

1. Sizing of automatic control valves and VAV boxes.

2. Sizing of automatic dampers.

3. Sizing of actuators for dampers and valves.

4. Calculations or curves for determination of flow of Airflow Measuring Devices (AMDs).

5.

Expansion Capability:

a. Installed spare inputs and outputs.

b.

Equipment needed for each increment of further expansion.

6.

Number of Remote Control Panels (RCPs) and their locations.

7.

Number of Field Equipment Panels (FEPs) and their locations.

8.

DDC system communication configuration, including interconnection of RCPs.

9.

Locations of different control loops and data (at CPU, RCP or FEP).

10.

Detailed interface with other manufacturers' systems (e.g., exhaust fans, auxiliary air handling units, fume hood high/low switches, etc.).

C.

Product Data - Submit product data, including manufacturer's descriptive and technical literature, performance charts and curves, and catalog cuts and installation instructions. For each product specified, show the specification page and paragraph number to which the product is related. Show clear indication of the system on which the product is to be used. FAILURE TO MEET THESE REQUIREMENTS SHALL BE GROUNDS FOR AUTOMATIC REJECTION WITHOUT REVIEW.

D.

Software Packages - Submit sample of software as it will be finally documented. Include system and command software, loop diagrams, application programs, graphic standards, point naming standard, and instructions for the insertion of new programs (or modifications of existing programs).

E.

Preliminary Equipment Test Plan and Test Procedures - Submit a test plan and test procedures for the preliminary equipment test. Explain and detail, step-by-step, the expected results for demonstrating the requirements of this specification, and the methods for simulating the necessary conditions of operation to demonstrate performance of the system. The test plan and test procedures shall demonstrate the capability of the system to monitor and control equipment, and to accomplish the control and monitoring functions described in the DDC System Sequences of Operation in Section 15950 using the field-equipment simulator. Notify the Contracting Officer of the date(s) of the test(s) four (4) weeks before testing starts.

F.

Operation and Maintenance Manuals - Submit manuals in accordance with Division 1.

G.

Record Drawings - Submit a complete set of record drawings at the time of system acceptance in accordance with Division 1.

H.

Service Contract - See Paragraph 3.05.

I.

Site Test Reports - See Paragraph 3.07.

1.05

QUALITY ASSURANCE

A.

Contractor's Qualifications - Acceptable Contractors shall meet the following qualifications:

1.

The Contractor shall have a minimum of three (3) years of demonstrated technical expertise and experience in the installation and maintenance of DDC Systems similar in size and complexity to this

Project.

2.

The Contractor shall have maintained a service organization consisting of at least three competent servicemen, within 50 miles or two hours of this Project, for a period of not less than three (3) years.

3.

The Contractor shall provide an experienced Project Manager for this work, including direct supervision of installation and startup of the system.

4.

The Contractor shall provide an experienced training staff to provide the training specified herein.

5.

The Contractor shall provide an experienced service staff to provide the service specified herein.

Acceptable DDC System Equipment Manufacturers - The following manufacturers are approved for use.

1. Andover Controls Corporation.

1.06

DESIGN AND PERFORMANCE CRITERIA

A.

General - The DDC System provided shall have a record of successful operation of not less than five (5) year on applications similar to this Project, and shall be specifically designed for HVAC applications.

Adaptation of equipment designed for other purposes will not be acceptable.

B.

System Accuracy - Provide a DDC System which shall maintain an end-to-end accuracy for one (1) year from sensor to final control devices (as monitored and controlled by the Central Operator's Console for the applications described below:

1.

Temperature of plus or minus 1.0 degrees F within a range of minus 30 to plus 140 degrees F or as required.

Relative humidity of plus or minus 5.0 percent RH with a range of 5 to 95 percent RH.

3.

Airflow with a range of plus or minus 5.0 percent of span.

4.

Pressure of plus or minus 5.0 percent of span with a range of minus 0.25" w.c. or plus 0.25" w.c.

Data Base Update - The Central Operator's Console point data base shall be updated so that any change in analog value or digital status is no older than ten (10) seconds.

D. Environmental Conditions

The Remote Control Panels (RCPs), Terminal Control Units (TCUs), Field Equipment Panels (FEPs) and other field equipment shall operate under ambient environmental conditions of 32 to 122 degrees F dry bulb and 10 to 95 percent relative humidity, noncondensing. Sensors and control elements shall operate under the ambient environmental temperature, pressure, humidity, and vibration conditions specified or normally encountered for the installed location.

Other equipment shall, unless designated otherwise, operate properly under ambient environmental conditions of 50 to 104 degrees F and a relative humidity of 20 to 80 percent RH.

E.

Power Line Surge Protection - Protect equipment power supplies from power line surges less than 20 microseconds to 1000 volts. Provide protection of equipment at ground potential to ensure protection against surges. Do not use fuses for surge protection.

F.

Communication Links Surge Protection - Protect communications equipment against surges of up to 1000 volts and 500 amps for 20 microseconds induced on any communications link. Cables and conductors which serve as communications links between Central Control Room Equipment and Remote Control Panels shall have surge protection circuits installed at each end. Do not use fuses for surge protection.

G.

Materials and Equipment - Where multiple units of the same type are required, the units shall be the products of a single manufacturer. However, the component parts of the system need not be the products of a single manufacturer. Each major component of equipment shall be labeled with the manufacturer's name, address, model and serial number, and the system symbol nametag.

H.

Control Power - Control power shall be 120 V ac. The Contractor shall bring 120 V AC service to each point as required.

PART 2 PRODUCTS

2.01

GENERAL DESCRIPTION

Furnish complete documentation as required under Division 1.

B.

The Direct Digital Control (DDC) System shall be based upon a system architecture of distributed microprocessors. Major system elements shall be Field Equipment Panels (FEPs), Terminal Control Units (TCUs), Remote Control Panels (RCPs) and Central Operator's Console. The RCPs shall be microprocessor-based controllers that accept both analog and digital inputs from field sensors (transmitters), perform the desired control algorithms, and provide both analog and digital outputs to the operating mechanical equipment. The Central Control Room Equipment and RCPs shall communicate through a common data highway. The FEPs shall contain slave input/output modules, transmitters, field devices and termination points. The RCPs shall be capable of stand-alone operation. In the event of failure of the CPU in the Central Operator's Console, the rest of the DDC System shall be capable of fully implementing all the programs described later in this Section. The ability of the DDC System to implement these programs under a failure condition of the CPU shall be documented by the supplier at Bid time.

C.

The DDC System shall have a high-level color graphic user interface, and shall have full and clear documentation and training so that the FAA may, when required, add to, subtract from, or otherwise alter any software program, graphic or report residing in the system.

2.02

FIELD EQUIPMENT

Remote Control Panels (RCPs)

RCPs shall be microcomputer based. Provide in each RCP a minimum of 15 percent of its I/O as installed spares. The type of I/O spares shall be in the same proportion as the implemented I/O on the RCP, but in no case shall there be less than two spare points of each I/O type. The RCP shall be furnished complete, with no changes or additions necessary to support implementation of spare points, and shall be so constructed and documented. Output relays associated with digital signals shall be considered part of the I/O point, whether physically mounted in the enclosure or separately mounted. Implementation of installed spare points shall necessitate only provision of the additional field sensor or field control, wiring, and connection to the system, point definition assignment by the operator, and control software. Construct the RCP so that all I/O points are implemented on replaceable circuit boards to permit field maintenance.

Provide each RCP with the following functions:

a.

Change-of-state, or change beyond a threshold value, high limit, low limit or out-of-range reporting.

b.

Polling of values of other RCPs or of setpoints in the Central

Operator's Console.

c.

Execution of all control functions and data recording.

d.

Peer-to-peer communication.

e.

Complete stand-alone operation in the event of loss of communication with the local area network (LAN).

Provide a sealed battery power backup for any volatile memory excluding external connected controls and sensor for a period of

24 hours. Provide circuitry to eliminate erratic operation due to low battery charge by sensing battery performance and executing an orderly shutdown before the electronic minimum operating point is reached. Provide automatic charging of batteries and operating alarm point indication that the RCP is operating under battery power.

4. Power-Failure Automatic Restart

During periods of inadequate power at a RCP or group of RCPs, the CPU shall initiate a system alarm annunciating which RCPs are "off-line" and that it is due to a power problem. The CPU shall continue to attempt to reestablish communication with any RCP that is off-line, with only Owner-specified subsequent printouts after the first report. An operator may at any time request the status of all RCPs to determine those, if any, which are off-line.

Immediately after restoration of power to a RCP, the CPU shall once again detect communication and begin the refreshing process. Changes in status or setpoints shall produce only normal, smooth control of the final system.

Provide confirmation on all digital output signals to ensure that final control devices receive the command instructions and respond as commanded by the operator or automatically by the system. Any system request not responding as commanded where feedback is avail able shall cause an alarm.

6.

The system shall utilize software comparison of last command and status from the field-proving device to report "abnormal on" as well as "abnormal off" conditions of controlled equipment.

7.

The loss of power to one RCP shall not affect transmission of data from any other panel.

8.

Each RCP shall detect whether any circuit card has been disconnected, failed, or removed and shall advise the Central Operator's Console of this condition, for an alarm printout.

9.

The data-collection hardware shall provide complete isolation on each input circuit and each output circuit to prevent noise and voltage surges from entering the logic circuits.

10.

Provide electrical end-of-line supervision of all inputs required.

11.

Provide locking-type cabinets with common-lock keys.

12.

Each RCP shall be provided with a power supply for 2-wire transmitters capable of handling all 2-wire transmitter inputs to a specific panel.

13.

Each RCP shall include a real-time clock with battery backup for 24 hours, and real-time software to permit initiation of control sequences according to time of day and time of year. Communication Link and/or Central Operator's Console failure shall not cause interruption of currently scheduled RCP functions.

14.

The RCPs shall control all functions as required.

15.

The RCPs shall provide a jack convenient to service personnel allowing a portable operator's terminal to gain full access to the local RCP and all other RCPs on the local area network.

16.

The RCPs shall operate from 120 V ac, 60 Hz sources. A 120 V ac, grounded service outlet for the use of test equipment shall be provided at each RCP so that power is always available, even if RCP circuit power has been turned off.

B.

Terminal Control Units (TCUs)

1.

TCUs shall be microprocessor-based, real-time digital control processors. TCUs shall operate as stand-alone controllers capable of performing their specified control responsibilities independently of other controllers in a peer-to-peer network.

TCUs shall have sufficient memory to support their own operating system and database. TCUs shall have an integral airflow (differential pressure) transducer and be capable of full PID control.

Operating interface with any TCU program or point data shall be through the Central Operator's Console or Portable Operator's

Terminal connected to the Local Area Network (LAN).

Each TCU shall be programmable via a plug-in jack at the TCU using a portable operator's terminal. Programming of the TCU shall also be accomplished from the RCP via the LAN using a portable operator's terminal.

Any programmable parameters (setpoints, algorithms) shall be stored in protective memory such that a power failure of less than ten (10) days shall not require reprogramming of the controller.

6.

Failure of any TCU shall be reported to the Central Operator's

Console.

7.

Each TCU shall have the capacity to accept at least two (2) analog or digital input signals, and provide at least one (1) analog and one (1) digital output signal as required to properly control the application.

8.

Each TCU shall be powered from 24 V ac. As an option, the TCU may be equipped with a stepdown transformer (120/24 V ac).

9.

Each TCU shall be the DDC System manufacturer's standard product.

Input/Output (I/O) Functions

Analog Inputs (AI) - The AI function shall monitor each analog input, perform at least 10-bit analog-to-digital (A-to-D) conversion every second, and hold the value in a buffer for interrogation. Provide signal conditioning for each analog input. Individually calibrate all analog inputs for zero and span, in hardware or in software. Provide adequate noise rejection to provide stable, accurate readings and control. Provide power supply and signal conditioning for all transmitters.

2.

Analog Outputs (AO) - The AO function shall perform at least 8-bit digital-to-analog (D-to-A) conversion every second, and output a signal within the range of 0 to 20 V dc or 0 to 20 mA dc. Individually calibrate all analog outputs for zero and span in hardware or software. Provide short-circuit protection.

3.

Digital Inputs (DI) - The DI function shall accept on-off, open-close or other two-state data indications. Provide isolation and protection against input voltage surges up to 180 V ac peak. Both dry contact inputs and 0 to 20 V dc input sensing shall be pro vided.

4.

Digital Outputs (DO) - The DO function shall provide contact closures for momentary and maintained operation of field devices. Momentary closures shall have a minimum duration of 0.1 second. Provide electro-magnetic interference suppression on all output lines, to limit transients to non-damaging levels. Provide isolation and protection against voltage surges up to 180 V ac peak. The output closures shall be rated 120 V ac and 5 amps for non-inductive loads. In the event that the Remote Control Panel output contacts do not meet these requirements, interposing relays shall be provided in the Field Equipment Panel to accommodate requirements of field equipment.

D. Field Equipment Panels (FEPs)

The Field Equipment Panels shall contain all required Pressure-to-Current (P/I) transducers, solenoid valves (EP), Current-to-Pressure (I/P) transducers, manual switches, pressure regulators, all required pressure gauges for pneumatic inputs and outputs, and all interposing relays.

The FEPs shall operate from 120 V ac, 60 Hz sources.

RCPs may be contained in FEPs.

4.

FEPs may contain slave input/output points to a controlling RCP.

5.

Field Enclosures - Provide steel enclosures with factory-applied enamel finish. Enclosures shall have at least a NEMA 1 rating.

6.

Nameplates - Provide laminated plastic nameplates for all equipment. Plastic shall be 1/8-inch thick, white with black center core. Nameplates shall be a minimum of 1 inch by 3 inches, with minimum 1/4-inch high engraved alphanumeric black characters on a white field.

7.

Bulkheads - Provide bulkheads for any tubing connections.

8.

Wiring Terminations - Provide terminal blocks with clear labels for all field wiring.

E.

Field Equipment - Refer to Section 15910, Instrumentation and Control Equipment.

2.05

DATA AND ALARM TYPES

A.

Points - Points are all system inputs, outputs, and their direct math or program conditioned values. Each point may have several conditioned system values, such as an outdoor temperature and relative humidity combination being also available as a computed dew point, wet bulb, enthalpy and grains of moisture points.

B.

Variables - Variables include all system points plus all internal values, such as time, free memory, scan time, internal diagnostic values, historic logged values, etc.

C.

Setpoints - A setpoint is a database value that is adjustable by an operator at the appropriate system access level. The setpoint shall be adjustable by clicking on the value on the Central Operator's Console (COC). Maximum and minimum values for each setpoint can be established by a programming access level operator. Any change of a setpoint shall cause an entry in the COC database auditing the new value, the old value, the time of change and the logged-on operator.

D.

Targets - Targets are computed values based on a reset schedule or other formulated value. Targets may be relatively simple, such as day and night setback or they may be based on many factors, such as an air handling unit's cold-deck target. Targets are adjustable by the operator only indirectly by changing setpoints or program code that the reset schedules are based on.

E.

Point Out-of-Range Alarms - A point out-of-range alarm are initiated when the raw value of the input is above or below the ceiling or floor of the sensor. For instance, a 4 to 20 mA signal shall have an out-of-range alarm when the value is above 20 mA or below 4 mA. This alarm condition shall have setpoint maximum and minimum and setpoint time delay. The alarm condition shall be treated at a different alarm level than an analog alarm and may be used in a program to initiate the loss of sensor application logic. Pulse accumulator or rate inputs shall be alarmed as point out-of-range if the pulse rate is higher or lower than allowable.

F.

Analog Alarms - Maximum or minimum analog alarms are initiated when an alarmed point is higher or lower than a value setpoint for longer than a time setpoint. Deviation alarms are initiated when an alarmed point is further away from a target or setpoint by the alarm deviation setpoint for a period longer than a time setpoint. Analog point readings shall be reviewed against their respective alarm limits every second. Each analog alarm limit shall have an associated return-to-normal limit differential setpoint and time setpoint specifying the length of time and the amount by which the alarmed point must return into the normal range before being annunciated as a return-to-normal event. Each alarm shall have a setpoint representing the amount of time that the point can be taken out of service or silenced (0.0 to 48 hours) or, if set to 99, the alarm shall remain out of service. When out of service, the point shall still be listed when the operator requests the current alarm summary report. A command shall allow all alarms to be put back in service or all taken out of service.

G.

Digital Alarms - A digital point shall be alarmed when it goes to the alarmed state for the setpoint duration. All out-of-service and return- to-normal features of an analog alarm shall be available.

H.

Output Constraints - Each output shall have constraints defined by the controlled equipment or device manufacturer or as otherwise required and entered by the Contractor, including the following as applicable:

Maximum starts (cycles) per hour or per day or per required period.

2. Minimum off-time.

3. Minimum on-time.

High-limit value.

Low-limit value.

6.

Software reasonableness tests that will stop unwanted rates of change or output states.

I.

Diagnostic Values - Each DDC system panel shall have self-test diagnostic routines implemented in firmware. The tests shall include routines that exercise memory. The routines shall cause a panel alarm that shall display messages in clear phrases to inform the operator of diagnosed problems. These diagnostics shall be quantified into diagnostic values as system variables for control programs. Programs in that panel or in other panels can use the alarm points to initiate alarm sequences.

2.06

CONTROL TYPES

A.

PID Control - The system shall provide one or more PID control algorithms that will provide accurate analog output control that will allow the process variable to be controlled to a target. The "process time constant" is defined as the time that it takes the process variable to change from its minimum value to within 90 percent of its maximum value after the control is changed from minimum to maximum. The "process span" is defined as the span between the minimum process variable and the maximum process variable. The PID control shall provide less than 10 percent overshoot and a settling time to within 1 percent of the target within four (4) process time constants or as more strictly required. If only PI control is appropriate for the application, then it can be used instead of PID control.

B.

Two-Position Control - This function shall control the output to two (2) states by comparing a setpoint or other algorithm against a target and against an established deadband, and selecting the state. Minimum on and off times and maximum starts or changes of state during a period and/or states of other outputs may be part of the algorithm.

C.

Floating-Point Control - This function shall cause an open or close output (or other output pair) to actuate when a proportional plus integral error signal exceeds a selected deadband. The output will have a duration determined by an algorithm that will provide control to an analog setpoint of the same quality as the PID control method.

D.

Time-Proportional Control - This type of control shall allow a digital output to cycle its load on and off for a portion of a selected base period to effect a level analog control with a single digital output. Particular attention shall be paid to the controlled device manufacturer's recommended equipment constraints.

2.07

ALARM LEVELS

A.

General - The following alarm levels and their functions shall be programmed into the system. The setpoints that trigger the alarms shall be adjustable on the graphic alarm summaries by an operator at the proper level. This high-level operator shall also be able to silence a specific alarm for a fixed time interval or take it out of service. All alarms that are out of service shall be listed on an alarm out-of-service report. Any other alarm level shall be created and/or any of these existing levels modified as required by the Owner for the first year of operation. There shall be an "all silence" command. Alarms shall be cascaded such that, if a high-level alarm is received, all other related subsequent alarms shall be squelched to prevent alarm overloading. For example, when a building power failure is received, the fan proof-of-run alarms shall be squelched until the power returns to normal. If a fan proof-of-run is alarmed, the static pressure and flow alarms and associated room condition alarms shall be squelched.

B.

Safety Level Alarm - A safety level alarm shall result from automatic safety actions, such as high static fan shutdown. The Central Operator's Console (COC) shall be alarmed by an on-screen message, safety level CPU beeping pattern, (3 one-second beeps), and a message printed on the alarm printer and logged to the alarm disk file detailing action and causes of the alarm. This safety level alarm requires operator acknowledgment and will repeat the alarm message on screen every 15 minutes if not acknowledged. A safety level alarm shall close a safety level alarm contact for remote annunciation. Acknowledgment time, current values and operator's name shall be logged to the alarm printer and the disk; the acknowledgment requests are not logged. Return to normal shall be displayed, printed and logged.

C.

High Level Alarm - A high level alarm shall have all safety level alarm functions except the following. The high level beep (three 1/4-second beeps) is used. A high level alarm shall close a high level alarm contact for remote annunciation. (not used)

D.

Operator Level Alarm - The alarm is displayed on the COC, printed and logged as in high level but acknowledgment is requested once and not repeated until 8 AM the next day. The operator level beep (one short beep) is used. Return to normal shall be displayed, printed and logged.

E.

Maintenance Level Alarm or Reminder - The message is displayed on the COC and logged to a maintenance alarm file but is not printed to the alarm printer. No acknowledgment is requested and no return to normal is displayed, printed or logged.

2.08

STANDARD FUNCTIONS

Scheduled Control - This function shall operate zones or equipment with a two-state (occupied/unoccupied state) based on a time-of-day schedule for each day of the week and on a holiday schedule. Up to four (4) occupied- unoccupied times can be set per day in a schedule. Up to 28 special events to occupy the area can be scheduled. Up to 28 holiday events can be scheduled. Events and holidays can be scheduled for up to 20 years in the future and can be from one (1) hour to thirty-one (31) days in length. To eliminate power surges, an operator-adjustable time delay shall be provided between consecutive occupancy times so that an operator can schedule all zones or equipment to become occupied at the same time without any adverse affects on the building's power system or utility demand charges.

Program Inputs

Time of day, day of week, day of month, month, and year.

Cooling and heating mode and start/stop schedules.

Equipment status and constraints.

Program Outputs

Start/stop signal.

B.

Optimum Start/Stop Control - This function shall modify the scheduled control program to include a sliding schedule based on indoor and outdoor air conditions. The program shall take into account the thermal characteristics of the structure, and indoor and outdoor air conditions using prediction software to determine the minimum time of HVAC system operation needed to satisfy space environmental requirements at the start of the occupied cycle, and determine the earliest time for stopping equipment at the day's end without exceeding space environmental requirements. The functions shall be self-learning based on the most similar historic day's heating or cooling startup results. The self- learning function shall be able to be disabled by the operator or fixed at a good operating level. The self-learned values shall be recorded during a program dump and reload to restore the previous operating level. The self-learning function shall be based on each piece of equipment being optimally scheduled and not a building-wide average.

Cooling or heating mode of operation.

Equipment status.

Cooling and heating building occupancy schedules.

Required space temperature at occupancy.

f.

Space temperature(s).

g.

Building heating and cooling constants (both are operator-fixable, adjustable or self-learning).

h.

Outside air (OA) temperature.

i.

Equipment constraints.

j.

Cooling and heating high-low alarm limits.

Occupied-Unoccupied Setback Control - This function shall limit the rise or drop of space temperature (or specified variable) during occupied hours. Whenever the space temperature (or specified variable) exceeds the operator-assigned limit, the system shall be cycled on until the variable is within the assigned limit in a method that respects all the controlled equipment manufacturer's recommended equipment constraints.

Cooling or heating mode of operation.

Cooling and heating occupancy schedules.

Equipment status.

e.

pace temperature (or specified fluid temperature)

Minimum and maximum setpoints during unoccupied periods.

Equipment constraints.

D.

Signal Selection Function - This function shall allow the selection of the highest or lowest or average or other weighted or statistical function to compute one analog value that represents a selected group of analog values as the basis of control. The function shall include the ability to review large numbers of inputs that can be reduced to one or two variables. Signal selection shall also provide the number of signals above or below the setpoint or target.

Selected variables.

Analog variable.

PART 3 EXECUTION

3.01

GENERAL REQUIREMENTS

Installation - Install all system components and appurtenances in accordance with the manufacturer's recommendations and as required. Provide all necessary interconnections, services, and adjustments required for a complete operable system. Install electrical devices, sensor wiring, control wiring, data communication links and conduit as required.

Provide all relays and/or additional devices as required for the interlocking of equipment.

Provide all pneumatic control tubing and electrical wiring as required for proper system operation.

If a field device requires 120 V ac service and is to be mounted at a different location from the 120 V ac power source. provide extensions to the power wiring, including conduit, junction boxes and other required hardware as required. This requirement shall also apply to devices powered by 24 V ac.

4.

Verify exact quantity and size of tubing and wiring for all systems.

5.

Provide all electrical work in accordance with Division 16 of the Specifications.

6.

If there is any doubt as to the validity of control and/or interlock wiring, verify to the Contracting Officer that field wiring has been done and has been properly connected to the appropriate device(s) as required.

7.

If the DDC System Contractor places the RCPs and FEPs at locations different from those shown on the drawings, the DDC System Contractor shall extend power wiring and all other wiring to the new locations and make all necessary connections required at the new locations.

Housing - All equipment installed outdoors shall be housed in a NEMA 4 enclosure, unless otherwise shown. All other enclosures shall be at least NEMA 1 type unless otherwise shown.

Mounting of Panels

Each Remote Control Panel (RCP) shall have associated with it a Field Equipment Panel (FEP) for mounting and connection of field interface devices. Each FEP shall be mounted directly adjacent to its respective RCP. RCPs and FEPs can be combined into one cabinet. RCPs with multiple FEPs shall be located as required. All RCPs and FEPs shall be mounted such that the panel doors open outward from the center between the two panels.

All RCPs and FEPs shall be installed so that they are stable and fully supported throughout the entire panel, minimum one inch from the wall. Panels mounted on air system housings or ducts are not acceptable. Ensure that panels are free from obstructions to allow for ease of operation and maintenance.

3.02 FIELD EQUIPMENT - Refer to Section 15910, Instrumentation and Control Equipment.

3.03 SOFTWARE - Load and debug all software required for an operational DDC System, including data base, operational parameters, and system, control and application programs.

3.04

SIGNAL TRANSMISSION

A.

Cable Runs - Keep cable runs as short as possible, allowing extra length for connecting to terminal boards. Use sleeves or grommets to protect cables from vibration at points where they pass around sharp corners or through penetrations.

B.

Grounding - Grounding shall be in accordance with ANSI C2. All ground wire shall be copper. All signal wiring, including communication links and sensor wiring, shall be grounded at only one point for the entire system. Sensor wiring ground wires shall be terminated at the RCP and connected to the communication link ground wire. All communication link ground wires shall be terminated and grounded at the DDC system ground.

3.05

MAINTENANCE AND SERVICE

A.

General Requirements - Provide all services, materials, and equipment necessary for the successful operation of the entire system and all appurtenances for a period of one (1) year after acceptance by the Government. System acceptance shall be defined as full completion of all testing and performance verified by the Contracting Officer and sign-off of acceptance.

B.

Emergency Service - The Supplier/Installer shall have a technical representative capable of servicing the equipment at the job site before the end of the working day when the service call is made prior to 12 o'clock noon. The Supplier/Installer shall have a technical representative capable of servicing the equipment at the job site before 12 o'clock noon of the next working day when the service call is made after 12 o'clock noon or during the evening or weekend.

C.

Personnel - Advise the Contracting Officer in writing of the names of the designated service representative(s) and service personnel. Update this list when there are changes in personnel.

1.

Supervision - During maintenance and service, provide a full-time supervisor with full authority to act for the Supplier/Installer. The supervisor shall effect daily liaison during the normal working hours with the Government.

2.

Service Personnel - Provide qualified service personnel to adjust and repair the system.

D.

Service Contract - Submit, at the time of initial bid proposal, a one-year extended service contract proposal, which may be accepted by the Government up to the end of the first-year warranty period.

3.06

TESTING AND SYSTEM ACCEPTANCE

Preliminary Equipment Test

1.

General - Prior to shipment of any RCPs or Central Control Room Equipment, partially assemble the DDC System with at least two (2) RCPs and one (1) complete central operator's console, and demonstrate that the performance of the system satisfies the requirements of these specifications. This test shall be based on the previously supplied and approved preliminary equipment test plan. The equipment used shall be the actual equipment to be shipped to the job site. Upon successful completion and approval of the preliminary equipment test by the Government, the partial DDC System equipment and RCPs may be shipped to the job site and installed. The test shall include the following:

a.

Operator interactions with the previously submitted and approved operator color graphic user interface, including all the specific job graphics.

b.

Demonstration of a RCP's digital on-off sequence and a PID loop program. Use actual RCP outputs and inputs with simulated field equipment (relays, lights, switches, temperature probes, 4 to 20 mA signal source, etc.). Program coding and editing shall be demonstrated. Actual programs with previously approved tag names developed for this project shall be used.

Demonstration of reports and access methods. System points shall be hooked up for reporting.

Demonstration of override control of RCP outputs.

Demonstration of alarm reporting, acknowledgement, and alarm database management.

Demonstration of a RCP failure and changeout with a replacement.

Demonstrate alarms reported, system status of inputs and out puts, physical replacement of RCP's electronics, and reload and restart of the RCP.

System Timing - Demonstrate and measure the time that it takes between the following actions and events. Programming representative of this job shall be used.

1) Operator changes an on-screen graphic setpoint.

2) Setpoint change triggers an RCU's output to go on.

3) RCUs output is hard wired into an input simulating equipment feedback. Inputs value changes from OFF to ON in operator graphic.

4) Input is communicated to another RCU over the communication bus and causes an output to change on that RCU.

5) Operator graphic updates with new state of RCU output.

Site Test

General - Prior to contacting the Contracting Officer for startup testing, the DDC System Contractor shall verify that the performance of the system satisfies the requirements of these specifications.

The DDC System Contractor shall make all required changes to conform to these specifications. Upon the successful completion of these requirements, the DDC System Contractor may proceed to notify the Contracting Officer for final testing and punchout. The site preliminary DDC system test shall include the following:

At least one (1) operator's console, including its printers, disks, and software, is functional.

Completed communication with each RCP.

Operational Portable Operator's Terminal.

Complete and installed surge protection equipment for power lines and data communication links.

System Checks - Notify the Contracting Officer, and demonstrate all computer and peripheral operations. System checks shall include the following:

Operator's Console Program Backup and Program Load Operation.

Operator's Console Startup and Diagnostics.

Operator's Console DDC System Communication Status.

Operator's Console Automatic Restart After Power Failure.

Alarm Display and Alarm Database Management.

Logs and Report Storage, Retrieval and Printing Functions.

g. All DDC System RCP Software.

h. RCP I/O Functions, Including Real-Time Control.

i. RCP Normal Startup.

j. RCP Failure Modes and Diagnostics.

k. RCP Auto Restart and Reload (EPROM and PROM).

3.

System Timing Tests - Demonstrate end-to-end system timing. This test shall demonstrate display update times, database update times and RCP control times from an operator's console input to final display of the RCP's feedback signal. Include normal heavy-load conditions and any abnormal conditions.

C.

Point Test

1.

Generate a hardcopy form of all system points and use the form for testing of each point. Submit complete form to the Contracting Officer no later than ten (10) days prior to the Point Test. Schedule the tests at the convenience of the Government to allow Government witnessing of tests. Tests shall include actual field verification of input value or output state and the head-end system readout of the same data. Record the head-end value, the field- verified value, and the date and time of the test. Each completed form shall be initialed by the Contractor's technician responsible for the testing. Any deviations of field versus head-end readings in excess of the required tolerances shall be corrected and retested prior to acceptance of the Point Test. Submit a complete copy of all Point Test results to the Contracting Officer for review prior to the Functional Test.

D. Functional Test

1.

Schedule functional test at the convenience of the Government to allow for Government witnessing of tests. Using a copy of the Sequence of Operation for each system, verify that each required sequence is completed. The Contractor shall record results on the copy with margin notes or attached notes, charts or tables, and shall sign and date the copy. The Contractor can simulate inputs or outputs via the operator's console or by applying a signal to the appropriate input or output terminals if real-time conditions do not allow complete testing. The system clock may be temporarily changed to simulate event times. All alarm reporting and data functions shall be tested. Submit a complete copy of all Functional Test results to the Contracting Officer for review prior to System Turnover.

E. System Turnover

1.

After the Government accepts that adequate operator training has been successfully completed to allow operation of the system, and after Point Testing and Functional Testing are completed, and on a schedule set for the convenience of the Government, the Contractor shall bring the system on-line and turn the operation over to the Government. The Contractor shall assist the Government's operators in smooth and efficient operation. The Contractor shall provide a bound log at each of the operator terminals suitable for logging all DDC system failures, operator questions and suggested changes or improvements. The Contractor shall assist in the system turnover for thirty (30) days. If more than 10 percent of the system goes out of service, the system turnover time shall restart for another thirty (30) day period from when the system returns to 100 percent on-line.

If agreed upon by the Contracting Officer, a schedule of section or system turnovers will be established allowing a smooth transition and startup of the DDC system. All testing and reporting shall be done to allow partial acceptance of each section or system.

F.

Acceptance

1.

The DDC system will be accepted after the Contracting Officer reviews thirty (30) days of operating logs and accepts corrections to any system deficiencies for all parts of the DDC system. The Contracting Officer will then set the acceptance date that will start the one-year warranty of the system. Partial acceptance shall not start warranty on that portion of the Contract.

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