3364_S_15570_9-08-2016.pdf

AFRL, Repair Air Handlers, Bldg 3 AUTOMATIC TEMPERATURE CONTROLS TE Project #3364 SECTION 15570- 1

SECTION 15570

AUTOMATIC TEMPERATURE CONTROLS

PART 1 – GENERAL

1.01 REQUIREMENTS

A. Furnish and install complete automatic temperature control systems as shown on the drawings and herein specified.

B. System shall be the distributed-processing, direct digital control (DDC), type;

compatible for networking with the Owner’s existing single point programming and information sharing building management system (BMS); CAPABLE OF MULTI-SITE

INTERFACE VIA PASSWORD SECURED INTERNET, OWNER NETWORK AND

TELEPHONE MODEM ACCESS; complete with programmable control modules, specific function control modules, software, portable editing device (laptop computer), dampers, valves, actuators, sensors, ancillary controllers, relays, switches, start-up service and all necessary accessories required to accomplish the sequences herein specified; additionally, system shall be a seamless extension of the existing with the capability to provide:

1. Communication with the existing Application and Data Servers, Operator

Workstations, and Portable Operator Terminals.

2. Controller programming and upload/download functions for new and existing controllers.

3. Database archiving.

4. User Access/Operator Interface including graphic displays.

5. System software features including:

a. Adjustment and override of system parameters.

b. Scheduling and reporting functions.

c. Historical trending and data collection.

d. Alarm annunciation including paging and e-mail notification.

e. Peer-to-peer communications between new and existing controllers.

C. FAILURE TO COMPLY WITH THE ABOVE REQUIRES THE COMPLETE REPLACEMENT

OF THE EXISTING SYSTEM (DUAL OR HYBRID/INTEGRATED SYSTEMS ARE NOT

ACCEPTABLE).

D. The scope of work includes all systems/equipment/terminals shown on the drawings (both existing to remain and new) in context with the sequences hereinafter described.

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E. PROVIDE ON-SITE TECHNICAL ASSISTANCE AS REQUESTED DURING TESTING

AND BALANCING.

F. Existing controlled devices and their associated actuators may be reused unless they are unsatisfactory for continued service; in which case, they shall be repaired or replaced as appropriate.

1.02 SUBMITTALS

A. ALL REFERENCES TO EQUIPMENT, CONTROLLERS, CONTROLLED DEVICES, ETC.

SHALL MATCH EXACTLY THE TITLES AND ALPHANUMERIC DESIGNATIONS

SHOWN IN THE BIDDING DOCUMENTS.

B. THE SEQUENCES OF OPERATION (EXCEPT FOR THE INSERTION OF REFERENCES

TO SPECIFIC DEVICES) SHALL MATCH PRECISELY THE VERNACULAR OF THIS

SPECIFICATION; UPON REQUEST, THE ENGINEER WILL PROVIDE DIGITAL FILES.

C. THE SYSTEMS SCHEMATICS CONFIGURATION SHALL MATCH EXACTLY THOSE

SHOWN IN THE BIDDING DOCUMENTS; UPON REQUEST, THE ENGINEER WILL

PROVIDE DIGITAL FILES.

D. The SYSTEMS GRAPHICS SHALL MATCH EXACTLY THOSE SHOWN ON THE

BIDDING DOCUMENTS AND SHALL BE INCLUDED AS A DESIGNATED PART OF THE

SUBMITTAL IN ELECTRONIC FORMAT; UPON REQUEST, THE ENGINEER WILL

PROVIDE DIGITAL FILES.

1.03 GUARANTEE

A. The system shall be guaranteed to be free from defects in materials and workmanship for a period of 2 years from the date of final acceptance by the

Owner, during which time all above mentioned defects shall be corrected and all services incidental to proper performance shall be provided free of charge.

1.04 START-UP

A. System start-up shall include the provision of initial programming, setting, testing and checking and all subsequent programming modifications and adjustments required to insure proper operation.

B. Seasonal related influences for heating and cooling shall be appropriately phased.

1.05 INSTRUCTIONS

A. Instructions for system operation (as required and/or requested throughout the guarantee period by the Owner’s authorized representative) shall consist of 3, 4-hour sessions requiring written acknowledgement (refer to “Owner Instruction

Log”, attached).

PART 2 – PRODUCTS

2.01 ACCEPTABLE SUBCONTRACTORS

A. Johnson Controls or approved equal.

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2.02 DESCRIPTION

1) Master station hardware:

1. Central processing unit (CPU):

a. Microprocessor:

1) Pentium 4, running at 2.5GHz.

b. Memory:

1) Random access (RAM):

a) 1 GB SD.

2) Storage (read/write):

a) 60GB SCSI hard disk drive (7.5 MS access, 512K cache), controller.

b) 1.44KB, 3.5” floppy disk drive.

3) Read only (ROM):

a) 32X CD-ROM drive.

c. Communication ports:

1) 10/100/1000 ethernet adapter.

2) 1 parallel.

3) 4 USB.

d. Graphics Adapter:

1) 1024 x 768 pixel resolution.

2) 16 bit color quality.

e. Integral time clock.

f. Compaq, Dell, Gateway, IBM.

2. Peripheral hardware:

a. Monitor:

1) Two, 21 inch LCD flat panel display.

2) 1900 x 1280 pixel resolution, maximum.

b. Input devices:

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1) Enhanced 104 key keyboard, USB compatible.

2) Optical mouse.

c. Printer:

1) Laserjet.

2) 600 x 600 DPI resolution.

3) 12 PPM, black; 10 PPM, color.

d. Telephone modem:

1) 56K bps, USB compatible.

2) Programmable control modules (PCM):

1. General:

a. Stand-alone, microprocessor based.

b. Modular (allowing point expansion).

c. Direct digital control (DDC) algorithms (2-position, incremental, proportional, proportional plus integral, proportional plus integral plus derivative) programmed in a fashion properly complementary with the sequences herein specified.

d. Field programmable (local or from master station).

2. Input:

a. Analog:

1) 12 bit resolution, common sensing device(s) compatible.

b. Binary:

1) Supervised, common sensing device(s) compatible.

3. Output:

a. Analog:

1) 0 to 10 VDC or 4 to 20 milliamperes.

2) Designated (individual) for each controlled device.

b. Binary:

1) Continuous low voltage signal, normally open or normally closed, 3-position manual override (“On/Off/Auto”) as required.

4. Alarms (audio and visual; local and master station annunciation):

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a. Program failure.

b. Card failure.

c. Sensor failure.

d. Other (as herein specified).

5. Power loss protection:

a. Battery backup (RAM), 24 hours.

b. Automatic diagnostic resumption (prior to battery failure) following commercial power restoration.

c. Manual restoration (subsequent to battery failure) from mass storage.

6. Integral (local) display:

a. Monitored points.

b. Alarms.

7. Enclosure:

a. Steel, Underwriters Laboratories listed; key lock, piano hinged, full access door; baked enamel finish.

b. Arranged to permit timely (construction phased), internal termination of all associated wiring.

3) Specific function control modules (SFCM):

1. Units shall conform with the parameters outlined for programmable control modules, except that the memory shall be permanent and unaffected by loss of commercial power.

2. Units shall be employed as designated (never as a substitute for PCM’s).

4) Master station software:

1. Anti-recycle protection:

a. Designated programmable timers (0 to 120 minutes).

2. User access:

a. Multiple level, password secured; recorded log “On”/log “Off”.

b. Prompted, menu driven, English language communication; contiguous, help key actuated, instruction display.

c. Configuration software replete.

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3. Time-of-day scheduling:

a. Individually editable 8-day (7 plus holiday; 6 events per day) master schedules.

4. Features:

a. Custom control language, optimum start/stop, after hours override, run time and maintenance messages.

5. Operator interface:

a. Graphic displays:

1) Subcontractor created, dynamic, time dominion relevant, point data (descriptors, values and/or symbols).

2) ALPHANUMERICAL DESIGNATIONS (EQUIPMENT, CONTROLLERS,

CONTROLLED DEVICES, ETC.) AND GRAPHICAL CONFIGURATIONS

MATCHING BIDDING DOCUMENTS TERMINOLOGY AND

SCHEMATICS; UPON REQUEST, THE ENGINEER WILL PROVIDE

DIGITAL FILES.

3) Operator controlled (using mouse and/or function keys in conjunction with pop-up menu windows), sequential link, multiple access, manual point override, remote panel programming access

(via single keystroke).

4) Alarm notification (specific, removable pop-up message windows;

permanent, alarm pending message display).

5) CRT blank (subject to designated duration of non-use), automatic restoration (subject to audible alarm or keyboard use).

6) CURRENT DISPLAY (SUPERIMPOSED UPON PROPERLY

CONFIGURED SCHEMATICS) OF ALL SPECIFIED MONITORING AND

ALARMS.

b. User editing:

1) Prompted, fill-in-the-blank format.

6. Telephone operation:

a. Downloading and storage of templated applications programs (for remote panel use).

b. After hours alarm processing via auto-answer modem at user designated alternate location.

7. Trend log(s):

a. General:

1) Capacity to address all inputs, outputs and calculated values.

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2) Retrievable in file format or graphical display.

b. Initial requirements:

1) Thermal demand:

a) CHW systems.

b) HW heating systems.

2) Thermal energy consumed:

a) CHW systems.

b) HW heating systems.

3) Electrical demand:

a) CHW generators.

b) CHW system ancillaries.

c) Service entrance.

4) Electrical energy consumed:

a) Central station air handling system(s) fans.

b) CHW generators.

c) CHW system ancillaries.

d) Service entrance.

5) Portable editing device (laptop computer):

a. Operator terminal (briefcase size), battery powered, full alphanumeric keypad, disk storage.

b. Storage, data download and local display (monitoring and alarm) capacity.

c. Remote interface capacity for point of use programming and commissioning of field level controllers.

d. Operating system: Windows 7 Professional 64 bit.

2. Central processing unit (CPU):

a. Microprocessor:

1) Intel Core Processor i3 (2.3 GHz, 2MB Cache, 667 MHz).

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b. Memory:

1) Random access (RAM):

a) 4 GB, DDR3.

2) Storage (read/write):

a) 320GB SATA hard disk drive (5400 RPM, 300 MBPS), controller.

b) 32X CD-RW/DVD.

c. Communication ports:

1) 10/100/1000 PCMCIA ethernet adapter.

2) 2 USB.

3. Display:

a. 17.3” widescreen LED backlit..

4. WiFi wireless networking.:

a. 802.11 b/g/n.

5. Acceptable manufacturers:

a. Compaq, Dell, Toshiba, IBM.

6) Diagnostics:

1. Basic operation:

a. Self-testing; automatic storage; user notification via printer, audible tone and flashing display.

2. Troubleshooting guides:

a. Symptom/diagnosis displays (for master station, PCM’s and SFCM’s).

7) Automatic dampers:

1. Low leakage type (parallel blade for mixing service and opposed blade for volume/throttling service).

2. 16 gauge galvanized steel roll-formed blades, 13 gauge galvanized steel roll-formed frame, zinc plated hardware, interlocking blade edges with inflatable closed cell neoprene seal, friction type spring-loaded stainless steel blade ends with zero clearance.

3. Spring return (unless physical limitations are incompatible).

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8) Automatic control valves:

a. Complementary with all parameters (temperature, pressure, medium, etc.) related to the associated piping system.

b. Spring return (unless physical limitations are incompatible).

2. Steam, 2-way, proportional:

a. Globe pattern, single-seated, modified linear characteristics (unless otherwise noted or specified), renewable trim.

b. Adjustable start point and operating range as required.

3. Hydronic, 2-way, proportional:

a. Ball pattern, 2 inches and smaller; globe pattern, 2 ½ inches and larger.

b. Single-seated, equal percentage characteristics (unless otherwise noted or specified), renewable trim.

c. Adjustable start point and operating range as required.

4. Hydronic, 3-way, mixing/bypass, proportional:

a. Globe pattern, constant total flow characteristics, renewable trim, adjustable start point and operating range as required.

b. Configuration (NO, NC, C) as shown.

I. Actuators:

1. Linkage, cams, stroke, timing, torque, etc. complementary with the needs of the associated controlled device.

2. Controlled device (damper, valve) position monitoring (except units serving heating and/or cooling terminals) shall be ‘feedback’ via their associated actuator(s).

J. Sensors:

a. Appropriate range.

b. Suitable for service in accordance with the associated medium and ambient conditions.

2. Temperature:

1) Resistance temperature device (RTD), thermistor.

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2) Performance parameters:

a) Accuracy: ± 0.10% FS.

b) Non-linearity: ± 0.10% FS.

b. Space:

1) General:

a) Location coordinated with other elements contributing to the function and aesthetics of the associated wall elevation.

2) Attributes (as shown and/or noted on the drawings):

a) Adjustable (remote).

b) Indicating (liquid crystal display).

c. Immersion/insertion:

1) Well, easily removable probe.

2) Weather resistant housing as required.

3. Humidity:

1) Resistance bulk polymer.

2) Zero and span potentiometers.

b. Performance parameters:

1) Accuracy: ± 2.0% (20% rh to 95% rh).

4. Pressure:

1) Capacitance type.

2) Thermal coefficient matched components, temperature compensated.

b. Gases:

1) Stainless steel diaphragm, insulated stainless steel electrode.

2) Performance parameters:

a) Accuracy: ± 1.0% FS.

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b) Non-linearity: ± 1.0% FS.

c) Hysteresis: 0.10% FS.

d) Non-repeatability: 0.05% FS.

c. Liquids:

1) Stainless steel components, elastomer seals.

2) 3-valve manifold assembly, bleed ports.

3) Performance parameters:

a) Accuracy: ± 0.25% FS.

b) Non-linearity: ± 0.20% FS.

c) Hysteresis: 0.10% FS.

d) Non-repeatability: 0.05% FS.

5. Hydronic flowrate:

1) Microprocessor based, electromagnetic induction type.

2) NEMA 6 enclosure, self-monitoring, PROM memory, galvanic isolation.

3) Liquid crystal display.

4) Remote transmitter mounting.

b. Features:

1) Flowrate.

2) Totalizers.

3) Low flow cutoff.

4) Flow direction.

c. Performance parameters.

1) Accuracy: ± 0.5% FS.

2) Repeatability: 0.1% FS.

K. Water leak detection:

1. Isolated dry contacts.

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2. Building management system compatible.

L. Water meters:

1. Sealed register, magnetic drive.

2. Center sweep hand dial, leak indicator, dome glass lens.

3. Impulse contactor, building management system interface compatible.

M. Low limit thermostats (serving hydronic and/or steam coils):

1. Appropriate set point range, 120 volt, adjustable sensitivity (2F, minimum), manual reset, connecting capillary tube (20 feet long, minimum).

2. Capable of responding to the lowest temperature sensed by any one foot portion.

PART 3 – EXECUTION

3.01 INSTALLATION

A. Electrical wiring:

1. Wiring required to accomplish the temperature control sequences herein specified shall be the responsibility of this Contractor and installed in strict accordance with the National Electrical Code.

2. Power wiring required to energize the control systems shall be the responsibility of this Contractor and executed by the Electrical Contractor.

3. Wiring associated with DDC components shall be twisted, low voltage, shielded (as required), plenum cable.

4. Exposed wiring shall be installed in DEDICATED electrical metallic tubing with set-screw and compression type couplings and connectors for interior dry locations and interior wet locations or exterior locations, respectively.

5. Provide conduit labels (located to ensure continuous systems recognition) and identification at wiring terminations).

B. Automatic dampers:

1. Units which are shown on the drawings to serve as automatic mixing dampers shall be sized and arranged as shown with the blades of the automatic outside air and return air dampers (6” width, maximum) positioned to insure impingement of their respective air streams.

C. REMOVE ALL EXTRANEOUS PORTIONS OF EXISTING CONTROL SYSTEMS THAT ARE

UNNECESSARY TO COMPLEMENT THE PROPOSED RETROFIT.

3.02 SEQUENCES

A. System Control, General:

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1. The fundamental objective of the control sequences is to provide system control of reasonable complexity that minimizes energy consumption while meeting the associated demands.

2. Unless otherwise specified and/or noted, all temperatures shall be considered as dry bulb graduations.

3. Airside economizer/return air related enthalpy preference shall be determined in context with global outside air and return air temperature and humidity sensors.

4. Software formulated optimization relative to systems and/or systems components operation shall be manifested by appropriately developed algorithms considering pertinent variables and associated trend logs.

5. Time-of-day scheduling shall automatically (with manual over-ride) select the system cycles (occupied, unoccupied) of operation.

B. B/C Chilled Water Plant Control:

a. System operation shall be continuous serving:

1) Precision environmental control systems energy rejection.

2) Central station air handling systems.

b. Principal equipment and associated ancillaries shall be staged by utilizing:

1) The waterside economizer in context with the prevailing ambient wet bulb temperature.

2) The nominal 250 ton (shoulder season) rotary screw chiller whenever the waterside economizer is not operational and the system demand is within its capacity.

3) The variable speed nominal 500 ton centrifugal chiller whenever the waterside economizer and shoulder season chiller are not operational.

4) The nominal 500 ton constant speed centrifugal chiller as standby for the nominal 500 ton variable speed centrifugal chiller.

2. System pumps control:

a. CHW generation (P-CHWG-B/C-1, P-CHWG-B/C-2, P-CHWG-B/C-3, P-

CHWG-B/C-4):

1) Units shall operate in context with the CHW temperature control arrangement herein described.

b. CHW distribution (P-CHWD-B/C-1, P-CHWD-B/C-2):

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1) Units shall operate conjunctively with a programmed “lead-lag”/equal run time arrangement.

2) The lead unit shall operate continuously.

3) Should the lead unit fail, a current sensing arrangement shall energize the lag unit.

4) As the required capacity of terminal heat transfer surfaces varies and the associated terminal and tertiary crossover bridge 2-way control valves modulate accordingly, a PCM, in combination with a differential pressure sensing arrangement indicated on the drawings, shall vary the lead (or lag, whichever is operational) unit’s speed via an adjustable frequency controller to maintain its empirically determined set point.

c. CHW tertiary (P-CHWD-A-1, P-CHWD-A-2, P-CHWD-D-1, P-CHWD-D-2):

1) Units shall operate conjunctively with a programmed “lead-lag”/equal run time arrangement.

2) The lead unit shall operate continuously.

3) Should the lead unit fail, a current sensing arrangement shall

4) As the required capacity of terminal heat transfer surfaces varies and the associated 2-way control valves modulate accordingly, a

PCM in combination with a differential pressure sensing arrangement indicated on the drawings shall vary the lead (or lag) unit’s speed via an adjustable frequency controller, to maintain its empirically determined set point.

d. CW (P-CW-B/C-1, P-CW-B/C-2, P-CW-B/C-3, P-CW-B/C-4, P-CW-B/C-5):

1) Units shall operate in context with the CHW temperature control arrangement herein described and a programmed “Lead-

Lag”/equal run time (P-CW-B/C-2, P-CW-B/C-3; P-CW-B/C-4, P-

CW-B/C-5).

2) Should the lead unit fail, a current sensing arrangement shall

3. System CHW temperature control:

a. Whenever the ambient wet bulb temperature is less than 45F, a PCM in combination with a temperature sensor located in the CHW distribution pumps discharge piping shall initiate the following in sequence on a fall in temperature to maintain its set point (50F):

1) Drive the cooling tower fan to minimum speed (30%) via its adjustable frequency controller.

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2) De-energize, then re-energize the cooling tower fan at 50% reverse speed.

3) Drive the cooling tower fan to minimum reverse speed (10%).

4) De-energize the cooling tower fan.

5) Drive the associated bypass valve assembly to its full bypass, no cooling tower flow position.

b. Whenever the waterside economizer is not operational:

1) A PCM in combination with a temperature sensor located in the

CHW distribution pumps discharge piping and with flow switches sensing respective CHW and CW flow shall stage the chillers in accordance with the aforementioned sequence to maintain its set point, which shall be reset in context with ambient outside air temperature:

a) 46F CHWS at 55F (or less) OA.

b) 42F CHWS at 80F (or greater) OA.

2) A PCM in combination with a temperature sensor located in the tertiary pumps discharge piping shall modulate the normally open

2-way control valve in the associated crossover bridge to maintain its set point, which shall be reset in accordance with ambient outside air temperature (formulated to achieve the maximum possible CHWR temperature while satisfying space sensible and latent demands):

a) 50F CHWS at 55F (or less) ambient OA.

b) 46F CHWS at 80F (or greater) ambient OA.

3) As the required capacity of the respective chiller condenser varies, a PCM in combination with a refrigerant pressure sensor shall initiate the following on a rise in pressure to maintain its set point:

a) Drive the bypass valve assembly to its normally open, full cooling tower flow position.

b) Drive the cooling tower fan to full speed via its adjustable frequency controller.

4) System CW make-up control:

a) As the demand for CW evaporation and bleed-off varies, a

PCM in combination with a indoor CW sump water level pressure sensor shall modulate the associated normally closed make-up water control valve to maintain its set point and de-energize the CW generation pumps whenever the water level falls below its low limit set point.

4. Monitoring:

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a. Pumps lead/lag designation.

b. Pumps status.

c. Chillers status.

d. Cooling towers status.

e. Waterside economizer status.

f. Generation CHWS temperatures.

g. Generation CHWR temperatures.

h. Distribution CHWS temperature.

i. Distribution CHWR temperature.

j. CHW decoupler (bypass) temperature.

k. Tertiary CHWS temperatures.

l. Tertiary CHWR temperatures.

m. Distribution CHW flowrate.

n. CWS temperatures.

o. CWR temperatures.

p. Indoor CW sumps water level.

q. CW make-up water valve position.

5. Alarms:

a. Equipment failure:

1) Chillers.

2) Cooling towers.

3) Pumps.

b. High distribution CHWS temperature.

c. High tertiary CHWS temperatures.

d. High CW temperatures.

e. Low indoor CW sump water levels.

END OF SECTION