CCPEOC – Central Chiller Plant Energy Optimization Controller
Guide Specification
1.1 CCPEOC DESCRIPTION
A. The Central Chiller Plant Energy Optimization Controller, CCPEOC or EOC, is a chiller installed or
remotely installed hardware and software control system consisting of an open-protocol
Niagara Framework “Tridium” JACE platform and chiller plant operation software engineered to
directly monitor, control, stage and optimize the chiller, its compressors and other connected
mechanical equipment and instrumentation such as cooling towers, pumps and valves to
produce the required thermal duty at the lowest possible total kW/ton energy consumption.
1.2 APPROVED SUPPLIERS
The control contractor shall use only the manufacturers listed below for the
Central Chiller Plant Energy Optimization Controller - ArcticJACE EOC
ARCTIC CHILLER GROUP – Arctic Cool Chillers, Ltd.
2100 Steeles Avenue East
Brampton, ON Canada L6T 1A7
(905) 789-9988
ArctiChill
200 Park Avenue
Newberry, SC 29108
(800) 849-7778
1.3 QUALITY ASSURANCE
A. All EOC products and manufacturer supplied connected devices and systems, and the
components used therein shall be nationally recognized and readily available brands, new and
currently manufactured items. This provision applies to the central controller hardware and the
User Interface. The use of proprietary controller hardware or interface screen shall not be
acceptable. All EOC hardware must be readily available in local and regional industrial and
electrical equipment supply companies.
B. Codes and Standards: The Controls Contractor shall meet all applicable local and national
standards, practices and codes as well as the requirements indicated herein.
1. Bear the UL Mark
2. Bear the ETL mark
3. Remote control panel provided shall be assembled in a UL or ETL Certified facility.
4. Hardware JACE – All hardware shall be open protocol Tridium JACE using Niagara
Framework technology. Execution code shall run live on industrial JACE hardware. The use
of SoftJACE or compiled code running in MS Windows Embedded shall not be acceptable.
5. The EOC shall be designed to natively operate with all major versions of Building
Automation Systems without the use of external protocol translators.
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6. EOC Input/Output modules and interface screens shall be hardware commonly available at
supply companies. EOC containing proprietary hardware available from a single supplier is
not accepted.
FUNCTIONAL REQUIREMENTS
A. General Software Requirements
1. EOC software shall monitor and optimize the energy required for chilled water production
using engineered control software approaches as measured in input kW energy at each node
and the total kW of the chilled water plant with all connected components.
2. The software and the user interface functionality shall be designed to provide complete
operator control of functions and set points as prescribed in this Specification.
3. The Software shall utilize control and wiring in a home-run method where each connected
components shall be directly connected to terminal blocks of the EOC. To facilitate
serviceability and troubleshooting the use of series control loops that connect more than one
controlled node component shall not be acceptable. Only dedicated connections and control
between the EOC and the controlled device shall be accepted.
B. Optimization Functions: The EOC shall control and optimize the following:
1. Staging and VSD Speed Control of Chillers
a.) Stage entire chillers in and out of service as required to meet dynamic building thermal
loads and minimize the total kW required for chilled water production at each chiller.
Dynamically set chiller sequencing based on load side variations in demand, scheduled
load timing and pull-down rate.
b.) Dynamically adjust chiller sequencing set points based on real time calculation of
compressor kW efficiency and available operating envelope at that set of conditions.
c.) Dynamically adjust the chilled water temperature set point in response to user dictated
sequences to facilitate energy reduction when AHU loads are reduced to a prescribed
and controller settable level and to meet demand-response requirements, if any.
2. Staging and VSD Speed of Chilled Water Pumps
a.) Stage and optimize the rotational speed and energy of connected chilled water pumps
and their VSD drives to provide adequate flow in the chiller to maintain correct fluid
velocities and avoid laminar flow conditions.
b.) EOC shall correlate chiller staging with pump staging and speed and shall automatically
operate chilled water isolation valves at any chiller piped in parallel to assure no chilled
water or condenser water mixing occurs during chiller staging sequences and to prevent
excessive fluid velocities in parallel installations.
c.) Dynamically set chilled water pump VSD speed to maintain load-side AHU differential
pressure corresponding with the dynamic load. Continuously monitor differential
pressure transmitters installed at load-side AHU(s) to correlate chilled water pump
speed with variations of load.
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3. Cooling Tower Staging and Condenser Water Pumping
a.) Utilize ambient temperature and RH sensors to dynamically calculate enthalpy at the
cooling towers. EOC shall utilize these values to set cooling tower fan speed and
condenser water pump speed and bypass valve positions to maximize available outdoor
conditions and dynamically reduce chiller energy.
b.) Dynamically adjust cooling tower staging of multiple parallel cooling towers and VSD fan
speed and connected condenser water pumps to correlate the optimum condenser
water temperature and flow rate to minimize chiller compressor energy while
minimizing combined total kW of chillers, fans and condenser water pumps.
c.) EOC shall have settable minimum flow rates for condenser water VSD pumps to meet
the minimum flow requirements of the flow nozzles of the cooling tower and to assure
complete distribution of condenser water across the tower fill.
d.) Energy optimization methods which rely on simple cooling tower sump temperature and
not enthalpy calculations, or methods than employ simple chiller and drive power input
without adaptive calculation of real-time compressor operating envelopes, including socalled “wire-to-water”, “natural curve” and “Equal Marginal Performance Principal”
methods are not accepted. EOC shall have direct communications with the chiller
controller and use the data from each compressor in order to meet this requirement.
4. Condenser Water Bypass Valve Operation
a.) Dynamically adjust condenser bypass valve position to maintain correct compressor
head pressure during cold start operations and to assure minimum capacity is met
during energy-optimized low condenser water temperature operation.
b.) EOC shall have user control settings that define the priority of capacity over energy, or
energy over available capacity and shall automatically protect the compressor from
surge and choke conditions that can be caused by reduced condenser water
temperatures by reducing capacity and/or changing chilled water temperature set
points to compensate. EOC methods that do not have the ability to correlate real-time
dynamic compressor envelopes with bypass valve operation, but rely on simple input
energy to the chiller shall not be acceptable.
5. User Interface Requirements
a.) EOC shall provide an industrial 15” or larger high-contrast 16-bit color touch-screen user
interface using standard non-proprietary hardware. The UI shall display and provide
drill-down capabilities for all current plant optimization nodes. Valve positions,
component staging, chiller energy and total plant kW/ton, set points and current values
from sensors and actuators shall be clearly displayed.
b.) The interface screen operation shall not be dependent on the EOC controller hardware
so that the EOC can operate normally even if the screen is absent or not functioning.
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c.)
d.)
e.)
f.)
g.)
EOC systems where the screen and controller are mutually dependent for normal plant
operation shall not be acceptable.
EOC shall provide native RJ45 Ethernet capabilities and shall provide LAN based or
Wireless WiFi based secure VPN communications for remote user access and control
using industrial grade DIN mounted and panel wired access point. Access protocols that
rely on Microsoft Windows runtime layers or that do not provide industrial DIN mount
standard VPN connectivity or require separate VPN access licenses shall not be
acceptable.
Remote communications that rely on consumer or commercial grade static IP routers or
gateways shall not be acceptable. EOC manufacturers shall provide IT support for
Owners to configure secure VPN access and firewall 1:1 Network Address Translation
settings to assure reliable operation and secure remote access.
Failure of any EOC connected device or operating conditions that results in a change in
optimization functions shall be indicated on the display. To facilitate serviceability and
troubleshooting, all connected devices shall be wired in home-run fashion. Systems that
use series BUS loops that contain more than one control or sensing node shall not be
acceptable. An alarm condition shall cause the EOC to change registers that can be
monitored by the building BAS control system.
Documentation shall be accessible at the EOC interface and shall include at a minimum
Operations and Maintenance Manual, Sequence of Operation and Wiring Diagrams with
final, as commissioned terminal block landing locations for all connected and separately
run nodes.
Integrated Compressor Software – The EOC shall include an industrial form-factor PC
with capability to run Danfoss Compressor Monitoring Software.
1. SUBMITTALS
a. The EOC hardware including manufacturer supplied sub-systems, drives and periphery
instrumentation shall be presented in a formal Submittal within one week of Order. The
Submittal and related documents shall be reviewed by the consulting engineer in a
timely manner and returned with mark-ups or authorization to the Manufacturer or its
authorized representative.
b. Component purchasing, factory engineering or fabrication shall not commence until a
signed Submittal authorizing a release for manufacturing is received and accepted.
c. The CCPEOC supplier shall submit the following within 10 days of contract award:
Hardware Submittals:
1. Process and Instrumentation diagram showing the controller and
connected pump and fan drives, sensors and actuators that are
connected to the EOC system.
2. A system hardware listing of equipment indicating unit quantity,
manufacturer, model number and component manufacturer’s technical
data sheets.
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3. Diagrams of connection points of all hardware devices with reference
documents for power and control wiring with terminal locations.
ii. Software Submittals:
1. Narrative sequence of operation for the EOC optimization control logic
and the connected chillers, pumps and fan energy nodes under its
control.
2. Basic operator instructions with referenced screen images for EOC
controller, interface screen and any control adapters utilized in the
control or communications protocol employed.
3. Energy analysis showing the predicted performance in kW/ton and total
projected kW consumption of the CCP across one annualized period
correlating in 10% increments:
(a) the annualized load profile of the EOC thermal requirement
(b) the annualized condenser water temperature profile and
(c) the CCP equipment energy profile including all EOC chillers and
drives.
(d) the kW/ton effect of utilizing chilled water resets at various load
points
4. The chiller(s) performance shall be AHRI Certified at AHRI conditions
and AHRI documents for the chiller(s) models chosen shall be provided
showing standard IPLV rating and NPLV performance under the
conditions prescribed in the Specifications and Schedule. NPLV
performance shall not be AHRI Certified for performance, and be
selected to optimize the chosen compressor technology to minimize
total plant energy consumption while meeting minimum system load
requirements.
5. A list and description of controller data registers for use with the
Building Automation System
1.5 EXECUTION
C. The EOC supplier shall engineer, program and configure components to meet the load profile
requirements of the site while minimizing component and total chiller plant energy using
optimized component staging and loading and correlating in real time chiller energy, available
condenser temperature and tower fan drive speed and other dynamic set points.
D. The EOC supplier shall provide manufacturer supplied hardware to the appropriate Mechanical
and Controls Contractors for installation. EOC that are engineered for remote mounting (not
inside the chiller) shall arrive in a NEMA rated ETL or UL enclosure completely assembled and
wired. The EOC manufacturer shall not be responsible for installation of cables or conduit for
the operation of the EOC. All installation tasks shall be the responsibility of site contractors so
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that commissioning of the EOC and connected components can take place on one site visit of
factory personnel.
E. Upon completion of the installation of the EOC hardware and Manufacturer Certified
commissioning, and upon final acceptance of the equipment by the owner, the manufacturer
shall provide the services and documentation described below. The Owner shall certify in
writing that the EOC operation is accepted and meets Engineers specifications.
1. EOC Settings and Commissioning – The EOC shall be fully commissioned, including
verification and documentation of the EOC settings for the operation and optimization
control sequences of all EOC connected chillers, fans, pumps, valves, drives and reset
functions, to assure all communication nodes and control logic is functioning in accordance
with the submittal.
2. Project Specific Software – Software, screen images and documentation developed
specifically this EOC installation shall be transferred to the Owner in its source format.
3. Owner Training and Documentation – The EOC supplier shall provide owner’s technical
representative(s) complete training in the use, operation and administration of the EOC,
including factory certified instructions regarding the chiller and its controls. Training shall
take place at the location of the EOC installation and shall be not less than one day in length.
Training shall include in-depth understanding of the control methods and settings.
4. Perpetual Use License for EOC software. Use license includes the provision for annual
maintenance and site support fees as applicable.
5. Electronic files containing the EOC user programs and display screen software, if any.
6. Equipment warranties for EOC and manufacturer supplied and connected components.
7. First-Year Continuous Commissioning. The EOC provider shall provide at no charge to the
Owner monthly monitoring of the installation using the secure VPN internet access
provided. Internet access, RJ45wiring to the panel and/or WiFi SIM cards are the
responsibility of the Owner and must be in place for Remote Continuous Commissioning to
occur. The following services shall be provided with this Service.
a.) On a monthly basis, EOC personnel shall with the Owners on-site technician perform
analysis and adjustment of the thermal load profile, component level energy and staging
and energy optimization settings to assure the EOC is operating at intended and peak
performance.
b.) Analysis of the chiller and plant energy usage versus baseline.
c.) Verification of operating sequence during the previous month staging events.
d.) Review of previous month alarm logs and relevant changes or insights from the logs.
e.) Dynamic Commissioning Service, DCS - After the initial year, the EOC provider shall offer
dynamic system monitoring, including the automatic secure remote server-based polling
and transfer of all analog and digital values on the EOC controller. Owners can
“Subscribe” to a web based service that provide a dashboard of current values, trended
history, and enables automatic user-settable triggers to alert users of changes to any
digital state or analog value. The system shall enable remote access and optional direct
control over register values and settings. This DCS service shall provide expert oversight
by experienced EOC personnel.
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1.2 ACCEPTANCE AND WARRANTY
A. Hardware: 18 Month Warranty - EOC hardware shall be warranted free from defects for a
period of twelve (12) months after date of acceptance, not to exceed 18 months from date of
shipment. Hardware failures during the warranty period shall be adjusted, repaired, or replaced
at no charge to the Owner when installed, configured and used as designed and commissioned.
B. Software: Ten-Year Warranty - EOC software shall be warranted to operate as designed to
control and energy-optimize commissioned energy nodes for ten years from date of
acceptance.
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