12892026 Amendment 0005.pdf
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- Solicitation number
- 7385095
About this file
This document is a Chilled Water System Control Diagram (drawing M-702) for a technical HVAC system, prepared by Mason-Hanger for NAVFAC (Naval Facilities Engineering Command). The detailed technical drawing provides a comprehensive schematic of a chilled water plant management system, including multiple components such as childers, control valves, flexible pipe connectives, and various measurement points like temperature and flow sensors.
The diagram's accompanying notes describe a complex chilled water control system designed to integrate with a building's digital control infrastructure. Key system features include temperature and pressure monitoring, digital system controllers, bypass valve controls, and capabilities for managing chiller loads across multiple points (ACC-1 LOAD, ACC-2 LOAD). The system appears engineered for precise environmental control, with redundant measurement and control mechanisms to ensure consistent performance and efficiency in a mechanical/HVAC application.
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CHILLED WATER SYSTEM CONTROL DIAGRAM
GENERAL:
A SINGLE CHILLED-WATER PLANT MANAGEMENT SYSTEM SHALL BE PROVIDED TO
CONTROL OPERATION AND STAGING OF THE CHILLERS AND CHILLED WATER
PUMPS. FUNCTIONS SHALL INCLUDE BUT NOT BE LIMITED TO MODULATING THE
BUILDING CHILLED WATER BYPASS VALVE, CHILLER START/STOP, MONITORING
EXISTING BUILDING CHILLED WATER SUPPLY AND RETURN TEMPERATURES[(E)
CHW-ST & (E)CHW-RT], CHILLER LOADS [ACC-1-LOAD & ACC-2-LOAD], AND OTHER
POINTS AS INDICATED ON THE POINTS LIST ON DRAWING M-703.
THE CHILLED-WATER PLANT MANAGEMENT SYSTEM SHALL ALTERNATE PUMP
OPERATION. SCHEDULED CHILLED WATER PUMPS HAVE N + 1 REDUNDANCY AND
CHILLERS SHALL AUTOMATICALLY SWITCH TO THE AVAILABLE PUMP IN CASE OF
PUMP FAILURE. PUMPS ARE CONSTANT FLOW AND NO MODULATION IS REQUIRED.
THE CHILLER AND PUMP SEQUENCES SHALL BE COORDINATED WITH THE CHILLER
MANUFACTURER REQUIREMENTS TO AVOID THE PUMP NOT STARTING AND THE
CHILLER HAVING A FREEZING/FAILURE EVENT.
THE CHILLED-WATER PLANT MANAGEMENT SYSTEM SHALL INTEGRATE WITH THE
EXISTING CAMPUS BUILDING AUTOMATION SYSTEM DDC CONTROLLER.
BUILDING CHILLED WATER BYPASS VALVE CONTROL:
A DIFFERENTIAL PRESSURE TRANSMITTER [(E)CHW-DP] SHALL SENSE THE
CHILLED WATER SYSTEM DIFFERENTIAL PRESSURE BETWEEN THE SUPPLY AND
RETURN MAINS. IF THE CHILLED WATER SYSTEM DIFFERENTIAL PRESSURE RISES
ABOVE SETPOINT [(E)CHW-DP-SP], THE DIGITAL SYSTEM CONTROLLER SHALL
MODULATE THE BUILDING CHILLED WATER BYPASS VALVE OPEN TO BYPASS
CHILLED WATER FROM THE SUPPLY MAIN TO THE RETURN MAIN. IF THE BUILDING
CHILLED WATER SYSTEM DIFFERENTIAL PRESSURE SENSOR FALLS BELOW
SETPOINT [(E)CHW-DP-SP],THE DIGITAL SYSTEM CONTROLLER SHALL MODULATE
THE BUILDING CHILLED WATER BYPASS VALVE CLOSED TO ALLOW MORE CHILLED
WATER TO FLOW INTO THE SUPPLY MAIN. THE BYPASS CONTROL VALVE SHALL
MODULATE TO MAINTAIN A FIXED DIFFERENTIAL PRESSURE AS FOUND BY THE TAB
CONTRACTOR.
BUILDING TONNAGE MONITORING:
A FLOW METER SHALL INPUT SUPPLY CHILLED WATER FLOW TO THE BUILDING TO
THE DIGITAL SYSTEM CONTROLLER. THE DIGITAL SYSTEM SHALL CALCULATE THE
INSTANTANEOUS BUILDING TONNAGE AT 10 MINUTE INTERVALS. THE DIGITAL
SYSTEM SHALL ALSO SUM BUILDING TON HOURS ON A WEEKLY BASIS AND STORE
IT IN A DATABASE AND SHALL INCLUDE THE DATES THE SUMMATION OCCURRED.
THIS INFORMATION SHALL BE AVAILABLE ON THE EXISTING NETWORK.
CHILLER CONTROL:
UPON A CALL FOR COOLING, THE MAIN CHILLER SHALL OPEN ITS RESPECTIVE
CONTROL VALVE [CV-1 OR CV-2] AND START THE LEAD PUMP. AFTER THE CHILLED
WATER FLOW SWITCH [ACC-1-FS OR ACC-2-FS] PROVES FLOW, THE DIGITAL
SYSTEM SHALL ENABLE THE LEAD CHILLER [ACC-1-SS OR ACC-2-SS]. THE LEAD
CHILLER SHALL INITIATE ITS START SEQUENCE TO MAINTAIN THE DESIGN LEAVING
WATER TEMPERATURE [ACC-1-LWT OR ACC-2-LWT] THROUGH ITS OWN ON-BOARD
CONTROLS. IF THE BUILDING CHILLED WATER SUPPLY TEMPERATURE [(E)CHW-ST]
IS ABOVE SETPOINT BY 2°F (ADJ) FOR 15 MINUTES (ADJ), ENABLE THE LAG
CHILLER'S CHILLED WATER PUMP [ACC-1-SS OR ACC-2-SS] AND OPEN THE LAG
CHILLER'S CONTROL VALVE. AFTER THE CHILLED WATER FLOW SWITCH [ACC-1-FS
OR ACC-2-FS] PROVES FLOW, THE DIGITAL SYSTEM SHALL ENABLE THE LAG
CHILLER [ACC-1-SS OR ACC-2-SS]. THE LAG CHILLER SHALL INITIATE ITS START
SEQUENCE TO MAINTAIN THE DESIGN LEAVING WATER TEMPERATURE [(E)CHW-
SP] THROUGH ITS OWN ON-BOARD CONTROLS. IF THE BUILDING CHILLED WATER
SUPPLY TEMPERATURE [(E)CHW-ST] IS 2°F (ADJ) BELOW SETPOINT [(E)CHW-SP]
FOR 30 MINUTES (ADJ) AND THE LAG CHILLER IS AT OR BELOW THE 30% (ADJ)
CHILLER LOAD [ACC-1-LOAD OR ACC-2-LOAD] (ADJ), THE DIGITAL SYSTEM
CONTROLLER SHALL DISABLE THE LAG CHILLER. THE CHILLER CONTROLLER
SHALL CLOSE ITS RESPECTIVE CONTROL VALVE AND SHUT DOWN THE LAG PUMP
BASED UPON ITS OWN LOGIC. IF THE BUILDING CHILLED WATER SUPPLY
TEMPERATURE [(E)CHW-ST] IS LESS THAN SETPOINT [(E)CHW-SP] BY 2°F (ADJ) AND
CHILLER IS AT OR BELOW 10% CHILLER LOAD [ACC-1-LOAD OR ACC-2-LOAD], THE
DIGITAL SYSTEM SHALL DISABLE THE LEAD CHILLER. THE LEAD CHILLER PUMP
SHALL CONTINUE TO OPERATE AN ADDITIONAL 5 MINUTES (ADJ). IF THE BUILDING
CHILLED WATER SUPPLY TEMPERATURE [(E)CHW-ST] IS 4°F (ADJ) ABOVE
SETPOINT [(E)CHW-SP] FOR 15 MINUTES (ADJ), THE DIGITAL SYSTEM CONTROLLER
SHALL INITIATE THE CHILLER START SEQUENCE AS DESCRIBED ABOVE. WHEN
THE DIGITAL SYSTEM CONTROLLER INITIATES CHILLER SHUTDOWN, THE
CHILLER'S SHALL CLOSE ITS RESPECTIVE CONTROL VALVE [CV-1 OR CV-2] ONLY
AFTER PUMP HAS SHUT DOWN AND FLOW SWITCH [ACC-1-FS OR ACC-2-FS]
PROVES NO FLOW. THE DIGITAL SYSTEM CONTROLLER SHALL ALTERNATE LEAD
AND LAG CHILLERS ON A WEEKLY BASIS.
(E)BBV
ACC-1
D.V.
(E)AS-1
M
CHP-2
CHS
CHR
CHS
(E)CHR (E)CHR
(E)CHS
CHR
TT DPT
(E)CHW ET
(E)MAKE UP WATER
(E)CHW-ST
(E)CHW-RTTT
TT
(E)CHW-DP
CHP-1
CHP-1-S
CHP-1-SS
(E)CHW-FLOW
BT
-1
TT
ACC-1-EWT
ACC-1-LWT
ACC-2
CHS
CHR
TT
FLEXIBLE PIPE CONNECTORS (TYP) TT M
CV-2
CHP-2-S
CHP-2-SSFLEXIBLE PIPE CONNECTORS (TYP)
ACC-1-FS
ACC-2-EWT
ACC-2-LWT
ACC-2-FS
ACC-1-LOAD
ACC-1-S
ACC-1-SS
ACC-2-LOAD
ACC-2-S
ACC-2-SS
TT
(E)CHW-SP (VIRTUAL POINT)
DP
(E)CHW-DP-SP (VIRTUAL POINT)
M
CV-1
CHP-3
CHP-3-S
CHP-3-SS
SATISFACTORY TO DATE
APPROVED
ACTIVITY
FOR COMMANDER NAVFAC
SEAL
A/E INFO
A
B
C
D
1 2 3 4 5
1 2 3 4 5
A
B
C
D
SCALE:
MAXIMO WORKORDER NO:
SHEET
NAVFAC DRAWING NO.
DES DRW CHK
OF
PROJECT NO:
D
EP
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C O
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DRAWFORM REVISION: 25 AUGUST 2020
PM/DM
BRANCH MANAGER
CHIEF ENG/ARCH
FIRE PROTECTION
NA
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AS NOTED
UNCLASSIFIED
UNCLASSIFIED
UN
CL
AS
SI
FI
ED
FINAL SUBMITTAL
NICHOLAS A. HALL
NICHOLAS A. HALL
PATRICK FAULKNER
EE
M-702
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MARCH 22, 2024
199.23
7385095
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