Attch 25 M805.pdf

CHILLED WATER SYSTEM MAIN DISTRIBUTION CONTROL DIAGRAM

SCALE: NTS

ET-1

P-2P-1

CWS

CWS

TYPICAL ZONE

CRAC

C W

S

C W

R

C W

S

C W

S

C W

R

CWR

C W

S

C W

S

C W

S

C W

S

VFD

BO - PUMP ENABLE/DISABLE

BI - PUMP VFD FAULT

BI - PUMP STATUS

T

AI - DISTRIBUTION WATER SUPPLY TEMPERATURE

T

AI - DISTRIBUTION WATER

RETURN TEMPERATURE

SEQUENCE OF OPERATION:

THE SYSTEM SHALL CONSIST OF TWO (2) DISTRIBUTION PUMPS THAT ARE INTEGRAL TO ACC-1.

RUN CONDITIONS:

LEAD CHILLED WATER PUMP SHALL BE ENERGIZED BY THE BAS WHENEVER:

-ANY ZONE IS OCCUPIED

-OR A DEFINABLE NUMBER OF UNOCCUPIED ZONES CALL FOR HEATING OR COOLING

GENERAL: THE CONTROL STRATEGY IS TO OPERATE THE PRIMARY CHILLED WATER VARIABLE SPEED PUMPS IN ORDER TO MINIMIZE PUMPING POWER REQUIREMENTS. THE SPEED DRIVE OF THE VARIABLE SPEED CHILLED WATER PUMP(S) IS

CONTROLLED TO MAINTAIN A SETPOINT DIFFERENTIAL PRESSURE NEAR CRAC-3.

CHILLER SHALL UTILIZE AN INTEGRAL VARIABLE SPEED PUMPING PACKAGE TO MINIMIZE PUMPING POWER REQUIREMENTS.

THE SPEED DRIVE OF THE VARIABLE SPEED PUMPS SHALL BE CONTROLLED BY THE DIFFERENTIAL PRESSURE SENSOR UNTIL THE FLOW HAS REACHED THE MINIMUM REQUIRED FLOW THROUGH THE CHILLER AS SENSED BY THE FLOW METER AT WHICH POINT THE PUMP SPEED SHALL BE HELD CONSTANT AND THE BYPASS VALVES V-2 AND V-3 SHALL MODULATE OPEN TO MAINTAIN MINIMUM FLOW THROUGH THE CHILLER . THE DDC CONTROLLER SHALL BE DESIGNED TO START AND STOP THE PUMPS AND MODULATE THEIR SPEED AS REQUIRED TO MEET THE SYSTEM DEMANDS. THE SYSTEM SHALL BE DESIGNED TO MAINTAIN A DIFFERENTIAL PRESSURE SETPOINT AT A REMOTE LOCATION. THE LEAD PUMP SHALL BE STARTED AND STOPPED BY THE DDC CONTROLLER. THE LEAD PUMP SHALL BE STARTED AND STOPPED AS REQUIRED TO MAINTAIN THE SYSTEM DIFFERENTIAL SETPOINT. THE DDC CONTROLLER SHALL ALTERNATE PUMPS WEEKLY BY SELECTING THE PUMP WITH THE LEAST TOTAL ACCUMULATED RUN TIME AS CALCULATED AND STORED AT THE DDC CONTROLLER. IF EITHER SELECTED LEAD PUMP'S PROOF SWITCH DOES NOT DETECT FLOW WITHIN 30 SECONDS FROM THE START SIGNAL, THE DDC CONTROLLER SHALL DE-ENERGIZE THE FAILED PUMP, START THE STANDBY PUMP, AND TRANSMIT A PUMP FAILURE ALARM. A PROGRAMMED ANTI-RECYCLE TIMER SHALL PREVENT PUMP SHORT CYCLING. THE DDC CONTROLLER SHALL AUTOMATICALLY ATTEMPT A RESTART OF THE CIRCULATING PUMPS ON A PERIODIC BASIS TO ACCOMMODATE SERVICE SHUTDOWNS AND EXTENDED POWER OUTAGES. IF THE PUMP STATUS DOES NOT MATCH THE COMMAND, AN ALARM WILL BE GENERATED AND THE PUMP WILL BE STOPPED. UPON LOSS OF STATUS, THE PUMP WILL RESTART AFTER

THE SYSTEM RESET IS ACTIVATED.

THE FOLLOWING DISTRIBUTION WATER CONDITIONS SHALL BE MONITORED:

- FLOW STATUS

- PUMP STATUS

- SUPPLY TEMPERATURE

- RETURN TEMPERATURE

ALARMS SHALL BE PROVIDED AND ALL CONNECTED EQUIPMENT SHUTDOWN SIGNAL SHALL BE GENERATED UPON ANY OF

THE FOLLOWING

DISTRIBUTION WATER CONDITIONS:

- NO DISTRIBUTION WATER FLOW

- HIGH DISTRIBUTION WATER SUPPLY TEMP SHUTDOWN: IF THE DISTRIBUTION WATER SUPPLY TEMPERATURE IS

GREATER THAN 110°F (ADJ.)

- LOW DISTRIBUTION WATER SUPPLY TEMP SHUTDOWN: IF THE DISTRIBUTION WATER SUPPLY TEMPERATURE IS

LESS THAN 45°F (ADJ.)

ALARMS SHALL BE PROVIDED FOR THE FOLLOWING:

- PUMP FAILURE: COMMANDED ON, BUT THE STATUS IS OFF

- RUNNING IN HAND: COMMANDED OFF, BUT THE STATUS IS ON

- RUNTIME EXCEEDED: STATUS RUNTIME EXCEEDS A USER DEFINABLE LIMIT (1,000 HOURS, ADJ. OR MINIMUM

MAINTENANCE INTERVAL AS RECOMMENDED BY EQUIPMENT MANUFACTURER)

- VFD FAULT

POINTS NAME

HARDWARE POINTS SOFTWARE POINTS

AI AO BI BO

DISTRIBUTION WATER RETURN TEMPERATURE

AV BV LOOP SCHEDULE TREND ALARM SHOW ON GRAPHIC

CHILLED WATER DISTRIBUTION PUMP SYSTEM MAIN POINTS LIST:

DISTRIBUTION WATER SUPPLY TEMPERATURE

DISTRIBUTION WATER FLOW STATUS

PUMP CHP-1 ENABLE/DISABLE

PUMP CHP-2 ENABLE/DISABLE

PUMP CHP-1 STATUS

PUMP CHP-2 STATUS

PUMP FAILURE CHP-1

PUMP RUNNING IN HAND CHP-1

PUMP RUNTIME EXCEEDED CHP-1

PUMP FAILURE CHP-2

PUMP RUNNING IN HAND CHP-2

NO DISTRIBUTION FLOW

HIGH DISTRIBUTION WATER SUPPLY

TEMPERATURE SHUTDOWN

LOW DISTRIBUTION WATER SUPPLY

TEMPERATURE SHUTDOWN

HIGH DISTRIBUTION WATER SUPPLY

TEMPERATURE

LOW DISTRIBUTION WATER SUPPLY

TEMPERATURE

HIGH DISTRIBUTION WATER DIFFERENTIAL PRESSURE

LOW DISTRIBUTION WATER DIFFERENTIAL PRESSURE

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

(CHILLED WATER DISTRIBUTION PUMP SYSTEM)

PUMP RUNTIME EXCEEDED CHP-2 X

DP

AI - DIFFERENTIAL PRESSURE

AI - PUMP SPEED

PUMP CHP-1 SPEED CONTROL X X X

PUMP CHP-2 SPEED CONTROL X X X

DIFFERENTIAL PRESSURE X X X

FS

BI - FLOW STATUS

FLOW STATUS XXX

ACC-1

M

CT

V F D

BI - CHILLER VFD FAULT

BO - CHILLER ENABLE/DISABLE

AO - CHILLER VFD SPEED

BI - CHILLER STATUS

BI - VIBRATION STATUS

CWS

CWR

CHILLED WATER SUPPLY TEMPERATURE X

X

X

X

X

X

X

X

X

X

CHILLED WATER RETURN TEMPERATURE

FAN SPEED STATUS X X

FAN ENABLE/DISABLE

OUTSIDE AIR TEMPERATURE DRY BULB

OUTSIDE AIR TEMPERATURE WET BULB

X

X X

FAN FAILURE

FAN RUNNING IN HAND

FAN RUNTIME EXCEEDED

X

X

X

HIGH CHILLER WATER SUPPLY TEMPERATURE

LOW CHILLER WATER RETURN TEMPERATURE X

X

BYPASS VALVE XX X

EQUIPMENT YARD

ARTIFACT STORAGE

BUILDING

SEQUENCE OF OPERATION: (CHILLED WATER SYSTEM COOLING)

CHILLED WATER SYSTEM CONSISTS OF ONE (1) AIR COOLED CHILLER.

RUN CONDITIONS:

THE CHILLED WATER SYSTEM SHALL BE ENABLED BY THE BAS TO RUN WHENEVER:

- THE MAIN DISTRIBUTION SYSTEM IS ENABLED

- AND THE OUTSIDE AIR TEMPERATURE IS GREATER THAN 37°F (ADJ.)

ON A CALL FOR COOLING AT ANY EQUIPMENT FOR MORE THAN THREE MINUTES, THE DDC

CONTROLLER SHALL SEND A SIGNAL TO THE CHILLER THAT MECHANICAL COOLING IS REQUIRED.

A CALL FOR COOLING IS DETERMINED BY ANY COOLING COIL VALVE BEING 30 PERCENT OPEN.

THE CHILLER'S ISOLATION VALVE SHALL BE OPENED, PRIMARY PUMP CALLED FOR AND ONCE

FLOW IS ESTABLISHED THE UNIT SHALL BE ENERGIZED AND SHALL RUN A MINIMUM OF 30

MINUTES. THE CHILLER MANUFACTURER'S CONTROL PANEL SHALL MAINTAIN CHILLED WATER

SETPOINT (45°F). AN ANTI-CYCLE TIMER SHALL NOT ALLOW THE CHILLER TO BE STARTED FOR A

PERIOD OF 15 MINUTES AFTER IT SHUTS DOWN BECAUSE OF LOW BUILDING COOLING DEMAND.

THE CHILLER MANUFACTURER'S MINIMUM ON AND OFF TIMES MUST BE OBSERVED. THE ABOVE

SEQUENCE SHALL BE ACCOMPLISHED THROUGH THE BUILDING DDC SYSTEM AND CHILLER

MANUFACTURER'S CONTROL PANEL. ANY OTHER ALARMS OR POINT INFORMATION AS IT RESIDES IN THE CHILLER CONTROL PANEL, SHALL BE AVAILABLE THROUGH THE BUILDING DDC SYSTEM.

PROVIDE A GATEWAY AND PROGRAMMING AS REQUIRED TO RETRIEVE THIS INFORMATION.

ALARMS:

- FAN

FAILURE: COMMANDED ON, BUT THE STATUS IS OFF

IN HAND: COMMANDED OFF, BUT THE STATUS IS ON

RUNTIME EXCEEDED: STATUS RUNTIME EXCEEDS A USER DEFINABLE LIMIT (1,000

HOURS, ADJ. OR MINIMUM MAINTENANCE INTERVAL AS RECOMMENDED BY

EQUIPMENT MANUFACTURER)

- COMPRESSOR

FAILURE: COMMANDED ON, BUT THE STATUS IS OFF

IN HAND: COMMANDED OFF, BUT THE STATUS IS ON

RUNTIME EXCEEDED: STATUS RUNTIME EXCEEDS A USER DEFINABLE LIMIT (1,000

HOURS, ADJ. OR MINIMUM MAINTENANCE INTERVAL AS RECOMMENDED BY

EQUIPMENT MANUFACTURER)

- HIGH CHILLED WATER SUPPLY TEMPERATURE

- LOW CHILLED WATER SUPPLY TEMPERATURE

AHU-1TYPICAL ZONE

CRAC

C W

S

C W

R

OPEN OFFICE/ARTIFACT

STORAGE ROOM 116

(TOWERS PROJECT)

VFD

BO - PUMP ENABLE/DISABLE

BI - PUMP VFD FAULT

BI - PUMP STATUS

AI - PUMP SPEED

CWR

CWS

INCLUDED IN

ACC-1 PACKAGE

M

BO - BYPASS VALVE CONTROL

LOCATED AT CRAC-4 (PROVIDED UNDER SEPARATE PROJECT)

LOCATED IN SOUTH TOWER, FIRST FLOOR. SEE KEYPLAN SHEET

MP101 FOR APPROXIMATE LOCATION.

M

BO - BYPASS VALVE CONTROL

LOCATED AT CRAC-3

V-3

V-2

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BRANDON E. WOOD

Lic. No. 35155

10/15/21

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