H804 - CONTROL DIAGRAMS.pdf

(E)COOLING TOWER #1 (E)COOLING TOWER #2

(E)12"

(E)ISOLATION VALVE

(TYP.)

(E)12"

NOTE:

EXISTING COOLING TOWERS BASED

ON EVAPCO MODEL # USS-112-814

(NOMINAL 600 TONS EACH)

(E)TOWER

PLATFORM

PENETRATION (TYP)

(E)12"

GRADE

(E)AUTOMATIC

FLOW CONTROL

VALVE (TYP)

(E)12"

GRADE

CWP-1

(E)CHECK

VALVE (TYP)

(E)12"

(E)14"

(E)CWR

(E)CWS

(E)12" (E)14"

(E )C

W R (E

)C W

S

(E)CWR

(E)CWS

(E)14"

(E)14"

(E)14"

(E)14"

(E)CWS

(E)10"

(E)CWR

(E)CWS

(E)FLEX.

CONNECTION

(TYP)

DASHED AREA DENOTES

EQUIPMENT/PIPING WITHIN

MACHINERY ROOM

CONDENSER

CONDENSER

EVAPORATOR

EVAPORATOR

CH-2

CHWP-P2

CHWP-S1

CHWP-S2

CH-1

AS-1

(E)10"

(E )C

W R

(E )C

W S

(E)CWR

TC1

ET-1

(E)2"

(E)2" CW MAKE

UP

3-WAY

VALVE,

TYP.

(E)CHWR

(E)CHWS

(E )C

H W

S -P

CWP-2

(E)CHWR(E)CHWR

CHWP-P1

HX-1

(VALVES OPEN FOR FREE COOLING)

(E)FS TT-2

AI

(E)FS

AI

(E)FS

TT-1

AI

(E)FS

AO

(E)FS

V-10

DO

V-9

DO

V-12

DO

V-11

DO

V-14

AO

V-15AO

10" CWR

C W

R

A A V8

DO

V-2

DO

V-6

DO

V-5

DO

V-7

DO

V-3

DO

V-8

DO

V-1

DO

(E)6" CHWR

(E)3-WAY VALVE

MASTER CONTROL TC-1

V-13

DO

V-4

DO

TT-3

AI

TT-4

AI

TT-5

AI

(E)FS

OAT-1

V16

AO V17

AO

DATE:

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CHECKED BY:

PROJ. NO:

DRAWING NO:

DRAWING TITLE:

PROJECT NAME:

CLIENT:

418 BEAVER STREET

SEWICKLEY, PA 15143

PH: 412.287.7333

www.aeworks.com

PROFESSIONAL:

COPYRIGHT 2024 BY AE WORKS LTD ALL RIGHTS RESERVED.

SUBMISSION:

CONSTRUCTION BID

DOCUMENTS

AE WORKS®

A u to d e s k D o c s /A

F R

H -0

S h e ri d a n /A

F R

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.r v t

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H804

AA

MJC

AFRH-033

CONTROL DIAGRAMS

AFRH SHERIDAN

RENOVATION

140 ROCK CREEK CHURCH

ROAD, NORTHWEST,

WASHINGTON, DC

ARMED FORCES

RETIREMENT HOME -

WASHINGTON D.C.

11-13-2024

NO DATE REVISION

1 2/12/2025 BID ADDENDUM

V-X VALVE DESIGNATION

TT-X TEMPERATURE TRANSMITTER

HX HEAT EXCHANGER

FS FLOW SWITCH

DO DIGITAL OUTPUT

DI DIGITAL INPUT

CWS CONDENSER WATER PUMP

CWR CONDENSER WATER RETURN

CWP-X CONDENSER WATER PUMP

CHWS CHILLED WATER SUPPLY

CHWR CHILLED WATER RETURN

CHWP-X CHILLED WATER PUMP

CH-X CHILLER

AO ANALOG OUTPUT

AI ANALOG INPUT

SYMBOL DESCRIPTION

MECHANICAL CONTROLS LEGEND

*EXISTING TO REMAIN CONTROL POINTS NOT SHOWN

OUTSIDE AIR TEMPERATURE TRANSMITTER OAT-1

CHWS TO BUILDING (FREE COOLING) TT-5

CWS BACK TO CHILLERS TT-4

CHWS TO CHILLERS TT-3

CHWS FROM CH-2 TT-2

CHWS FROM CH-1 TT-1

CWS BYPASS TO HX-1 (FREE COOLING) V-15

CWR BYPASS TO HX-1 (FREE COOLING) V-14

CHWS FROM CHWP-P1 V-13

CHWR FROM HX-1 (FREE COOLING) V-12

CWR FROM HX-1 (FREE COOLING) V-11

CHWS FROM HX-1 (FREE COOLING) V-10

CWS TO HX-1 (FREE COOLING) V-9

CHWS FROM CH-2 V-8

CWS TO CH-2 V-7

CHWR TO CH-2 V-6

CWR FROM CH-2 V-5

CHWS FROM CH-1 V-4

CWS TO CH-1 V-3

CHWR TO CH-1 V-2

CWR FROM CH-1 V-1

POINT DEVICE

POINT LIST DESIGNTATIONS

PRIMARY-SECONDARY CHILLER SYSTEM CONTROLS

WHEN PRIMARY CHILLED WATER PUMP CHWP-P1 STARTS,

VALVE V-13 OPENS GRADUALLY (AT ADJUSTED RATE).

WHEN CHWP-P1 STOPS, V-13 CLOSES.

WHEN CHWP-P1 STARTS, CONDENSER WATER PUMP CWP-1

STARTS. CHILLER CH-1 STARTS WHEN CONDENSER FLOW

IS SENSED BY IF2 AND CHILLED WATER TEMPERATURE

CONTROLLER TC1.

WITH HOA SWITCH ON AUTOMATIC, ON STOP SIGNAL FROM

FC-1, CHWP-P1 AND CWP-1 WILL, THROUGH TIME DELAY,

CONTINUE TO OPERATE 1 MINUTE (ADJUSTABLE) AFTER

CH-1 IS OFF. WHEN CHILLER SAFETY CONTROL IS RESET,

PUMP CHWP-P1 WILL RESTART AND CHILLER WILL

RESTART THROUGH FLOW SWITCH IF1.

CONTROLS FOR CH-2 ARE SIMILAR.

EXISTING MASTER CONTROL TC1, WITH PROPORTIONAL

PLUS INTEGRAL FEATURE, IN COMMON WATER SUPPLY,

SET FOR 42 DEGREES F, CONTROLS CAPACITY OF BOTH

CHILLERS THROUGH LOW LIMIT CONTROLLERS AT EACH

MACHINE (T-1 AND T-2). THE CAPACITY OF BOTH

OPERATING CHILLERS IS NORMALLY MODULATED IN

UNISON. PROVIDE PROGRAMMING FOR EACH CHILLER TO

PERMIT ADJUSTMENT OF SEQUENCES.

SELECTOR SWITCH S-2 ON LOCAL CONTROL PANEL, WHEN

SET IN AUTOMATIC MODE, SHALL ENABLE CHILLER

SYSTEMS TO OPERATE UNDER AUTOMATIC FLOW

CONTROL AS REQUIRED BY BUILDING CHILLER WATER

FLOW DEMAND AS DESCRIBED BELOW, IN MANUAL MODE,

OPERATOR WILL START AND STOP CHILLER SYSTEMS.

IN AUTOMATIC MODE, SECONDARY PUMPS CHWP-S1 AND

CHWP-S2 OPERATING FLOW CONTROLLER FC1 WILL

OPERATE CHWP-P1 AND CHWP-P2.

THE PRIMARY CHILLED WATER PUMPS WILL BE

CONTROLLED BY THE CHILLER MASTER CONTROLLER. THE

CHILLER MASTER CONTROLLER WILL TIE INTO THE

EXISTING BAS CONTROL PANEL TO PROVIDE RESET

SCHEDULE AND STATUS OF CHILLERS.

THE SECONDARY CHILLED WATER PUMPS WILL OPERATE

IN A LEAD/LAG MANNER WITH THE PUMP HAVING THE

LEAST RUN TIME HOURS BECOMING THE "LEAD" PUMP. THE

SELECTION OF THE LEAD PUMP WILL OCCUR ON A

MONTHLY BASIS, THE LEAD CHILLED WATER PUMP WILL

RUN CONTINUOUSLY. DIFFERENTIAL PRESSURE INSTALLED

ACROSS EACH PUMP WILL CONFIRM THE STATUS (I.E.

ON/OFF) OF EACH PUMP AND TRIGGER THE STARTING OF

THE LAG PUMP SHOULD THE LEAD PUMP FAIL TO PRODUCE

FLOW FOR A CONTINUOUS 30 SECOND PERIOD.

THE ATC WILL PROVIDE START/STOP AND STATUS, PUMP

ALTERATION, ALARMING, AND VFD CONTROL.

THE ATC WILL PROVIDE A PRESSURE SENSOR AT THE END

OF THE CHILLED WATER LOOP TO CONTROL THE VFD'S.

THE VFD'S WILL BE FURNISHED AND INSTALLED BY THE

ATC CONTRACTOR. POWER WIRING WILL BE BY THE

ELECTRICAL CONTRACTOR.

THE REMOTE PRESSURE SENSOR WILL BE LOCATED IN THE

MAIN HEADER IF THE PUMPS RESET THE SETPOINT OF THE

FLOW METER SET POINT (ADJ.). WHENEVER THE DELTA P

IS LOW, THE FLOW WILL RESET THE REQUIRED FLOW

(GPM) UPWARD. ON A HIGH DELTA P, THE REVERSE WILL

OCCUR. WHENEVER THE LEAD CHILLED WATER PUMP IS AT

FULL OUTPUT FOR OVER 15 MINUTES (ADJ.), THE LAG

CHILLED WATER PUMP WILL ENERGIZE.

AN ADJUSTABLE TIME DELAY WILL IMPOSE A 15-MINUTE

DELAY (ADJUSTABLE) BETWEEN SUBSEQUENT STARTS

(AFTER INITIAL PUMP START) AND 5-MINUTE DELAY

BETWEEN SUBSEQUENT STOPS FOLLOWING THE

STARTING OR STOPPING OF ANY PRIMARY PUMP.

LEAD CHILLER IS LOCKED OFF UNTIL MINIMUM FLOW IS

SENSED BY FC-1 AND RETURN WATER TEMPERATURE AT

T4 IS 6 DEGREES F. HIGHER THAN TC-1 SETPOINT

(ADJUSTABLE). T-3 RESET IS ADJUSTABLE, AFTER START

OF LEAD CHILLER, T-3 IS LOCKED OUT OF CIRCUIT AND

WILL NOT PREVENT START OF OTHER CHILLER.

IN THE EVENT OF RESTORATION OF POWER FOLLOWING

FAILURE, DELAY BETWEEN SUBSEQUENT STARTS OF

PRIMARY PUMPS SHALL BE REDUCED TO 1-MINUTE.

SYSTEM LEAD-LAG SELECTOR SWITCH ON LOCAL

CONTROL PANEL WILL ENABLE SELECTION OF OPERATING

SEQUENCE OF CHILLER SYSTEM, 1.2, OR 2,1.

SECONDARY CHILLED WATER PUMPS CHWP-S1 AND CHWP-

S2 ARE STARTED AND STOPPED MANUALLY FROM THE

LOCAL CONTROL PANEL. THEY ARE VARIABLE SPEED

PUMPS WITH SPEED CONTROLLERS FURNISHED BY THE

PUMP MANUFACTURER. BOTH PUMPS START

SIMULTANEOUSLY ON SLOWEST SPEED AND GRADUALLY

SPEED UP IN RESPONSE TO PC1 AND PC2.

PRESSURE DIFFERENTIAL CONTROLLERS, PC1 AND PC2,

LOCATED TO SENSE SUPPLY AND RETURN PRESSURE

WHERE INDICTAED ON PLANS IN DISTRIBUTION PIPING WILL

CONTROL OPERATING PUMPS SPEEDS TO MAINTAIN A

MINIMUM DIFFERENTIAL OF 10 PSI AT EACH CONTROLLER.

PC1 AND PC2 ARE ADJUSTABLE FROM 5 PSI TO 25 PSI. PC1

AND PC2 WILL BE INDUSTRIAL QUALITY 4-20 MA.

REUSE EXISTING AUTOMATIC VALVE CONTROL PANEL.

COOLING TOWER CONTROLS, VALVES, SENSORS, AND

TRANSMITTERS ARE EXISTING TO REMAIN EXCEPT FOR

THE ADDITIONAL CONTROLS FOR FREE COOLING.

GENERAL NOTES:

1. ALL SETPOINTS WILL BE ADJUSTABLE.

2. ALL CONTROLS FOR CHILLED WATER PUMPS,

CONDENSER WATER PUMPS, CHILLERS, COOLING

TOWERS, FLOW SWITCHES, ETC. WILL TIE INTO

EXISTING "SIEMENS APOGEE" BAS CONTROL

SYSTEM.

CONDENSER WATER SYSTEM CONTROLS

ALL COOLING TOWER CONDENSER WATER CONTROLS AND SEQUENCES WILL BE EXISTING TO

REMAIN EXCEPT FOR THE ADDITION OF FREE COOLING BYPASS EXPLAINED ABOVE.

NEW PUMPS TO TIE INTO EXISTING BAS CONTROL SEQUENCES AND REPLACE EXISTING PUMPS.

EMERGENCY REFRIGERANT LEAK EXHAUST

FAN SEQUENCE OF OPERATION

UPON SENSING A REFRIGERANT LEAK AND RECEIVING SIGNAL FROM MONITORING SYSTEM, THE

EXISTING DAMPER WILL MODULATE TO 100% OPEN AND CYCLE THE EXISTING EXHAUST FAN ON.

SHERIDAN CHILLER PLAN - SEQUENCE OF OPERATIONS

WATERSIDE ECONOMIZER (FREE COOLING)

WHEN THE AMBIENT TEMPERATURE IS 48 DEG F (ADJ) AND THE CONDENSER WATER TEMPERATURE IS AT A MINIMUM OF 55 DEG F (ADJ), THE CHILLER OPERATION WILL CHANGE FROM NORMAL OPERATION

TO ECONOMIZER OPERATION UTILIZING THE FREE COOLING HEAT EXCHANGER TO REMOVE HEAT

FROM THE CHILLED WATER BY USING COLD CONDENSER WATER. COOLING TOWER BYPASS VALVE

V-16,17 WILL BYPASS THE COOLING TOWER UNTIL THE CONDENSER WATER IS AT AN ACCEPTABLE

TEMPERATURE FOR THE CHILLER.

ONCE THE CONDENSER WATER SUPPLY TEMPERATURE IS ACCEPTABLE AS SENSED BY THE EXISTING CONDENSER WATER TEMPERATURE TRANSMITTER, BYPASS VALVE V-14,15 WILL FULLY OPEN TO THE

HEAT EXCHANGER AND TEMPERATURE TRANSMITTER TT-4 WILL CONTINUE TO MONITOR THE

INCOMING CONDENSER WATER TEMPERATURE. AUTOMATIC CONTROL VALVE V-11 WILL FULLY OPEN TO ALLOW CONDENSER WATER RETURN BACK TO THE EXISTING COOLING TOWER. ON THE CHILLED WATER SIDE OF THE HEAT EXCHANGER BYPASS VALVE V-8 WILL BE IN THE BYPASS POSITION OPEN TO THE HEAT EXCHANGER. CHILLED WATER ISOLATION VALVE V-10 WILL FULLY OPEN TO ALLOW CHILLED WATER SUPPLY TO THE BUILDING. CHILLED WATER SUPPLY TEMPERATURE TO THE BUILDING WILL BE SENSED BY TEMPERATURE TRANSMITTER TT-5. SUPPLY WATER TEMPERATURE TO THE BUILDING WILL BE MAINTAINED BELOW 60 DEG F (ADJ). ONCE THE CHWS TEMPERATURE EXCEEDS 60 DEG F (ADJ) THE

SYSTEM WILL CHANGE OVER TO MECHANICAL COOLING. ONCE IN MECHANICAL COOLING MODE,

VALVES V-8, V-10, V-11, AND V-15 WILL GO TO THE FULLY CLOSED POSITION TO THE HEAT EXCHANGER, AND VALVES V-1, V-4, V-8, V-15, AND V-5 WILL FULLY OPEN TO THE CHILLER CONDENSER.

NOTES:

OA TEMPERATURE X X AMBIENT TEMPERATURE

FREE COOLING LEAVING TEMP TT-5 X X X X

TOWER BYPASS VALVE V16. V17 X X 3 WAY MODULATING VALVE

FREE COOLING BYPASS V15 X X 3 WAY MODULATING VALVE

BYPASS VALVE V14 X X X 3 WAY MODULATING VALVE

ISOLATION VALVE V13 X X X HX 2-POSITION VALVE

HX ISOLATION VALVE V12 X X X HX 2-POSITION VALVE

HX ISOLATION VALVE V11 X X X HX 2-POSITION VALVE

HX ISOLATION VALVE V10 X X X HX 2-POSITION VALVE

HX ISOLATION VALVE V9 X X X HX 2-POSITION VALVE

VALVE V8 X X X 3 WAY VALVE

VALVE V7 X X X

VALVE V6 X X X

VALVE V5 X X X

VALVE V4 X X X

VALVE V3 X X X

VALVE V2 X X X

VALVE V1 X X X

TC-1 X X X 3 Way Valve

FLOW METER X X

PC-2 X X DP controller in Distribution Piping

PC-1 X X DP controller in Distribution Piping

DPS-1 X X DP at the end of Chilled water loop

DPS-S2 X X Differential Pressure across pump

DPS-S1 X X Differential Pressure across pump

DPS-P2 X X Differential Pressure across pump

DPS-P1 X X Differential Pressure across pump

FLOW SWITCH IF4 X X CH-2 COND FLOW SWITCH

FLOW SWITCH IF3 X X CH-2 EVAP FLOW SWITCH

FLOW SWITCH IF2 X X CH-1 COND FLOW SWITCH

FLOW SWITCH IF1 X X CH-1 EVAP FLOW SWITCH

CWP-2 X X X X X X

CWP-1 X X X X X X

CHWP-S2 VFD X X X X X X X

CHWP-S1 VFD X X X X X X X

CHWP-P2 VFD X X X X X X X

CHWP-P1 VFD X X X X X X X

ENTERING COND. WATER TEMP TT-4 X X X X

LEAVING CHILLED WATER TEMP TT-2 X X X X

LEAVING CHILLED WATER TEMP TT-1 X X X X

ENTERING CHILLED WATER TEMP TT-3 X X X X

CHILLER CONTROL PANEL X X X

SYSTEM POINT DESCRIPTION

INPUT OUTPUT INPUT OUTPUT ALARMS PROGRAMSSHERIDAN CHILLER PLANT

ANALOG DIGITAL SYSTEMS FEATURES

NOTES

SYSTEM POINT LIST

12" = 1'-0"

SHERIDAN FLOW DIAGRAM

12-FEB-25