36C25618U0323-0002008.pdf

SPS-2

AI15

VFD

DO4

AO5

DI9

AI14

DI6DI2

D02DO1

DI1

SUPPLY AIR

PANEL

DDC CONTROL

OUTSIDE AIR

D-1

D-2

V-2

AI8

AO3

T-4

DPS-1

SD-1

DI10

SD-2

NC-SR

SPS-1

T-1

RETURN AIR

DPS-2

FLOWMETER

AI1

F-1

V-1A

V-1B

S C

R

T-3

NC-SR

NC-SR

T-5

10' MIN. BETWEEN

HUMIDIFIER AND

ELEMENT

V-4NC

AI13

AO4

HUMIDIFIER

M.P. STEAM

FROM CENTRAL

PLANT

T-6

SPS-3

DI12

T/H-2

AI2

DI3

AI3

DI4

DI5

AI5

V-3F T

C W

R

AI6

AO1

AI7

AO2

DI7

T

T-2

AI9

AI10

AI11

AI12

DI8

DO3

DI11

AI16

AI17

SUPPLY AIRSPS-4

AI18

AI19

DI13

T-7T

T/H-1

AI4

AI20

NC

NO

L P

S

F-3

F-4

F-2

SEQUENCE OF OPERATION

1. START/STOP CONTROL

1.1. 7E-AHU-7-2 IS NORMALLY STARTED AND STOPPED REMOTELY AT THE ECC. H-O-A SWITCH SHALL BE

KEPT IN THE "AUTO" POSITION. "HAND" AND "OFF" POSITIONS SHALL BE USED ONLY FOR

MAINTENANCE. WHEN FAN RUN STATUS IS PROVEN VIA A CURRENT SENSING RELAY, CONTROL

LOOPS SHALL BE ENERGIZED. STOPPING THE UNIT SHALL DE-ENERGIZE THE CONTROL LOOPS AND ALL VALVES SHALL GO TO THE CLOSED POSITION, THE OUTSIDE AIR DAMPER SHALL CLOSE, AND THE RETURN AIR DAMPER SHALL OPEN. OUTSIDE AIR SHALL BE METERED TO MONITOR AND MAINTAIN CONSTANT MIN. O.A. AIRFLOW BY MODULATING THE RETURN AND OUTSIDE AIR CONTROL DAMPERS.

2. TEMPERATURE CONTROL

2.1. A TEMPERATURE SENSOR IN THE UNIT SUPPLY AIR SHALL TRANSMIT TEMPERATURE CHANGES TO THE ASC. THE ASC SHALL MODULATE THE 2-WAY COOLING COIL VALVE TO MAINTAIN SUPPLY AIR SETPOINT AT 55°F (ADJUSTABLE). A TEMPERATURE SENSOR IN THE PREHEAT COIL DISCHARGE

SHALL TRANSMIT TEMPERATURE CHANGES TO THE ASC. THE ASC SHALL MODULATE THE 2-WAY

STEAM VALVE PREHEAT COIL VALVE TO MAINTAIN PREHEAT SETPOINT (ADJUSTABLE).

3. DEHUMIDIFICATION CONTROL

3.1. HUMIDITY SENSOR, (1% ACCURACY), SHALL MEASURE RETURN AIR HUMIDITY AT THE AHU. THE BAS

SHALL AVERAGE THE POSITION OF THE VAV BOX AIR VALVES AND SHALL ADJUST THE AIR

TEMPERATURE UPWARD OR DOWNWARD TO MAXIMIZE THE SUPPLY AIR TEMPERATURE THAT SHALL

ALLOW FOR THE MOST EFFICIENT (HIGHEST) SUPPLY AIR TEMPERATURE TO SATISFY VAV BOX

OPERATION DURING THE OCCUPIED PERIOD OF OPERATION. IF THE RETURN AIR HUMIDITY RISES TO 60% (NOMINAL, ADJUSTABLE), THE SUPPLY AIR TEMPERATURE OF THE AHU SHALL BE LIMITED (LOWERED) SO AS TO KEEP THE RETURN AIR HUMIDITY AT OR BELOW 60% (ADJUSTABLE). ALSO, SYSTEM SHALL UTILIZE CALCULATED R.A. DEWPOINT TEMPERATURE TO COMPARE WITH A MAX.

DEWPOINT SETPOINT OF 55°F (ADJUSTABLE). IN ADDITION TO HUMIDITY, TO OVERRIDE CHW VALVE

FOR DEHUMIDIFICATION.

4. HUMIDIFICATION CONTROL

4.1. RETURN AIR HUMIDITY SHALL BE MONITORED. HUMIDIFIER STEAM VALVE SHALL MODULATE TO SUPPLY STEAM TO AHU MOUNTED DIRECT-INJECTION STEAM MANIFOLD REQUIRED TO MAINTAIN THE RETURN AIR RELATIVE HUMIDITY SETPOINT OF 30% (ADJUSTABLE AT ECC) AS SENSED BY THE

RETURN RELATIVE HUMIDITY SENSOR. PRIOR TO ACTIVATION OF MODULATING STEAM CONTROL

VALVE, THE ON/OFF CONTROL VALVE SHALL BE ENABLED THROUGH ECC AND JACKET

TEMPERATURE SENSED BY HIGH TEMPERATURE SENSOR SHALL BE WARM ENOUGH TO PREVENT

CONDENSATION. THE HIGH LIMIT HUMIDITY SENSOR, LOCATED IN THE SUPPLY AIR DUCT 10' AWAY FROM THE HUMIDIFIER, SHALL DISBALE THE HUMIDIFIER AND GIVE AN ALARM SIGNAL TO THE ECC, IF THE SUPPLY AIR HUMIDITY EXCEEDS 85% RH (ADJUSTABLE). THE AIRFLOW SWITCH SHALL PROVE

AIRFLOW BEFORE HUMIDITY CONTROLS ARE ACTIVATED. NORMALLY CLOSED HUMIDIFIER STEAM

SUPPLY VALVES SHALL OPEN WHEN OUTSIDE AIR TEMPERATURE DROPS BELOW 60°F AND SHALL

CLOSE ABOVE 62°F OUTSIDE AIR TEMPERATURE OR WHEN SUPPLY FAN IS OFF. TEMPERATURE

SWITCH SHALL KEEP HUMIDIFIER VALVE CLOSED UNTIL CONDENSATE DRIP LEG REACHES

OPERATING TEMPERATURE.

5. STATIC PRESSURE AND AIRFLOW CONTROL

5.1. THE SUPPLY AIR FAN FLOW SHALL BE CONTROLLED BY THE DIGITAL CONTROL PANEL MODULATING FAN'S INDIVIDUAL ADJUSTABLE SPEED MOTOR CONTROLLER TO MAINTAIN 1.0" OF DUCT STATIC PRESSURE (FIELD ADJUSTABLE), AS SENSED BY THE DUCT STATIC PRESSURE SENSOR LOCATED AT

4 DISTANCE DOWN LONGEST DUCT MAIN. RESET STATIC PRESSURE BASED ON ACTUAL BUILDING

LOAD BY POLLING ALL VAV TERMINAL UNITS.

5.2. FILTER STATUS SHALL BE MONITORED AT EACH PRE-FILTER AND AFTER-FILTER BANK.

AMBIENT AIR SENSOR

INSTALLED ON NORTH

SIDE OF BUILDING

T T T T

T

SUPPLY

FAN

CLG

COIL

HTG

COIL

OUTSIDE AIR FLOWMETER (F-1)

RETURN AIR FLOWMETER (F-2)

HEATING COIL STEAM CONTROL VALVE (V-1B)

HEATING COIL DISCHARGE AIR TEMPERATURE SENSOR (T-4)

LOCAL DDC CONTROLLER

AI2

AI9

AI8

AI1

AI4

AI5

AI6

AI7

RETURN AIR TEMPERATURE SENSOR (T/H-1)AI3

RETURN AIR HUMIDITY SENSOR (T/H-1)

RETURN AIR STATIC PRESSURE SENSOR (SPS-1)

MIXED AIR TEMPERATURE SENSOR (T-2)

HEATING COIL STEAM CONTROL VALVE (V-1A)

AIR PRE-FILTER STATUS (DPS-1)

DI1

RETURN AIR HIGH LIMIT TEMPERATURE SENSOR (T-1) STATUS

AIR FILTER STATUS (DPS-2)

OUTSIDE AIR DAMPER (D-1) STATUS

DI2 RETURN AIR DAMPER (D-2) STATUS

DI3

DI4

DI5

DO1

AO1

AO2

AO3 CHILLED WATER CONTROL VALVE (V-2)

HEATING COIL STEAM CONTROL VALVE (V-1A)

HEATING COIL STEAM CONTROL VALVE (V-1B)

OUTSIDE AIR DAMPER (D-1)

DO2 RETURN AIR DAMPER (D-2) STATUS

SUPPLY FAN STATUS

DI6

SUPPLY DISCHARGE AIR HIGH LIMIT STATIC PRESSURE SENSOR (SPS-3) STATUS

RETURN AIR SMOKE DETECTOR (SD-1) STATUS

DI7

HUMIDIFIER ON/OFF STEAM CONTROL VALVE (V-3) STATUSDI8

DI9

DI10

DI12

HEATING COIL DISCHARGE AIR LOW LIMIT TEMPERATURE SENSOR (T-3) STATUS

AO4

AO5 SUPPLY FAN VFD SPEED

HUMIDIFIER STEAM CONTROL VALVE (V-4)

DO3 HUMIDIFIER ON/OFF STEAM CONTROL VALVE (V-3)

SUPPLY DISCHARGE AIR SMOKE DETECTOR (SD-2)

SUPPLY DISCHARGE AIR STATIC PRESSURE SENSOR (SPS-2)

SUPPLY DISCHARGE AIR TEMPERATURE SENSOR (T/H-2)AI16

AI15

AI11

AI12

AI13

AI14

COOLING COIL CHILLED WATER FLOWMETERAI10

CHILLED WATER CONTROL VALVE (V-2)

COOLING COIL DISCHARGE AIR TEMPERATURE SENSOR (T-5)

HUMIDIFIER STEAM CONTROL VALVE (V-4)

SUPPLY FAN VFD STATUS

AIR

PRE-

FILTER

AIR

FILTER

ZONE 1 SUPPLY AIR FLOWMETER (F-3)

AMBIENT AIR SENSOR (T-7)AI20

AI19

AI17

AI18

SUPPLY DISCHARGE AIR HUMIDITY SENSOR (T/H-2)

ZONE 2 SUPPLY AIR FLOWMETER (F-4)

DI11 SUPPLY DISCHARGE AIR HIGH LIMIT TEMPERATURE SENSOR (T-6) STATUS

DO4 SUPPLY FAN START/STOP

6. FREEZE PROTECTION

6.1. IF THE AIR TEMPERATURE AS SENSED BY PREHEATED MIXED AIR SENSOR (FREEZESTAT) UPSTREAM OF COOLING COIL FALLS BELOW 45°F, AN ALARM SIGNAL SHALL INDICATE AT THE DIGITAL CONTROL PANEL AND ECC. IF THIS TEMPERATURE FALLS BELOW 40°F, AS SENSED BY THE LOW TEMPERATURE SWITCH, THE SUPPLY FAN SHALL SHUT DOWN AND A CRITICAL ALARM SHALL INDICATE AT THE DIGITAL CONTROL PANEL AND ECC. THE LOW TEMPERATURE SWITCH SHALL BE HARDWIRED TO THE

SUPPLY FAN VFD, AND THE UNIT SHALL BE SHUTDOWN IN HAND, AUTO, OR BYPASS MODE

WHENEVER THERE IS A LOW TEMPERATURE ALARM. THE LOW TEMPERATURE SWITCH SHALL

REQUIRE MANUAL RESET AT THE DEVICE.

7. HIGH DUCT STATIC PROTECTION

7.1. A DUCT HIGH PRESSURE SENSOR LOCATED AT THE SUPPLY FAN DISCHARGE SHALL PREVENT THE SUPPLY FAN FROM DEVELOPING OVER 3" OF STATIC PRESSURE (FIELD ADJUSTABLE) IN THE SUPPLY DUCT. IF STATIC PRESSURE DOES EXCEED SET LIMIT, THE SUPPLY FAN SHALL STOP. DUCT HIGH

PRESSURE SENSOR SHALL BE HARDWIRED TO THE SUPPLY FAN VFD AND THE UNIT SHALL BE

SHUTDOWN IN HAND, AUTO OR BYPASS MODE WHENEVER THERE IS A HIGH DUCT PRESSURE ALARM.

THE DUCT HIGH STATIC PRESSURE SENSOR SHALL REQUIRE MANUAL RESET AT DEVICE.

8. SMOKE PROTECTION AND AUTOMATIC SHUTDOWN/RESTART

8.1. A SUPPLY AIR SMOKE DETECTOR IN THE SUPPLY AIR DUCT SHALL STOP THE UNIT AND TRANSMIT A

SIGNAL TO FIRE ALARM SYSTEM UPON DETECTION OF PRODUCTS OF COMBUSTION IN THE DUCT

AND CLOSE THE UNIT ISOLATION SMOKE DAMPERS LOCATED IN SUPPLY AND RETURN DUCT MAINS ADJACENT TO THE UNIT. RE: ELECTRICAL FOR ADDITIONAL REQUIREMENTS. EXHAUST FANS SERVING THE AREA OF THE SUPPLY FAN SHALL CONTINUE TO RUN. THE SUPPLY FAN SHALL RESTART AND

SMOKE DAMPERS SHALL OPEN WHEN FIRE ALARM IS RESET.

8.2. FIRESTATS SHALL BE PROVIDED FOR ANY FAN HANDLING 600CFM OR MORE. FIRESTATS SHALL STOP

ASSOCIATED FAN ON A RISE IN AIR TEMPERATURE ABOVE 125°F.

9. EMERGENCY CONSTANT SPEED OPERATION

9.1. UPON FAILURE OF VFD, THE SUPPLY FAN SHALL BE STARTED/STOPPED MANUALLY AT THE DDC OR

THE ECC THROUGH THE BYPASS STARTER. FANS SHALL THEN BE OPERATED AT CONSTANT SPEED.

F E

D C

B G

Alexandria, Louisiana

A&E Design - Upgrade Energy Management Control Systems

October 30, 2013

VA256-12-C-0253

VETERANS HEALTH CARE

SYSTEM

Alexandria, LA

A

U.S. Department of Veterans Affairs

ZONE 2 SUPPLY AIR HIGH LIMIT STATIC PRESSURE SENSOR (SPS-4) STATUSDI13

AHU 7-2 CONTROL SCHEMATIC

& SEQUENCE

7 EXPANSION WLP NMT

M7-400

NOTES;

1. THESE DRAWINGS ARE REPRESENTATIVE OF THE DESIGN DRAWINGS FOR THE BUILDING 7

EXPANSION CURRENTLY ON GOING AND ARE FOR REFERENCE ONLY.

2. ALL EQUIPMENT IN THIS PROJECT WILL BE CONTROLLED BY THE CAMPUS SIEMENS SYSTEM.

MIGRATE ALL CONTROLS TO NEW SERVER.

10-30-13

AI14

VFD

DO4

AO5

DI9

AI13

DI6DI2

D02DO1

DI1

SUPPLY AIR

PANEL

DDC CONTROL

D-1

D-2

COIL

CLG

V-2

AO3

T-4

SD-1

DI10

SD-2

NC-SR

SPS-1

T-1

AI1

V-1

S C

R

T-3

NC-SR

T-5

10' MIN. BETWEEN

HUMIDIFIER AND

ELEMENT

V-4NC

AI12

AO4

HUMIDIFIER

M .P

S

T E

A M

F R

O M

C E

N T

R A

L P

L A

N T

T-6

SPS-3

DI12

T/H-2

AI2

DI3

AI3

DI4

DI5

AI5

V-3

C W

R

AI6

AO1

AI7 DI7

AI8

AI9

AI10

AI11

DI8

DO3

DI11

AI15

AI16

F-3

F-4

SPS-4

AI17

DI13

T/H-1

AI4

AI18

L P

S

F-2

SEQUENCE OF OPERATION

1. START/STOP CONTROL

1.1. 7E-AHU-7-3 IS NORMALLY STARTED AND STOPPED REMOTELY AT THE ECC. H-O-A SWITCH SHALL BE

KEPT IN THE "AUTO" POSITION. "HAND" AND "OFF" POSITIONS SHALL BE USED ONLY FOR

MAINTENANCE. WHEN FAN RUN STATUS IS PROVEN VIA A CURRENT SENSING RELAY, CONTROL

LOOPS SHALL BE ENERGIZED. STOPPING THE UNIT SHALL DE-ENERGIZE THE CONTROL LOOPS AND ALL VALVES SHALL GO TO THE CLOSED POSITION, THE OUTSIDE AIR DAMPER SHALL CLOSE, AND THE RETURN AIR DAMPER SHALL OPEN. OUTSIDE AIR SHALL BE METERED TO MONITOR AND MAINTAIN CONSTANT MIN. O.A. AIRFLOW BY MODULATING THE RETURN AND OUTSIDE AIR CONTROL DAMPERS.

2. TEMPERATURE CONTROL

2.1. A TEMPERATURE SENSOR IN THE UNIT SUPPLY AIR SHALL TRANSMIT TEMPERATURE CHANGES TO THE ASC. THE ASC SHALL MODULATE THE 2-WAY COOLING COIL VALVE TO MAINTAIN SUPPLY AIR SETPOINT AT 55°F (ADJUSTABLE). A TEMPERATURE SENSOR IN THE PREHEAT COIL DISCHARGE

SHALL TRANSMIT TEMPERATURE CHANGES TO THE ASC. THE ASC SHALL MODULATE THE 2-WAY

STEAM VALVE PREHEAT COIL VALVE TO MAINTAIN PREHEAT SETPOINT (ADJUSTABLE).

3. DEHUMIDIFICATION CONTROL

3.1. HUMIDITY SENSOR, (1% ACCURACY), SHALL MEASURE RETURN AIR HUMIDITY AT THE AHU. THE BAS

SHALL AVERAGE THE POSITION OF THE VAV BOX AIR VALVES AND SHALL ADJUST THE AIR

TEMPERATURE UPWARD OR DOWNWARD TO MAXIMIZE THE SUPPLY AIR TEMPERATURE THAT SHALL

ALLOW FOR THE MOST EFFICIENT (HIGHEST) SUPPLY AIR TEMPERATURE TO SATISFY VAV BOX

OPERATION DURING THE OCCUPIED PERIOD OF OPERATION. IF THE RETURN AIR HUMIDITY RISES TO 60% (NOMINAL, ADJUSTABLE), THE SUPPLY AIR TEMPERATURE OF THE AHU SHALL BE LIMITED (LOWERED) SO AS TO KEEP THE RETURN AIR HUMIDITY AT OR BELOW 60% (ADJUSTABLE). ALSO, SYSTEM SHALL UTILIZE CALCULATED R.A. DEWPOINT TEMPERATURE TO COMPARE WITH A MAX.

DEWPOINT SETPOINT OF 55°F (ADJUSTABLE). IN ADDITION TO HUMIDITY, TO OVERRIDE CHW VALVE

FOR DEHUMIDIFICATION.

4. HUMIDIFICATION CONTROL

4.1. RETURN AIR HUMIDITY SHALL BE MONITORED. HUMIDIFIER STEAM VALVE SHALL MODULATE TO SUPPLY STEAM TO AHU MOUNTED DIRECT-INJECTION STEAM MANIFOLD REQUIRED TO MAINTAIN THE RETURN AIR RELATIVE HUMIDITY SETPOINT OF 30% (ADJUSTABLE AT ECC) AS SENSED BY THE

RETURN RELATIVE HUMIDITY SENSOR. PRIOR TO ACTIVATION OF MODULATING STEAM CONTROL

VALVE, THE ON/OFF CONTROL VALVE SHALL BE ENABLED THROUGH ECC AND JACKET

TEMPERATURE SENSED BY HIGH TEMPERATURE SENSOR SHALL BE WARM ENOUGH TO PREVENT

CONDENSATION. THE HIGH LIMIT HUMIDITY SENSOR, LOCATED IN THE SUPPLY AIR DUCT 10' AWAY FROM THE HUMIDIFIER, SHALL DISBALE THE HUMIDIFIER AND GIVE AN ALARM SIGNAL TO THE ECC, IF THE SUPPLY AIR HUMIDITY EXCEEDS 85% RH (ADJUSTABLE). THE AIRFLOW SWITCH SHALL PROVE

AIRFLOW BEFORE HUMIDITY CONTROLS ARE ACTIVATED. NORMALLY CLOSED HUMIDIFIER STEAM

SUPPLY VALVES SHALL OPEN WHEN OUTSIDE AIR TEMPERATURE DROPS BELOW 60°F AND SHALL

CLOSE ABOVE 62°F OUTSIDE AIR TEMPERATURE OR WHEN SUPPLY FAN IS OFF. TEMPERATURE

SWITCH SHALL KEEP HUMIDIFIER VALVE CLOSED UNTIL CONDENSATE DRIP LEG REACHES

OPERATING TEMPERATURE.

5. STATIC PRESSURE AND AIRFLOW CONTROL

5.1. THE SUPPLY AIR FAN FLOW SHALL BE CONTROLLED BY THE DIGITAL CONTROL PANEL MODULATING FAN'S INDIVIDUAL ADJUSTABLE SPEED MOTOR CONTROLLER TO MAINTAIN 1.0" OF DUCT STATIC PRESSURE (FIELD ADJUSTABLE), AS SENSED BY THE DUCT STATIC PRESSURE SENSOR LOCATED AT

4 DISTANCE DOWN LONGEST DUCT MAIN. RESET STATIC PRESSURE BASED ON ACTUAL BUILDING

LOAD BY POLLING ALL VAV TERMINAL UNITS.

5.2. FILTER STATUS SHALL BE MONITORED AT EACH PRE-FILTER AND AFTER-FILTER BANK.

F E

D C

B G

Alexandria, Louisiana

A&E Design - Upgrade Energy Management Control Systems

October 30, 2013

VA256-12-C-0253

VETERANS HEALTH CARE

SYSTEM

Alexandria, LA

A

U.S. Department of Veterans Affairs

T

OUTSIDE AIR

DPS-1

RETURN AIR

DPS-2

FLOWMETER

F-1

T-2NC

NO

AIR

PRE-

FILTER

AIR

FILTER

T T T T T

HTG

COIL

SUPPLY

FAN

SUPPLY AIR

F T

OUTSIDE AIR FLOWMETER (F-1)

RETURN AIR FLOWMETER (F-2)

HEATING COIL DISCHARGE AIR TEMPERATURE SENSOR (T-4)

LOCAL DDC CONTROLLER

AI2

AI9

AI8

AI1

AI4

AI5

AI6

AI7

RETURN AIR TEMPERATURE SENSOR (T/H-1)AI3

RETURN AIR HUMIDITY SENSOR (T/H-1)

RETURN AIR STATIC PRESSURE SENSOR (SPS-1)

MIXED AIR TEMPERATURE SENSOR (T-2)

HEATING COIL STEAM CONTROL VALVE (V-1)

AIR PRE-FILTER STATUS (DPS-1)

DI1

RETURN AIR HIGH LIMIT TEMPERATURE SENSOR (T-1) STATUS

AIR FILTER STATUS (DPS-2)

OUTSIDE AIR DAMPER (D-1) STATUS

DI2 RETURN AIR DAMPER (D-2) STATUS

DI3

DI4

DI5

SUPPLY FAN STATUS

DI6 RETURN AIR SMOKE DETECTOR (SD-1) STATUS

DI7

HUMIDIFIER ON/OFF STEAM CONTROL VALVE (V-3) STATUSDI8

DI9

DI10

HEATING COIL DISCHARGE AIR LOW LIMIT TEMPERATURE SENSOR (T-3) STATUS

SUPPLY DISCHARGE AIR SMOKE DETECTOR (SD-2)

SUPPLY DISCHARGE AIR STATIC PRESSURE SENSOR (SPS-2)

SUPPLY DISCHARGE AIR TEMPERATURE SENSOR (T/H-2)

AI16

AI15

AI11

AI12

AI13

AI14

COOLING COIL CHILLED WATER FLOWMETER

AI10 CHILLED WATER CONTROL VALVE (V-2)

COOLING COIL DISCHARGE AIR TEMPERATURE SENSOR (T-5)

HUMIDIFIER STEAM CONTROL VALVE (V-4)

SUPPLY FAN VFD STATUS

ZONE 1 SUPPLY AIR FLOWMETER (F-3)

AI17

AI18

SUPPLY DISCHARGE AIR HUMIDITY SENSOR (T/H-2)

ZONE 2 SUPPLY AIR FLOWMETER (F-4)

DI11 SUPPLY DISCHARGE AIR HIGH LIMIT TEMPERATURE SENSOR (T-6) STATUS

DO1

AO1

AO2

AO3 CHILLED WATER CONTROL VALVE (V-2)

HEATING COIL STEAM CONTROL VALVE (V-1A)

HEATING COIL STEAM CONTROL VALVE (V-1B)

OUTSIDE AIR DAMPER (D-1)

DO2 RETURN AIR DAMPER (D-2) STATUS

AO4

AO5 SUPPLY FAN VFD SPEED

HUMIDIFIER STEAM CONTROL VALVE (V-4)

DO3 HUMIDIFIER ON/OFF STEAM CONTROL VALVE (V-3)

DO4 SUPPLY FAN START/STOP

ZONE 2 SUPPLY AIR HIGH LIMIT STATIC PRESSURE SENSOR (SPS-4) STATUSDI13

SUPPLY DISCHARGE AIR HIGH LIMIT STATIC PRESSURE SENSOR (SPS-3) STATUSDI12

6. FREEZE PROTECTION

6.1. IF THE AIR TEMPERATURE AS SENSED BY PREHEATED MIXED AIR SENSOR (FREEZESTAT) UPSTREAM OF COOLING COIL FALLS BELOW 45°F, AN ALARM SIGNAL SHALL INDICATE AT THE DIGITAL CONTROL PANEL AND ECC. IF THIS TEMPERATURE FALLS BELOW 40°F, AS SENSED BY THE LOW TEMPERATURE SWITCH, THE SUPPLY FAN SHALL SHUT DOWN AND A CRITICAL ALARM SHALL INDICATE AT THE DIGITAL CONTROL PANEL AND ECC. THE LOW TEMPERATURE SWITCH SHALL BE HARDWIRED TO THE

SUPPLY FAN VFD, AND THE UNIT SHALL BE SHUTDOWN IN HAND, AUTO, OR BYPASS MODE

WHENEVER THERE IS A LOW TEMPERATURE ALARM. THE LOW TEMPERATURE SWITCH SHALL

REQUIRE MANUAL RESET AT THE DEVICE.

7. HIGH DUCT STATIC PROTECTION

7.1. A DUCT HIGH PRESSURE SENSOR LOCATED AT THE SUPPLY FAN DISCHARGE SHALL PREVENT THE SUPPLY FAN FROM DEVELOPING OVER 3" OF STATIC PRESSURE (FIELD ADJUSTABLE) IN THE SUPPLY DUCT. IF STATIC PRESSURE DOES EXCEED SET LIMIT, THE SUPPLY FAN SHALL STOP. DUCT HIGH

PRESSURE SENSOR SHALL BE HARDWIRED TO THE SUPPLY FAN VFD AND THE UNIT SHALL BE

SHUTDOWN IN HAND, AUTO OR BYPASS MODE WHENEVER THERE IS A HIGH DUCT PRESSURE ALARM.

THE DUCT HIGH STATIC PRESSURE SENSOR SHALL REQUIRE MANUAL RESET AT DEVICE.

8. SMOKE PROTECTION AND AUTOMATIC SHUTDOWN/RESTART

8.1. A SUPPLY AIR SMOKE DETECTOR IN THE SUPPLY AIR DUCT SHALL STOP THE UNIT AND TRANSMIT A

SIGNAL TO FIRE ALARM SYSTEM UPON DETECTION OF PRODUCTS OF COMBUSTION IN THE DUCT

AND CLOSE THE UNIT ISOLATION SMOKE DAMPERS LOCATED IN SUPPLY AND RETURN DUCT MAINS ADJACENT TO THE UNIT. RE: ELECTRICAL FOR ADDITIONAL REQUIREMENTS. EXHAUST FANS SERVING THE AREA OF THE SUPPLY FAN SHALL CONTINUE TO RUN. THE SUPPLY FAN SHALL RESTART AND

SMOKE DAMPERS SHALL OPEN WHEN FIRE ALARM IS RESET.

8.2. FIRESTATS SHALL BE PROVIDED FOR ANY FAN HANDLING 600CFM OR MORE. FIRESTATS SHALL STOP

ASSOCIATED FAN ON A RISE IN AIR TEMPERATURE ABOVE 125°F.

9. EMERGENCY CONSTANT SPEED OPERATION

9.1. UPON FAILURE OF VFD, THE SUPPLY FAN SHALL BE STARTED/STOPPED MANUALLY AT THE DDC OR

THE ECC THROUGH THE BYPASS STARTER. FANS SHALL THEN BE OPERATED AT CONSTANT SPEED.

AHU 7-3 CONTROL SCHEMATIC

& SEQUENCE

7 EXPANSION WLP NMT

M7-401

NOTES;

1. THESE DRAWINGS ARE REPRESENTATIVE OF THE DESIGN DRAWINGS FOR THE BUILDING 7

EXPANSION CURRENTLY ON GOING AND ARE FOR REFERENCE ONLY.

2. ALL EQUIPMENT IN THIS PROJECT WILL BE CONTROLLED BY THE CAMPUS SIEMENS SYSTEM.

AI17

DO6

AO6

DI11

AI16

DI2

D02

DO1

DI1

PANEL

DDC CONTROL

OUTSIDE AIR

D-2

D-3

V-2

AO4

T-4

SD-1

DI12

SD-2

NC-SR

SPS-1

T

T-1

RETURN AIR

FLOWMETER

AI1

F-1

S C

R

T-3

T-5

10' MIN. BETWEEN

HUMIDIFIER AND

ELEMENT

V-4NC

AI15

AO5

HUMIDIFIER T-6

SPS-3

DI14

T/H-2

AI2

DI4

DI6

DI7

V-3

C W

R

DI9

T-2

AI11

AI12

AI13

AI14

DI10

DO5

DI13

AI18

AI19

SUPPLY AIR

F-3

SPS-4

DI15

T/H-1

NC

NO

AI20AI6 AI9

V-1A

AI7

AO2

AI8

AO3

D-1

NC

F-2

DO3

DI3

DO4

AO1

DI5

AI3 AI4

AI5

DI8

AI10

L P

S

CLEAN STEAM

GENERATOR

L P

C L E

A N

S T

E A

M

EXHAUST AIR

F-4

SEQUENCE OF OPERATION

1. START/STOP CONTROL

1.1. 7E-AHU-7-AC102 IS NORMALLY STARTED AND STOPPED REMOTELY AT THE ECC. H-O-A SWITCH SHALL BE KEPT IN THE "AUTO" POSITION. "HAND" AND "OFF" POSITIONS SHALL BE USED ONLY FOR MAINTENANCE.

WHEN FAN RUN STATUS IS PROVEN VIA A CURRENT SENSING RELAY, CONTROL LOOPS SHALL BE ENERGIZED. STOPPING THE UNIT SHALL DE-ENERGIZE THE CONTROL LOOPS AND ALL VALVES SHALL GO TO THE CLOSED POSITION, THE OUTSIDE AIR DAMPER SHALL CLOSE, AND THE RETURN AIR DAMPER SHALL OPEN. OUTSIDE AIR SHALL BE METERED TO MONITOR AND MAINTAIN CONSTANT MIN. O.A.

AIRFLOW BY MODULATING THE RETURN AND OUTSIDE AIR CONTROL DAMPERS.

2. TEMPERATURE CONTROL

2.1. A TEMPERATURE SENSOR IN THE UNIT SUPPLY AIR SHALL TRANSMIT TEMPERATURE CHANGES TO THE ASC. THE ASC SHALL MODULATE THE 2-WAY COOLING COIL VALVE TO MAINTAIN SUPPLY AIR SETPOINT AT 55°F (ADJUSTABLE). A TEMPERATURE SENSOR IN THE PREHEAT COIL DISCHARGE SHALL TRANSMIT TEMPERATURE CHANGES TO THE ASC. THE ASC SHALL MODULATE THE 2-WAY STEAM VALVE PREHEAT

COIL VALVE TO MAINTAIN PREHEAT SETPOINT (ADJUSTABLE).

3. DEHUMIDIFICATION CONTROL

3.1. HUMIDITY SENSOR, (1% ACCURACY), SHALL MEASURE RETURN AIR HUMIDITY AT THE AHU. THE BAS

SHALL AVERAGE THE POSITION OF THE VAV BOX AIR VALVES AND SHALL ADJUST THE AIR

TEMPERATURE UPWARD OR DOWNWARD TO MAXIMIZE THE SUPPLY AIR TEMPERATURE THAT SHALL

ALLOW FOR THE MOST EFFICIENT (HIGHEST) SUPPLY AIR TEMPERATURE TO SATISFY VAV BOX

OPERATION DURING THE OCCUPIED PERIOD OF OPERATION. IF THE RETURN AIR HUMIDITY RISES TO 60% (NOMINAL, ADJUSTABLE), THE SUPPLY AIR TEMPERATURE OF THE AHU SHALL BE LIMITED (LOWERED) SO AS TO KEEP THE RETURN AIR HUMIDITY AT OR BELOW 60% (ADJUSTABLE). ALSO, SYSTEM SHALL UTILIZE CALCULATED R.A. DEWPOINT TEMPERATURE TO COMPARE WITH A MAX.

DEWPOINT SETPOINT OF 55°F (ADJUSTABLE). IN ADDITION TO HUMIDITY, TO OVERRIDE CHW VALVE FOR

DEHUMIDIFICATION.

4. HUMIDIFICATION CONTROL

4.1. RETURN AIR HUMIDITY SHALL BE MONITORED. HUMIDIFIER STEAM VALVE SHALL MODULATE TO SUPPLY STEAM TO AHU MOUNTED DIRECT-INJECTION STEAM MANIFOLD REQUIRED TO MAINTAIN THE RETURN AIR RELATIVE HUMIDITY SETPOINT OF 30% (ADJUSTABLE AT ECC) AS SENSED BY THE RETURN RELATIVE HUMIDITY SENSOR. PRIOR TO ACTIVATION OF MODULATING STEAM CONTROL VALVE, THE ON/OFF

CONTROL VALVE SHALL BE ENABLED THROUGH ECC AND JACKET TEMPERATURE SENSED BY HIGH

TEMPERATURE SENSOR SHALL BE WARM ENOUGH TO PREVENT CONDENSATION. THE HIGH LIMIT

HUMIDITY SENSOR, LOCATED IN THE SUPPLY AIR DUCT 10' AWAY FROM THE HUMIDIFIER, SHALL DISBALE THE HUMIDIFIER AND GIVE AN ALARM SIGNAL TO THE ECC, IF THE SUPPLY AIR HUMIDITY EXCEEDS 85% RH (ADJUSTABLE). THE AIRFLOW SWITCH SHALL PROVE AIRFLOW BEFORE HUMIDITY CONTROLS ARE ACTIVATED. NORMALLY CLOSED HUMIDIFIER STEAM SUPPLY VALVES SHALL OPEN WHEN OUTSIDE AIR TEMPERATURE DROPS BELOW 60°F AND SHALL CLOSE ABOVE 62°F OUTSIDE AIR TEMPERATURE OR WHEN SUPPLY FAN IS OFF. TEMPERATURE SWITCH SHALL KEEP HUMIDIFIER VALVE CLOSED UNTIL

CONDENSATE DRIP LEG REACHES OPERATING TEMPERATURE.

5. STATIC PRESSURE AND AIRFLOW CONTROL

5.1. THE SUPPLY AIR FAN FLOW SHALL BE CONTROLLED BY THE DIGITAL CONTROL PANEL MODULATING FAN'S INDIVIDUAL ADJUSTABLE SPEED MOTOR CONTROLLER TO MAINTAIN 1.0" OF DUCT STATIC PRESSURE (FIELD ADJUSTABLE), AS SENSED BY THE DUCT STATIC PRESSURE SENSOR LOCATED AT 3

DISTANCE DOWN LONGEST DUCT MAIN. RESET STATIC PRESSURE BASED ON ACTUAL BUILDING LOAD

BY POLLING ALL VAV TERMINAL UNITS.

5.2. FILTER STATUS SHALL BE MONITORED AT EACH PRE-FILTER AND AFTER-FILTER BANK.

F E

D C

B G

Alexandria, Louisiana

A&E Design - Upgrade Energy Management Control Systems

October 30, 2013

VA256-12-C-0253

VETERANS HEALTH CARE

SYSTEM

Alexandria, LA

A

U.S. Department of Veterans Affairs

RETURN

FAN

HTG

COIL

CLG

COIL

SUPPLY

FAN

DPS-1 DPS-2

AIR

PRE-

FILTER

AIR

FILTER

VFD

VFD

TTTTT

F T

V-1B

NC-SR

NC-SR

M.P. STEAM

FROM CENTRAL

PLANT

OUTSIDE AIR FLOWMETER (F-1)

RETURN AIR DISCHARGE FLOWMETER (F-2)

HEATING COIL STEAM CONTROL VALVE (V-1B)

HEATING COIL DISCHARGE AIR TEMPERATURE SENSOR (T-4)

LOCAL DDC CONTROLLER

AI2

AI9

AI8

AI1

AI4

AI5

AI6

AI7

RETURN AIR TEMPERATURE SENSOR (T/H-1)

AI3

RETURN AIR HUMIDITY SENSOR (T/H-1)

RETURN AIR STATIC PRESSURE SENSOR (SPS-1)

MIXED AIR TEMPERATURE SENSOR (T-2)

HEATING COIL STEAM CONTROL VALVE (V-1A)

RETURN AIR DAMPER (D-3) STATUS

DI1

AIR PRE-FILTER STATUS (DPS-1)

AIR FILTER STATUS (DPS-2)

EXHAUST AIR DAMPER (D-1) STATUS

DI2 OUTSIDE AIR DAMPER (D-2) STATUS

DI3

DI4

DI5

DO1

AO1

AO2

AO3 HEATING COIL STEAM CONTROL VALVE (V-1B)

RETURN FAN VFD SPEED

HEATING COIL STEAM CONTROL VALVE (V-1A)

EXHAUST AIR DAMPER (D-1)

DO2 OUTSIDE AIR DAMPER (D-2)

HUMIDIFIER ON/OFF STEAM CONTROL VALVE (V-3) STATUS

DI6

SUPPLY DISCHARGE AIR HIGH LIMIT TEMPERATURE SENSOR (T-6) STATUS

RETURN AIR SMOKE DETECTOR (SD-1) STATUS

DI7

DI8

DI9

DI10

DI12

HEATING COIL DISCHARGE AIR LOW LIMIT TEMPERATURE SENSOR (T-3) STATUS

AO4

AO5 HUMIDIFIER STEAM CONTROL VALVE (V-4)

CHILLED WATER CONTROL VALVE (V-2)

DO3 RETURN AIR DAMPER (D-3)

SUPPLY FAN STATUS

SUPPLY DISCHARGE AIR STATIC PRESSURE SENSOR (SPS-2)

SUPPLY DISCHARGE AIR TEMPERATURE SENSOR (T/H-2)

AI16

AI15

AI11

AI12

AI13

AI14

COOLING COIL CHILLED WATER FLOWMETER

AI10

CHILLED WATER CONTROL VALVE (V-2)

COOLING COIL DISCHARGE AIR TEMPERATURE SENSOR (T-5)

HUMIDIFIER STEAM CONTROL VALVE (V-4)

SUPPLY FAN VFD STATUS

SUPPLY DISCHARGE AIR FLOWMETER (F-4)AI20

AI19

AI17

AI18

SUPPLY DISCHARGE AIR HUMIDITY SENSOR (T/H-2)

DI11

SUPPLY DISCHARGE AIR SMOKE DETECTOR (SD-2)

DO4 RETURN FAN START/STOP

SUPPLY DISCHARGE AIR HIGH LIMIT STATIC PRESSURE SENSOR (SPS-3) STATUS

DI13

DO5 HUMIDIFIER ON/OFF STEAM CONTROL VALVE (V-3)

DI14

DO6 SUPPLY FAN START/STOP

AO6 SUPPLY FAN VFD SPEED

RETURN FAN STATUS

SUPPLY AIR HIGH LIMIT STATIC PRESSURE SENSOR (SPS-4) STATUSDI15

RETURN AIR HIGH LIMIT TEMPERATURE SENSOR (T-1) STATUS

RETURN AIR INTAKE FLOWMETER (F-3)

RETURN FAN VFD STATUS

6. FREEZE PROTECTION

6.1. IF THE AIR TEMPERATURE AS SENSED BY PREHEATED MIXED AIR SENSOR (FREEZESTAT) UPSTREAM OF COOLING COIL FALLS BELOW 45°F, AN ALARM SIGNAL SHALL INDICATE AT THE DIGITAL CONTROL PANEL AND ECC. IF THIS TEMPERATURE FALLS BELOW 40°F, AS SENSED BY THE LOW TEMPERATURE SWITCH, THE SUPPLY FAN SHALL SHUT DOWN AND A CRITICAL ALARM SHALL INDICATE AT THE DIGITAL CONTROL PANEL AND ECC. THE LOW TEMPERATURE SWITCH SHALL BE HARDWIRED TO THE SUPPLY FAN VFD, AND THE UNIT SHALL BE SHUTDOWN IN HAND, AUTO, OR BYPASS MODE WHENEVER THERE IS A LOW

TEMPERATURE ALARM. THE LOW TEMPERATURE SWITCH SHALL REQUIRE MANUAL RESET AT THE

DEVICE.

7. HIGH DUCT STATIC PROTECTION

7.1. A DUCT HIGH PRESSURE SENSOR LOCATED AT THE SUPPLY FAN DISCHARGE SHALL PREVENT THE SUPPLY FAN FROM DEVELOPING OVER 3" OF STATIC PRESSURE (FIELD ADJUSTABLE) IN THE SUPPLY DUCT. IF STATIC PRESSURE DOES EXCEED SET LIMIT, THE SUPPLY FAN SHALL STOP. DUCT HIGH

PRESSURE SENSOR SHALL BE HARDWIRED TO THE SUPPLY FAN VFD AND THE UNIT SHALL BE

SHUTDOWN IN HAND, AUTO OR BYPASS MODE WHENEVER THERE IS A HIGH DUCT PRESSURE ALARM.

THE DUCT HIGH STATIC PRESSURE SENSOR SHALL REQUIRE MANUAL RESET AT DEVICE.

8. SMOKE PROTECTION AND AUTOMATIC SHUTDOWN/RESTART

8.1. A SUPPLY AIR SMOKE DETECTOR IN THE SUPPLY AIR DUCT SHALL STOP THE UNIT AND TRANSMIT A SIGNAL TO FIRE ALARM SYSTEM UPON DETECTION OF PRODUCTS OF COMBUSTION IN THE DUCT AND

CLOSE THE UNIT ISOLATION SMOKE DAMPERS LOCATED IN SUPPLY AND RETURN DUCT MAINS

ADJACENT TO THE UNIT. RE: ELECTRICAL FOR ADDITIONAL REQUIREMENTS. EXHAUST FANS SERVING THE AREA OF THE SUPPLY FAN SHALL CONTINUE TO RUN. THE SUPPLY FAN SHALL RESTART AND

SMOKE DAMPERS SHALL OPEN WHEN FIRE ALARM IS RESET.

8.2. FIRESTATS SHALL BE PROVIDED FOR ANY FAN HANDLING 600CFM OR MORE. FIRESTATS SHALL STOP

ASSOCIATED FAN ON A RISE IN AIR TEMPERATURE ABOVE 125°F.

9. EMERGENCY CONSTANT SPEED OPERATION

9.1. UPON FAILURE OF VFD, THE SUPPLY FAN SHALL BE STARTED/STOPPED MANUALLY AT THE DDC OR THE

ECC THROUGH THE BYPASS STARTER. FANS SHALL THEN BE OPERATED AT CONSTANT SPEED.

AHU 7-AC102 CONTROL SCHEMATIC

& SEQUENCE

7 EXPANSION WLP NMT

M7-402

NOTES;

1. THESE DRAWINGS ARE REPRESENTATIVE OF THE DESIGN DRAWINGS FOR THE BUILDING 7

EXPANSION CURRENTLY ON GOING AND ARE FOR REFERENCE ONLY.

2. ALL EQUIPMENT IN THIS PROJECT WILL BE CONTROLLED BY THE CAMPUS SIEMENS SYSTEM.

AI15

VFD

DO4

AO5

DI9

AI14DI2

D02DO1

DI1

PANEL

DDC CONTROL

OUTSIDE AIR

D-1

D-2

AO3

T-4

DPS-1

SD-1

DI10

SD-2

SPS-1

T-1

DPS-2

FLOWMETER

AI1

F-1 T-3

T-5

10' MIN. BETWEEN

HUMIDIFIER AND

ELEMENT

V-4NC

AI13

AO4

SPS-3

DI12

T/H-2

AI2

DI3 DI4

AI5

DI7

T-2

AI9

AI10

AI11

AI12

DI8

DO3

DI11

AI16

AI17

DI13

T/H-1

NC

NO

AI18DI5 AI8

AI6

AO1

AI7

AO2

AI3

AI4 DI6

T-7T

AI19

F-2

SEQUENCE OF OPERATION

1. START/STOP CONTROL

1.1. 7E-AHU-7-AC103 IS NORMALLY STARTED AND STOPPED REMOTELY AT THE ECC. H-O-A SWITCH SHALL BE KEPT IN THE "AUTO" POSITION. "HAND" AND "OFF" POSITIONS SHALL BE USED ONLY FOR

MAINTENANCE. WHEN FAN RUN STATUS IS PROVEN VIA A CURRENT SENSING RELAY, CONTROL

LOOPS SHALL BE ENERGIZED. STOPPING THE UNIT SHALL DE-ENERGIZE THE CONTROL LOOPS AND ALL VALVES SHALL GO TO THE CLOSED POSITION, THE OUTSIDE AIR DAMPER SHALL CLOSE, AND THE RETURN AIR DAMPER SHALL OPEN. OUTSIDE AIR SHALL BE METERED TO MONITOR AND MAINTAIN CONSTANT MIN. O.A. AIRFLOW BY MODULATING THE RETURN AND OUTSIDE AIR CONTROL DAMPERS.

2. TEMPERATURE CONTROL

2.1. A TEMPERATURE SENSOR IN THE UNIT SUPPLY AIR SHALL TRANSMIT TEMPERATURE CHANGES TO THE ASC. THE ASC SHALL MODULATE THE 2-WAY COOLING COIL VALVE TO MAINTAIN SUPPLY AIR SETPOINT AT 55°F (ADJUSTABLE). A TEMPERATURE SENSOR IN THE PREHEAT COIL DISCHARGE

SHALL TRANSMIT TEMPERATURE CHANGES TO THE ASC. THE ASC SHALL MODULATE THE 2-WAY

STEAM VALVE PREHEAT COIL VALVE TO MAINTAIN PREHEAT SETPOINT (ADJUSTABLE).

3. DEHUMIDIFICATION CONTROL

3.1. HUMIDITY SENSOR, (1% ACCURACY), SHALL MEASURE RETURN AIR HUMIDITY AT THE AHU. THE BAS

SHALL AVERAGE THE POSITION OF THE VAV BOX AIR VALVES AND SHALL ADJUST THE AIR

TEMPERATURE UPWARD OR DOWNWARD TO MAXIMIZE THE SUPPLY AIR TEMPERATURE THAT SHALL

ALLOW FOR THE MOST EFFICIENT (HIGHEST) SUPPLY AIR TEMPERATURE TO SATISFY VAV BOX

OPERATION DURING THE OCCUPIED PERIOD OF OPERATION. IF THE RETURN AIR HUMIDITY RISES TO 60% (NOMINAL, ADJUSTABLE), THE SUPPLY AIR TEMPERATURE OF THE AHU SHALL BE LIMITED (LOWERED) SO AS TO KEEP THE RETURN AIR HUMIDITY AT OR BELOW 60% (ADJUSTABLE). ALSO, SYSTEM SHALL UTILIZE CALCULATED R.A. DEWPOINT TEMPERATURE TO COMPARE WITH A MAX.

DEWPOINT SETPOINT OF 55°F (ADJUSTABLE). IN ADDITION TO HUMIDITY, TO OVERRIDE CHW VALVE

FOR DEHUMIDIFICATION.

4. HUMIDIFICATION CONTROL

4.1. RETURN AIR HUMIDITY SHALL BE MONITORED. HUMIDIFIER STEAM VALVE SHALL MODULATE TO SUPPLY STEAM TO AHU MOUNTED DIRECT-INJECTION STEAM MANIFOLD REQUIRED TO MAINTAIN THE RETURN AIR RELATIVE HUMIDITY SETPOINT OF 30% (ADJUSTABLE AT ECC) AS SENSED BY THE

RETURN RELATIVE HUMIDITY SENSOR. PRIOR TO ACTIVATION OF MODULATING STEAM CONTROL

VALVE, THE ON/OFF CONTROL VALVE SHALL BE ENABLED THROUGH ECC AND JACKET

TEMPERATURE SENSED BY HIGH TEMPERATURE SENSOR SHALL BE WARM ENOUGH TO PREVENT

CONDENSATION. THE HIGH LIMIT HUMIDITY SENSOR, LOCATED IN THE SUPPLY AIR DUCT 10' AWAY FROM THE HUMIDIFIER, SHALL DISBALE THE HUMIDIFIER AND GIVE AN ALARM SIGNAL TO THE ECC, IF THE SUPPLY AIR HUMIDITY EXCEEDS 85% RH (ADJUSTABLE). THE AIRFLOW SWITCH SHALL PROVE

AIRFLOW BEFORE HUMIDITY CONTROLS ARE ACTIVATED. NORMALLY CLOSED HUMIDIFIER STEAM

SUPPLY VALVES SHALL OPEN WHEN OUTSIDE AIR TEMPERATURE DROPS BELOW 60°F AND SHALL

CLOSE ABOVE 62°F OUTSIDE AIR TEMPERATURE OR WHEN SUPPLY FAN IS OFF. TEMPERATURE

SWITCH SHALL KEEP HUMIDIFIER VALVE CLOSED UNTIL CONDENSATE DRIP LEG REACHES

OPERATING TEMPERATURE.

AMBIENT AIR TEMPERATURE

SENSOR INSTALLED ON

NORTH SIDE OF BUILDING

AIR

FILTER

AIR

PRE-

FILTER

T

T T T T

HTG

COIL

CLG

COIL HUMIDIFIER T-6

SUPPLY AIRSPS-4

F-3

SUPPLY

FAN

V-3

L P

S

CLEAN STEAM

GENERATOR

L P

C L E

A N

S T

E A

M

V-2

NC-SR

C W

R

F

TS

C R

V-1A

V-1B

NC-SR

NC-SR

M.P. STEAM

FROM CENTRAL

PLANT

RETURN AIR

T

OUTSIDE AIR FLOWMETER (F-1)

RETURN AIR FLOWMETER (F-2)

HEATING COIL STEAM CONTROL VALVE (V-1B)

HEATING COIL DISCHARGE AIR TEMPERATURE SENSOR (T-4)

LOCAL DDC CONTROLLER

AI2

AI9

AI8

AI1

AI4

AI5

AI6

AI7

RETURN AIR TEMPERATURE SENSOR (T/H-1)AI3

RETURN AIR HUMIDITY SENSOR (T/H-1)

RETURN AIR STATIC PRESSURE SENSOR (SPS-1)

MIXED AIR TEMPERATURE SENSOR (T-2)

HEATING COIL STEAM CONTROL VALVE (V-1A)

RETURN AIR DAMPER (D-2) STATUS

DI1

AIR PRE-FILTER STATUS (DPS-1)

AIR FILTER STATUS (DPS-2)

DI2

OUTSIDE AIR DAMPER (D-1) STATUS

DI3

DI4

DI5

DO1

AO1

AO2

AO3

HEATING COIL STEAM CONTROL VALVE (V-1B)

HEATING COIL STEAM CONTROL VALVE (V-1A)

DO2

OUTSIDE AIR DAMPER (D-1)

HUMIDIFIER ON/OFF STEAM CONTROL VALVE (V-3) STATUS

DI6

SUPPLY DISCHARGE AIR HIGH LIMIT TEMPERATURE SENSOR (T-6) STATUS

RETURN AIR SMOKE DETECTOR (SD-1) STATUS

DI7

DI8

DI9

DI10

DI12

HEATING COIL DISCHARGE AIR LOW LIMIT TEMPERATURE SENSOR (T-3) STATUS

AO4

AO5

HUMIDIFIER STEAM CONTROL VALVE (V-4)

CHILLED WATER CONTROL VALVE (V-2)

DO3

RETURN AIR DAMPER (D-2)

SUPPLY FAN STATUS

SUPPLY DISCHARGE AIR STATIC PRESSURE SENSOR (SPS-2)

SUPPLY DISCHARGE AIR TEMPERATURE SENSOR (T/H-2)AI16

AI15

AI11

AI12

AI13

AI14

COOLING COIL CHILLED WATER FLOWMETERAI10

CHILLED WATER CONTROL VALVE (V-2)

COOLING COIL DISCHARGE AIR TEMPERATURE SENSOR (T-5)

HUMIDIFIER STEAM CONTROL VALVE (V-4)

SUPPLY FAN VFD STATUS

SUPPLY DISCHARGE AIR FLOWMETER (F-3)

AI19

AI17

AI18

SUPPLY DISCHARGE AIR HUMIDITY SENSOR (T/H-2)

DI11

SUPPLY DISCHARGE AIR SMOKE DETECTOR (SD-2)

DO4

SUPPLY DISCHARGE AIR HIGH LIMIT STATIC PRESSURE SENSOR (SPS-3) STATUS

DI13

HUMIDIFIER ON/OFF STEAM CONTROL VALVE (V-3)

SUPPLY FAN START/STOP

SUPPLY FAN VFD SPEED

SUPPLY AIR HIGH LIMIT STATIC PRESSURE SENSOR (SPS-4) STATUS

RETURN AIR HIGH LIMIT TEMPERATURE SENSOR (T-1) STATUS

AMBIENT AIR TEMPERATURE SENSOR (T-7)

F E

D C

B G

Alexandria, Louisiana

A&E Design - Upgrade Energy Management Control Systems

October 30, 2013

VA256-12-C-0253

VETERANS HEALTH CARE

SYSTEM

Alexandria, LA

A

U.S. Department of Veterans Affairs

5. STATIC PRESSURE AND AIRFLOW CONTROL

5.1. THE SUPPLY AIR FAN FLOW SHALL BE CONTROLLED BY THE DIGITAL CONTROL PANEL MODULATING FAN'S INDIVIDUAL ADJUSTABLE SPEED MOTOR CONTROLLER TO MAINTAIN 1.0" OF DUCT STATIC PRESSURE (FIELD ADJUSTABLE), AS SENSED BY THE DUCT STATIC PRESSURE SENSOR LOCATED AT

4 DISTANCE DOWN LONGEST DUCT MAIN. RESET STATIC PRESSURE BASED ON ACTUAL BUILDING

LOAD BY POLLING ALL VAV TERMINAL UNITS.

5.2. FILTER STATUS SHALL BE MONITORED AT EACH PRE-FILTER AND AFTER-FILTER BANK.

6. FREEZE PROTECTION

6.1. IF THE AIR TEMPERATURE AS SENSED BY PREHEATED MIXED AIR SENSOR (FREEZESTAT) UPSTREAM OF COOLING COIL FALLS BELOW 45°F, AN ALARM SIGNAL SHALL INDICATE AT THE DIGITAL CONTROL PANEL AND ECC. IF THIS TEMPERATURE FALLS BELOW 40°F, AS SENSED BY THE LOW TEMPERATURE SWITCH, THE SUPPLY FAN SHALL SHUT DOWN AND A CRITICAL ALARM SHALL INDICATE AT THE DIGITAL CONTROL PANEL AND ECC. THE LOW TEMPERATURE SWITCH SHALL BE HARDWIRED TO THE

SUPPLY FAN VFD, AND THE UNIT SHALL BE SHUTDOWN IN HAND, AUTO, OR BYPASS MODE

WHENEVER THERE IS A LOW TEMPERATURE ALARM. THE LOW TEMPERATURE SWITCH SHALL

REQUIRE MANUAL RESET AT THE DEVICE.

7. HIGH DUCT STATIC PROTECTION

7.1. A DUCT HIGH PRESSURE SENSOR LOCATED AT THE SUPPLY FAN DISCHARGE SHALL PREVENT THE SUPPLY FAN FROM DEVELOPING OVER 3" OF STATIC PRESSURE (FIELD ADJUSTABLE) IN THE SUPPLY DUCT. IF STATIC PRESSURE DOES EXCEED SET LIMIT, THE SUPPLY FAN SHALL STOP. DUCT HIGH

PRESSURE SENSOR SHALL BE HARDWIRED TO THE SUPPLY FAN VFD AND THE UNIT SHALL BE

SHUTDOWN IN HAND, AUTO OR BYPASS MODE WHENEVER THERE IS A HIGH DUCT PRESSURE ALARM.

THE DUCT HIGH STATIC PRESSURE SENSOR SHALL REQUIRE MANUAL RESET AT DEVICE.

8. SMOKE PROTECTION AND AUTOMATIC SHUTDOWN/RESTART

8.1. A SUPPLY AIR SMOKE DETECTOR IN THE SUPPLY AIR DUCT SHALL STOP THE UNIT AND TRANSMIT A

SIGNAL TO FIRE ALARM SYSTEM UPON DETECTION OF PRODUCTS OF COMBUSTION IN THE DUCT

AND CLOSE THE UNIT ISOLATION SMOKE DAMPERS LOCATED IN SUPPLY AND RETURN DUCT MAINS ADJACENT TO THE UNIT. RE: ELECTRICAL FOR ADDITIONAL REQUIREMENTS. EXHAUST FANS SERVING THE AREA OF THE SUPPLY FAN SHALL CONTINUE TO RUN. THE SUPPLY FAN SHALL RESTART AND

SMOKE DAMPERS SHALL OPEN WHEN FIRE ALARM IS RESET.

8.2. FIRESTATS SHALL BE PROVIDED FOR ANY FAN HANDLING 600CFM OR MORE. FIRESTATS SHALL STOP

ASSOCIATED FAN ON A RISE IN AIR TEMPERATURE ABOVE 125°F.

9. EMERGENCY CONSTANT SPEED OPERATION

9.1. UPON FAILURE OF VFD, THE SUPPLY FAN SHALL BE STARTED/STOPPED MANUALLY AT THE DDC OR

THE ECC THROUGH THE BYPASS STARTER. FANS SHALL THEN BE OPERATED AT CONSTANT SPEED.

AHU 7-AC103 CONTROL SCHEMATIC

& SEQUENCE

7 EXPANSION WLP NMT

M7-403

NOTES;

1. THESE DRAWINGS ARE REPRESENTATIVE OF THE DESIGN DRAWINGS FOR THE BUILDING 7

EXPANSION CURRENTLY ON GOING AND ARE FOR REFERENCE ONLY.

2. ALL EQUIPMENT IN THIS PROJECT WILL BE CONTROLLED BY THE CAMPUS SIEMENS SYSTEM.

SPS-1

AI10

VFD

DO2

AO3

DI5

AI9

DO1

DI1

PANEL

DDC CONTROL

OUTSIDE AIR

D-1

V-2

AO2

T-4

DPS-1

DI6

SD-1

NC-SR

FLOWMETER

T-5

DI2

C W

R

AI5

AI6

AI7

AI8

SUPPLY AIR

F-1

T/H-1

NC

AI14

AO1

AI4

AI2

AI3

T-2

DI3

H W

R

V-1

T-3

DI4

PREHEAT

COIL

T-6

AI11

T-7

AI13

T/H-2T-8T

AI15

T

T-1

AI1

AO4

AI12

H W

R

V-3

HTG

COIL

SEQUENCE OF OPERATION

1. START/STOP CONTROL

1.1. 7E-AHU-7-4 IS NORMALLY STARTED AND STOPPED REMOTELY AT THE ECC. H-O-A SWITCH SHALL BE

KEPT IN THE "AUTO" POSITION. "HAND" AND "OFF" POSITIONS SHALL BE USED ONLY FOR

MAINTENANCE. WHEN FAN RUN STATUS IS PROVEN VIA A CURRENT SENSING RELAY, CONTROL

LOOPS SHALL BE ENERGIZED. STOPPING THE UNIT SHALL DE-ENERGIZE THE CONTROL LOOPS, ALL

VALVES SHALL GO TO THE CLOSED POSITION, AND THE OUTSIDE AIR DAMPER SHALL CLOSE.

2. SAFETIES

2.1. AN INTELLIGENT DUCT SMOKE DETECTOR IN THE PURE SUPPLY AIR (RE: ELECTRICAL) SHALL STOP

THE UNIT UPON DETECTION OF PRODUCTS OF COMBUSTION.

2.2. ELECTRIC LOW LIMIT THERMOSTAT IN THE MIXED AIR SHALL STOP THE UNIT UPON DETECTION OF

TEMPERATURE BELOW ITS SETPOINT.

2.3. FIRESTATS SHALL BE PROVIDED FOR ANY FAN HANDLING 600 CFM OR MORE. FIRESTATS SHALL STOP

ASSOCIATED FAN ON A RISE IN AIR TEMPERATURE ABOVE 125°F.

3. TEMPERATURE CONTROL

3.1. SPACE TEMPERATURE SENSOR LOCATED AS SHOWN THE PLANS SHALL TRANSMIT TEMPERATURE

CHANGES TO THE DDC. THE DDC SHALL MODULATE THE 2-WAY CHILLED WATER AND 3-WAY HOT

WATER PREHEAT VALVE IN SEQUENCE TO MAINTAIN SPACE TEMPERATURE SETPOINT.

4. HUMIDIFICATION CONTROL

4.1. PROVIDE SPACE HUMIDISTAT THAT SHALL OVERRIDE THE THERMOSTAT AND CONTROL THE

COOLING VALVE TO MAINTAIN 55°F LEAVING AIR. THE THERMOSTAT SHALL CONTROL SPACE

TEMPERATURE AT SETPOINT THROUGH THE MODULATION OF THE REHEAT POSITIONED HEATING

HOT WATER COIL VALVE.

5. FILTER STATUS

5.1. FILTER STATUS SHALL BE MONITORED AT EACH PRE-FILTER AND AFTER-FILTER BANK.

F E

D C

B G

Alexandria, Louisiana

A&E Design - Upgrade Energy Management Control Systems

October 30, 2013

VA256-12-C-0253

VETERANS HEALTH CARE

SYSTEM

Alexandria, LA

A

U.S. Department of Veterans Affairs

ZONE AIR

TEMPERATURE

SENSOR

ZONE AIR

TEMPERATURE/

HUMIDITY

SENSOR

AI17

AI16

T/H

RETURN AIR

SUPPLY

FAN

CLG

COIL

AIR

FILTER

T T T T T

F T

COOLING COIL CHILLED WATER FLOWMETER

CHILLED WATER CONTROL VALVE (V-2)

LOCAL DDC CONTROLLER

AI2

AI9

AI8

AI1

AI4

AI5

AI6

AI7

MIXED AIR TEMPERATURE SENSOR (T-1)

AI3

RETURN AIR TEMPERATURE SENSOR (T/H-1)

RETURN AIR HUMIDITY SENSOR (T/H-1)

PREHEAT COIL HOT WATER CONTROL VALVE (V-1)

PREHEAT COIL DISCHARGE AIR TEMPERATURE SENSOR (T-4)

DI1

AIR FILTER STATUS (DPS-1)DI2

OUTSIDE AIR DAMPER (D-1) STATUS

DI3

DI4

DI5

DO1

AO1

AO2

AO3

HEATING COIL STEAM CONTROL VALVE (V-1B)

HEATING COIL STEAM CONTROL VALVE (V-1A)

DO2

OUTSIDE AIR DAMPER (D-1)

DI6

AO4

CHILLED WATER CONTROL VALVE (V-2)

SUPPLY FAN STATUS

REHEAT COIL DISCHARGE AIR TEMPERATURE SENSOR (T-7)

SUPPLY AIR FLOWMETER

AI16

AI15

AI11

AI12

AI13

AI14

COOLING COIL DISCHARGE AIR TEMPERATURE SENSOR (T-5)

AI10

SUPPLY FAN VFD STATUS

SUPPLY DISCHARGE AIR STATIC PRESSURE SENSOR (SPS-1)

SUPPLY DISCHARGE AIR TEMPERATURE SENSOR (T-6)

REHEAT COIL HOT WATER CONTROL VALVE (V-3)

AI17

ZONE AIR TEMPERATURE SENSOR (T-8)

SUPPLY DISCHARGE AIR SMOKE DETECTOR (SD-1)

SUPPLY FAN START/STOP

SUPPLY FAN VFD SPEED

MIXED AIR LOW LIMIT TEMPERATURE SENSOR (T-1) STATUS

ZONE AIR HUMIDITY SENSOR (T/H-2)

ZONE AIR TEMPERATURE SENSOR (T/H-2)

T

PREHEAT COIL DISCHARGE AIR LOW LIMIT TEMPERATURE SENSOR (T-1) STATUS

AHU 7-4 CONTROL SCHEMATIC

& SEQUENCE

7 EXPANSION WLP NMT

M7-404

NOTES;

1. THESE DRAWINGS ARE REPRESENTATIVE OF THE DESIGN DRAWINGS FOR THE BUILDING 7

EXPANSION CURRENTLY ON GOING AND ARE FOR REFERENCE ONLY.

2. ALL EQUIPMENT IN THIS PROJECT WILL BE CONTROLLED BY THE CAMPUS SIEMENS SYSTEM.

SEQUENCE OF OPERATION

1. START/STOP CONTROL

1.1. 7E-AHU-7-4 IS NORMALLY STARTED AND STOPPED REMOTELY AT THE ECC. H-O-A SWITCH SHALL BE

KEPT IN THE "AUTO" POSITION. "HAND" AND "OFF" POSITIONS SHALL BE USED ONLY FOR

MAINTENANCE. WHEN FAN RUN STATUS IS PROVEN VIA A CURRENT SENSING RELAY, THE CONTROL LOOPS SHALL BE ENERGIZED. STOPPING THE UNIT SHALL DE-ENERGIZE THE CONTROL LOOPS AND ALL VALVES SHALL GO TO THE CLOSED POSITION, THE OUTSIDE AIR DAMPER SHALL CLOSE. SUPPLY

AIR SHALL BE METERED TO MONITOR AIRFLOW.

2. SAFETIES

2.1. AN INTELLIGENT DUCT SMOKE DETECTOR IN THE PURE SUPPLY AIR (RE: ELECTRICAL) SHALL STOP

THE UNIT UPON DETECTION OF PRODUCTS OF COMBUSTION.

2.2. ELECTRIC LOW LIMIT THERMOSTAT IN THE MIXED AIR SHALL STOP THE UNIT UPON DETECTION OF

TEMPERATURE BELOW ITS SETPOINT.

2.3. FIRESTATS SHALL BE PROVIDED FOR ANY FAN HANDLING 600 CFM OR MORE. FIRESTATS SHALL STOP

ASSOCIATED FAN ON A RISE IN AIR TEMPERATURE ABOVE 125°F.

3. TEMPERATURE CONTROL

3.1. SPACE TEMPERATURE SENSOR LOCATED AS SHOWN THE PLANS SHALL TRANSMIT TEMPERATURE

CHANGES TO THE DDC. THE DDC SHALL MODULATE THE 2-WAY CHILLED WATER AND 3-WAY HOT

WATER PREHEAT VALVE IN SEQUENCE TO MAINTAIN SPACE TEMPERATURE SETPOINT.

4. HUMIDIFICATION CONTROL

4.1. PROVIDE SPACE HUMIDISTAT THAT SHALL OVERRIDE THE THERMOSTAT AND CONTROL THE

COOLING VALVE TO MAINTAIN 55°F LEAVING AIR. THE THERMOSTAT SHALL CONTROL SPACE

TEMPERATURE AT SETPOINT THROUGH THE MODULATION OF THE REHEAT POSITIONED HEATING

HOT WATER COIL VALVE.

5. FILTER STATUS

5.1. FILTER STATUS SHALL BE MONITORED AT EACH PRE-FILTER AND AFTER-FILTER BANK.

SPS-1

AI10

VFD

DO2

AO3

DI5

AI9

DO1

DI1

PANEL

DDC CONTROL

OUTSIDE AIR

D-1

V-2

AO2

T-4

DPS-1

DI6

SD-1

NC-SR

FLOWMETER

T-5

DI2

C

W R

AI5

AI6

AI7

AI8

SUPPLY AIR

F-1

T/H-1

NC

AI14

AO1

AI4

AI2

AI3

T-2

DI3

H W

R

V-1

T-3

DI4

PREHEAT

COIL

T-6

AI11

T-7

AI13

T/H-2T-8T

AI15

T

T-1

AI1

AO4

AI12

H W

R

V-3

HTG

COIL

ZONE AIR

TEMPERATURE

SENSOR

ZONE AIR

TEMPERATURE/

HUMIDITY

SENSOR

AI17

AI16

T/H

RETURN AIR

SUPPLY

FAN

CLG

COIL

AIR

FILTER

T T T T T

F T

T

F E

D C

B G

Alexandria, Louisiana

A&E Design - Upgrade Energy Management Control Systems

October 30, 2013

VA256-12-C-0253

VETERANS HEALTH CARE

SYSTEM

Alexandria, LA

A

U.S. Department of Veterans Affairs

COOLING COIL CHILLED WATER FLOWMETER

CHILLED WATER CONTROL VALVE (V-2)

LOCAL DDC CONTROLLER

AI2

AI9

AI8

AI1

AI4

AI5

AI6

AI7

MIXED AIR TEMPERATURE SENSOR (T-1)

AI3

RETURN AIR TEMPERATURE SENSOR (T/H-1)

RETURN AIR HUMIDITY SENSOR (T/H-1)

PREHEAT COIL HOT WATER CONTROL VALVE (V-1)

PREHEAT COIL DISCHARGE AIR TEMPERATURE SENSOR (T-4)

DI1

AIR FILTER STATUS (DPS-1)DI2

OUTSIDE AIR DAMPER (D-1) STATUS

DI3

DI4

DI5

DO1

AO1

AO2

AO3

HEATING COIL STEAM CONTROL VALVE (V-1B)

HEATING COIL STEAM CONTROL VALVE (V-1A)

DO2

OUTSIDE AIR DAMPER (D-1)

DI6

AO4

CHILLED WATER CONTROL VALVE (V-2)

SUPPLY FAN STATUS

REHEAT COIL DISCHARGE AIR TEMPERATURE SENSOR (T-7)

SUPPLY AIR FLOWMETER

AI16

AI15

AI11

AI12

AI13

AI14

COOLING COIL DISCHARGE AIR TEMPERATURE SENSOR (T-5)

AI10

SUPPLY FAN VFD STATUS

SUPPLY DISCHARGE AIR STATIC PRESSURE SENSOR (SPS-1)

SUPPLY DISCHARGE AIR TEMPERATURE SENSOR (T-6)

REHEAT COIL HOT WATER CONTROL VALVE (V-3)

AI17

ZONE AIR TEMPERATURE SENSOR (T-8)

SUPPLY DISCHARGE AIR SMOKE DETECTOR (SD-1)

SUPPLY FAN START/STOP

SUPPLY FAN VFD SPEED

MIXED AIR LOW LIMIT TEMPERATURE SENSOR (T-1) STATUS

ZONE AIR HUMIDITY SENSOR (T/H-2)

ZONE AIR TEMPERATURE SENSOR (T/H-2)

PREHEAT COIL DISCHARGE AIR LOW LIMIT TEMPERATURE SENSOR (T-1) STATUS

AHU 7-5 CONTROL SCHEMATIC

& SEQUENCE

7 EXPANSION WLP NMT

M7-405

NOTES;

1. THESE DRAWINGS ARE REPRESENTATIVE OF THE DESIGN DRAWINGS FOR THE BUILDING 7

EXPANSION CURRENTLY ON GOING AND ARE FOR REFERENCE ONLY.

2. ALL EQUIPMENT IN THIS PROJECT WILL BE CONTROLLED BY THE CAMPUS SIEMENS SYSTEM.

VFD

VFD

CHWP#7-2b

SCHWS

SCHWS

DIFFERENTIAL PRESSURE

SENSOR 3/4 LONGEST RUN.

CHWS (EXISTING)

CHWR (EXISTING)

PRIMARY

CHWS

EXISTING

CW PUMPS

EXISTING

CW PUMPS

NC-NSR

NC-NSR

CHWP#7-1b

CHWS (EXISTING BRANCH #3,

NORTH LOOP)

CHWS (NEW BRANCH #4,

BLDG. 7 ADDITION)

CHWS (EXISTING BRANCH

#2, OLD LOOP)

CHWS (EXISTING

BRANCH #1, SOUTH

LOOP)

FCV-1 (EXISTING)

FCV-2 (EXISTING)

FCV-3 (EXISTING)

FLOW CTRL VALVE (TYP)

CHWR (FROM

EXISTING PUMP

147-P-1)

V-1 (EXISTING)

CHWR (FROM

EXISTING PUMP

147-P-2)

V-2 (EXISTING)

CHWR (FROM

EXISTING PUMP

147-P-3)

V-3 (EXISTING)

NC-NSR

7E-V-1

SEQUENCE OF OPERATION

1. GENERAL

1.1. THE EXISTING CONSTANT VOLUME PRIMARY CHILLED WATER SUPPLY FROM THE CENTRAL PLANT PROVIDES CHILLED WATER TO THE VARIABLE (CONTROLLED BY VFD) SECONDARY PUMPING SYSTEM

LOCATED AT THE BUILDING. THERE ARE 2 SECONDARY CHILLED WATER PUMPS (EACH 100%

REDUNDANT). ONLY 1 PUMP AT A TIME SHALL OPERATE TO COOL BUILDING.

1.2. ALL THE PUMP STARTERS ARE EQUIPPED WITH HOA SWITCHES. THE SWITCHES ARE KEPT IN THE "AUTO" POSITION. HAND AND OFF ARE USED ONLY FOR MAINTENANCE PURPOSES. ALL PUMPS SHALL BE STARTED/STOPPED BY THE FMS. ALL PUMPS SHALL PROPER INTERLOCKS TO RESPECTIVE EQUIPMENT

AS PRE MANUFACTURER'S RECOMMENDATIONS.

1.3. UPON A CALL FOR COOLING FROM ANY AIR HANDLING UNIT, FAN COIL UNIT, OR BLOWER COIL UNIT, 1 LEAD CHILLED WATER PUMP SHALL ENERGIZE AND RESPECTIVE VARIABLE FREQUENCY DRIVE (VFD) SHALL MODULATE THE PUMP TO MAINTAIN PRESSURIZATION (ADJUSTABLE) AT THE DIFFERENTIAL

PRESSURE SENSOR LOCATED 3

4 (MIN.) DOWN THE LONGEST PIPING RUN. THE DIFFERENTIAL PRESSURE

SENSOR AND A FLOW SENSOR IN THE SECONDARY LINE SHALL BE USED TO CONTROL THE SPEED OF THE VFD-DRIVEN SECONDARY BUILDING CHILLED WATER PUMP. THE VFD SHALL RAMP UP OR DOWN AS REQUIRE TO MAINTAIN THIS SYSTEM PRESSURE SETPOINT. DIFFERENTIAL PRESSURE SETPOINT IS THE DIFFERENTIAL PRESSURE REQUIRED TO SATISFY THE BRANCH WITH THE HIGHEST PRESSURE DROP AT

DESIGN FLOW. THE DIFFERENTIAL PRESSURE SENSOR MAINTAINS A CONSTANT DIFFERENTIAL

BETWEEN THE SUPPLY LINE AND THE RETURN LINE TO COMPENSATE FOR SYSTEM LOAD CHANGES.

ALSO, CHILLED WATER DIFFERENTIAL PRESSURE SETPOINT SHALL BE RESET BASED ON WEIGHTED

AVERAGE OF THE CHW VALVE DEMAND FROM AHU'S.

1.4. 2-WAY CONTROL VALVE LOCATED AT HYDRONIC BRIDGE CIRCUIT DOWNSTREAM OF THE SECONDARY CHILLED WATER PUMPS WITH A FLOWMETER, TEMPERATURE SENSOR, AND MANUAL BALANCING VALVE SHALL BE UTILIZED TO BYPASS SECONDARY CHILLED WATER FLOW BACK TO THE PRIMARY LOOP AT MIN. VFD SETPOINT, WHILE COOLING COIL 2-WAY VALVES SHUT OFF AS COOLING LOAD DICTATES.

MANUAL BALANCING VALVE SET AT PRESSURE DROP TO MATCH REMAINDER OF BUILDING PIPING

CIRCUIT AT MIN. FLOW.

1.5. SECONDARY CHILLED WATER FLOWS SHALL BE MEASURED AND TOTALIZED AS MEASURED BY

HIGH-ACCURACY FLOWMETERS AT EACH PUMP DISCHARGE, THE SECONDARY HYDRONIC BRIDGE

BYPASS DOWNSTREAM OF PUMP DISCHARGE, AND THE COMMON SECONDARY CHILLED WATER SUPPLY

DOWNSTREAM OF THE BRIDGE BYPASS.

2. LEAD/STANDBY PUMP CONTROL

2.1. IF THE LEAD BUILDING SECONDARY CHILLED WATER PUMP FAILS, THE STANDBY PUMP SHALL BE AUTOMATICALLY STARTED, AND THE SYSTEM SHALL RESUME NORMAL OPERATION. AN ALARM SHALL

SOUND AND DISPLAY AT THE DDC CONTROL PANEL THAT A PUMP HAS FAILED.

2.2. THE LEAD/STANDBY NATURE OF THE PUMPS SHALL BE ROTATED EVERY WEEK TO ENSURE EVEN RUN

TIME OF THE PUMPS.

SEQUENCE OF OPERATION

1. WATER METERING AND TOTALIZING

1.1. IN LINE ELECTROMAGNETIC FLOWMETER (NO MOVING PARTS, FLANGED 316 STAINLESS STEEL BODY) SHALL BE SUITABLE FOR MEASUREMENT OF ELECTRICALLY CONDUCTIVE LIQUIDS IN A WIDE VARIETY OF APPLICATIONS. THE FLOWMETER SHALL HAVE 0.4% FLOW METERING ACCURACY. COMPONENTS SHALL BE MOUNTED IN NEMA 4X ENCLOSURE. PROVIDE INHERENTLY BI-DIRECTIONAL, STANDARD TRANSMITTER THAT PROVIDES A SINLE ANALOG 4-20mA OUTPUT FOR FLOW RATE AND TWO PROGRAMMABLE PULSE OUTPUTS. OUTPUT OF METER SHALL BE SENT TO A WALL-MOUNTED REMOTE DISPLAY PANEL (COORDINATE LOCATION WITH VA AND ENGINEER) FOR TOTALIZATION AND BUILDING ENERGY MANAGEMENT SYSTEM VIA 4-20mA SIGNAL. PROVIDE ALL AC TO DC TRANSFORMERS AS REQUIRED TO POWER METER AND REMOTE DISPLAY PANEL. ALL METER AND REMOTE DISPLAY POWER

AC POWER AC POWER REQUIREMENTS, AND INTERCONNECTING CABLING AND CONDUIT BETWEEN

METER AND REMOTE DISPLAY PANEL TO BE SUPPLIED BY ELECTRICAL.

2. CHILLED WATER METERING AND TOTALIZING

2.1. TYPE POINT DESCRIPTION UNITS TREND ALARM TOTALIZE

AI-1 CHW-F FLOWRATE FT/SEC X X X

AI-1 CHW-TS SUPPLY TEMP °F X X X

AI-1 CHW-TR RETURN TEMP °F X X X

3. PROGRAMS TO BE PROVIDED

3.1. NIGHT SETBACK / MORNING WARM-UP CONTROL

3.2. OPTIMUM START/STOP

3.3. EVENT SCHEDULING

3.4. ALARM REPORTING

3.5. CHILLED WATER PLANT OPERATION AND OPTIMIZATION

3.6. AUTOMATIC RESTART OF EQUIPMENT SEQUENCE AFTER POWER OUTAGE, & UPON RESUMPTION OF

POWER SERVICE

3.7. POWER DEMAND LIMITING

3.8. PREVENTIVE MAINTENANCE INSTRUCTION

3.9. CALCULATING AIRFLOWS, WATERFLOWS, TONNAGE, BTU'S, W, kW, LB/HR, CFM, GPM, CCF, GPH, ETC.

3.10. UTILITY METERING AND TOTALIZATION

3.11. COMPUTER DIAGNOSTIC AND TESTING PROGRAMS

3.12. REMOTE COMMUNICATIONS

F E

D C

B G

Alexandria, Louisiana

A&E Design - Upgrade Energy Management Control Systems

October 30, 2013

VA256-12-C-0253

VETERANS HEALTH CARE

SYSTEM

Alexandria, LA

A

U.S. Department of Veterans Affairs

CHILLER 1

(EXISTING)

DO1

DI1 AI1

CHILLER 2

(EXISTING)

DO2

DI2 AI2

CHILLER 3

(EXISTING)

DO3

DI3 AI3

FS

AI11

AO4

AI7

AO5

AI8

AO6

AI9

AO7

AI10

AO3

AI6

AO2

AI5

AO1

AI4

AI18

AO6

TP FT

AI1 AI2 AI6

F T

AI4

AO1

TAI3

T

AI5

T

AI11

T

AI13

FT

AI9

AI12

AO4

FT

AI16

PAI17

FT

AI10

CHILLER 3 CONTROL VALVE (V-3)

CHWS (BRANCH #4, BLDG. 7 ADD.) CONTROL VALVE (7E-V-1)

LOCAL DDC CONTROLLER

AI2

AI9

AI8

AI1

AI4

AI5

AI6

AI7

CHILLER 1 INTERNAL VFD STATUS

AI3

CHILLER 2 INTERNAL VFD STATUS

CHILLER 3 INTERNAL VFD STATUS

CHILLER 1 CONTROL VALVE (V-1)

CHILLER 2 CONTROL VALVE (V-2)

DI1

CHILLER 2 STATUSDI2

CHILLER 1 STATUS

DO1

AO1

AO2

AO3

DO2

AO4

CHWS (BRANCH #3, NORTH LOOP) CONTROL VALVE (FCV-3)

CHWS (BRANCH #2, OLD LOOP) CONTROL VALVE (FCV-2)

AO5

AO6

CHILLER 1 CONTROL VALVE (V-1)

CHILLER 2 CONTROL VALVE (V-2)

CHILLER 3 CONTROL VALVE (V-3)

CHWS (BRANCH #4, BLDG. 7 ADD.) CONTROL VALVE (7E-V-1)

CHWS (BRANCH #3, NORTH LOOP) CONTROL VALVE (FCV-3)

CHWS (BRANCH #2, OLD LOOP) CONTROL VALVE (FCV-2)

CHILLER 1 START/STOP

CHILLER 2 START/STOP

DO1

DI1

AO2

AI7

DO2

DI2

AO3

AI8

AI14

AO5

AI15

AI10 CHWS (BRANCH #1, SOUTH LOOP) CONTROL VALVE (FCV-1)

AI11 CHWS (BRANCH #4, BLDG. 7 ADD.) FLOWMETER

CHILLER 3 STATUSDI3

AO7 CHWS (BRANCH #1, SOUTH LOOP) CONTROL VALVE (FCV-1)

DO3 CHILLER 3 START/STOP

PRIMARY CHWS FLOWMETER

CHILLED WATER PUMP (CHWP#7-1b) VFD STATUS

LOCAL DDC CONTROLLER

AI2

AI9

AI8

AI1

AI4

AI5

AI6

AI7

PRIMARY CHWS PRESSURE SENSOR

AI3

PRIMARY CHWS TEMPERATURE SENSOR

PRIMARY CHWS BYPASS TEMPERATURE SENSOR

PRIMARY CHWS BYPASS FLOW SWITCH

PRIMARY CHWR TEMPERATURE SENSOR

AI12

SECONDARY CHWS TEMPERATURE SENSORAI13

HYDRONIC BYPASS BRIDGE CONTROL VALVE

AO1

AO2

AO3

AO4

CHILLED WATER PUMP (CHWP#7-2b) VFD STATUS

CHILLED WATER PUMP (CHWP#7-1b) DISCHARGE FLOWMETER

AO5

AO6

CHILLER 1 CONTROL VALVE (V-1)

CHILLED WATER PUMP (CHWP#7-1b) VFD SPEED

CHILLED WATER PUMP (CHWP#7-2b) VFD SPEED

SECONDARY HYDRONIC BRIDGE BYPASS VALVE

SECONDARY CHWS BYPASS LOOP FLOWMETER

SECONDARY CHWS BYPASS VALVE

AI10 CHILLED WATER PUMP (CHWP#7-2b) DISCHARGE FLOWMETER

AI11 SECONDARY CHWR TEMPERATURE SENSOR

HYDRONIC BYPASS BRIDGE FLOWMETERAI14

HYDRONIC BYPASS BRIDGE TEMPERATURE SENSORAI15

SECONDARY CHWS FLOWMETERAI16

PRIMARY

CHWR

F T

T

DIFFERENTIAL PRESSURE SENSORAI17

SECONDARY CHWS BYPASS VALVEAI18

CHILLED WATER PUMP (CHWP#7-1b) STATUSDI1

CHILLED WATER PUMP (CHWP#7-2b) STATUSDI2

DO1

DO2

CHILLED WATER PUMP (CHWP#7-1b) START/STOP

CHILLED WATER PUMP (CHWP#7-2b) START/STOP

PRIMARY & SECONDARY CHILLED

WATER SYSTEMS CONTROL

SCHEMATICS & SEQUENCES

7 EXPANSION WLP NMT

M7-406

NOTES;

1. THESE DRAWINGS ARE REPRESENTATIVE OF THE DESIGN DRAWINGS FOR THE BUILDING 7

EXPANSION CURRENTLY ON GOING AND ARE FOR REFERENCE ONLY.

2. ALL EQUIPMENT IN THIS PROJECT WILL BE CONTROLLED BY THE CAMPUS SIEMENS SYSTEM.

HTG. SET

POINT

CLG. SET

POINT

VALVE OPEN MAX. AIR

VALVE CLOSED

MIN. AIR

SUPPLY AIR

REHEAT COIL

VALVE

ROOM TEMPERATURE

°F (-°C)

°F (+°C)

CONTROL SCHEDULE

COIL

H W

R

V-1

HTG

AI2

AO1

PANEL

DDC CONTROL

T

AI3

T-1

AI4

M

AI1

ROOM SENSOR

T/H-1

T T-1

SEQUENCE OF OPERATION

1. OCCUPIED MODE

1.1. THE STEAM CONTROL VALVE SHALL MODULATE TO MAINTAIN THE LEAVING HOT WATER TEMPERATURE

AT SETPOINT.

1.2. STEAM TO HOT WATER CONVERTERS 7E-HX-1 AND 7E-HX-2 ARE 100% REDUNDANT, REQUIRING ONLY

ONE UNIT TO OPERATE AT FULL LOAD.

1.3. THE LEAVING HOT WATER TEMPERATURE SHALL BE RESET INVERSELY WITH THE OUTDOOR

TEMPERATURE AS SCHEDULED (AT 30 °F O.A., HWS AT 180°F; AT 70°F O.A., HWS AT 140°F). ALSO, LWT

SHALL BE RESET BASED ON HOT WATER RETURN SCHEDULE.

1.4. HOT WATER PUMPS SHALL BE STARTED/STOPPED BY THE FMS. ALL PUMPS SHALL HAVE PROPER INTERLOCKS TO RESPECTIVE EQUIPMENT AS PER EQUIPMENT MANUFACTURER'S RECOMMENDATION.

EACH PUMP IS SIZED FOR 100& OF THE LOAD, I.E. 100% REDUNDANT, REQUIRING ONLY 1 PUMP FOR OPERATION. THE LEAD AND LAG HOT WATER PUMPS AND HEAT EXCHANGERS SHALL BE SEQUENCED BY THE OPERATOR CONTROLS AT THE PRE-DETERMINED INTERVAL (USUALLY 7 DAYS). IN THE EVENT LEAD PUMP FAILS TO START WITHIN 30 SECONDS, AN ALARM SHALL BE INITIATED AND THE LAG PUMP SHALL

START AUTOMATICALLY.

2. VALVE SEQUENCE FOR LEAD HEAT EXCHANGER

2.1. THE 13 CAPACITY STEAM CONTROL VALVE MODULATES FULLY OPEN TO MAINTAIN SETPOINT.

2.2. THE 2 3 CAPACITY STEAM CONTROL VALVE MODULATES FULLY OPEN TO MAINTAIN SETPOINT.

2.3. BOTH THE 13 CAPACITY & 2

3 CAPACITY STEAM CONTROL VALVES MODULATE TOGETHER TO MAINTAIN

SETPOINT.

3. UNOCCUPIED MODE

3.1. WHENEVER OUTSIDE AIR TEMPERATURE IS 40°F (ADJUSTABLE) OR BELOW, THE LOCAL DDC SHALL PLACE THE HOT WATER SYSTEM IN THE OCCUPIED MODE, START PUMPS, AND ACTUATE STEAM VALVES

TO MAINTAIN SETPOINT.

SEQUENCE OF OPERATION

1. OCCUPIED MODE

1.1. A SPACE SENSOR SHALL TRANSMIT ROOM TEMPERATURE AND HUMIDITY TO THE BOX CONTROLLER, WHICH SHALL VERY THE PRIMARY AIRFLOW AND VARY HEATING VALVE TO MAINTAIN SPACE

TEMPERATURE SETPOINTS.

1.2. A RISE IN SPACE TEMPERATURE ABOVE SETPOINT MODULATE PRIMARY AIRFLOW TO MAX. CFM

SETPOINT INTO THE SPACE. A DROP IN SPACE TEMPERATURE SHALL MODULATE THE PRIMARY

AIRFLOW TO MIN. CFM SETPOINT.