36C25618U0323-0002002.pdf

SPS-4

AI14

SPS-2

DI9

SUPPLY

VFD

FAN

DO3

AO3

DI8

AI9

COIL

L P

S

V-1

NO

PREHEAT

AI5

AO1

DI7DI2

D02DO1

DI1

SPS-1

AI2

SUPPLY

PANEL

DDC CONTROL

AI4

T-2

T

T-1

OUTSIDE AIR

D-1

DI3

D-2

T-9T

AI15

NOTES:

1. ALL DEVICES ARE EXISTING DDC. SENSOR, ACTUATORS, ETC. BE

REUSED IF FUNCTIONAL AND COMPATIBLE.

2. PROVIDE NEW CONTROLLER. CONNECT NEW CONTROLLER TO

EXISTING ELECTRICAL SERVICE.

3. ADJUST EXISTING SUPPLY AIR & RETURN AIR HIGH STATIC VENTS TO

PREVENT THEIR OPERATION PRIOR TO HIGH STATIC SHUTDOWN.

AI3

28" ROUND

RETURN AIR FROM

WEST DUCT CHASE

18" ROUND

RETURN AIR

FROM EAST

DUCT CHASE

FLOWMETER

H-1

AI6

T-3

T-4

C H

W R

COIL

CLG

V-2

NC

AI7

AO2

AI12

T-8

SPS-3

AI13

DPS-2

DI5

DPS-1

DI4AI1

AI10

AI11

F-1

F-2

F-3

AIR

FILTER

SD-1

DI11

SD-2

DI6

D-6

D-3

D-4

T-5

AI8

T-6

DI10

T-7

3/4 LONGEST

RUN. CONNECTED

TO V45-1-24 IN

LOBBY C1-1.

SEQUENCE OF OPERATION

1. GENERAL

1.1. THE AIR HANDLING UNIT SHALL BE STARTED AND STOPPED AUTOMATICALLY AT THE ECC. THE HOA SWITCH SHALL BE KEPT IN THE AUTO POSITION. HAND AND OFF POSITIONS SHALL BE USED FOR

MAINTENANCE ONLY. UPON RECEIVING A START COMMAND THE SUPPLY FAN WILL START ONLY

AFTER ALL INTERNAL SAFETIES ARE PROVEN. ONCE FAN RUN STATUS IS PROVEN BY A CURRENT SENSING RELAY, THE CONTROLS SHALL OPERATE ACCORDING TO THE SEQUENCES AS DESCRIBED

BELOW.

2. AIR FLOW

2.1. OUTSIDE AIR IS METERED BY FLOWMETER, F-1, TO MONITOR AND MAINTAIN A CONSTANT MIN.

OUTSIDE AIR FLOW BY MODULATING THE RETURN DAMPER, D-2, AND OUTSIDE AIR DAMPER, D-1, UP

TO THE MAX. FLOW SETPOINT OF 3500 CFM (ADJUSTABLE).

3. TEMPERATURE CONTROL

3.1. TEMPERATURE SENSOR, T-3, IN THE PREHEAT COIL DISCHARGE SHALL TRANSMIT TEMPERATURE CHANGES TO THE DDC. THE DDC SYSTEM SHALL MODULATE THE 2-WAY STEAM PREHEAT CONTROL

VALVE, V-1, TO MAINTAIN PREHEAT TEMPERATURE SETPOINT (ADJUSTABLE).

3.2. TEMPERATURE SENSOR, T-8, IN THE SUPPLY AIR DUCT TRANSMITS TEMPERATURE CHANGES TO THE DDC. THE DDC MODULATES THE 2-WAY COOLING CONTROL VALVE, V-2, TO MAINTAIN DISCHARGE AIR

TEMPERATURE SETPOINT OF 55°F (ADJUSTABLE).

4. STATIC PRESSURE AND SUPPLY FAN SPEED CONTROL

4.1. THE VFD SHALL MODULATE THE SPEED OF THE SUPPLY FAN TO MAINTAIN DISCHARGE AIR STATIC PRESSURE TO ITS SETPOINT OF 1.0 IN. WC. (ADJUSTABLE) AS SENSED BY THE DUCT STATIC

PRESSURE SENSOR, SPS-4, LOCATED 3

4 OF THE WAY DOWN THE LONGEST DUCT MAIN.

4.2. THE SUPPLY FAN SPEED SHALL DECREASE TOWARDS ITS MIN. FREQUENCY. AS THE DISCHARGE AIR

STATIC PRESSURE DECREASES, THE SUPPLY FAN SPEED SHALL INCREASE.

4.3. THE STATIC PRESSURE IS RESET BASED ON ACTUAL BUILDING LOAD BY POLLING ALL VAV TERMINAL

UNITS.

5. DEHUMIDIFICATION CONTROL

5.1. WHEN THE OA DEW POINT IS ABOVE 55°F THE SUPPLY AIR TEMPERATURE SETPOINT SHALL BE 55°F.

6. ALARMS

6.1. THE UNIT SHALL STOP UPON ANY OF THE SAFETIES BEING TRIPPED REGARDLESS OF THE MODE OF

OPERATION (AUTOMATIC, HAND OR BYPASS).

6.2. THE AIR HANDLER RETURN AIR SMOKE DETECTOR, SD-1, AND THE SUPPLY AIR SMOKE DETECTOR, SD-2, SHALL STOP THE UNIT AND CLOSE THE SMOKE DAMPERS UPON SENSING COMBUSTION

PRODUCTS IN THE SYSTEM. SMOKE DETECTORS MUST BE MANUALLY RESET AFTER AN ALARM

CONDITION IN ORDER FOR THE FAN TO RESTART AND THE SMOKE DAMPERS TO OPEN.

6.3. A MIXED AIR TEMPERATURE SENSOR, T-2, UPSTREAM OF THE COOLING COIL SIGNALS THE DDC UPON

A DROP IN TEMPERATURE BELOW 45°F, WHICH SHALL GENERATE AN ALARM TO THE ECC.

6.4. A TEMPERATURE LOW LIMIT SWITCH, T-4 OR T-5, SHALL STOP THE UNIT, CLOSE THE OUTSIDE AIR DAMPER, OPEN THE PREHEAT VALVE, AND SEND A CRITICAL ALARM TO THE ECC UPON SENSING A FALL IN TEMPERATURE BELOW SETPOINT (40°F ADJUSTABLE). THE LOW LIMIT SWITCHES MUST BE

MANUALLY RESET AFTER AN ALARM CONDITION.

6.5. A TEMPERATURE HIGH LIMIT, T-7, WILL SHUTDOWN THE FAN AND SEND AN ALARM TO THE ECC UPON A RISE IN DISCHARGE AIR ABOVE 125°F. THE HIGH LIMIT SWITCH MUST BE MANUALLY RESET AFTER

AN ALARM.

6.6. A DISCHARGE AIR HIGH STATIC PRESSURE SAFETY SWITCH, SPS-2, LOCATED AT THE SUPPLY FAN DISCHARGE WILL STOP THE UNIT UPON SENSING HIGH SUPPLY DUCT STATIC ABOVE 3 IN. STATIC

PRESSURE (ADJUSTABLE) TO PREVENT OVER PRESSURIZING THE DUCTWORK. STATIC PRESSURE

SWITCH IS HARDWIRED TO THE VFD AND UNIT IS SHUTDOWN IN HAND, AUTO, OR BYPASS MODE. THE

HIGH STATIC PRESSURE SAFETIES MUST BE MANUALLY RESET AFTER AN ALARM CONDITION.

6.7. UPON FAILURE OF THE VFD, THE SUPPLY FAN SHALL BE CONTROLLED MANUALLY AT THE DDC PANEL

OR THE ECC THROUGH THE BYPASS STARTER. FAN SHALL BE OPERATED AT CONSTANT SPEED.

7. MONITORING

7.1. THE DCC SYSTEM MONITORS THE DIFFERENTIAL PRESSURE ACROSS EACH FILTER AND GENERATES AN ALARM IF THE DIFFERENTIAL PRESSURE INCREASES ABOVE THE SETPOINT OF 0.75 IN. WC.

(ADJUSTABLE) TO PROVIDE NOTIFICATION OF A DIRTY FILTER.

8. SHUTDOWN

8.1. STOPPING THE UNIT SHALL DE-ENERGIZE THE CONTROL LOOPS AND SEND THE CONTROL VALVES TO THE CLOSED POSITION. THE OUTSIDE AIR DAMPER SHALL CLOSE AND THE RETURN AIR DAMPER

SHALL OPEN.

H

T T T T T T T

OUTSIDE AIR FLOWMETER (F-1)

RETURN AIR TEMPERATURE SENSOR (T-1)AI2

AI1

RETURN AIR HUMIDITY SENSOR (H-1)AI3

MIXED AIR TEMPERATURE SENSOR (T-2)AI4

AI6

AI7

AI5

AI8

AI10

AI11

AI9

AI12

AI13

AI14

AI15

PREHEAT STEAM CONTROL VALVE (V-1)

PREHEAT COIL DISCHARGE AIR TEMPERATURE SENSOR (T-3)

CHILLED WATER CONTROL VALVE (V-2)

COOLING COIL DISCHARGE AIR TEMPERATURE SENSOR (T-5)

SUPPLY FAN VFD STATUS

RETURN AIR WEST CHASE FLOWMETER (F-3)

RETURN AIR EAST CHASE FLOWMETER (F-2)

SUPPLY AIR STATIC PRESSURE SENSOR (SPS-3)

SUPPLY AIR TEMPERATURE SENSOR (T-8)

DISCHARGE AIR STATIC PRESSURE SENSOR (SPS-4)

AMBIENT AIR TEMPERATURE SENSOR (T-9)

DI10

DI11 SUPPLY AIR SMOKE DETECTOR (SD-2) STATUS

HIGH LIMIT TEMPERATURE SENSOR (T-6) STATUS

DI8

DI6

DI7

DI4

DI2

DI3

DI1

DI5

RETURN AIR DAMPER (D-2) STATUS

RETURN AIR SMOKE DETECTOR (SD-1) STATUS

FILTER STATUS (DPS-1)

FILTER STATUS (DPS-2)

DI9

OUTSIDE AIR DAMPER (D-1) STATUS

SUPPLY AIR HIGH LIMIT STATIC PRESSURE SWITCH (SPS-2) STATUS

LOW LIMIT TEMPERATURE SENSORS (T-4 & T-5) STATUS

SUPPLY FAN STATUS

RETURN AIR STATIC PRESSURE LIMIT SENSOR (SPS-1) STATUS

PREHEAT STEAM CONTROL VALVE (V-1)

CHILLED WATER CONTROL VALVE (V-2)

AO1

AO2

AO3

DO1

DO2

DO3

SUPPLY FAN VFD SPEED

OUTSIDE AIR DAMPER (D-1)

RETURN AIR DAMPER (D-2)

SUPPLY FAN START/STOP

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

AMBIENT AIR

TEMPERATURE SENSOR

SMOKE

DAMPER

D-5

45-AHU-01 CONTROL SCHEMATIC,

SEQUENCE, & BALANCE SCHEDULE

45 WLP NMT

M45-200

SUPPLY AIR

SMOKE

DAMPER

DI15

DO7

DI13

DI14 SUPPLY AIR SMOKE DAMPER (D-5) STATUS

RETURN AIR SMOKE DAMPER (D-4) STATUS

DI12 RETURN AIR SMOKE DAMPER (D-3) STATUS

DO4

DO5

DO6

RETURN AIR SMOKE DAMPER (D-3)

RETURN AIR SMOKE DAMPER (D-4)

SUPPLY AIR SMOKE DAMPER (D-5)

RETURN

AIR SMOKE

DAMPER

RETURN

AIR SMOKE

DAMPER

DI13

DO5

DI12

DO4

DI14

DO6

DI15 SUPPLY AIR SMOKE DAMPER (D-6) STATUS

DO7 SUPPLY AIR SMOKE DAMPER (D-6)

AIR HANDLING UNITS BALANCING SCHEDULE

LABEL AREA SERVED SUPPLY CFM OA CFM

COOLING

COIL GPM

PREHEAT COIL

STEAM

(LBS/HR)

HOT WATER

(GPM)

45-AHU-1 FLOORS 1 & 2 CORE 14500 3500 125 310 N/A

45-AHU-2

FLOORS 1 & 2

BEDROOMS

20000 5250 183 464 N/A

45-AHU-3

FLOOR 1 KITCHEN &

DINING RM.

5200 1500 44 124 N/A

45-AHU-4 FLOOR 2 DINING RM. 1200 300 10 N/A 5.0

45-AHU-5

FLOOR 2 MULTPURP. /

CHAPEL

4000 600 24 N/A 7.6

45-AHU-6 FLOOR 1 ATRIUM 1675 250 9.8 N/A 4.0

45-AHU-7

VAV BOXES IN 1ST

FLOOR EXPANSION

8250 1310 50.2 74 N/A

45-AHU-8

VAV BOXES IN 2ND

FLOOR EXPANSION

9325 1835 60.5 104 N/A

10-30-13

AI14

SPS-2

DI9

SUPPLY

FAN

DO3

AO3

DI8

AI9

COIL

V-1

NO

PREHEAT

AI5

AO1

DI7DI2

D02DO1

DI1

SPS-1

AI2

SUPPLY

PANEL

DDC CONTROL

AI4

T-2

T-1

OUTSIDE AIR

D-1

DI3

D-2

AI3

36x24

RETURN AIR

FROM EAST

DUCT CHASE

36x24

RETURN AIR

FROM

CENTRAL

DUCT CHASE

FLOWMETER

H-1

AI6

T-3

T-4 COIL

CLG

V-2

NC

AI7

AO2

AI12

T-8

SPS-3

AI13

DPS-2

DI5

DPS-1

DI4AI1

AI10

AI11

F-1

AIR

FILTER

SD-1

DI11

SD-2

DI6

D-5

T-5

AI8

T-6

DI10

T-7

36x24

RETURN AIR

FROM WEST

DUCT CHASE

3/4 LONGEST

RUN. ABOVE

ROOM 117A.

CONNECTED

TO FEC.

SEQUENCE OF OPERATION

1. GENERAL

1.1. THE AIR HANDLING UNIT SHALL BE STARTED AND STOPPED AUTOMATICALLY AT THE ECC. THE HOA SWITCH SHALL BE KEPT IN THE AUTO POSITION. HAND AND OFF POSITIONS SHALL BE USED FOR

MAINTENANCE ONLY. UPON RECEIVING A START COMMAND THE SUPPLY FAN WILL START ONLY

AFTER ALL INTERNAL SAFETIES ARE PROVEN. ONCE FAN RUN STATUS IS PROVEN BY A CURRENT SENSING RELAY, THE CONTROLS SHALL OPERATE ACCORDING TO THE SEQUENCES AS DESCRIBED

BELOW.

2. AIR FLOW

2.1. OUTSIDE AIR IS METERED BY FLOWMETER, F-1, TO MONITOR AND MAINTAIN A CONSTANT MIN.

OUTSIDE AIR FLOW BY MODULATING THE RETURN DAMPER, D-2, AND OUTSIDE AIR DAMPER, D-1, UP

TO THE MAX. FLOW SETPOINT OF 5250 CFM (ADJUSTABLE).

3. TEMPERATURE CONTROL

3.1. TEMPERATURE SENSOR, T-3, IN THE PREHEAT COIL DISCHARGE SHALL TRANSMIT TEMPERATURE CHANGES TO THE DDC. THE DDC SYSTEM SHALL MODULATE THE 2-WAY STEAM PREHEAT CONTROL

VALVE, V-1, TO MAINTAIN PREHEAT TEMPERATURE SETPOINT (ADJUSTABLE).

3.2. TEMPERATURE SENSOR, T-8, IN THE SUPPLY AIR DUCT TRANSMITS TEMPERATURE CHANGES TO THE DDC. THE DDC MODULATES THE 2-WAY COOLING CONTROL VALVE, V-2, TO MAINTAIN DISCHARGE AIR

TEMPERATURE SETPOINT OF 55°F (ADJUSTABLE).

4. STATIC PRESSURE AND SUPPLY FAN SPEED CONTROL

4.1. THE VFD SHALL MODULATE THE SPEED OF THE SUPPLY FAN TO MAINTAIN DISCHARGE AIR STATIC PRESSURE TO ITS SETPOINT OF 1.0 IN. WC. (ADJUSTABLE) AS SENSED BY THE DUCT STATIC

PRESSURE SENSOR, SPS-4, LOCATED 3

4 OF THE WAY DOWN THE LONGEST DUCT MAIN.

4.2. THE SUPPLY FAN SPEED SHALL DECREASE TOWARDS ITS MIN. FREQUENCY. AS THE DISCHARGE AIR

STATIC PRESSURE DECREASES, THE SUPPLY FAN SPEED SHALL INCREASE.

4.3. THE STATIC PRESSURE IS RESET BASED ON ACTUAL BUILDING LOAD BY POLLING ALL VAV TERMINAL

UNITS.

5. DEHUMIDIFICATION CONTROL

5.1. WHEN THE OA DEW POINT IS ABOVE 55°F THE SUPPLY AIR TEMPERATURE SETPOINT SHALL BE 55°F.

6. ALARMS

6.1. THE UNIT SHALL STOP UPON ANY OF THE SAFETIES BEING TRIPPED REGARDLESS OF THE MODE OF

OPERATION (AUTOMATIC, HAND OR BYPASS).

6.2. THE AIR HANDLER RETURN AIR SMOKE DETECTOR, SD-1, AND THE SUPPLY AIR SMOKE DETECTOR, SD-2, SHALL STOP THE UNIT AND CLOSE THE SMOKE DAMPERS UPON SENSING COMBUSTION

PRODUCTS IN THE SYSTEM. SMOKE DETECTORS MUST BE MANUALLY RESET AFTER AN ALARM

CONDITION IN ORDER FOR THE FAN TO RESTART AND THE SMOKE DAMPERS TO OPEN.

6.3. A MIXED AIR TEMPERATURE SENSOR, T-2, UPSTREAM OF THE COOLING COIL SIGNALS THE DDC UPON

A DROP IN TEMPERATURE BELOW 45°F, WHICH SHALL GENERATE AN ALARM TO THE ECC.

6.4. A TEMPERATURE LOW LIMIT SWITCH, T-4 OR T-5, SHALL STOP THE UNIT, CLOSE THE OUTSIDE AIR DAMPER, OPEN THE PREHEAT VALVE, AND SEND A CRITICAL ALARM TO THE ECC UPON SENSING A FALL IN TEMPERATURE BELOW SETPOINT (40°F ADJUSTABLE). THE LOW LIMIT SWITCHES MUST BE

MANUALLY RESET AFTER AN ALARM CONDITION.

6.5. A TEMPERATURE HIGH LIMIT, T-7, WILL SHUTDOWN THE FAN AND SEND AN ALARM TO THE ECC UPON A RISE IN DISCHARGE AIR ABOVE 125°F. THE HIGH LIMIT SWITCH MUST BE MANUALLY RESET AFTER

AN ALARM.

6.6. A DISCHARGE AIR HIGH STATIC PRESSURE SAFETY SWITCH, SPS-2, LOCATED AT THE SUPPLY FAN DISCHARGE WILL STOP THE UNIT UPON SENSING HIGH SUPPLY DUCT STATIC ABOVE 3 IN. STATIC

PRESSURE (ADJUSTABLE) TO PREVENT OVER PRESSURIZING THE DUCTWORK. STATIC PRESSURE

SWITCH IS HARDWIRED TO THE VFD AND UNIT IS SHUTDOWN IN HAND, AUTO, OR BYPASS MODE. THE

HIGH STATIC PRESSURE SAFETIES MUST BE MANUALLY RESET AFTER AN ALARM CONDITION.

6.7. UPON FAILURE OF THE VFD, THE SUPPLY FAN SHALL BE CONTROLLED MANUALLY AT THE DDC PANEL

OR THE ECC THROUGH THE BYPASS STARTER. FAN SHALL BE OPERATED AT CONSTANT SPEED.

7. MONITORING

7.1. THE DCC SYSTEM MONITORS THE DIFFERENTIAL PRESSURE ACROSS EACH FILTER AND GENERATES AN ALARM IF THE DIFFERENTIAL PRESSURE INCREASES ABOVE THE SETPOINT OF 0.75 IN. WC.

(ADJUSTABLE) TO PROVIDE NOTIFICATION OF A DIRTY FILTER.

8. SHUTDOWN

8.1. STOPPING THE UNIT SHALL DE-ENERGIZE THE CONTROL LOOPS AND SEND THE CONTROL VALVES TO THE CLOSED POSITION. THE OUTSIDE AIR DAMPER SHALL CLOSE AND THE RETURN AIR DAMPER

SHALL OPEN.

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-9T

AI15

AMBIENT AIR

TEMPERATURE SENSOR

F-2

F-3

D-3

D-4

VFD

L P

S

T

C H

W R

H

T T T T T T T

OUTSIDE AIR FLOWMETER (F-1)

RETURN AIR TEMPERATURE SENSOR (T-1)AI2

AI1

RETURN AIR HUMIDITY SENSOR (H-1)AI3

MIXED AIR TEMPERATURE SENSOR (T-2)AI4

AI6

AI7

AI5

AI8

AI10

AI11

AI9

AI12

AI13

AI14

AI15

PREHEAT STEAM CONTROL VALVE (V-1)

PREHEAT COIL DISCHARGE AIR TEMPERATURE SENSOR (T-3)

CHILLED WATER CONTROL VALVE (V-2)

COOLING COIL DISCHARGE AIR TEMPERATURE SENSOR (T-5)

SUPPLY FAN VFD STATUS

RETURN AIR WEST & CENTRAL CHASES FLOWMETER (F-3)

RETURN AIR EAST CHASE FLOWMETER (F-2)

SUPPLY AIR STATIC PRESSURE SENSOR (SPS-3)

SUPPLY AIR TEMPERATURE SENSOR (T-8)

DISCHARGE AIR STATIC PRESSURE SENSOR (SPS-4)

AMBIENT AIR TEMPERATURE SENSOR (T-9)

DI10

DI11 SUPPLY AIR SMOKE DETECTOR (SD-2) STATUS

HIGH LIMIT TEMPERATURE SENSOR (T-6) STATUS

DI8

DI6

DI7

DI4

DI2

DI3

DI1

DI5

RETURN AIR DAMPER (D-2) STATUS

RETURN AIR SMOKE DETECTOR (SD-1) STATUS

FILTER STATUS (DPS-1)

FILTER STATUS (DPS-2)

DI9

OUTSIDE AIR DAMPER (D-1) STATUS

SUPPLY AIR HIGH STATIC LIMIT PRESSURE SWITCH (SPS-2) STATUS

LOW LIMIT TEMPERATURE SENSORS (T-4 & T-5) STATUS

SUPPLY FAN STATUS

RETURN AIR STATIC PRESSURE LIMIT SENSOR (SPS-1) STATUS

PREHEAT STEAM CONTROL VALVE (V-1)

CHILLED WATER CONTROL VALVE (V-2)

AO1

AO2

AO3

DO1

DO2

DO3

SUPPLY FAN VFD SPEED

OUTSIDE AIR DAMPER (D-1)

RETURN AIR DAMPER (D-2)

SUPPLY FAN START/STOP

45-AHU-02 CONTROL SCHEMATIC

& SEQUENCE

45 WLP NMT

M45-201

NOTES:

1. ALL DEVICES ARE EXISTING DDC. SENSOR, ACTUATORS, ETC. BE

REUSED IF FUNCTIONAL AND COMPATIBLE.

2. PROVIDE NEW CONTROLLER. CONNECT NEW CONTROLLER TO

EXISTING ELECTRICAL SERVICE.

3. ADJUST EXISTING SUPPLY AIR & RETURN AIR HIGH STATIC VENTS TO

PREVENT THEIR OPERATION PRIOR TO HIGH STATIC SHUTDOWN.

DI13

DI14 SUPPLY AIR SMOKE DAMPER (D-5) STATUS

RETURN AIR SMOKE DAMPER (D-4) STATUS

DI12 RETURN AIR SMOKE DAMPER (D-3) STATUS

RETURN

AIR SMOKE

DAMPER

RETURN

AIR SMOKE

DAMPER

SUPPLY AIR

SMOKE

DAMPER

DI14

DO6

DI13

DO5

DI12

DO4

DO4

DO5

DO6

RETURN AIR SMOKE DAMPER (D-3)

RETURN AIR SMOKE DAMPER (D-4)

SUPPLY AIR SMOKE DAMPER (D-5)

AI12

SPS-2

DI9

SUPPLY

FAN

DO3

AO3

DI8

AI10

COIL

PREHEAT

AI5

AO1

DI7DI2

D02DO1

DI1

SPS-1

AI3

SUPPLY

PANEL

DDC CONTROL

AI4

T-2

T

T-1

OUTSIDE AIR

D-1

AI2

D-2

DI6

RETURN AIR

FROM 3RD

FLOOR

FLOWMETER

H-1

H

AI6

T-3

T-4 COIL

CLG

AI8

AO2

DI10

AI11

T-7

SPS-3

DI12

DPS-2

DI5

DPS-1

DI4AI1

AI7

F-1

F-2

AIR

FILTER

SD-1

DI11

SD-2

DI3 AI9

T-5

T-6

D-3

LOCATED IN

SAD BEFORE

V45-3-1 IN

PENTHOUSE

MECH RM.

SEQUENCE OF OPERATION

1. GENERAL

1.1. THE AIR HANDLING UNIT SHALL BE STARTED AND STOPPED AUTOMATICALLY AT THE ECC. THE HOA SWITCH SHALL BE KEPT IN THE AUTO POSITION. HAND AND OFF POSITIONS SHALL BE USED FOR

MAINTENANCE ONLY. UPON RECEIVING A START COMMAND THE SUPPLY FAN WILL START ONLY

AFTER ALL INTERNAL SAFETIES ARE PROVEN. ONCE FAN RUN STATUS IS PROVEN BY A CURRENT SENSING RELAY, THE CONTROLS SHALL OPERATE ACCORDING TO THE SEQUENCES AS DESCRIBED

BELOW.

2. AIR FLOW

2.1. OUTSIDE AIR IS METERED BY FLOWMETER, F-1, TO MONITOR AND MAINTAIN A CONSTANT MIN.

OUTSIDE AIR FLOW BY MODULATING THE RETURN DAMPER, D-2, AND OUTSIDE AIR DAMPER, D-1, UP

TO THE MAX. FLOW SETPOINT OF 1500 CFM (ADJUSTABLE).

3. TEMPERATURE CONTROL

3.1. TEMPERATURE SENSOR, T-3, IN THE PREHEAT COIL DISCHARGE SHALL TRANSMIT TEMPERATURE CHANGES TO THE DDC. THE DDC SYSTEM SHALL MODULATE THE 2-WAY STEAM PREHEAT CONTROL

VALVE, V-1, TO MAINTAIN PREHEAT TEMPERATURE SETPOINT (ADJUSTABLE).

3.2. TEMPERATURE SENSOR, T-8, IN THE SUPPLY AIR DUCT TRANSMITS TEMPERATURE CHANGES TO THE DDC. THE DDC MODULATES THE 2-WAY COOLING CONTROL VALVE, V-2, TO MAINTAIN DISCHARGE AIR

TEMPERATURE SETPOINT OF 55°F (ADJUSTABLE).

4. STATIC PRESSURE AND SUPPLY FAN SPEED CONTROL

4.1. THE VFD SHALL MODULATE THE SPEED OF THE SUPPLY FAN TO MAINTAIN DISCHARGE AIR STATIC PRESSURE TO ITS SETPOINT OF 1.0 IN. WC. (ADJUSTABLE) AS SENSED BY THE DUCT STATIC

PRESSURE SENSOR, SPS-4, LOCATED 3

4 OF THE WAY DOWN THE LONGEST DUCT MAIN.

4.2. THE SUPPLY FAN SPEED SHALL DECREASE TOWARDS ITS MIN. FREQUENCY. AS THE DISCHARGE AIR

STATIC PRESSURE DECREASES, THE SUPPLY FAN SPEED SHALL INCREASE.

4.3. THE STATIC PRESSURE IS RESET BASED ON ACTUAL BUILDING LOAD BY POLLING ALL VAV TERMINAL

UNITS.

5. DEHUMIDIFICATION CONTROL

5.1. WHEN THE OA DEW POINT IS ABOVE 55°F THE SUPPLY AIR TEMPERATURE SETPOINT SHALL BE 55°F.

6. ALARMS

6.1. THE UNIT SHALL STOP UPON ANY OF THE SAFETIES BEING TRIPPED REGARDLESS OF THE MODE OF

OPERATION (AUTOMATIC, HAND OR BYPASS).

6.2. THE AIR HANDLER RETURN AIR SMOKE DETECTOR, SD-1, AND THE SUPPLY AIR SMOKE DETECTOR, SD-2, SHALL STOP THE UNIT AND CLOSE THE SMOKE DAMPERS UPON SENSING COMBUSTION

PRODUCTS IN THE SYSTEM. SMOKE DETECTORS MUST BE MANUALLY RESET AFTER AN ALARM

CONDITION IN ORDER FOR THE FAN TO RESTART AND THE SMOKE DAMPERS TO OPEN.

6.3. A MIXED AIR TEMPERATURE SENSOR, T-2, UPSTREAM OF THE COOLING COIL SIGNALS THE DDC UPON

A DROP IN TEMPERATURE BELOW 45°F, WHICH SHALL GENERATE AN ALARM TO THE ECC.

6.4. A TEMPERATURE LOW LIMIT SWITCH, T-4 OR T-5, SHALL STOP THE UNIT, CLOSE THE OUTSIDE AIR DAMPER, OPEN THE PREHEAT VALVE, AND SEND A CRITICAL ALARM TO THE ECC UPON SENSING A FALL IN TEMPERATURE BELOW SETPOINT (40°F ADJUSTABLE). THE LOW LIMIT SWITCHES MUST BE

MANUALLY RESET AFTER AN ALARM CONDITION.

6.5. A TEMPERATURE HIGH LIMIT, T-7, WILL SHUTDOWN THE FAN AND SEND AN ALARM TO THE ECC UPON A RISE IN DISCHARGE AIR ABOVE 125°F. THE HIGH LIMIT SWITCH MUST BE MANUALLY RESET AFTER

AN ALARM.

6.6. A DISCHARGE AIR HIGH STATIC PRESSURE SAFETY SWITCH, SPS-2, LOCATED AT THE SUPPLY FAN DISCHARGE WILL STOP THE UNIT UPON SENSING HIGH SUPPLY DUCT STATIC ABOVE 3 IN. STATIC

PRESSURE (ADJUSTABLE) TO PREVENT OVER PRESSURIZING THE DUCTWORK. STATIC PRESSURE

SWITCH IS HARDWIRED TO THE VFD AND UNIT IS SHUTDOWN IN HAND, AUTO, OR BYPASS MODE. THE

HIGH STATIC PRESSURE SAFETIES MUST BE MANUALLY RESET AFTER AN ALARM CONDITION.

6.7. UPON FAILURE OF THE VFD, THE SUPPLY FAN SHALL BE CONTROLLED MANUALLY AT THE DDC PANEL

OR THE ECC THROUGH THE BYPASS STARTER. FAN SHALL BE OPERATED AT CONSTANT SPEED.

7. MONITORING

7.1. THE DCC SYSTEM MONITORS THE DIFFERENTIAL PRESSURE ACROSS EACH FILTER AND GENERATES AN ALARM IF THE DIFFERENTIAL PRESSURE INCREASES ABOVE THE SETPOINT OF 0.75 IN. WC.

(ADJUSTABLE) TO PROVIDE NOTIFICATION OF A DIRTY FILTER.

8. SHUTDOWN

8.1. STOPPING THE UNIT SHALL DE-ENERGIZE THE CONTROL LOOPS AND SEND THE CONTROL VALVES TO THE CLOSED POSITION. THE OUTSIDE AIR DAMPER SHALL CLOSE AND THE RETURN AIR DAMPER

SHALL OPEN.

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

OUTSIDE AIR FLOWMETER (F-1)

RETURN AIR TEMPERATURE SENSOR (T-1)AI2

AI1

RETURN AIR HUMIDITY SENSOR (H-1)AI3

MIXED AIR TEMPERATURE SENSOR (T-2)AI4

AI6

AI7

AI5

AI8

AI10

AI11

AI9

AI12

AI13

PREHEAT STEAM CONTROL VALVE (V-1)

PREHEAT COIL DISCHARGE AIR TEMPERATURE SENSOR (T-3)

RETURN AIR FLOWMETER (F-2)

CHILLED WATER CONTROL VALVE (V-2)

COOLING COIL DISCHARGE AIR TEMPERATURE SENSOR (T-5)

SUPPLY FAN VFD STATUS

SUPPLY AIR TEMPERATURE SENSOR (T-7)

AMBIENT AIR TEMPERATURE SENSOR (T-8)

AHU DISCHARGE AIR STATIC PRESSURE SENSOR (SPS-3)

DI10

DI11 SUPPLY AIR SMOKE DETECTOR (SD-2) STATUS

HIGH LIMIT TEMPERATURE SENSOR (T-6) STATUS

DI8

DI6

DI7

DI4

DI2

DI3

DI1

DI5

RETURN AIR DAMPER (D-2) STATUS

RETURN AIR SMOKE DETECTOR (SD-1) STATUS

FILTER STATUS (DPS-1)

FILTER STATUS (DPS-2)

DI9

OUTSIDE AIR DAMPER (D-1) STATUS

SUPPLY AIR HIGH STATIC PRESSURE LIMIT SWITCH (SPS-2) STATUS

LOW LIMIT TEMPERATURE SENSORS (T-4 & T-5) STATUS

SUPPLY FAN STATUS

RETURN AIR STATIC PRESSURE LIMIT SENSOR (SPS-1) STATUS

PREHEAT STEAM CONTROL VALVE (V-1)

CHILLED WATER CONTROL VALVE (V-2)

AO1

AO2

AO3

DO1

DO2

DO3

SUPPLY FAN VFD SPEED

OUTSIDE AIR DAMPER (D-1)

RETURN AIR DAMPER (D-2)

SUPPLY FAN START/STOP

T-8T

AI13

AMBIENT AIR

TEMPERATURE SENSOR

T T T T T T V-2

NC VFD

C H

W R

V-1

NO

L P

S

DI12 SYSTEM AIR HIGH LIMIT STATIC PRESSURE SWITCH (SPS-4) STATUS

45-AHU-03 CONTROL SCHEMATIC

& SEQUENCE

45 WLP NMT

M45-202

NOTES:

1. ALL DEVICES ARE EXISTING DDC. SENSOR, ACTUATORS, ETC. BE

REUSED IF FUNCTIONAL AND COMPATIBLE.

2. PROVIDE NEW CONTROLLER. CONNECT NEW CONTROLLER TO

EXISTING ELECTRICAL SERVICES.

DI13 RETURN AIR SMOKE DAMPER (D-3) STATUS

DO4 RETURN AIR SMOKE DAMPER (D-3)

RETURN

AIR SMOKE

DAMPER

DI13

DO4

SUPPLY

STR

FAN

DO3

DI5

COIL

H W

R

V-1

PREHEAT

AI4

AO1

DI4

DO1

DI1 AI3

SUPPLY

PANEL

DDC CONTROL

AI1

T-1

T

T-2

OUTSIDE AIR

D-1

AI2

T-8

AI9

RETURN AIRH-1

AI5

T-3

T-4

C H

W R

COIL

CLG

V-2

NC

AI6

AO2

DI6

AI8

T-7

SPS-1

DI8

DPS-1

DI3

AIR

FILTER

DI7

SD-1

AI7

T-5

T-6

ZONE THERMOSTAT

SENSOR DINING RM

SEQUENCE OF OPERATION

1. GENERAL

1.1. THE AIR HANDLING UNIT SHALL BE STARTED AND STOPPED AUTOMATICALLY AT THE ECC. THE HOA SWITCH SHALL BE KEPT IN THE AUTO POSITION. HAND AND OFF POSITIONS SHALL BE USED FOR MAINTENANCE ONLY. UPON RECEIVING A START COMMAND THE SUPPLY FAN WILL START ONLY AFTER ALL INTERNAL SAFETIES ARE PROVEN. ONCE FAN RUN STATUS IS PROVEN BY A CURRENT SENSING

RELAY, THE CONTROLS SHALL OPERATE ACCORDING TO THE SEQUENCES AS DESCRIBED BELOW.

2. TEMPERATURE CONTROL

2.1. THE ZONE TEMPERATURE SENSOR, T-8, IN THE CONDITIONED SPACE SHALL TRANSMIT TEMPERATURE

CHANGES TO THE DDC. THE DDC SYSTEM SHALL MODULATE THE 3-WAY HOT WATER PREHEAT

CONTROL VALVE, V-1, AND THE 2-WAY CHILLED WATER CONTROL VALVE, V-2, TO MAINTAIN SPACE

TEMPERATURE SETPOINT (ADJUSTABLE).

3. ALARMS

3.1. THE UNIT SHALL STOP UPON ANY OF THE SAFETIES BEING TRIPPED REGARDLESS OF THE MODE OF

OPERATION (AUTOMATIC, HAND OR BYPASS).

3.2. THE SUPPLY AIR SMOKE DETECTOR, SD-1, SHALL STOP THE UNIT UPON SENSING COMBUSTION

PRODUCTS IN THE SYSTEM. SMOKE DETECTORS MUST BE MANUALLY RESET AFTER AN ALARM

CONDITION IN ORDER FOR THE FAN TO RESTART.

3.3. A TEMPERATURE LOW LIMIT SWITCH, T-4, SHALL STOP THE UNIT, CLOSE THE OUTSIDE AIR DAMPER, OPEN THE PREHEAT VALVE, AND SEND A CRITICAL ALARM TO THE ECC UPON SENSING A FALL IN TEMPERATURE BELOW SETPOINT (40°F ADJUSTABLE). THE LOW LIMIT SWITCHES MUST BE MANUALLY

RESET AFTER AN ALARM CONDITION.

3.4. A TEMPERATURE HIGH LIMIT, T-6, WILL SHUTDOWN THE FAN AND SEND AN ALARM TO THE ECC UPON A RISE IN DISCHARGE AIR ABOVE 125°F. THE HIGH LIMIT SWITCH MUST BE MANUALLY RESET AFTER AN

ALARM.

3.5. A DISCHARGE AIR HIGH STATIC PRESSURE SAFETY SWITCH, SPS-1, LOCATED AT THE SUPPLY FAN DISCHARGE WILL STOP THE UNIT UPON SENSING HIGH SUPPLY DUCT STATIC ABOVE 3 IN. STATIC

PRESSURE (ADJUSTABLE) TO PREVENT OVER PRESSURIZING THE DUCTWORK.

4. MONITORING

4.1. THE DCC SYSTEM MONITORS THE DIFFERENTIAL PRESSURE ACROSS EACH FILTER AND GENERATES AN

ALARM IF THE DIFFERENTIAL PRESSURE INCREASES ABOVE THE SETPOINT OF 0.75 IN. WC.

(ADJUSTABLE) TO PROVIDE NOTIFICATION OF A DIRTY FILTER.

5. SHUTDOWN

5.1. STOPPING THE UNIT SHALL DE-ENERGIZE THE CONTROL LOOPS AND SEND THE CONTROL VALVES AND

OUTSIDE AIR DAMPER TO THE CLOSED POSITION.

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

H

T T T T T T

T-9T

AI10

AMBIENT AIR

TEMPERATURE SENSOR

T

MIXED AIR TEMPERATURE SENSOR (T-1)

RETURN AIR TEMPERATURE SENSOR (T-2)AI2

AI1

RETURN AIR HUMIDITY SENSOR (H-1)AI3

HOT WATER CONTROL VALVE (V-1)AI4

AI6

AI7

AI5

AI8

AI9

PREHEAT COIL DISCHARGE AIR TEMPERATURE SENSOR (T-3)

CHILLED WATER CONTROL VALVE (V-2)

COOLING COIL DISCHARGE AIR TEMPERATURE SENSOR (T-5)

AMBIENT AIR TEMPERATURE SENSOR (T-8)

DI6

DI7

DI4

DI2

DI3

DI1

DI5

OUTSIDE AIR DAMPER (D-1) STATUS

HOT WATER CONTROL VALVE (V-1)

CHILLED WATER CONTROL VALVE (V-2)

AO1

AO2

DO1

DO2

OUTSIDE AIR DAMPER (D-1)

ZONE TEMPERATURE SENSOR (T-8)

FILTER STATUS (DPS-1)

LOW LIMIT TEMPERATURE SENSOR (T-4) STATUS

SUPPLY FAN STATUS

SUPPLY AIR SMOKE DETECTOR (SD-1) STATUS

HIGH LIMIT TEMPERATURE SENSOR (T-6) STATUS

SUPPLY AIR HIGH STATIC PRESSURE SWITCH (SPS-1) STATUS

RETURN AIR DAMPER (D-2)

DI2

D02

D-2

DI8

RETURN AIR DAMPER (D-2) STATUS

DO3 SUPPLY FAN START/STOP

45-AHU-04 CONTROL SCHEMATIC

& SEQUENCE

45 WLP NMT

M45-203

NOTES:

1. ALL DEVICES ARE EXISTING DDC. SENSOR,

ACTUATORS, ETC. BE REUSED IF FUNCTIONAL AND

COMPATIBLE.

2. PROVIDE NEW CONTROLLER AND SPACE

TEMPERATURE SENSOR.

3. CONNECT NEW CONTROLLER TO EXISTING

ELECTRICAL SERVICE.

AI10

COOLING COIL DISCHARGE AIR TEMPERATURE SENSOR (T-5)

AHU DISCHARGE AIR TEMPERATURE SENSOR (T-7)

SEQUENCE OF OPERATION

1. GENERAL

1.1. THE AIR HANDLING UNIT SHALL BE STARTED AND STOPPED AUTOMATICALLY AT THE ECC. THE HOA SWITCH SHALL BE KEPT IN THE AUTO POSITION. HAND AND OFF POSITIONS SHALL BE USED FOR

MAINTENANCE ONLY.

1.2. UPON RECEIVING A START COMMAND THE SUPPLY FAN WILL START ONLY AFTER ALL INTERNAL SAFETIES ARE PROVEN. ONCE FAN RUN STATUS IS PROVEN BY A CURRENT SENSING RELAY, THE

CONTROLS SHALL OPERATE ACCORDING TO THE SEQUENCES AS DESCRIBED BELOW.

2. TEMPERATURE CONTROL

2.1. THE ZONE TEMPERATURE SENSOR, T-8, IN THE CONDITIONED SPACE SHALL TRANSMIT

TEMPERATURE CHANGES TO THE DDC. THE DDC SYSTEM SHALL MODULATE THE 3-WAY HOT WATER PREHEAT CONTROL VALVE, V-1, AND THE 2-WAY CHILLED WATER CONTROL VALVE, V-2, TO MAINTAIN

SPACE TEMPERATURE SETPOINT (ADJUSTABLE).

3. ALARMS

3.1. THE UNIT SHALL STOP UPON ANY OF THE SAFETIES BEING TRIPPED REGARDLESS OF THE MODE OF

OPERATION (AUTOMATIC, HAND OR BYPASS).

3.2. THE RETURN AIR SMOKE DETECTOR, SD-1, OR SUPPLY AIR SMOKE DETECTOR, SD-2, SHALL STOP

THE UNIT UPON SENSING COMBUSTION PRODUCTS IN THE SYSTEM. SMOKE DETECTORS MUST BE

MANUALLY RESET AFTER AN ALARM CONDITION IN ORDER FOR THE FAN TO RESTART.

3.3. A TEMPERATURE LOW LIMIT SWITCH, T-4, SHALL STOP THE UNIT, CLOSE THE OUTSIDE AIR DAMPER, OPEN THE PREHEAT VALVE, AND SEND A CRITICAL ALARM TO THE ECC UPON SENSING A FALL IN TEMPERATURE BELOW SETPOINT (40°F ADJUSTABLE). THE LOW LIMIT SWITCHES MUST BE MANUALLY

RESET AFTER AN ALARM CONDITION.

3.4. A TEMPERATURE HIGH LIMIT, T-6, WILL SHUTDOWN THE FAN AND SEND AN ALARM TO THE ECC UPON A RISE IN DISCHARGE AIR ABOVE 125°F. THE HIGH LIMIT SWITCH MUST BE MANUALLY RESET AFTER

AN ALARM.

3.5. A DISCHARGE AIR HIGH STATIC PRESSURE SAFETY SWITCH, SPS-1, LOCATED AT THE SUPPLY FAN DISCHARGE WILL STOP THE UNIT UPON SENSING HIGH SUPPLY DUCT STATIC ABOVE 3 IN. STATIC

PRESSURE (ADJUSTABLE) TO PREVENT OVER PRESSURIZING THE DUCTWORK.

4. MONITORING

4.1. THE DCC SYSTEM MONITORS THE DIFFERENTIAL PRESSURE ACROSS EACH FILTER AND GENERATES AN ALARM IF THE DIFFERENTIAL PRESSURE INCREASES ABOVE THE SETPOINT OF 0.75 IN. WC.

(ADJUSTABLE) TO PROVIDE NOTIFICATION OF A DIRTY FILTER.

5. SHUTDOWN

5.1. STOPPING THE UNIT SHALL DE-ENERGIZE THE CONTROL LOOPS AND SEND THE CONTROL VALVES

AND OUTSIDE AIR DAMPER TO THE CLOSED POSITION.

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

SUPPLY

STR

FAN

DO3

DI6

COIL

H W

R

V-1

PREHEAT

AI4

AO1

DI5

DO1

DI1 AI2

SUPPLY

PANEL

DDC CONTROL

AI3

T-2

T

T-1

OUTSIDE AIR

D-1

AI1

T-8

AI9

RETURN AIRH-1

AI5

T-3

T-4

C H

W R

COIL

CLG

V-2

NC

AI6

AO2

DI7

AI8

T-7

SPS-1

DI9

DPS-1

DI3

AIR

FILTER

DI8

SD-2

AI7

T-5

T-6

ZONE THERMOSTAT

SENSOR DINING RM

H

T T T T T T

T-9T

AI10

AMBIENT AIR

TEMPERATURE SENSOR

T

RETURN AIR TEMPERATURE SENSOR (T-1)

RETURN AIR HUMIDITY SENSOR (H-1)AI2

AI1

MIXED AIR TEMPERATURE SENSOR (T-2)AI3

HOT WATER CONTROL VALVE (V-1)AI4

AI6

AI7

AI5

AI8

AI9

PREHEAT COIL DISCHARGE AIR TEMPERATURE SENSOR (T-3)

CHILLED WATER CONTROL VALVE (V-2)

COOLING COIL DISCHARGE AIR TEMPERATURE SENSOR (T-5)

ZONE TEMPERATURE SENSOR (T-8)

DI6

DI7

DI4

DI2

DI3

DI1

DI5

OUTSIDE AIR DAMPER (D-1) STATUS

HOT WATER CONTROL VALVE (V-1)

CHILLED WATER CONTROL VALVE (V-2)

AO1

AO2

DO1

DO2

OUTSIDE AIR DAMPER (D-1)

AHU DISCHARGE AIR TEMPERATURE SENSOR (T-7)

FILTER STATUS (DPS-1)

LOW LIMIT TEMPERATURE SENSOR (T-4) STATUS

SUPPLY FAN STATUS

SUPPLY AIR SMOKE DETECTOR (SD-2) STATUS

HIGH LIMIT TEMPERATURE SENSOR (T-6) STATUS

SUPPLY AIR HIGH STATIC PRESSURE SWITCH (SPS-1) STATUS

OUTSIDE AIR DAMPER (D-1)

SD-1

DI4

RETURN AIR SMOKE DETECTOR (SD-1) STATUS

DI8

DI2

D02

D-2

DI9

RETURN AIR DAMPER (D-2) STATUS

DO3 SUPPLY FAN START/STOP

45-AHU-05 CONTROL SCHEMATIC

& SEQUENCE

45 WLP NMT

M45-204

NOTES:

1. ALL DEVICES ARE EXISTING DDC. SENSOR, ACTUATORS,

ETC. BE REUSED IF FUNCTIONAL AND COMPATIBLE.

2. PROVIDE NEW CONTROLLER AND SPACE TEMPERATURE

SENSOR.

3. CONNECT NEW CONTROLLER TO EXISTING ELECTRICAL

SERVICE.

AI10 AMBIENT AIR TEMPERATURE SENSOR (T-9)

NOTES:

1. ALL DEVICES ARE EXISTING DDC. SENSORS,

ACTUATORS, ETC. MAY BE REUSED IF

FUNCTIONAL AND COMPATIBLE.

2. PROVIDE NEW CONTROLLER. CONNECT NEW

CONTROLLER TO EXISTING ELECTRICAL

SERVICE.

3. AHU IS LOCATED OUTSIDE. ALL CONTROL

DEVICES SHALL BE EXTERIOR GRADE OR

PROVIDE WITH WEATHERPROOF COVERING.

REPLACE EXISTING COVERS AS REQUIRED.

SUPPLY

FAN

DO3

DI5

COIL

CLG

AI4

AO1

SUPPLY

PANEL

DDC CONTROL

AI3

T-2

T-8

AI10

RETURN AIR

AI5

T-4

COIL

HTG

AI6

AO2

DI6

AI8

T-7

SPS-1

DI8

DI7

SD-1

AI7

T-5

T-6

ZONE THERMOSTAT

SENSOR CHAPEL RM

DI4

T-3

SEQUENCE OF OPERATION

1. GENERAL

1.1. THE AIR HANDLING UNIT SHALL BE STARTED AND STOPPED AUTOMATICALLY AT THE ECC. THE HOA SWITCH SHALL BE KEPT IN THE AUTO POSITION. HAND AND OFF POSITIONS SHALL BE USED FOR

MAINTENANCE ONLY.

1.2. UPON RECEIVING A START COMMAND THE SUPPLY FAN WILL START ONLY AFTER ALL INTERNAL SAFETIES ARE PROVEN. ONCE FAN RUN STATUS IS PROVEN BY A CURRENT SENSING RELAY, THE

CONTROLS SHALL OPERATE ACCORDING TO THE SEQUENCES AS DESCRIBED BELOW.

2. TEMPERATURE CONTROL

2.1. THE ZONE TEMPERATURE SENSOR, T-8, IN THE CONDITIONED SPACE SHALL TRANSMIT

TEMPERATURE CHANGES TO THE DDC. THE DDC SYSTEM SHALL MODULATE THE 2-WAY CHILLED

WATER CONTROL VALVE, V-1, AND THE 3-WAY HOT WATER REHEAT CONTROL VALVE, V-2, TO

MAINTAIN SPACE TEMPERATURE SETPOINT (ADJUSTABLE).

3. HUMIDITY CONTROL

3.1. THE ZONE HUMIDITY SENSOR, H-2, SHALL OVERRIDE THE THERMOSTAT AND CONTROL THE COOLING VALVE TO MAINTAIN 55°F DISCHARGE AIR. THE THERMOSTAT SHALL CONTROL SPACE TEMPERATURE

AT SETPOINT BY MODULATING THE REHEAT WATER COIL VALVE.

4. ALARMS

4.1. THE UNIT SHALL STOP UPON ANY OF THE SAFETIES BEING TRIPPED REGARDLESS OF THE MODE OF

OPERATION (AUTOMATIC, HAND OR BYPASS).

4.2. THE SUPPLY AIR SMOKE DETECTOR, SD-1, SHALL STOP THE UNIT UPON SENSING COMBUSTION

PRODUCTS IN THE SYSTEM. SMOKE DETECTORS MUST BE MANUALLY RESET AFTER AN ALARM

CONDITION IN ORDER FOR THE FAN TO RESTART.

4.3. A TEMPERATURE LOW LIMIT SWITCH, T-3, SHALL STOP THE UNIT, CLOSE THE OUTSIDE AIR DAMPER, OPEN THE PREHEAT VALVE, AND SEND A CRITICAL ALARM TO THE ECC UPON SENSING A FALL IN TEMPERATURE BELOW SETPOINT (40°F ADJUSTABLE). THE LOW LIMIT SWITCHES MUST BE MANUALLY

RESET AFTER AN ALARM CONDITION.

4.4. A TEMPERATURE HIGH LIMIT, T-6, WILL SHUTDOWN THE FAN AND SEND AN ALARM TO THE ECC UPON A RISE IN DISCHARGE AIR ABOVE 125°F. THE HIGH LIMIT SWITCH MUST BE MANUALLY RESET AFTER

AN ALARM.

4.5. A DISCHARGE AIR HIGH STATIC PRESSURE SAFETY SWITCH, SPS-1, LOCATED AT THE SUPPLY FAN DISCHARGE WILL STOP THE UNIT UPON SENSING HIGH SUPPLY DUCT STATIC ABOVE 3 IN. STATIC

PRESSURE (ADJUSTABLE) TO PREVENT OVER PRESSURIZING THE DUCTWORK.

5. MONITORING

5.1. THE DCC SYSTEM MONITORS THE DIFFERENTIAL PRESSURE ACROSS EACH FILTER AND GENERATES AN ALARM IF THE DIFFERENTIAL PRESSURE INCREASES ABOVE THE SETPOINT OF 0.75 IN. WC.

(ADJUSTABLE) TO PROVIDE NOTIFICATION OF A DIRTY FILTER.

6. SHUTDOWN

6.1. STOPPING THE UNIT SHALL DE-ENERGIZE THE CONTROL LOOPS AND SEND THE CONTROL VALVES

AND OUTSIDE AIR DAMPER TO THE CLOSED POSITION.

AI9

H-2

ZONE HUMIDITY

SENSOR CHAPEL RM

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

DO1

DI1 AI2

T

T-1

OUTSIDE AIR

D-1

AI1

H-1

DPS-1

DI3

AIR

FILTER

H

STR

C H

W R

V-1

NC

H W

R

V-2 T T T T T

T-9T

AI11

AMBIENT AIR

TEMPERATURE SENSOR

HT

RETURN AIR TEMPERATURE SENSOR (T-1)

RETURN AIR HUMIDITY SENSOR (H-1)AI2

AI1

MIXED AIR TEMPERATURE SENSOR (T-2)AI3

CHILLED WATER CONTROL VALVE (V-1)AI4

AI6

AI7

AI5

AI8

AI9

COOLING COIL DISCHARGE AIR TEMPERATURE SENSOR (T-5)

HOT WATER CONTROL VALVE (V-2)

HEATING COIL DISCHARGE AIR TEMPERATURE SENSOR (T-5)

ZONE TEMPERATURE SENSOR (T-8)

DI6

DI7

DI4

DI2

DI3

DI1

DI5

OUTSIDE AIR DAMPER (D-1) STATUS

CHILLED WATER CONTROL VALVE (V-1)

HOT WATER CONTROL VALVE (V-2)

AO1

AO2

DO1

DO2

OUTSIDE AIR DAMPER (D-1)

SUPPLY AIR TEMPERATURE SENSOR (T-7)

FILTER STATUS (DPS-1)

LOW LIMIT TEMPERATURE SENSOR (T-4) STATUS

SUPPLY FAN STATUS

SUPPLY AIR SMOKE DETECTOR (SD-1) STATUS

HIGH LIMIT TEMPERATURE SENSOR (T-6) STATUS

SUPPLY AIR HIGH STATIC PRESSURE SWITCH (SPS-1) STATUS

RETURN AIR DAMPER (D-2)

AI10

AI11 AMBIENT AIR TEMPERATURE SENSOR (T-9)

ZONE HUMIDITY SENSOR (H-2)

DI2

D02

D-2

RETURN AIR DAMPER (D-2) STATUS

DI8

DO3 SUPPLY FAN START/STOP

45-AHU-06 CONTROL SCHEMATIC

& SEQUENCE

45 WLP NMT

M45-205

FAN

AO4

AI8

COIL

L P

S

V-1

NO

HTG

AI4

AO2

PANEL

DDC CONTROL

AI3

T-1OUTSIDE AIR

RETURN AIR

T

AI5

T-2

C H

W R

COIL

CLG

V-2

NC

AI6

AO3

AI9

T-3

SPS-1

DI5

DPS-1

DI2

AIR

FILTER

FLOWMETER

AI1

F-1

DO2

DI4

OA

VFD

FAN

AO1

AI2

DO1

DI1

C H

W S

AI7

DPS-2

DI6

AIR

FILTER

AI10

F-2

SPS-2

DI7

AI11

F-3

SPS-3

DI8

CONTROL PANEL

VAV45-7-8

CONTROL PANEL

VAV45-7-9

F T

SEQUENCE OF OPERATION

1. GENERAL

1.1. THE AIR HANDLING UNIT SHALL BE STARTED AND STOPPED AUTOMATICALLY AT THE ECC. THE HOA SWITCH SHALL BE KEPT IN THE AUTO POSITION. HAND AND OFF POSITIONS SHALL BE USED FOR

MAINTENANCE ONLY.

2. TEMPERATURE CONTROLS

2.1. WHEN OA DEWPOINT TEMPERATURE IS ABOVE 55°F THE SUPPLY AIR TEMPERATURE, SENSED BY T-3, SHALL BE MAINTAIN AT TEMPERATURE SETPOINT 55°F (ADJUSTABLE) VIA DDC BY MODULATING THE COOLING CONTROL VALVE, V-2. SUPPLY AIR TEMPERATURE SETPOINT SHALL BE RESET WHEN OA DEWPOINT IS BELOW 55°F BASED ON TERMINAL BOX DEMAD, FAN SPEED, AND OUTSIDE AIR DEW

POINT.

2.2. WHEN THE TEMPERATURE OF THE MIXED AIR, SENSED BY T-1, IS BELOW 40°F, THE DDC SHALL MODULATE THE HEATING CONTROL VALVE, V-1, TO MAINTAIN THE AIR TEMPERATURE SENSED BY T-3

AT 55°F (ADJUSTABLE).

3. AIR FLOW CONTROLS

3.1. THE SUPPLY AIR FLOW SHALL BE CONTROLLED BY MODULATING THE SUPPLY FAN VFD TO MAINTAIN 1.0" OF DUCT STATIC PRESSURE (ADJUSTABLE) SENSED BY SPS-2. SEE FLOOR PLANS FOR THE

LOCATION OF SPS-2. STATIC PRESSURE SETPOINT SHALL BE RESET BASED ON TERMINAL BOX

DAMPER POSITIONS TO MINIMIZE FAN ENERGY.

3.2. THE OUTSIDE AIR FLOW SHALL BE CONTROLLED THE DDC MODULATING THE OUTSIDE AIR FAN VFD

TO MAINTAIN OUTSIDE AIR FLOW AT THE SCHEDULED CFM.

3.3. THE DDC, USING HIGH PRESSURE SENSOR, SPS-1, LOCATED AT THE SUPPLY FAN DISCHARGE SHALL PREVENT THE SUPPLY FAN FROM DEVELOPING OVER 3" OF STATIC PRESSURE (ADJUSTABLE). IF

STATIC PRESSURE AT SPS-1 DOES EXCEED 3", THE SUPPLY AIR FAN SHALL STOP.

4. FREEZE PROTECTION

4.1. IF THE AIR TEMPERATURE, AS SENSED BY T-2, FALLS BELOW 45°F, AN ALARM SIGNAL SHALL INDICATE AT THE DDC AND ECC. IF THE TEMPERATURE FALLS BELOW 40°F, THE SUPPLY AND RETURN FANS

SHALL SHUT DOWN AND A CRITICAL ALARM SHALL INDICATE DDC AND ECC.

5. EMERGENCY CONTACT SPEED OPERATION

5.1. UPON FAILURE OF THE 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.

6. FILTER STATUS

6.1. WHEN FILTER STATIC PRESSURE, AS SENSED BY EITHER DPS-1 OR DPS-2, EXCEEDS SPECIFIED MAX.

STATIC PRESSURE, AN ALARM SIGNAL SHALL INDICATE AT THE DDC AND ECC.

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

TT VFD

OUTSIDE AIR FLOWMETER (F-1)

OUTSIDE AIR FAN VFD STATUSAI2

AI1

MIXED AIR TEMPERATURE SENSOR (T-1)AI3

HOT WATER CONTROL VALVE (V-1)AI4

AI6

AI7

AI5

AI8

AI9

HEATING COIL DISCHARGE AIR TEMPERATURE SENSOR (T-2)

CHILLED WATER CONTROL VALVE (V-2)

CHILLED WATER SUPPLY FLOWMETER

SUPPLY AIR TEMPERATURE SENSOR (T-3)

DI6

DI7

DI4

DI2

DI3

DI1

DI5

OUTSIDE AIR FAN STATUS

OUTSIDE AIR FAN VFD SPEED

HOT WATER CONTROL VALVE (V-1)

AO1

AO2

DO1

DO2

OUTSIDE AIR FAN START/STOP

SUPPLY FAN VFD STATUS

RETURN AIR SMOKE DETECTOR (SD-1) STATUS

SUPPLY FAN STATUS

FILTER STATUS (DPS-2)

SUPPLY FAN DISCHARGE HIGH STATIC PRESSURE SWITCH (SPS-1) STATUS

SUPPLY AIR HIGH STATIC PRESSURE SWITCH (SPS-2) STATUS

AI10

AI11 DOWNSTREAM SUPPLY AIR FLOWMETER (F-3)

DISCHARGE SUPPLY AIR FLOWMETER (F-2)

DI8 DOWNSTREAM SUPPLY AIR HIGH STATIC PRESSURE SWITCH (SPS-3) STATUS

CHILLED WATER CONTROL VALVE (V-2)

SUPPLY FAN VFD SPEED

AO3

AO4

KEYNOTES:

EXISTING TEMPERATURE ELEMENT IS LAYING

IN BOTTOM OF AHU. SECURELY AND

PERMANENTLY REINSTALL EXISTING

TEMPERATURE ELEMENT.

SD-1

DI3

FILTER STATUS (DPS-1)

SUPPLY FAN START/STOP

45-AHU-07 CONTROL SCHEMATIC

& SEQUENCE

45 WLP NMT

M45-206

NOTES:

1. ALL DEVICES ARE EXISTING DDC. SENSOR, ACTUATORS,

ETC. BE REUSED IF FUNCTIONAL AND COMPATIBLE.

2. PROVIDE NEW CONTROLLER. CONNECT NEW

CONTROLLER TO EXISTING ELECTRICAL SERVICE.

FAN

AO4

AI7

COIL

V-1

NO

HTG

AI4

AO2

PANEL

DDC CONTROL

AI3

T-1OUTSIDE AIR

RETURN AIR

AI5

T-2

COIL

CLG

NC

AI6

AO3

AI8

T-3

SPS-1

DI5

DPS-1

DI2

AIR

FILTER

FLOWMETER

AI1

F-1

DO2

DI4

OA

FAN

AO1

AI2

DO1

DI1

CONTROL PANEL

VAV45-8-8

SEQUENCE OF OPERATION

1. GENERAL

1.1. THE AIR HANDLING UNIT SHALL BE STARTED AND STOPPED AUTOMATICALLY AT THE ECC. THE HOA SWITCH SHALL BE KEPT IN THE AUTO POSITION. HAND AND OFF POSITIONS SHALL BE USED FOR

MAINTENANCE ONLY.

2. TEMPERATURE CONTROLS

2.1. WHEN THE OA DEWPOINT TEMPERATURE IS ABOVE 55°F THE SUPPLY AIR TEMPERATURE, SENSED BY T-3, SHALL BE MAINTAIN AT TEMPERATURE SETPOINT 55°F (ADJUSTABLE) VIA DDC BY MODULATING

THE COOLING CONTROL VALVE, V-2. WHEN OA DEWPOINT IS BELOW 55°F THE SUPPLY AIR

TEMPERATURE SETPOINT SHALL BE RESET BASED ON TERMINAL BOX DEMAND, FAN SPEED, AND

OUTSIDE AIR DEW POINT TO MINIMIZE TOTAL ENERGY USAGE.

2.2. WHEN THE TEMPERATURE OF THE MIXED AIR, SENSED BY T-2, IS BELOW 40°F, THE DDC SHALL MODULATE THE HEATING CONTROL VALVE, V-1, TO MAINTAIN THE AIR TEMPERATURE SENSED BY T-3

AT 55°F (ADJUSTABLE).

3. AIR FLOW CONTROLS

3.1. THE SUPPLY AIR FLOW SHALL BE CONTROLLED BY THE DDC MODULATING THE SUPPLY FAN VFD TO MAINTAIN 1.0" OF DUCT STATIC PRESSURE (ADJUSTABLE) SENSED BY SPS-2. SEE FLOOR PLANS FOR THE LOCATION OF SPS-2. STATIC PRESSURE SETPOINT SHALL BE RESET BASED ON TERMINAL BOX

DAMPER POSITIONS TO MINIMIZE FAN ENERGY.

3.2. THE OUTSIDE AIR FLOW SHALL BE CONTROLLED MODULATING THE OUTSIDE AIR FAN VFD TO

MAINTAIN OUTSIDE AIR FLOW AT THE SCHEDULED CFM.

3.3. THE DDC, USING HIGH PRESSURE SENSOR, SPS-1, LOCATED AT THE SUPPLY FAN DISCHARGE SHALL PREVENT THE SUPPLY FAN FROM DEVELOPING OVER 3" OF STATIC PRESSURE (ADJUSTABLE). IF

STATIC PRESSURE AT SPS-1 DOES EXCEED 3", THE SUPPLY AIR FAN SHALL STOP.

4. FREEZE PROTECTION

4.1. IF THE AIR TEMPERATURE, AS SENSED BY T-2, FALLS BELOW 45°F, AN ALARM SIGNAL SHALL INDICATE AT THE DDC AND ECC. IF THE TEMPERATURE FALLS BELOW 40°F, THE SUPPLY AND RETURN FANS

SHALL SHUT DOWN AND A CRITICAL ALARM SHALL INDICATE DDC AND ECC.

5. EMERGENCY CONTACT SPEED OPERATION

5.1. UPON FAILURE OF THE 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.

6. FILTER STATUS

6.1. WHEN FILTER STATIC PRESSURE, AS SENSED BY EITHER DPS-1 OR DPS-2, EXCEEDS SPECIFIED MAX.

STATIC PRESSURE, AN ALARM SIGNAL SHALL INDICATE AT THE DDC AND ECC.

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-4T

AI10

AMBIENT AIR

TEMPERATURE SENSOR

L P

S

C H

W R

V-2

VFD VFDT T T

OUTSIDE AIR FLOWMETER (F-1)

OUTSIDE AIR FAN VFD STATUSAI2

AI1

MIXED AIR TEMPERATURE SENSOR (T-1)AI3

HOT WATER CONTROL VALVE (V-1)AI4

AI6

AI7

AI5

AI8

AI9

HEATING COIL DISCHARGE AIR TEMPERATURE SENSOR (T-2)

CHILLED WATER CONTROL VALVE (V-2)

SUPPLY AIR TEMPERATURE SENSOR (T-3)

DI6

DI7

DI4

DI2

DI3

DI1

DI5

OUTSIDE AIR FAN STATUS

SUPPLY FAN VFD STATUS

SUPPLY FAN STATUS

FILTER STATUS (DPS-2)

SUPPLY FAN DISCHARGE HIGH STATIC PRESSURE SWITCH (SPS-1) STATUS

SUPPLY AIR HIGH STATIC PRESSURE SWITCH (SPS-2) STATUS

AI10 AMBIENT AIR TEMPERATURE SENSOR (T-4)

DISCHARGE SUPPLY AIR FLOWMETER (F-2)

1 1

SD-1

DI3

FILTER STATUS (DPS-1)

RETURN AIR SMOKE DETECTOR (SD-1) STATUS

OUTSIDE AIR FAN VFD SPEED

HOT WATER CONTROL VALVE (V-1)

AO1

AO2

DO1

DO2

OUTSIDE AIR FAN START/STOP

CHILLED WATER CONTROL VALVE (V-2)

SUPPLY FAN VFD SPEED

AO3

AO4

SUPPLY FAN START/STOP

DPS-2

DI6

AIR

FILTER

AI9

F-2

SPS-2

DI7

45-AHU-08 CONTROL SCHEMATIC

& SEQUENCE

45 WLP NMT

M45-207

KEYNOTES:

EXISTING TEMPERATURE ELEMENT IS LAYING

IN BOTTOM OF AHU. SECURELY AND

PERMANENTLY REINSTALL EXISTING

TEMPERATURE ELEMENT.

NOTES:

1. ALL DEVICES ARE EXISTING DDC. SENSOR, ACTUATORS,

ETC. BE REUSED IF COMPATIBLE.

2. PROVIDE NEW CONTROLLER. CONNECT NEW

CONTROLLER TO EXISTING ELECTRICAL SERVICE.

STR

HWR

HWS

45-WFM-15

HWS FLOW

HWR TEMPERATURE

SEQUENCE OF OPERATION

1. OCCUPIED MODE

1.1. STEAM CONTROL VALVES SHALL MODULATE TO MAINTAIN THE HOT WATER SUPPLY

TEMPERATURE AT SETPOINT.

1.2. THE HOT WATER SUPPLY TEMPERATURE RESETS INVERSELY WITH THE OUTDOOR

TEMPERATURE AS SCHEDULED: AT 30°F OA - HWS AT 180°F, AT 70°F OA - HWS AT

140°F.

1.3. STEAM HOT WATER CONVERTERS, 45-HTX-5 & 45-HTX-6, ARE 100% REDUNDANT AND

ONLY ONE UNIT AT A TIME WILL OPERATE.

1.4. HOT WATER PUMPS ARE CONTROLLED BY THE DDC SYSTEM. THE PUMPS ARE 100%

REDUNDANT REQUIRING ONLY ONE PUMP AT A TIME TO OPERATE. THE LEAD/LAG

WATER PUMPS AND HEAT EXCHANGERS ARE SEQUENCED BY THE DDC SYSTEM TO

CHANGE EVERY 7 DAYS. IN THE EVENT A PUMP FAILS TO START IN 30 SECONDS OR

NO FLOW CONDITION AT THE HEAT EXCHANGER, AN ALARM IS GENERATED, AND THE

SECOND PUMP/EXCHANGER STARTS AUTOMATICALLY.

2. UNOCCUPIED MODE

2.1. IF THE OUTSIDE AIR TEMPERATURE IS BELOW 40°F (ADJUSTABLE) THE DDC SYSTEM

WILL PLACE THE HWS IN OCCUPIED MODE TO START PUMPS AND ACTUATE STEAM

VALVES TO MAINTAIN SETPOINT AS NEEDED BY THE RESET SCHEDULE.

3. VALVE SEQUENCE FOR LEAD HEAT EXCHANGER

3.1. AFTER THE FLOW THROUGH THE HEAT EXCHANGER HAS BEEN CONFIRMED VIA THE

FLOW SWITCH, THE DDC CONTROLLER WILL RECEIVE AN INPUT AND THE 24VAC

POWER WILL BE APPLIED TO THE STEAM VALVE ACTUATORS. THE STEAM VALVES

SHALL OPERATE IN THREE MODES OF CONTROL.

3.2. FIRST MODE: THE 13 CAPACITY STEAM VALVE MODULATES TO MAINTAIN THE ACTIVE

SETPOINT. AFTER THE 13 VALVE HAS REACHED 100% CAPACITY FOR 5 MINUTES, THE

SECOND MODE WILL BE ENABLED.

3.3. SECOND MODE: THE 13 VALVE IS COMMANDED TO CLOSE AND THE 2

3 CAPACITY

STEAM VALVE MODULATES TO MAINTAIN SETPOINT. AFTER THE 2

3 VALVE HAS

REACHED 100% CAPACITY FOR 5 MINUTES, THE THIRD MODE WILL BE ENABLED.

3.4. THIRD MODE: THE 13 VALVE WILL BE RE-ENABLED, AND BOTH STEAM VALVES

MODULATE TOGETHER TO MAINTAIN SETPOINT.

3.5. AS DEMAND REDUCES, THE MODES WILL BE DISABLED AT 40% COMMANDED VALVE

(DIFFERENTIAL OF 60%), AND A 5 MINUTE DELAY WILL BE ACTIVATED BETWEEN

MODES. UPON A LOSS OF FLOW THE STEAM VALVES WILL BE CLOSED (HARDWIRED

AND SOFTWARE INTERLOCKS).

SEQUENCE OF OPERATION

1. OCCUPIED MODE

1.1. STEAM CONTROL VALVES SHALL MODULATE TO MAINTAIN THE HOT WATER SUPPLY

TEMPERATURE AT SETPOINT.

1.2. THE HOT WATER SUPPLY TEMPERATURE RESETS INVERSELY WITH THE OUTDOOR

TEMPERATURE AS SCHEDULED: AT 30°F OA - HWS AT 180°F, AT 70°F OA - HWS AT 140°F.

1.3. STEAM HOT WATER CONVERTERS, 45-HTX-1 & 45-HTX-2, ARE 100% REDUNDANT AND

ONLY ONE UNIT AT A TIME WILL OPERATE.

1.4. HOT WATER PUMPS ARE CONTROLLED BY THE DDC SYSTEM. THE PUMPS ARE 100%

REDUNDANT REQUIRING ONLY ONE PUMP AT A TIME TO OPERATE. THE LEAD/LAG

WATER PUMPS AND HEAT EXCHANGERS ARE SEQUENCED BY THE DDC SYSTEM TO

CHANGE EVERY 7 DAYS. IN THE EVENT A PUMP FAILS TO START IN 30 SECONDS OR NO

FLOW CONDITION AT THE HEAT EXCHANGER, AN ALARM IS GENERATED, AND THE

SECOND PUMP/EXCHANGER STARTS AUTOMATICALLY.

2. UNOCCUPIED MODE

2.1. IF THE OUTSIDE AIR TEMPERATURE IS BELOW 40°F (ADJUSTABLE) THE DDC SYSTEM

WILL PLACE THE HWS IN OCCUPIED MODE TO START PUMPS AND ACTUATE STEAM

VALVES TO MAINTAIN SETPOINT AS NEEDED BY THE RESET SCHEDULE.

3. VALVE SEQUENCE FOR LEAD HEAT EXCHANGER

3.1. AFTER THE FLOW THROUGH THE HEAT EXCHANGER HAS BEEN CONFIRMED VIA THE

FLOW SWITCH, THE DDC CONTROLLER WILL RECEIVE AN INPUT AND THE 24VAC

POWER WILL BE APPLIED TO THE STEAM VALVE ACTUATORS. THE STEAM VALVES

SHALL OPERATE IN THREE MODES OF CONTROL.

3.2. FIRST MODE: THE 13 CAPACITY STEAM VALVE MODULATES TO MAINTAIN THE ACTIVE

SETPOINT. AFTER THE 13 VALVE HAS REACHED 100% CAPACITY FOR 5 MINUTES, THE

SECOND MODE WILL BE ENABLED.

3.3. SECOND MODE: THE 13 VALVE IS COMMANDED TO CLOSE AND THE 2

3 CAPACITY STEAM

VALVE MODULATES TO MAINTAIN SETPOINT. AFTER THE 2

3 VALVE HAS REACHED 100%

CAPACITY FOR 5 MINUTES, THE THIRD MODE WILL BE ENABLED.

3.4. THIRD MODE: THE 13 VALVE WILL BE RE-ENABLED, AND BOTH STEAM VALVES

MODULATE TOGETHER TO MAINTAIN SETPOINT.

3.5. AS DEMAND REDUCES, THE MODES WILL BE DISABLED AT 40% COMMANDED VALVE

(DIFFERENTIAL OF 60%), AND A 5 MINUTE DELAY WILL BE ACTIVATED BETWEEN MODES.

UPON A LOSS OF FLOW THE STEAM VALVES WILL BE CLOSED (HARDWIRED AND

SOFTWARE INTERLOCKS).

TEMPERATURE

SENSOR (TYP)

AI5

T

AI6

DI1

FTFS

T

AI7

DO1

DI3

DO2

DI4

STEAM CONV.

TO COND. PUMP

TO COND. PUMP

STEAM

SUPPLY

STEAM

SUPPLY

STEAM CONV.

AI2

45-HTX-6 VALVE 2

3 VALVE OUTPUT

45-HTX-6 VALVE 1

3 VALVE OUTPUT

DI2

FS

45-HTX-5 VALVE 2

3 VALVE OUTPUT

45-HTX-5 VALVE 1

3 VALVE OUTPUT

T

AI8

AMBIENT AIR

TEMPERATURE SENSOR

INSTALLED ON NORTH

SIDE OF BUILDING 180 160 140

HOT WATER SETPOINT

(DEG F)

OUTDOOR

AIR

TEMPERATURE

(DEG F)

HEATING HOT WATER RESET

SCHEDULE

AI2

AI1

AI3

AI4

AI6

AI7

AI5

AI8

STEAM CONVERTER (45-HTX-5) VALVE 2 STATUS

STEAM CONVERTER (45-HTX-6) VALVE 2 STATUS

STEAM CONVERTER (45-HTX-6) VALVE 1 STATUS

HOT WATER SUPPLY TEMPERATURE SENSOR

HOT WATER SUPPLY FLOWMETER (45-WFM-15)

HOT WATER RETURN TEMPERATURE SENSOR

STEAM CONVERTER (45-HTX-5) VALVE 1 STATUS

DI4

DI3

DI1

STEAM CONVERTER (45-HTX-6) FLOW SWITCH STATUS

HOT WATER PUMP (45-HWP-5) STATUS

HOT WATER PUMP (45-HWP-6) STATUS

STEAM CONVERTER (45-HTX-5) FLOW SWITCH STATUS

DI2

STR

AO2

AI1

AO1

AI3

AO3

AI4

AO4

DO1

DO2

HOT WATER PUMP (45-HWP-5) START/STOP

HOT WATER PUMP (45-HWP-6) START/STOP

AO1

AO2

STEAM CONVERTER (45-HTX-5) VALVE 2 CONTROLLER

STEAM CONVERTER (45-HTX-5) VALVE 1 CONTROLLER

AO3

AO4

STEAM CONVERTER (45-HTX-6) VALVE 2 CONTROLLER

STEAM CONVERTER (45-HTX-6) VALVE 1 CONTROLLER

AMBIENT AIR TEMPERATURE SENSOR

HWR

HWS

45-WFM-16

HWS FLOW

HWR TEMPERATURE

TEMPERATURE

SENSOR (TYP)

AI5

T

AI6

DI1

FTFS

T

AI7

STEAM CONV.

TO COND. PUMP

TO COND. PUMP

STEAM

SUPPLY

STEAM

SUPPLY

STEAM CONV.

AI2

45-HTX-2 VALVE 2

3 VALVE OUTPUT

45-HTX-2 VALVE 1

3 VALVE OUTPUT

DI2

FS

45-HTX-1 VALVE 2

3 VALVE OUTPUT

45-HTX-1 VALVE 1

3 VALVE OUTPUT

T

AI8

AMBIENT AIR

TEMPERATURE SENSOR

INSTALLED ON NORTH

SIDE OF BUILDING

180 160 140

HOT WATER SETPOINT

(DEG F)

OUTDOOR

AIR

TEMPERATURE

(DEG F)

HEATING HOT WATER RESET

SCHEDULE

AO2

AI1

AO1

AI3

AO3

AI4

AO4

AI2

AI1

AI3

AI4

AI6

AI7

AI5

AI8

STEAM CONVERTER (45-HTX-1) VALVE 2 STATUS

STEAM CONVERTER (45-HTX-2) VALVE 2 STATUS

STEAM CONVERTER (45-HTX-2) VALVE 1 STATUS

HOT WATER SUPPLY TEMPERATURE SENSOR

HOT WATER SUPPLY FLOWMETER (45-WFM-16)

HOT WATER RETURN TEMPERATURE SENSOR

STEAM CONVERTER (45-HTX-1) VALVE 1 STATUS

DI4

DI3

DI1

STEAM CONVERTER (45-HTX-2) FLOW SWITCH STATUS

HOT WATER PUMP (45-HWP-1) STATUS

HOT WATER PUMP (45-HWP-2) STATUS

STEAM CONVERTER (45-HTX-1) FLOW SWITCH STATUS

DI2

DO1

DO2

HOT WATER PUMP (45-HWP-1) START/STOP

HOT WATER PUMP (45-HWP-2) START/STOP

AO1

AO2

STEAM CONVERTER (45-HTX-1) VALVE 2 CONTROLLER

STEAM CONVERTER (45-HTX-1) VALVE 1 CONTROLLER

AO3

AO4

STEAM CONVERTER (45-HTX-2) VALVE 2 CONTROLLER

STEAM CONVERTER (45-HTX-2) VALVE 1 CONTROLLER

AMBIENT AIR TEMPERATURE SENSOR

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

NOTES:

1. ALL DEVICES ARE EXISTING DDC. SENSORS,

ACTUATORS, ETC MAY BE REUSED IF

FUNCTIONAL AND COMPATIBLE.

2. PROVIDE NEW CONTROLLER. CONNECT NEW

CONTROLLER TO EXISTING ELECTRICAL

SERVICE.

STR

DO1

DI3

DO2

DI4

STR

HHW SYSTEMS 1 & 2 CONTROL

SCHEMATICS & SEQUENCES

45 WLP NMT

M45-208

NOTES:

1. ALL DEVICES ARE EXISTING DDC. SENSORS,

ACTUATORS, ETC MAY BE REUSED IF

FUNCTIONAL AND COMPATIBLE.

2. PROVIDE NEW CONTROLLER. CONNECT NEW

CONTROLLER TO EXISTING ELECTRICAL

SERVICE.

HWS

HWR

SEQUENCE OF OPERATION

1. GENERAL

1.1. THE HOT WATER SYSTEM CONSISTS OF HOT WATER PUMPS WITH INDIVIDUAL

VARIABLE FREQUENCY DRIVES (VFD) AND TWO STEAM HEAT EXCHANGERS. THE

SYSTEM IS DDC CONTROLLED WITH ELECTRIC ACTUATION.

1.2. THE SYSTEM IS ON WHEN ANY HOT WATER COIL CALLS FOR HEATING.

2. OCCUPIED MODE

2.1. ONCE FLOW IS PROVEN BY THE FLOW SWITCH AT THE CONVERTER, STEAM CONTROL

VALVES SHALL MODULATE TO MAINTAIN THE HOT WATER SUPPLY TEMPERATURE AT

SETPOINT.

2.2. THE HOT WATER SUPPLY TEMPERATURE RESETS INVERSELY WITH THE OUTDOOR

TEMPERATURE AS SCHEDULED: AT 30°F OA - HWS AT 180°F, AT 70°F OA - HWS AT

140°F.

2.3. STEAM HOT WATER CONVERTERS ARE 100% REDUNDANT AND ONLY ONE UNIT AT A

TIME WILL OPERATE.

2.4. HOT WATER PUMPS ARE CONTROLLED BY THE DDC SYSTEM. THE PUMPS ARE 100%

REDUNDANT REQUIRING ONLY ONE PUMP AT A TIME TO OPERATE. THE LEAD/LAG

WATER PUMPS AND HEAT EXCHANGERS ARE SEQUENCED BY THE DDC SYSTEM TO

CHANGE EVERY 7 DAYS. IN THE EVENT A PUMP FAILS TO START IN 30 SECONDS OR

NO FLOW CONDITION AT THE HEAT EXCHANGER, AN ALARM IS GENERATED, AND THE

SECOND PUMP/EXCHANGER STARTS AUTOMATICALLY.

3. UNOCCUPIED MODE

3.1. IF THE OUTSIDE AIR TEMPERATURE IS BELOW 40°F (ADJUSTABLE) THE DDC SYSTEM

WILL PLACE THE HWS IN OCCUPIED MODE TO START PUMPS AND ACTUATE STEAM

VALVES TO MAINTAIN SETPOINT AS NEEDED BY THE RESET SCHEDULE.

TEMPERATURE

SENSOR (TYP)

AI3

T

AI4

DI1

FTFS

STEAM CONV.

TO COND. PUMP

TO COND. PUMP

STEAM

SUPPLY

STEAM

SUPPLY

STEAM CONV.

AI1

DI2

FS

T

AI6

AMBIENT AIR

TEMPERATURE SENSOR

INSTALLED ON NORTH

SIDE OF BUILDING 180 160 140

HOT WATER SETPOINT

(DEG F)

OUTDOOR

AIR

TEMPERATURE

(DEG F)

HEATING HOT WATER RESET

SCHEDULE

AO1

AI2

AO2

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

1 EXISTING DDC DEVICE TO BE REUSED

IF FUNCTIONAL AND COMPATIBLE.

2 NEW DDC DEVICE TO BE INSTALLED.

KEYNOTES

AI2

AI1

AI3

AI4

AI6

AI5

STEAM CONVERTER VALVE STATUS

HOT WATER SUPPLY TEMPERATURE SENSOR

HOT WATER SUPPLY FLOWMETER

HOT WATER SUPPLY TEMPERATURE SENSOR

DI4

DI3

DI1

STEAM CONVERTER FLOW SWITCH STATUS

HOT WATER PUMP (45-P-9) STATUS

HOT WATER PUMP (45-P-10) STATUS

STEAM CONVERTER FLOW SWITCH STATUS

DI2

DO1

DO2

HOT WATER PUMP (45-P-9) START/STOP

HOT WATER PUMP (45-P-10) START/STOP

AO1

AO2

AMBIENT AIR TEMPERATURE SENSOR

STEAM CONVERTER VALVE STATUS

STEAM CONVERTER VALVE CONTROLLER

STEAM CONVERTER VALVE CONTROLLER

T

AI5

STR

DO1

DI3

DI4

STR

DO2

SEQUENCE OF OPERATION

1. GENERAL

1.1. THE EXISTING CHILLED WATER SUPPLY FROM THE CENTRAL

COOLING PLANT PROVIDES CHILLED WATER TO THE VFD

SECONDARY PUMPING SYSTEM AT BUILDING 45. THE

SECONDARY PUMPS ARE 100% REDUNDANT REQUIRING ONLY

ONE PUMP AT A TIME TO OPERATE.

1.2. UPON A CALL FOR COOLING FROM ANY AIR HANDLER, FAN COIL,

OR BLOWER COIL, THE LEAD CHILLED WATER PUMP SHALL

ENERGIZE AND THE RESPECTIVE VFD SHALL MODULATE THE

PUMP TO MAINTAIN THE PRESSURIZATION SETPOINT

(ADJUSTABLE) AT THE DIFFERENTIAL PRESSURE SENSOR

LOCATED 3 4 OF THE WAY DOWN THE LONGEST PIPING RUN. THE

VFD WILL MODULATE AS REQUIRED TO MAINTAIN THE SYSTEM

PRESSURE SETPOINT.

1.3. CHILLED WATER DIFFERENTIAL SETPOINT SHALL BE RESET

BASED ON CHILLED WATER VALVE POSITIONS TO MINIMIZE

PUMP SPEED.

1.4. A HYDRONIC BRIDGE CIRCUIT DOWNSTREAM OF THE 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 FLOW SHUT OFF AS COOLING LOAD DICTATES. MANUAL

BALANCING VALVES SHALL BE SET AS A PRESSURE DROP TO

MATCH REMAINDER OF BUILDING PIPING CIRCUIT AT MIN.