36C25618U0323-0002013.pdf

EXIST

FCU#6-2

EXIST

V6-2-23

EXIST

V6-2-24

EXIST

V6-2-27

EXIST

V6-1-35

EXIST

V6-1-34

EXIST

V6-1-33

EXIST

V6-1-32

EXIST

V6-1-30 EXIST

V6-1-29

EXIST

V6-1-28

EXIST

V6-1-27

EXIST

V6-1-31

EXIST

V6-2-25

EXIST

V6-2-26

EXIST

FCU#6-3

EXIST

FCU#6-1

EXIST BCU#6-1

EXIST

6-CWP-2

EXIST

6-CWP-1

EXIST VFD'S FOR

6-CWP-1 & 6-CWP-2

M

EXIST DDC'S

EXIST EF#6-1

EXIST CP#6-1

EXIST

6-HWP-2

EXIST

6-HWP-1

6-HX-1 & 6-HX-2

NOTES:

1. EXISTING DDC SYSTEM IS JCI. REPLACE CONTROLLERS TO

FULLY INTEGRATE TO CAMPUS SIEMENS SYSTEM.

2. CONNECT NEW DDC CONTROLLERS TO EXISTING ELECTRICAL

SERVICE.

VAV TERMINAL

UNIT (TYP.)

EXIST MAIN ELEC PANEL

FOR HVAC EQUIP.

PROVIDE ELEC METER FOR HVAC PANEL.

CONNECT TO CAMPUS DDC CONTRTOL

SYSTEM. PROVIDE NEW ELECTRICAL

METERS. CONTRACTOR SHALL PROVIDE

120V POWER CONNECTION TO NEW

ELECTRICAL METERS. CONTRACTOR SHALL

ROUTE TO NEAREST 120V PANEL WITH

SPARE CAPACITY, INSTALL NEW 20 A-1

POLE CIRCUIT BREAKER, & MAKE

CONNECTION. PROVIDE 20 A SWAP SWITCH

AT ELECTRICAL METERS FOR DISCONNECT.

CONTRACTOR TO VERIFY 120V PANEL

LOCATION DURING PRE-BID

WALKTHROUGH.

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

BASEMENT FLOOR PLAN -

MECHANICAL

6 WLP NMT

M6-100 10-30-13

V6-1-18

EXIST

V6-1-14

EXIST

V6-1-15

EXIST

V6-1-16

EXIST

V6-1-17

EXIST

V6-1-19

EXIST

V6-1-20

EXIST

V6-1-22

EXIST

V6-1-21

EXIST

V6-1-23

EXIST

V6-1-24

EXIST

V6-1-25EXIST

V6-1-26

EXIST

V6-2-22EXIST

V6-2-19

EXIST

V6-2-17

EXIST

V6-2-18

EXIST

V6-2-21

EXIST

V6-2-20

EXIST

V6-2-16

EXIST

V6-2-15

EXIST

V6-2-14

EXIST

V6-2-13

EXIST

V6-2-12

NOTES:

1. EXISTING DDC SYSTEM IS JCI. REPLACE CONTROLLERS TO

FULLY INTEGRATE TO CAMPUS SIEMENS SYSTEM.

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

1ST FLOOR PLAN - MECHANICAL

6 WLP NMT

M6-101

V6-1-1

EXIST

V6-1-2

EXIST

V6-1-3

EXIST

V6-1-4

EXIST

V6-1-6EXIST

V6-1-7

EXIST

V6-1-9

EXIST

V6-1-10

EXIST

V6-2-13EXIST

V6-2-11

EXIST

V6-2-10

EXIST

V6-2-9

EXIST

V6-2-6

EXIST

V6-2-8

EXIST

V6-2-7

EXIST

V6-2-4

EXIST

V6-2-2

EXIST

V6-2-1

EXIST

V6-2-3

EXIST

V6-2-5

EXIST

V6-1-12

EXIST

V6-1-11

EXIST

V6-1-8

EXIST

V6-1-5

NOTES:

1. EXISTING DDC SYSTEM IS JCI. REPLACE CONTROLLERS TO

FULLY INTEGRATE TO CAMPUS SIEMENS SYSTEM.

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

2ND FLOOR PLAN - MECHANICAL

6 WLP NMT

M6-102

EXIST AHU#6-1 EXIST AHU#6-2

V6-3-9

IN

ATTIC

EXIST

V6-3-8

IN

ATTIC

EXIST

V6-3-7

IN

ATTIC

EXIST

V6-3-6

IN

ATTIC

EXIST

V6-3-5

IN

ATTIC

EXIST

V6-3-4

IN

ATTIC

EXIST

V6-3-10

IN

ATTIC

EXIST

V6-3-3

IN

ATTIC

EXIST

V6-3-2

IN

ATTIC

EXIST

V6-3-1

IN

ATTIC

NOTES:

1. EXISTING DDC SYSTEM IS JCI. REPLACE CONTROLLERS TO

FULLY INTEGRATE TO CAMPUS SIEMENS SYSTEM.

EXIST PTHP#6-4

TO REMAIN ON

STANDALONE

CONTROLS.

EXIST PTHP#6-3

TO REMAIN ON

STANDALONE

CONTROLS.

EXIST PTHP#6-2

TO REMAIN ON

STANDALONE

CONTROLS.

EXIST PTHP#6-1

TO REMAIN ON

STANDALONE

CONTROLS.

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

3RD FLOOR PLAN - MECHANICAL

6 WLP NMT

M6-103

V6-3-10

EXIST

V6-3-4

EXIST

V6-3-5

EXIST

V6-3-3

EXIST

V6-3-2 EXIST

V6-3-1

EXIST

V6-3-9

EXIST

V6-3-6

EXIST

V6-3-7

EXIST

V6-3-8

EXIST AHU#6-3

EXIST

HWUH#6-1

EXIST

VFD

EXIST

DDC

1. EXISTING DDC SYSTEM IS JCI. REPLACE CONTROLLERS TO

FULLY INTEGRATE TO CAMPUS SIEMENS SYSTEM.

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

ATTIC FLOOR PLAN - MECHANICAL

6 WLP NMT

M6-104

SPS-4

AI14

SPS-2

DI9

SUPPLY

VFD

FAN

DO3

AO3

DI8

AI11

COIL

L P

S

V-1

NO

PREHEAT

AI5

AO1

DI7DI2

D02DO1

DI1

SPS-1

AI3

SUPPLY

PANEL

DDC CONTROL

AI4

T-2

T-1

OUTSIDE AIR

D-1

AI2

D-2

T-8T

AI15

NOTES:

1. ALL CONTROL DEVICES ARE EXISTING DDC. SENSOR, VALVES,

ETC CAN BE REUSED IF FUNCTIONAL AND COMPATIBLE.

2. DDC CONTROLLER TO BE REPLACED. CONNECT NEW

CONTROLLER TO EXISTING ELECTRICAL SERVICE.

DI5

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)

RETURN AIR GROUND & 1ST FLOORS FLOWMETER (F-3)

RETURN AIR 2ND & 3RD FLOORS FLOWMETER (F-2)

SUPPLY FAN VFD STATUS

SUPPLY AIR STATIC PRESSURE SENSOR (SPS-3)

SUPPLY AIR TEMPERATURE SENSOR (T-7)

DISCHARGE AIR STATIC PRESSURE SENSOR (SPS-4)

AMBIENT AIR TEMPERATURE SENSOR (T-8)

DI10

DI11

RETURN AIR FROM

1ST & GROUND

FLOORS

RETURN AIR FROM

2ND FLOORS

FLOWMETER

H-1

AI6

T-3

T-4

C W

R

COIL

CLG

V-2

NC

AI7

AO2

DI10

T-6

AI12

T-7

DPS-2

DI4

DPS-1

DI3AI1

AI9

AI10

F-1

F-2

F-3

AIR

FILTER

SD-1

DI11

SD-2

DI6

SMOKE DAMPER

SMOKE DAMPER

AI8

T-5

T

SPS-3

AI13

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 SHALL 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 5000 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-7, IN THE DISCHARGE 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 A DUCT HUMIDITY SENSOR, H-1, SHALL MEASURE THE RETURN AIR HUMIDITY AT THE AHU. THE DDC WILL AVERAGE THE POSITION OF THE VAV BOX AIR VALVES AND SHALL ADJUST THE AIR TEMPERATURE UP OR DOWN TO PROVIDE THE MOST EFFICIENT SUPPLY AIR TEMPERATURE TO SATISFY VAV BOX DURING OCCUPIED OPERATION.

5.2 IF THE RETURN AIR HUMIDITY RISES ABOVE SETPOINT OF 60% (ADJUSTABLE) THE SUPPLY AIR TEMPERATURE OF THE AHU SHALL BE LOWERED TO KEEP THE RETURN AIR

HUMIDITY BELOW SETPOINT.

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 DISCHARGE 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 REST 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, 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-6, SHALL 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 SHALL STOP THE UNIT UPON SENSING HIGH DISCHARGE 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 WILL CLOSE AND THE

RETURN AIR DAMPER SHALL OPEN.

TTTTT

T

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

FILTER STATUS (DPS-1)

FILTER STATUS (DPS-2)

RETURN AIR STATIC PRESSURE SENSOR (SPS-1) STATUS

DI9

OUTSIDE AIR DAMPER (D-1) STATUS

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

LOW LIMIT TEMPERATURE SENSOR (T-4) STATUS

SUPPLY FAN STATUS

RETURN AIR SMOKE DETECTOR (SD-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

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

AHU#6-1 & AHU#6-2 CONTROL

SCHEMATIC & SEQUENCE

6 WLP NMT

M6-200

DO4

DO4 SMOKE DAMPER OPEN/CLOSE

NOTES:

1. ALL CONTROL DEVICES ARE EXISTING DDC. SENSORS,

VALVES, ETC CAN BE REUSED IF FUNCTIONAL AND

COMPATIBLE.

2. DDC CONTROLLER TO BE REPLACED. CONNECT NEW

CONTROLLER TO EXISTING ELECTRICAL SERVICE.

3. UNIT HEATER UH6-1 IS CONNECTED TO THIS CONTROL

PANEL.

SPS-4

AI14

SPS-2

DI10

SUPPLY

VFD

FAN

DO3

AO3

DI9

AI10

COIL

H W

R

V-1

NO

PREHEAT

AI6

AO1

DI8DI2

D02DO1

DI1

SPS-1

AI4

SUPPLY

PANEL

DDC CONTROL

AI5

T-2

T-1

OUTSIDE AIR

D-1

AI3

D-2

T-9

AI15

DI5

RETURN AIR

FROM 3RD

FLOOR

FLOWMETER

H-1

AI7

T-4

T-5

C W

R

COIL

CLG

V-2

NC

AI8

AO2

DI11

AI11

T-8

SPS-3

AI12

DPS-2

DI4

DPS-1

DI3AI1

AI2

F-1

F-2

AIR

FILTER

SD-1

DI12

SD-2

DI6 AI9

T-6

T-7

DI7

T-3

HWR

V-3

NO

NCC

UH6-1

UH1-TT

AI16

ZONE TEMPERATURE

AO4

AI13

AO5

DI13

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 SHALL 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 5000 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 DISCHARGE 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. A DUCT HUMIDITY SENSOR, H-1, SHALL MEASURE THE RETURN AIR HUMIDITY AT THE AHU. THE DDC WILL AVERAGE THE POSITION OF THE VAV BOX AIR VALVES AND SHALL ADJUST THE AIR TEMPERATURE UP OR DOWN TO PROVIDE THE MOST EFFICIENT SUPPLY AIR

TEMPERATURE TO SATISFY VAV BOX DURING OCCUPIED OPERATION.

5.2. IF THE RETURN AIR HUMIDITY RISES ABOVE SETPOINT OF 60% (ADJUSTABLE) THE SUPPLY AIR TEMPERATURE OF THE AHU SHALL BE

LOWERED TO KEEP THE RETURN AIR HUMIDITY BELOW SETPOINT.

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 DISCHARGE AIR SMOKE DETECTOR, SD-2, SHALL STOP THE UNIT UPON SENSING COMBUSTION PRODUCTS IN THE SYSTEM. SMOKE DETECTORS MUST BE MANUALLY REST AFTER AN ALARM CONDITION IN

ORDER FOR THE FAN TO RESTART.

6.3. A MIXED AIR TEMPERATURE SENSOR, T-3 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-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, SHALL 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 SHALL STOP THE UNIT UPON SENSING HIGH DISCHARGE 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 WILL CLOSE AND THE RETURN AIR DAMPER SHALL OPEN.

9. UNIT HEATER CONTROL

9.1. A ZONE TEMPERATURE SENSOR MOUNTED IN THE ATTIC SPACE TRANSMITS TEMPERATURE READINGS TO THE DDC SYSTEM. UPON A FALL IN ZONE TEMPERATURE BELOW SETPOINT, THE DDC SYSTEM COMMANDS THE UNIT HEATER ON AND OPENS THE UNIT HEATER CONTROL VALVE, V-3, TO ALLOW HOT WATER TO FLOW THROUGH THE UNIT'S HEATING COIL UNTIL THE ZONE HAS REACHED THE SETPOINT TEMPERATURE (ADJUSTABLE). IF THE UNIT HEATER FAILS TO OPERATE WHEN COMMANDED, AN ALARM WILL BE GENERATED

AT THE ECC, AND THE HEATING CONTROL VALVE SHALL CLOSE.

AI2

AI1

AI3

AI4

AI6

AI7

AI5

AI8

AI10

AI11

AI9

AI12

AI13

AI14

AI15

AI16

HOT WATER CONTROL VALVE (V-1)

CHILLED WATER CONTROL VALVE (V-2)

AO1

AO2

AO3

AO4

AO5

SUPPLY FAN VFD SPEED

UNIT HEATER (UH6-1) HOT WATER CONTROL VALVE (V-3)

UNIT HEATER (UH6-1) OUTPUT LEVEL

T

TTTTT

T H

OUTSIDE AIR FLOWMETER (F-1)

RETURN AIR TEMPERATURE SENSOR (T-1)

RETURN AIR HUMIDITY SENSOR (H-1)

MIXED AIR TEMPERATURE SENSOR (T-2)

6-AHU-3 HOT WATER CONTROL VALVE (V-1)

PREHEAT COIL DISCHARGE AIR TEMPERATURE SENSOR (T-4)

CHILLED WATER CONTROL VALVE (V-2)

COOLING COIL DISCHARGE AIR TEMPERATURE SENSOR (T-6)

SUPPLY FAN VFD STATUS

SUPPLY AIR TEMPERATURE SENSOR (T-7)

SUPPLY AIR STATIC PRESSURE SENSOR (SPS-3)

DISCHARGE AIR STATIC PRESSURE SENSOR (SPS-4)

UNIT HEATER (UH6-1) HOT WATER CONTROL VALVE (V-3)

AMBIENT AIR TEMPERATURE SENSOR (T-9)

ZONE TEMPERATURE SENSOR (UH1-T)

DI10

DI11

DI8

DI6

DI7

DI4

DI3

DI1

DI5

DI9

HIGH LIMIT TEMPERATURE SENSOR (T-7) STATUS

RETURN AIR DAMPER (D-2) STATUS

FILTER STATUS (DPS-1)

FILTER STATUS (DPS-2)

RETURN AIR STATIC PRESSURE SENSOR (SPS-1) STATUS

OUTSIDE AIR DAMPER (D-1) STATUS

SUPPLY FAN STATUS

LOW LIMIT TEMPERATURE SENSOR (T-3) STATUS

HIGH LIMIT TEMPERATURE SENSOR (T-5) STATUS

RETURN AIR SMOKE DETECTOR (SD-1) STATUS

DI2

RETURN AIR FLOWMETER (F-2)

T T

AMBIENT AIR

TEMPERATURE

SENSOR

DI12

DI13 UNIT HEATER (UH6-1) STATUS

SUPPLY AIR SMOKE DETECTOR (SD-2) STATUS

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

DO1

DO2

DO3

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

AHU#6-3 CONTROL SCHEMATIC

& SEQUENCE

6 WLP NMT

M6-201

STR

STEAM CONV.

TO COND. PUMP

T

AI8

HWR

HWS

SENSOR (TYP)

TEMPERATURE

TO COND. PUMP

STEAM

SUPPLY

STEAM

SUPPLY

HWR TEMPERATURE

NO

180 160 140

HOT WATER SETPOINT

(DEG F)

OUTDOOR

AIR

TEMPERATURE

(DEG F)

HEATING HOT WATER RESET

SCHEDULE

NO

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, 6-HTX-1 & 6-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 (FS-X), 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 1

3 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).

NOTES:

1. ALL CONTROL DEVICES ARE EXISTING

DDC. SENSORS, ACTUATORS, ETC CAN

BE REUSED IF FUNCTIONAL AND

COMPATIBLE.

2. DDC CONTROLLER TO BE REPLACED.

CONNECT NEW CONTROLLER TO

EXISTING ELECTRICAL SERVICE.

AI2

AI1

AI3

AI4

AI6

AI7

AI5

AI8

STEAM CONVERTER (6-HTX-1) VALVE 2 STATUS

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

STEAM CONVERTER (6-HTX-2) VALVE 1 STATUS

HOT WATER SUPPLY TEMPERATURE SENSOR

HOT WATER SUPPLY FLOWMETER

HOT WATER RETURN TEMPERATURE SENSOR

AMBIENT AIR TEMPERATURE SENSOR

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

T

T

STEAM CONV.

6-HTX-1 VALVE 2

3 VALVE OUTPUT

6-HTX-1 VALVE 1

3 VALVE OUTPUT

6-HTX-2 VALVE 2

3 VALVE OUTPUT

6-HTX-2 VALVE 1

3 VALVE OUTPUT

AI5

AI6

AI7

DI1

DI2

DI3

DO1

DI4

DO2

STR

AMBIENT AIR

TEMPERATURE SENSOR

INSTALLED ON NORTH

SIDE OF BUILDING

DI4

DI3

DI1

STEAM CONVERTER (6-HTX-2) FLOW SWITCH STATUS

HOT WATER PUMP (6-HWP-1) STATUS

HOT WATER PUMP (6-HWP-2) STATUS

STEAM CONVERTER (6-HTX-1) FLOW SWITCH STATUS

DI2

DO1

DO2

HOT WATER PUMP (6-HWP-1) START/STOP

HOT WATER PUMP (6-HWP-2) START/STOP

FT

FS

FS

VFD

6-CHWP-1

6-CHWP-2

CAMPUS

CHWS

CAMPUS

CHWR

BLDG 6

CHWS

BLDG 6

CHWR

P

LOCATED 3 4 DOWN LONGEST

RUN.

FT

T

AI19

H

AI18

AMBIENT AIR TEMPERATURE

& HUMIDITY SENSOR

INSTALLED ON NORTH SIDE

OF BUILDING

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 6. 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. 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. FLOW. CHILLED WATER FLOWS WILL BE MEASURED AND TOTALLIZED BY HIGH ACCURACY FLOWMETERS AT EACH PUMP DISCHARGE, HYDRONIC BRIDGE BYPASS, AND COMMON SECONDARY CHW SUPPLY.

2. LEAD/STANDBY PUMP CONTROL

2.1. IF THE LEAD BUILDING SECONDARY CHILLED WATER PUMP FAILS TO OPERATE, THE STANDBY PUMP SHALL BE AUTOMATICALLY STARTED, AND THE SYSTEM SHALL RESUME NORMAL OPERATION. AN ALARM WILL BE GENERATED AT THE DDC PANEL TO NOTIFY OF PUMP FAILURE.

2.2. THE LEAD/STANDBY STATUS OF THE PUMPS SHALL BE ROTATED EVERY 7 DAYS FOR EVEN RUNTIME.

AI2

AI1

AI3

AI4

AI6

AI7

AI5

AI8

AI9

CAMPUS CHILLED WATER SUPPLY PRESSURE SENSOR

CAMPUS CHILLED WATER SUPPLY FLOWMETER (6-WFM-11)

EMERGENCY BYPASS TEMPERATURE SENSOR

EMERGENCY BYPASS FLOWMETER (6-WFM-12)

CAMPUS CHILLED WATER RETURN TEMPERATURE

CHILLED WATER PUMP (6-CHWP-1) VFD STATUS

CHILLED WATER PUMP (6-CHWP-2) VFD STATUS

6-CHWP-1 DISCHARGE FLOWMETER (6-FWM-13)

CAMPUS CHILLED WATER SUPPLY TEMPERATURE SENSOR

AI13

AI12

AI10

BUILDING 6 CHILLED WATER SUPPLY PRESSURE SENSOR

BUILDING 6 CHILLED WATER SUPPLY TEMPERATURE SENSOR

BUILDING 6 CHILLED WATER SUPPLY FLOWMETER (6-WFM-17)

6-CHWP-1 DISCHARGE FLOWMETER (6-FWM-14)

AI11

TPTP FT

VFD

DO1

DI1

AO1

AI7

FT

F T

AI1 AI2 AI3

AI5

AI6

AI10

AI9

AI11 AI12 AI13

AI4 AI14

F

T AI15

TT

AI16

AI17

FT

AI14 HYDRONIC BYPASS BRIDGE TEMPERATURE SENSOR

AI17

AI16

HYDRONIC BYPASS BRIDGE FLOWMETER (6-WFM-15)

BUILDING 6 CHILLED WATER RETURN TEMPERATURE SENSOR

DIFFERENTIAL PRESSURE SENSOR

AI15

AI18 AMBIENT AIR HUMIDITY SENSOR

DO2

DI2

AO2

AI8

6-WFM-176-WFM-11

6-WFM-12

6-WFM-13

6-WFM-14

AI19 AMBIENT AIR TEMPERATURE SENSOR

6-WFM-15

TT

DI1

CHILLED WATER PUMP (6-CHWP-2) STATUS

CHILLED WATER PUMP (6-CHWP-1) STATUS

DI2

DO1

DO2

CHILLED WATER PUMP (6-CHWP-1) START/STOP

CHILLED WATER PUMP (6-CHWP-2) START/STOP

AO1

AO2

CHILLED WATER PUMP (6-CHWP-1) VFD SPEED

CHILLED WATER PUMP (6-CHWP-2) VFD SPEED

AO1

AO2

STEAM CONVERTER (6-HTX-1) VALVE 2 CONTROLLER

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

AI2

AO2

AI1

AO1

AI3

AO3

AI4

AO4

AO3

AO4

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

STEAM CONVERTER (6-HTX-2) VALVE 1 CONTROLLER

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

HEATING HOT WATER & SCHW

SYSTEMS CONTROL SCHEMATICS

& SEQUENCES

6 WLP NMT

M6-202

NOTES:

1. ALL CONTROL DEVICES ARE EXISTING

DDC. SENSORS, ACTUATORS, ETC CAN

BE REUSED IF FUNCTIONAL AND

COMPATIBLE.

2. DDC CONTROLLER TO BE REPLACED.

CONNECT NEW CONTROLLER TO

EXISTING ELECTRICAL SERVICE.

COIL

H W

R

V-1

NC

HTG

AI3

AO1

PANEL

DDC CONTROL

AI4

T-1

AI2

NOTES:

1. ALL CONTROL DEVICES ARE

EXISTING DDC. SENSORS &

ACTUATORS CAN BE

REUSED IF FUNCTIONAL

AND COMPATIBLE.

2. CONTROLLER AND SPACE

TEMPERATURE SENSOR TO

BE REPLACED.

SUPPLY

STR

FAN

DO1

DI4

COIL

H W

R

V-1

NO

HTG

AI1

AO1

T

DI3

RETURN AIR

T-2

C W

R

COIL

CLG

V-2

NC

AI2

AO2

AI3

T-3

DPS-1

DI2

PANEL

DDC CONTROL

SUPPLY AIR

DI1

T-1

NOTES:

1. ALL CONTROL DEVICES

ARE EXISTING DDC.

SENSORS, AND

ACTUATORS CAN BE

REUSED IF FUNCTIONAL

AND COMPATIBLE.

2. CONTROLLER AND SPACE

TEMPERATURE SENSOR

TO BE REPLACED.

3. TYPICAL OF 3 UNITS.

AO2

FLOWMETER

AI1

F-1

T-4T

AI4

SPACE TEMPERATURE

SENSOR

T-2

AI5

SPACE TEMPERATURE SENSOR

SEQUENCE OF OPERATION

1. START/STOP CONTROL

1.1. THE BLOWER COIL WILL OPERATE ON A SCHEDULE AS SET BY THE ECC. THE UNIT FAN WILL BE

STARTED AND STOPPED BY THE DDC SYSTEM THROUGH THE ECC. THE CONTROL LOOPS ARE

ENERGIZED WHEN FAN RUN STATUS IS PROVEN BY THE CURRENT SENSING RELAY. STOPPING THE

UNIT WILL DE-ENERGIZE THE CONTROL LOOPS AND SEND THE HOT WATER AND CHILLED WATER

CONTROL VALVES TO THE CLOSED POSITION.

2. TEMPERATURE CONTROL

2.1. A ZONE TEMPERATURE SENSOR SENDS TEMPERATURE INFORMATION TO THE DDC SYSTEM. THE DDC SYSTEM THEN MODULATES THE CHILLED WATER AND HOT WATER CONTROL VALVES, V-2 AND

V-1 RESPECTIVELY, IN SEQUENCE TO MAINTAIN ZONE TEMPERATURE SETPOINT.

2.2. UPON A RISE IN ZONE TEMPERATURE, THE CHILLED WATER VALVE WILL MODULATE OPEN TO

MAINTAIN ZONE TEMPERATURE SETPOINT OF 75°F (ADJUSTABLE).

2.3. IF THE ZONE TEMPERATURE FALLS BELOW 70°F SETPOINT (ADJUSTABLE), THE HOT WATER VALVE

WILL MODULATE OPEN TO MAINTAIN ZONE SETPOINT.

2.4. IF THE UNIT FAILS TO OPERATE BETWEEN THE RANGE OF 70-75°F (ADJUSTABLE), AN ALARM MESSAGE WILL BE SENT TO THE ECC, AND BOTH CHILLED AND HOT WATER CONTROL VALVES WILL

CLOSE.

3. SYSTEM SAFETIES

3.1. HIGH LIMIT THERMOSTAT, T-1, IN THE RETURN AIR PATH WILL STOP THE UNIT UPON DETECTION OF

TEMPERATURE ABOVE ITS SETPOINT OF 125°F.

3.2. LOW LIMIT THERMOSTAT, T-2, LOCATED BEFORE THE CHILLED WATER COILS WILL STOP THE UNIT

UPON DETECTION OF AIR TEMPERATURE BELOW ITS SETPOINT OF 35°F.

3.3. FILTER STATUS WILL BE MONITORED BY A DIFFERENTIAL PRESSURE SENSOR, DPS-1, AT THE FILTER

BANK.

SEQUENCE OF OPERATION

1. OCCUPIED MODE

1.1. THE ZONE TEMPERATURE SENSOR, T-2, TRANSMITS READINGS TO THE VAV CONTROLLER WHICH IN TURN MODULATES THE PRIMARY AIRFLOW VAV DAMPER, D-1, AND REHEAT CONTROL VALVE, V-1, TO

MAINTAIN SPACE TEMPERATURE SETPOINTS (ADJUSTABLE).

1.2. UPON A RISE IN ZONE TEMPERATURE ABOVE SETPOINT, THE VAV BOX CONTROLLER MODULATES

THE PRIMARY AIRFLOW VAV DAMPER TO MAX. CFM SETPOINT.

1.3. A DROP IN SPACE TEMPERATURE SETPOINT SIGNALS THE VAV TO MODULATE THE PRIMARY

AIRFLOW VAV DAMPER TO THE MIN. CFM SETPOINT. A FURTHER DROP IN ZONE TEMPERATURE

SIGNALS THE VMA TO MODULATE THE VAV BOX REHEAT CONTROL VALVE OPEN TO HEAT THE ZONE

TO WITHIN +/- 0.5°F OF SETPOINT.

2. UNOCCUPIED MODE

2.1. WHEN THE SYSTEM IS INDEXED TO UNOCCUPIED MODE, THE AIR HANDLER STOPS, THE PRIMARY

AIRFLOW VAV DAMPER AND THE REHEAT CONTROL VALVE CLOSES.

2.2. IF THE ZONE TEMPERATURE FALLS BELOW THE NIGHT SETBACK SETPOINT (ADJUSTABLE), THE AIR HANDLING UNIT WILL START, THE VAV BOX DAMPER OPEN, AND THE REHEAT CONTROL VALVE WILL

MODULATE OPEN TO MAINTAIN THE UNOCCUPIED ZONE TEMPERATURE AT SETPOINT.

2.3. IF THE ZONE TEMPERATURE RISES ABOVE THE NIGHT CYCLE SETPOINT, THE AIR HANDLING UNIT

WILL START AND THE VAV BOX DAMPER WILL MODULATE OPEN TO COOL THE ZONE TO THE

UNOCCUPIED COOLING SETPOINT TEMPERATURE.

2.4. T-2 CONTAINS A PUSH BUTTON OVERRIDE TO ALLOW OCCUPANTS TO INDEX THE SYSTEM TO

OCCUPIED MODE FOR AFTER HOURS USE. THE VMA CONTROLLER WILL FUNCTION PER THE

OCCUPIED MODE OF OPERATION UNTIL THE TEMPORARY OCCUPANCY TIMER EXPIRES, AT WHICH

TIME THE VAV CONTROLLER WILL REVERT TO UNOCCUPIED MODE OF OPERATION DEPENDING ON

TIME OF DAY SCHEDULING.

3. MORNING WARM-UP MODE

3.1. WHEN INDEXED TO THE MORNING WARM-UP MODE OF OPERATION, THE DDC SYSTEM WILL SET THE

SPACE SENSOR TO ITS OCCUPIED HEATING TEMPERATURE SETPOINT (ADJUSTABLE). THE VMA

CONTROLLER WILL INDEX THE PRIMARY AIRFLOW VAV DAMPER TO 100% OPEN. THE REHEAT

CONTROL VALVE WILL OPEN AND ALLOW THE PRIMARY AIRFLOW TO HEAT THE ZONE WHEN THE

RESPECTIVE AIR HANDLER IS CYCLED TO MORNING WARM-UP MODE.

3.2. WHEN THE ZONE TEMPERATURE REACHES ITS OCCUPIED SETPOINT, THE PRIMARY AIRFLOW VAV

DAMPER AND THE REHEAT CONTROL VALVE WILL CLOSE AND THE AIR HANDLER IS STILL IN

WARM-UP MODE. AS THE AIR HANDLER IS INDEXED TO OCCUPIED MODE OF OPERATION, THE VAV

BOX WILL INDEX TO OCCUPIED MODE AS WELL.

D-1

T

T

TM

AI2

AI1

AI3

AI4

AI5

INTAKE AIR FLOWMETER

HOT WATER CONTROL VALVE (V-1)

DISCHARGE AIR TEMPERATURE SENSOR (T-1)

SPACE TEMPERATURE SENSOR (T-2)

PRIMARY AIRFLOW VAV DAMPER (D-1)

AO1

AO2

PRIMARY AIRFLOW VAV DAMPER (D-1) CONTROLLER

HOT WATER CONTROL VALVE (V-1)

AI2

AI1

AI3

AI4

HOT WATER CONTROL VALVE (V-1)

DISCHARGE AIR TEMPERATURE SENSOR (T-3)

SPACE TEMPERATURE SENSOR (T-4)

CHILLED WATER CONTROL VALVE (V-2)

AO1 HOT WATER CONTROL VALVE (V-1)

DI4

DI3

DI1

FILTER STATUS (DPS-1)

LOW LIMIT TEMPERATURE SENSOR (T-2) STATUS

SUPPLY FAN STATUS

HIGH LIMIT TEMPERATURE SENSOR (T-1) STATUS

DI2

AO2 CHILLED WATER CONTROL VALVE (V-2)

DO1 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

T

VAV TERMINAL (TYP.) & FCU (TYP.)

CONTROL SCHEMATICS &

SEQUENCES

6 WLP NMT

M6-203

SUPPLY

VFD

FAN

DO1

AO3

DI4

AI3

COIL

H W

R

V-1

HTG

AI1

AO1

DI3

RETURN AIR

T-2

C W

R

COIL

CLG

V-2

NC

AI2

AO2

AI4

T-3

DPS-1

DI2

OUTSIDE AIR

PANEL

DDC CONTROL

SUPPLY AIR

DI1

T-1

NOTES:

1. ALL CONTROL DEVICES ARE EXISTING DDC. SENSORS, ACTUATORS, ETC

CAN BE REUSED IF FUNCTIONAL AND COMPATIBLE.

2. CONTROLLER AND SPACE TEMPERATURE SENSOR TO BE REPLACED.

3. EXHAUST FAN INTERLOCKED WITH BOILER COIL UNIT.

STR

DO3

DI7

T

DI6

T-5

EF6-1 5000

CFM

DO2

DI5

D-1

NC

T-4T

AI5

SPACE TEMPERATURE

SENSOR

SEQUENCE OF OPERATION

1. START/STOP CONTROL

1.1. THE BLOWER COIL WILL OPERATE ON A SCHEDULE AS SET BY THE ECC. THE UNIT FAN WILL BE

STARTED AND STOPPED BY THE DDC SYSTEM THROUGH THE ECC. THE CONTROL LOOPS ARE

ENERGIZED WHEN FAN RUN STATUS IS PROVEN BY THE CURRENT SENSING RELAY. STOPPING THE

UNIT WILL DE-ENERGIZE THE CONTROL LOOPS AND SEND THE HOT WATER AND CHILLED WATER

CONTROL VALVES TO THE CLOSED POSITION.

1.2. EF6-1 OPERATES ONLY WHEN THE BCU IS OFF AND THE WALL MOUNTED THERMOSTAT, T-6, IS ABOVE ZONE TEMPERATURE SETPOINT 86°F (ADJUSTABLE). WHEN EF6-1 TURNS ON, THE EXHAUST AIR

DAMPER WILL OPEN. EF6-1 IS COMMANDED OFF WHEN THE ZONE TEMPERATURE REACHES

SETPOINT OR WHEN THE BCU TURNS ON. WHEN EF6-1 IS COMMANDED OFF, THE EXHAUST AIR

DAMPER WILL CLOSE.

2. TEMPERATURE CONTROL

2.1. A ZONE TEMPERATURE SENSOR SENDS TEMPERATURE INFORMATION TO THE DDC SYSTEM. THE DDC SYSTEM THEN MODULATES THE CHILLED WATER AND HOT WATER CONTROL VALVES, V-2 AND

V-1 RESPECTIVELY, IN SEQUENCE TO MAINTAIN ZONE TEMPERATURE SETPOINT.

2.2. UPON A RISE IN ZONE TEMPERATURE, THE CHILLED WATER VALVE WILL MODULATE OPEN TO

MAINTAIN ZONE TEMPERATURE SETPOINT OF 75°F (ADJUSTABLE).

2.3. IF THE ZONE TEMPERATURE FALLS BELOW 70°F SETPOINT (ADJUSTABLE), THE HOT WATER VALVE

WILL MODULATE OPEN TO MAINTAIN ZONE SETPOINT.

2.4. IF THE UNIT FAILS TO OPERATE BETWEEN THE RANGE OF 70-75°F (ADJUSTABLE), AN ALARM MESSAGE WILL BE SENT TO THE ECC, AND BOTH CHILLED AND HOT WATER CONTROL VALVES WILL

CLOSE.

3. SYSTEM SAFETIES

3.1. HIGH LIMIT THERMOSTAT, T-1, IN THE RETURN AIR PATH WILL STOP THE UNIT UPON DETECTION OF

TEMPERATURE ABOVE ITS SETPOINT OF 125°F.

3.2. LOW LIMIT THERMOSTAT, T-2, LOCATED BEFORE THE CHILLED WATER COILS WILL STOP THE UNIT

UPON DETECTION OF AIR TEMPERATURE BELOW ITS SETPOINT OF 35°F.

3.3. FILTER STATUS WILL BE MONITORED BY A DIFFERENTIAL PRESSURE SENSOR, DPS-1, AT THE FILTER

BANK.

T TT

AI2

AI1

AI3

AI4

HOT WATER CONTROL VALVE (V-1)

SUPPLY FAN VFD STATUS

DISCHARGE AIR TEMPERATURE SENSOR (T-3)

CHILLED WATER CONTROL VALVE (V-2)

AI5 SPACE TEMPERATURE SENSOR (T-4)

DI4

DI3

DI1

FILTER STATUS (DPS-1)

LOW LIMIT TEMPERATURE SENSOR (T-2) STATUS

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

DI2

DI5 EXHAUST AIR DAMPER (D-1) STATUS

SUPPLY FAN STATUS

DI6 HIGH LIMIT TEMPERATURE SENSOR (T-5) STATUS

DI7

AO1 HOT WATER CONTROL VALVE (V-1)

AO2 CHILLED WATER CONTROL VALVE (V-2)

AO3 SUPPLY FAN VFD SPEED

DO1 SUPPLY FAN START/STOP

DO2 EXHAUST AIR DAMPER (D-1) CONTROLLER

DO3 EXHAUST FAN (EF6-1) START/STOP

EXHAUST FAN (EF6-1) STATUS

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

BCU & EXHAUST FAN (TYP.)

CONTROL SCHEMATICS &

SEQUENCES & BALANCE SCHEDULES

6 WLP NMT

M6-204

SHUT-OFF VARIABLE AIR VOLUME BOX WITH HOT WATER REHEAT

LABEL AREA SERVED AHU SERVED

CFM HEATING

COIL GPMMAX. MIN.

V6-1-1 213, 2C1 AHU#6-1 650 450 1.75

V6-1-2 212 AHU#6-1 370 230 1.0

V6-1-3 211 AHU#6-1 330 225 1.0

V6-1-4 208, 209, 209A, 210 AHU#6-1 880 550 2.50

V6-1-5 213A, 214, 215 AHU#6-1 680 400 1.75

V6-1-6 216 AHU#6-1 1000 450 2.0

V6-1-7 217, 218 AHU#6-1 1100 500 2.25

V6-1-8 204, 205, 206, 2C2 AHU#6-1 960 525 2.50

V6-1-9 219, 219A AHU#6-1 1100 450 2.0

V6-1-10 238, 2C3 AHU#6-1 360 230 1.0

V6-1-11 202 AHU#6-1 640 400 1.75

V6-1-12 201 AHU#6-1 400 200 0.90

V6-1-13 220 AHU#6-1 930 430 1.75

V6-1-14 113, 113A AHU#6-1 630 325 1.50

V6-1-15 112 AHU#6-1 330 170 0.75

V6-1-16 111, 1C1 AHU#6-1 510 230 1.0

V6-1-17 108, 109, 110, 110A AHU#6-1 750 500 2.25

V6-1-18 114 AHU#6-1 420 230 1.0

V6-1-19 116 AHU#6-1 1000 400 1.75

V6-1-20 117, 118, 1C2 AHU#6-1 1160 450 1.75

V6-1-21 104, 105, 106 AHU#6-1 650 500 2.50

V6-1-22 119, 119A AHU#6-1 1150 450 1.75

V6-1-23 101, 1C3 AHU#6-1 870 550 2.25

V6-1-24 120 AHU#6-1 900 450 1.75

V6-1-25 122 AHU#6-1 300 170 0.75

V6-1-26 123 AHU#6-1 400 250 1.0

V6-1-27 14 AHU#6-1 370 370 2.0

V6-1-28 015, 016 AHU#6-1 350 230 1.0

V6-1-29 17 AHU#6-1 870 600 3.0

V6-1-30 18 AHU#6-1 930 550 2.5

V6-1-31 011, 012 AHU#6-1 220 220 1.25

V6-1-32 0C3, 008, 009, 010 AHU#6-1 1140 850 3.75

V6-1-33 020A AHU#6-1 460 340 1.50

V6-1-34 020B AHU#6-1 350 250 1.25

V6-1-35 020C AHU#6-1 220 170 0.75

V6-2-1 229, 229B AHU#6-2 2510 1350 6

V6-2-2 229A, 229C AHU#6-2 1080 500 2.25

V6-2-3 229D AHU#6-2 780 380 1.75

V6-2-4 228 AHU#6-2 950 390 1.75

V6-2-5 231, 232, 233, 234, 235 AHU#6-2 910 630 3

V6-2-6 227, 228A, 2C4 AHU#6-2 1110 500 2

V6-2-7 236 AHU#6-2 330 160 0.75

V6-2-8 237, 237A AHU#6-2 450 275 1.25

V6-2-9 225, 225A, 2C3 AHU#6-2 1310 475 2

V6-2-10 223 AHU#6-2 640 350 1.5

V6-2-11 222 AHU#6-2 430 150 0.5

V6-2-12 129, 129B AHU#6-2 2100 1160 4.5

V6-2-13 129A, 129C AHU#6-2 1020 450 2

V6-2-14 129D AHU#6-2 430 220 1

V6-2-15 129E AHU#6-2 300 170 0.75

V6-2-16 128 AHU#6-2 830 350 1.5

V6-2-17 126, 127, 1C5 AHU#6-2 1090 500 2

V6-2-18 131, 132, 133, 134, 135 AHU#6-2 800 550 2.5

V6-2-19 125, 125A, 1C3 AHU#6-2 1150 460 1.75

V6-2-20 136 AHU#6-2 340 225 1

V6-2-21 137, 137A AHU#6-2 430 210 1

V6-2-22 124 AHU#6-2 820 300 1.25

V6-2-23 004 AHU#6-2 380 310 1.5

V6-2-24 001 AHU#6-2 2100 1300 5.5

V6-2-25 005, 006, 0C3 AHU#6-2 940 700 3.25

V6-2-26 007 AHU#6-2 700 580 2.75

V6-2-27 001A AHU#6-2 300 210 1

V6-3-1 303 AHU#6-3 400 325 1.50

V6-3-2 304 AHU#6-3 400 325 1.50

V6-3-3 305 AHU#6-3 820 700 3.25

V6-3-4 309, 3C3 AHU#6-3 600 475 2.25

V6-3-5 310 AHU#6-3 300 250 1.10

V6-3-6 311 AHU#6-3 550 450 2.25

V6-3-7 300, 3C3 AHU#6-3 550 450 2.25

V6-3-8 301 AHU#6-3 500 400 2.0

V6-3-9 302 AHU#6-3 430 320 1.50

V6-3-10 306, 308 AHU#6-3 700 700 3.50

AIR HANDLING UNITS BALANCING SCHEDULE

LABEL AREA SERVED SUPPLY CFM OA CFM

COOLING

COIL GPM

PREHEAT

COIL LBS/HR

AHU#6-1

SOUTH SIDE OF BASEMENT,

1ST FLOOR, & 2ND FLOOR 24500 5000 148 570

AHU#6-2

NORTH SIDE OF BASEMENT,

1ST FLOOR, & 2ND FLOOR 24500 5000 148 570

AHU#6-3 3RD FLOOR 5250 790 30 -

FAN COIL UNITS BALANCING SCHEDULE

LABEL AREA SERVED AHU SERVED FAN CFM OA CFM

GPM

COOLING HEATING

FCU#6-1 BSMT SOUTH REAR ENTRY - 650 0 2.4 1.75

FCU#6-2 BSMT NORTH REAR ENTRY - 650 0 2.4 1.75

FCU#6-3 022 MECH SPACE - 650 0 2.4 1.75