22521.00 - Columbia Schools HVAC Upgrades - Mechanical Set - 3 of 3.pdf

1 AHU FLOW DIAGRAM

FLOW DIAGRAM: AHU-1

POINTS LIST: AHU-1

System Point Description POINTS ALARMS

NOTE: THE CONTROL POINTS FOR THE

ASSOCIATE EQUIPMENT INCLUDES, BUT IS NOT

LIMITED TO, THE FOLLOWING POINTS. THE

CONTROLS CONTRACTOR IS RESPONSIBLE

FOR PROVIDING ALL NECESSARY POINTS TO

CONTROL THE EQUIPMENT PER THE

SEQUENCE OF OPERATION.

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CONDENSATE OVERFLOW DETECTION LOCAL

CND OVRFL

X X X X

COOLING COIL LEAVING TEMPERATURE

CC LAT

X X X X X

COOLING OUTPUT COMMAND

CLG

X X

DISCHARGE AIR TEMPERATURE

DAT

X X X X X

DISCHARGE AIR STATIC PRESSURE LOCAL

DA SP

X X X X X

FILTER STATUS

FIL

X X X

HEATING OUTPUT COMMAND

HTG

X X

HIGH STATIC ALARM

HSP ALM

X X X X

HIGH STATIC ALARM INTERLOCK

HSP INTLK

X

MIXED AIR DAMPER COMMAND

MAD

X X

MIXED AIR LOW TEMPERATURE CUTOUT ALARM

MA LLT

X X

MIXED AIR TEMPERATURE LOCAL

MAT

X X X X

OUTDOOR AIR DAMPER COMMAND

OAD

X X

OUTDOOR AIR FLOW

OA FLW

X X

OUTDOOR AIR RELATIVE HUMIDITY LOCAL

OAH

X X

OUTDOOR AIR TEMPERATURE LOCAL

OAT

X X

REHEAT LEAVING COIL TEMPERATURE LOCAL

RH LAT

X X X X X

REHEAT OUTPUT COMMAND

RH

X X

RELIEF AIR FAN AIR FLOW LOCAL

RLF FLW

X X

RELIEF AIR FAN SPEED OUTPUT COMMAND

RLF

X X

RELIEF AIR FAN START STOP

RLF

X X

RETURN AIR CO2 LOCAL

RA CO2

X X X

RETURN AIR DAMPER COMMAND

RAD

X X

RETURN AIR TEMPERATURE LOCAL

RAT

X X

RETURN FAN AIR FLOW LOCAL

RAF FLW

X X

RETURN SMOKE DETECTOR INPUT

RA SD

X

SPACE TEMPERATURE LOCAL

SPT

X X X X X

SPACE TEMPERATURE SETPOINT LOCAL

SPT SP

X X

SUPPLY FAN AIR FLOW LOCAL

SF FLW

X X

SUPPLY FAN SPEED COMMAND

SAF

X X

SUPPLY FAN START STOP COMMAND

SAF

X X

SUPPLY FAN STATUS

SAF

X X

SUPPLY SMOKE DETECTOR INPUT

SA SD

X

BAS COMMUNICATION STATE

BAS COM

X X

DISCHARGE AIR COOLING SETPOINT

DA CL SP

X

DISCHARGE AIR HEATING SETPOINT

DA HT SP

X

MAINTENANCE REQUIRED

MNT REQ

X X

MIXED AIR TEMPERATURE LOW LIMIT SETPOINT

MA LLT STPT

X

OCCUPIED COOLING SETPOINT

OCC CLG STPT

X X

OCCUPIED HEATING SETPOINT

OCC HTG STPT

X X

SUPPLY FAN FAILURE

SF FAIL

X X X

UNOCCUPIED COOLING SETPOINT

UNOCC CLG STPT

X X

UNOCCUPIED HEATING SETPOINT

UNOCC HTG STPT

X X

SEQUENCE OF OPERATION: AHU-1

BUILDING AUTOMATION SYSTEM INTERFACE:

THE BUILDING AUTOMATION SYSTEM (BAS) SHALL SEND THE CONTROLLER OCCUPIED BYPASS, MORNING WARM-UP/PRE-COOL, OCCUPIED/UNOCCUPIED AND HEAT/COOL MODES. IF A BAS IS NOT PRESENT, OR COMMUNICATION IS LOST WITH THE BAS THE CONTROLLER SHALL OPERATE USING DEFAULT MODES AND

SETPOINTS.

OCCUPIED:

DURING OCCUPIED PERIODS, THE SUPPLY FAN SHALL RUN CONTINUOUSLY AND THE MIXED AIR DAMPERS SHALL

OPEN TO MAINTAIN MINIMUM VENTILATION REQUIREMENTS.

THE DX COOLING AND THE HOT WATER VALVE SHALL CONTROL TO MAINTAIN THE DISCHARGE AIR TEMPERATURE SETPOINT. IF ECONOMIZING IS ENABLED, THE OUTDOOR AIR OR MIXED AIR DAMPERS SHALL MODULATE TO MAINTAIN THE DISCHARGE AIR TEMPERATURE SETPOINT AND THE RELIEF AIR DAMPER SHALL TRACK THE MIXED AIR DAMPERS. THE DISCHARGE AIR TEMPERATURE SETPOINT SHALL BE DYNAMICALLY RESET BASED ON THE DEVIATION OF ACTUAL SPACE TEMPERATURE FROM THE ACTIVE SPACE TEMPERATURE SETPOINT. IF THE DISCHARGE AIR TEMPERATURE SENSOR FAILS, THE DX COOLING AND THE HOT WATER VALVE SHALL CONTROL TO MAINTAIN THE ACTIVE SPACE TEMPERATURE SETPOINT AND AN ALARM SHALL ANNUNCIATE AT THE BAS. IF THE DISCHARGE AIR TEMPERATURE SENSOR AND THE SPACE TEMPERATURE SENSOR FAIL, THE DX COOLING SHALL BE DISABLED, THE HOT WATER VALVE SHALL CLOSE AND AN ALARM SHALL ANNUNCIATE AT THE BAS.

UNOCCUPIED:

WHEN THE SPACE TEMPERATURE IS BELOW THE UNOCCUPIED HEATING SETPOINT OF 60.0 DEG. F (ADJ.) THE SUPPLY FAN SHALL START, THE OUTSIDE AIR DAMPER SHALL REMAIN CLOSED AND THE HOT WATER VALVE SHALL OPEN. WHEN THE SPACE TEMPERATURE RISES ABOVE THE UNOCCUPIED HEATING SETPOINT OF 60.0 DEG. F (ADJ.) PLUS THE UNOCCUPIED DIFFERENTIAL OF 4.0 DEG. F (ADJ.) THE SUPPLY FAN SHALL STOP AND THE HOT

WATER VALVE SHALL CLOSE.

WHEN THE SPACE TEMPERATURE IS ABOVE THE UNOCCUPIED COOLING SETPOINT OF 85.0 DEG. F (ADJ.) THE SUPPLY FAN SHALL START, THE OUTSIDE AIR DAMPER SHALL OPEN IF ECONOMIZING IS ENABLED AND REMAIN CLOSED IF ECONOMIZING IS DISABLED AND THE DX COOLING SHALL BE ENABLED. WHEN THE SPACE TEMPERATURE FALLS BELOW THE UNOCCUPIED COOLING SETPOINT OF 85.0 DEG. F MINUS THE UNOCCUPIED DIFFERENTIAL OF 4.0 DEG. F (ADJ.) THE SUPPLY FAN SHALL STOP, THE DX COOLING SHALL BE DISABLED AND THE

OUTSIDE AIR DAMPER SHALL CLOSE.

OPTIMAL START:

THE BAS SHALL MONITOR THE SCHEDULED OCCUPIED TIME, OCCUPIED SPACE SETPOINTS AND SPACE

TEMPERATURE TO CALCULATE WHEN THE OPTIMAL START OCCURS.

OPTIMAL STOP:

THE BAS SHALL MONITOR THE SCHEDULED UNOCCUPIED TIME, OCCUPIED SETPOINTS AND SPACE TEMPERATURE TO CALCULATE WHEN THE OPTIMAL STOP OCCURS. WHEN THE OPTIMAL STOP MODE IS ACTIVE THE UNIT CONTROLLER SHALL MAINTAIN THE SPACE TEMPERATURE TO THE SPACE TEMPERATURE OFFSET SETPOINT.

OUTSIDE AIR DAMPER SHALL REMAIN ENABLED TO PROVIDE MINIMUM VENTILATION.

OCCUPIED BYPASS:

THE BAS SHALL MONITOR THE STATUS OF THE ON AND CANCEL BUTTONS OF THE SPACE TEMPERATURE SENSOR.

WHEN AN OCCUPIED BYPASS REQUEST IS RECEIVED FROM A SPACE SENSOR, THE UNIT SHALL TRANSITION FROM ITS CURRENT OCCUPANCY MODE TO OCCUPIED BYPASS MODE AND THE UNIT SHALL MAINTAIN THE SPACE

TEMPERATURE TO THE OCCUPIED SETPOINTS (ADJ.).

HEAT/COOL MODE:

WHEN THE SPACE TEMPERATURE RISES ABOVE THE OCCUPIED COOLING SETPOINT THE MODE SHALL TRANSITION TO COOLING. WHEN THE SPACE TEMPERATURE FALLS BELOW THE OCCUPIED HEATING SETPOINT THE MODE SHALL TRANSITION TO HEATING. WHEN THE SPACE TEMPERATURE IS ABOVE THE OCCUPIED COOLING SETPOINT OR BELOW THE OCCUPIED HEATING SETPOINT THE MODE SHALL REMAIN IN ITS LAST STATE. IF THE SPACE TEMPERATURE SENSOR FAILS THE MODE SHALL REMAIN IN ITS LAST STATE AND AN ALARM SHALL ANNUNCIATE AT THE BAS. IF THE LOCAL AND COMMUNICATED SETPOINTS FAIL THE CONTROLLER SHALL DISABLE THE SUPPLY FAN

AND AN ALARM SHALL ANNUNCIATE AT THE BAS.

MORNING WARM-UP MODE:

DURING OPTIMAL START, IF THE SPACE TEMPERATURE IS BELOW THE OCCUPIED HEATING SETPOINT A MORNING WARM-UP MODE SHALL BE ACTIVATED. WHEN MORNING WARM-UP IS INITIATED THE UNIT SHALL ENABLE THE HEATING AND FAN(S). THE OUTSIDE AIR DAMPER SHALL REMAIN CLOSED. WHEN THE SPACE TEMPERATURE REACHES THE OCCUPIED HEATING SETPOINT (ADJ.), THE UNIT SHALL TRANSITION TO THE OCCUPIED MODE.

DAYTIME WARM-UP CONTROL:

DURING OCCUPIED PERIODS, WHEN THE SPACE TEMPERATURE IS BELOW THE DAYTIME WARM-UP INITIATE SETPOINT, A DAYTIME WARM-UP SEQUENCE SHALL BE ACTIVATED. THE OUTSIDE AIR DAMPER SHALL MODULATE TO MAINTAIN MINIMUM VENTILATION REQUIREMENTS, AND THE HEATING SHALL ENABLE TO MAINTAIN THE DISCHARGE AIR TEMPERATURE HEATING SETPOINT. DAYTIME WARM-UP SHALL TERMINATE WHEN THE AVERAGE

SPACE TEMPERATURE REACHES THE OCCUPIED HEATING SETPOINT.

PRE-COOL MODE:

DURING OPTIMAL START, IF THE SPACE TEMPERATURE IS ABOVE THE OCCUPIED COOLING SETPOINT, PRE-COOL MODE SHALL BE ACTIVATED. WHEN PRE-COOL IS INITIATED THE UNIT SHALL ENABLE THE FAN AND COOLING OR ECONOMIZER. THE OUTSIDE AIR DAMPER SHALL REMAIN CLOSED, UNLESS ECONOMIZING. WHEN THE SPACE TEMPERATURE REACHES OCCUPIED COOLING SETPOINT (ADJ.), THE UNIT SHALL TRANSITION TO THE OCCUPIED

MODE.

ECONOMIZER MODE:

ENABLE: OUTSIDE AIR (OA) ENTHALPY SHALL BE COMPARED WITH THE REFERENCE ENTHALPY CONTROL SETPOINT. THE ECONOMIZER SHALL ENABLE WHEN OA ENTHALPY IS 2.0 BTU/LB LESS THAN ENTHALPY CONTROL SETPOINT. THE ECONOMIZER SHALL DISABLE WHEN OA ENTHALPY IS GREATER THAN ENTHALPY CONTROL

SETPOINT.

OPERATION: WHEN ECONOMIZING IS ENABLED AND THE UNIT IS OPERATING IN THE COOLING MODE, THE ECONOMIZER DAMPER SHALL BE MODULATED BETWEEN ITS MINIMUM POSITION AND 100% TO MAINTAIN THE SPACE TEMPERATURE SETPOINT. THE ECONOMIZER DAMPER SHALL MODULATE TOWARD MINIMUM POSITION IN THE EVENT THE MIXED AIR TEMPERATURE FALLS BELOW THE LOW TEMPERATURE LIMIT SETTING.

DEMAND CONTROL VENTILATION:

USING A RETURN CO2 INPUT (LOCAL SENSOR OR NETWORK COMMUNICATED VALUE), THE CONTROLLER SHALL MONITOR AND COMPARE THE MEASURED RETURN CO2 TO THE RETURN CO2 CONCENTRATION SETPOINT (ADJ.).

WHEN THE MEASURED RETURN CO2 CONCENTRATION REACHES THE SETPOINT (ADJ.), THE OUTSIDE AIR DAMPER SHALL MODULATE OPEN INCREMENTALLY UNTIL THE RETURN AIR CO2 LEVEL IS SATISFIED OR THE OUTSIDE AIR DAMPER REACHES THE FULL OPEN POSITION. IF THE MEASURED CO2 CONCENTRATION FALLS, THE OUTSIDE AIR DAMPER SHALL MODULATE TOWARD NORMAL ECONOMIZER OPERATION. IF THE MIXED AIR TEMPERATURE DROPS BELOW THE MIXED AIR LOW LIMIT SETPOINT THE CO2 SENSOR INPUT IS OVERRIDDEN AND THE OUTSIDE AIR DAMPER WILL BE MODULATED CLOSED TO MAINTAIN THE MIXED AIR TEMPERATURE LOW LIMIT SETPOINT. WHEN THE MIXED AIR TEMPERATURE RISES ABOVE THE MIXED AIR LOW LIMIT SETPOINT, CO2 OPERATION IS RESTORED.

DISCHARGE AIR TEMPERATURE RESET CONTROL:

ON A RISE IN SPACE TEMPERATURE (+2.0 DEG. F ADJ. OR GREATER) ABOVE THE SPACE COOLING SETPOINT (74.0 DEG. F ADJ.); THE SUPPLY FAN SPEED SHALL MODULATE FROM MINIMUM (50% ADJ.) TO MAXIMUM (OR DESIGN) AIR FLOW TO MAINTAIN SPACE COOLING TEMPERATURE SETPOINT WHILE KEEPING THE DISCHARGE AIR

TEMPERATURE SETPOINT AT MINIMUM (55.0 DEG. F ADJ.).

AS SPACE TEMPERATURE DECREASES BELOW 76.0 DEG. F (SPACE COOLING SETPOINT 74.0 DEG. F + 2.0 DEG. F);

THE FAN SPEED SHALL BE LOCKED AT MINIMUM AIR FLOW AND THE DISCHARGE AIR TEMPERATURE SETPOINT

REMAINS AT MINIMUM.

WHEN SPACE TEMPERATURE DECREASES TO 75.0 DEG. F (COOLING SETPOINT OF 74.0 DEG. F ADJ. + 1.0 DEG. F) OR BELOW FOR A PERIOD OF TIME (DEFAULT 1 MIN. ADJ.); THE FAN SPEED SHALL REMAIN AT MINIMUM, THE DISCHARGE AIR TEMPERATURE SETPOINT REMAINS AT MINIMUM, AND CONTROL ENTERS INTO DISCHARGE AIR

TEMPERATURE SETPOINT RESET MODE.

AS SPACE TEMPERATURE CONTINUES TO DROP BELOW 75.0 DEG. F (SPACE TEMPERATURE COOLING SETPOINT +

1.0 DEG. F); THE FAN SPEED SHALL REMAIN AT MINIMUM AND THE DISCHARGE AIR TEMPERATURE SETPOINT SHALL BE RESET FROM MINIMUM (55.0 DEG. F ADJ.) TO MAXIMUM (65.0 DEG. F ADJ.) AS SPACE TEMPERATURE DROPS FROM 75.0 DEG. F TO 74.0 DEG. F TO MAINTAIN THE SPACE COOLING TEMPERATURE SETPOINT.

ON A CONTINUED DROP OF SPACE TEMPERATURE BELOW THE SPACE COOLING TEMPERATURE SETPOINT (74.0 DEG. F ADJ.) THROUGH (71.0 DEG. F ADJ.) THE SPACE TEMPERATURE CONTROL SHALL BE WITHIN ITS DEADBAND;

THE FAN SPEED REMAINS AT MINIMUM AND DISCHARGE AIR SETPOINT OF (65.0 DEG. F ADJ.) FOR COOLING.

AS SPACE TEMPERATURE DECREASES TOWARDS THE HEATING SETPOINT (71.0 DEG. F ADJ.) THE CONTROL SHALL SWITCH TO THE HEATING DISCHARGE AIR TEMPERATURE RESET. IN THE HEATING MODE, THE HEAT SHALL BE ENABLED; THE SUPPLY FAN SHALL REMAIN AT MINIMUM AIR FLOW AND THE DISCHARGE AIR TEMPERATURE SETPOINT SHALL BE RESET FROM 70.0 DEG. F TO 90.0 DEG. F AS THE SPACE TEMPERATURE DROPS FROM 71.0

DEG. F TO 70.0 DEG. F.

AS SPACE TEMPERATURE CONTINUES TO DECREASE TOWARDS THE HEATING SETPOINT (71.0 DEG. F ADJ.) - 1.0 DEG. F; THE DISCHARGE AIR TEMPERATURE SETPOINT SHALL REMAIN AT MAXIMUM (90.0 DEG. F ADJ.), THE FAN SHALL BE MODULATED FROM MINIMUM TO MAXIMUM AIR FLOW TO MAINTAIN THE SPACE TEMPERATURE HEATING

SETPOINT.

WHEN THE SPACE TEMPERATURE INCREASES THE REVERSE CONTROL SHALL BE IMPLEMENTED.

SUPPLY FAN:

THE UNIT CONTROLLER SHALL VARY THE SUPPLY FAN SPEED TO OPTIMIZE MINIMUM FAN SPEED IN ALL COOLING

AND HEATING MODES.

BUILDING PRESSURE CONTROL (RELIEF AIR):

AFTER THE FAN STARTUP DELAY EXPIRES, BUILDING STATIC PRESSURE SHALL BE CONTROLLED BY MODULATING THE OUTSIDE AIR DAMPER. AS BUILDING PRESSURE INCREASES OVER THE BUILDING PRESSURE SETPOINT (ADJ.), THE DAMPER SHALL MODULATE CLOSED. IF THE BUILDING PRESSURE FALLS BELOW THE SETPOINT, THE DAMPER

SHALL MODULATE OPEN.

MIXED AIR LOW LIMIT:

THE INITIAL DAMPER OPENING RATE SHALL BE LIMITED TO 2% PER MINUTE (ADJ.) UNTIL THE DAMPER HAS REACHED ITS MINIMUM VENTILATION POSITION. THE OUTSIDE AIR DAMPER SHALL MODULATE TO A POSITION LESS THAN THE MINIMUM DAMPER POSITION IF THE MIXED AIR TEMPERATURE DROPS BELOW 50.0 DEG. F (ADJ.). IF THE MIXED AIR TEMPERATURE SENSOR FAILS AN ALARM SHALL ANNUNCIATE AT THE BAS AND THE OUTSIDE AIR

DAMPER SHALL RETURN TO THE MINIMUM POSITION.

FREEZE PROTECTION:

A HARDWIRED, LOW LIMIT TEMPERATURE SWITCH SHALL BE ELECTRICALLY INTERLOCKED WITH THE VARIABLE SPEED DRIVE. IF THE LOW LIMIT TEMPERATURE SWITCH IS TRIPPED 38.0 DEG. F (ADJ.), THE FAN SHALL BE COMMANDED OFF AND THE OUTSIDE AIR DAMPER SHALL CLOSE. ALL VALVES SHALL BE COMMANDED OPEN TO 100% (ADJUST PER CLIMATE). THE DX COOLING SHALL BE DISABLED. AN ALARM SHALL ANNUNCIATE AT THE BAS AND MANUAL RESET OF THE LOW LIMIT TEMPERATURE SWITCH SHALL BE REQUIRED TO RESTART THE FAN.

CONDENSATE OVERFLOW MONITORING:

IF THE CONDENSATE LEVEL REACHES THE TRIP POINT, A CONDENSATE OVERFLOW DIAGNOSTIC SHALL ANNUNCIATE AT THE BAS. TO PREVENT THE CONDENSATE DRAIN PAN FROM OVERFLOWING AND CAUSING WATER DAMAGE TO THE BUILDING THE FAN SHALL BE DISABLED AND THE DX COOLING SHALL BE DISABLED.

FILTER STATUS:

A DIFFERENTIAL PRESSURE SWITCH SHALL MONITOR THE DIFFERENTIAL PRESSURE ACROSS THE FILTER(S) WHEN THE FAN IS RUNNING. IF THE SWITCH CLOSES DURING NORMAL OPERATION A DIRTY FILTER ALARM SHALL

ANNUNCIATE AT THE BAS.

SMOKE DETECTOR SHUTDOWN:

THE UNIT SHALL SHUT DOWN IN RESPONSE TO A SIGNAL FROM THE SMOKE DETECTOR INDICATING THE PRESENCE OF SMOKE. THE SMOKE DETECTOR SHALL BE INTERLOCKED TO THE UNIT THROUGH THE DRY CONTACTS OF THE SMOKE DETECTOR. A MANUAL RESET OF THE SMOKE DETECTOR SHALL BE REQUIRED TO

RESTART THE UNIT.

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1 VAV FLOW DIAGRAM

SEQUENCE OF OPERATION: VAV TERMINAL UNIT

BUILDING AUTOMATION SYSTEM INTERFACE:

THE BUILDING AUTOMATION SYSTEM (BAS) SHALL SEND THE CONTROLLER OCCUPIED, AND UNOCCUPIED COMMANDS. THE BAS MAY ALSO SEND A HEAT/COOL MODE, PRIORITY SHUTDOWN COMMANDS, SPACE TEMPERATURE AND/OR SPACE TEMPERATURE SETPOINT. IF COMMUNICATION IS LOST WITH THE BAS, THE

CONTROLLER SHALL OPERATE USING ITS LOCAL SETPOINTS.

OCCUPIED:

NORMAL OPERATING MODE FOR OCCUPIED SPACES OR DAYTIME OPERATION. WHEN THE UNIT IS IN THE OCCUPIED MODE THE VAV SHALL MAINTAIN THE SPACE TEMPERATURE AT THE ACTIVE OCCUPIED HEATING OR COOLING SETPOINT. APPLICABLE VENTILATION AND AIRFLOW SETPOINTS SHALL BE ENFORCED. THE OCCUPIED

MODE SHALL BE THE DEFAULT MODE OF THE VAV.

UNOCCUPIED:

NORMAL OPERATING MODE FOR UNOCCUPIED SPACES OR NIGHTTIME OPERATION. WHEN THE UNIT IS IN UNOCCUPIED MODE THE VAV CONTROLLER SHALL MAINTAIN THE SPACE TEMPERATURE AT THE STORED UNOCCUPIED HEATING OR COOLING SETPOINT REGARDLESS OF THE PRESENCE OF A HARDWIRED OR COMMUNICATED SETPOINT. WHEN THE SPACE TEMPERATURE EXCEEDS THE ACTIVE UNOCCUPIED SETPOINT THE

VAV SHALL MODULATE FULLY CLOSED.

OCCUPIED BYPASS:

MODE USED TO TEMPORARILY PLACE THE UNIT INTO THE OCCUPIED OPERATION. TENANTS SHALL BE ABLE TO OVERRIDE THE UNOCCUPIED MODE FROM THE SPACE SENSOR. THE OVERRIDE SHALL LAST FOR A MAXIMUM OF 4 HOURS (ADJ.). THE TENANTS SHALL BE ABLE TO CANCEL THE OVERRIDE FROM THE SPACE SENSOR AT ANY TIME.

DURING THE OVERRIDE THE UNIT SHALL OPERATE IN OCCUPIED MODE.

HEAT/COOL MODE:

THE HEAT/COOL MODE SHALL BE SET BY A COMMUNICATED VALUE OR AUTOMATICALLY BY THE VAV. IN STANDALONE OR AUTO MODE THE VAV SHALL COMPARE THE PRIMARY AIR TEMPERATURE WITH THE CONFIGURED AUTO CHANGEOVER SETPOINT TO DETERMINE IF THE AIR IS "HOT"" OR ""COLD"". HEATING MODE IMPLIES THE PRIMARY AIR TEMPERATURE IS HOT. COOLING MODE IMPLIES THE PRIMARY AIR TEMPERATURE IS COLD."

HEAT/COOL SETPOINT:

THE SPACE TEMPERATURE SETPOINT SHALL BE DETERMINED EITHER BY A LOCAL (E.G., THUMBWHEEL) SETPOINT, THE VAV DEFAULT SETPOINT OR A COMMUNICATED VALUE. THE VAV SHALL USE THE LOCALLY STORED DEFAULT SETPOINTS WHEN NEITHER A LOCAL SETPOINT NOR COMMUNICATED SETPOINT IS PRESENT. IF BOTH A LOCAL SETPOINT AND COMMUNICATED SETPOINT EXIST, THE VAV SHALL USE THE COMMUNICATED VALUE.

COOLING MODE:

WHEN THE UNIT IS IN COOLING MODE, THE VAV CONTROLLER SHALL MAINTAIN THE SPACE TEMPERATURE AT THE ACTIVE COOLING SETPOINT BY MODULATING THE AIRFLOW BETWEEN THE ACTIVE COOLING MINIMUM AIRFLOW SETPOINT TO THE MAXIMUM COOLING AIRFLOW SETPOINT. THE VAV SHALL USE THE MEASURED SPACE TEMPERATURE AND THE ACTIVE COOLING SETPOINT TO DETERMINE THE REQUESTED COOLING CAPACITY OF THE UNIT. THE OUTPUTS WILL BE CONTROLLED BASED ON THE UNIT CONFIGURATION AND THE REQUESTED COOLING CAPACITY. WHEN IN THE OCCUPIED MODE, THE CONTROLLER SHALL USE THE MEASURED SPACE TEMPERATURE AND THE ACTIVE COOLING SETPOINT TO DETERMINE THE REQUESTED COOLING CAPACITY OF THE UNIT. THE OUTPUTS SHALL BE CONTROLLED BASED ON THE UNIT CONFIGURATION AND THE REQUESTED COOLING

CAPACITY.

HEATING MODE:

WHEN THE UNIT IS IN HEATING MODE, THE VAV CONTROLLER SHALL MAINTAIN THE SPACE TEMPERATURE AT THE ACTIVE HEATING SETPOINT BY MODULATING THE AIRFLOW BETWEEN THE ACTIVE HEATING MINIMUM AIRFLOW SETPOINT TO THE MAXIMUM HEATING AIRFLOW SETPOINT. THE VAV CONTROLLER SHALL USE THE MEASURED SPACE TEMPERATURE AND THE ACTIVE HEATING SETPOINT TO DETERMINE THE REQUESTED HEATING CAPACITY OF THE UNIT. THE OUTPUTS WILL BE CONTROLLED BASED ON THE UNIT CONFIGURATION AND THE REQUESTED

HEATING CAPACITY.

PROPORTIONAL HOT WATER REHEAT:

IF THE SPACE TEMPERATURE IS BELOW THE HEATING SETPOINT THE HOT WATER REHEAT VALVE SHALL CONTROL

AS REQUIRED TO MAINTAIN THE ACTIVE HEATING SETPOINT.

DEMAND CONTROL VENTILATION:

WHEN THE UNIT IS IN UNOCCUPIED MODE, THE VENTILATION AIRFLOW SETPOINT WILL BE ZERO. WHEN THE UNIT IS IN OCCUPIED MODE, THE VENTILATION AIRFLOW SETPOINT SHALL EQUAL THE DESIGN OUTDOOR AIRFLOW (SEE

VAV SCHEDULE).

THE CURRENT VENTILATION AIRFLOW SETPOINT SHALL BE COMMUNICATED TO THE BAS FOR CONTROL OF THE

SYSTEM OUTDOOR-AIR INTAKE.

SPACE SENSOR FAILURE:

IF THERE IS A FAULT WITH THE OPERATION OF THE ZONE SENSOR AN ALARM SHALL BE ANNUNCIATED AT THE BAS.

SPACE SENSOR FAILURE SHALL CAUSE THE VAV TO DRIVE THE DAMPER TO MINIMUM AIR FLOW IF THE VAV IS IN

THE OCCUPIED MODE, OR DRIVE IT CLOSED IF THE VAV IS IN THE UNOCCUPIED MODE.

HW VLV (AO)

SPT (AI)

SPT SP (AI)

DA FLW (AI)

AIR VLV (AO)

DAT (AI)

DAD

T

AFS

ACT

T

SA

POINTS LIST: VAV TERMINAL UNIT

SYSTEM POINT DESCRIPTION POINTS ALARMS

NOTE: THE CONTROL POINTS FOR THE

ASSOCIATE EQUIPMENT INCLUDES, BUT IS NOT

LIMITED TO, THE FOLLOWING POINTS. THE

CONTROLS CONTRACTOR IS RESPONSIBLE

FOR PROVIDING ALL NECESSARY POINTS TO

CONTROL THE EQUIPMENT PER THE

SEQUENCE OF OPERATION.

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AIR VALVE MODULATION COMMAND

AIR VLV

X X

DISCHARGE AIR TEMPERATURE

DAT

X X X X X

LOCAL HEAT VALVE COMMAND

HW VLV

X X

SPACE TEMPERATURE LOCAL

SPT

X X

SPACE TEMPERATURE SETPOINT LOCAL

SPT SP

X X

SUPPLY AIRFLOW

DA FLW

X X X X

BAS COMMUNICATION STATE

BAS COM

X X

DESIGN HEAT DISCHARGE AIR TEMP SETPOINT

DSNG HT DAT SP

X

MAXIMUM COOLING AIRFLOW SETPOINT

MAX CLG FLW SP

X

MINIMUM COOLING AIRFLOW SETPOINT

MIN CLG FLW SP

X

MAXIMUM HEATING AIRFLOW SETPOINT

MAX HTG FLW SP

X

MINIMUM HEATING AIRFLOW SETPOINT

MIN HTG FLW SP

X

OCCUPIED BYPASS TIMER

OCC TMR

X X

OCCUPIED COOLING SETPOINT

OCC CLG SP

X X

OCCUPIED HEATING SETPOINT

OCC HTG SP

X X

UNOCCUPIED COOLING SETPOINT

UNOCC CLG SP

X X

SPACE OCCUPANCY

OCC SP

X X

UNOCCUPIED HEATING SETPOINT

UNOCC HTG SP

X X

SUPPLY FAN COMMAND

SF CMD

X X

M A

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M A

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