Attachment 07 M-504.pdf

SYSTEM:

CUSTOM VAV AIR HANDLER

7A-AHU-1

POINT

LEGEND

SYSTEM

OUTPUTS

BINARY

ANA-

LOG

BINARY ANALOG

SYSTEM INPUTS SYSTEM SOFTWARE/CONTROL

APPLICATION/FUNCTION

ALARM

PROCESSING

PAGE:

SYSTEM COMPONENT:

RETURN AIR TEMPERATURE

RETURN AIR HUMIDITY

MIXED AIR TEMPERATURE

PRE-HEAT TEMPERATURE

COOLING COIL TEMPERATURE

DISCHARGE AIR TEMPERATURE

DISCHARGE STATIC PRESSURE

DISCHARGE AIR HUMIDITY

OUTSIDE AIR TEMPERATURE

RELIEF FAN RF-1 STATUS

SUPPLY FAN STATUS

MIXED AIR LOW LIMIT

STATIC PRESSURE HIGH LIMIT

HUMIDITY HIGH LIMIT

SUPPLY FAN VSMC ALARM

RELIEF FAN RF-1 VSMC ALARM

DUCT SMOKE DETECTOR

RELIEF FAN RF-2 VSMC

SUPPLY FAN VSMC

RETURN AIR DAMPER

RELIEF AIR DAMPER

PREHEAT VALVE

COOLING VALVE

RELIEF FAN RF-1 START/STOP

SUPPLY FAN START/STOP

AIRFLOW MONITORING - RA

AIRFLOW MONITORING - OA

AIRFLOW MONITORING - SA

AI-1

AI-2

AI-3

AI-4

AI-5

AI-6

AI-7

AI-8

AI-9

BI-2

BI-4

BI-6

BI-7

BI-8

BI-9

BI-10

BI-12

AO-2

AO-3

AO-4

AO-5

AO-7

AO-8

BO-1

BO-3

FT-1

FT-2

FT-3

T-4

H-1

T-5

T-3

T-6

T-1

SP-1

H-2

T-2

CS-IT 1

CS-IT 3

TSL-1

SP-1

HL-1

ALA-SF

ALA-RF 1

SD

SPD-RF 2

SPD-SF

D-2

D-3

V-2

V-1

SST-RF 1

SST-SF

AF-1 / PSL

AF-2

AF-3

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REMARKS

FULL COMMUNICATION

FULL COMMUNICATION

PRE-FILTER 1 BI-1 DPS-1

EF-1 STATUS

EXHAUST DAMPER POSITION

BI-5

BI-13

CS-IT 4

D-5

EF-1 START/STOP

EXHAUST DAMPER OPEN/CLOSE

BO-4

BO-5

SST EF 1

D-5

BI-17 SD-2

STEAM HUMIDIFIER

OUTSIDE AIR DAMPER

PRE-FILTER 2

AFTER FILTER

AO-9

AO-10

BI-14

BI-15

HU-1

D-1

DPS-2

DPS-3

BI-16 SD-1SMOKE DETECTOR 1

SMOKE DETECTOR 2

OUTSIDE AIR HUMIDITY AI-10 H-3

RELIEF FAN RF-2 START/STOP BO-2 SST-RF 2

RELIEF FAN RF-1 VSMC AO-1 SPD-RF 1 FULL COMMUNICATION

RELIEF FAN RF-2 VSMC ALARM BI-11 ALA-RF 2

RELIEF FAN RF-2 STATUS BI-3 CS-IT 2

RELIEF AIR DAMPER AO-6 D-4

RETURN AIR

PRESSURE SWITCH HIGH TO DISABLE

FAN WHEN HIGH PRESSURE LIMIT

SETPOINT IS REACHED (TYPICAL)

STEAM

HUMIDIFIER

STEAM PIPED FROM

ELECTRIC STEAM

HUMIDIFIER

SMOKE

DETECTOR

CHWR

CHWSV-2

LOCATE SENSORS

OUTSIDE UNDER SHIELD

OUTSIDE AIR

V-1

SUPPLY FAN

(2 FAN ARRAY)

SPS

SP-1

HHL

HL-1

HT

H-2

ZC

PSH

SD2

DPS

TT

T-1

SST

SF

HS

CS

IT-2

VFD

SPD

SF

TT

T-6

TT

T-3

TT

T-5

TSL

TSL-1

C O

IL

C O

O L

IN

G

C O

IL

P R

E H

E A

T

A F

T E

R -F

IL

T

E R

P R

E -F

IL

T

E R

-1

FT

AF-1

PSL

A F

M D

HT

H-1

TT

T4

TT

T-2

A F

M D

DPS

D-1

ZC

D-2

MT

P R

E -F

IL

T

E R

-2

DPS

ZC

D-3

FT

AF-2

RELIEF AIR

ZC

FT

AF-3

A F

M D

SUPPLY AIR TO

TERMINAL UNIT

CURRENT

TRANSMITTER FOR FAN

STATUS (TYP.)

SST

EF

VFD HS

SPD

EF

ALA

EF

COMM

IT-1

CS

1 2

HHWR

HHWS

ALA

SF

COMM

LOW PRESSURE SWITCH

SP-1 FT

AF-3

A F

M D

M

M

HT

H-3

SD1

SST

EF

VFD HS

SPD

EF

ALA

EF

COMM

IT-1

CS

RELIEF

FAN RF-1

ZC

D-4

RELIEF

FAN RF-2

RELIEF AIR

1. GENERAL FAN/TEMPERATURE CONTROL

1.1 COOLING-OCCUPIED/OVERRIDE: AHU'S WILL BE INTERLOCKED WITH ASSOCIATED AREA EXHAUST FANS, SO EACH EXHAUST FAN WILL OPERATE WHENEVER ITS ASSOCIATED AHU IS ENERGIZED. AHU SUPPLY FAN SPEED SHALL BE DETERMINED BY DISCHARGE AIR PRESSURE AND POLLING OF VAV BOX DAMPER POSITIONS. DISCHARGE AIR PRESSURE SHALL INCLUDE A "CRITICAL ZONE RESET STRATEGY" WHICH REDUCES DISCHARGE AIR PRESSURE UNTIL AT LEAST ONE ZONE VAV BOX DAMPER IS 90% OPEN. THE INITIAL AIR PRESSURE SETPOINT SHALL BE 5" WG (ADJUSTABLE). THE AHU RETURN AIR FAN SHALL BE INTERLOCKED WITH THE SUPPLY AIR FAN. THE RETURN AIR FAN SPEED OFFSET SHALL BE DETERMINED DURING THE INITIAL TAB WORK. AS SPACE PRESSURIZATION RISES ABOVE 0.01" WG, THE RELIEF AIR FAN SHALL START AND RESPECITVE DAMPER SHALL OPEN TO MAINTAIN SPACE PRESSURIZATION AT 0.01" WG (ADJUSTABLE). CHILLED WATER CONTROL VALVE SHALL MODULATE TO MAINTAIN THE DISCHARGE AIR TEMPERATURE OF 55°F (ADJ). OUTDOOR AIR DAMPER AND RETURN AIR DAMPER SHALL MODULATE TO MAINTAIN A MINIMUM OUTDOOR AIR QUANTITY DURING OCCUPIED CYCLE AS SHOWN ON THE AIR HANDLING UNIT

SCHEDULE AS MEASURED BY AN AIRFLOW MEASURING STATION.

1.2 COOLING-UNOCCUPIED: SHALL OPERATE AS IN OCCUPIED MODE.

1.3 HEATING-OCCUPIED: AHU SUPPLY AIR FAN SHALL BE ENERGIZED AND RUN CONTINUOUSLY. OA FLOW WILL BE MAINTAINED AS DESCRIBED IN COOLING-OCCUPIED MODE ABOVE. WHEN DISCHARGE AIR TEMPERATURE DROPS BELOW 52°F, DISCHARGE AIR TEMPERATURE CONTROLLER THRU DDC CONTROL SHALL MODULATE THE HEATING VALVE TO MAINTAIN 55°F LEAVING AIR TEMPERATURE. THE CHILLED WATER VALVE SHALL BE FULLY CLOSED TO THE

COIL WHEN IN HEATING MODE.

1.4 HEATING-UNOCCUPIED: UNIT SHALL BE DE-ENERGIZED UNLESS THE AVERAGE OF THE ZONE TEMPERATURES FALLS BELOW THE SETBACK TEMPERATURE SETPOINT. THE OA AND EA DAMPER SHALL BE CLOSED.

1.5 TRANSITION FROM OCCUPIED TO UNOCCUPIED: AUTOMATICALLY THRU DDC CONTROL AND PRESET TIME SCHEDULE.

SYSTEM SHALL ALSO BE ABLE TO BE RETURNED TO OCCUPIED MODE FROM UNOCCUPIED MODE BY THE OPERATOR WORKSTATION. TRANSITION FROM COOLING TO HEATING SHALL OCCUR WHEN CHILLED WATER CONTROL VALVE IS

CLOSED AND DISCHARGE AIR TEMPERATURE FALLS BELOW 52°F.

2. HUMIDIFICATION MODE:

2.1 THE SUPPLY AIR HIGH LIMIT HUMIDITY SENSOR SETPOINT SHALL BE CAPABLE OF BEING ADJUSTED FROM EITHER THE

CENTRAL OR LOCAL ECC CONTROL PANEL.

2.2 THE RETURN AIR HUMIDITY SENSOR LOCATED IN THE RETURN AIR DUCT SHALL MODULATE THE HUMIDIFIER TO MAINTAIN THE SPACE HUMIDITY. THE HIGH LIMIT HUMIDITY SENSOR SHALL MODULATE THE HUMIDIFIER TO

MAINTAIN 30% ADJUSTABLE RELATIVE HUMIDITY IN THE SPACES.

2.3 THE OUTDOOR AIR TEMPERATURE SENSOR SHALL CLOSE OFF THE HUMIDIFIER STEAM SUPPLY VALVE WHEN THE OUTSIDE AIR TEMPERATURE IS ABOVE & OPEN THE HUMIDIFIER STEAM SUPPLY VALVE WHEN OUTSIDE AIR

TEMPERATURE IS BELOW 60°F.

3. EPIDEMIC MODE:

3.1 EPIDEMIC MODE SHALL BE MANUALLY INITIATED AT THE ECC. AHU SHALL OPERATE WITH 100% OUTDOOR AIR DURING

EPIDEMIC MODE AS FOLLOWS:

3.2 RETURN DAMPER SHALL MODULATE CLOSED WHILE THE OUTSIDE AIR DAMPER MODULATES TO FULL OPEN.

3.3 LEAD RELIEF FAN SHALL START AND MODULATE ITS SPEED TO MAINTAIN BUILDING PRESSURE TO OUTDOORS AT 0.01" W.G. PRESSURE MONITOR SHALL BE LOCATED IN SEATING 120. LAG RELIEF FAN SHALL START IF THE LEAD FAN FAILS

TO START AFTER 5 MINUTES (ADJ.).

3.4 PREHEAT COIL AND COOLING COIL VALVES SHALL MODULATE IN SEQUENCE TO MAINTAIN THE DISCHARGE AIR

TEMPERATURE FOR OCCUPIED MODE (SEE ABOVE).

4. ECONOMIZER:

4.1 A COMPARATIVE ENTHALPY ECONOMIZER STRATEGY SHALL BE UTILIZED. THE OUTSIDE AIR DAMPER SHALL MODULATE OPEN AND THE RETURN AIR DAMPER SHALL MODULATE CLOSED WHEN OA ENTHALPY IS LESS THAN

RETURN AIR ENTHALPY IN COOLING MODE.

5. SAFETY CONTROL/PROTECTION:

5.1 SMOKE DETECTOR SHALL BE PROVIDED BY FIRE ALARM CONTRACTOR. THROUGH DDC CONTROL IT SHALL DE-ENERGIZE THE ASSOCIATED AHU, ALL ASSOCIATED VAV SUPPLY AND EXHAUST FANS (INCLUDING INTERLOCKS), SIGNAL FIRE ALARM PANEL AND CLOSE THE OUTSIDE AIR DAMPER UPON THE DETECTION OF THE PRODUCTS OF

COMBUSTION.

5.2 FREEZE PROTECTION: IF HEATING WATER COIL DISCHARGE AIR TEMPERATURE FALLS BELOW 40°F DURING HEATING MODE, THE FREEZESTAT SHALL CLOSE THE OUTSIDE AIR DAMPER, DE-ENERGIZE THE AHU SUPPLY AIR FAN AND FULLY

OPEN THE PRIMARY STEAM AND CHILLED WATER VALVES TO COIL.

5.3 PRESSURE PROTECTION: A HIGH PRESSURE TRANSMITTER LOCATED AT THE SUPPLY FAN DISCHARGE SHALL

DE-ENERGIZE THE SUPPLY AIR FAN IF ITS SETPOINT, 5” WG, IS REACHED.

5.4 CONDENSATE HIGH LEVEL PROTECTION: IF CONDENSATE HIGH LEVEL SWITCH IS ACTIVATED, UNIT SHALL BE

DE-ACTIVATED AND AN ALARM INITIATED.

6. ALARMS:

6.1 ALARM FOR DIRTY FILTER WHEN PRESSURE DROP EXCEEDS 0.5” WG ABOVE INITIAL PRESSURE DROP. ALARM IF LEAVING AIR TEMPERATURE EXCEEDS 60°F IN COOLING MODE OR DROPS BELOW 50°F IN HEATING MODE. ALARM IF AHU SUPPLY OR EXHAUST AIR FAN FAILS TO START OR FAILS DURING OPERATION. ALARM IF UNIT DISCHARGE STATIC PRESSURE EXCEEDS 5” WG. ALARM IF CONDENSATE REACHES HIGH LEVEL. ALARM UPON SMOKE DETECTOR

ACTIVATION.

7. GRAPHICS AND MONITORING:

7.1 BAS FRONT END SYSTEM SHALL INCLUDE GRAPHICS SHOWING ALL HVAC SYSTEMS, ALARMS AND OTHER POINTS SHOWN ON THE DRAWINGS AND INCLUDED IN THE SPECIFICATIONS AND IN ACCORDANCE WITH VA REQUIREMENTS.

VFDS SHALL REPORT OPERATIONAL AND ALARM CONDITIONS TO THE BAS.

8. DDC PANELS:

8.1 PROVIDE NETWORK AREA CONTROL PANELS IN ACCORDANCE WITH THE SPECS TO BE LOCATED IN THE EXISTING

RESPECTIVE LOCATIONS TO SERVE AHUS, TERMINAL BOXES, AND OTHER EQUIPMENT.

DA

AO - REHEATING VALVE

HW

M

HWS HWR

T

AI - DISCHARGE AIR TEMP

AI - AIRFLOW

M

AO - ZONE DAMPER

SA

T AI - ZONE TEMP

AI - ZONE SETPOINT ADJUST

F

H AI - ZONE HUMIDITY

AI - ZONE HUMIDITYSETPOINT

VISIBLE ALARM

APPLY TO OPERATING

ROOMS ONLY

VAV TERMINAL UNIT

VARIABLE AIR VOLUME - TERMINAL UNIT

RUN CONDITIONS - CONTINUOUS:

THE UNIT SHALL RUN CONTINUOUSLY AND SHALL MAINTAIN:

• A 75°F (ADJ.) COOLING SETPOINT.

• A 70°F (ADJ.) HEATING SETPOINT.

ALARMS SHALL BE PROVIDED AS FOLLOWS:

• HIGH ZONE TEMP: IF THE ZONE TEMPERATURE IS GREATER THAN THE COOLING SETPOINT BY A USER

DEFINABLE AMOUNT (ADJ.).

• LOW ZONE TEMP: IF THE ZONE TEMPERATURE IS LESS THAN THE HEATING SETPOINT BY A USER

DEFINABLE AMOUNT (ADJ.).

ZONE SETPOINT ADJUST:

THE OCCUPANT SHALL BE ABLE TO ADJUST THE ZONE TEMPERATURE HEATING AND COOLING SETPOINTS AT

THE ZONE SENSOR.

PRESSURE INDEPENDENT VARIABLE VOLUME TERMINAL UNIT - FLOW CONTROL:

THE UNIT SHALL MAINTAIN ZONE SETPOINTS BY CONTROLLING THE AIRFLOW THROUGH ONE OF THE

FOLLOWING:

OCCUPIED:

• WHEN ZONE TEMPERATURE IS GREATER THAN ITS COOLING SETPOINT, THE ZONE DAMPER SHALL

MODULATE BETWEEN THE MINIMUM OCCUPIED AIRFLOW (ADJ.) AND THE MAXIMUM COOLING AIRFLOW

(ADJ.) UNTIL THE ZONE IS SATISFIED.

• WHEN THE ZONE TEMPERATURE IS BETWEEN THE COOLING SETPOINT AND THE HEATING SETPOINT, THE

ZONE DAMPER SHALL MAINTAIN THE MINIMUM REQUIRED ZONE AIRFLOW (ADJ.).

• WHEN ZONE TEMPERATURE IS LESS THAN ITS HEATING SETPOINT, THE CONTROLLER SHALL MODULATE

THE HEATING VALVE OPEN TO MAINTAIN THE ZONE TEMPERATURE AT ITS HEATING SETPOINT.

ADDITIONALLY, IF WARM AIR IS AVAILABLE FROM THE AHU, THE ZONE DAMPER SHALL MODULATE BETWEEN THE MINIMUM OCCUPIED AIRFLOW (ADJ.) AND THE MAXIMUM HEATING AIRFLOW (ADJ.) UNTIL

THE ZONE IS SATISFIED.

UNOCCUPIED:

• WHEN THE ZONE IS UNOCCUPIED THE ZONE DAMPER SHALL CONTROL TO ITS MINIMUM UNOCCUPIED

AIRFLOW (ADJ.).

• WHEN THE ZONE TEMPERATURE IS GREATER THAN ITS COOLING SETPOINT, THE ZONE DAMPER SHALL

MODULATE BETWEEN THE MINIMUM UNOCCUPIED AIRFLOW (ADJ.) AND THE MAXIMUM COOLING AIRFLOW

(ADJ.) UNTIL THE ZONE IS SATISFIED.

• WHEN ZONE TEMPERATURE IS LESS THAN ITS UNOCCUPIED HEATING SETPOINT, THE CONTROLLER SHALL MODULATE THE HEATING VALVE OPEN TO MAINTAIN THE ZONE TEMPERATURE AT THE SETPOINT.

ADDITIONALLY, IF WARM AIR IS AVAILABLE FROM THE AHU, THE ZONE DAMPER SHALL MODULATE BETWEEN THE MINIMUM UNOCCUPIED AIRFLOW (ADJ.) AND THE AUXILIARY HEATING AIRFLOW (ADJ.)

UNTIL THE ZONE IS SATISFIED.

REHEATING COIL VALVE:

THE CONTROLLER SHALL MEASURE THE ZONE TEMPERATURE AND MODULATE THE REHEATING COIL VALVE

OPEN ON DROPPING ZONE TEMPERATURE TO MAINTAIN ITS HEATING SETPOINT.

REHEATING - HIGH DISCHARGE AIR TEMPERATURE LIMIT:

THE CONTROLLER SHALL MEASURE THE DISCHARGE AIR TEMPERATURE AND LIMIT HOT WATER VALVE POSITION IF THE DISCHARGE AIR TEMPERATURE IS MORE THAN 15°F (ADJ.) ABOVE THE ZONE TEMPERATURE.

DISCHARGE AIR TEMPERATURE:

THE CONTROLLER SHALL MONITOR THE DISCHARGE AIR TEMPERATURE.

ALARMS SHALL BE PROVIDED AS FOLLOWS:

• HIGH DISCHARGE AIR TEMP: IF THE DISCHARGE AIR TEMPERATURE IS GREATER THAN 100°F (ADJ.).

• LOW DISCHARGE AIR TEMP: IF THE DISCHARGE AIR TEMPERATURE IS LESS THAN 50°F (ADJ.).

ALARMS SHALL BE PROVIDED AS FOLLOWS:

• HIGH HUMIDITY: IF THE SPACE RELATIVE HUMIDITY RISES ABOVE 60% A VISIBLE ALARM SHALL BE

INITIATED IN THE AFFECTED OR AND AT THE DDC MONITORING STATION.

POINT NAME:

ZONE TEMPERATURE

ZONE TEMPERATURE SETPOINT

AIRFLOW

DISCHARGE AIR TEMPERATURE

ZONE DAMPER

REHEATING VALVE

MAXIMUM OCCUPIED AIRFLOW SETPOINT

HEATING MODE

HEATING SETPOINT

COOLING SETPOINT

HIGH ZONE TEMPERATURE

LOW ZONE TEMPERATURE

HIGH DISCHARGE TEMPERATURE

LOW DISCHARGE TEMPERATURE

HARDWARE POINTS

AI AO

X

X

X

X

BI BO

SOFTWARE POINTS

AV BV LOOP SCHED TREND ALARM SHOW ON GRAPHIC

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

TOTAL HARDWARE (8) TOTAL SOFTWARE (21)

6 2 3

X

X

X

X

12 5 13

X

X

X

X

X

X

HIGH ZONE HUMIDITY

MINIMUM OCCUPIED AIR FLOW SETPOINT

MINIMUM UNOCCUPIED AIRFLOW SETPOINT

ZONE HUMIDITY

ZONE HUMIDITY SETPOINT

X

X

X

X

X

X

X

X

X

X

X

X X

Engineers Architects

Revisions: Date

Drawing Title

Approved

Project Title

Location

VA PROJECT NUMBER

Building Number

Drawing Number

Dwg of

VA FORM 08-6231

Office of Construction and Facilities Management

CONSULTANTS: PROJECT MANAGER

Date Checked Drawn

FULLY SPRINKLERED

ACG Project Number

Headquarters:

Apogee Consulting Group, P.A.

1151 Kildaire Farm Road Cary, North Carolina 27511 www.acg-pa.com 919-858-7420 U.S. Department of Veterans Affairs# © COPYRIGHT Apogee Consulting Group, P.A.

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M-504

MECHANICAL CONTROLS

13 15PRP

CLC RESIDENTIAL

NEIGHBORHOOD

G.V. MONTGOMERY VAMC

1500 E. WOODROW WILSON AVENUE

JACKSON, MS 39216 JUNE 23, 2025

100% CONSTRUCTION DOCUMENTS

586-40123-060

7A

WRS

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7A-AHU-1 POINTS LIST

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7A-AHU-1 SCHEMATIC

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7A-AHU-1 SEQUENCE OF OPERATIONS

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VAV TERMINAL SCHEMATIC

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VAV TERMINAL SEQUENCE OF OPERATION

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VAV TERMINAL UNIT CONTROLS

1 ADDENDUM 1 6/29/2026

Docusign Envelope ID: EC0B67D1-8783-88BA-8137-1E253E84F1B1

6/29/2026