PN 636-25-301 Drawings Part 3 - 22 pages.pdf

12 13 14 1517.A 17.B 17.C 17.D

17.2

17.1

N

M

L

17.3

K

MOTORIZED

DAMPER

60x54 SA

108x54 SA

60x24 SA UP

(TYP. 4)

60x40 SA

CAPPED FOR

FUTURE

x5

S

A

17-M401

17-M401

108x40 SA

CAPPED FOR

FUTURE

CONTROL

PANELS

17-M401

FF-3

20X10

SDSD

SA-3

SF-3

H-AHU3-1 H-AHU3-2

PF3-2

20X10

PF3-1

20X10

17-M403

CC-3CC3-1W

HC3-1W HC-3

VFD3-1

Project Number

Building Number

Drawing Number

Project Title

Location

Issue Date Checked Drawn

Drawing Title

Approved:

VA FORM 08 - 6231

A

CONSTRUCTION

DOCUMENTS

FULLY SPRINKLERED

Office of Construction and Facilities Management

U.S. Department of Veterans Affairs

B

C

D

E

F

21 4 5 6 7 8 9 10

Phase

STAMP

321 4 5 6 7 8 9 10

ARCHITECT/ENGINEER OF RECORD

InfraStructure, LLC 6910 Pacific Street, Suite 310 Omaha, NE 68106 Phone: (402) 554-0234

Specialized Engineering Solutions 10360 Ellison Circle Omaha, NE 68134 Phone: (402) 991-5520

NE COA NUMBER: CA-1620

Alesia Architecture P.C.

3705 North 200th Street Elkhorn, Nebraska 68022 Phone: (402) 291-6941

NE COA NUMBER: CA-0721

on e ei gh th in ch o ne f oo t th re e in ch es o ne f oo t

6" on e an d on e ha lf in ch es o ne f oo t on e in ch o ne f oo t

6" 6" th re e qu ar te rs in ch o ne f oo t on e ha lf in ch o ne f oo t th re e ei gh th s in ch o ne f oo t on e qu ar te r in ch o ne f oo t

A

B

C

D

E

F

12/24/2025A u to d e s k D o c s /1

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M

17-MH102

BUILDING 17 - MEZZANINE LEVEL -

DUCTWORK

Correct HVAC Deficiencies

4101 Woolworth Ave, Omaha, NE 68105

636-25-301

12/24/2025 JMM NAP

KEY NOTES:

1. 70X108 SA PLENUM TO PROVIDE INITIAL TEMPORARY AIR TO EXISTING AHU-1 RISERS. REMOVAL OF EXISTING

AND TIE-IN OF TEMPORARY AND INITIATION OF TEMPORARY AIRFLOW MUST OCCUR WITHIN A FOUR HOUR

WINDOW.

2. FAN ARRAY CANNOT EXCEED 135 PSF OVER THE FOOTPRINT OF THE ARRAY.

3. NEW VARIABLE SPEED DRIVES. TWO DRIVES (ONE REDUNDANT).

4. EXTENDED OUTSIDE AIR INTAKE ABOVE UNIT. PROVIDE 8’X3’ OPENING INTO TOP OF UNIT WITH MOTORIZED

DAMPER.

5. 60”X40” DUCT TO BACKFEED AHU-1 DOWNSTREAM DUCTWORK UNDER AHU-1 ADDITIVE BID ITEM IWORK.

CAP DUCT FOR FUTURE CONNECTION UNDER BASE CASE.

6. EXISTING LOUVERS TO BE REMOVED TO FACILITATE REMOVAL OF EXISTING COMPONENTS AND ENTRY OF

NEW COMPONENTS. OPENING TO BE PHYSICALLY SECURED AT ALL TIMES. PERIOD PROTECT EXISTING LOUVERS FROM DAMAGE. REPLACE LOUVERS AS SOON AS FEASIBLE AFTER NEW EQUIPMENT IS SECURED

IN THE BUILDING.

7. CONSTRUCT PLENUM SPACE BELOW PREHEAT COIL WITH FIN TUBE HEATING AND DRAIN TO ALLOW FOR

MELTING OF BUILT UP SNOW IN OUTSIDE AIR INTAKE PLENUM.

8. INCREASE EXISTING OPENIN SIZE TO 84"X84". CONNECT NEW DUCTWORK TO NEW OPENING AND BLANK OFF NEW DUCTWORK INSIDE AHU-3 DISCHARGE UNDER TEMPORARY AIR WORK AND REMOVE AFTER AHU-3 UPGRADES ARE MADE AND UNIT IS TO BE PUT INTO OPERATION. BLANK OFF CONSTRUCTION TO ALLOW QUICK REPLACEMENT SHOULD ISSUES ARISE WHEN BRINGING AHU-3 ON LINE FOR SERVICE. AHU-3 TO OPERATE UNDER STABLE OPERATION FOR A MINIMUM OF 7 DAYS BEFORE TEMPORARY AIR SERVICE TO

AHU-3 IS DECOMMISSIONED.

9. PROVIDE 18 INCH BY 18 INCH DOUBLE PANE UV RESISTANT WINDOW IN 24 INCH BY 84 INCH ACCESS DOOR.

PROVIDE CUT OUT SWITCH ON DOOR INTERLOCKED WITH UV LIGHT CONTROLS TO TURN OFF UV LIGHTS

WHEN ACCESS DOOR IS OPENED.

10. PROVIDE 16 GAUGE BLANK OFF PLATES AT UNIT ELEMENTS AS INDICATED TO ISOLATE UPSTREAM AND DOWNSTREAM SECTIONS. SEAL ALL MATING SECTIONS TO SMACNA SEAL CLASS A. WHERE INDICATED

PROVIDE 24 INCH BY 84 INCH ACCESS DOORS IN BLANK OFFS.

11. PROVIDE 4 INCH 16 GAUGE DOUBLE WALL INSULATED BLANK OFF AT COOLING COILS TO ISOLATE UPSTREAM

AND DOWNSTREAM SECTIONS. SEAL ALL MATING SECTIONS TO SMACNA SEAL CLASS A.

12. PROVIDE NEW DIFFERENTIAL PRESSURE SENSOR IN 54 INCH DUCT RISER AT LEVEL 3. REFER TO NEW AHU-3

SEQUENCE FOR INFORMATION ON TESTING DUCT PRESSURE TO ESTABLISH INITIAL SETPOINT.

1/4" = 1'-0"1

BUILDING 17 - MEZZANINE LEVEL - DUCTWORK

N

1. NEW HOUSEKEEPING PAD LOCATIONS ARE BASED ON BASIS OF DESIGN EQUIPMENT SELECTIONS.

COORDINATE FINAL LOCATION OF NEW HOUSEKEEPING PADS WITH CONTRACTORS PURCHASED

EQUIPMENT, EQUIPMENT SUPPORTS AND FINAL LAYOUT PER COORDINATION DRAWINGS.

2. COOLING COIL INSTALLATION: FIELD VERIFY EXISTING CONDITIONS. CASING HEIGHT TO BE COORDINATED WITH EXISTING CONDITIONS, COIL BASE SUPPORT DETAIL 9/17-M505 AND SUPPLEMENTAL COIL SUPPORTS.

3. PROVIDE SUPPORTS OF ALL UNIT COMPONENTS AS NEEDED FOR STRUCTURAL STABILITY. COORDINATE

COIL AND FILTER SUPPORT REQUIREMENTS WITH THE COIL AND FILTER MANUFACTURERS.

SHEET NOTES:

Mark Revisions: Date:

17.1

N

M

L

17.3

K

17-M402

17-M402

144x40 SA

60x40 SA

52ø SA

70x108 SA

PLENUM

144x40 SA

38ø SA

EXTENDED

INTAKE PLENUM

H-AHU1-1 H-AHU1-2

SF-1

SA-1

FF-1

20X10

17-M404

HC1-1W HC-1

SDSD

CDCD

10PF1-2

20X10

PF1-1

20X10

CC1-2ECC1-4W

VFD1-1

VFD1-2

Project Number

Building Number

Drawing Number

Project Title

Location

Issue Date Checked Drawn

Drawing Title

Approved:

VA FORM 08 - 6231

A

CONSTRUCTION

DOCUMENTS

FULLY SPRINKLERED

Office of Construction and Facilities Management

U.S. Department of Veterans Affairs

B

C

D

E

F

21 4 5 6 7 8 9 10

Phase

STAMP

321 4 5 6 7 8 9 10

ARCHITECT/ENGINEER OF RECORD

InfraStructure, LLC 6910 Pacific Street, Suite 310 Omaha, NE 68106 Phone: (402) 554-0234

Specialized Engineering Solutions 10360 Ellison Circle Omaha, NE 68134 Phone: (402) 991-5520

NE COA NUMBER: CA-1620

Alesia Architecture P.C.

3705 North 200th Street Elkhorn, Nebraska 68022 Phone: (402) 291-6941

NE COA NUMBER: CA-0721

on e ei gh th in ch o ne f oo t th re e in ch es o ne f oo t

6" on e an d on e ha lf in ch es o ne f oo t on e in ch o ne f oo t

6" 6" th re e qu ar te rs in ch o ne f oo t on e ha lf in ch o ne f oo t th re e ei gh th s in ch o ne f oo t on e qu ar te r in ch o ne f oo t

A

B

C

D

E

F

12/24/2025A u to d e s k D o c s /1

-2

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C o rr e c t H

V A

C D e fi c ie n c ie s /6

-3

.B

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P .R

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/2 /2

:4

:1

A

M

17-MH102-A

BUILDING 17 - MEZZANINE LEVEL -

DUCTWORK - ADDITIVE BID ITEM I

Correct HVAC Deficiencies

4101 Woolworth Ave, Omaha, NE 68105

636-25-301

12/24/2025 JMM NAP

KEY NOTES:

1. 70X108 SA PLENUM TO PROVIDE INITIAL TEMPORARY AIR TO EXISTING AHU-1 RISERS. REMOVAL OF EXISTING

AND TIE-IN OF TEMPORARY AND INITIATION OF TEMPORARY AIRFLOW MUST OCCUR WITHIN A FOUR HOUR

WINDOW.

2. FAN ARRAY CANNOT EXCEED 135 PSF OVER THE FOOTPRINT OF THE ARRAY.

3. NEW VARIABLE SPEED DRIVES FOR AHU-1. FOUR DRIVES (ONE REDUNDANT).

4. PROVIDE EXTENDED INTAKE PLENUM ABOVE EXISTING AHU-1. PROVIDE NEW 8’X3’ OPENING INTO TOP OF

UNIT WITH MOTORIZED DAMPER. REMOVE LOUVER BLANKOFF PLATE AND CONNECT NEW PLENUM TO LOUVER CONSTRUCTED OF 4 INCH DOUBLE WALL INSULATED PANELS. SEAL ALL SEAMS TO SMACNA SEAL

CLASS A. REFER TO ELEVATION FOR ADDITIONAL INFORMATION.

5. 60”X40” DUCT TO BACKFEED AHU-1 DOWNSTREAM DUCTWORK UNDER AHU-1 UPGRADE WORK AND AHU-1

ALTERNATE WORK. CAP DUCT FOR FUTURE CONNECTION UNDER BASE CASE.

6. EXISTING LOUVERS TO BE REMOVED TO FACILITATE REMOVAL OF EXISTING COMPONENTS AND ENTRY OF NEW COMPONENTS. OPENING TO BE PHYSICALLY SECURED AT ALL TIMES PERIOD PROTECT EXISTING LOUVERS FROM DAMAGE. REPLACE LOUVERS AS SOON AS FEASIBLE AFTER NEW EQUIPMENT IS SECURED

IN THE BUILDING.

7. PROVIDE 18 INCH BY 18 INCH DOUBLE PANE UV RESISTANT WINDOW IN 24 INCH BY 84 INCH ACCESS DOOR.

PROVIDE CUT OUT SWITCH ON DOOR INTERLOCKED WITH UV LIGHT CONTROLS TO TURN OFF UV LIGHTS

WHEN ACCESS DOOR IS OPENED.

8. PROVIDE 16 GAUGE BLANK OFF PLATES AT UNIT ELEMENTS AS INDICATED TO ISOLATE UPSTREAM AND DOWNSTREAM SECTIONS. SEAL ALL MATING SECTIONS TO SMACNA SEAL CLASS A. WHERE INDICATED

PROVIDE 24 INCH BY 84 INCH ACCESS DOORS IN BLANK OFFS.

9. PROVIDE 4 INCH 16 GAUGE DOUBLE WALL INSULATED BLANK OFF AT COOLING COILS TO ISOLATE UPSTREAM

AND DOWNSTREAM SECTIONS. SEAL ALL MATING SECTIONS TO SMACNA SEAL CLASS A.

10. PROVIDE NEW DIFFERENTIAL PRESSURE SENSOR IN 36 INCH DUCT RISER AT LEVEL 3. REFER TO NEW AHU-1

SEQUENCE FOR INFORMATION ON TESTING DUCT PRESSURE TO ESTABLISH INITIAL SETPOINT.

1/4" = 1'-0"1

BUILDING 17 - MEZZANINE LEVEL - DUCTWORK - ADDITIVE BID ITEM I

N

1. NEW HOUSEKEEPING PAD LOCATIONS ARE BASED ON BASIS OF DESIGN EQUIPMENT SELECTIONS.

COORDINATE FINAL LOCATION OF NEW HOUSEKEEPING PADS WITH CONTRACTORS PURCHASED

EQUIPMENT, EQUIPMENT SUPPORTS AND FINAL LAYOUT PER COORDINATION DRAWINGS.

2. COOLING COIL INSTALLATION: FIELD VERIFY EXISTING CONDITIONS. CASING HEIGHT TO BE COORDINATED WITH EXISTING CONDITIONS, COIL BASE SUPPORT DETAIL 9/17-M505 AND SUPPLEMENTAL COIL SUPPORTS.

3. PROVIDE SUPPORTS OF ALL UNIT COMPONENTS AS NEEDED FOR STRUCTURAL STABILITY. COORDINATE

COIL AND FILTER SUPPORT REQUIREMENTS WITH THE COIL AND FILTER MANUFACTURERS.

SHEET NOTES:

12 13 14 15 16 1717.A 17.B 17.C 17.D

17.1

N

M

L

17.3

K

120x48 SA

72x108 SA

SDSD

SDSD

96x96 SA 96x96 SATFF-1

TFF-2

TH-1 TH-2

TF-2TF-1

TCC-1

TCC-2

96x96 OA96x96 OA

THC-1 THC-2

TPF-1

192x96 OA

4 4

EXISTING HOUSEKEEPING PAD

EXISTING HOUSEKEEPING PAD

17-M505

17-M505

17-M505

90x40 SA

Project Number

Building Number

Drawing Number

Project Title

Location

Issue Date Checked Drawn

Drawing Title

Approved:

VA FORM 08 - 6231

A

CONSTRUCTION

DOCUMENTS

FULLY SPRINKLERED

Office of Construction and Facilities Management

U.S. Department of Veterans Affairs

B

C

D

E

F

21 4 5 6 7 8 9 10

Phase

STAMP

321 4 5 6 7 8 9 10

ARCHITECT/ENGINEER OF RECORD

InfraStructure, LLC 6910 Pacific Street, Suite 310 Omaha, NE 68106 Phone: (402) 554-0234

1, 17

Specialized Engineering Solutions 10360 Ellison Circle Omaha, NE 68134 Phone: (402) 991-5520

NE COA NUMBER: CA-1620

Alesia Architecture P.C.

3705 North 200th Street Elkhorn, Nebraska 68022 Phone: (402) 291-6941

NE COA NUMBER: CA-0721

on e ei gh th in ch o ne f oo t th re e in ch es o ne f oo t

6" on e an d on e ha lf in ch es o ne f oo t on e in ch o ne f oo t

6" 6" th re e qu ar te rs in ch o ne f oo t on e ha lf in ch o ne f oo t th re e ei gh th s in ch o ne f oo t on e qu ar te r in ch o ne f oo t

A

B

C

D

E

F

12/24/2025A u to d e s k D o c s /1

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A

M

1-MH103

BUILDINGS 01 AND 17 - THIRD LEVEL

AND ROOF - DUCTWORK

Correct HVAC Deficiencies

4101 Woolworth Ave, Omaha, NE 68105

636-25-301

12/24/2025 JMM NAP

N

1. THIS PLAN SHOWS VARIOUS COMPONENTS FOR A FIELD ASSEMBLED TEMPORARY AIR SYSTEM TO PROVIDE CONDITIONED AIR FOR BACK FEED OF AIR HANDLING UNITS AHU-1 AND AHU-3 DURING THEIR UPGRADES. THE BASIS OF DESIGN PERFORMANCE OF THE COMPONENTS IS INDICATED ON THE PROJECT SCHEDULE SHEETS. ALTERNATE EQUIPMENT, SUCH AS RENTAL EQUIPMENT OR SINGLE LARGER CAPACITY COILS OR ALTERNATE ARRANGEMENTS SUCH AS A FAN ARRAY, THAT MEET THE MINIMUM DESIGN REQUIREMENTS MAY BE SUBMITTED FOR CONSIDERATION AND APPROVAL BY THE VA COR AND THE ENGINEER OF RECORD; INLINE ARRANGEMENT OF COMPONENTS MAY NOT BE ALTERED (FOR EXAMPLE, IT IS NOT ACCEPTABLE TO LOCATE THE PREHEAT COIL DOWNSTREAM O THE FAN OR THE FINAL FILTERS UPSTREAM OF THE FAN.). IT WOULD ALSO BE ACCEPTABLE TO CREATE ONE LARGE CAPACITY UNIT OR THREE SMALLER CAPACITY UNITS AS LONG AS THE DELIVERED PERFORMANCE MEETS OR EXCEEDS THE

SCHEDULED PERFORMANCE.

2. COOLING COIL INSTALLATION: FIELD VERIFY EXISTING CONDITIONS. CASING HEIGHT TO BE COORDINATED WITH EXISTING CONDITIONS, COIL BASE SUPPORT DETAIL 9/17-M505 AND SUPPLEMENTAL COIL SUPPORTS.

3. PROVIDE SUPPORTS OF ALL UNIT COMPONENTS AS NEEDED FOR STRUCTURAL STABILITY. COORDINATE

COIL AND FILTER SUPPORT REQUIREMENTS WITH THE COIL AND FILTER MANUFACTURERS.

4. IF A SINGLE LARGER UNIT IS USED THE HUMIDIFIER(S) FACE VELOCITY MUST BE A MINIMUM OF 300 FPM AT

A UNIT OPERATION OF 30,000 CFM (AHU-1 APPROXIMATE TEMPORARY OPERATIONAL CFM).

5. IT IS ALLOWED FOR THE CONCRETE SLAB TO BE USED AS THE FLOOR OF THE TEMPORARY UNIT;

HOWEVER, THE FLOOR MAY NOT BE USED FOR THE ACCUMULATION OF CONDENSATE. CONDENSATE DRAIN PANS FOR THE COOLING COIL MUST BE PROVIDE AS PER DETAIL 5/17-M501 AND DISCHARGE PIPING

ROUTED TO THE NEAREST FLOOR DRAIN.

KEY NOTES:

1. PROVIDE 6' X 7' TAP OFF DISCHARGE PLENUM. THE BOTTOM OF THE 120" X 48" SUPPLY DUCT TO BE 5'-8"

ABOVE FINISHED FLOOR.

2. COOLING COIL INSTALLATION: FIELD VERIFY EXISTING CONDITIONS. CASING HEIGHT TO BE COORDINATED

WITH EXISTING CONDITIONS, COIL BASE SUPPORT DETAIL 9/17-M505 AND SUPPLEMENTAL COIL SUPPORTS.

3. REMOVE LOUVER TO ALLOW FOR INSTALLATION OF TEMPORARY UNIT COMPONENTS. PROTECT FROM

DAMAGE AND REINSTALL AFTER REMOVAL OF TEMPORARY UNIT COMPONENTS.

4. FEED TEMPORARY UNIT COMPONENTS FROM EXISTING CHILLED WATER, HOT WATER, AND STEAM

CONNECTIONS.

5. DUCTWORK FROM THE OA LOUVER TO THE FINAL FILTER SHALL BE 10" PRESSURE CLASS.

6. DUCTWORK DOWNSTREAM OF THE SMOKE DAMPERS SHALL BE 6" PRESSURE CLASS.

7. INSTALL AND SUPPORT DUCTWORK PER ASCE 7.

8. PRIOR TO DUCT PENETRATION, CONTRACTOR SHALL ENSURE PROPER HAZARDOUS MATERIAL ABATEMENT.

9. PROVIDE 16 GAUGE BLANK OFF PANEL AT FAN DISCHARGE

10. SHEET METAL PANEL SEPARATING TEMPORARY UNIT 1 FROM TEMPORARY UNIT 2 TO BE DOUBLE WALL

INSULATED.

11. PROVIDE 3' WEATHER HOOD EXTENSION. PROVIDE 1/2" SCREEN AT BUILDING OPENING.

12. REMOVE LOUVER TO ALLOW FOR INSTALLATION OF TEMPORARY DUCTWORK. PROTECT LOUVER FROM

DAMAGE AND REINSTALL AFTER REMOVAL OF TEMPORARY DUCTWORK. PROVIDE WEATHER TIGHT SEAL

AROUND REMAINING OPENING WITH R-20 INSULATION.

SHEET NOTES:

1/4" = 1'-0"1

BUILDINGS 01 AND 17 - THIRD LEVEL AND ROOF - DUCTWORK

17.1

N

M

L

17.3

K

MECHANICAL HVAC

4" GHWS

4" GHWR UP

4" GHWS UP

4" G

H W

R

4" G

H W

R

HX-3

HX-1

P-10

P-8

4" GHWR

OFFICE A/C OPERATORS

A101

Project Number

Building Number

Drawing Number

Project Title

Location

Issue Date Checked Drawn

Drawing Title

Approved:

VA FORM 08 - 6231

A

CONSTRUCTION

DOCUMENTS

FULLY SPRINKLERED

Office of Construction and Facilities Management

U.S. Department of Veterans Affairs

B

C

D

E

F

21 4 5 6 7 8 9 10

Phase

STAMP

321 4 5 6 7 8 9 10

ARCHITECT/ENGINEER OF RECORD

InfraStructure, LLC 6910 Pacific Street, Suite 310 Omaha, NE 68106 Phone: (402) 554-0234

Specialized Engineering Solutions 10360 Ellison Circle Omaha, NE 68134 Phone: (402) 991-5520

NE COA NUMBER: CA-1620

Alesia Architecture P.C.

3705 North 200th Street Elkhorn, Nebraska 68022 Phone: (402) 291-6941

NE COA NUMBER: CA-0721

on e ei gh th in ch o ne f oo t th re e in ch es o ne f oo t

6" on e an d on e ha lf in ch es o ne f oo t on e in ch o ne f oo t

6" 6" th re e qu ar te rs in ch o ne f oo t on e ha lf in ch o ne f oo t th re e ei gh th s in ch o ne f oo t on e qu ar te r in ch o ne f oo t

A

B

C

D

E

F

12/24/2025A u to d e s k D o c s /1

-2

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C o rr e c t H

V A

C D e fi c ie n c ie s /6

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A

M

17-MP101-A

BUILDING 17 - BASEMENT LEVEL -

HYDRONIC PIPING - ADDITIVE BID ITEM I

Correct HVAC Deficiencies

4101 Woolworth Ave, Omaha, NE 68105

636-25-301

12/24/2025 JMM NAP

N

KEY NOTES:

1. REPLACE 3" GHWS AND GHWR WITH 4" PIPE BACK TO HEAT EXCHANGERS.

2. EXISTING PUMP TO REMAIN.

1/4" = 1'-0"1

BUILDING 17 - BASEMENT LEVEL - HYDRONIC PIPING - ADDITIVE BID ITEM I

17.1

N

M

L

17.3

K

4" LPS

4" GHWS

4" GHWR

H-AHU3-1

SF-3

SA-3

17-M403

H-AHU3-2

3 3

3" LPS

PF3-2

20X10

PF3-1

20X10

FF-3

20X10

1" LPC

CC-3

HC-3

Project Number

Building Number

Drawing Number

Project Title

Location

Issue Date Checked Drawn

Drawing Title

Approved:

VA FORM 08 - 6231

A

CONSTRUCTION

DOCUMENTS

FULLY SPRINKLERED

Office of Construction and Facilities Management

U.S. Department of Veterans Affairs

B

C

D

E

F

21 4 5 6 7 8 9 10

Phase

STAMP

321 4 5 6 7 8 9 10

ARCHITECT/ENGINEER OF RECORD

InfraStructure, LLC 6910 Pacific Street, Suite 310 Omaha, NE 68106 Phone: (402) 554-0234

Specialized Engineering Solutions 10360 Ellison Circle Omaha, NE 68134 Phone: (402) 991-5520

NE COA NUMBER: CA-1620

Alesia Architecture P.C.

3705 North 200th Street Elkhorn, Nebraska 68022 Phone: (402) 291-6941

NE COA NUMBER: CA-0721

on e ei gh th in ch o ne f oo t th re e in ch es o ne f oo t

6" on e an d on e ha lf in ch es o ne f oo t on e in ch o ne f oo t

6" 6" th re e qu ar te rs in ch o ne f oo t on e ha lf in ch o ne f oo t th re e ei gh th s in ch o ne f oo t on e qu ar te r in ch o ne f oo t

A

B

C

D

E

F

12/24/2025A u to d e s k D o c s /1

-2

-3

A E

C o rr e c t H

V A

C D e fi c ie n c ie s /6

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.B

.M E

P .R

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:4

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A

M

17-MP102

BUILDING 17 - MEZZANINE LEVEL -

HYDRONIC PIPING

Correct HVAC Deficiencies

4101 Woolworth Ave, Omaha, NE 68105

636-25-301

12/24/2025 JMM NAP

N

KEY NOTES:

1. ROUTE NEW CHILLED WATER PIPING OVER THE TOP OF NEW SOUND ATTENUATORS AND FAN ARRAYS TO

CONNECT TO NEW CHILLED WATER COIL LOCATIONS. PROVIDE NEW FLOOR DRAIN TO SERVE COOLING

COILS.

2. TOTAL OF EIGHT CHILLED WATER COILS.

3. PROVIDE UV LIGHT ARRAY MOUNTED A MINIMUM OF 12 INCHES DOWNSTREAM OF COOLING COIL.

4. 1” STEAM CONDENSATE DOWN TO BASEMENT LEVEL. CONNECT TO EXISTING STEAM CONDENSATE MAIN.

1/4" = 1'-0"1

BUILDING 17 - MEZZANINE LEVEL - HYDRONIC PIPING

17.1

N

M

L

17.3

K

SA-1

SF-1

H-AHU1-1 H-AHU1-2

4" LPS

17-M404

4" GHWR DN

4" GHWS DN

4" GHWR

4" GHWS

3 3

PF1-1

PF1-2

CC1-4W CC1-2E

FF-1

20X10

1" LPC

CC-1

CC-1

Project Number

Building Number

Drawing Number

Project Title

Location

Issue Date Checked Drawn

Drawing Title

Approved:

VA FORM 08 - 6231

A

CONSTRUCTION

DOCUMENTS

FULLY SPRINKLERED

Office of Construction and Facilities Management

U.S. Department of Veterans Affairs

B

C

D

E

F

21 4 5 6 7 8 9 10

Phase

STAMP

321 4 5 6 7 8 9 10

ARCHITECT/ENGINEER OF RECORD

InfraStructure, LLC 6910 Pacific Street, Suite 310 Omaha, NE 68106 Phone: (402) 554-0234

Specialized Engineering Solutions 10360 Ellison Circle Omaha, NE 68134 Phone: (402) 991-5520

NE COA NUMBER: CA-1620

Alesia Architecture P.C.

3705 North 200th Street Elkhorn, Nebraska 68022 Phone: (402) 291-6941

NE COA NUMBER: CA-0721

on e ei gh th in ch o ne f oo t th re e in ch es o ne f oo t

6" on e an d on e ha lf in ch es o ne f oo t on e in ch o ne f oo t

6" 6" th re e qu ar te rs in ch o ne f oo t on e ha lf in ch o ne f oo t th re e ei gh th s in ch o ne f oo t on e qu ar te r in ch o ne f oo t

A

B

C

D

E

F

12/24/2025A u to d e s k D o c s /1

-2

-3

A E

C o rr e c t H

V A

C D e fi c ie n c ie s /6

-3

.B

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P .R

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A

M

17-MP102-A

BUILDING 17 - MEZZANINE LEVEL -

HYDRONIC PIPING - ADDITIVE BID ITEM I

Correct HVAC Deficiencies

4101 Woolworth Ave, Omaha, NE 68105

636-25-301

12/24/2025 JMM NAP

N

KEY NOTES:

1. ROUTE NEW CHILLED WATER PIPING OVER THE TOP OF NEW SOUND ATTENUATORS AND FAN ARRAYS TO

CONNECT TO NEW CHILLED WATER COIL LOCATIONS. PROVIDE NEW FLOOR DRAIN TO SERVE COOLING

COILS.

2. TOTAL OF EIGHT CHILLED WATER COILS, SIX EXISTING CHILLED WATER COILS TO BE REUSED. REFER TO

SHEET 17-MD102 FOR ADDITIONAL INFORMATION.

3. PROVIDE UV LIGHT ARRAY MOUNTED A MINIMUM OF 12 INCHES DOWNSTREAM OF COOLING COIL.

4. 1” STEAM CONDENSATE DOWN TO BASEMENT LEVEL. CONNECT TO EXISTING STEAM CONDENSATE MAIN.

1/4" = 1'-0"1

BUILDING 17 - MEZZANINE LEVEL - HYDRONIC PIPING - ADDITIVE BID ITEM I

12 13 14 15 16 1717.A 17.B 17.C 17.D

17.1

N

M

L

17.3

K

1" LPC

3" LPS

TH-1 TH-2

TF-1 TF-2

TCC-1 TCC-2

THC-2THC-1

8" CWR

8" CWS

6" HWS

6" HWR

EXISTING HOUSEKEEPING PAD

EXISTING HOUSEKEEPING PAD

1 1/2" LPS

Project Number

Building Number

Drawing Number

Project Title

Location

Issue Date Checked Drawn

Drawing Title

Approved:

VA FORM 08 - 6231

A

CONSTRUCTION

DOCUMENTS

FULLY SPRINKLERED

Office of Construction and Facilities Management

U.S. Department of Veterans Affairs

B

C

D

E

F

21 4 5 6 7 8 9 10

Phase

STAMP

321 4 5 6 7 8 9 10

ARCHITECT/ENGINEER OF RECORD

InfraStructure, LLC 6910 Pacific Street, Suite 310 Omaha, NE 68106 Phone: (402) 554-0234

Specialized Engineering Solutions 10360 Ellison Circle Omaha, NE 68134 Phone: (402) 991-5520

NE COA NUMBER: CA-1620

Alesia Architecture P.C.

3705 North 200th Street Elkhorn, Nebraska 68022 Phone: (402) 291-6941

NE COA NUMBER: CA-0721

on e ei gh th in ch o ne f oo t th re e in ch es o ne f oo t

6" on e an d on e ha lf in ch es o ne f oo t on e in ch o ne f oo t

6" 6" th re e qu ar te rs in ch o ne f oo t on e ha lf in ch o ne f oo t th re e ei gh th s in ch o ne f oo t on e qu ar te r in ch o ne f oo t

A

B

C

D

E

F

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1-MP103

BUILDING 01 - THIRD LEVEL -

HYDRONIC PIPING

Correct HVAC Deficiencies

4101 Woolworth Ave, Omaha, NE 68105

636-25-301

12/24/2025 JMM NAP

N

1/4" = 1'-0"1

BUILDING 01 - THIRD LEVEL - HYDRONIC PIPING

MEZZANINE LEVEL

241' - 4"

L 17.3 K

17-M401

AHU-2AHU-2

40x60 SA x2

S

A x2

S

A

144x40 SA

PLENUM 2

BUILDING 17 ROOF

259' - 4"

MEZZANINE LEVEL

241' - 4"

L17.3

84x84 SA

54x84 SA

BUILDING 17 ROOF

259' - 4"

SDSD

FF-3

MEZZANINE LEVEL

241' - 4"

12 13 1417.B 17.C

17-M401 x1

O

A 40x144 SA x1

S

A

40x108 SA

54x108

54x60 SA

CDCD

x6

S

A x6

S

A

38ø SA

60x40 SA

AHU-2AHU-2

40ø SA

15' - 0"

8' - 8"

17-M401

54x60 SA

38ø SA

17-M403

17-M404

BUILDING 17 ROOF

259' - 4"

CONTROL PANELS

Project Number

Building Number

Drawing Number

Project Title

Location

Issue Date Checked Drawn

Drawing Title

Approved:

VA FORM 08 - 6231

A

CONSTRUCTION

DOCUMENTS

FULLY SPRINKLERED

Office of Construction and Facilities Management

U.S. Department of Veterans Affairs

B

C

D

E

F

21 4 5 6 7 8 9 10

Phase

STAMP

321 4 5 6 7 8 9 10

ARCHITECT/ENGINEER OF RECORD

InfraStructure, LLC 6910 Pacific Street, Suite 310 Omaha, NE 68106 Phone: (402) 554-0234

Specialized Engineering Solutions 10360 Ellison Circle Omaha, NE 68134 Phone: (402) 991-5520

NE COA NUMBER: CA-1620

Alesia Architecture P.C.

3705 North 200th Street Elkhorn, Nebraska 68022 Phone: (402) 291-6941

NE COA NUMBER: CA-0721

on e ei gh th in ch o ne f oo t th re e in ch es o ne f oo t

6" on e an d on e ha lf in ch es o ne f oo t on e in ch o ne f oo t

6" 6" th re e qu ar te rs in ch o ne f oo t on e ha lf in ch o ne f oo t th re e ei gh th s in ch o ne f oo t on e qu ar te r in ch o ne f oo t

A

B

C

D

E

F

12/24/2025A u to d e s k D o c s /1

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A

M

17-M401

BUILDING 17 - MECHANICAL

SECTIONS

Correct HVAC Deficiencies

4101 Woolworth Ave, Omaha, NE 68105

636-25-301

12/24/2025 JMM NAP

KEY NOTES:

1. 48 X 108 TO BE CAPPED UNDER INITIAL TEMPORARY BACKFEED OF AHU-1 DOWNSTREAM DUCTWORK; REFER

TO 17-MH102 WORK FOR REFERENCE.

2. CAPPED UNDER BASE BID.

1/2" = 1'-0"2

SECTION AT AHU-2

1/2" = 1'-0"3

SECTION AT AHU-3

1/2" = 1'-0"1

SECTION AT AHU-2

12 13 1417.B 17.C

17-M402

40x144 SA x1

S

A x1

S

A

54x108

CDCD

x1

O

A

(TYP. 4)

54x60 SA

38ø SA

60x40 SA

PLENUM

17-M401

17-M403

17-M404

BUILDING 17 ROOF

259' - 4"

CONTROL PANELS

AHU-2

MEZZANINE LEVEL

241' - 4"

L 17.3 K

17-M402

52ø SA

40x60 SA

40x60 SA60x24 SA

60x24 SA

144x40 SA

AHU-2AHU-2

108x70 SA

PLENUM

4' - 8"

PLENUM

PLENUM

38ø SA

BUILDING 17 ROOF

259' - 4"

Project Number

Building Number

Drawing Number

Project Title

Location

Issue Date Checked Drawn

Drawing Title

Approved:

VA FORM 08 - 6231

A

CONSTRUCTION

DOCUMENTS

FULLY SPRINKLERED

Office of Construction and Facilities Management

U.S. Department of Veterans Affairs

B

C

D

E

F

21 4 5 6 7 8 9 10

Phase

STAMP

321 4 5 6 7 8 9 10

ARCHITECT/ENGINEER OF RECORD

InfraStructure, LLC 6910 Pacific Street, Suite 310 Omaha, NE 68106 Phone: (402) 554-0234

Specialized Engineering Solutions 10360 Ellison Circle Omaha, NE 68134 Phone: (402) 991-5520

NE COA NUMBER: CA-1620

Alesia Architecture P.C.

3705 North 200th Street Elkhorn, Nebraska 68022 Phone: (402) 291-6941

NE COA NUMBER: CA-0721

on e ei gh th in ch o ne f oo t th re e in ch es o ne f oo t

6" on e an d on e ha lf in ch es o ne f oo t on e in ch o ne f oo t

6" 6" th re e qu ar te rs in ch o ne f oo t on e ha lf in ch o ne f oo t th re e ei gh th s in ch o ne f oo t on e qu ar te r in ch o ne f oo t

A

B

C

D

E

F

12/24/2025A u to d e s k D o c s /1

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M

17-M402

BUILDING 17 - MECHANICAL

SECTIONS - ADDITIVE BID ITEM I

Correct HVAC Deficiencies

4101 Woolworth Ave, Omaha, NE 68105

636-25-301

12/24/2025 JMM NAP

KEY NOTES:

1. COORDINATE REMOVAL OF EXISTING DUCTWORK WITH INSTALLATION OF TEMPORARY DUCT AS INDICATED.

TOP 40 X 60 TAP PROVIDED AND ACTIVE UNDER INITIAL TIE-IN. BOTTOM 40X60 TAP TO BE CAPPED UNDER

INTIAL INSTALLATION OF 108X70 SA PLENUM.

2. CONNECT BOTTOM 40 X 60 DUCT INTO NEW 120 X 48 AHU-1 SUPPLY AIR PLENUM AS PART OF TIE-IN OF AHU-1 UPGRADE. REMOVAL OF EXISTING AND TIE-IN OF TEMPORARY AND INITIATION OF TEMPORARY AIRFLOW MUST OCCUR WITHIN A FOUR HOUR WINDOW. FINAL TIE-IN OF UPGRADED AHU-1 WORK AND SHUT DOWN OF

TEMPORARY AIR HANDLING UNIT TO OCCUR WITHIN A FOUR HOUR WINDOW.

1/2" = 1'-0"1

SECTION AT AHU-2 - ADDITIVE BID ITEM I

1/2" = 1'-0"2

SECTION AT AHU-2 - ADDITIVE BID ITEM I

17.2 17.1NM

SECOND LEVEL

247' - 1 1/4"

17-M402

17-M401

PF3-1PF3-2

H-AHU3-1

SF-3SA-3FF-3

SDSD

6" CWS

6" CWR 4" LPS

4" GHWS

4" GHWR

BUILDING 17 ROOF

259' - 4"

2" CD

CC-1

HC-1

24" MIN.36" MIN.

36" MIN.48" MIN.

30" MIN.

30" MIN.

Project Number

Building Number

Drawing Number

Project Title

Location

Issue Date Checked Drawn

Drawing Title

Approved:

VA FORM 08 - 6231

A

CONSTRUCTION

DOCUMENTS

FULLY SPRINKLERED

Office of Construction and Facilities Management

U.S. Department of Veterans Affairs

B

C

D

E

F

21 4 5 6 7 8 9 10

Phase

STAMP

321 4 5 6 7 8 9 10

ARCHITECT/ENGINEER OF RECORD

InfraStructure, LLC 6910 Pacific Street, Suite 310 Omaha, NE 68106 Phone: (402) 554-0234

Specialized Engineering Solutions 10360 Ellison Circle Omaha, NE 68134 Phone: (402) 991-5520

NE COA NUMBER: CA-1620

Alesia Architecture P.C.

3705 North 200th Street Elkhorn, Nebraska 68022 Phone: (402) 291-6941

NE COA NUMBER: CA-0721

on e ei gh th in ch o ne f oo t th re e in ch es o ne f oo t

6" on e an d on e ha lf in ch es o ne f oo t on e in ch o ne f oo t

6" 6" th re e qu ar te rs in ch o ne f oo t on e ha lf in ch o ne f oo t th re e ei gh th s in ch o ne f oo t on e qu ar te r in ch o ne f oo t

A

B

C

D

E

F

12/24/2025A u to d e s k D o c s /1

-2

-3

A E

C o rr e c t H

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C D e fi c ie n c ie s /6

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P .R

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A

M

17-M403

BUILDING 17 - MECHANICAL

SECTIONS - AHU-3

Correct HVAC Deficiencies

4101 Woolworth Ave, Omaha, NE 68105

636-25-301

12/24/2025 JMM NAP

1/2" = 1'-0"1

AHU-3 SECTION

KEY NOTES:

1. PROVIDE 16 GAUGE BLANK OFF PLATE, SEAL ALL MATING SECTIONS TO SMACNA SEAL CLASS A.

2. 4 INCH 16 GAUGE DOUBLE WALL INSULATED BLANK OFF.

MN17.1 17.217.217.1 N M

SECOND LEVEL

247' - 1 1/4"

17-M402

PF1-1

H-AHU1-2

SF-1 SA-1

FF-1

SDSD

4" LPS

4" GHWR

4" GHWS

PF1-2

BUILDING 17 ROOF

259' - 4"

8' X 3' MOTORIZED DAMPER

16 GAUGE BLANK OFF PLATE

4" DOUBLE WALL INSULATED PLENUM

1" LPC

30" MIN.48" MIN.36" MIN.

30" MIN.

30" MIN.

HC-1

CC-1

Project Number

Building Number

Drawing Number

Project Title

Location

Issue Date Checked Drawn

Drawing Title

Approved:

VA FORM 08 - 6231

A

CONSTRUCTION

DOCUMENTS

FULLY SPRINKLERED

Office of Construction and Facilities Management

U.S. Department of Veterans Affairs

B

C

D

E

F

21 4 5 6 7 8 9 10

Phase

STAMP

321 4 5 6 7 8 9 10

ARCHITECT/ENGINEER OF RECORD

InfraStructure, LLC 6910 Pacific Street, Suite 310 Omaha, NE 68106 Phone: (402) 554-0234

Specialized Engineering Solutions 10360 Ellison Circle Omaha, NE 68134 Phone: (402) 991-5520

NE COA NUMBER: CA-1620

Alesia Architecture P.C.

3705 North 200th Street Elkhorn, Nebraska 68022 Phone: (402) 291-6941

NE COA NUMBER: CA-0721

on e ei gh th in ch o ne f oo t th re e in ch es o ne f oo t

6" on e an d on e ha lf in ch es o ne f oo t on e in ch o ne f oo t

6" 6" th re e qu ar te rs in ch o ne f oo t on e ha lf in ch o ne f oo t th re e ei gh th s in ch o ne f oo t on e qu ar te r in ch o ne f oo t

A

B

C

D

E

F

12/24/2025A u to d e s k D o c s /1

-2

-3

A E

C o rr e c t H

V A

C D e fi c ie n c ie s /6

-3

.B

.M E

P .R

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/2 /2

:4

:2

A

M

17-M404

BUILDING 17 - MECHANICAL

SECTIONS - ADDITIVE BID ITEM I

Correct HVAC Deficiencies

4101 Woolworth Ave, Omaha, NE 68105

636-25-301

12/24/2025 JMM NAP

1/2" = 1'-0"1

AHU-1 SECTION - ADDITIVE BID ITEM I

KEY NOTES:

1. HEATING COIL SHALL HAVE A MINIMUM CLEARANCE OF 30" FROM THE LOWER LEVEL PLENUM. HC-1

COMPOSED OF 6 COIL SECTIONS REFER TO 17-MP102A FOR ADDITIONAL INFORMATION.

2. PROVIDE 16 GAUGE BLANK OFF PLATE, SEAL ALL MATING SECTIONS TO SMACNA SEAL CLASS A.

3. CC-1 COMPOSED OF 8 COIL SECTIONS 17-MP102A FOR ADDITIONAL INFORMATION.

4. 4 INCH 16 GAUGE DOUBLE WALL INSULATED BLANK OFF.

POINTS LIST GENERAL NOTE:

ALL POINTS LISTS ARE PROVIDED TO CLARIFY INTENT AND ASSIST THE CONTRACTOR

IN UNDERSTANDING CONTROLS BIDDING REQUIREMENTS. NOT ALL POINTS REQUIRED

FOR THE PROJECT ARE COVERED BY THE POINTS LISTS. THE SPECIFICATIONS,

SEQUENCES OF OPERATIONS AND ANY SCHEMATICS PROVIDED ARE TO BE USED IN

CONJUNCTION WITH THE POINTS LIST FOR THE BASIS OF THE CONTRACTORS BID. ANY

DISCREPANCIES BETWEEN THE POINTS LISTS AND THE OTHER CONTROLS

DOCUMENTS NOTED DEFAULT TO THE MORE STRINGENT REQUIREMENT.

GENERAL NOTES

1. SERVICE DISCONNECT PROVIDED AND INSTALLED BY ELECTRICAL CONTRACTOR SHALL BE LOCATED WITHIN 6 FEET OF

CONTROLLER.

2. CONTROLLER SHALL HAVE A MINIMUM SERVICE CLEARANCE OF 36 INCHES.

3. WIRE ALL SENSORS AND CONTROL DEVICES BACK TO CONTROLLER.

4. COORDINATE ALL CASING AND DUCT PENETRATIONS WITH FURNISHING CONTRACTOR. ENSURE ALL PENETRATIONS ARE

PROPERLY SEALED.

SEQUENCE OF OPERATION

DESCRIPTION:

THE AIR HANDLING UNIT IS A VARIABLE VOLUME UNIT THAT NORMALLY OPERATES AT CONSTANT VOLUME. OVER TIME THE CONSTANT VOLUME SETPOINT WILL BE AMENDED AS PATIENT FLOORS ARE SERVED BY NEW UNITS LOCATED IN THE NEW AHU TOWER. UNIT CONSISTS OF SUPPLY FANS WITH VFDS, OUTDOOR AIR DAMPER, PRE-FILTER BANK, HOT GLYCOL HEATING COIL, CHILLED WATER COOLING COIL, UV LIGHTS, STEAM HUMIDIFIER, FINAL FILTER

BANK AND UNIT ISOLATION SMOKE DAMPER.

SUPPLY FAN CONTROL:

START/STOP: THE DDC SYSTEM SHALL START THE SUPPLY FANS VIA THE VFDs WITH A TIME DELAY TO ALLOW ALL FIRE/SMOKE AND SMOKE DAMPERS IN THE AIR HANDLING SYSTEM TO OPEN PRIOR TO SUPPLY FAN OPERATION. THE

SUPPLY FANS SHALL RUN CONTINUOUSLY.

VFD RESET: IN CASE OF VFD FAULT DETECTION, THE DDC SYSTEM SHALL WAIT 30 SECONDS (ADJUSTABLE) AND THEN CALL THE VFD TO START. IF THE VFD DOES NOT START, THE DDC SYSTEM SHALL CALL A SECOND TIME. IF THE

VFD STILL HAS NOT STARTED, AN ALARM SHALL BE SENT TO THE OPERATOR INTERFACE.

CURRENT STATUS SWITCH: INSTALL A CURRENT STATUS SWITCH FOR EACH INDIVIDUAL SUPPLY FAN AND REPORT STATUS TO BMS. IF THE CURRENT STATUS SWITCH DOES NOT PROVE OPERATION OF A GIVEN FAN IN VFD OR BYPASS MODE, SEND AN ALARM TO THE OPERATOR INTERFACE. IF THE CURRENT STATUS SWITCH FOR ALL FANS DOES NOT PROVE OPERATION, THE UNIT SHALL SHUT DOWN AND SEND AN ALARM TO THE OPERATOR INTERFACE.

SPEED CONTROL: PURPOSE OF THE SUPPLY FAN CONTROL IS TO MAINTAIN A MINIMUM STATIC PRESSURE IN THE SUPPLY DUCT WORK, THE DDC SYSTEM SHALL CONTROL THE SUPPLY FAN VFD IN UNISON FROM THE SUPPLY DUCT DIFFERENTIAL PRESSURE TRANSMITTER SIGNALS ASSOCIATED WITH AIR HANDLER 3 UPGRADE. INITIAL SET POINT SHALL BE SET BY THE TEST AND BALANCE CONTRACTOR MEASURING THE DUCT STATIC PRESSURE IN THE DUCT AT THE LOCATION OF THE NEW SENSOR. THE NEW SENSOR SHALL BE USED AS THE CONTROL POINT FOR THE TEMPORARY UNIT WHEN BACKFEEDING THIS UNIT AND AS THE FINAL SENSOR FOR THIS UNIT. THIS SETPOINT SHALL BE ADJUSTABLE WITH FINAL SETPOINT OPTIMIZED BY THE BALANCING CONTRACTOR WHEN THE UPDATED UNIT IS BROUGHT ONLINE.

HIGH PRESSURE LIMIT: DIFFERENTIAL PRESSURE SWITCH SHALL BE A MANUAL RESET TYPE AND WIRED IN SERIES WITH THE START/STOP CONTROL OF THE SUPPLY FAN. THE DDC SYSTEM SHALL MONITOR THE STATUS OF THE

DIFFERENTIAL PRESSURE SWITCH. INITIAL SETPOINT SHALL BE +8.0" W.C. (ADJUSTABLE).

HIGH SUCTION PRESSURE LIMIT: DIFFERENTIAL PRESSURE SWITCH SHALL BE A MANUAL RESET TYPE AND WIRED IN SERIES WITH THE START/STOP CONTROL OF THE SUPPLY FAN. THE DDC SYSTEM SHALL MONITOR THE STATUS OF THE DIFFERENTIAL PRESSURE SWITCH. INITIAL SETPOINT SHALL BE -8.0" W.C. (ADJUSTABLE).

DISCHARGE AIR CONTROL: DISCHARGE AIR TEMPERATURE SETPOINT SHALL BE 55ºF (ADJUSTABLE). ALL SETPOINTS SHALL BE ADJUSTABLE AT THE OPERATOR INTERFACE.

WHENEVER THE DISCHARGE AIR TEMPERATURE IS ABOVE THE SETPOINT, THE FOLLOWING SHALL OCCUR IN SEQUENCE:

1. THE HEATING COIL CONTROL VALVE(S) SHALL MODULATE CLOSED.

2. THE DDC SYSTEM SHALL MODULATE THE CHILLED WATER CONTROL VALVE(S) OPEN.

3. IF THE DISCHARGE AIR TEMPERATURE IS MORE THAN 10ºF (ADJUSTABLE) ABOVE THE SETPOINT, SEND AN ALARM TO THE OPERATOR INTERFACE.

WHENEVER THE DISCHARGE AIR TEMPERATURE IS BELOW THE SETPOINT, THE FOLLOWING SHALL OCCUR IN SEQUENCE:

1. THE CHILLED WATER CONTROL VALVE(S) SHALL MODULATE CLOSED.

2. THE HEATING COIL CONTROL VALVE SHALL MODULATE OPEN TO MAINTAIN SETPOINT.

3. IF THE DISCHARGE AIR TEMPERATURE IS MORE THAN 10ºF (ADJUSTABLE) BELOW THE SETPOINT, SEND AN ALARM TO THE OPERATOR INTERFACE.

COOLING AND HEATING COILS HEAT RECOVERY MODE:

IN UNIT HEATING MODE THE AIR HANDLING UNIT PREHEAT COIL AND COOLING COIL WORK IN CONCERT TO RECOVERY COOLING ENERGY FROM THE OUTSIDE AIR STREAM AS A MEANS OF HEAT RECOVERY FOR THE BUILDINGS COOLING SYSTEM. THE INTENT IS FOR THE COILS TO WORK IN CONCERT TO PROVIDE CHILLED WATER RETURN AS LOW AS 50 DEGF (ADJUSTABLE) CHILLED WATER RETURN TEMPERATURE FROM THE AIR HANDLING UNIT COOLING

COIL. SEQUENCE AS FOLLOWS:

PREHEAT COIL DISCHARGE AIR TEMPERATURE (DAT) INITIAL SETPOINT SHALL BE 42 DEGF (ADJUSTABLE). IN HEATING MODE THE CHILLED WATER (DAT) COIL SHALL MODULATE TO MAINTAIN UNIT DISCHARGE AIR TEMPERATURE SETPOINT. MONITOR COIL CHILLED WATER COIL RETURN TEMPERATURE. IF CHILLED WATER RETURN TEMPERATURE IS GREATER THAN 55 DEGF (ADJUSTABLE), DECREASE PREHEAT COIL DISCHARGE AIR SETPOINT BY ONE DEGF. IF AFTER THIRTY MINUTES THE CHILLED WATER RETURN TEMPERATURE REMAINS GREATER THAN 55 DEGF DECREASE PREHEAT COIL BY ANOTHER DEGF. PREHEAT RESET TEMPERATURE TO NOT GO BELOW 38 DEGF (ADJUSTABLE).

IF CHILLED WATER COIL RETURN TEMPERATURE DROPS BELOW 50 DEGF INCREASE PREHEAT COIL DISCHARGE AIR TEMPERATURE BY 1 DEGF. IF AFTER 30 MINUTES THE CHILLED WATER COIL RETURN TEMPERATURE REMAINS BELOW 50 DEGF INCREASE PREHEAT COIL DISCHARGE AIR TEMPERATURE ANOTHER 1 DEGF. MAXIMUM PREHEAT COIL DAT SETPOINT SHALL BE 46 DEGF (ADJUSTABLE).

HUMIDIFIER CONTROL: USE EXISTING HUMIDITY SENSORS IN THE AREAS SERVED BY AHU-3 TO INITIATE AND CONTROL THE HUMIDIFIER. IF THE AVERAGE HUMIDITY OF THE EXISTING SENSORS SERVING THE AHU-3 AREA IS LESS THAN 30% (ADJUSTABLE) INITIATE HUMIDIFICATION TO CONTROL AVERAGE HUMIDITY TO 30% (ADJUSTABLE). The DDC SYSTEM SHALL OVERRIDE THE SIGNAL TO THE HUMIDIFIER CONTROL VALVE TO LIMIT THE SUPPLY AIR RELATIVE HUMIDITY TO A MAXIMUM OF 70% (ADJUSTABLE). IF THE SUPPLY OR RELATIVE HUMIDITY EXCEEDS 75% (ADJUSTABLE) AN ALARM SHALL BE SENT TO THE OPERATOR INTERFACE. WHENEVER THE OUTDOOR AIR BULB REFERENCE TEMPERATURE IS ABOVE 40 DEGREESF (ADJUSTABLE) THE DDC SYSTEM SHALL CLOSE THE HUMIDIFIER CONTROL VALVE AND DISABLE ANY ALARMS.

VENTILATION AIR CONTROL:

AIRFLOW STATION: AIR INLET PROBES ON SUPPLY FANS SHALL BE USED TO MONITOR SYSTEM AIRFLOW. PROVIDE COMBINED AIRFLOW VALUE TO DDC FROM ALL FAN MONITORS.

UV LIGHTS: THE UV LIGHTS SHALL BE ENABLED WHENEVER THE AIR HANDLING UNIT IS ENABLED AND RUN CONTINUOUSLY. MONITOR RUN-HOURS AND PROVIDE MAINTENANCE ALARMS AT INTERVALS RECOMMENDED BY THE MANUFACTURER. UV LIGHTS SHALL BE HARDWIRED TO THE AIR HANDLING UNIT DOOR SWITCH. IN THE EVENT THE DOOR OPENS, THE LIGHTS SHALL BE DISABLED.

UNIT SHUTDOWN:

THE SUPPLY FANS SHALL STOP.

THE OUTSIDE AIR DAMPER SHALL CLOSE.

THE CHILLED WATER CONTROL VALVE(S) SHALL CLOSE.

THE HUMIDIFIER CONTROL VALVE SHALL CLOSE.

THE HEATING COIL CONTROL VALVE(S) SHALL CLOSE. FREEZESTAT SHALL OVERRIDE HEATING CONTROL VALVE(S) AS REQUIRED.

ALL FIRE/SMOKE AND SMOKE DAMPERS ASSOCIATED WITH THE AIR HANDLING SYSTEM SHALL CLOSE.

FILTER MONITORING:

FOR EACH FILTER BANK WITH RATING OF MERV 8 AND BELOW, PROVIDE AN ALARM TO THE OPERATOR INTERFACE WHEN THE DIFFERENTIAL STATIC PRESSURE EXCEEDS 0.6" W.C. (ADJUSTABLE).

FOR EACH FILTER BANK WITH RATING OF MERV 9 TO MERV 16, PROVIDE AN ALARM TO THE OPERATOR INTERFACE WHEN THE DIFFERENTIAL STATIC PRESSURE EXCEEDS 1.0" W.C. (ADJUSTABLE).

FOR EACH FILTER BANK WITH RATING OF MERV 17 AND ABOVE, PROVIDE AN ALARM TO THE OPERATOR INTERFACE WHEN THE DIFFERENTIAL STATIC PRESSURE EXCEEDS 2.0" W.C. (ADJUSTABLE).

ALARM MONITORING:

FREEZE PROTECTION: INSTALL AN ELECTRIC FREEZESTAT DOWNSTREAM OF THE HEATING COIL PER MANUFACTURER'S RECOMMENDATION. PROVIDE A STAGED FREEZE PROTECTION APPROACH AS INDICATED BELOW.

1. IF THE HEATING COIL DISCHARGE AIR TEMPERATURE DROPS BELOW 40°F (ADJUSTABLE) FOR 5 MINUTES, OVERRIDE THE OUTSIDE AIR DAMPER TO MAINTAIN THE MINIMUM OUTSIDE AIRFLOW AND MODULATE THE HEATING

COIL CONTROL VALVE TO MAINTAIN A HEATING COIL DISCHARGE AIR TEMPERATURE OF AT LEAST 55ºF (ADJUSTABLE). DISABLE THIS FUNCTION WHEN THE HEATING COIL DISCHARGE AIR TEMPERATURE RISES ABOVE 45ºF

(ADJUSTABLE) FOR 5 MINUTES.

2. IF THE HEATING COIL DISCHARGE AIR TEMPERATURE DROPS BELOW 38 DEGF ADJUSTABLE FOR 5 MINUTES, SEND AN ALARM TO THE BUILDING MANAGEMENT SYSTEM. IF DISCHARGE AIR TEMPERATURE DROPS BELOW 36 DEGF SHUT THE AIR HANDLING UNIT DOWN, CLOSE THE OUTSIDE AIR DAMPER AND SEND AN ALARM TO THE BUILDING MANAGEMENT SYSTEM.

3. IF THE FREEZESTAT SENSES A TEMPERATURE AT OR BELOW 32ºF (ADJUSTABLE), SHUT DOWN THE SUPPLY FANS, CLOSE THE OUTDOOR AIR DAMPER, OPEN THE COOLING COIL CONTROL VALVE TO 100%. MODULATE THE HEATING COIL CONTROL VALVE TO MAINTAIN A HEATING COIL DISCHARGE AIR TEMPERATURE OF 80ºF (ADJUSTABLE). THE FREEZESTAT SHALL SHUT DOWN THE UNIT INDEPENDENTLY OF THE DDC SYSTEM VIA RELAYS. A SECOND SET OF CONTACTS SHALL NOTIFY THE DDC SYSTEM THAT SHALL SEND AN ALARM TO THE OPERATOR INTERFACE (MANUAL RESET TYPE).

FIRE ALARM INTERFACE: WHEN SMOKE DETECTORS AT THE OUTSIDE AIR INLET AND UNIT DISCHARGE ARE INITIATED, THE UNIT SHALL SHUT DOWN AND THE ISOLATION SMOKE DAMPERS AT THE INLET AND OUTLET OF THE AIR HANDLING UNIT SHALL CLOSE. THE FIRE ALARM SYSTEM SHALL NOTIFY THE OPERATOR INTERFACE WHENEVER AN ALARM CONDITION IS EXPERIENCED AT THE UNIT OR IN AREAS SERVED BY THE UNIT.

WITH THE EXCEPTION OF HARDWIRED SAFETIES (FREEZESTAT, ISOLATION SMOKE DAMPERS, HIGH SUCTION AND HIGH DISCHARGE PRESSURES) ALL AIR HANDLING UNIT AND GLYCOL HEATING HOT WATER SETPOINTS TO BE ADJUSTABLE THROUGH THE GRAPHIC INTERFACE. ADJUSTMENT INCLUDES BUT IS NOT LIMITED TO: VARIABLE SPEED DRIVES; HEATING, COOLING AND HUMIDIFIER CONTROL VALVES; HEATING HOT WATER PUMP SPEED, PREHEAT COIL DISCHARGE AIR TEMPERATURE SETPOINT, CHILLED WATER COIL DISCHARGE AIR TEMPERATURE SETPOINT.

OUTDOOR AIR

VFD

VFDS

M

P

T

F T RH

T

P P RH T M

S P

P

30 32 33

34 38

39 40 41 42

31 37

RH T

T

T

P

REMARKS:

1. E = ELECTRIC P = PNEUMATIC BO = BY OTHERS S = REFERENCED POINT FROM HARDWIRE ELSEWHERE ON DDC NETWORK

2. A = ANALOG B = BINARY

3. I = INPUT O = OUTPUT

4. G = GENERAL C = CRITICAL H = HIGH LIMIT L = LOW LIMIT F = FAILURE

5. T = TRENDING EH = EVENT HISTORY AR = ARCHIVE TT = TOTALIZATION GP = GRAPHICAL POINT

Project Number

Building Number

Drawing Number

Project Title

Location

Issue Date Checked Drawn

Drawing Title

Approved:

VA FORM 08 - 6231

A

CONSTRUCTION

DOCUMENTS

FULLY SPRINKLERED

Office of Construction and Facilities Management

U.S. Department of Veterans Affairs

B

C

D

E

F

21 4 5 6 7 8 9 10

Phase

STAMP

321 4 5 6 7 8 9 10

ARCHITECT/ENGINEER OF RECORD

InfraStructure, LLC 6910 Pacific Street, Suite 310 Omaha, NE 68106 Phone: (402) 554-0234

Specialized Engineering Solutions 10360 Ellison Circle Omaha, NE 68134 Phone: (402) 991-5520

NE COA NUMBER: CA-1620

Alesia Architecture P.C.

3705 North 200th Street Elkhorn, Nebraska 68022 Phone: (402) 291-6941

NE COA NUMBER: CA-0721

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6" 6" th re e qu ar te rs in ch o ne f oo t on e ha lf in ch o ne f oo t th re e ei gh th s in ch o ne f oo t on e qu ar te r in ch o ne f oo t

A

B

C

D

E

F

12/24/2025A u to d e s k D o c s /1

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-3

A E

C o rr e c t H

V A

C D e fi c ie n c ie s /6

-3

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/2 /2

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A

M

17-M501

BUILDING 17 - MECHANICAL

CONTROLS - AHU-3

Correct HVAC Deficiencies

4101 Woolworth Ave, Omaha, NE 68105

636-25-301

12/24/2025 JMM NAP

NO SCALE1

AHU-3 CONTROL SEQUENCE

DIRECT DIGITAL CONTROL POINTS LIST - AHU #3

POINT

ID POINT DESCRIPTION SOURCE (1) TYPE (2) I/O (3)

SETPOINT

ADJUSTMENT ALARMS (4)

APPLICATIONS

(5) UNITS

6 SUPPLY FAN VFD STATUS E B I NO G, F EH, AR -

7 SUPPLY FAN VFD START/STOP E B O NO - - -

8 SUPPLY FAN VFD SPEED CONTROL E A O YES - T, AR, GP % SPEED

9 SUPPLY FAN CURRENT STATUS SWITCH E B I NO G, F EH, AR ON / OFF

20 OUTDOOR AIR ISOLATION DAMPER POSITION E B I NO - EH, AR, GP OPEN / CLOSED

21 OUTDOOR AIR ISOLATION DAMPER ACTUATOR E B I NO - EH, AR, GP OPEN / CLOSED

22 SUPPLY FAN SUCTION STATIC PRESSURE SWITCH E B I YES C, H EH, AR, GP INCHES W.C.

25 HEATING WATER COIL CONTROL VALVE E A O NO - - -

26 HEATING WATER TEMPERATURE - RETURN E A I NO - T, AR, GP DEGREES F

27 PRE-FILTER MERV 8 DIFFERENTIAL PRESSURE E A I YES G, H T, EH, AR, GP INCHES W.C.

28 HEATING WATER TEMPERATURE - SUPPLY E A I NO - T, AR, GP DEGREES F

29 PRE-FILTER MERV 11 DIFFERENTIAL PRESSURE E A I YES G, H T, EH, AR, GP INCHES W.C.

30 FREEZESTAT ALARM E B I NO F EH, AR, GP NORMAL / ALARM

31 <varies> E A <varies> NO - <varies> <varies>

32 HEATING COIL DISCHARGE AIR TEMPERATURE E A I NO G, H, L T, AR, GP DEGREES F

33 HUMIDITY HIGH LIMIT ALARM E B I NO F EH, AR, GP -

34 CHILLED WATER TEMPERATURE - RETURN E A I NO - T, AR, GP DEGREES F

35 CHILLED WATER CONTROL VALVE E A O NO - - -

36 CHILLED WATER TEMPERATURE - SUPPLY E A I NO - T, AR, GP DEGREES F

37 UV LIGHT RUN HOURS E A I NO G EH, GP RUN HOURS

38 SUPPLY FAN AIRFLOW VOLUME E A I NO - T, AR, GP CFM

39 SUPPLY FAN DISCHARGE STATIC PRESSURE SWITCH E B I YES C, H EH, AR, GP INCHES W.C.

40 FINAL FILTER DIFFERENTIAL PRESSURE E A I YES G, H T, EH, AR, GP INCHES W.C.

41 SUPPLY AIR HUMIDITY E A I NO - T, AR, GP % RELATIVE HUMIDITY

42 SUPPLY AIR TEMPERATURE E A I NO - T, AR, GP DEGREES F

43 SUPPLY AIR TEMPERATURE SETPOINT E A O YES - T, AR, GP DEGREES F

45 AHU SUPPLY AIR ISOLATION DAMPER POSITION E B I NO - EH, AR, GP OPEN / CLOSED

46 SUPPLY DUCT STATIC PRESSURE E A I YES - T, AR, GP INCHES W.C.

47 OUTDOOR AIR REFERENCE TEMPERATURE S A I NO - T, AR, GP DEGREES F

48 OUTDOOR AIR REFERENCE HUMIDITY S A I NO - T, AR, GP % RELATIVE HUMIDITY

51 FIRE ALARM STATUS S B I NO C, F EH, AR NORMAL / ALARM

OUTDOOR AIR

VFD

VFDS

M

P

T

F T RH

T

P P RH T M

S P

P

30 32 33

34 38

39 40 41 42

31 37

T

T

P

GENERAL NOTES

1. SERVICE DISCONNECT PROVIDED AND INSTALLED BY ELECTRICAL CONTRACTOR SHALL BE LOCATED WITHIN 6 FEET OF

CONTROLLER.

2. CONTROLLER SHALL HAVE A MINIMUM SERVICE CLEARANCE OF 36 INCHES.

3. WIRE ALL SENSORS AND CONTROL DEVICES BACK TO CONTROLLER.

4. COORDINATE ALL CASING AND DUCT PENETRATIONS WITH FURNISHING CONTRACTOR. ENSURE ALL PENETRATIONS ARE

PROPERLY SEALED.

SEQUENCE OF OPERATION

DESCRIPTION:

THE AIR HANDLING UNIT IS A VARIABLE VOLUME UNIT THAT NORMALLY OPERATES AT CONSTANT VOLUME. OVER TIME THE CONSTANT VOLUME SETPOINT WILL BE AMENDED AS PATIENT FLOORS ARE SERVED BY NEW UNITS LOCATED IN THE NEW AHU TOWER. UNIT CONSISTS OF SUPPLY FANS WITH VFDS, OUTDOOR AIR DAMPER, PRE-FILTER BANK, HOT GLYCOL HEATING COIL, CHILLED WATER COOLING COIL, UV LIGHTS, STEAM HUMIDIFIER, FINAL FILTER

BANK AND UNIT ISOLATION SMOKE DAMPER.

SUPPLY FAN CONTROL:

START/STOP: THE DDC SYSTEM SHALL START THE SUPPLY FANS VIA THE VFDs WITH A TIME DELAY TO ALLOW ALL FIRE/SMOKE AND SMOKE DAMPERS IN THE AIR HANDLING SYSTEM TO OPEN PRIOR TO SUPPLY FAN OPERATION. THE

SUPPLY FANS SHALL RUN CONTINUOUSLY.

VFD RESET: IN CASE OF VFD FAULT DETECTION, THE DDC SYSTEM SHALL WAIT 30 SECONDS (ADJUSTABLE) AND THEN CALL THE VFD TO START. IF THE VFD DOES NOT START, THE DDC SYSTEM SHALL CALL A SECOND TIME. IF THE

VFD STILL HAS NOT STARTED, AN ALARM SHALL BE SENT TO THE OPERATOR INTERFACE.

CURRENT STATUS SWITCH: INSTALL A CURRENT STATUS SWITCH FOR EACH INDIVIDUAL SUPPLY FAN AND REPORT STATUS TO BMS. IF THE CURRENT STATUS SWITCH DOES NOT PROVE OPERATION OF A GIVEN FAN IN VFD OR BYPASS MODE, SEND AN ALARM TO THE OPERATOR INTERFACE. IF THE CURRENT STATUS SWITCH FOR ALL FANS DOES NOT PROVE OPERATION, THE UNIT SHALL SHUT DOWN AND SEND AN ALARM TO THE OPERATOR INTERFACE.

SPEED CONTROL: PURPOSE OF THE SUPPLY FAN CONTROL IS TO MAINTAIN A MINIMUM STATIC PRESSURE IN THE SUPPLY DUCT WORK, THE DDC SYSTEM SHALL CONTROL THE SUPPLY FAN VFD IN UNISON FROM THE SUPPLY DUCT DIFFERENTIAL PRESSURE TRANSMITTER SIGNALS ASSOCIATED WITH AIR HANDLER 1 UPGRADE. INITIAL SET POINT SHALL BE SET BY THE TEST AND BALANCE CONTRACTOR MEASURING THE DUCT STATIC PRESSURE IN THE DUCT AT THE LOCATION OF THE NEW SENSOR. THE NEW SENSOR SHALL BE USED AS THE CONTROL POINT FOR THE TEMPORARY UNIT WHEN BACKFEEDING THIS UNIT AND AS THE FINAL SENSOR FOR THIS UNIT. THIS SETPOINT SHALL BE ADJUSTABLE WITH FINAL SETPOINT OPTIMIZED BY THE BALANCING CONTRACTOR WHEN THE UPDATED UNIT IS BROUGHT ONLINE.

HIGH PRESSURE LIMIT: DIFFERENTIAL PRESSURE SWITCH SHALL BE A MANUAL RESET TYPE AND WIRED IN SERIES WITH THE START/STOP CONTROL OF THE SUPPLY FAN. THE DDC SYSTEM SHALL MONITOR THE STATUS OF THE

DIFFERENTIAL PRESSURE SWITCH. INITIAL SETPOINT SHALL BE +8.0" W.C. (ADJUSTABLE).

HIGH SUCTION PRESSURE LIMIT: DIFFERENTIAL PRESSURE SWITCH SHALL BE A MANUAL RESET TYPE AND WIRED IN SERIES WITH THE START/STOP CONTROL OF THE SUPPLY FAN. THE DDC SYSTEM SHALL MONITOR THE STATUS OF THE DIFFERENTIAL PRESSURE SWITCH. INITIAL SETPOINT SHALL BE -8.0" W.C. (ADJUSTABLE).

DISCHARGE AIR CONTROL: DISCHARGE AIR TEMPERATURE SETPOINT SHALL BE 55ºF (ADJUSTABLE). ALL SETPOINTS SHALL BE ADJUSTABLE AT THE OPERATOR INTERFACE.

WHENEVER THE DISCHARGE AIR TEMPERATURE IS ABOVE THE SETPOINT, THE FOLLOWING SHALL OCCUR IN SEQUENCE:

1. THE HEATING COIL CONTROL VALVE(S) SHALL MODULATE CLOSED.

2. THE DDC SYSTEM SHALL MODULATE THE CHILLED WATER CONTROL VALVE(S) OPEN.

3. IF THE DISCHARGE AIR TEMPERATURE IS MORE THAN 10ºF (ADJUSTABLE) ABOVE THE SETPOINT, SEND AN ALARM TO THE OPERATOR INTERFACE.

WHENEVER THE DISCHARGE AIR TEMPERATURE IS BELOW THE SETPOINT, THE FOLLOWING SHALL OCCUR IN SEQUENCE:

1. THE CHILLED WATER CONTROL VALVE(S) SHALL MODULATE CLOSED.

2. THE HEATING COIL CONTROL VALVE SHALL MODULATE OPEN TO MAINTAIN SETPOINT.

3. IF THE DISCHARGE AIR TEMPERATURE IS MORE THAN 10ºF (ADJUSTABLE) BELOW THE SETPOINT, SEND AN ALARM TO THE OPERATOR INTERFACE.

COOLING AND HEATING COILS HEAT RECOVERY MODE:

IN UNIT HEATING MODE THE AIR HANDLING UNIT PREHEAT COIL AND COOLING COIL WORK IN CONCERT TO RECOVERY COOLING ENERGY FROM THE OUTSIDE AIR STREAM AS A MEANS OF HEAT RECOVERY FOR THE BUILDINGS COOLING SYSTEM. THE INTENT IS FOR THE COILS TO WORK IN CONCERT TO PROVIDE CHILLED WATER RETURN AS LOW AS 50 DEGF (ADJUSTABLE) CHILLED WATER RETURN TEMPERATURE FROM THE AIR HANDLING UNIT COOLING

COIL. SEQUENCE AS FOLLOWS:

PREHEAT COIL DISCHARGE AIR TEMPERATURE (DAT) INITIAL SETPOINT SHALL BE 42 DEGF (ADJUSTABLE). IN HEATING MODE THE CHILLED WATER (DAT) COIL SHALL MODULATE TO MAINTAIN UNIT DISCHARGE AIR TEMPERATURE SETPOINT. MONITOR COIL CHILLED WATER COIL RETURN TEMPERATURE. IF CHILLED WATER RETURN TEMPERATURE IS GREATER THAN 55 DEGF (ADJUSTABLE), DECREASE PREHEAT COIL DISCHARGE AIR SETPOINT BY ONE DEGF. IF AFTER THIRTY MINUTES THE CHILLED WATER RETURN TEMPERATURE REMAINS GREATER THAN 55 DEGF DECREASE PREHEAT COIL BY ANOTHER DEGF. PREHEAT RESET TEMPERATURE TO NOT GO BELOW 38 DEGF (ADJUSTABLE).

IF CHILLED WATER COIL RETURN TEMPERATURE DROPS BELOW 50 DEGF INCREASE PREHEAT COIL DISCHARGE AIR TEMPERATURE BY 1 DEGF. IF AFTER 30 MINUTES THE CHILLED WATER COIL RETURN TEMPERATURE REMAINS BELOW 50 DEGF INCREASE PREHEAT COIL DISCHARGE AIR TEMPERATURE ANOTHER 1 DEGF. MAXIMUM PREHEAT COIL DAT SETPOINT SHALL BE 46 DEGF (ADJUSTABLE).

HUMIDIFIER CONTROL: USE EXISTING HUMIDITY SENSORS IN THE AREAS SERVED BY AHU-1 TO INITIATE AND CONTROL THE HUMIDIFIER. IF THE AVERAGE HUMIDITY OF THE EXISTING SENSORS SERVING THE AHU-1 AREA IS LESS THAN 30% (ADJUSTABLE) INITIATE HUMIDIFICATION TO CONTROL AVERAGE HUMIDITY TO 30% (ADJUSTABLE). The DDC SYSTEM SHALL OVERRIDE THE SIGNAL TO THE HUMIDIFIER CONTROL VALVE TO LIMIT THE SUPPLY AIR RELATIVE HUMIDITY TO A MAXIMUM OF 70% (ADJUSTABLE). IF THE SUPPLY OR RELATIVE HUMIDITY EXCEEDS 75% (ADJUSTABLE) AN ALARM SHALL BE SENT TO THE OPERATOR INTERFACE. WHENEVER THE OUTDOOR AIR BULB REFERENCE TEMPERATURE IS ABOVE 40 DEGREESF (ADJUSTABLE) THE DDC SYSTEM SHALL CLOSE THE HUMIDIFIER CONTROL VALVE AND DISABLE ANY ALARMS.

VENTILATION AIR CONTROL:

AIRFLOW STATION: AIR INLET PROBES ON SUPPLY FANS SHALL BE USED TO MONITOR SYSTEM AIRFLOW. PROVIDE COMBINED AIRFLOW VALUE TO DDC FROM ALL FAN MONITORS.

UV LIGHTS: THE UV LIGHTS SHALL BE ENABLED WHENEVER THE AIR HANDLING UNIT IS ENABLED AND RUN CONTINUOUSLY. MONITOR RUN-HOURS AND PROVIDE MAINTENANCE ALARMS AT INTERVALS RECOMMENDED BY THE MANUFACTURER. UV LIGHTS SHALL BE HARDWIRED TO THE AIR HANDLING UNIT DOOR SWITCH. IN THE EVENT THE DOOR OPENS, THE LIGHTS SHALL BE DISABLED.

UNIT SHUTDOWN:

THE SUPPLY FANS SHALL STOP.

THE OUTSIDE AIR DAMPER SHALL CLOSE.

THE CHILLED WATER CONTROL VALVE(S) SHALL CLOSE.

THE HUMIDIFIER CONTROL VALVE SHALL CLOSE.

THE HEATING COIL CONTROL VALVE(S) SHALL CLOSE. FREEZESTAT SHALL OVERRIDE HEATING CONTROL VALVE(S) AS REQUIRED.

ALL FIRE/SMOKE AND SMOKE DAMPERS ASSOCIATED WITH THE AIR HANDLING SYSTEM SHALL CLOSE.

FILTER MONITORING:

FOR EACH FILTER BANK WITH RATING OF MERV 8 AND BELOW, PROVIDE AN ALARM TO THE OPERATOR INTERFACE WHEN THE DIFFERENTIAL STATIC PRESSURE EXCEEDS 0.6" W.C. (ADJUSTABLE).

FOR EACH FILTER BANK WITH RATING OF MERV 9 TO MERV 16, PROVIDE AN ALARM TO THE OPERATOR INTERFACE WHEN THE DIFFERENTIAL STATIC PRESSURE EXCEEDS 1.0" W.C. (ADJUSTABLE).

FOR EACH FILTER BANK WITH RATING OF MERV 17 AND ABOVE, PROVIDE AN ALARM TO THE OPERATOR INTERFACE WHEN THE DIFFERENTIAL STATIC PRESSURE EXCEEDS 2.0" W.C. (ADJUSTABLE).

ALARM MONITORING:

FREEZE PROTECTION: INSTALL AN ELECTRIC FREEZESTAT DOWNSTREAM OF THE HEATING COIL PER MANUFACTURER'S RECOMMENDATION. PROVIDE A STAGED FREEZE PROTECTION APPROACH AS INDICATED BELOW.

1. IF THE HEATING COIL DISCHARGE AIR TEMPERATURE DROPS BELOW 40°F (ADJUSTABLE) FOR 5 MINUTES, OVERRIDE THE OUTSIDE AIR DAMPER TO MAINTAIN THE MINIMUM OUTSIDE AIRFLOW AND MODULATE THE HEATING

COIL CONTROL VALVE TO MAINTAIN A HEATING COIL DISCHARGE AIR TEMPERATURE OF AT LEAST 55ºF (ADJUSTABLE). DISABLE THIS FUNCTION WHEN THE HEATING COIL DISCHARGE AIR TEMPERATURE RISES ABOVE 45ºF

(ADJUSTABLE) FOR 5 MINUTES.

2. IF THE HEATING COIL DISCHARGE AIR TEMPERATURE DROPS BELOW 38 DEGF ADJUSTABLE FOR 5 MINUTES, SEND AN ALARM TO THE BUILDING MANAGEMENT SYSTEM. IF DISCHARGE AIR TEMPERATURE DROPS BELOW 36 DEGF SHUT THE AIR HANDLING UNIT DOWN, CLOSE THE OUTSIDE AIR DAMPER AND SEND AN ALARM TO THE BUILDING MANAGEMENT SYSTEM.

3. IF THE FREEZESTAT SENSES A TEMPERATURE AT OR BELOW 32ºF (ADJUSTABLE), SHUT DOWN THE SUPPLY FANS, CLOSE THE OUTDOOR AIR DAMPER, OPEN THE COOLING COIL CONTROL VALVE TO 100%. MODULATE THE HEATING COIL CONTROL VALVE TO MAINTAIN A HEATING COIL DISCHARGE AIR TEMPERATURE OF 80ºF (ADJUSTABLE). THE FREEZESTAT SHALL SHUT DOWN THE UNIT INDEPENDENTLY OF THE DDC SYSTEM VIA RELAYS. A SECOND SET OF CONTACTS SHALL NOTIFY THE DDC SYSTEM THAT SHALL SEND AN ALARM TO THE OPERATOR INTERFACE (MANUAL RESET TYPE).

FIRE ALARM INTERFACE: WHEN SMOKE DETECTORS AT THE OUTSIDE AIR INLET AND UNIT DISCHARGE ARE INITIATED, THE UNIT SHALL SHUT DOWN AND THE ISOLATION SMOKE DAMPERS AT THE INLET AND OUTLET OF THE AIR HANDLING UNIT SHALL CLOSE. THE FIRE ALARM SYSTEM SHALL NOTIFY THE OPERATOR INTERFACE WHENEVER AN ALARM CONDITION IS EXPERIENCED AT THE UNIT OR IN AREAS SERVED BY THE UNIT.

WITH THE EXCEPTION OF HARDWIRED SAFETIES (FREEZESTAT, ISOLATION SMOKE DAMPERS, HIGH SUCTION AND HIGH DISCHARGE PRESSURES) ALL AIR HANDLING UNIT AND GLYCOL HEATING HOT WATER SETPOINTS TO BE ADJUSTABLE THROUGH THE GRAPHIC…