western connecticut state university ......md300 3 m301 1 m300 3 proposed path from accu-1 to hv-1....

Note: Please note receipt of all addenda on your bid form.

of 3

WESTERN CONNECTICUT STATE UNIVERSITY

ADDENDUM NO. 3 TO

GRASSO RESIDENCE HALL HVAC IMPROVEMENTS/UNIT REPLACEMENT BID NO. 2019-MRC-0014

DATE: APRIL 18, 2019

The following addendum will expand, amend, revise and clarify the specifications bearing the above title, dated February 22, 2019, and will become a part of them – not replace them. All information in the original contract documents still apply unless specifically omitted or revised by the addendum. Below is a list of RFI’s received, along with the subsequent responses submitted by Kohler Ronan LLC, the consultant-of-record for this project.

HV-1 Controls:

1.) DWG: M002 shows an existing duct mounted damper in the supply air. Our records do not show that this damper exists today. Can confirm if this damper is existing to be re-used?

KR Response: Damper does not exist. Refer to revised Flow and Control Diagram 2/M002.

2.) DWG: M002 shows an existing duct mounted damper in the supply air. Since this unit serves multiple floors, is it necessary to have a supply air damper at each floor? Does this damper need to be a smoke damper?

KR Response: Refer to revised Flow and Control Diagram 2/M002. Dampers are not required

3.) DWG: M002 shows new temperature, humidity and static pressure sensors on the Outdoor air. Are these sensors necessary for this system?

KR Response: Provide sensors as indicated on drawings.

4.) DWG: M002 shows new Air Flow Measuring Stations (F) in the supply air. Are these Air Flow Measuring Stations necessary for this system?


5.) DWG: M002 shows a new Outdoor Air-Cooled Condensing Unit. Is there an existing underground conduit dedicated for control wires today? If not, someone will need to provide trenching and conduit from building to Outdoor Air-Cooled Condensing Unit location for control wiring.

KR Response: There is no existing conduit. No trenching is required. Route control wiring/conduit along same path as electrical conduit and mechanical refrigerant piping to condensing unit. Coordinate with mechanical and electrical contractors.


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AC-1 Controls:

1.) DWG: M002 shows an existing duct mounted damper in the supply air. Our records do not show that this damper exists today. Can confirm if this damper is existing to be re-used?

KR Response: Flow and control diagram 1/M002 does not indicate a supply damper.

2.) DWG: M002 shows an existing duct mounted damper in return air. Our records do not show that this damper exists today. Can WCSU confirm if this damper is existing to be reused?

KR Response: Flow and control diagram 1/M002 does not indicate a return damper. The Existing outdoor air damper shall remain functioning.

3.) DWG: M002 shows new temperature, humidity and static pressure sensors on the Outdoor air. Are these sensors necessary for this system?


4.) DWG: M002 shows new Air Flow Measuring Stations (F) in both the return air and supply air. Are these Air Flow Measuring Stations necessary for this system?


5.) The existing controls for AC-1 utilizes return air CO2 control. Is this a requirement in the new design?

KR Response: All existing sequence of operations shall be maintained. Provide all sensors and integration as required.

CCC-1 – Cooling Tower Controls:

1.) DWG: M002 shows a new Cooling Tower located away from the building. Is there an existing underground conduit dedicated for control wires today? If not, someone will need to provide trenching and conduit from building to Cooling Tower location for control wiring.

KR Response: Our current understanding is there is an existing underground conduit for control wiring, which shall be re-used.

2.) DWG: M002 shows a new VFD associated with the cooling tower. Where will this VFD be located? Is there an existing underground conduit dedicated for control wires today? If not, someone will need to provide trenching and conduit from building to Cooling Tower location for control wiring.

KR Response: See response above regarding conduit. Refer to 3/M301 for VFD-1 location.


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List of “Drawings Addendum #1” Plans as part of this addendum:

E-301 Condensing Unit Plan – Electrical

M-002 Flow and Control Diagrams – Mechanical

M-003 First Floor Key Plan – Mechanical

M-600 Details – Mechanical

M-603 Details – Mechanical

MD-301 Cooling Tower Demolition Plan - Mechanical

END OF ADDENDUM

MAIN SERVICESWITCHBOARD (ETR)

CORE DRILLTHROUGH EXISTINGBUILDING WALL

FOLLOWMECHANICAL PIPINGROUTE UNTIL THISPOINT AND BRANCHOFF

CORE DRILLTHROUGH EXISTINGBUILDING WALL

1

2

ACCU-1

ROUTE CONDUITTIGHT TO CEILING

GFI

WP

EXISTINGPANELBOARD (ETR)

PULLBOX

3

MAIN ELECTRICROOM

ROUTE ALONG WITH ACCU-1FEEDER TO MAIN ELECTRICROOM

CONDUIT SHALL BE CONCEALED AND LOCATED ABOVE FINISHED CEILING. ROUTECONDUIT ALONGSIDE NEW MECHANICAL REFRIGERATION PIPING.

PATCH CEILING TO MATCH EXISTING CONDITIONS.

PROVIDE 3#12+G IN 3/4"C FROM EXISTING PANELBOARD LOCATED IN EXISTINGELECTRICAL ROOM. CONNECT TO SPARE 20A-1P CIRCUIT BREAKER

ELECTRICAL KEY NOTES

1

2

3

1

DATE

22-Feb-2019

WCSU

Planning and Engineering

181 White Street

Danbury, CT 06810

www.wcsu.edu

FA

CIL

IT

IE

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WC

SU

93 Lake Avenue, Danbury, CT 06810

203.778.1017 F 203.778.1018

171 Madison Avenue,

New York, NY 10016

212.695.2422 F 212.695.2423

www.kohlerronan.com

E-mail [email protected]

No. Date Revision

Scale: 1/4"=1'-0"CONDENSING UNIT PLAN

E3011

SHEET #

E301

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VFD SPEED CONTROL

VFD ENABLE

VFD SPEED FEEDBACK

VFD STATUSDI

DO

AO

AI

VARIABLE

FREQUENCY

DRIVE

BACNET INTERFACE

M002

4

NOT TO SCALE

VARIABLE FREQUENCY DRIVE CONTROL DIAGRAM

VFD

P

MECHANICAL CONTROLS SYMBOL LIST

DI

AI

AO

DO

T

A

M

F

VS

* ALL SYMBOLS MAY NOT BE USED IN THESE DOCUMENTS.

L

ALARM

DDC ANALOG INPUT POINT

DDC ANALOG OUTPUT POINT

CURRENT SENSOR

DDC DIGITAL INPUT POINT

DDC DIGITAL OUTPUT POINT

FLOW MEASURING STATION

HUMIDITY SENSOR

ELECTRONIC LIQUID LEVEL SENSOR

DAMPER/VALVE MOTOR

PRESSURE SENSOR

TEMPERATURE SENSOR

VARIABLE FREQUENCY CONTROLLER

MAGNAHELIC PRESSURE GAUGE

COIL

OPPOSED BLADE DAMPER

PUMP / FAN

M002

2

NOT TO SCALE

HV-1 CONTROL DIAGRAM

M002

1

NOT TO SCALE

AC-1 CONTROL DIAGRAM

M002

3

NOT TO SCALE

CCC-1 CONTROL DIAGRAM

CS

RETURN AIR

OUTSIDE AIR

M

AI

P

ME

RV

-13 F

ILT

ER

A

DX

COIL

DO

CWS

CWR

AI

P

ME

RV

-13 F

ILT

ER

A

SUPPLY

FAN

CS

SUPPLY AIR

DUCT

MOUNTED

DAMPER

ME

RV

-8 F

ILT

ER

OUTSIDE AIR

HEATING

COIL

AO

HWS

HWR

SUPPLY FAN

DX

COOLING

COIL

TO OUTDOOR AIR-COOLED

CONDENSING UNIT

SUPPLY AIR

SUCTION

LIQUID

CS

SPRAY

PUMP

4" CWR

4" CWS

MAKEUP

WATER

VIBRATION SWITCHVB

MS MOTOR STARTER

SD

SMOKE DETECTOR; FURNISHED AND WIRED BY

DIVISION 26 CONTRACTOR AND MOUNTED BY DIVISION

23 CONTRACTOR

STATIC PRESSURE SENSOR

SP

T

A

AI

SP

AI

H

AI

MS

AI

T

AI

H

AI

F

AI

CS

VS

AI

A

AI

SP

AI

SP

HARDWIRED CONNECTION

SD

NOTE: LIMIT HARD WIRED

T

AI

H

AI

F

AI

A

AI

SP

AI

SPSD T

A

AI

SP

AI

H

AI

DI

VB

MS

DI

AO

L

SU

CT

IO

N

LIQ

UID

VFD

CS

AI

H

CS

VS

DI

P-1

1

CO

2

1

1

DATE

22-Feb-2019

WCSU


181 White Street

Danbury, CT 06810

www.wcsu.edu

FA

CIL

IT

IE

S

WC

SU


203.778.1017 F 203.778.1018

171 Madison Avenue,

New York, NY 10016

212.695.2422 F 212.695.2423

www.kohlerronan.com


No. Date Revision

SHEET #

M002

FL

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C

ON

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04.15.2019 Addendum #1

AutoCAD SHX Text

~

AutoCAD SHX Text

~

AutoCAD SHX Text

~

AutoCAD SHX Text

~

AutoCAD SHX Text

~

AutoCAD SHX Text

~

MD300

3

M301

1

M300

3

PROPOSED PATH FROM ACCU-1 TO HV-1. ALL PIPING

RUNNING THROUGH FINISHED SPACES SHALL BE

CONCEALED AND ABOVE FINISHED CEILINGS.

MD301

2

M301

3

REFRIGERANT PIPING IS SHOWN DIAGRAMMATICALLY ONLY.

CONTRACTOR SHALL BE RESPONSIBLE FOR SIZING AND

ROUTING PIPING PER MANUFACTURER'S REQUIREMENTS.

1

DATE

22-Feb-2019

WCSU


181 White Street

Danbury, CT 06810

www.wcsu.edu

FA

CIL

IT

IE

S

WC

SU


203.778.1017 F 203.778.1018

171 Madison Avenue,

New York, NY 10016

212.695.2422 F 212.695.2423

www.kohlerronan.com


No. Date Revision

SHEET #

M003

FIR

ST

F

LO

OR

K

EY

P

LA

N - M

EC

HA

NIC

AL

Scale: 1/32"=1'-0"

FIRST FLOOR KEY PLAN

M003

1

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04.15.2019 Addendum #1

AutoCAD SHX Text

UP

1. REFER TO PLANS FOR ORIENTATION OF PIPING CONNECTIONS.

NOTES:

UNION/FLANGE.

TYPICAL FOR ALL

CONNECTIONS.

BALANCING

VALVE.

4" CWR

1-1/4" MAKE-UP

WATER.

MAKE-UP WATER

VALVE

3" OVERFLOW

4" CWS

2" DRAIN

BUTTERFLY VALVE.

TYPICAL.

HOUSEKEEPING PAD

AT GRADE.

NEOPRENE PAD.

INSTALLATION NOTES FOR COOLING TOWERS

1. RIG UNIT INTO PLACE BY REFERRING TO MANUFACTURER'S RIGGING

INSTRUCTIONS.

2. SET UNIT DEAD LEVEL IN BOTH DIRECTIONS.

3. SUPPORT PIPE SO NO WEIGHT RESTS ON UNIT.

4. THOROUGHLY CLEAN UNIT BEFORE FILLING SYSTEM.

5. BALANCE CONDENSER WATER FLOW.

6. ADJUST BLEED VALVE FOR PROPER AMOUNT OF WATER TO BE

WASTED, AS RECOMMENDED BY WATER TREATMENT CONTRACTOR.

7. GREASE OR OIL ALL BEARINGS IN ACCORDANCE WITH THE

MANUFACTURER'S RECOMMENDATIONS.

8. PROVIDE VALVED CONNECTION IN SUPPLY, OUTLET OR MAKE-UP

PIPE AS RECOMMENDED BY WATER TREATMENT CONTRACTOR.

9. COORDINATE PURCHASED COOLING TOWERS WITH COOLING TOWER

SUPPORTS, LOCATION OF PIPING, ETC.

*

*

DOUBLE WALL

VANES

ONLY ACCEPTABLE WERE SPACE DOES

NOT PERMIT THE USE OF RADIUS ELBOWS

AIR FLOW

SUPPLY TAP

AIR FLOW

TAKE-OFF TO EXPOSED

SIDEWALL REGISTER

ACOUSTICALLY

LINED DUCT

DIMENSION DENOTES

CLEAR OPENING

12X8

RADIUS ELBOW

W

W

AIR FLOW

RETURN TAP

AIR FLOW

W

SUPPLY SPLIT

20°

MAX

TRANSITION

NOTE:

SPECIFICATIONS EXCEED SMACNA STANDARDS IN SOME

INSTANCES. SMACNA SHALL BE CONSIDERED THE

MINIMUM STANDARD UNLESS OTHERWISE NOTED ON THE

DRAWINGS, DETAILS OR IN THE SPECIFICATIONS.

SQUARE ELBOW

DUCT TAP TO EXPOSED

SIDEWALL REGISTER ONLY

BRANCH

DUCT

VOLUME EXTRACTOR WITH

MANUAL ADJUSTING LEVER.

R = W OR

12" MAX

R=W

R=W

R = W OR

12" MAX

BRANCH DUCT

STRUCTURAL FRAMING

BY THIS DIVISION.

W

W

2'-0"

8"

1'-4"

1'-0"

10"

10"

6"

1

2

NOTE:

1. CONCRETE PAD LENGTH, WIDTH AND LOCATION TO BE DETERMINED BY THE

MECHANICAL CONTRACTOR BASED ON THE SUBMITTED EQUIPMENT.

1"

45° CHAMFER

CAST-IN-PLACE CONCRETE PAD W/ 28-DAY COMPRESSIVE STRENGTH OF

4500 PSI, W/C RATIO OF +/- 0.48, 2" TO 4" SLUMP AND 4% TO 7% AIR

CONTENT. PROVIDE 1/4 PER FOOT DRAINAGE SLOPE IN SHORT DIRECTION.

#4 @ 12" O.C. (UPPER LAYER LONG-WAY,

LOWER LAYER SHORT-WAY)



#4 CONT., BOTT.

CRUSHED STONE

UNDISTURBED SOIL OR COMPACTED FILL

M600

4

NOT TO SCALE

COOLING TOWER, CCC-1, HOUSEKEEPING PAD AT GRADE

M600

2

NOT TO SCALE

DUCT CONSTRUCTION

M600

1

NOT TO SCALE

COOLING TOWER

M600

3

NOT TO SCALE

HOUSEKEEPING PAD

NOTE:



MINIMUM 3000 PSI REINFORCED

CONCRETE FORMED PAD.

45° CHAMFER

#4 BARS EACH WAY, PROVIDE

HOOK, 90-DEG, AT ENDS. TYPICAL.

1" CLEAR ALL AROUND

EXISTING FINISHED FLOOR #4 DOWEL ANCHOR EMBEDDED 4' AND LOCATED

18" O.C. AROUND PERIMETER. FASTEN DOWEL TO

CONCRETE WITH HILTI RE500 ADHESIVE

ANCHORING SYSTEM OR APPROVED EQUAL

CHIP OR ROUGH UP EXISTING FLOOR SLAB

WITHIN HOUSEKEEPING PAD FORM WORK

AND APPLY LATEX BONDING AGENT ON

ROUGHED UP CONC. ONLY

1"

4"

12" MIN.

2" MINIMUM

1/2"Ø THREADED DOWEL, 12"O.C.

ALL AROUND PERIMETER

MIN. 4" TO EDGE OF EQUIPMENT

FRAME AROUND PERIMETER.

5" CW SPRAY

PUMP LINE.

1

DATE

22-Feb-2019

WCSU


181 White Street

Danbury, CT 06810

www.wcsu.edu

FA

CIL

IT

IE

S

WC

SU


203.778.1017 F 203.778.1018

171 Madison Avenue,

New York, NY 10016

212.695.2422 F 212.695.2423

www.kohlerronan.com


No. Date Revision

SHEET #

M600

DE

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04.15.2019 Addendum #1

M603

1

NOT TO SCALE

HV-1 HOT WATER COIL CONFIGURATION

HWR

HWS

2"

HV-1

CONNECTIONS

A

UNIT NUMBER

AIR VENT

TYPICAL

HOSE END WITH BALL

VALVE. TYPICAL

1/2"

BUTTERFLY OR BALL

VALVE. TYPICAL

PRESSURE

GAUGE

THERMOMETER

TYPICAL

COMBINATION BALANCING/FLOW

MEASURING DEVICE. TYPICAL

THREE WAY CONTROL VALVE

A

NOTE:

TABULATED DATA FROM SMACNA ALLOWS FOR DUCT REINFORCING

AND INSULATION, BUT NO EXTERNAL LOAD.

QUANTITY / SIZE

IN. (MM)

MAX. DUCT DIA.

IN. (MM)

MAX. LOAD

LBS. (KG)

MAX.

SPACING

FT. (M)

BAND

HANGER

RODS

INSULATION OR LINING. PROVIDE

INSULATION SHIELD AT EVERY

HANGER UNLESS LINING IS USED.

TYPICAL.

LOAD RATED FASTENERS

BAND OF SAME SIZE AS HANGER STRAP

INSULATION OR LINING. PROVIDE

INSULATION SHIELD AT EVERY HANGER

UNLESS LINING IS USED. TYPICAL

12 (650)

36 (900)

50 (1250)

60 (1500)

84 (2100)

ONE 1 (25) x 22 GA STRAP

TWO 3/8 (10) DIA RODS




260 (119)

420 (190)

700 (317)

1320 (598)

2500 (1133)

10 (3.05)

10 (3.05)

10 (3.05)

10 (3.05)

10 (3.05)

M603

3

NOT TO SCALE

ROUND DUCTWORK HANGER DETAIL

HANGER STRAPS OR RODS

13" DIAMETER OR LARGER

12" DIAMETER OR LESS

ECCENTRIC PIPE REDUCER.

TYPICAL.

UNION. TYPICAL.

INLINE PUMP

STRAINER WITH HOSE END

AND BALL VALVE

**2'-0"

**8"

1'-4"

1'-0"

10"

10"

6"

1

2

NOTE:



1"

45° CHAMFER

CAST-IN-PLACE CONCRETE PAD W/ 28-DAY COMPRESSIVE STRENGTH OF

4500 PSI, W/C RATIO OF +/- 0.48, 2" TO 4" SLUMP AND 4% TO 7% AIR

CONTENT. PROVIDE 1/4 PER FOOT DRAINAGE SLOPE IN SHORT DIRECTION.





#4 CONT., BOTT.

CRUSHED STONE

UNDISTURBED SOIL OR COMPACTED FILL

M603

2

NOT TO SCALE

CONDENSING UNIT, ACCU-1, HOUSEKEEPING PAD AT GRADE

1

1

** INDICATED

HEIGHTS SHALL

VARY WITH OR

DEPEND ON SLOPE

OF EXISTING GRADE.

DATE

22-Feb-2019

WCSU


181 White Street

Danbury, CT 06810

www.wcsu.edu

FA

CIL

IT

IE

S

WC

SU


203.778.1017 F 203.778.1018

171 Madison Avenue,

New York, NY 10016

212.695.2422 F 212.695.2423

www.kohlerronan.com


No. Date Revision

SHEET #

M603

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04.15.2019 Addendum #1

XXXXXXXXXXXXXXXXXXXXXXX

XX

XX

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X X X X X X X X X X X X X X X X X X X X X X X

XX

XX

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XX

XX

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XX

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XX

X

XXXXXXXXXXXXXXXXXXXXXXX

XX

XX

XX

XX

XX

XX

XX

X

X X X X X X X X X X X X X X X X X X X X X X X

5" CWS

5" CWR

X

X

X

XX

X X

4" CWR

X

X

XX

X

XX

X

XX

X X

XX

XX

XX

X X

XX

XX

XX

X

X

4" CWS

X

X

XX

X

XX

X

X

X

XX

X X

X

XX

X X

UNDERGROUND 5" CWS/R PIPING

TO AND FROM COOLING TOWER

AND MER TO REMAIN.

CCC-1

DRAIN DOWN TOWER AND DISCONNECT

POWER. REMOVE EXISTING COOLING

TOWER CCC-1 IN ITS ENTIRETY.

X

X

X

X

X

X

X

X

X

X

EXISTING FENCED ENCLOSURE.

REMOVE ALL ABOVE GROUND

CWS/R PIPING TO COOLING

TOWER. DISCONNECT AT CPVC

TRANSITION.

REMOVE INDICATED PORTION

OF DRAIN AND 3" BLOWDOWN

LINE AND DRAIN.

REMOVE ABOVE GROUND

PORTION OF 1" MAKEUP

WATER LINE.

REMOVE 4" SPRAY PUMP PIPING

AND SPAY PUMP IN ITS ENTIRETY.

MD

301

1

EXISTING HOUSEKEEPING

PAD TO BE DEMOLISHED IN

ITS ENTIRETY.

1

XX

XX

XX

XX

XX

XX

X X

XXXXXXXXXXXX

XX

XX

XX

XX

X

X X X X X X X X X X X X

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X X X X X X X X X X

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XXXXX

X

X

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X X

XXX

X

X

X

X X X X X

XXXXX

X

X X

XXX

X

XX

XX

X

XX

XX

XX

XX

X

XX

XX

XX

X

XX

X

1" C

WS

X

REMOVE EXISTING 1"

CONDENSER MAKEUP WATER

LINE AT GROUND PENETRATION.

REMOVE THE ENTIRETY OF

EXISTING 4" SPRAY PUMP LINE.

X

X

X

X

X

REMOVE EXISTING 3" BLOWDOWN.

REMOVE EXISTING

DRAINAGE PIPING BACK

TO INDICATED LOCATION.

EXISTING UNDERGROUND 1" CW

MAKEUP LINE TO MER TO REMAIN.

EXISTING UNDERGROUND CPVC

5" CWS/R TO MER TO REMAIN.

4" C

WR

CCC-1

5" C

WR

5" C

WS

REMOVE THE ENTIRETY OF

EXISTING 4" & 5" CWS/R PIPING.

REMOVED BACK TO CPVC

TRANSITION.

DRAIN DOWN, DISCONNECT

POWER SUPPLY AND REMOVE

EXISTING CCC-1 IN ITS ENTIRETY.

DATE

22-Feb-2019

WCSU


181 White Street

Danbury, CT 06810

www.wcsu.edu

FA

CIL

IT

IE

S

WC

SU


203.778.1017 F 203.778.1018

171 Madison Avenue,

New York, NY 10016

212.695.2422 F 212.695.2423

www.kohlerronan.com


No. Date Revision

SHEET #

MD301

CO

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Scale: 1/4"=1'-0"

COOLING TOWER - DEMOLITION

MD301

2

Scale: 1/4"=1'-0"

COOLING TOWER ELEVATION - DEMOLITION

MD301

1

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04.15.2019 Addendum #1

western connecticut state university ......md300 3 m301 1 m300 3 proposed path from accu-1 to hv-1....

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