23106.037 2025 09 23 Mattawan BP1F - Addendum 01.pdf

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ADDENDUM NO. 1

DATE OF ISSUANCE: September 23, 2025

PROJECT: MCS – BID PACKAGE 1F: HIGH SCHOOL GYM COOLING

Western St.

Mattawan, MI 49071

OWNER: Mattawan Consolidated School

ARCHITECT’S PROJECT NO.: 23-106.037

ORIGINAL BID ISSUE DATE: August 11, 2025

SCOPE OF WORK

This Addendum includes changes to, or clarifications of, the original Bidding Documents and any previously issued addenda, and shall be included in the Bid. All of these Addendum items form a part of the Contract Documents. The Bidder shall acknowledge receipt of this Addendum in the appropriate space provided on the Bid Form. Failure to do so may result in disqualification of the Bid.

DOCUMENTS INCLUDED IN THIS ADDENDUM

This Addendum includes 1 pages of text and the following documents:

• Bidding Documents: None.

• Contract Conditions: None.

• Specification Sections: None.

• Drawings: M 501

CHANGES TO SPECIFICATIONS

NONE.

CHANGES TO DRAWINGS

ADD-1 Item No. D-1 - Coils

Refer to Sheet(s): M 501

Updated coil schedule and AHU sections to show split coils.

END OF ADDENDUM.

REFER TO THE TABLE

FOR UPSTREAM

DISTANCE

5 DIA

SHUT-OFF VALVE

ELECTROMAGNETIC

FLOW METER

10 DIA

OBSTRUCTION

PIPE SIZE REDUCTION / EXPANSION IN STRAIGHT RUN

UPSTREAM

MINIMUM UPSTREAM STRAIGHT RUN REQUIRED (1)

SINGLE BEND PRECEDED BY ≤ 9 DIAMETERS OF STRAIGHT PIPE RUN

OUTFLOWING TEE / PUMP OUTFLOW

SINGLE BEND PRECEDED BY ≥ 9 DIAMETERS OF STRAIGHT PIPE RUN

MULTIPLE BENDS OUT OF PLANE

INFLOWING TEE

VALVE

10 DIA

15 DIA

20 DIA

30 DIA

30 DIA

30 DIA

1. BASED ON "ONICON" MODEL F3500

• ACCEPTABLE TO INSTALL IN

VERTICAL PIPE.

• POSITION METER ANYWHERE IN

UPPER 240° FOR HORIZONTAL PIPE.

PRESSURE GAGE

IN

LI

N E

P U M

P

ECCENTRIC REDUCER

W/ LEVEL SIDE UP

CHECK VALVE

BALL VALVE

FLANGED CONNECTION

BALL VALVE

BALL VALVE

STRAINER, INSTALLED

PER MANUFACTURE'S

RECOMMENDATIONS

SECOND FLOOR

213' - 4"

THIRD FLOOR - MEZZANINE

228' - 1"

ROOF LOWER

116' - 0"

ROOF LOWER

116' - 0"

DC.5

TOM

118' - 0"

TOM

118' - 0"

SECOND FLOOR

113' - 4"

SECOND FLOOR

113' - 4"

ROOF LOWER

116' - 0"

ROOF LOWER

116' - 0"

DC.5

TOM

118' - 0"

TOM

118' - 0"

SECOND FLOOR

113' - 4"

SECOND FLOOR

113' - 4"

EXIST. AHU-4

CC-4.1

EXIST.

24"x60"

"x

EXIST. 40"ø

EXIST. HC

CC-4.2

SECOND FLOOR

213' - 4"

THIRD FLOOR - MEZZANINE

228' - 1"

ROOF LOWER

116' - 0"

ROOF LOWER

116' - 0"

DC.5

TOM

118' - 0"

TOM

118' - 0"

SECOND FLOOR

113' - 4"

SECOND FLOOR

113' - 4"

ROOF LOWER

116' - 0"

ROOF LOWER

116' - 0"

DC.5

TOM

118' - 0"

TOM

118' - 0"

SECOND FLOOR

113' - 4"

SECOND FLOOR

113' - 4"

EXIST. AHU-3

CC-3.1

EXIST.

30"x72"

"x

EXIST. 40"ø

EXIST. HC

CC-3.2

THERMOMETER

BALANCING VALVE

CHECK VALVE

STRAINER

PRESSURE GAUGE

C.P.

CWS

SHUT-OFF VALVE

CWR

CWS

CWR

REDUCER IF REQUIRED

ECCENTRIC TYPE W/ LEVEL

SIDE UP. TYPICAL FOR ALL

HYDRONIC HORIZONTAL

REDUCERS.

MANUAL AIR VENTS @

HIGH POINTS (TYP.)

CIRCULATING PUMP

(CONSTANT SPEED)

2-WAY CONTROL

VALVE

CWS

CWR

BRANCHES

TO AHU-4

BRANCHES

TO AHU-3

8" MAINS

COOLING COIL

COOLING COIL

THERMOMETER (TYP.)

UNIONS OR FLANGES (TYP.) OFFSET

PIPING TO ALLOW FOR EASY COIL

REMOVAL

HOSE BIBB DRAIN AT BOTTOM OF

HEADER (TYP.)

BALL VALVE AIR VENT OFF OF

COIL. TERMINATE OUTSIDE AHU

WITH 3/4" HOSE THREAD (TYP.)

PRESSURE

GAUGE

(TYP.)

T O

W E

R P

IN

K

S T

E R

.C O

M

A L L R

IG

H

T S

R E

S E

R V

E D

S H

E E

T T

IT

L

E

S H

E E

T N

U M

B E

R

O W

N E

R P

R O

J E

C T

T

IT

L E

D A

T E

M E

C H

A N

IC

A

L S

C H

E D

U L E

S A

N D

D E

T A

IL

S

-1

.1

M

A U

G U

S T

B

ID

P A

C K

A G

E

F

H

IG

H S

C H

O O

L G

Y M

C O

O L

IN

G

M A

T T

A W

A N

M

IC

H

IG

A N

M A

T T

A W

A N

C O

N S

O L

ID

A

T E

D S

C H

O O

L S

PUMPS BASED ON BELL & GOSSETT

MARK MODEL

FLOW

RATE

(GPM)

HEAD

(FT)

MOTOR DATA

SYSTEM LOCATION REMARKSHP BHP RPM VOLTAGE

P-12 e-90 167 20 3 1.32 2593 480 CC-1 MECHANICAL 2409 1, 2, 3

P-13 e-90 90 20 1 0 1607 480 CC-2 MECHANICAL 2409 1, 2, 3

COOLING COILS - CHILLED WATER (30% PROPYLENE GLYCOL) BASED ON TRANE

MARK SIZE (2) ROWS CFM

TMBH

(1)

SMBH

(1) E.D.B.

(°F) E.W.B.

(°F) L.D.B.

(°F) L.W.B.

(°F) GPM

A.P.D.

(IN WC)

W.P.D.

(FT)

FACE VELOCITY

(FPM) REMARKS

CC-3.1 32.5"x105" 2 26,040 838 716 80 65 55 54 167 0.57 7.84 530 EXISTING AHU-3

CC-3.2 32.5"x105" 2 26,040 838 716 80 65 55 54 167 0.57 7.84 530 EXISTING AHU-3

CC-4.1 20" X 102" 2 13,980 454 384 80 65 55 54 90 0.41 12.32 440 EXISTING AHU-4

CC-4.2 20" X 102" 2 13,980 454 384 80 65 55 54 90 0.41 12.32 440 EXISTING AHU-4

SCALE: NONE

FLOW METER INSTALLATION DETAIL

NOTES:

1. VFD PROVIDED BY TEMPERATURE CONTROLS CONTRACTOR.

2. WET ROTOR PUMP WITH INTEGRATED VARIABLE FREQUENCY DRIVE AND BMS COMMUNICATIONS. ALL AVAILABLE POINTS SHALL BE REVEALED TO THE BMS.

3. LEAD-FREE BRONZE CIRCULATOR

NOTES:

1. BASED ON 45°F EWT, 55°F LWT.

2. FIELD VERIFY COIL DIMENSIONS.

3. PROVIDE 2 DOUBLEWALL CONSTRUCTION THYBAR CW COIL MODULE TO MATCH EXISTING AHU WIDTH AND

HEIGHT. PROVIDE ACCESS MODULE WITH 15 ACCESS DOOR DOWNSTREAM OF COIL MODULE. CW COIL

AND ACCESS MODULE TO BE INSTALLED BETWEEN EXISTING FILTER MODULE AND HW COIL MODULE.

REWORK EXISTING MIXING BOX AS NEEDED TO ACCOMMODATE NEW COIL MODULES.

4. THYBAR TO PROVIDE (1) COIL MODULE, DOUBLE WALL POST AND PANEL CONSTRUCTION, GALVANIZED

STEEL, FIBERGLASS INSULATION THROUGHOUT. SS DRAIN PANS INCLUDED. (2) ACCESS DOORS

DOWNSTREAM OF THE COIL TO BE INCLUDED. DUAL COILS STACKED PROVIDED BY THYBAR. INCLUDE 6"

REMOVABLE BASE RAIL.

5. COIL CAPACITIES LISTED ARE TOTAL FOR THE AHU.

1/4" = 1'-0"

GYM MEZZANINE SECTION - AHU-4

1/4" = 1'-0"

GYM MEZZANINE SECTION - AHU-3

SCALE: NONE

PUMP - INLINE PIPING DETAIL

SCALE: NONE

AHU COOLING COIL PIPING DETAIL - SINGLE COIL 2-WAY VALVE

ISSUED FOR DATE

ADDENDUM 1 SEPTEMBER 23,

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