attachment-5-bid-2935-25.pdf

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7777 10101010

PROVIDE

3" HWR

4" HWS

4" HWR (E)

3/4" HWS (E)

3/4" HWR (E)

4" HWS (E)

4" HWS (E)

2" HWS (E)

3" HWS (E)

3" HWR (E)

4" HWR (E)

PROVIDE

3" HWS

2" HWS (E)

53 REGIONAL DRIVE

CONCORD, NEW HAMPSHIRE 03301

TEL (603) 225-2978

FAX (603) 225-0095

www.mjinc.com

PLACE STAMP HERE SHEET:

DESCRIPTION

REVISIONS

No DATE

OF

JOHN O. MORTON BUILDING

7 HAZEN DRIVE BOX 483 ROOM 250

CONCORD, NEW HAMPSHIRE 03302-0483

(603) 271-3516 FAX(603) 271-3515

DRAWN BY: SCALE: DATE:ENGINEER/ARCHITECT: DESIGNED BY: APPROVED BY: CHECKED BY:

MCFARLAND JOHNSON

STATE OF NEW HAMPSHIRE

DEPARTMENT OF ADMINISTRATIVE SERVICES

DIVISION OF PUBLIC WORKS DESIGN & CONSTRUCTION

McFarland Johnson

PROJECT No:

CONTRACT:

MJ Project No: 1/4" = 1'-0"DEN PP PP PP 02/06/2024

81309

B

New Hampshire Correctional Facility for Women (NHCFW) Boiler

Heating System Repairs

42 Perimeter Rd, Concord, NH 03301

NH DEPARTMENT OF CORRECTIONS

M-300

ENLARGED MECHANICAL ROOM PLAN

3 418888.14

SCALE: 1/4" = 1'-0"1 ENLARGED MECHANICAL EQUIPMENT ROOM PLAN

KEYED NOTES

DEMO EXISTING 4" HWS LINE AS NECESSARY AND PROVIDE A 4x4x3 TEE.

DEMO EXISTING 4" HWR LINE AS NECESSARY AND PROVIDE A 4x4x3 TEE.

DEMO EXISTING 3" HWS LINE AS NECESSARY AND PROVIDE A 3x3x3 TEE.

DEMO EXISTING 3" HWR LINE AS NECESSARY AND PROVIDE A 3x3x3 TEE.

PROVIDE 3" BALANCING VALVE AND BALANCE TO 144 GPM.

PROVIDE 3" SHUTOFF VALVE (N.C.)

SCOPE OF WORK

1. EMERGENCY DOMESTIC HOT WATER (DHW) HEATING OPERATION:

A. PROVIDE A 3" HWS AND A 3" HWR LINE FROM THE EXISTING BUILDING HOT WATER HEATING

LOOP TO THE EXISTING DOMESTIC WATER HEATING LOOP.

B. PROVIDE 3" ISOLATION VALVES THAT WILL BE MANUALLY OPERATED IN THE EVENT OF AN

EMERGENCY.

C. PROVIDE BALNCING VALVE ON THE 3" HWR LINE.

D. MODIFY DDC CONTROLS AS NOTED IN THE REVISED SEQUENCE OF OPERATION ON M-500.

2. SCOPE ITEM DELETED VIA ADDENDUM.

3. SCOPE ITEM DELETED VIA ADDENDUM.

1 Addendum 2 07/24/2024

B

B

P

HC

P

1A

P

1B

AS

ET

P

2A

P

2B

TO EXISTING BUILDING LOADS

FROM EXISTING BUILDING LOADS

2" HWR (E)

HX

F R

O M

E X

IS

T

IN

G

D H

W

R E

C

IR

C L

O O

P

T O

E X

IS

T

IN

G

D

C

IR

C L

O O

P

VFD

VFD

VFD

VFD

3" HWR (E)

PS

3" HWS

3" HWR

DHW

SHUT OFF

VALVE N.C.

(TYP)

3" HWS (E)

P-2A GPM: 155 P-2B GPM: 155

P-1B GPM: 300

P-1A GPM: 300

B-1 MBH:

IN: 2702 @ 30 PSI

OUT: 2508

B-2 MBH:

IN: 2702 @ 30 PSI

OUT: 2508

4" HWR (E)

4" HWS (E)

3" HWS (E)3" HWR (E)

4" HWR (E)

3" HWS (E)

3" HWR (E)

1"

4" HWS (E)

4" HWS (E)

4" HWS (E)

DWH-1 MBH:

IN: 3373

BALANCING

VALVE

BALANCE

AT 144 GPM

4" HWR (E)4" HWS (E)

2" HWS (E) 2" HWR (E)

HX

F R

O M

E X

IS

T

IN

G

D

C

IR

C L

O O

P

T O

E X

IS

T

IN

G

D

C

IR

C L

O O

P

2" HWS (E)

RP

RP-4 GPM: 144RP

RP-3 GPM: 144

WATER METER DELETED

VIA ADDENDUM

53 REGIONAL DRIVE

CONCORD, NEW HAMPSHIRE 03301

TEL (603) 225-2978

FAX (603) 225-0095

www.mjinc.com

PLACE STAMP HERE SHEET:

DESCRIPTION

REVISIONS

No DATE

OF

JOHN O. MORTON BUILDING

7 HAZEN DRIVE BOX 483 ROOM 250

CONCORD, NEW HAMPSHIRE 03302-0483

(603) 271-3516 FAX(603) 271-3515

DRAWN BY: SCALE: DATE:ENGINEER/ARCHITECT: DESIGNED BY: APPROVED BY: CHECKED BY:

MCFARLAND JOHNSON

STATE OF NEW HAMPSHIRE

DEPARTMENT OF ADMINISTRATIVE SERVICES

DIVISION OF PUBLIC WORKS DESIGN & CONSTRUCTION

McFarland Johnson

PROJECT No:

CONTRACT:

MJ Project No: NOT TO SCALEDEN PP PP PP 02/06/2024

81309

B

New Hampshire Correctional Facility for Women (NHCFW) Boiler

Heating System Repairs

42 Perimeter Rd, Concord, NH 03301

NH DEPARTMENT OF CORRECTIONS

M-500

HVAC SCHEMATIC

4 418888.14

SCALE: NOT TO SCALE1 HEATING SYSTEM SCHEMATIC

EXISTING HEATING SEQUENCE OF OPERATION (FOR REFERENCE):EXISTING HEATING SEQUENCE OF OPERATION (FOR REFERENCE):EXISTING HEATING SEQUENCE OF OPERATION (FOR REFERENCE):EXISTING HEATING SEQUENCE OF OPERATION (FOR REFERENCE):

A. GENERAL

1. THE EXISTING BOILER HOT WATER CONTROL SYSTEM COORDINATES THE OPERATION OF TWO FULLY MODULATING HOT WATER BOILERS

AND THEIR ASSOCIATED BOILER PRIMARY CIRCULATING PUMPS IN ORDER TO MAINTAIN HOT WATER SUPPLY (HWS) TEMPERATURE AT

SETPOINT.

2. THE BUILDING MANAGEMENT SYSTEM (BMS) CONTROLS THE SECONDARY PUMPS, PROVIDES PLANT ENABLE/DISABLE CONTROL, HWS

TEMPERATURE SETPOINT, AND OA RESET CONTROL OUTPUTS TO THE BOILER PLANT CONTROLLER. THE BMS MONITORS BOILER OPERATION

AND DISPLAYS BOILER STATUS AT THE USER'S WORKSTATION.

B. APPLICATION

1. BOILER BURNER CONTROL: WITH THE BOILER CONTROL SYSTEM BMS INTERFACE SET TO ACTIVE, THE MODULATION OF THE BOILER IS

CONTROLLED THROUGH A 0-10V OR 4-20 MA DC (AS REQUIRED BY THE BOILER) BMS INPUT. THE BMS MONITORS THE HWS SYSTEM

TEMPERATURE AND COMPARES IT TO THE ACTIVE SETPOINT TO ESTABLISH A TARGET BOILER FIRING RATE. IF AN INDIVIDUAL BOILER

OUTLET TEMPERATURE EXCEEDS A PRE-SET MAXIMUM SETPOINT, THAT BOILER'S FIRING RATE SHALL BE AUTOMATICALLY CUT BACK BY A PID

LOOP TO PREVENT A HIGH TEMPERATURE TRIP. MODULATION SIGNALS ARE ELECTRICALLY ISOLATED CHANNEL-CHANNEL AND CHANNEL-

GROUND.

2. HOT WATER SUPPLY (HWS) TEMPERATURE SETPOINT: WHEN THE BOILER CONTROL SYSTEM BMS INTERFACE IS SET TO (ACTIVE), THE BMS

CALCULATES AN OUTSIDE AIR TEMPERATURE RESET SETPOINT. WHEN IN (INACTIVE) MODE THE OPERATOR MAY SET THE HWS

TEMPERATURE VIA THE FRONT PANEL DISPLAY.

3. TEMPERATURE RESET SCHEDULE:

a. HWS=140 DEG. F AT 0 DEG. F OUTSIDE AIR TEMPERATURE.

b. HWS=110 DEG F AT 60 DEG. F OUTSIDE AIR TEMPERATURE.

C. BOILER SEQUENCE:

1. THE BOILER CONTROL SYSTEM INCORPORATES A (LEAD/LAG) CASCADE CONTROL SCHEME FOR OPERATION. THE CONTROLLER UTILIZES

BOTH HWS TEMPERATURE, AS SENSED AT TS-1, AND BOILER FIRING RATE PERCENT TO START AND STOP THE BOILERS AND MINIMIZE THE

TOTAL NUMBER OF BOILERS IN OPERATION. THE CONTROLLER STARTS AND STOPS BOILERS WHEN THE HWS TEMPERATURE IS OUTSIDE THE

ADJUSTABLE TEMPERATURE LIMIT FOR LONGER THAN THE ADJUSTABLE TIME DELAY.

2. IN ORDER TO MINIMIZE HEADER TEMPERATURE DEVIATIONS THE CONTROL SYSTEM STARTS AND STOPS THE NEXT BOILER WHEN THE "LEAD"

BOILER IS AT AN ADJUSTABLE FIRING RATE LIMIT FOR LONGER THAN THE ADJUSTABLE TIME DELAY. THE CONTROL SYSTEM MONITORS BOTH

BOILER LOCKOUT AND LIMIT CIRCUITS TO AUTOMATICALLY SKIP OVER BOILERS THAT ARE POWERED DOWN FOR MAINTENANCE, TRIPPED OR

OTHERWISE WILL NOT START.

3. THE LEAD BOILER EITHER AUTOMATICALLY ROTATES EVERY 7 DAYS OR IS MANUALLY SELECTED BY THE OPERATOR.

4. THE BOILER RUNS AT LOW FIRE FOR WARM-UP FOR A PRESET LOW FIRE HOLD TIME. THE CONTROL SYSTEM REDUCES THE FIRING RATE TO A

MINIMUM BEFORE STOPPING A BOILER TO PREVENT ACCUMULATION OF FUEL IN THE FURNACE.

D. BOILER PRIMARY PUMP SEQUENCE: (P-2A, P-2B):

1. THE BOILER CONTROL SYSTEM INCLUDES INDEPENDENTLY OPERATED PRIMARY WATER PUMP CONTROL. ON A CALL FOR HEAT, THE BOILER

CONTROL SYSTEM CONFIRMS GAS PRESSURE AT GAS HIGH AND LOW PRESSURE SWITCHES, AND SENDS A SIGNAL TO THE ASSOCIATED

CIRCULATING PUMP TO START. FLOW IS PROVEN AT THE FLOW SWITCH PRIOR TO BOILER FIRING. PRIMARY PUMPS SHALL OPERATE

WHENEVER THE ASSOCIATED BOILER IS FIRING.

2. PUMP SPEED IS MODULATED FROM A 0-10V SYSTEM OUTPUT TO MAINTAIN A MIMINUM TEMPERATURE DIFFERENCE ACROSS THE HEAT

EXCHANGER. THE SYSTEM MUST KEEP AT LEAST ONE PUMP RUNNING TO ENSURE WATER IS ALWAYS MOVING PAST THE HEADER

TEMPERATURE SENSOR. THERE ARE AVAILABLE SEQUENCES TO WARM UP COLD BOILERS, AND ADJUSTABLE COOL DOWN PERIOD AFTER THE

BOILER HAS STOPPED. THE PUMP STOPS IMMEDIATELY IF ANY TRIPS OCCUR DURING PRE-PURGE, PILOT, OR MAIN FLAME TRIAL FOR

IGNITION.

E. SECONDARY PUMP CONTROL (P-1A & 1B)

1. THE LEAD SECONDARY CIRCULATING PUMP RUNS CONTINUOUSLY WHEN THE HEATING PLANT IS ENABLED. A REMOTE DIFFERENTIAL

PRESSURE TRANSMITTER IS CONNECTED TO THE SUPPLY AND RETURN LINES. PUMP VFD MODULATES AS REQUIRED TO MAINTAIN SYSTEM

DIFFERENTIAL PRESSURE AS 2-WAY VALVES OPEN AND CLOSE.

2. IF THE LEAD PUMP CANNOT MAINTAIN SECONDARY SYSTEM PRESSURE DIFFERENTIAL, IT MODULATES OFF AND BOTH THE LEAD AND LAG

PUMPS MODULATE ON SIMULTANEOUSLY TO MAINTAIN SYSTEM DP.

3. IF BOTH PUMPS ARE AT MINIMUM VFD SPEED AND THE SYSTEM DP IS ABOVE SETPOINT, THE LAG PUMP IS DE-ENERGIZED AND THE LEAD

PUMP IS MODULATED TO MAINTAIN SETPOINT.

4. THE SCHEDULE AUTOMATICALLY ROTATES THE LEAD/LAG PUMPS.

5. THE PUMPS ARE MONITORED AND ALARMED IF ONE OF THEM FAILS. IF THE LEAD PUMP FAILS, THE LAG PUMP IS ENERGIZED.

EMERGENCY DOMESTIC WATER HEATING OPERATION:

A. GENERAL:

1. IN THE EVENT OF DOMESTIC HOT WATER FAILURE THE MAINTENANCE STAFF SHALL BE ABLE TO MANUALY ENABLE AN

EMERGENCY DOMESTIC HOT WATER MODE THROUGH THE EXSITING BUILDING MANAGEMENT SYSTEM (BMS).

2. CONTRACTOR SHALL PROVIDE PROGRAMING AND CONTROL DEVICES NECESSARY TO IMPLEMENT THE SEQUENCE

DESCRIBED HEREIN.

B. EMERGENCY DOMESTIC HOT WATER (DHW) SEQUENCE:

1. WHEN THE EMERGENCY DHW SEQUENCE IS ACTIVATED, THE BMS SHALL ENABLE BOTH SECONDARY LOOP PUMPS (P-1A & P-1B).

2. THE LEAD PUMP SHALL RUN CONTINUOUSLY AND THE PUMP VFD SHALL MODULATE THE PUMP TO MAINTAIN THE

DIFFERENTIAL PRESSURE (DP) SETPOINT.

3. IF THE PUMP IS UNABLE TO MAINTAIN THE SETPOINT, BOTH PUMPS SHALL BE STARTED AND THEIR SPEED WILL MODULATE VIA THEIR RESPECTIVE VFDs. BOTH PUMPS SHALL RUN AT THE SAME SPEED.

4. IF BOTH PUMPS ARE AT MINIMUM VFD SPEED AND THE SYSTEM DP IS ABOVE SETPOINT, THE LAG PUMP IS DE-ENERGIZED

AND THE LEAD PUMP IS MODULATED TO MAINTAIN SETPOINT.

1 Addendum 2 07/24/2024