S02 - 640-381.MVW.6.2011.2011.MOUNTAIN_VIEW_CENTER.CONTROL_DIAGRAMS_MECH.MH8.01.pdf
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- Attached to
- Y1DA--640-20-107 MV-HR BMS HVAC CONST
- Solicitation number
- 36C26120B0013
About this file
This document provides control diagrams and sequence of operation for an HVAC system at the Mountain View Center VA medical facility. It details the control logic and setpoints for modulating dampers, fans, cooling equipment and heating coils to maintain temperature setpoints for various operating modes including warm-up, cool-down, unoccupied override, smoke detection shutdown and economizer-based free cooling. It also lists interface points to be provided by the controls contractor to the building automation system for monitoring and control of unit status, temperatures, pressures, speeds and alarms.
The related federal contract opportunity is a solicitation for HVAC construction services including the building management system and controls work. Offerors are instructed not to contact individual VA medical centers directly for more information and must instead search for solicitation 36C26120B0013 on SAM.gov. The opportunity is being conducted by the Department of Veterans Affairs Veterans Health Administration VISN 21 for Project #640-20-107 at the Mountain View Center VA medical facility.
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Text version
SEQUENCE OF OPERATION:
EXHAUST AIR DAMPER
ACTUATOR
RETURN AIR DAMPER
ACTUATOR
OUTSIDE
TEMP.
AIR
TEMP.
D/PT
AIR
MIXED
OUTSIDE AIR DAMPER
ACTUATOR
E R
F
L T
I
SUPPLY FAN
VFD
TEMP.
SUPPLY
AIR
T P
(DIV. 16)
DETECTOR
DUCT SMOKE
SUPPLY AIR
120 VAC
E
SD
DUCT
DIFFERENTIAL
PRESSURE
(LOCATE 3/4
WAY DOWN
LONGEST DUCT)
T
RETURN AIR TEMPERATURE
X
D TO BAS
BACNET
INTERFACE
PANEL
T
T
RETURN FAN
VFD
AC CONTROLLER
(FACTORY
MOUNTED)
NOTE:
AHU MANUFACTURER TO PROVIDE BMS
INTERFACE PANEL AND NECESSARY
START-UP AND PROGRAMMING
T
ZONE TEMP. STPT.
ZONE TEMP.AO
AI
PAI
BUILDING
PRESSURE
CAI
CO2
SENSOR
INPUT TYPE
MIXED AIR TEMPERATURE
OUTDOOR AIR TEMPERATUREAI
AI
RETURN AIR TEMPERATURE
SUPPLY AIR TEMPERATURE
VFD RUN STATUS
VFD FAULT
FILTER STATUS (PER FILTER)
RETURN FAN STATUS
AHU STATUS
COMMUNICATIONS STATUS
DESCRIPTION
DI
DI
AI
AI
DI
DI
DI
DI
VFD SPEED
DUCT DIFFERENTIAL PRESSURE
AHU START/STOP
DUCT DIFFERENTIAL PRESSURE SETPOINT
DO
AO
AO
AI
CO2 LEVEL MONITOR/CONTROLAI
ECONOMIZER
UNOCCUPIED OVERRIDETHE OPERATOR WORKSTATION / NETWORK CONTROLLER, THROUGH A USER
PROGRAMMABLE SCHEDULE, SHALL ENABLE THE OPERATION OF A/C UNITS.
WHEN IN OPERATION THE SUPPLY AND RETURN FAN SHALL BE START/STOPPED
BY THE AHU UNITS CONTROLLER. FAN STATUS ON THE SUPPLY AND RETURN
FAN SHALL BE MONITORED. AN ALARM MESSAGE SHALL BE INDICATED WHEN
THE FAN IS NOT CORRECTLY OPERATING AT THE OPERATOR WORKSTATION. A
HIGH LIMIT DUCT PRESSURE SWITCH SHALL DISABLE THE VFD'S THROUGH THE
UNIT CONTROLLER WHEN THE HIGH LIMIT IN THE SUPPLY AIR DUCT IS
REACHED. AN ALARM MESSAGE SHALL BE INDICATED AT THE OPERATOR
WORKSTATION WHEN THIS OCCURS.
THE VFD ON THE SUPPLY FAN SHALL BE USED TO MODULATE THE FAN TO
MAINTAIN SUPPLY DUCT STATIC PRESSURE AND THE RETURN FAN VFD SHALL
MODULATE TO MAINTAIN SPACE PRESSURE. SUPPLY FAN STATIC PRESSURE
SHALL BE RESET BASED ON TERMINAL UNIT DEMAND AS REQUIRED BY
TITLE 24.
THE OUTSIDE AIR AIRFLOW MEASURING STATION SHALL ASSURE THAT THE
MINIMUM AIRFLOW IS PROVIDED BY THE AIRFLOW MEASURING STATION
OUTSIDE AIR DAMPER.
THE DISCHARGE TEMPERATURE SHALL BE MAINTAINED AT AN ADJUSTABLE
SETPOINT THROUGH THE MODULATION OF THE RETURN AIR (RA),
EXHAUST AIR, HOT WATER VALVE, OUTSIDE AIR (OA) DAMPERS, AND DX
SYSTEM IN SEQUENCE.
THE OUTSIDE, DISCHARGE, RETURN, AND MIXED AIR TEMPERATURES SHALL
ALL BE MONITORED THROUGH THE AHU FOR USE IN THE FOLLOWING
ENERGY MANAGEMENT SEQUENCES:
THE OUTSIDE(OA), RETURN(RA) DAMPERS, AND EXHAUST AIR (EA)
DAMPERS SHALL MODULATE TO MAINTAIN THE DESIRED DISCHARGE
TEMPERATURE (55°F-INITIAL). IF ADDITIONAL COOLING IS REQUIRED, THE
DX SYSTEM SHALL BE STAGED AS NECESSARY TO MAINTAIN THE DESIRED
DISCHARGE TEMPERATURE.
WHEN THE OAT >= FREE COOLING ADJUSTABLE SETPOINT, OA, EA
DAMPERS AND RA DAMPERS SHALL BE RESET FOR MINIMUM OUTSIDE AIR,
THE DX SYSTEM SHALL STAGE IN SEQUENCE TO MAINTAIN THE DESIRED
DISCHARGE TEMPERATURE.
WHEN THE OUTSIDE AIR TEMPERATURE (OAT) < FREE COOLING
ADJUSTABLE SETPOINT:
AREA WARM-UP OR COOL-DOWN TWO HOURS PRIOR TO OCCUPANCY.
DURING WARM-UP, THE OA DAMPER SHALL BE DRIVEN TO MINIMUM OUTSIDE
AIR POSITION AND THE MA DAMPER SHALL BE DRIVEN TO MINIMUM OUTSIDE
AIR POSITION AND EA DAMPER DRIVEN CLOSED. THE MORNING WARM-UP
HEATING COIL VALVE SHALL BE DRIVEN 100% OPEN FOR MAXIMUM
HEATING. THIS WILL CONTINUE UNTIL THE SPACE TEMPERATURE IS AT THE
ADJUSTABLE SETPOINT (68 DEG. F). THE SYSTEM AT THIS POINT SHALL
RETURN TO NORMAL OCCUPIED OPERATION. SCHEDULE TITLE 24
PRE-OCCUPANCY PURGE AND VENTILATION FOR 1 HOUR PRIOR TO MORNING WARM-UP
SEQUENCE.
DURING COOL-DOWN, IF OAT < RAT, THE OA DAMPER AND EA DAMPER SHALL
BE FULLY OPENED AND THE MA DAMPER SHALL BE CLOSED. THE SUPPLY FAN
AND RETURN FAN SHALL BE STARTED. THE DX SYSTEM SHALL BE STAGED AS
NECESSARY TO ACHIEVE BUILDING COOL DOWN. WHEN THE SPACE
TEMPERATURE < ADJUSTABLE SETPOINT, THE SYSTEM SHALL RETURN TO
NORMAL OPERATION. PROVIDE TITLE 24 PRE-OCCUPANCY AND VENTILATION.
UPON SMOKE DETECTION IN THE SUPPLY AIR DUCT, THE SUPPLY AND
RETURN FAN SHALL BE STOPPED THROUGH THE DDC CONTROLLERS. SYSTEM
WILL OPERATE IN SHUT DOWN MODE.
RESET STRATEGIES DUCT STATIC RESET: RESET DUCT STATIC PRESSURE TO
MINIMUM REQUIRED TO MAINTAIN ZONE TERMINAL UNIT SETPOINTS. SUPPLY
AIR TEMPERATURE RESET: RESET SUPPLY AIR TEMPERATURE TO MAXIMIZE
ECONOMIZER USE AND MINIMIZE DX SYSTEM USE WITHOUT COMPROMISING
SPACE TEMPERATURE.
AIR POSITION AND THE MA DAMPER SHALL BE DRIVEN TO MINIMUM OUTSIDE
HW CONTROL VALVE OF ALL VAV TERMINAL UNITS WITH REHEAT CONTROL VALVE
SHALL BE SET AT CLOSED POSITION DURING MORNING WARM UP. AFTER MORNING
WARM UP MODE, HW CONTROL VALVE AT AHU SHALL CLOSE WHILE CONTROL VALVES
AT VAV WITH REHEAT SHALL RESET TO NORMAL OPERATION.
SMOKE DETECTION
DUCT STATIC RESET
SUMMER NIGHT PURGE MODE SHALL BE SCHEDULED AT DDC CONTROLLER.
WHEN ENABLED, PURGING SHALL COMMENCE WHEN OAT IS AT LEAST 50°F
(ADJUSTABLE) LESS THAN INDOOR TEMPERATURE (750°F ROOM TEMPERATURE,
NIGHT PURGE
ADJUSTABLE). OA AND EA DAMPERS SHALL OPEN AT 100% POSITION WHILE
RAD WILL BE AT MINIMUM. UPON PROOF OF DAMPER OPERATION POSITION,
SUPPLY AND RETURN FANS SHALL RUN AT FULL SPEED (ADJUSTABLE).
ALL TERMINAL UNITS SHALL BE ENABLED AND INLET DAMPERS AT FULLY OPEN
POSITION. DX REFRIGERATION COOLING SHALL BE DISABLED DURING NIGHT
PURGE MODE.
DDC
INTERFACE POINTS LIST (POINTS LISTED
BELOW, NOT AVAILABLE THROUGH MFR.
CONTROLLERS, SHALL BE PROVIDED
SEPARATELY BY CONTROLS
CONTRACTOR)
1 AHU-1 CONTROL DIAGRAM
NO SCALE
(DIV. 16)
DETECTOR
DUCT SMOKE
RETURN AIR
120 VAC
E
SD
Office of Construction and Facilities Management
N
E N G I N E E R I N G
I N T E R F A C E
TEL
FAX
PROJECT:
CONTACT:
www.interfaceengineering.com
717 Market Street
Suite 500
San Francisco, CA 94103
415.489.7240
415.489.7289
Date Signed: ----
EFORP
DERET
SI
GE
R
R E
E
NI
GN
E
LA
NOISS
CA L I FO
RN
I AS TA T E OF
Exp. 06-30-2012
No. M29691
M
E C H A N IC A L
G E
OR
GE
L . ARELLA
N O
C o p yr ig h t
S te in b e rg
A rc h it e c ts
A ll R ig h ts
R e s e rv e d
T h e s e
P la n s a n d o r S p e c if ic a ti o n s a re in te n d e d fo r th e s o le b e n e fi t o f S te in b e rg
A rc h it e c ts c lie n t a n d m a y n o t b e u s e d re u s e d ,c o p ie d ,o r re p ro d u c e d in a n y fo rm w it h o u t th e e x p re s s w ri tt e n c o n s e n t o f S te in b e rg
A rc h it e c ts
George Arellano
2010-0410
DATEREV ISSUE
ARCHITECT
PROJECT #:
DATE:
SCALE:
CLIENT
Steinberg Architects 98 Battery Street, Suite 300 San Francisco, CA 94111
02.09.2011 100% Schematic Design
03.16.2011 100% Design Development
05.02.2011 90% Construction Documents
05.31.2011 100% Construction Documents
/2 /2 :2 :5 A M
C R e v it L o c a l\ -0 V a P a lo A lt o \V A P a lo A lt o
J o n e s B ld g E B v .r v t
1776 OLD MIDDLEFIELD
ROAD, MOUNTAIN VIEW, CA
94043
MH8.01
VAPAHCS Mountain View Center - #640-381
CONTROL DIAGRAMS -
MECHANICAL
10037.00 5.31.2011
VA Palo Alto Health Care System 3801 Miranda Ave. Building 6, C360 Palo Alto, CA 94304
100%
CONSTRUCTION
DOCUMENTS
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