MH701 12.12.2023.pdf

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AI - OSA DAMPER

AI - OSA TEMP

AI - OSA HUMIDITY

OA

IMMERSION SENSOR

BI - FREEZESTAT

AI - CW COIL

LEAVING AIR

TEMP

BO - HUMIDIFIER ENABLE

AI - SUPPLY AIR HUMIDITY

AO - HUMIDIFIER AI - SUPPLY AIR TEMP

BI - SUPPLY AIR SMOKE DETECTOR

BI - HIGH STATIC SHUTDOWN

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N.C.

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VFD

SF

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CT

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AI-CHW COIL RETURN TEMP

AO-3-WAY MODULATING CONTROL VALVE

AO-2-WAY MODULATING CONTROL VALVE

CHR

CHS

HWS

HWR

H L

SA

AO-2-WAY MODULATING

CONTROL VALVE

BO-2-POSITION

CONTROL VALVE

BO-3-WAY 2-POSITION

CONTROL VALVE

BI-SUPPLY FAN STATUS

BI-SUPPLY FAN VFD FAULT

AO-SUPPLY FAN VFD SPEED

BO-SUPPLY FAN START/STOP

AI-SUPPLY AIR STATIC

PRESSURE

AI-SPACE TEMPERATURE

AI-SPACE HUMIDITY

LOCATE 3/4 DISTANCE

DOWN LONGEST DUCT

CHW CHWHW

STM

DOAS SEQUENCE OF OPERATION:

GENERAL

UNIT IS NORMALLY STARTED AND STOPPED REMOTELY AT THE ECC. H-O-A SWITCH SHALL

BE KEPT IN THE "AUTO" POSITION. "HAND" AND "OFF" POSITIONS SHALL BE USED ONLY FOR

MAINTENANCE.

TEMPERATURE CONTROL

SUPPLY AIR TEMPERATURE, SENSED BY THERMOSTAT IN DUCT, SHALL BE MAINTAINED AT

SETPOINT, 68°F, VIA DIGITAL CONTROL PANEL, BY MODULATING PREHEAT COIL CONTROL

VALVE OR COOLING COIL CONTROL VALVE UNLESS ADJUSTED BY THE REMAINDER OF THIS

SECTION. MAINTAIN TEMPERATURE IN SPACE AT 68°F . IF ALL TERMINAL UNITS ARE

CALLING FOR HEAT, INCREASE SUPPLY AIR TEMPERATURE IN 5 MINUTE INCREMENTS UNTIL

ANY UNIT STOPS CALLING FOR HEAT. IF NO TERMINAL UNITS ARE CALLING FOR HEAT OR

SPACE THERMOSTAT IS ABOVE SETPOINT, DECREASE SUPPLY AIR TEMPERATURE IN 5

MINUTE INCREMENTS UNTIL SPACE TEMPERATURE REACHES SETPOINT. SUPPLY AIR

LIMITS ARE 50°F AND 85°F.

WHEN THE OUTSIDE AIR TEMPERATURE IS ABOVE 75°F (ADJ), THE DCP SHALL CLOSE THE

PREHEAT COIL VALVE AND PREVENT THE MODULATION OF THE VALVE.

AIR FLOW CONTROL

THE SUPPLY AIR FLOW SHALL BE MEASURED BY DUCT-MOUNTED AFMD. AIRFLOW SHALL

BE CONTROLLED BY THE DCP, MODULATING THE SUPPLY FAN VARIABLE SPEED MOTOR

CONTROLLER TO MAINTAIN 1.0" OF DUCT STATIC PRESSURE (ADJ). RESET STATIC

PRESSURE BASED ON ACTUAL BUILDING LOAD BY POLLING ALL TERMINAL UNITS. IF ALL

UNITS HAVE A DAMPER POSITION LESS THAN 95% OPEN, REDUCE STATIC PRESSURE IN

0.05" INCREMENTS UNTIL ONE UNIT REACHES 95% OR MORE.

HIGH PRESSURE SENSOR AT THE SUPPLY FAN DISCHARGE SHALL BE USED TO LIMIT

SUPPLY FAN STATIC PRESSURE TO 3" (FIELD ADJUSTABLE). IF STATIC PRESSURE EXCEEDS

3" THE SUPPLY

AIR FAN SHALL STOP. EVENT WILL REQUIRE MANUAL RESET AT THE DEVICE.

IF SUPPLY AIR SMOKE DETECTORS SENSE SMOKE, THE SUPPLY AIR FAN SHALL STOP AND

CLOSE ALL DAMPERS. EXHAUST FANS SERVING AREA OF THE SUPPLY FAN SHALL

CONTINUE TO RUN. SUPPLY FAN SHALL RESTART

AND DAMPERS SHALL OPEN WHEN FIRE ALARM CIRCUIT IS RESET.

IN THE EVENT OF ANY SUPPLY FAN STOPPAGE, ALL DOAS AND TERMINAL UNIT DAMPERS

SHALL CLOSE.

HUMIDITY CONTROL

WHEN THE DCP IS NOT CALLING FOR HUMIDITY, 2-WAY "ON-OFF" CONTROL VALVE SHALL

REMAIN CLOSED. WHEN THE DCP IS CALLING FOR HUMIDITYTHE CONTROL SHALL REMAIN

OPEN.

FREEZE PROTECTION

IF SUPPLY AIR IS BELOW 40°F, OPEN HEATING COIL VALVE TO 100% AND SEND ALARM TO

ECC. IF SUPPLY AIR IS BELOW 35°F, OPEN COOLING COIL AND HEATING COIL VALVES TO

100% AND SEND ALARM TO ECC. IF SUPPLY AIR TEMP IN BELOW 32°F, SHUT DOWN SUPPLY

AIR FAN, CLOSE ALL DAMPERS, AND SEND ALARM TO ECC.

FAILURE OF MOTOR CONTROLLER

UPON FAILURE OF VARIABLE SPEED MOTOR CONTROLLER, THE SUPPLY FAN SHALL BE

STARTED/STOPPED MANUALLY AT THE DIGITAL CONTROL PANEL OR THE ECC THROUGH

THE BY-PASS STARTER. FANS SHALL THEN BE OPERATED AT CONSTANT SPEED AND AN

ALARM SIGNAL TRANSMITTED TO THE ECC.

SEQUENCE OF OPERATION:

RUN CONDITIONS:

RUN CONDITIONS:

THE CHILLER SYSTEM WILL BE ENABLED WHEN ITS ASSOCIATED AHU OR DOAS UNITS

ARE IN DEHUMIDIFICATION MODE AND SEND AN "ON COMMAND" TO THE MODULAR

CHILLER.

NORMAL OPERATION MODE:

WHEN THE CHILLER IS NOT ENABLED THE BYPASS VALVES WILL OPERATE IN BYPASS

MODE. ONCE THE CHILLER IS ENABLED THE BYPASS VALVES WILL BE COMMANDED OPEN

TO THE CHILLER.

AFTER A TIME DELAY, AS DETERMINED ON THE STROKE TIME OF THE VALVE ACTUATOR,

THE CIRCULATION PUMP VFD WILL BE ENABLED.

THE CHILLED WATER PUMP VFD SHALL RAMP TO THE SPEED NEEDED TO MAINTAIN THE

DIFFERENTIAL PRESSURE SETPOINT AS MEASURED BY THE DIFFERENTIAL PRESSURE

TRANSDUCER (LOCATED 2/3 THE DISTANCE OF THE COMMON RUN).

THE PRESSURE SETPOINT WILL BE DETERMINED BY THE TAB PROVIDER. ONCE THE PUMP

OPERATION HAS BEEN CONFIRMED VIA A CONTACT ON THE VFD THE CHILLER WILL BE

ENABLED TO RUN.

A CHILLED WATER SUPPLY SETPOINT WILL BE SENT TO THE CHILLER USING A 4-20mA OR

0-10VDC SIGNAL. IF THE HIGHEST ZONE IS LESS THAN OR EQUAL TO 50% RH THE INITIAL

SETPOINT WILL BE 48°F (ADJ.). AS THE HIGHEST ZONE HUMIDITY INCREASES TO 58% RH

(ADJ.) THE CHILLED WATER SUPPLY SETPOINT WILL PROPORTIONALLY RESET TO 42°F

(ADJ.).

WHEN THE CHILLER "ON COMMAND" SIGNAL IS NO LONGER BEING RECEIVED AT THE

CHILLER THE CHILLER COMMAND WILL BE DISABLED AND THE PUMPS WILL RUN AN

ADDITIONAL 2 MINUTES (ADJ.). WHEN THE PUMP IS CONFIRMED TO BE OFF THE BYPASS

VALVES WILL BE COMMANDED CLOSED TO THEIR BYPASS POSITION.

CHILLED WATER SUPPLY TEMPERATURE RESPONSE TIME SHALL BE LESS THAN 5

MINUTES (ADJ.).

PRESSURE RESPONSE TIME WILL BE ACHIEVED WITHIN 5 MINUTES (ADJ.).

ALARMS WILL BE PROVIDED AS FOLLOWS:

HIGH SUPPLY WATER TEMP: IF THE SUPPLY WATER TEMPERATURE IS 5°F (ADJ.) GREATER

THAN SETPOINT. LOW SUPPLY WATER TEMP: IF THE SUPPLY WATER TEMPERATURE IS 5°

F (ADJ.) LESS THAN SETPOINT.

CHILLER FAULT.

CHILLER PUMP IS ENABLED AND THE STATUS IS OFF.

NOTE: IF DIRECT CONTROL OF CHILLER IS REQUIRED STAGING OF COMPRESSORS WILL

REQUIRE TIME DELAYS OF 2 MINUTES AS A MINIMUM.

DOAS

FCUs AHUs

CHWS

CHWR

DPT

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COND

AIR COOLED

CHILLER

EVAP

CHWS

CHWS

CHWS

CHWR

CHWR

CHWR

CHWR

CHWS

BYPASS CIRCUIT

CAMPUS LOOP

BYPASS CIRCUIT

IMMERSION SENSOR

TWO POSITION

CONTROL VALVE

FOR BYPASS

CONTROL

IMMERSION

SENSOR MANUAL CHILLER ISOLATION VALVE

CHILLER PUMPS

IMMERSION SENSOR

IMMERSION

SENSOR

TWO POSITION

CONTROL VALVEW

FOR BYPASS

CONTROL

MANUAL CHILLER

ISOLATION VALVE

HARDWARE POINTS SOFTWAREPOINTS

POINTS NAME AI AO BI BO AV BV LOOP SCHED TREND ALARM SHOW ON GRAPHICS

CHILLED WATER SUPPLY TEMPERATURE X X X X

CHILLED WATER RETURN TEMPERATURE X X X

CONDENSOR WATER SUPPLY TEMPERATURE X X X X

CONDENSOR WATER RETURN TEMPERATURE X X X

CONDENSOR WATER RETURN TEMPERATURE X X X

CHILLED WATER RESET TEMPERATURE X X X

CHILLED WATER PUMP COMMAND X X X

CHILLER FAULT X X X X

CHILLER PUMP STATUS X X X X

CHILLER ENABLE X X X

CHILLER PUMP ENABLE X X X X

BYPASS VALVE OPEN COMMAND X X X

HIGH SUPPLY WATER TEMP X X X X

LOW SUPPLY WATER TEMP X X X X

5 2 2 5 0 0 0 0 14 7 14

TOTAL HARDWARE (14) TOTAL SOFTWARE (21)

GENERAL - SYSTEM POINTS LIST

POINT TYPES ALARMS

SYSTEM POINT DESCRIPTION

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NOTES:

ROOM DIFFERENTIAL PRESSURE X AI X X X

HOT WATER TEMP X AI X

BAS COMMUNICATION STATE X 2 HRS X 1

CHILLED WATER RETURN X AI

REFRIGERANT TEMP X AI

CONTROLLER SPARE HARDWARE POINTS

ANALOG INPUT(S) 4

BINARY INPUT(S)

UNIVERSAL INPUT(S)

BINARY OUTPUT(S)

GENERAL NOTES

1. DISPLAYED AT THE BAS USER INTERFACE

PROJECT NUMBER

BUILDING

DRAWING NUMBER

PROJECT TITLE

LOCATION

ISSUE DATE CHECKED DRAWN

DRAWING TITLE

A

Office of Construction and Facilities Management

U.S. Department of Veterans Affairs

B

C

D

E

F

A

B

C

D

E

F

21 4 5 6 7 8 9 10

PHASEARCHITECT/ENGINEER OF RECORD SEALCONSULTANTS

321 4 5 6 7 8 9 10

DWG. OF

NAME:

FULLY SPRINKLERED

CONTRACTING OFFICER'S REPRESENTATIVE

FULL SIZE DWG: 30x42

PHONE:

EMAIL:11031 S. PIKES PEAK DRIVE #102 PARKER, COLORADO 80138 PH. 303.841-3922

RENOVATE AND EXPAND

COMMUNITY LIVING

CENTER (CLC)

SPOKANE, WA

668-318

100% SUBMITTAL

CONSTRUCTION

DOCUMENTS (CD)

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MH701

MECHANICAL CONTROLS

APRIL 2023 CDL TJH

118 183

David Arment 509-964-1889 David.Arment@va.gov

SCALE: NTS

CONTROL DIAGRAM - DOAS AHU SYSTEM2

SCALE: NTS

CONTROL DIAGRAM - CHILLER3

SCALE: NTS

DOAS CONTROL POINTS LIST1

REVISIONS DATE 3 APRIL 2023