50-M704.pdf

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1. DUCTLESS SPLIT SYSTEMS (DSS-1)

A. DUCTLESS SPLIT SYSTEMS SHALL HAVE SYSTEM MANUFACTURER'S STANDARD WALL-MOUNTED PROGRAMMABLE CONTROLLER. SYSTEM

SHALL OPERATE UNDER ITS BUILT-IN, FACTORY INSTALLED CONTROL SYSTEM TO MAINTAIN ROOM TEMPERATURE SET POINT (72°F). AN INDEPENDENT, WALL-MOUNTED TEMPERATURE SENSOR SHALL MONITOR ROOM TEMPERATURE AND SEND AN ALARM TO THE BMS PANEL IF ROOM TEMPERATURE RISES ABOVE 85°F (ADJUSTABLE). HIGH TEMPERATURE ALARM SHALL REQUIRE MANUAL RESET. THE BMS SHALL

MONITOR COMPRESSOR STATUS.

BI-COMPRESSOR STATUS

CT

BI-FAN STATUS

EP

AI-SPACE TEMPERATURE

EP

AIR-COOLED CONDENSER

DUCTLESS SPLIT SYSTEM EVAPORATOR FAN

CT

AI -ZONE TEMP

AI -ZONE SETPOINT ADJUST

SEQUENCE OF OPERATION

VARIABLE TERMINAL AIR BOX

1. GENERAL

A. THE VARIABLE TERMINAL AIR BOX SHALL ACCORDING TO USER DEFINABLE TIME SCHEDULE IN THE

FOLLOWING MODES:

2. TEMPERATURE CONTROL

A. THE UNIT SHALL MAINTAIN

a. A 75°F (ADJ) COOLING SETPOINT

b. A 72°F (ADJ) HEATING SETPOINT

B. THE UNIT SHALL MAINTAIN ZONE SETPOINTS BY CONTROLLING THE AIRFLOW THROUGH ONE OF THE

FOLLOWING.

C. NORMAL AND EMERGENCY MODE:

a. WHEN THE ZONE TEMPERATURE IS GREATER THAN THE COOLING SETPOINT, THE ZONE DAMPER

SHALL MODULATE BETWEEN THE MINIMUM OCCUPIED AIRFLOW (ADJ) AND THE MAXIMUM COOLING

AIRFLOW (ADJ) UNTIL THE ZONE IS SATISFIED.

b. WHEN THE ZONE TEMPERATURE IS BETWEEN THE COOLING SETPOINT AND THE HEATING SETPOINT, THE ZONE DAMPER SHALL MAINTAIN THE MINIMUM ZONE AIRFLOW (ADJ).

c. WHEN THE ZONE TEMPERATURE IS LESS THAN THE HEATING SETPOINT, THE CONTROLLER SHALL

ENABLE HEATING VALVE AND THE ZONE DAMPER SHALL MODULATE BETWEEN THE MINIMUM AND

MAXIMUM HEATING CFM TO MAINTAIN THE ZONE TEMPERATURE AT THE HEATING SETPOINT.

NOTE:

1. PROVIDE CONTROL TRANSFORMER

SERVINGLOCAL GROUPS OF AIR TERMINAL

UNITS (5 VAV BOXES MAX PER TRANSFORMER.)

AO - REHEAT VALVE

AI - DISCHARGE AIR TEMPERATURE

DISCHARGE AIR

AO - ZONE DAMPER

AI - AIRFLOW

SUPPLY AIR

T M

H W

S H

W R

T

T

T

HEAT EXCHANGER

VFD

DPS

SEQUENCE OF OPERATION

HEATING HOT WATER PUMPS

1. GENERAL

A. TWO 100% CAPACITY HEATING WATER PUMPS ARE PROVIDED IN THE SYSTEM (ONE

PUMP IS REDUNDANT).

2. HOT WATER PUMP LEAD/STANDBY OPERATON:

A. THE TWO HOT WATER PUMPS SHALL OPERATE IN LEAD/STANDBY FASHION.

a. THE LEAD PUMP SHALL RUN FIRST.

b. ON FAILURE OF THE LEAD PUMP, THE STANDBY PUMP SHALL RUN AND THE LEAD

PUMP SHALL TURN OFF.

B. THE DESIGNATED LEAD PUMP SHALL ROTATE UPON ONE OF THE FOLLOWING

CONDITIONS (USER SELECTABLE):

a. MANUALLY THROUGH A SOFTWARE SWITCH

b. IF PUMP RUNTIME (ADJ.) IS EXCEEDED

c. DAILY

d. WEEKLY

e. MONTHLY

C. ALARMS SHALL BE PROVIDED AS FOLLOWS:

HOT WATER PUMP 1

a. FAILURE: COMMANDED ON, BUT THE STATUS IS OFF.

b. RUNNING IN HAND: COMMANDED OFF, BUT THE STATUS IS ON.

c. RUNTIME EXCEEDED: STATUS RUNTIME EXCEEDS A USER DEFINABLE LIMIT.

HOT WATER PUMP 2

a. FAILURE: COMMANDED ON, BUT THE STATUS IS OFF.

b. RUNNING IN HAND: COMMANDED OFF, BUT THE STATUS IS ON.

c. RUNTIME EXCEEDED: STATUS RUNTIME EXCEEDS A USER DEFINABLE LIMIT.

A0 DIFFERENTIAL PRESSURE SETPOINT

AI DIFFERENTIAL PRESSURE SETPOINT

HWS HWS HWS

HWR HWR HWR

HWR

LPS

HWS

VFD

BI HOT WATER PUMP LEAD/LAG

BI PUMP STATUS

BO PUMP START/STOP

AO PUMP VFD SPEED

BI PUMP VFD FAULT

3. HOT WATER DIFFERENTIAL PRESSURE CONTROL:

A. THE CONTROLLER SHALL MEASURE HOT WATER DIFFERENTIAL PRESSURE AND

MODULATE THE HOT WATER PUMP VFD TO MAINTAIN ITS HOT WATER DIFFERENTIAL

PRESSURE SETPOINT. ALL SETPOINTS SHALL BE FIELD ADJUSTED DURING THE

COMMISSIONING PERIOD TO MEET THE REQUIREMENTS OF ACTUAL FIELD CONDITIONS.

B. THE CONTROLLER SHALL MODULATE HOT WATER PUMP SPEEDS TO MAINTAIN A HOT

WATER DIFFERENTIAL PRESSURE (ADJ.). THE VFDS MINIMUM SPEED SHALL NOT DROP

BELOW 20% (ADJ.).

C. ALARMS SHALL BE PROVIDED AS FOLLOWS:

a. HIGH HOT WATER DIFFERENTIAL PRESSURE: IF 25% (ADJ.) GREATER THAN

SETPOINT.

b. LOW HOT WATER DIFFERENTIAL PRESSURE: IF 25% (ADJ.) LESS THAN SETPOINT.

BI HOT WATER PUMP LEAD/LAG

BI PUMP STATUS

BO PUMP START/STOP

AO PUMP VFD SPEED

BI PUMP VFD FAULT

DUCT STATIC PRESSURE

SENSOR 2/3 ON THE

LONGEST RUN.

NOTE TO TEMPERATURE CONTROL CONTRACTOR:

CONTROL CONTRACTOR SHALL BE RESPONSIBLE FOR

PROVIDING THE CORRECT TYPE, SIZES AND QUANTITIES OF

CONTROL CABLES, CONTROLLERS, SENSORS,

TRANSFORMERS, DEVICES AND PROGRAMMING

NECESSARY FOR A FULLY FUNCTIONAL SYSTEM.

o n e e ig h th in c h o n e fo o t th re e in c h e s o n e fo o t o n e a n d o n e h a lf in c h e s o n e fo o t o n e in c h o n e fo o t th re e q u a rt e rs in c h o n e fo o t o n e h a lf in c h o n e fo o t th re e e ig h th s in c h o n e fo o t o n e q u a rt e r in c h o n e fo o t

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Drawing Title Project Title

VA FORM 08-6231

Office of Facilities Management

U.S. Department of Veterans Affairs

STAMP

Date

Location

Building Number Checked Drawn Drawing Number

Project Number

BID SET

Approved: Director

Approved: Associate Director

Approved: Assistant Director

Approved: Assoc. Director for Patient Care Service/Nurse Executive

Approved: Deputy Assoc. Director of Patient Care Services

Approved: Chief of Staff

Approved: Deputy Chief of Staff

Approved: Chief of Engineering

Approved:

Approved:

ARCHITECT/ENGINEER/CONSULTANTS:

Bancroft Project No.

SAVAHCS, TUCSON, AZ 85723

3300 Dundee Road

Northbrook, IL 60062

T: 847.952.9362

04/30/2024MECHANICAL - CONTROLS EXPAND AND RENOVATE

EMERGENCY DEPARTMENT B50

50 DGG TE

50-M704

678-331

8-

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NOT TO SCALE

DUCTLESS SPLIT SYSTEM (DSS-1) CONTROL DIAGRAM

NOT TO SCALE

VARIABLE TERMINAL AIR BOX

LOW ZONE TEMPERATURE X

LOW DISCHARGE AIR TEMPERATURE X

HIGH ZONE TEMPERATURE X

HIGH DISCHARGE AIR TEMPERATURE X

HEATING/COOLING MODE X X

DISCHARGE AIR TEMPERATURE HEATING LIMIT X

COOLING/HEATING SETPOINT X X X

AIRFLOW SETPOINT X X X

ZONE DAMPER X X X

HOT WATER HEATING VALVE X X X

ZONE TEMPERATURE X X X

AIRFLOW X X X

ZONE SETPOINT ADJUST X X

DISCHARGE AIR TEMPERATURE X X X

POINT NAME AI AO BI BO AV BV SCHED TREND ALARM SHOW ON GRAPHIC

HARDWARE POINTS SOFTWARE POINTS

VARIABLE TERMINAL AIR BOX POINTS LIST

COMPRESSOR STATUS X X X X

SPACE TEMPERATURE X X X X

FAN STATUS X X

POINT NAME AI AO BI BO AV BV SCHED TREND ALARM SHOW ON GRAPHIC

HARDWARE POINTS SOFTWARE POINTS

DUCTLESS SPLIT (DSS-1) SYSTEM POINTS LIST

HOT WATER PUMP 2 RUNTIME EXCEEDED X

HOT WATER PUMP 2 RUNNING IN HAND X

HOT WATER PUMP 2 FAILURE X

HOT WATER PUMP 2 START/STOP X X

HOT WATER PUMP 2 STATUS X X X

HOT WATER PUMP 2 VFD FAULT X X X

HOT WATER PUMP 2 VFD SPEED X X X

HOT WATER PUMP 1 RUNTIME EXCEEDED X

HOT WATER PUMP 1 RUNNING IN HAND X

HOT WATER PUMP 1 FAILURE X

HOT WATER PUMP 1 START/STOP X X

HOT WATER PUMP 1 STATUS X X X

HOT WATER PUMP 1 VFD FAULT X X X

HOT WATER PUMP 1 VFD SPEED X X X

LOW HOT WATER DIFF. PRESSURE SETPOINT X

HIGH HOT WATER DIFF. PRESSURE SETPOINT X

HOT WATER DIFF. PRESSURE SETPOINT X X

HOT WATER DIFF. PRESSURE X X X

POINT NAME AI AO BI BO AV BV SCHED TREND ALARM SHOW ON GRAPHIC

HARDWARE POINTS SOFTWARE POINTS

HEATING HOT WATER PUMPS POINTS LIST

NOT TO SCALE

HEATING HOT WATER PUMPS CONTROL DIAGRAM

Revisions: Date:

BID SET 05/01/2023

ADDENDUM 1 04/30/2024