13-834-017SEQUENCE OF OPERATION:
VAV AHU WITH HYDRONIC COOLING:
BUILDING AUTOMATION SYSTEM INTERFACE
THE BUILDING AUTOMATION SYSTEM ( BAS) ALL SEND THE CONTROLLER OCCUPIED COMMANDS. THE BAS WILL ALSO SEND A DISCHARGE AIR TERMPERATURE
SETPOINT AND A DUCT STATIC PRESSURE SETPOINT. IF COMMUNICATION IS LOST WITH THE BAS, THE CONTROLLER ALL OPERATE IN THE OCCUPIED MODE
USING ITS DEFAULT SETPOINTS.
OCCUPIED:
DURING OCCUPIED PERIODS, THE SUPPLY FAN WILL RUN CONTINUOUSLY AND THE OUTSIDE AIR DAMPER WILL OPEN TO MAINTAIN MINIMUM VENTILATION REQUIREMENTS.
THE CHILLED WATER VALVE WILL MODULATE TO MAINTAIN THE DISCHARGE AIR TEMPERATURE COOLING SETPOINT (55F ADJ.). IF THE DISCHARGE AIR TEMPERATURE
SENSOR FAILS DURING NORMAL OPERATION, THE CHILLED WATER VALVE WILL CLOSE AND AN ALARM WILL BE ANNUNCIATED.
VAV SUPPLY FAN:
WHEN THE CONTROLLER IS IN THE OCCUPIED MODE, THE SUPPLY FAN ALL OPERATE CONTINUOUSLY AND ITS SPEED WILL BE MODULATED TO MAINTAIN THE DUCT
STATIC PRESSURE SETPOINT. THE DUCT STATIC PRESSURE SETPOINT IS SENT BY THE BAS AND IS RESET BETWEEN THE MINIMUM AND MAXIMUM STATIC PRESSURE
LIMITS TO MAINTAIN THE 'CRITICAL ZONE.'
IF THE SUPPLY FAN FAILS TO PROVE STATUS FOR 30 SECONDS (ADJ.), THE FAN WILL BE COMMANDED OFF, THE OUTSIDE AIR DAMPER AND CHILLED WATER VALVE
WILL CLOSE AND AN ALARM WILL BE ANNUNCIATED. A MANUAL RESET IS REQUIRED TO RESTART THE FAN. A HARDWIRED, HIGH STATIC PRESSURE CUT -OFF
SWITCH IS ELECTRICALLY INTERLOCKED WITH THE VARIABLE SPEED DRIVE. IF THE HIGH STATIC PRESSURE CUT -OFF SWITCH IS TRIPPED, THE FAN WILL STOP, THE
OUTSIDE AIR DAMPER AND CHILLED WATER VALVE WILL CLOSE AND AN ALARM WILL BE ANNUNCIATED. A MANUAL RESET OF THE HIGH STATIC PRESSURE CUT -OFF
SWITCH WILL BE REQUIRED TO RESTART THE FAN.
OUTSIDE AIR CONTROL
-
OUTSIDE AIR FLOW SHALL BE MEASURED BY AFS -1 TO ENSURE MINIMUM OUTSIDE AIR PROVIDED TO THE SPACE. RETURN DAMPER D -RET SHALL MODULATE TO
CONTROL OUTSIDE AIR QUANTITY.
A HARDWIRED, LOW LIMIT TEMPERATURE SWITCH IS ELECTRICALLY INTERLOCED WITH THE VARIABLE SPEED DRIVE. IF THE LOW LIMIT TEMPERATURE SWITCH IS TRIPPED
(38F ADJ.), THE OUTSIDE AIR DAMPER WILL CLOSE, THE CHILLED WATER VALVE ALL OPEN TO 100% (ADJUST PER CLIMATE) AND AN ALARM WILL BE ANNUNCIATED.
A MANUAL RESET OF THE LOW LIMIT SWITCH WILL BE REQUIRED TO RESTART THE FAN.
FILTER STATUS:
A DIFFERENTIAL PRESSURE SWITCH WILL MONITOR THE DIFFERENTIAL PRESSURE ACROSS THE FILTER WHEN THE FAN IS RUNNING. IF THE SWITCH CLOSES DURING
NORMAL OPERATION, A DIRTY FILTER ALARM WILL BE ANNUNCIATED.
FIRE ALARM:
UPON ACTIVATION OF FIRE ALARM, RTU SHALL SHUT DOWN ALONG WITH ASSOCIATED EXHAUST FAN.
EXHAUST FAN:
THE AUTO POSI1ION OF THE STARTER SWATCH SHALL BE CONTROLLED BY THE CONTROL SYSTEM. FAN SHALL SHUT DOWN FROM A SIGNAL FROM THE FIRE ALARM
PANEL THE CONTROL SYSTEM SHALL ALARM IF THE FAN FAILS TO START. FAN SHALL BE MATCHED TO THE ASSOCIATED AIR HANDLING UNIT WHICH SERVES
THE SAME AREA AS THE EXHAUST FAN. THE CONTROL SYSTEM SHALL START THE FAN WHENEVER THE AHU IS ENERGIZED AND SHALL DEENERGIZE THE FAN
WHENEVER THE AHU IS DEENERGIZED.
UNOCCUPIED MODE-
THERE IS NO UNOCCUPIED MODE ASSOCIATED WITH THIS SCOPE OF WORK.
BASIS OF DESIGN:
SIEMENS CONTROLS, COORDINATE AND CONNECT TO EXISTING BUILDING BMS.
olAHU-131A3 CONTROL DIAGRAM
SCALE: NTS
CONTROLS SHALL MATCH EXISTING BUILDING CONTROL SYSTEM (TYPICAL): SIEMENS CONTROLS.
Ethernet
Connect to Hospitals EXISTING Remote Apogee Server
To Existing Network
Control Panels
Existltng Control Panel
3NETWORK RISER-
SCALE: 0 NTs
-X
AHU-111A3
'XCM Controller
CONTROLS SHALL CONNECT TO EXISTING BUILDING CONTROL SYSTEM: SIEMENS CONTROLS.
VFD TERMINAL BLOCK
VERIFY WITH VFD MANUFACTURER
ACTUAL TERMINALS TO PERFORM
THE FUNCTION INDICATED.
F- TS -FZ FREEZESTAT
EMERGENCY OFF SD -SA SMOKE DETECTOR
SHALL STOP FAN
UNDER ALL CONDITIONS
ESO -D -SAS S.DMPR END SWITCH
= SPS -SHI STATIC PRESS. HIGH LIMIT
= SPS -SLO STATIC PRESS. LOW LIMIT
FIRE ALARM RELAY
AHU SUPPLY FAN SAFETY WIRING
HARDWIRED SAFETIES IN ADDITION
TO NETWORK INTERFACE BETWEEN
VFD AND DDC CONTROL SYSTEM.
120VAC FROM
CONTROL XFMR
OHAND-r=
DOFF
AUTO
DDC SYSTEM RELAY
aul
FA
COIL OL'S
FAN
STARTER
- FIRE ALARM RELAY TO
SHUTDOWN FAN PER
ASSOCIATED AHU SEQUENCE.
EXHAUST AIR
HOA
'ACE
MPERATURE
ANSMITTER
AI
FREEZESTAT
TS -FZ
FZ -OR
FRZ OVERRIDE
FANS SHALL BE MATCHED TO THE ASSOCIATED AIR HANDLING UNIT WHICH SERVES THE SAME AREA AS THE EXHAUST
FAN. THE DDC CONTROL SYSTEM SHALL START THE FAN WHENEVER THE AHU IS ENERGIZED AND SHALL DEENERGIZE
THE EXHAUST FAN WHENEVER THE AHU IS DDEENERGIZED.
CONNECT EXISTING FAN CONTROLS TO NEW RTU.
BUILDING MANAGEMENT SYSTEM SHALL START AND STOP FAN AND CHECK STATUS.
EXISTNG EF -EX CONTROL
no EXISTING
Hrs
INTERIOR MODIFICATIONS ONLY
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Job No:
412474.00
Date:
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Sheet Title:
Sheet No M9.02
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48774
MECHANICAL
CONTROLS
Job No:
412474.00
Date:
File:
Sheet Title:
Sheet No M9.02