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SEQUENCE OF OPERATION GUIDELINE
EXHAUST FAN SYSTEM-MULTIPLE FANS
Document:
Exhaust-Multiple Fan
Revision: 1.0
Rev. Date: July 22, 2011
NOTES:
1. THIS SEQUENCE IS INTENDED TO PROVIDE THE DESIGN PROFESSIONAL WITH ABASIC GUIDELINE OF MINIMUM REQUIREMENTS
FOR A TYPICAL MUTLI FAN
EXHAUST SYSTEM. THIS SEQUENCE SHALL BE CAREFULLY REVIEWED ANDEDITED WITH RESPECT
TO APPLICATION-SPECIFIC PROJECT REQUIREMENTS AND
PROPOSED MODIFICATIO
NS SHALL BE REVIEWED WITH FSU STAFF.
2. THE INTENT IS FOR THIS SEQUENCE TO BE INCLUDED IN THE CONTRACTDRAWINGS.
3.REFERENCE STANDARD CONTROL DIAGRAMS IC-17
PROVIDE THE FOLLOWING FOR EXHAUST FAN SYSTEMS.
1. VARIABLE FREQUENCY DRIVE AND BYPASS DAMPERS WITH STATIC PRESSURECONTROL.
2. AUTOMATIC FAN ROTATION AND FAN FAILURE STANDBY CONTROL. 3. NORMAL TWO FAN OPERATION WITH A DESIGNATED STANDBY FAN OPERATION. SAFETY CONTROL SEQUENCES: PROVIDE THE FOLLOWING SAFETY FUNCTIONS. START-STOP SEQUENCES: PROVIDE THE FOLLOWING OPERATIONAL AND INTERLOCKFUNCTIONS WHEN THE EXHAUST SYSTEM IS
STARTED
OR STOPPED, UNLESS
OTHERWISE NOTED. THESE SEQUENCES SHALL BE FUNCTIONAL FOR ANY REASON THE EXHAUST SYSTEM STARTS-STOPS IN ANY MODE OF OPERATION (ALL VFD MODES, ALLAUTOMATIC AND SAFETY
FUNCTIONS, AND LOCAL MANUAL START-STOP).
1.BYPASS DAMPERS
: OPENBYPASS DAMPERS TO THEIR MINIMUM 25% POSITION
UPON INITIAL STARTUP. CLOSE DAMPERS UPON EXHAUST SYSTEM STOP. 2. FANS: RAMP FAN UP TO MINIMUM SPEED AND ENABLE STATIC PRESSURE CONTROL. SHUT DOWN FANS UPON EXHAUST SYSTEM SHUTDOWN. FAN SPEED CONTROL: PROVIDE STATIC PRESSURE SENSORS MOUNTED IN EXHAUSTDUCTS AS INDICATED ON FLOOR PLAN. CONTROL THE
VARIABLE SPEED DRIVE
FROMMINIMUM TO MAXIMUM S
PEED TO MAINTAIN THE STAITC PRESSURE SETPOINT. IN THEEVENT THE REMOTE STATIC PRESSURE BECOMES
UNRELIABLE, REVERT CONTROL TO
THE STATIC PRESSURE SENSOR LOCATED AT THE EXHAUST PLENUM AND INITIATE AN ALARM. IN THE EVENT MORE THAN ONE STATIC PRESSURE IS SHOWN, THE BAS SHALL CONTROL TO THE SENSOR THAT IS FARTHEST FROM SETPOINTBYPASS DAMPER CONTRO
LIN THE EVENT THE FANS HAVE REACHED THEIR MINIMUM
SPEED AND THE STATIC
PRESSURE REMAINS HIG
H, BEGIN MODULATING
THE BYPASS
DAMPERS BETWEEN THEIR MINIMUM AND MAXIMUM OPEN POSITION. CONTINUE MODULATING THE BYPASS DAMPERS UNTIL THEY REACH THEIR MINIMUM SETTING 25% (ADJ) AT WHICH TIME THE FANS WILL BEGIN RAMPING UP TOWARDS THEIR MAXIMUMSPEED.
SINGLE EXHAUST FAN
FAILURE
: IN THE EVENT ONE OF THE EXHAUST FANS FAIL, IMMEDIATELY START THE STANDBY EXHAUST FAN. THE STANDBY FAN WILL REMAIN ON AND BE RE-DESIGNATED AS THE NEW PRIMARY FAN. THE FAILED FAN SHALL MAINTAIN ITS ALARM CONDITION UNTIL A BAS RESET IS INITIATED TO BRING THE FAILED FAN OUT OF ITS ALARM CONDITION. NOTE: REGARDLESS OF STANDBY FAN ALARM STATE THE BAS SHALL MAKE AN ATTEMPT TO START THE STANDBY FAN IN THEEVENT OF A LEAD FAN
FAILURE.
EXHAUST SYSTEM ROTATION SEQUENCE:
UPON SIGNAL FROM THE BAS TO ROTATE
THE EXHAUST FANS, EXECUTE THE FOLLOWING SEQUENCE.
1. WHILE THE CURRENT LEAD FANS ARE STILL ACTIVE, RUN THE FANS DOWN TO 50% (ADJ). 2.