Accurex Vari-Flow Installatie-, Bedienings- en Onderhoudshandleiding - Pagina 13

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SEQUENCE OF OPERATION – VARI-FLOW
System Start Stop
ON
Hood Switch
OFF
NO
Temperature
Interlock
YES
DDC
Temperature
Control
Enabled
Compare Highest
Temperature
Readings with Hood
Operating Temp
Setpoint
Hood VFD Speed
Set According to
Temperature
Sensor
Start & Run
Failure
Hood VFD
MUA/SF VFD
Interlock
FIRE MODE OPERATION
Exhaust on in Fire
START FAN
Fan(s) will run
FIRE?
YES
Exhaust
Supply Fan(s)
Fan(s)
will turn OFF
remain ON
Hood Full Speed
DDC
Temperature
Control
Enabled
Hood VFD Set to
Full Speed
15 minute timer /
Full Speed Cancel
Full Speed
Cancel
Return to System
Start/Stop
FAULT & FAILURE OPERATION
Temp
Exhaust VFD
Fault
System Failure
Light On
MUA/SF
VFD Fault
DDC
Temperature
Control
Enabled
Hood VFD Set to
Full Speed
Exhaust off in Fire
START FAN
Fan(s) will run
NO
FIRE?
YES
Exhaust
Fan(s) will
turn OFF
MUA/SF/OA Damper Pressure Control
NO
Hood Running
Signal Received
YES
Pressure or
Tracking?
TRAK
Compare Space Static
MUA/SF VFD Speed
Pressure Reading
Set by Proportional
with Space
Tracking
Pressure Setpoint
(+.05"WC, adjustable)
MUA/SF
OA Damper
VFD Speed Set
Position Set
According to
(open/closed)
Pressure
Space Pressure
Sensor Failure
(Beyond -
.25/+.25"WC)
Hood VFD Set to
Full Speed
System Failure
Light On
Set MUA to run
on Tracking
NO
Supply
Fan(s) will
turn OFF
Vari-Flow Air Management System
PRES
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