Greenheck Vari-Flow Air Management Systems (472966) - Manual (Page 13)

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