Greenheck Vari-Flow Air Management System(476251) - Manual (Page 30)

30 Vari-Flow Air Management System
Troubleshooting
Issue Possible Cause Recommended Solution
Smoke spilling out
of hood at 100%
operation
Max fan speed has been scaled
down from 100%
Increase exhaust fan maximum speed to 100%.
Improper hood design
Check hood overhang, cross drafts, or proper make
up air
Smoke spilling out
when hood running at
lowest speed Fan minimum speed set too low Increase exhaust fan minimum speeds
Improper hood design
Check hood overhang, cross drafts and proper
make up air
Fans do not turn up to
maximum speed
Dirty temperature sensor Clean grease from temperature sensor
High temperature set
too high Decrease the high temperature set point
(115°F default)
Fans do not turn down
to minimum speed
Dirty temperature sensor Clean grease from temperature sensor
Low temperature set
too low Increase the low temperature set point
(90°F default)
Exhaust fan on and
supply fan off Broken supply fan belt Replace fan belt
Fire mode Check fire contact connection
Fans rotate in wrong
direction
VFD output wiring incorrect
Switch any two leads on the hood side of the
VFD to the fan motor
100% override does
not increase exhaust
speed
Exhaust already at 100% Proper Operation
Fan button on, but fans
do not turn on Broken fan belt Replace fan belt
VFD fault Check VFD for faults
Hood light(s) button
on, but actual lights
are not on Light bulbs are burned out Replace hood light bulbs
Bad wiring connection
Verify lights are wired to correct terminals. Refer to
Lights wiring section.
The fan button is off,
but the fans will not
turn off
Vari-Flow is operating in
temperature interlock mode.
Temperature Interlock indicator on
keypad/touchscreen will be on. The temperature in the hood is still above
the temperature interlock off setpoint. It will
automatically turn off once below the setpoint and
the off delay time.
Fans do not turn on
automatically
Temperature Interlock Enabled; set
to no Enable the temperature interlock option. (Default is
enabled)
Interlock set point too high Decrease the temperature interlock on setpoint.
Pressure Sensor Fault
Kinked hose Remove kink or replace hose
Controlled space not holding
pressure
Adjust the static pressure set point
Fire
Fire system microswitch is in the
fire position
Check the fire suppression microswitch connections
Temperature Sensor
Fault Dirty/burned sensor Clean/replace sensor
Incorrect programming Check the temperature sensor settings
Exhaust VFD Fault
VFD over current Check fan rotation
Look at drive for fault identification.
Refer to Yaskawa Quick Start
Guide for fault.
Check the VFD overload settings (PAR E2-01)
Supply VFD Fault
VFD over current Check fan rotation
Look at drive for fault identification.
Refer to Yaskawa Quick Start
Guide for fault.
Check the VFD overload settings (PAR E2-01)
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