Greenheck Vari-Green Control - Constant Pressure Outdoor ( 472864) - Manual (Page 5)

5 Vari-Green Constant Pressure Controls
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points above the value you noted in the previous
step. Refer to page 4 for a graphical representation.
When the system is running and the output percent has
dropped below the cutout value, the “L” icon will appear
on the display. This shows that the delay timer has
started and after the set time, the fan will turn off. When
the fan turns off, an icon will blink on the display.
One of two things must happen for the system to return
to normal operating mode:
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etc. is turned on and will vary the exhaust fan speed
appropriately.
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awakened from cutout mode, hold the Clear button
for 2 seconds and the system will return to normal
operating mode.
Delay
The default is 60 seconds. If a different delay duration is
required, change this value before the fan is shut off.
Programming of the controller is now complete. If power
to the controller is lost, all settings will be retained.
No further attention to the settings is necessary other
than set point adjustments. Remember, a set point
change will require an adjustment of the cutout value if
applicable.
Remote Override
When the remote override is activated, the fan will
immediately ramp to 100% speed and stay there until
it is disabled. The override can be activated by any
normally-open voltage-free contact. Closing the contact
will activate the override.
The display screen will turn red and scroll “Override”
when it is activated.
PROBLEM CORRECTIVE ACTION
Controller will
not shut fan off.
Verify that the cutout value is correct
and that the timer has started by
looking for the “L” icon on the
display. If this icon is not displayed,
then the cutout value needs to be
adjusted. Remember that this value
should be set when there is no
demand on the system.
Controller shuts
fan off when
there is demand
on the system.
The cutout value is set too high.
Lower the value and observe the
operation of the system.
Troubleshooting
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is not capable of operation during repairs.
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