1. Using the menu select arrow keys, navigate to
Inlet→Inlet Reset
.
2. Set the following parameters:
Inlet reset mode
Select the desired reset mode: “Op/Cl” to reset the actuator toward
its nearest position; select
Close
to reset the actuator toward its
closed position only or select
Off
to disable the automatic reset.
Inlet reset now?
Select
Yes
to reset the actuator’s position now.
Day time
Set the time at which resets are performed.
Period
Enter the frequency of inlet resets. A reset can be performed once
every 1-7 days.
Reset delay
During a reset, the controller opens or closes the inlet during this
delay, or up until a limit switch is reached. The reset delay should be
set to the same time value or higher than the total opening time (as
defined in previous section).
Disable if Out.T° is Below
To prevent the inlet from closing against ice, the controller can stop
all inlet resets when it is too cold outside. Set the outside tempera-
ture below which inlet resets are forbidden (this includes manual
resets). *This parameter is accessible if an outside temperature
sensor is enabled
Actuator Reset: How it Works
Resetting the actuator’s position is used to clear accumulated time offsets caused by the frequent open-
ings and closings of the inlet. The controller resets the actuator’s position at regular intervals to make
sure the inlet position is always accurate.
NOTE:
No reset can be made when the outside temperature falls to a user-defined value. This applies to
automatic & manual resets.
This reset is performed automatically according to one of these two methods:
Reset the minimum position only (Close mode)
Each time a reset is performed, the inlet totally closes. Once the actuator’s position is reset, the inlet
returns to its previous position. The “Close” pilot light of the inlet flashes while the controller closes the
inlet.
Reset toward the nearest position (Open/Close mode)
If the current inlet position is higher than 50% at the reset time, the controller fully opens the inlet to reset
the actuator’s position; if the current inlet position is lower than 50%, the controller closes the inlet to per-
form the reset. This way, the inlet never closes when the room temperature already asks for a wide open-
ing. The “Open” or “Close” pilot light of the inlet flashes while the controller moves the inlet.
There must be limit switches located at both ends of the actuator when using this resetting method.
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890-00081
Expert VT-110
Summary of Contents for Expert VT-110
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