Johnson Controls SABROE Unisab III Control User Manual

Make sure that the capacity slide is in minimum. Adjust the minimum position on the trans-
mitter. Now bring the capacity slide to its maximum position (i.e. when the current consump-
tion is no longer rising) and adjust the maximum position on the transmitter. Return the slide
to minimum and check. Afterwards, remember to reset Setpoint 1 to 0.0%.
7.5.5 Volume ratio slide adjustment, auto Vi
It is assumed that the capacity slide transmitter has been adjusted correctly. Start the com-
pressor in Manual and move the capacity slide up to 20-30%. Select Control values/
Capacity/Vi slide position/Control and the following picture will appear:
In this picture Setpoint 1 = 0.0% always means that the Vi slide will be adjusted by Unisab III
automatically. Change Setpoint 1 to -10% which changes the Vi adjustment to manual and
places the Vi slide in minimum position.
Adjust the minimum position on the Vi slide position transmitter. Change Setpoint 1 to 110%
and watch the Vi position which is now going to rise to the maximum position.
Wait until it does not rise any further and adjust the maximum position on the transmitter.
Change Setpoint 1 to -10% and check minimum. Change Setpoint 1 to 0.0% for automatic Vi
control.
Calibration
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Engineering manual - Unisab III 1.10
001930 en 2014.09

Johnson Controls SABROE Unisab III Control Specifications

General

Brand	Johnson Controls
Model	SABROE Unisab III Control
Category	Control Systems
Language	English