GEA Omni, Instruction Manual

Page: 230 / 238

5.3.3 Calibration for Capacity Slide for Step Variable Vi Compressors
The calibration process for the capacity slide of a step variable Vi compressor package depends on the type of
compressor in use. The three types of compressors which may utilize step Variable Vi are Frick, Mycom and HE.
Touching the cell associated with the measured value of the capacity slide position on a step variable Vi com-
pressor will bring up the calibration display shown below.
fig.118: Capacity Slide Calibration Pad (Step Variable Vi)
1. Ensure that the control panel is in
Service Mode and the compressor is Stopped .
2. Verify that the compressor is physically fully unloaded. The GEA Omni™ will only allow the compressor to
start if it has a slide valve reading less than the value of the Maximum Capacity to Allow Start parameter.
3. START the Compressor.
4. Touch the
LOW button to force the Vi setting of the compressor to its low level. The bar on the right edge of
the button will illuminate green to indicate that the Vi Setting is at its low.
5. Touch the UNLOAD button. Wait until the slide valve reaches the fully unloaded position. The Capacity Slide
Voltage should stabilize at approximately 1 V when the compressor is fully unloaded.
6. Touch the
Save Low Offset button. The corresponding slide valve position sensor output has been recorded
as the fully unloaded position.
7. Touch the LOAD button. Wait until the slide valve reaches the fully loaded position. The Slide Position Indi-
cator should stabilize at approximately 5 V when the compressor is fully loaded.
8. Touch the
Save High Offset button, the corresponding slide valve position sensor output has been recorded
as the fully loaded position.
9. Touch the UNLOAD button again. The compressor should fully unload and the indicated Capacity Slide
Position should track with it. Touch the LOAD button to fully load the compressor and observe the Capacity
Slide Position .
10. If the Capacity Slide Position appears to track the Capacity Slide Voltage , the calibration is complete.
11. Otherwise, repeat the procedure. Ensure that the Slide Position Indicator reading changes smoothly
between full unload and full load.
12. Touch the
Medium button to force the compressor Vi setting to Medium.
13. Repeat Steps 5 through 11.
14. Touch the High button to force the compressor Vi setting to High.
15. Repeat Steps 5 through 11.
16. The compressor may be taken out of Service mode and stopped if desired.
Sensor Calibration
Capacity Slide Position Calibration Instruction Manual | GEA Omni™
Control panel
230 GEA Refrigeration North America, Inc. | E_806550_2 | Generated 12.01.2016