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10. Dial in the Mains voltage using the control knob. Press the knob to enter the value.

11. After a few seconds the dots will stop moving across the screen and DONE will appear on the top right of

thedisplay.DonotshutotheunituntiltheDONEmessageisdisplayedorthenewcalibrationvalueswill

not be stored.

If the message “Mains voltage calibration failed. Please enter the mains voltage again” appears this

indicatesthedialedinlinevoltageis20%dierentthanthemeasuredvalue(notthenominalvalue).

12. Power down the unit and move the calibrate jumper to the NORMAL MODE position. Be sure to orient the

jumper correctly so pins 1-2 and 3-4 are shorted.

System and line voltage calibration are complete.

13. Proceedtohumidiercalibration.

3.4 Line Voltage Calibration

IMPORTANT: Be sure to perform line voltage calibration after replacing a relay board.

1. Hold the override button (>37) while powering up the unit to enter the service screen.

2. On the second service screen select CAL LV.

3. Measure the line voltage at the AC connectors located at the bottom of the electrical enclosure.

4. On the CAL LV screen, dial in the mains voltage value that you measured and push the knob to enter it.

5. When calibration is completed screen will say Mains Voltage Calibration Complete.

If the message “Mains voltage calibration failed. Please enter the mains voltage again” appears this indicates

thedialedinlinevoltageis20%dierentthanthemeasuredvalue(notthenominalvalue).

3.5 Humidier Calibration

IMPORTANT: Besuretore-calibratethehumidierwhenevereitherthesensororthecontrolboardisreplaced.

IMPORTANT: In order for the water in the calibration bottle to be completely saturated, most of the salt should

not be dissolved. There should be as little standing water above the salt line as possible to minimize the

response time. The salt in the calibration bottle may only be used for a period of one year after its initial mix

with water then the kit should be discarded.

Chapter 3: Calibration and Maintenance

GE Giraffe Service Manual

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