Gage Calibration

GAGE CALIBRATION
Prior to evacuation, check the low pressure gage for proper calibration and determine if vacuum system is operating properly.

With the gage disconnected from the refrigeration system, be sure that the pointer indicates to the center of "0". Lightly tap gage a few times to be sure pointer is not sticking. If necessary, calibrate as follows:
1. Remove cover from gage.
2. Holding gage pointer adjusting screw firmly with one hand, carefully force pointer in the proper direction to position pointer at the "0" position. Tap gage a few times to be sure pointer is not sticking. Replace gage cover.