Robinair 17801B Recovery, Recycling, Recharging Unit - Manual (Page 29)

Model 17800B/17801B Recovery/Recycling/Recharging Unit
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7. If the scale does not read the weight accurately, recalibrate the scale and
UL circuit using the following instructions. If the scale does not respond to
testing, verify the scale cable is plugged into the main circuit board.
8. Press SHIFT/RESET to exit this mode
CALIBRATING THE SCALE
NOTE: The scale assembly and UL circuit MUST be calibrated when installing
a replacement scale assembly or circuit board. To ensure continued charging
accuracy, periodically confirm the checklist below.
1. Remove all weight from the scale platform.
2. Turn on the MAIN POWER switch.
NOTE: If the unit is just being turned on, the screen will default to display the
selected refrigerant type.
3. Press SHIFT/RESET and ENTER until “PROGRAM” displays.
4. When the “PROGRAM” message displays, press SHIFT/ RESET at the
same time. The “FUNC” message displays.
5. Press 9. The display is blank.
6. Press RECOVER and ENTER at the same time.
7. The DATE message flashes, then “0.00” displays. Enter the current month and
year. For example, if the unit is being calibrated on November 8th, 1998, enter
1,1,9,8 and then press ENTER.
8. The “CAL” message will flash, then the “ZERO” message displays.
9. Verify nothing is on or touching the scale platform, then press ENTER.
10. The “CAL” message will flash, then the “A1” message displays.
11. Place a certified weight (between 20 and 70 lbs.) in the center of the scale
platform. Enter the weight from the display. For example, to record 20 lbs.
on the scale, press “ 2,0,0,0” on the keypad, then press ENTER. The display
returns to the vacuum mode.
Maintenance Procedures