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Maintenance Instructions There are just a few routine maintenance procedures necessary to keep your unit operating properly. CHECKING THE SCALE ACCURACY To ensure continued charging accuracy, check your scale using these procedures every thirty (30) days or 100 service jobs, whichever comes first. Also if the microprocessor senses that calibration has been lost, the "CAL" message displays. Follow this procedure to check the scale accuracy: 1. While in the PROGRAM mode, press SHIFT/RESET and ENTER at the same time to enter the diagnostic mode and clear the digital display. 2. Press 6 to display the approximate scale platform weight. 3. Remove the tank from the scale platform. The empty platform weight displayed should be zero. (± 2 pounds or ±1 kilogram) • If the displayed weight is not within these limits, the CHECK REFRIGERANT message will also display. Call the manufacturer. • If the display does not show the correct weight with ±.1 lb., see "Calibrating the Scale " section. 4. If the calibration is correct, press SHIFT/RESET to exit. SHIFT/RESET ENTER INST0474 Diagram of Control Panel Series 17700A/17701A/34700/34701/34704 Enviro-Charge Units 27
Maintenance Instructions CALIBRATING THE SCALE IMPORTANT! You must have a known exact weight of 40 lbs. ± .01 (18.14 kg ± .005) 1. Remove all weight from the scale platform. 2. Turn on the MAIN POWER switch. 3. Press SHIFT/RESET and ENTER at the same time. 4. Press 8-7-8-7. The display will show "A-1." NOTE: If you press any other key before the 8-7-8-7 sequence, you will not be able to enter the automatic calibration routine. 5. Press 0 and then ENTER. The display will show "0.00" and then change to the A-2" message. 6. Place a known exact weight of 10-60 lbs. on the center of the platform. Enter that weight on the display using the keypad, then press ENTER. The display will return to the vacuum mode. 7. Check the scale accuracy by pressing SHIFT/RESET and ENTER and the same time. When the diagnostics mode is entered (the display is blank) press 6. The display shows the amount of weight on the scale platform, and 0.00 when it is removed. 28 © 1998 Robinair, SPX Corporation
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Page 3 and 4: CONVERSION TABLE OZ. LBS. 0.5 0.03
Page 5 and 6: Introduction This manual contains i
Page 7 and 8: Set Up Instructions Low Side Gauge
Page 9 and 10: Set Up Instructions 9. While the pu
Page 11 and 12: Set Up Instructions IMPORTANT! The
Page 13 and 14: Operating Guidelines USING THE CONT
Page 15 and 16: Operating Guidelines Segment A —
Page 17 and 18: Overview This overview is designed
Page 19 and 20: Operating Instructions OPERATING TI
Page 21 and 22: Operating Instructions IMPORTANT! R
Page 23 and 24: Operating Instructions CAUTION! Dra
Page 25 and 26: Operating Instructions Option A You
Page 27 and 28: Operating Instructions IMPORTANT! Y
Page 29: Operating Instructions CORRECTING A
Page 33 and 34: Maintenance Instructions UL CIRUIT
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Page 37 and 38: Maintenance Instructions Diagram of
Page 39 and 40: Troubleshooting Tips RECOVERY OPERA
Page 41 and 42: Troubleshooting Tips ERROR/MESSAGE
Page 43 and 44: Replacement Parts List Series Serie
Page 45 and 46: Wiring Diagram J4 1 2 3 4 5 6 J3 1

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