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34800/34801 Service ManualORIGINAL 5/99
and Recalibration for AC900
1.Turn on the MAIN POWER switch.
highlighted on the screen.
highlighted, press the MODE and ENTER keys
4.Remove all weight from both scale platforms.
5.Using the UP and DOWN keys, toggle the display to
6.Press the ENTER key to turn the scale into a direct
NOTE: Whatever weight is on the scale when ENTER is
pressed will not be shown on the display. Be pressing
ENTER, the unit automatically zeros the weight on the
scale of the selected regfrigerant type. If you remove the
weight, the display shows the change in total weight, but
does not show a negative sign. The refrigerant selector
switch may be changed during the procedure to check
If the scales does not react to testing, verify that the scales
RECALIBRATING THE SCALES
2.Turn on the main power switch.
NOTE: If the unit is just being turned on, the screen
defaults to display the selected refrigerant type. Press
3.Press the MODE and ENTER keys simultaneously to
DOWN keys to toggle the display to F09.
5.Press the RECOVER and VAC/RECYCLE keys
shows 0.00.
month and year. For example, if the unit is being
calibrated in August of 1999, enter 0-8-9-9. Press
7.The display flashes r12, then displays ZEro (zero).
8.Make sure nothing is on or touching the R-12 scale
9.The display flashes A1, then displays 0.00.
10.Place a certified weight, between 10 and 40 lbs., in
the center of the scale platform. Using the UP and
Press ENTER.
11.The display flashes “134A” then displays “ZEro”
12.The display flashes “A1” then read “0.00”.
13.Place a certified weight, between 10 and 40 pounds,
in the center of the scale platform. Using the UP and
then press ENTER. The display then shows the
14.Check the scale accuracy.
1.Remove all weight from the scale platforms.
NOTE: If the unit is just being turned on, the screen will
default to display the selected refrigerant type. Press
3.Press the MODE and ENTER keys simultaneously to
to toggle the display to “F02”.
4.Press the ENTER key. The screen will display “000”.
NOTE: The zero on the left of the display is for R-12,
and the zero on the right of the display is for R-134A.
Since the AC900 uses two 30 lb. tanks, the full limit
5.Place a known weight of 43 lbs. on the R-12 scale.
The zero on the left of the display should change to a
point, adjust the R-12 P-1 pot so the full limit is set at
43 lbs. Turning the P-1 pot clockwise will decrease
the amount of weight you can put on the scale before
limit has been reached. Turning the P-1 pot
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counterclockwise will increase the amount of weight
allowed before the zero changes to a “1” indicating
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6.Repeat step 5 on the 134A scale.
NOTE: The zero on the right of the display indicates the
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134A full limit. Once the 134A full limit is reached, the