© Danfoss A/S (IR/MWA), 02-2010
RI5KC253
→
DKRCI.PI.SC0.C1.53 / 520H4187
3
ENGLISH
Please observe!
If actual refrigerant is different from R 717 (NH
3
),
actual refrigerant must be entered the electronic top
part.
Refrigerant setting
The setting may be carried out before the level transmitter is
mounted on the plant.
1. Push the calibration pushbutton and keep it pressed while
24 V a.c. is connected.
- Now release the switch.
NOTE!
This sequence
must
be observed. If the supply
voltage is connected before the calibration
pushbutton is activated, the signal damping will be
changed.
2. Release the calibration pushbutton. Observe the present
refrigerant setting and measure the 4-20 mA output signal.
1 flash of Green LED - output signal is ~ 5 mA = R717
(factory setting)
2 flashes of Green LED - output signal is ~ 6 mA = R22
3 flashes of Green LED - output signal is ~ 7 mA = R404A
4 flashes of Green LED - output signal is ~ 8 mA = R134a
5 flashes of Green LED - output signal is ~ 9 mA = R744
3. Activate the calibration pushbutton to select required
refrigerant. Each activating will cause AKS 41 / 41U to step to
next refrigerant according to below sequence:
~ 5 mA = R717 (factory setting)
~ 6 mA = R22
~ 7 mA = R404A
~ 8 mA = R134a
~ 9 mA = R744
4. When the current corresponds to the required refrigerant, wait
10 seconds until the green LED is constant ON (not flashing).
This indicates that the required refrigerant has been selected.
5. To leave the setting mode isolate the voltage supply to the
level transmitter.
Go through step 1, 2 and 5 if you wish to control the setting.
Calibration
If operating the liquid level to min. and max. level is possible:
Adjusting the min. /max. calibration points:
Min. calibration:
1. Bring the refrigerant liquid level to desired minimum level.
2. Press the calibration pushbutton and keep it activated in
approx. 5 seconds, until green LED stopps flashing.
3. Activate, within the next 10 seconds, the calibration
pushbutton once (If calibration pushbutton is not activated
within 10 seconds, it will automatically leave calibration
mode and return to normal operation)
Green LED is ON in a few seconds, and then flashing.
Output is now 4 mA and AKS 41 / 41U is in normal operation
The electronic top part must always be calibrated when mounted
on the actual sensor part, if the actual sensor part is not a AKS 41-
15 (1500 mm)
If it is not possible to adjust max. liquid level:
Please note!
The min. level must be calibrated before the max. level.
If the min. level corresponds to AKS 41 being completely
free of the liquid, the standpipe must be drained and
the procedure described above under min. calibration
performed.
Actual liquid level must be determined and the corresponding
mA ouput must be calculated and entered.
Example:
If liquid level cover about 50% of the entire AKS 41 sensor,
then 12 mA output must be entered: [50% of (20-4)] + 4 = 12 mA.
Min. calibration when minimum refrigerant level must be
different from 4 mA:
1. Bring the refrigerant liquid level to desired minimum level.
2. Press the calibration pushbutton and keep it activated in
approx. 5 seconds, until green LED stopps flashing.
3. Activate, within the next 10 seconds, the calibration
pushbutton once and keep it activated. (If calibration
pushbutton is not activated within 10 seconds, it will
automatically leave calibration mode and return to normal
operation)
4. Observe the output mA signal increasing fast starting at 4 mA.
5. Release the calibration pushbutton when the output signal is
approx. 0.5 mA from the desired point.
6. All the next activations will increase the output signal by
approx. 0.05 mA
7. Approx. 10 seconds after the latest activation the LED starts
flashing
8. Output now corresponds to the value measured at the
latest activation.
Max. calibration:
1. Bring the refrigerant liquid level to desired maximum level.
2. Press the calibration pushbutton and keep it activated in
approx. 5 seconds, until green LED stopps flashing.
3. Activate, within the next 10 seconds, the calibration push-
button two times, with 1 second in between. (If calibration
pushbutton is not activated within 10 seconds, it will
automatic leave calibration mode and return to normal
operation)
Green LED is ON in a few seconds, and then flashing.
Output is now 20 mA and AKS 41 / 41U is in normal operation
50%
