Protec AC-200A, Manual, Page: 11 / 15

AC-200A A/C System Maintenance Centre
8
10) Usage of the Auxiliary Port
A
、
Leak checking by N2
i. Remove the cap of auxiliary port after the equipment stop working entirely.
ii. Connect the N
2
to the auxiliary port.
Note: the connector to the auxiliary port must be with thimble. Do not open the valve
of N
2
during this process.
iii. Adjust the N
2
pressure to a suitable value and open the valve of N
2
. When the pressure is
stable, please close the valve of N
2
. Normally, the pressure is adjusted to about 12~15bar.
iv. Check if there has any leakage in the A/C system. After checking, please press the needle in
the auxiliary port to relive the N
2
.
v. After finished, re-back the cap to the auxiliary port.
B
、
Recharging from cans
i. Before vacuum, connect the pipe with the external tank to the auxiliary port.
Note: the connector to the auxiliary port must be with thimble. Do not open the valve
of external tank during this process.
ii. Run vacuum function.
iii. Open the valve of external tank to recharge the right amount refrigerant into A/C system.
And then close the valve of external tank.
iv. After finished, disconnect the pipes and re-back the cap to the auxiliary port.
11) Maintenance
A
、
Calibration of load cell
When the load cell is not precise
,
it needs to be calibrated.
Calibrating procedure as below:
i. Prepare a 15 kg weight. And remove the refrigerant tank from scale pan and keep the
pan empty.
Note: do not disconnect the red and blue hose from the refrigerant tank. It’s better
put the refrigerant tank on a lower stage
.
ii. Press and hold “STOP” key then power on the equipment. Press”+”or ”-” to select the
load cell of cleaning tank (internal tank, SEN1) or of the recharging tank (external tank,
SEN2). Press “ENTER” key to the calibration process.
iii. The LED displays “1” in flushing.
iv. Press "ENTER" key to do the empty plan calibration. Then the LED will display “2” in
flushing.
Note: If LED shows “ERR1”
，
please refer to the APPENDIX: ALARM CODE
TABLE .
v. Put the 15 kg weight onto the scale pan and press “ENTER” key. Then LED displays the
weight value and adjusts the value to 15 by press “+” or “-”key.
Note: if the weight is 20kg, the value must be set to 20.
vi. Press “ENTER” key to do the scale linear calibration. Then the LED displays “END” to
mean it’s successful for the calibration.
Note: if LED shows “ERR2”, please refer to the APPENDIX: ALARM CODE TABLE.