Draining Of The Oil Extracted From The A/C System; Evacuating And Checking The A/C System For Tightness - Wow Coolius 4000 Bus Instruction Manual

Automatic A/C-Service Unit
The bottle of the recovery unit has a maximum capacity of 40 kg of refrigerant.
If the maximum level is reached during recovery (the alarm message 40.00 appears on the display), the unit will
stop automatically. Transfer the refrigerant from the bottle to a suitable external tank (see procedure at 4.5.2)
When the functions have come to an end, the unit goes back to the summarizing screen. Press any key to
exit and return to the initial screen or press the FEED key to print the report of the function.
6.

Draining of the oil extracted from the A/C system

At the end of RECOVERY, the draining of the oil extracted from the A/C system will automatically be
effected into the graduated bottle 48.
The operator will then have to write down the quantity of drained oil, which must be recharged
afterwards.
Do not pollute environment with oil ; it is a special waste and must be disposed of according to the regulations
in force.
7.

Evacuating and checking the A/C system for tightness

This operation serves to remove any trace of ambient air, water vapour and other possibly contained non
condensable gases from the A/C system, so that it is possible to fill it with refrigerant. A possible
deterioration of the vacuum level after this operation indicates that there are air infiltrations which would
turn into refrigerant leaks after having charged the A/C system.
a) Make sure that all valves on the control panel are closed and that the 67 switch is in position 0
s) Connect the 56 valve of the 53 hose to the A/C system low pressure service connection.
b) Connect the 55 valve of the 52 hose to the A/C system high pressure service connection
c) Turn the 67 switch to position I
d) Press the V key: the set vacuum time will appear on the display (to modify the set values – see 2.10
"Control module")
e) Press the START key to start the vacuum cycle while the display will show:
•
VACUUM TIME
•
REMAINING TIME
f) Check on the display that the remaining time value is not blinking and that the countdown starts
within 5-10 minutes; if this is not the case, stop evacuation and find the leak in the circuit.
g) When the pre-set time is over, the function will stop automatically and the Vacuum test will start for
5 minutes.
h) If the Vacuum Test function ends without having displayed any message, it means that the system
evacuation came to a successful conclusion and the system is ready to perform the charge; on the
contrary if, during the 5 minutes of Vacuum Test the alarm message appears on the display; it
means that there are leaks in the circuit, which must be found and repaired.
When the functions have come to an end, the unit goes back to the summarizing screen. Press any key to exit
and return to the initial screen or press the FEED key to print the report of the function.
Letzte Änderung: 24.06.2009 / Art.Nr.: 2059ENG
WARNING
WARNING
WARNING
WARNING
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