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10 Maintenance
Please contact an authorized technical service
center for purchasing factory replacement parts.
10.1
Maintenance interval
Description
Calibration of scales
Vacuum pump oil replacement and
system leak test
Combo filter replacement and system
leak test
System leak test
m
Make sure AC442 is disconnected from power before
removing plastic housing.
Never perform any maintenance work which is not
expressly recommended in this Section.
m
Contact customer service if components have to be
replaced other than in the course of maintenance work.
To access MAINTENANCE from the MAIN MENU, press
and
scroll to MAINTENANCE and then select.
1901016-85
Period
1x per year to ensure accuracy
After 1000 hours of service
After 75kg of refrigerant
processed
As required
Fig. 25: Maintenance screens
10.2 Filling internal refrigerant cylinder
Warning - Risk of frostbite from
escaping refrigerant
Refrigerant causes severe frostbite on the
skin.
Check the service hoses for damage.
Firmly connect the service quick-release
couplings to the service hoses.
Wear protective goggles.
Wear protective gloves.
Before the AC442 can be used, the internal
refrigerant cylinder must be filled with liquid
refrigerant. Use only R134a refrigerant.
t
The refrigerant can be obtained from your gas supplier. It
can be stored normally and transported in bottles with
connection fittings
t
To ensure a reliable procedure, it is advisable to use
the optimum quantity of refrigerant. The optimum
quantity of refrigerant for the AC442 is 4kg – 10.0kg.
An inadequate quantity of refrigerant may make
effectiveness of filling the vehicle air conditioning
system impossible. Also, if there is an insufficient
quantity, the AC442 may not be able to operate
efficiently. In the event of an excessive quantity, there
may not be space for the refrigerant recovered from
the vehicle air conditioning system.
m
Do not open coupler until unit prompts technician to open.
1. From the MAINTENANCE menu, scroll until
INTERNAL BOTTLE FILL is highlighted and press.
2. To adjust the charge amount, highlight the value and press to
adjust the value higher or lower.
3.
Press the
to accept
adjustment.
4. Follow the menu prompting.
t
The current pressure inside the external refrigerant
bottle is indicated on the low-pressure gauge.
Do not interrupt the automatic filling process prior to
automatic termination by the AC442.
Maintenance | AC442 | 22 en
and begin process.
or the X to cancel
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