Matco Tools AC442 - Maintenance Procedures; Maintenance Intervals and Cylinder Filling

Maintenance
| AC442
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10 Maintenance
Please contact an authorized technical service
center for purchasing factory replacement parts.
10.1 Maintenance interval
Make sure AC442 is disconnected from power before
removing plastic housing.
Never perform any maintenance work which is not
expressly
recommended in this Section.
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 s croll to MAINTENANCE and then select.
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.
The refrigerant can be obtained from your gas supplier. It
can be stored normally and transported in bottles with
connection fittings
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.
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 and begin process. or the X to cancel
adjustment.
4. Follow the menu prompting.
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.
Description Period
Calibration of scales 1x per year to ensure accuracy
Vacuum pump oil replacement and
system leak test
After 1000 hours of service
Combo filter replacement and system
leak test
After 75kg of refrigerant
processed
System leak test As required