Case 580SR Service Manual page 802

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LEAK TESTING, DISCHARGING AND CHARGING THE AIR CONDITIONING SYSTEM
Leak Testing
To perform a leak test if refrigerant leakage is sus-
pected, use a leak detector following the manufac-
turer's instructions.
Leak detectors use light or sound dependent upon
the type used to alert the operator of a leak. If the
leak detector's sensitivity is adjustable, be sure you
calibrate the detector according to the manufactur-
er's instructions before use.
When using a leak detector, keep in mind that a very
slight amount of leakage in the compressor pulley
area is normal and does not necessarily indicate a
repair is required.
When a leak is located, follow these steps.
Z Discharge the system using a certified refrigerant
recovery system.
Z Repair the leak.
Z Evacuate the system.
Z Partially charge the system with 400 g of refriger-
ant.
Z Check system for leaks.
Z Fully charge the system.
Always check the system for leaks as a final test af-
ter evacuating and before recharging. Refer to
"Evacuating the system".
Discharging the system
Legislation has been introduced banning the release
of refrigerant into the atmosphere.
Whenever overhauling the air conditioning system
or performing other tasks which require the air con-
ditioning system to be dismantled it is necessary to
discharge the refrigerant gas before commencing
repair.
Before you can dismantle an air conditioning system
for repairs, you must discharge and recover the re-
frigerant using a certified recovery unit in accord-
ance with the manufacturer's instructions.
Shown is a combined refrigerant recovery, evacua-
tion and recycling/charging station. This equipment
removes HFC 134a refrigerant from the air condi-
tioning system, recycles and recharges all in one
hook up.
The unit is designed to be used with the manifold
gauge set built into the control panel.
SECTION 50 - CAB HEATING AND AIR CONDITIONING
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