Saab 900 Service Manual page 52

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Warning
Saab900
Open flames must never be brought in the
vicinity of the refrigerant cylinder. The
electric heater on the measuring cylinder
must be switched off' throughout the
charging process.
Close valve G on the vacuum pump and valve B.
If the measuring cylinder is tightly sealed, charg-
ing of the measuring cylinder may be started.
Close valve A (to isolate the circuit from the vac-
uum pump). The reading on the vacuum gauge
should not rise.
To check that the measuring cylinder is
tightly sealed
After the pump has been running for about a
minute, close the ballast valve. Let the vacuum
pump continue to run for a further five minutes.
Check the vacuum by slowly opening valve G.
Note the reading on the gauge. The reading
should be below 10 mbar.
Open the valve on the refrigerant cylinder to
charge the measuring cylinder. Do not fill above
the mark - maximum charge 2250 g. The charg-
ing process can be speeded up by heating the re-
frigerant cylinder with warm air or the like.
854-40 Heating and ventilation system, air conditioning system