Suzuki GRAND VITARA JB416, Service Manual

Page: 382 / 474

7B-6 Air Conditioning System:
Recovery
When discharging refrigerant out of A/C system, always
recover it by using refrigerant recovery and recycling
equipment (1). Discharging refrigerant HFC-134a
(R134a) into atmosphere would cause adverse effect to
environments.
NOTE
• After recovering refrigerant from system
the amount of removed compressor oil
must be measured for replenishing
compressor oil. Refer to “Precautions on
Replenishing Compressor Oil: in related
manual”.
• When handling recovery and recycling
equipment, be sure to follow the
instruction manual for the equipment.
Evacuation
CAUTION
!
Do not evacuate before recovering
refrigerant in system.
NOTE
Once A/C system circuit is opened (exposed
to atmospheric air) air conditioning system
must be evacuated by using a vacuum pump.
The A/C system should be attached with a
manifold gauge set, and should be evacuated
for approx. 20 minutes.
1) Connect high charging hose (1) and low charging
hose (2) of manifold gauge set (3) respectively as
follows:
High charging hose (1)
→
High pressure charging
valve (4) on discharge hose
Low charging hose (2)
→
Low pressure charging
valve (5) on suction pipe
2) Attach center charging hose (6) of manifold gauge
set (3) to vacuum pump (7).
3) Operate vacuum pump (7), and then open
discharge-side valve (9) (Hi) of manifold gauge set
(3).
If there is no blockage in the system, there will be an
indication on high pressure gauge (10).
In this case, open the other-side valve (8) (Lo) of the
set and repair the system.
4) Approx. 10 minutes later, low pressure gauge (11)
should show a vacuum lower than –100 kPa (–1.0
kg/cm
2
, –760 mmHg, –14.2 psi) providing no
leakage exists.
NOTE
• If the system does not show a vacuum
below –100 kPa (–1.0 kg/cm
2
, –760 mmHg,
–14.2 psi), close both valves, stop vacuum
pump and watch movement of low
pressure gauge.
• Increase in the gauge reading suggests
existence of leakage. In this case, repair
the system before continuing its
evacuation.
• If the gauge shows a stable reading
(suggesting no leakage), continue
evacuation.
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