Evacuating - Suzuki sq-416-420-625 Service Manual

For CAMI production vehicle
For IWATA production vehicle

EVACUATING

EVACUATING PROCEDURE
CAUTION:
Do not evacuate before recovering refrigerant in system.
NOTE:
Whenever opened (exposed to atmospheric air), air condition-
ing 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. 15 minutes.
1) Connect high charging hose (1) and low charging hose (2) of
manifold gauge set (3) respectively as follows:
High Charging Hose (1)
Low Charging Hose
2) Attach center charging hose (6) of manifold gauge set (3) to vac-
uum 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).
When this occurs, open the other-side valve (8) (Lo) of the set.
4) Approx. 10 minutes later, low pressure gauge (11) should show
a vacuum lower than –760 mmHg providing no leakage exists.
NOTE:
D If the system does not show a vacuum below –760 mmHg,
close both valves, stop vacuum pump and watch move-
ment of low pressure gauge.
D Increase in the gauge reading suggests existence of leak-
age. In this case, repair the system before continuing its
evacuation.
D If the gauge shows a stable reading (suggesting no leak-
age), continue evacuation.
5) Evacuation should be carried out for a total of at least 15 minutes.
6) Continue evacuation until low pressure gauge indicates a vacu-
um less than –760 mmHg, and then close both valves (8), (9).
7) Stop vacuum pump (7). Disconnect center charging hose (6) from
pump inlet. Now, the system is ready for charging refrigerant.
CHECKING SYSTEM FOR PRESSURE LEAKS
After completing the evacuation, close manifold gauge high pres-
sure valve (HI) and low-pressure valve (LO) and wait 10 minutes.
Verify that low-pressure gauge reading has not changed.
CAUTION:
If the gauge reading moves closer to "0", there is a leak
somewhere. Inspect the tubing connections, make neces-
sary corrections, and evacuate system once again, making
sure that there are no leaks.
AIR CONDITIONING (OPTIONAL) 1B-25
High pressure charging valve (4)
on Discharge Hose
(2)i Low pressure charging valve (5)
on Suction Pipe