Isuzu Trooper 1999 Workshop Manual page 81

f Direct charging with a weight scale charging
station method
1. Make sure the evacuation process is correctly
completed.
2. Connect the center hose of the manifold gauge to the
weight scale.
3. Connect the low pressure charging hose of the
manifold gauge to the low pressure side service valve
of the vehicle.
4. Connect the high pressure charging hose of the
manifold gauge to the high pressure side service
valve of the vehicle.
Legend
(1) Low Side
(2) High Side
(3) Refrigerant Container
(4) Weight Scale
5. Place the refrigerant container(3) up right on a weight
scale(4).
Note the total weight before charging the refrigerant.
a. Open the refrigerant container valve.
b. Open the low side vale on the manifold gauge set.
Refer to the manufacturer's instructions for a
weight scale charging station.
HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–53
6. Perform a system leak test:
7. If no leaks are found, continue charging refrigerant to
1. Run the engine at idle and close all the vehicle
901RS143
2. Turn A/C switch "ON".
3. Set the fan switch to its highest position.
4. Set the air source selector lever to "CIRC".
5. Slowly open the low side valve on the manifold
WARNING: BE ABSOLUTELY SURE NOT TO OPEN
THE HIGH PRESSURE VALVE OF THE MANIFOLD
GAUGE. SHOULD THE HIGH PRESSURE VALVE BE
OPENED, THE HIGH PRESSURE REFRIGERANT
WOULD FLOW BACKWARD, AND THIS MAY CAUSE
THE REFRIGERANT CONTAINER TO BURST.
8. When finished with the refrigerant charging, close the
9. Check for refrigerant leaks.
f Charge the system with approximately 200 g
(0.44 lbs) of HFC-134a.
f Make sure the high pressure valve of the manifold
gauge is closed.
f Check to ensure that the degree of pressure does
not change.
f Check for refrigerant leaks by using a HFC-134a
leak detector.
f If a leak occurs, recover the refrigerant. Repair the
leak and start all over again from the first step of
evacuation.
the air conditioning system.
f Charge the refrigerant until the scale reading
decreases by the amount of the charge specified.
Specified amount: 600 g (1.32 lbs)
f If charging the system becomes difficult:
doors.
gauge set.
low pressure valve of the manifold gauge and
container valve.
901RS144