Section 260-0130
SM 1966 4-00
9
Operators Compartment - Air Conditioning
DISCHARGING THE SYSTEM
Note: Refer to all WARNINGS listed under
'Maintenance' prior to discharging the system.
Recommended Equipment Required:
Portable High Vacuum Charging Station
Suitable Canister
or Standard Service Manifold (Refer to Fig. 4)
To eliminate system contaminants from an air
conditioning system requires discharging the entire
system. This means removing all of the refrigerant
and cleansing all contamination (air and moisture)
from the system components. If any of the major
system components are to be repaired or replaced,
the system must also be completely discharged.
WARNING
The vehicle must not be running during this
procedure. Be sure to have adequate
ventilation during this operation. Do not
discharge refrigerant near an open flame.
Numbers and letters in parentheses refer to Fig. 4.
1. Position the vehicle in a level work area, apply the
parking brake and switch off the engine.
2. Block all road wheels and place the battery master
switch in the 'Off' position.
3. Pull on handle to release hood catch and raise the
hood.
4. Connect the service hose (yellow) to the centre
access port on the manifold gauge and to the vacuum
connection (6) on vacuum pump. Ensure that the
system is empty before connecting the vacuum so
that refrigerant does not enter the pump.
5. Tighten down (turn clockwise) both high and low
side valves on the gauge manifold to the closed
position. Remove protective caps from the service
ports on the compressor.
6. Connect both service hoses from the two fittings (2
& 3) in the bottom of the manifold to the two service
ports on the compressor. High side (red) to
compressor discharge valve, low side (blue) to
compressor suction valve.
7. Switch vacuum pump on, open vacuum pressure
valve (1) until less than 6 mb is reached on vacuum
gauge (A). The vacuum gauge (A) should remain at
this value when vacuum pressure valve (1) is closed
to indicate that there are no leaks.
8. Open the low side hand valve on the manifold and
vacuum pressure valve (1) and watch that the
gauges start to register that a vacuum is being
drawn. If the gauges do not register the vacuum
thena blockage is present. Open the high side and
pump down until a vacuum of 10 mb is achieved.
9. After 10 - 15 minutes close vacuum pressure valve
(1) and allow the system to settle, vacuum gauge (A)
should not alter. If the vacuum is held, no leaks or
refrigerant contaminated oil is present. If not, open
the vacuum pressure valve (1) and continue
pumping, checking at regular intervals. If there is a
leak, check all fittings and tighten if necessary.
10. Tighten down (turn clockwise) both high and low
side valves on the gauge manifold to the closed
position, remove the service hose (yellow) from the
vacuum connection (6) on vacuum pump and switch
the pump 'Off'.
Gauges:
A - Vacuum Gauge
B - Low Pressure Gauge
C - High Pressure Gauge
D - Charging Cylinder
Pressure Gauge
Valves:
1 - Vacuum Pressure
2 - Suction Line
3 - Discharge Line
4 - Refrigerant Gas
5 - Refrigerant Liquid
Port:
6 - Vacuum Connection
Fig. 4 - Standard Service Manifold
B
C
D
A
VACUUM PUMP
SUC
DIS
ACCESS
PORT
2
3
4
5
6
1
R
E
F
R
I
G
E
R
A
N
T
SM - 2424
Содержание TA30
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