Range Rover. Manual — part 294
AIR CONDITIONING
5
ADJUSTMENT
LEAK TEST SYSTEM
The following instructions refer to an electronic type
Refrigerant Leak Detector for use with R134a, which
is the safest and most sensitive.
CAUTION: When a major repair has been
carried out, a leak test should be carried
out using an inert gas (see below).
1. Place the vehicle in a well ventilated area but
free from draughts, as leakage from the system
could be dissipated without detection.
2. Follow the instructions issued by the
manufacturer of the particular leak detector
being used.
3. Commence searching for leaks by passing the
detector probe around all joints and components,
refrigerant gas is heavier than air.
4. Insert the probe into an air outlet of the
evaporator or into the evaporator drain tube.
Switch the air conditioning blower on and off at
intervals of ten seconds. Any leaking refrigerant
will be gathered in by the blower and detected.
5. Insert the probe between the magnetic clutch
and compressor to check the shaft seal for
leaks.
6. Check all service valve connections, valve plate,
head and base plate joints and back seal plate.
7. Check the condenser for leaks at the pipe
unions.
8. If any leaks are found, the system must be
discharged before rectification.
9. Rectify any leaks and recheck for leaks during
evacuation prior to charging.
Leak test using inert gas
Use Nitrogen or Helium gas.
1. Connect gas line to recharging station.
2. Pressurise system to 3 bar.
3. Carry out leak test as above.
82
AIR CONDITIONING
NEW RANGE ROVER
6
ADJUSTMENT
AIR CONDITIONING SYSTEM - PERFORMANCE
TEST
WARNING: R134a is hazardous.
See this
section.
Carry out this test with bonnet and doors or windows
open, air conditioning switched on, temperature
control set to cold and blower at maximum speed. Set
the air supply control to supply fresh air.
1. Close low pressure valve on refrigerant station.
2. Close high pressure valve on refrigerant station.
3. Connect a Refrigerant Station to the high and
low pressure servicing connections.
4. Insert dry bulb thermometer into cold air outlet
and position dry and wet bulb thermometer close
to outside air inlet.
Do not spill water from the wet thermometer
(psychrometer).
5. Start engine and run it at 1500 rev/min for 10
minutes with air conditioning switched on.
6. Read both pressure gauges and thermometers.
Check readings against table below with
humidity between 60% and 80%. If readings are
incorrect.
See Fault diagnosis.
7. Switch off air conditioning, stop engine,
disconnect test equipment.
Performance range
Intake temperature
Outlet temperature
Low pressure
High pressure
20 - 24
°
C
4 - 10
°
C
18 - 28 lbf/in
2
213 - 299 lbf/in
2
1.2 - 1.9 bar
14.7 - 20.6 bar
25 - 29
°
C
9 - 19
°
C
27 - 37 lbf/in
2
256 - 341 lbf/in
2
1.9 - 2.6 bar
17.6 - 23.5 bar
30 - 35
°
C
20 - 27
°
C
33 - 47 lbf/in
2
299 - 384 lbf/in
2
2.3 - 3.2 bar
20.6 - 26.5 bar
Table 1
Ambient
Compound Gauge
High Pressure
Temperature
Readings
Gauge Readings
°
C
°
F
bar
lbf/in
2
bar
lbf/in
2
16
60
1,03-1,4
15-20
6,9-10,3
100-150
26,7
80
1,4-1,72
20-25
9,6-13,1
140-190
38
100
1,72-2,1
25-30
12,4-15,5
180-225
43,5
110
2,1-2,4
30-35
14,8-17,2
215-250
AIR CONDITIONING
7
ADJUSTMENT
SYSTEM TEST
1. Place the vehicle in a ventilated, shaded area
free from excessive draught, with the doors and
windows open.
2. Check that the surface of the condenser is not
restricted with dirt, leaves, flies, etc. Do not
neglect to check the surface between the
condenser and the radiator. Clean as necessary.
3. Switch on the ignition and the air conditioner air
flow control. Check that the blower is operating
efficiently at low, medium and high speeds.
Switch off the blower and the ignition.
4. Check that the evaporator condensate drain
tubes are open and clear.
5. Check the tension of the compressor driving belt,
and adjust if necessary.
6. Inspect all connections for the presence of
refrigerant oil. If oil is evident, check for leaks,
and repair as necessary.
NOTE: The compressor oil is soluble in
Refrigerant R134a and is deposited when
the refrigerant evaporates from a leak.
7. Start the engine.
8. Set the temperature controls to cold and switch
the air conditioner blower control on and off
several times, checking that the magnetic clutch
on the compressor engages and releases each
time.
9. With the temperature control at maximum
cooling and the blower control at high speed,
warm up the engine and fast idle at 1000
rev/min.
10. Repeat at 1800 rev/min.
11. Gradually increase the engine speed.
12. Check for frosting on the service valves.
13. Check the high pressure hoses and connections
by hand for varying temperature. Low
temperature indicates a restriction or blockage at
that point.
14. Switch off the air conditioning blower and stop
the engine.
15. If the air conditioning equipment is still not
satisfactory, carry out a pressure test as
previously described in this section.
PRECAUTIONS IN HANDLING REFRIGERANT
LINES
WARNING: Wear eye and hand protection
when disconnecting components
containing refrigerant. Plug all exposed
connections immediately.
1. When disconnecting any hose or pipe
connection the system must be discharged of all
pressure. Proceed cautiously, regardless of
gauge readings. Open connections slowly,
keeping hands and face well clear, so that no
injury occurs if there is liquid in the line. If
pressure is noticed, allow it to bleed off slowly.
2. Lines, flexible end connections and components
must be capped immediately they are opened to
prevent the entrance of moisture and dirt.
3. Any dirt or grease on fittings must be wiped off
with a clean alcohol dampened cloth. Do not use
chlorinated solvents such as trichloroethylene. If
dirt, grease or moisture cannot be removed from
inside the hoses, they must be replaced with
new hoses.
4. All replacement components and flexible end
connections must be sealed, and only opened
immediately prior to making the connection.
5. Ensure the components are at room temperature
before uncapping, to prevent condensation of
moisture from the air that enters.
6. Components must not remain uncapped for
longer than fifteen minutes. In the event of delay,
the caps must be fitted.
7. Receiver/driers must never be left uncapped as
they contain Silica Gel crystals which will absorb
moisture from the atmosphere. A receiver/ drier
left uncapped must not be used, fit a new unit.
8. The compressor shaft must not be rotated until
the system is entirely assembled and contains a
charge of refrigerant.
9. A new compressor contains an initial charge of
of refrigerant oil. The compressor also contains a
holding charge of gas when received which
should be retained by leaving the seals in place
until the pipes are re-connected.
82
AIR CONDITIONING
NEW RANGE ROVER
8
ADJUSTMENT
10. The receiver/drier should be the last component
connected to the system to ensure optimum
dehydration and maximum moisture protection of
the system.
11. All precautions must be taken to prevent
damage to fittings and connections. Slight
damage could cause a leak with the high
pressures used in the system.
12. Always use two wrenches of the correct size,
one on each fitting when releasing and
tightening refrigeration unions.
13. Joints and ’O’ rings should be coated with
refrigeration oil to aid correct seating. Fittings
which are not lubricated with refrigerant oil are
almost certain to leak.
14. All lines must be free of kinks. The efficiency of
the system is reduced by a single kink or
restriction.
15. Flexible hoses should not be bent to a radius
less than 90 mm radius.
16. Flexible hoses should not be within 100mm of
the exhaust manifold.
17. Completed assemblies must be checked for
refrigeration lines touching metal panels. Any
direct contact of lines and panels transmits noise
and must be eliminated.
PERIODIC MAINTENANCE
Routine servicing, apart from visual checks, is not
necessary. The visual inspections are as follows:
Condenser
With a water hose or air line, clean the fins of the
condenser to remove flies, leaves, etc. Check the pipe
connections for signs of oil leakage.
Compressor
Check pipe connections for signs of oil leakage.
Check flexible hoses for swelling. Examine the
compressor belt for tightness and condition.
Evaporator
Examine the refrigeration connections at the unit. If
the system should develop a fault, or if erratic
operation is noticed.
See Fault diagnosis.
COMPRESSOR DRIVE BELT - DIESEL
Service repair no - 82.20.01
Adjust
1. Disconnect battery negative lead.
2. Raise the vehicle.
WARNING: Support on safety stands.
3. Remove cover from tensioner pulley. Slacken
pulley bolt.
4. Rotate tensioner pulley clockwise. Apply
following tension:
New belt = 8 Nm. (6 lbf.ft)
Existing belt = 6 Nm. (4 lbf.ft)
5. Tighten pulley bolt whilst applying correct load.
6. Fit cover to tensioner pulley.
7. Remove safety stands. Lower vehicle.
8. Reconnect battery negative lead.
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст