82
AIR CONDITIONING
Evacuation and recharging
LEAK TEST SYSTEM
1.
2.
Add refrigerant oil to compressor if necessary.
Renew the receiver/drier.
The following instructions refer to an electronic type
Refrigerant Leak Detector for use with R134a, which
are the safest and most sensitive.
CAUTION: When a major repair has been
carried out, a leak test should be carried
out using inert gas.
CAUTION: When a major repair has been
carried out, a leak test should be carried
out using an inert gas (see below).
3.
Connect a Refrigerant Station to the high and
low pressure servicing connections.
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.
CAUTION: Whenever the refrigerant
system is opened, the receiver/drier must
be renewed immediately before evacuating
and recharging the system.
3.
Commence searching for leaks by passing the
detector probe around all joints and components,
refrigerant gas is heavier than air.
4.
Operate the refrigerant evacuation system
according to the manufacturer’s instructions.
4.
Insert the probe into an air outlet of the
NOTE: If the vacuum reading is below
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.
700mmHg
after 15 minutes, suspect a leak
in the system. Partially recharge the
system and check for leaks using an electronic
leak tester. Check suction lines first, then run the
compressor for 5 minutes and then check the high
pressure lines.
6.
Check all service valve connections, valve plate,
head and base plate joints and back seal plate.
CAUTION: The system must be evacuated
immediately before recharging
commences. Delay between evacuation
and recharging is not permitted.
7. Check the condenser for leaks at the pipe
unions.
8. If any leaks are found, the system must be
discharged before rectification.
5.
Operate the refrigerant recharging system
according to the manufacturer’s instructions:-
9. Rectify any leaks and recheck for leaks during
evacuation prior to charging.
Refrigerant required to charge system:
Leak test using inert gas
Without rear air conditioning = 0.90kg (32 fl/oz)
With rear air conditioning = 1.15kg (40 fl/oz)
Use Nitrogen or Helium gas.
6.
If the full charge has not been accepted by the
system, start the engine and run it at 1500
rev/min for a minimum of 2 minutes.
1. Connect gas line to recharging station.
2. Pressurise system to 3 bar.
3. Carry out leak test as above.
Switch on the air conditioning system, open the
car windows, set the temperature control to cold
and switch the blower to maximum speed.
Consult Refrigerant Station Manual for correct
procedure to complete the charge.
7.
8.
Carry out the air conditioning system
performance test.
4
ADJUSTMENT
| Categories | Land Rover Discovery, Range Rover |
|---|---|
| Tags | Land Rover |
| Model Year | 1995 |
| Download File |
|
| Document Type | Workshop Manual |
| Language | English |
| Product Name | Discovery |
| Product Brand | Land Rover |
| Document File Type | |
| Publisher | landrover.com |
| Wikipedia's Page | http://en.wikipedia.org/wiki/Land_Rover |
| Copyright | Attribution Non-commercial |
(0 votes, average: 0 out of 5)