Great Wall service chassis and body Manual — part 92
AC-12
Air-Conditioning System
Compressor
Installation of manifold gauge
Remark: Connect the manifold gauge to the auxiliary valve of
compressor.
1.
Turn off the manual valve of manifold gauge.
2.
Mount the packing hose of manifold gauge on the packing
valve.
Mount the LP hose to the LP packing valve and the HP hose to
HP packing valve. Then screw up the nuts for hose joint by
hand.
Remark: Do not coat the compressor lubricant on the connec-
tion positions.
packing hose
efrigeration system
connected to mani-
fold gauge
connect to compressor
turn off
turn off
Compressor
On vehicle inspection
1.
Mount the manifold gauge;
(see manifold gauge mount)
2.
Run the engine at the speed of 1500 r/m or so;
3.
Check the compressor according to the following items:
(a)
The HP gauge readings under the normal system should
satisfy the specified value of (1.4-1.7)MPa , that of LP
gauge should meet the specified value of (0.15-0.2)MPa .
(b)
Whether there is abnormal sound;
(c)
Whether there is leakage at the shaft oil seal.
If any problem is found, repair or change the compressor.
4.
Check the electromagnetic clutch:
(a)
Check to see whether there is lubricant trace on the
pressing plate and rotor;
(b)
Check to see whether there is noise or lubricant leakage
at the clutch bearing;
(c)
Measure the resistance between the stator coils that is set
between the clutch lead and the grounding lead with the
ohmn meter.
Standard resistance:
SL SK SJ
(3.2 .2)
Ω
Dr SF SY
(3.5 .2)
Ω
In case the requirement is not satisfied, change the compressor.
AC-13
Air-Conditioning System
Compressor
Disassemble of compressor
1.
Run the engine in the idle status for ten minutes under
the air-conditioning situation;
2.
Turn off the engine;
3.
Disconnect the cathode lead from the storage cell;
4.
Disconnect the electromagnetic clutch lead from the
matching wire;
5.
Exhaust the refrigerant from the refrigeration system;
6.
Disconnect the two hoses from the auxiliary valve of
compressor;
Cover the opening joint with cork right away to prevent the wet
gas entering in to the system.
7.
Tear down the compressor:
(a)
Tear down the fan cover;
(b)
Loosen the driving belt;
(c)
Tear down the fixing bolts of compressor bracket and the
compressor.
Mount of compressor
1.
Mount the compressor with fixing bolts;
Tightening moment
(25-30)Nm
2.
Mount the driving belt correctly;
Requirement for belt tension: the tension belt is allowed
to reduce (9-13)mm under 98N after the compressor
runs for five minutes;
3.
Connect the two hoses to the auxiliary valve of
compressor;
Tightening moment
(see page AC-8)
4.
Connect the clutch lead to the matching wire;
5.
Connect the cathode lead of storage cell to the storage
cell, and
6.
Vacuumize the system and inflate the refrigerant:
Vacuum time:
Dr SL SK SF SJ
Vacuumize for 20min and main-
tain the pressure for 30min;
SY
Vacuumize for 30min and maintain for 30min
Inflated refrigerant quantity:
Dr
(600-650)g
SL
700 0g
SK SJ
560 0g
SF
(700-720)g
SY
850 0g
correct
incorrect
incorrect
98N
AC-14
Air-Conditioning System
Liquid Tank
Liquid Tank
Check to see whether there is leakage in observation window,
fusible plug and joints;
Conduct the inspection with the gas leakage detector and, if
necessary, repair or change the liquid tank.
Dismantle of Liquid Tank
1.
Exhaust the refrigerant;
2.
Tear down the two liquid pipes from the liquid tank;
Remark: the opened joint should be plugged with cork so as to
prevent the humid air from entering into the system.
3.
Tear down the liquid tank from the tank bracket.
Mount of Liquid Tank
1.
Mount the liquid tank on the liquid tank bracket;
Remark: the cover of joint should not be take down before
connecting the pipe;
2.
Connect the two liquid pipes to the liquid tank;
Tightening moment
(See page AC-8)
3.
Vacuumize the system and inflate the refrigerant in;
Vacuumizing time:
Dr SL SK SF SJ
Vacuumize for 20 min and main-
tain the pressure for 30min;
SY
Vacuumize for 30 min and maintain the pres-
sure for 30min.
4.
Dr
(600-650)g
SL
700 0g
SK SJ
560 0g
SF
(700-720)g
SY
850 0g
liquid pipe
condenser
liquid tank
liquid pipe
liquid pipe
liquid pipe
liquid tank
condenser
SL SK SY SJ
Dr SF
AC-15
Air-Conditioning System
Condenser
Condenser
Condenser dismantle
1.
Check the radiating ribs of condenser to see whether
there is blocking or damage;
if the radiating rib is blocked, wash it with water and dry it with
compressed air.
Notice: be careful not to damage the radiating rib;
2.
Check the condenser joint to see whether there is leakage;
Make reparation as requirement;
Condenser disassembly
1.
Exhaust the refrigerant;
2.
Tear down the median mesh and the bonnet lock bracket;
3.
Disconnect the outlet hose from the entrance joint of
condenser;
4.
Tear down the liquid pipe from the outlet of liquid tank;
Remark: the opened joint should be plugged with cork so as to
prevent the humid air from entering into the system.
5.
Tear down the condenser:
Tear down the two bolts.
Condenser mount
1.
Mount the condenser
Screw on the two bolts so that the rubber washer contacts the
mounting flanges correctly.
2.
Connect the liquid pipe to the liquid tank and the outlet
hose to the condenser.
Tightening moment
(See page AC-8)
3.
Mount the median mesh and the bonnet lock bracket;
4.
vacuumize the air-conditioning system;
Vacuumizing time:
Dr SL SK SF SJ
vaccumize for 20min and main-
tain the pressure for 30min;
SY
vaccumize for 30min and maintain the pres-
sure for another 30min.
5.
Inflate the refrigerant in the air-conditioning system and
check to see whether there is air leakage:
Dr
(600-650)g
SL
700 0g
SK SJ
560 0g
SF
(700-720)g
SY
850 0g
liquid pipe
condenser
liquid tank
liquid pipe
condenser
liquid tank
SL SK SY SJ
Dr SF
liquid pipe
outlet hose
liquid pipe
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст