jcb JS130, Руководство по обслуживанию

Страница: 109 / 533

12 - 10
System Diagnosis (cont'd)
Low R-134a Charge
Gauge Readings:
Low Side Gauge - Low.
High Side Gauge - Low.
Other symptoms:
Sight Glass - Bubbles continuously visible.
Diagnosis:
System slightly low on R-134a, due to leak or
incorrect charge.
Correction:
1. Leak test system.
2. Evacuate A/C system.
3. Repair system leaks.
4. Charge system with R-134a.
5. Operate system and check performance.
Poor Refrigerant Circulation
Gauge Readings:
Low Side Gauge - Zero to negative.
High Side Gauge - Low.
Other symptoms:
Receiver-Drier - Frost on tubes from receiver-drier
to evaporator unit.
Diagnosis:
Refrigerant flow obstructed by dirt, receiver-drier
clogged.
Correction:
1. Evacuate A/C system.
2. Replace receiver-drier.
3. Charge system with R-134a.
4. Operate system and check performance.
LOW SIDE (RED) HIGH SIDE (BLUE)
Low Low
Section B Body & Framework
9803/6410
Section B
12 - 10
Issue 1
Air Conditioning
LOW SIDE (RED) HIGH SIDE (BLUE)
Zero to negative Low
LOW SIDE - 0.76 bar (0.77 kgf/cm 2 )(11 lbf/in 2 )
HIGH SIDE - 8.3 bar (8.5 kgf/cm
2
)(121 lbf/in
2
)
LOW SIDE - -1.0 bar (-1.1 kgf/cm 2 )(-15 lbf/in 2 )
HIGH SIDE - 5.4 bar (5.5 kgf/cm 2 )(78 lbf/in 2 )
50
40
30
30
0
10
20
60
70 80
90
100
110
120
350
150
100
500
0
50
200 250
300
350
400
450
A268030
50
40
30
30
0
10
20
60
70 80
90
100
110
120
350
150
100
500
0
50
200 250
300
350
400
450
A268040