Daewoo Nubira. Manual — part 185
7B – 8
I
MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
DAEWOO V–121 BL4
A/C SCHEMATIC
MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7B – 9
DAEWOO V–121 BL4
DIAGNOSIS
GENERAL DIAGNOSIS
TESTING THE REFRIGERANT
SYSTEM
If you suspect a problem in the refrigerant system, check
for the following conditions:
1. Check the outer surfaces of the radiator and the
condenser cores to be sure that the airflow is not
blocked by dirt, leaves, or other foreign material.
Check between the condenser and the radiator, as
well as all outer surfaces.
2. Check for restrictions or kinks in the condenser
core, the hoses, and the tubes.
3. Check the operation of the blower fan.
4. Check all the air ducts for leaks or restrictions. Low
airflow rate may indicate a restricted evaporator
core.
5. Check for slippage of the compressor clutch.
6. Check the drive belt tension.
INSUFFICIENT COOLING ”QUICK
CHECK” PROCEDURE
Perform the following ”hand–feel” procedure to get a quick
idea of whether the A/C system has the proper charge of
Refrigerant–134a. The air temperature must be above
21
³
C (70
³
F) for most models.
1. Warm up engine. Run the engine at idle.
2. Open the hood and all the doors.
3. Turn the A/C switch ON.
4. Turn the temperature control knob to full cold.
5. Turn the blower speed to setting 4.
6. ”Hand–feel” the temperature of the evaporator out-
let pipe. The pipe should be cold.
7. Check for other problems. Refer to ”Testing the Re-
frigerant System” in this section.
8. Leak check the system. Refer to ”Leak Testing the
Refrigerant System” in this section. If you find a
leak, discharge the system and repair the leak, as
required. After completing the repair, evacuate and
charge the system.
9. If there is no leak, refer to ”Insufficient Cooling
Diagnosis” in this section.
7B – 10
I
MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
DAEWOO V–121 BL4
A/C PERFORMANCE TEST
RELATIVE
HUMIDITY
(%)
AMBIENT AIR
TEMPERATURE
³
C
³
F
LOW SIDE
PRESSURE
kPa psig
ENGINE
SPEED (RPM)
CENTER DUCT AIR
TEMPERATURE
³
C
³
F
HIGH SIDE
PRESSURE
kPa psig
20
21 70
27 81
32 90
38 100
200 29
200 29
207 30
214 31
2000
4 39
7 45
9 48
14 57
1034 150
1310 190
1689 245
2103 305
30
21 70
27 81
32 90
38 100
200 29
207 30
214 31
221 32
2000
6 43
8 46
11 52
16 61
1034 150
1413 205
1827 265
2241 325
40
21 70
27 81
32 90
38 100
200 29
207 30
221 32
269 39
2000
7 45
9 48
13 55
18 64
1138 165
1482 215
1931 280
2379 345
50
21 70
27 81
32 90
38 100
207 30
221 32
234 34
276 40
2000
8 46
12 54
15 59
21 70
1241 180
1620 235
2034 295
2413 350
60
21 70
27 81
32 90
38 100
207 30
228 33
248 36
296 43
2000
9 48
13 56
17 63
23 73
1241 180
1655 240
2068 300
2482 360
70
21 70
27 81
32 90
38 100
207 30
234 34
262 38
303 44
2000
10 50
14 57
18 64
24 75
1276 185
1689 245
2103 305
2517 365
80
21 70
27 81
32 90
207 30
234 34
269 39
2000
10 50
15 59
19 66
1310 190
1724 250
2137 310
90
21 70
27 81
32 90
207 30
248 36
290 42
2000
10 50
17 63
22 72
1379 200
1827 265
2275 330
MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7B – 11
DAEWOO V–121 BL4
PRESSURE–TEMPERATURE RELATIONSHIP OF R–134A
TEMPERATURE
³
C (
³
F)*
PRESSURE
kPa (psig)*
TEMPERATURE
³
C (
³
F)*
PRESSURE
kPa (psig)*
–8.89 (16)
105.70 (15.33)
37.78 (100)
856.84 (124.27)
–7.78 (18)
114.87 (16.66)
38.89 (102)
886.56 (128.58)
–6.67 (20)
124.32 (18.03)
40.00 (104)
916.35 (132.98)
–5.56 (22)
134.11 (19.45)
41.11 (106)
947.92 (137.48)
–4.44 (24)
144.24 (20.92)
42.22 (108)
979.64 (142.08)
–3.33 (26)
154.65 (22.43)
43.33 (110)
1012.11 (146.79)
–2.22 (28)
165.48 (24.00)
44.44 (112)
1045.21 (151.59)
–1.11 (30)
176.65 (25.62)
45.56 (114)
1079.14 (156.51)
0.00 (32)
188.16 (27.29)
46.67 (116)
1113.75 (161.53)
1.11 (34)
200.02 (29.01)
47.78 (118)
1149.12 (166.66)
2.22 (36)
212.30 (30.79)
48.89 (120)
1185.18 (171.89)
3.33 (38)
224.98 (32.63)
50.00 (122)
1222.07 (177.24)
4.44 (40)
238.08 (34.53)
51.11 (124)
1259.72 (182.70)
7.22 (45)
272.49 (39.52)
52.22 (126)
1298.12 (188.27)
10.00 (50)
309.58 (44.90)
53.33 (128)
1337.35 (193.96)
12.77 (55)
349.51 (50.69)
54.44 (130)
1377.35 (199.76)
15.56 (60)
392.33 (56.90)
57.22 (135)
1480.91 (214.78)
18.33 (65)
438.18 (63.55)
60.00 (140)
1589.57 (230.54)
21.11 (70)
487.27 (70.67)
62.78 (145)
1703.62 (247.08)
23.89 (75)
539.67 (78.27)
65.56 (150)
1823.04 (264.40)
26.67 (80)
609.38 (88.38)
68.33 (155)
1948.04 (282.53)
29.44 (85)
655.09 (95.01)
71.11 (160)
2078.77 (301.49)
32.22 (90)
718.39 (104.19)
73.89 (165)
2215.29 (321.29)
35.00 (95)
785.61 (113.94)
76.67 (170)
2357.81 (341.96)
* All values rounded to two decimal places.
EVAPORATOR RANGE: From –6.67 to 7.22
³
C (20 to 45
³
F), the temperatures represent the gas temperatures inside the
coil and not on the coil surfaces. Add 1.67 to 5.56
³
C (3–10
³
F) to the temperature for coil and air–off temperatures.
CONDENSER RANGE: From 110 to 160
³
F, temperatures are not ambient. Add 19.4 to 22.2
³
C (35 to 40
³
F) for proper
heat transfer, then refer to the pressure chart.
Example:
32
³
C (90
³
F) ambient temperature
+ 22
³
C + (40
³
F)
54
³
C (130
³
F)
Condenser temperature = 1379 kPa (200 psig)
Based on 48.3 km/h (30 mph) air flow.
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст