Advertisement
AIR CONDITIONING
24-1 3
flame will detect only large leaks. As soon as the
re-
action plate seen through the window in the burner
shield becomes red hot, the tester is ready for
use.
(2)
Examine all tube connectors and other possible
leak points by moving the end of the sampling hose
from point to point. Since refrigerant 12 is heavier
than air,
it is
good practice to place the open end of
the sampling hose directly below the point being
tested. Be careful not to pinch the sampling tube
since this will shut
off
the air supply to the flame and
cause a color change.
(3) Watch for a change in the color of the flame.
Small leaks will produce a green color and large leaks
a
bright blue color. If leaks are observed at the tube
fittings, tighten the connection, using the proper flare
wrenches, and retest.
If the system is free
of leaks, or after correcting a
leak, if no air conditioning components have been re-
moved, add necessary refrigerant as described under
TEST
4
"Correcting Low Refrigerant Level." If any
TEMPERATURE-PRESSURE
parts of the refrigerant system were disconnected,
re-
move the sweep test charge. Close the refrigerant
manifold valve so that any refrigerant remaining in
the container is sealed. Remove the long test hose
from the refrigerant manifold. Insert the free end of
this test hose into an exhaust system outlet. Open the
right-hand gauge
set
manifold valve a fraction of a
turn to let the sweep-test charge escape slowly. Allow
the system to discharge until the discharge pressure
gauge registers zero. Open the left-hand gauge valve
to allow any refrigerant trapped in the suction side of
the system to escape.
TEST 4
CORRECTING LOW REFRIGERANT
LEVEL
Since the refrigeration system is completely sealed,
refrigerant level will not be low unless there is a leak
RELATIONSHIP CHART
(FOR REFRIGERANT 12)
Temp.
Press.
Temp.
Press.
Temp.
Press.
Temp.
Press.
Temp.
Press.
F.
PSI
F.
PSI
F.
PSI
F.
PSI
F.
PSI
0
2
4
6
8
10
12
14
16
18
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
9.1
10.1
11.2
12.3
13.4
14.6
15.8
17.1
18.3
19.7
21
.o
21.7
22.4
23.1
23.8
24.6
25.3
26.1
26.8
27.6
28.4
29.2
30.0
30.9
31.7
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
32.5
33.4
34.3
35.1
36.0
36.9
37.9
38.8
39.7
40.7
41.7
42.6
43.6
44.6
45.6
46.6
47.8
48.7
49.8
50.9
52.0
53.1
55.4
56.6
57.1
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
57.7
58.9
60.0
61.3
62.5
63.7
64.9
66.2
67.5
68.8
70.1
71.4
72.8
74.2
75.5
76.9
78.3
79.2
81.1
82.5
84.0
85.5
87.0
88.5
90.1
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
1 07
108
109
91.7
110
93.2
111
94.8
112
96.4
113
98.0
114
99.6
115
101.3
116
103.0
117
104.6
118
106.3
119
108.1
120
109.8
121
111.5
122
1 13.3
123
115.1
124
116.9
125
118.8
126
120.6
127
122.4
128
124.3
129
126.2
130
128.1
131
130.0
132
132.1
133
135.1
134
136.0
138.0
140.1
142.1
144.2
146.3
148.4
151.2
152.7
154.9
157.1
159.3
161.5
163.8
1 66.1
168.4
170.7
173.1
175.4
177.8
182.2
182.6
185.1
187.6
190.1
Hide quick links:
Advertisement
