Bryant 538J-18-1 User Manual
Page 9
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9
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10. If air temperature entering outdoor coil or pressure
at suction valve changes, charge to new suction line
temperature indicated on chart.
NOTE: The above procedure is independent of indoor air
quantity.
B. Subcooling Method (Cooling, TXV)
To check and adjust charge during cooling season, use
Tables 6A and 6B and the following procedure:
1. Operate unit a minimum of 15 minutes before check-
ing charge.
2. Measure liquid line temperature near liquid line ser-
vice valve, and measure liquid pressure at liquid line
service valve. Use a digital thermometer for all tem-
perature measurements. DO NOT use mercury or
dial-type thermometers.
3. Refer to Tables 6A and 6B. Find temperature point at
which the required subcooling temperature intersects
the measured liquid line pressure.
4. If the measured liquid line temperature does not
agree with the required liquid line temperature, ADD
refrigerant to lower the temperature, or REMOVE
refrigerant to raise the temperature (allow a toler-
ance of ± 3 F).
Table 4A — Superheat Charging Table — English
(Superheat Entering Suction Service Valve)
LEGEND
WB — Wet Bulb
*Do not attempt to charge system under these conditions or refrigerant slug-
ging may occur.
Table 4B — Superheat Charging Table — SI
(Superheat Entering Suction Service Valve)
LEGEND
WB — Wet Bulb
*Do not attempt to charge system under these conditions or refrigerant slug-
ging may occur.
Table 5A — Required Suction-Tube Temperature (F)
— English (Entering Suction Service Valve)
Table 5B — Required Suction-Tube Temperature (C)
— SI (Entering Suction Service Valve)
OUTDOOR
TEMP (F)
INDOOR COIL ENTERING AIR (F) WB
50 52 54 56 58 60 62 64 66 68 70 72 74 76
55
9
12 14 17 20 23 26 29 32 35 37 40 42 45
60
7
10 12 15 18 21 24 27 30 33 35 38 40 43
65
*
6 10 13 16 19 21 24 27 30 33 36 38 41
70
*
*
7 10 13 16 19 21 24 27 30 33 36 39
75
*
*
*
6
9 12 15 18 21 24 28 31 34 37
80
*
*
*
*
5
8 12 15 18 21 25 28 31 35
85
*
*
*
*
*
*
8 11 15 19 22 26 30 33
90
*
*
*
*
*
*
5
9 13 16 20 24 27 31
95
*
*
*
*
*
*
*
6 10 14 18 22 25 29
100
*
*
*
*
*
*
*
*
8 12 15 20 23 27
105
*
*
*
*
*
*
*
*
5
9 13 17 22 26
110
*
*
*
*
*
*
*
*
*
6 11 15 20 25
115
*
*
*
*
*
*
*
*
*
*
8 14 18 23
OUTDOOR
TEMP (C)
INDOOR COIL ENTERING AIR (C) WB
10 11 12 13 14 16 17 18 19 20 21 22 23 24
13
5
7
8
9
11 13 14 16 18 19 21 22 23 25
16
4
6
7
8
10 12 13 15 17 18 19 21 22 24
18
*
3
6
7
9 11 12 13 15 17 18 20 21 23
21
*
*
4
6
7
9 11 12 13 15 17 18 20 22
24
*
*
*
3
5
7
8 10 12 13 16 17 19 21
27
*
*
*
*
3
4
7
8 10 12 14 16 17 19
29
*
*
*
*
*
*
4
6
8 11 12 14 17 18
32
*
*
*
*
*
*
3
5
7
9 11 13 15 17
35
*
*
*
*
*
*
*
3
6
8 10 12 14 16
38
*
*
*
*
*
*
*
*
4
7
8 11 13 15
41
*
*
*
*
*
*
*
*
3
5
7
9 12 14
43
*
*
*
*
*
*
*
*
*
3
6
8 11 14
46
*
*
*
*
*
*
*
*
*
*
4
8 10 13
SUPERHEAT
TEMP (F)
SUCTION PRESSURE AT SERVICE PORT (psig)
61.5
64.2 67.1 70.0 73.0 76.0 79.2 82.4 85.7
0
35
36
39
41
43
45
47
49
51
2
37
39
41
43
45
47
49
51
53
4
39
41
43
45
47
49
51
53
55
6
41
43
45
47
49
51
53
55
57
8
43
45
47
49
51
53
55
57
59
10
45
47
49
51
53
55
57
59
61
12
47
49
51
53
55
57
59
61
63
14
49
51
53
55
57
59
61
63
65
16
51
53
55
57
59
61
63
65
67
18
53
55
57
59
61
63
65
67
69
20
55
57
59
61
63
65
67
69
71
22
57
59
61
63
65
67
69
71
73
24
59
61
63
65
67
69
71
73
75
26
61
63
65
67
69
71
73
75
77
28
63
65
67
69
71
73
75
77
79
30
65
67
69
71
73
75
77
79
81
32
67
69
71
73
75
77
79
81
83
34
69
71
73
75
77
79
81
83
85
36
71
73
75
77
79
81
83
85
87
38
73
75
77
79
81
83
85
87
89
40
75
77
79
81
83
85
87
89
91
SUPERHEAT
TEMP (C)
SUCTION PRESSURE AT SERVICE PORT (kPa)
424
443
463
483
503
524
546
568
591
0
2
3
4
5
6
7
8
9
11
1
3
4
5
6
7
8
9
11
12
2
4
5
6
7
8
9
11
12
13
3
5
6
7
8
9
11
12
13
14
4
6
7
8
9
11
12
13
14
15
6
7
8
9
11
12
13
14
15
16
7
8
9
11
12
13
14
15
16
17
8
9
11
12
13
14
15
16
17
18
9
11
12
13
14
15
16
17
18
19
10
12
13
14
15
16
17
18
19
21
11
13
14
15
16
17
18
19
21
22
12
14
15
16
17
18
19
21
22
23
13
15
16
17
18
19
21
22
23
24
14
16
17
18
19
21
22
23
24
25
16
17
18
19
21
22
23
24
25
26
17
18
19
21
22
23
24
25
26
27
18
19
21
22
23
24
26
26
27
28
19
21
22
23
24
25
26
27
28
29
20
22
23
24
25
26
27
28
29
31
21
23
24
25
26
27
28
29
31
32
22
24
25
26
27
28
29
31
32
33