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9
—
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 12141720232629323537404245
60
7 10121518212427303335384043
65
* 6 10 13 16 19 21 24 27 30 33 36 38 41
70
* * 71013161921242730333639
75
* * * 6 9 12 15 18 21 24 28 31 34 37
80
****581215182125283135
85
******811151922263033
90
******59131620242731
95
*******6101418222529
100
********81215202327
105
********5913172226
110
*********611152025
115
**********8141823
OUTDOOR
TEMP (C)
INDOOR COIL ENTERING AIR (C) WB
10 11 12 13 14 16 17 18 19 20 21 22 23 24
13
578911131416181921222325
16
467810121315171819212224
18
* 3 6 7 9111213151718202123
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
****3478101214161719
29
******4681112141718
32
******357911131517
35
*******36810121416
38
********478111315
41
********35791214
43
*********3681114
46
**********481013
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
2345678911
1
34567891112
2
456789111213
3
5678911121314
4
67891112131415
6
7 8 9 11 12 13 14 15 16
7
8 9 11 12 13 14 15 16 17
8
91112131415161718
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