Interface Fan Board; Subcooling Charging Chart - Carrier 48VG-A Installation Instructions Manual

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Fig. 21 - Interface Fan Board (IFB) 460 VAC Models
Table 12 - Subcooling Charging Chart
Required Subcoohng °F(°C)
Outdoor Ambient Temperature °F(°C) Required Subcooiin 9 {OF)
Model Size Pressure
75 (24) 85 (29) 05 (35) 105 (41) 115 (40) (psig) 5 10 15 20 28
189 61 56 81 46 41
024 15 (8.2) 15 (8.2) 18 (7.5) 11 (6.2) 1t (6.2) 196 63 58 53 48 43
030 12 (6.9) 12 (6.9) 12 (6.9) 11 (8,2) 11 (6.2) 203 66 61 56 51 48
036 12 (6,9) 12 (6,9) 12 (6.9) 11 (6,2) 10 (5,6) 219 68 83 88 53 48
042 15 {8,2) t4 (7,8) 14 (7,8) 12 (8,9) 11 (6,2) 217 70 05 60 55 50
048 14 (7.8) 13 (7.5) 13 (7.5) 13 (7.5) 12 (6.9) 224 72 67 62 57 82
080 18 (9,9) 18 (9,9) 18 (9,9) 17 (9,4) 17 (9,4) 231 74 09 64 59 84
NOTE: Subcooling values calculated using High Stage. 238 76 71 66 61 50
245 77 72 67 62 57
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Procedure
252 79 74 69 64 89
i. Measure Discharge line pressure by attaching a gauge to the service port. 280 81 76 71 66 61
2. Measure the liquid line temperature by attaching a temperature sensing 268 83 78 73 08 63
device to it. 276 85 80 75 70 65
3. insulate the temperature sensing device so that the Outdoor Ambient 284 87 82 77 72 67
doesn't affect the reading. 292 89 84 79 74 69
4. Refer to the required Subcooiing in the table based on the model size and 300 91 86 81 76 71
the Outdoor Ambient temperature. 309 93 88 83 78 73
5. Interpolate if the Outdoor ambient temperature lies in between the table
values. 318 95 90 85 80 75
5. Find the Pressure Value in the table corresponding to the measured 327 97 82 87 82 77
Pressure of the Compressor Discharge line. 336 99 94 89 84 79
7. Read across from the Pressure reading to obtain the liquid Jine 345 101 96 91 86 81
temperature for a required Subceeiing. 354 103 98 93 88 83
8. Add charge if the measured temperature is higher than the table value. 364 105 100 95 90 85
9. Remove charge if the measured temperature is lower than the table value. 374 107 102 97 92 87
Required Liquid Line Temperature for a Specific Subcoohn_ (R41OA)
Required Subcoolin_ !°C)
Pressure
(kPa) 3 6 8 11 14
1303 16 13 11 8 5
1351 17 15 12 9 6
1399 19 16 13 10 8
1448 20 17 14 11 9
1490 21 18 15 13 10
1544 22 19 16 14 11
1593 23 20 18 15 12
1641 24 21 19 16 13
1689 25 22 20 17 14
1737 26 23 21 18 18
1792 27 25 22 19 16
1848 29 26 23 20 17
1903 30 27 24 21 19
1958 31 28 25 22 20
2013 32 29 26 23 21
2068 33 30 27 24 22
2130 34 31 28 26 23
2192 35 32 29 27 24
2284 36 33 31 28 25
2318 37 34 32 29 26
2378 38 35 33 30 27
2440 39 36 34 31 28
2509 40 38 35 32 29
2578 41 39 36 33 38
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384 108 103 98 93 88
394 110 105 100 95 90
404 112 107 102 97 92
414 114 109 104 99 94
424 116 111 106 101 96
434 118 113 108 103 98
444 119 114 109 184 98
454 121 116 111 106 101
464 123 118 113 108 103
474 124 115 114 189 104
484 126 121 116 111 106
494 127 122 117 112 107
504 129 124 119 114 109
514 131 126 121 118 111
524 132 127 122 117 112
534 134 129 124 119 114
2647 42 40 37 34 31
2716 44 41 38 35 32
2785 45 42 39 30 33
2854 46 43 40 37 34
2923 47 44 41 38 35
2992 48 45 42 39 36
3061 48 46 43 40 37
3130 49 47 44 41 38
3199 50 48 45 42 39
3268 51 48 46 43 40
3337 52 49 47 44 41
3468 53 50 47 45 42
3475 54 51 48 46 43
3544 55 52 49 46 44
3612 56 53 50 47 45
3681 56 54 51 48 45
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