Carrier 25HNA Infinity
Series Installation Instructions Manual page 13

Heating Check Chart Procedure
To check system operation during heating cycle, refer to the Heat
Pump Charging Instructions label on outdoor unit. This chart
indicates whether a correct relationship exists between system
operating pressure and air temperature entering indoor and
outdoor units. If pressure and temperature do not match on chart,
system refrigerant charge may not be correct. Do not use chart to
adjust refrigerant charge.
NOTE: In heating mode, check refrigerant charge only when
pressures are stable. If in doubt, remove charge and weigh in
correct refrigerant charge.
LIQUID PRESSURE
AT SERVICE VALVE
(PSIG)
189
195
202
208
215
222
229
236
243
251
259
266
274
283
291
299
308
317
326
335
345
354
364
374
384
395
406
416
427
439
450
462
474
486
499
511
Table 4—Required Liquid−Line Temperature
REQUIRED SUBCOOLING TEMPERATURE (5F)
8 10
58 56
60 58
62 60
64 62
66 64
68 66
70 68
72 70
74 72
76 74
78 76
80 78
82 80
84 82
86 84
88 86
90 88
92 90
94 92
96 94
98 96
100 98
102 100
104 102
106 104
108 106
110 108
112 110
114 112
116 114
118 116
120 118
122 120
124 122
126 124
128 126
NOTE: When charging is necessary during heating season,
charge must be weighed in accordance with unit rating plate,
±0.6 oz./ft. of 3/8−in. liquid−line above or below 15 ft.,
respectively.
EXAMPLE:
To calculate additional charge required for a 25−ft. line set:
25 ft. − 15 ft. = 10 ft. X 0.6 oz./ft. = 6 oz. of additional charge.
(5F)
12 14
54 52
56 54
58 56
60 58
62 60
64 62
66 64
68 66
70 68
72 70
74 72
76 74
78 76
80 78
82 80
84 82
86 84
88 86
90 88
92 90
94 92
96 94
98 96
100 98
102 100
104 102
106 104
108 106
110 108
112 110
114 112
116 114
118 116
120 118
122 120
124 122
13
16 18
50 48
52 50
54 52
56 54
58 56
60 58
62 60
64 62
66 64
68 66
70 68
72 70
74 72
76 74
78 76
80 78
82 80
84 82
86 84
88 86
90 88
92 90
94 92
96 94
98 96
100 98
102 100
104 102
106 104
108 106
110 108
112 110
114 112
116 114
118 116
120 118