Pressure Vs. Temperature Chart; Subcooling Method - Carrier 38HDF018-036 Installation, Start-Up And Service Instructions Manual

Table 4 — Pressure vs. Temperature Chart — Puron® Refrigerant (R-410A)
PRESSURE TEMPERATURE PRESSURE
PSIG °F PSIG
12 –37.7 114
14 –34.7 116
16 –32.0 118
18 –29.4 120
20 –26.9 122
22 –24.5 124
24 –22.2 126
26 –20.0 128
28 –17.9 130
30 –15.8 132
32 –13.8 134
34 –11.9 136
36 –10.1 138
38 –8.3 140
40 –6.5 142
42 –4.5 144
44 –3.2 146
46 –1.6 148
48 0.0 150
50 1.5 152
52 3.0 154
54 4.5 156
56 5.9 158
58 7.3 160
60 8.6 162
62 10.0 164
64 11.3 166
66 12.6 168
68 13.8 170
70 15.1 172
72 16.3 174
74 17.5 176
76 18.7 178
78 19.8 180
80 21.0 182
82 22.1 184
84 23.2 186
86 24.3 188
88 25.4 190
90 26.4 192
92 27.4 194
94 28.5 196
96 29.5 198
98 30.5 200
100 31.2 202
102 32.2 204
104 33.2 206
106 34.1 208
108 35.1 210
110 35.5 212
112 36.9 214
Subcooling Method —
cooling method is used to check and adjust charge during the
cooling season. Refer to Table 5 and the following procedure:
NOTE: For use with residential fan coils and the 40QA060
under ceiling unit only.
1. Operate unit a minimum of 15 minutes before checking
charge.
2. Measure liquid line temperature near liquid line service
valve, and measure the liquid pressure at the liquid line
service valve. Use a digital thermometer for all tempera-
ture measurements. DO NOT use mercury or dial-type
thermometers.
TEMPERATURE PRESSURE TEMPERATURE
°F PSIG
37.8 216 74.3
38.7 218 74.9
39.5 220 75.5
40.5 222 76.1
41.3 224 76.7
42.2 226 77.2
43.0 228 77.8
43.8 230 78.4
44.7 232 78.9
45.5 234 79.5
46.3 236 80.0
47.1 238 80.6
47.9 240 81.1
48.7 242 81.6
49.5 244 82.2
50.3 246 82.7
51.1 248 83.3
51.8 250 83.8
52.5 252 84.3
53.3 254 84.8
54.0 256 85.4
54.8 258 85.9
55.5 260 86.4
56.2 262 86.9
57.0 264 87.4
57.7 266 87.9
58.4 268 88.4
59.0 270 88.9
59.8 272 89.4
60.5 274 89.9
61.1 276 90.4
61.8 278 90.9
62.5 280 91.4
63.1 282 91.9
63.8 284 92.4
64.5 286 92.8
65.1 288 93.3
65.8 290 93.8
66.4 292 94.3
67.0 294 94.8
67.7 296 95.2
68.3 298 95.7
68.9 300 96.2
69.5 302 96.6
70.1 304 97.1
70.7 306 97.5
71.4 308 98.0
72.0 310 98.4
72.6 312 98.9
73.2 314 99.3
73.8 316 99.7
For 38HDR units only, the sub-
PRESSURE TEMPERATURE
°F PSIG °F
318 100.2
320 100.7
322 101.1
324 101.6
326 102.0
328 102.4
330 102.9
332 103.3
334 103.7
336 104.2
338 104.6
340 105.1
342 105.4
344 105.8
346 106.3
348 106.6
350 107.1
352 107.5
354 107.9
356 108.3
358 108.8
360 109.2
362 109.6
364 110.0
366 110.4
368 110.8
370 111.2
372 111.6
374 112.0
376 112.4
378 112.6
380 113.1
382 113.5
384 113.9
386 114.3
388 114.7
390 115.0
392 115.5
394 115.8
396 116.2
398 116.6
400 117.0
402 117.3
404 117.7
406 118.1
408 118.5
410 118.8
412 119.2
414 119.6
416 119.9
418 120.3
3. Refer to Table 5. Find the 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 refriger-
ant to lower the temperature, or REMOVE refrigerant to
raise the temperature (allow a tolerance of ±3° F).
13
PRESSURE TEMPERATURE PRESSURE
PSIG °F PSIG
420 120.7 522
422 121.0 524
424 121.4 526
426 121.7 528
428 122.1 530
430 122.5 532
432 122.8 534
434 123.2 536
436 123.5 538
438 123.9 540
440 124.2 544
442 124.6 548
444 124.9 552
446 125.3 556
448 125.6 560
450 126.0 564
452 126.3 568
454 126.6 572
456 127.0 576
458 127.3 580
460 127.7 584
462 128.0 588
464 128.3 592
466 128.7 596
468 129.0 600
470 129.3 604
472 129.7 608
474 130.0 612
476 130.3 616
478 130.7 620
480 131.0 624
482 131.3 628
484 131.6 632
486 132.0 636
488 132.3 640
490 132.6 644
492 132.9 648
494 133.3 652
496 133.6 656
498 133.9 660
500 134.0 664
502 134.5 668
504 134.8 672
506 135.2 676
508 135.5 680
510 135.8 684
512 136.1 688
514 136.4 692
516 136.7 696
518 137.0
520 137.3
TEMPERATURE
°F
137.6
137.9
138.3
138.6
138.9
139.2
139.5
139.8
140.1
140.4
141.0
141.6
142.1
142.7
143.3
143.9
144.5
145.0
145.6
146.2
146.7
147.3
147.9
148.4
149.0
149.5
150.1
150.6
151.2
151.7
152.3
152.8
153.4
153.9
154.5
155.0
155.5
156.1
156.6
157.1
157.7
158.2
158.7
159.2
159.8
160.3
160.8
161.3
161.8