Trane 4TWX8 Installer's Manual page 19

STEP 4 - Measure the liquid line temperature
and pressure at the outdoor unit's service valve.
Measured Liquid Line Temp = __________ º F
Liquid Gage Pressure = __________ PSIG
Final Subcooling Value = __________ º F
STEP 5 - Use the final subcooling value, refriger-
ant temperature and pressure from STEP 4, to
determine the proper liquid gage pressure using
Table 14.2.
Example: Assume a 12º F Final Subcooling
value and liquid temp of 90º F.
1. Locate 12º F Final Subcooling in Table 14.2.
2. Locate the Liquid Temperarature (90º F) in
the left column.
3. The Liquid Gage Pressure should be ap-
proximately 327 PSIG. (This is the shown as
the intersection of the Final Subcooling column
and the Liquid Temperature row.
18-BC91D1-6B-EN
Table 14.2
R-410A REFRIGERANT CHARGING CHART
FINAL SUBCOOLING (
LIQUID
8 9 10 11
TEMP
( ° F)
LIQUID GAGE PRESSURE (PSI)
55 179 182 185 188 191 195 198
60 195 198 201 204 208 211 215
65 211 215 218 222 225 229 232
70 229 232 236 240 243 247 251
75 247 251 255 259 263 267 271
80 267 271 275 279 283 287 291
85 287 291 296 300 304 309 313
90 309 313 318 322 327 331 336
95 331 336 341 346 351 355 360
100 355 360 365 370 376 381 386
105 381 386 391 396 402 407 413
110 407 413 418 424 429 435 441
115 435 441 446 452 458 464 470
120 464 470 476 482 488 495 501
125 495 501 507 514 520 527 533
From Dwg. D154557P01 Rev. 3
107 °F
°
F)
12 13 14
19