Trane A4HP5 Installation And Operation Manual page 14

STEP 3 - Stabilize the system by operating for a minimum of 20 minutes.
At startup, or whenever charge is removed or added, the system must be operated for a minimum of 20 minutes to
stabilize before accurate measurements can be made.
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, refrigerant 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 approximately 327 PSIG. (This is the shown as the intersection of
the Final Subcooling column and the Liquid Temperature row.)
STEP 6 - Adjust refrigerant level to attain proper gage pressure.
Add refrigerant if the Liquid Gage Pressure is lower than the chart value.
1. Connect gages to refrigerant bottle and unit as illustrated.
2. Purge all hoses.
3. Open bottle.
4. Stop adding refrigerant when liquid line temperature and Liquid Gage Pressure matches the charging chart
Final Subcooling value.
STEP 7 - Stabilize the system.
1. Wait 20 minutes for the system condition to stabilize between adjustments.
Note: When the Liquid Line Temperature and Gage Pressure approximately match the chart, the system
is properly charged.
2. Remove gages.
3. Replace service port caps to prevent leaks. Tighten finger tight plus an additional 1/6 turn.
STEP 8 - Verify typical performance.
Refer to System Pressure Curves in this document to verify typical performance.
14
R-410A REFRIGERANT CHARGING CHART
LIQUID
TEMP
( ° F)
55 179
60 195
65 211
229
70
247
75
267
80
287
85
309
90
95 331
107 °F
100 355
105 381
110 407
115 435
120 464
125 495
Table 14.2
FINAL SUBCOOLING (
8 9 10 11 12
LIQUID GAGE PRESSURE (PSI)
182 185 188 191
198 201 204 208
215 218 222 225
232 236 240 243
251 255 259 263
271 275 279 283
291 296 300 304
313 318 322 327
336 341 346 351
360 365 370 376
386 391 396 402
413 418 424 429
441 446 452 458
470 476 482 488
501 507 514 520
From Dwg. D154557P01 Rev. 3
° F)
13 14
195 198
211 215
229 232
247 251
267 271
287 291
309 313
331 336
355 360
381 386
407 413
435 441
464 470
495 501
527 533
88-A4HP5001-1D-EN