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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.
Recover refrigerant if the Liquid Gage Pressure is higher than the chart 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 at the end of the document to verify typical performance.
18-AC51D1-10F-EN
107 °F
Table 14.2
R-410A REFRIGERANT CHARGING CHART
FINAL SUBCOOLING (
LIQUID
8
9
10
11
12
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
°
F)
13
14
13
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