Trane 5TTR4018A - Page 14

14 18-AC128D1-1B-EN
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 Target.
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.
PRESSURE CURVE SAMPLE
Cooling @ 1450 SCFM Heating @ 1350 SCFM
DISCHARGE PRESSURE (PSIG)
OUTDOOR TEMPERATURE (Degree F)
SUCTION PRESSURE (PSIG)
110
115
120
125
130
135
140
145
150
155
160
165
170
40 60 80 100 120
200
250
300
350
400
450
500
550
40 60 80 100 120
(1)
(1)
(3)
(3)
(5)
(4)
(2)
(2)
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
30
40
50
60
70
80
90
100
110
120
130
140
-5 5 152535455565
200
250
300
350
400
450
500
-5 5 152535455565
INDOOR ENTERING
DRY BULB CURVES
TOP TO BOTTOM
80, 70, AND 60 DEG F.
INDOOR ENTERING
DRY BULB CURVES
TOP TO BOTTOM
80, 70, AND 60 DEG F.
Table 14.2
107 °F
8 9 10 11 12 13 14
170 172
175 178 181 184 187
184 187
190 194 197 200 203
200
203 206 210 213 217 220
217
220 223 227 230 234 238
234
238 241 245 249 252 256
252
256 260 264 268 272 276
272
276 280 284 288 292 297
292
297 301 305 309 314 318
314
318 323 327 332 336
341
336
341 346 351 355 360 365
360
365 370 375 380 385 390
385
390 396 406 412 417
412
417 422 428 433 439 445
439
445 450 456 462 468 474
468
474 480
486
492 498 504
R-454B REFRIGERANT CHARGING CHART
55
60
65
70
75
80
85
90
95
100
105
110
115
120
125
LIQUID
TEMP
(
°
F)
DESIGN SUBCOOLING (
°
F)
LIQUID GAGE PRESSURE (PSI)
401