|nsta||er's Guide
SUBCOOLING CHARGING iN COOLING ABOVE 55°F OD AMBIENT
Trane has always recommended installing Trane approved
matched indoor and outdoor systems.
All Trane split systems are ARI rated with only TXV indoor
systems.
The benefits of installing approved indoor and outdoor split
systems are maximum efficiency, optimum performance and
the best overall system reliability.
The following charging methods are therefore
prescribed for systems with indoor TXVs.
1. Subcooling (in the cooling mode) is the
recommended method of charging above
55°F ambient temperatures.
2. For best results - the indoor temperature
should be kept between 70°F to 80°F. Add
system heat if needed.
3. At start-up, or -whenever charge is
removed or added, the system must be
operated for a minimum twenty (20)
minutes to stabilize before accurate
measurements can be made.
4. Measure Liquid Line Temperature and
Refrigerant Pressure at service valves.
5. Determine total refrigerant line length,
and height (lift) if indoor section is above
the condenser.
6. Determine the Design Subcool Charging
Temperature from the unit nameplate.
7. Locate this value in the appropriate col-
umn of the Subcooling Charging Table.
Locate your liquid line temperature in the
left column of the table, and the
intersecting liquid line pressure under
your nameplate subcool value column. Add
refrigerant to raise the pressure to match
LIQUID
TEMP
(°F)
the table, or remove refrigerant to lower the pressure.
Again, -wait twenty (20) minutes for the system
conditions to stabilize before adjusting charge again.
8. When system is correctly charged, you can refer to
System Pressure Curves (in Service Facts) to verify
typical performance.
R=410A REFRIGERANT CHARGING CHART
DESIGN SUBCOOLING (°F)
8 I 9 ! lo 111 ! 12113
LIQUID GAGE PRESSURE (PSI)
I 14
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
Refer to Service Facts or
Installer's Guide for charging method.
From Dwg. D154557P01 Rev. 2
SUBCOOL CHARGING TABLE CORRECTIONS FOR LINE LENGTH AND RISE
ZLU
<EL
(..5
=J
LU
rr-q
E0
50
i°
0
.,5
,cO
15
10
0 Subtract 10 psig from S.C. Table Pressure
Table Pressure
10 20 25 30 40 60
TOTAL REFRIGERANT LINE LENGTH (FEET)
80
6 18-AC51 D1-4
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