Trane 4TTB3-D, Installer'S Manual, Page: 6 / 8

6 18-AC80D1-2
Installer’s Guide
3.5 Ton Subcooling Charging Table 1.5 Ton Subcooling Charging Table
4 Ton Subcooling Charging Table
2 and 3 Ton Subcooling Charging Table
5 Ton Subcooling Charging Table 2.5 Ton Subcooling Charging Table
SUBCOOlInG ChArGInG In COOlInG ABOVe 55°F OD AMBIenT
The Trane company has always recommended installing
Trane approved matched indoor and outdoor systems.
All Trane split systems are AHRI 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 only recommend-
ed method of charging above 55°F ambient tempera-
tures.
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 column 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
8 9 10 11 12 13 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
r­410A reFrIGerAnT ChArGInG ChArT
Refer to Service Facts or
Installer's Guide for charging method.
LIQUID
TEMP
( ˚ F)
DESIGN SUBCOOLING (
˚
F)
LIQUID GAGE PRESSURE (PSI)
From Dwg. D154557P01 Rev. 2
subcool value column. Add refrigerant to raise the
pressure to match 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.
60
50
40
30
25
20
15
10
0 10 20 25 30 40 60 80
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
REFRIGERANT LINE LIFT (FEET)
TOTAL REFRIGERANT LINE LENGTH (FEET)
Use Design Subcool Value (8º)
Add 2º
Add 2º
Add 1º
Add 3º
Add 4º
Add 5º 60
50
40
30
25
20
15
10
0 10 20 25 30 40 60 80
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
REFRIGERANT LINE LIFT (FEET
)
TOTAL REFRIGERANT LINE LENGTH (FEET)
Use Design Subcool Value (10º)
Add 1º
Add 1º
Add 2º
Add 2º
Add 3º
Add 3º
Add 4º
60
50
40
30
25
20
15
10
0 10 20 25 30 40 60 80
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
REFRIGERANT LINE LIFT (FEET
)
TOTAL REFRIGERANT LINE LENGTH (FEET)
Use Design Subcool Value (10º)
Add 1º
Add 5º
Add 5º
Add 2º
Add 6º
Add 3º
Add 3º
Add 6º
Add 7º
Add 4º
60
50
40
30
25
20
15
10
0 10 20 25 30 40 60 80
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
REFRIGERANT LINE LIFT (FEET
)
TOTAL REFRIGERANT LINE LENGTH (FEET)
Use Design Subcool Value (10º)
Add 3º
Add 2º
Add 2º
Add 2º
Add 1º
Add 1º
Add 1º
Add 3º
Add 4º
Add 4º
Add 5º
Add 5º
Add 6º
60
50
40
30
25
20
15
10
0 10 20 25 30 40 60 80
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
REFRIGERANT LINE LIFT (FEET
)
TOTAL REFRIGERANT LINE LENGTH (FEET)
Use Design Subcool Value (10º)
Add 1º
Add 2º
Add 3º
60
50
40
30
25
20
15
10
0 10 20 25 30 40 60 80
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
REFRIGERANT LINE LIFT (FEET
)
TOTAL REFRIGERANT LINE LENGTH (FEET)
Use Design Subcool Value (10º)
Add 1º
Add 2º
Add 3º