SCHEMATIC DIAGRAM
SUBCOOLING CHARGING IN COOLING ABOVE 55°F OD AMBIENT
The manufacturer has always recommended installing approved
matched indoor and outdoor systems.
All 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 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 startup, or whenever charge is removed or added, the system
must be operated for a minimum 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 Sub cooling
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 the table, or remove refrigerant
to lower the pressure. Again, wait 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 to verify typical performance.
8910 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
R-410A 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
2 4TTA3AD-SF-1A
To Next Page
Loading...
