6
18-BB41D1-1C-EN
Charging in Cooling above
55°F OD Ambient
If servicing the equipment requires system evacuation,
then re-charge the system to the weight specified on
the nameplate. Verify the system subcooling using the
Subcooling Charging Table and, if necessary, adjust
the charge using the procedure below.
1. For best results — the indoor temperature should
be kept between 70°F to 80°F. Add system heat if
needed.
2. 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.
3. Measure Liquid Line Temperature and Refrigerant
Pressure at service valved in the compressor
compartment.
4. Locate your liquid line temperature in the left
column of the table, and the intersecting liquid line
pressure under the 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.
NNoottee:: System charge shall never be more than 110% or
less than 90% of nameplate charge. If specified
subcooling cannot be achieved within those
charge bounds, contact your Field Service
Representative.
5. When system is correctly charged, you can refer to
System Pressure Curves to verify typical
performance.
CCHHAARRGGIINNGG BBEELLOOWW 5555°°FF
Evacuate system and weigh in nameplate charge or
use factory charge. Correct subcooling may be verified
when the temperature is above 55°F.
R-410A REFRIGERANT CHARGING CHART
Refer to Service Facts or Installer’s Guide for charging method
LIQUID
TEMP
(°F)
DESIGN SUBCOOLING (°F)
6 8 9 10 11 12 13 14 16
LIQUID GAGE PRESSURE (PSI)
55 174 179 182 185 188 191 195 198 205
60 189 195 198 201 204 208 211 215 222
65 205 211 215 218 222 225 229 232 240
70 222 229 232 236 240 243 247 251 259
75 240 247 251 255 259 263 267 271 279
80 259 267 271 275 279 283 287 291 301
85 279 287 291 296 300 304 309 313 323
90 301 309 313 318 322 327 331 336 347
95 323 331 336 341 346 351 355 360 371
100 347 355 360 365 370 376 381 386 398
105 371 381 386 391 396 402 407 413 425
110 398 407 413 418 424 429 435 441 454
115 425 435 441 446 452 458 464 470 484
120 454 464 470 476 482 488 495 501 516
125 484 495 501 507 514 520 527 533 549
From Dwg. D154557P01
CChhaarrggiinngg BBeellooww 5555°FF OODD AAmmbbiieenntt iinn HHeeaattiinngg OOnnllyy
1. The Subcool Charging Method in cooling is NOT
recommended below 55°F outdoor ambient.
2. The only recommended method of charging at
outdoor ambients below 55°F, is to weigh in the
charge in the heating mode.
3. Use Nameplate charge.
4. Check liquid line temperature and pressure (at the
OD valves) to obtain a minimum of the subcooling
shown in the subcooling table.
5. Add charge if the minimum subcooling as shown in
the table is not obtained with the nameplate charge.
6. It is important to return in the spring or summer to
accurately charge the system in the cooling mode
at outdoor ambients above 55°F.
IInnttrroodduuccttiioonn,, UUnniitt IInnssppeeccttiioonn aanndd SSppeecciiffiiccaattiioonn
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