Page 12
Charge Using the Approach Method, TXV Sys-
tems
Outdoor Temperature > 65ºF (18ºC)
The following procedure is intended as a general guide and is
for use on expansion valve systems only. For best results,
outdoor temperature should be 70°F (21°C) to 80°F (26°C).
Monitor system pressures while charging.
1 − Record outdoor ambient temperature using a digital ther-
mometer.
2 − Attach high pressure gauge set and operate unit for sev-
eral minutes to allow system pressures to stabilize.
3 − Use the same digital thermometer you used to check the
outdoor ambient temperature to check the liquid line
temperature.
4 − The difference between the ambient and liquid tempera-
tures should match values given in table 2. If the values
don’t agree with the those in table 2, add refrigerant to
lower the approach temperature, or recover refrigerant
from the system to increase the approach temperature.
TABLE 6
XC13 Normal Operating Pressures (Liquid +10 & Suction +5 psig)
Model −018 −024 −030 −036 −042 −048 −060
The values below are typical pressures; indoor evaporator match up, indoor air quantity, and evaporator load will cause the
pressures to vary. Liquid Line Pressure / Vapor Line Pressure
*°F (°C) Fixed Orifice
65 (18)
238 / 130 249 / 126 239 / 124 251 / 129 240 / 120 249 / 123 243 / 117
70 (21)
253 / 130 269 / 130 257 / 127 271 / 132 260 / 124 267 / 126 264 / 120
75 (24)
273 / 134 288 / 133 277 / 129 291 / 135 280 / 128 286 / 129 285 / 123
80 (26)
295 / 138 310 / 136 298 / 132 312 / 137 301 / 131 306 / 131 306 / 126
85 (29)
316 / 141 331 / 138 320 / 135 334 / 139 323 / 133 328 / 133 329 / 129
90 (32)
339 / 144 352 / 141 342 / 138 358 / 142 344 / 135 349 / 135 352 / 131
95 (35)
363 / 147 379 / 143 365 / 140 383 / 143 368 / 137 372 / 137 376 / 134
100 (38)
386 / 149 400 / 144 390 / 142 408 / 145 390 / 139 396 / 139 402 / 136
105 (41)
411 / 151 425 / 147 414 / 143 435 / 147 417 / 141 419 / 141 427 / 137
110 (43)
437 / 153 453 / 148 440 / 145 460 / 148 440 / 142 446 / 143 456 / 139
115 (46)
467 / 155 481 / 150 468 / 147 490 / 150 468 / 144 475 / 145 485 / 141
Expansion Valve
65 (18)
237 / 135 244 / 136 243 / 131 238 / 133 231 / 129 247 / 130 250 / 125
70 (21)
255 / 136 263 / 137 262 / 131 256 / 134 250 / 130 264 / 132 270 / 126
75 (24)
275 / 137 283 / 138 281 / 132 278 / 135 269 / 131 281 / 134 291 / 127
80 (26)
295 / 138 306 / 140 303 / 133 300 / 136 291 / 133 307 / 136 312 / 129
85 (29)
317 / 139 326 / 141 325 / 134 324 / 137 314 / 134 325 / 137 334 / 130
90 (32)
339 / 140 351 / 141 348 / 135 348 / 138 336 / 135 353 / 138 358 / 132
95 (35)
363 / 142 376 / 142 372 / 136 374 / 139 362 / 135 386 / 139 383 / 133
100 (38)
387 / 143 400 / 143 397 / 137 400 / 140 383 / 137 403 / 140 408 / 134
105 (41)
413 / 144 428 / 144 422 / 139 429 / 142 409 / 139 428 / 141 434 / 136
110 (43)
440 / 145 456 / 145 449 / 140 458 / 143 435 / 140 457 / 142 461 / 137
115 (46)
471 / 147 486 / 146 478 / 141 500 / 144 463 / 142 485 / 144 489 / 139
*Temperature of the air entering the outside coil.
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