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XP21 SERIES
Operating and Temperature Pressures
Minor variations in these pressures may be expected due to differences in installations. Significant differences could mean
that the system is not properly charged or that a problem exists with some component in the system.
Table 8. Normal Operating Pressure − Liquid +10 and Vapor +5 PSIG*
5F (5C)**
XP21−024 XP21−036 XP21−048 XP21−060
Liq Vap Liq Vap Liq Vap Liq Vap
Low Stage Heating Operation
40 (4) 319 104 307 99 367 92 322 96
50 (10) 345 122 331 117 385 113 352 115
60 (16) 380 144 350 137 415 130 371 132
Low Stage Cooling Operation
65 (18) 224 149 224 145 229 142 227 139
70 (21) 241 149 241 147 247 142 244 141
75 (24) 260 150 261 148 266 143 263 142
80 (27) 281 150 282 149 288 144 284 143
85 (29) 303 151 303 150 311 145 305 144
90 (32) 325 152 326 151 334 146 328 146
95 (35) 348 154 350 152 358 147 352 147
100 (38) 372 155 374 153 383 149 376 148
105 (41) 397 156 400 154 410 150 402 150
110 (43) 425 159 427 155 438 151 429 151
115 (46) 453 155 456 157 468 152 458 153
High Stage Heating Operation
20 (−7) 312 67 293 62 326 63 305 62
30 (−1) 351 82 309 76 353 76 320 72
40 (4) 364 98 322 90 375 93 347 90
50 (10) 390 117 341 109 405 110 366 105
60 (16) 420 140 357 129 437 127 387 120
High Stage Cooling Operation
65 (18) 231 144 237 140 240 138 236 134
70 (21) 250 145 254 141 259 139 252 135
75 (24) 270 146 275 142 279 140 272 136
80 (27) 291 147 294 143 299 140 294 137
85 (29) 312 148 315 146 323 142 316 139
90 (32) 336 149 338 147 346 143 339 140
95 (35) 360 150 363 148 371 144 364 141
100 (38) 387 151 389 150 397 145 389 142
105 (41) 411 152 415 151 423 146 416 144
110 (43) 438 153 443 152 451 147 445 145
115 (46) 467 154 473 153 481 149 475 146
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