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TABLE 6
Normal Operating Pressures (Liquid +10 and Suction +5 psig)
IMPORTANT
Use this table to perform maintenance checks; it is not a procedure for charging
the system. Minor variations in these pressures may be due to differences in
installations. Significant deviations could mean that the system is not properly
charged or that a problem exists with some component in the system.
Model −018 −024 −030 −036 −042 −048 −060
**Temp.
5F (5C)
Liquid / Vapor Liquid / Suction Liquid / Suction Liquid / Suction Liquid / Vapor Liquid / Vapor Liquid / Vapor
Expansion Valve (TXV)
65 (18) 230 / 138 225 / 135 226 / 129 238 / 132 236 / 138 238 / 136 239 / 133
70 (21) 244 / 139 242 / 137 241 / 131 254 / 135 253 / 140 256 / 138 258 / 135
75 (24) 265 / 140 260 / 138 259 / 134 273 / 138 273 / 141 277 / 139 278 / 136
80 (27) 286 / 140 282 / 140 281 / 138 293 / 140 296 / 142 299 / 140 300 / 137
85 (29) 307 / 142 304 / 141 301 / 140 316 / 142 318 / 143 320 / 139 323 / 138
90 (32) 330 / 143 326 / 142 324 / 141 340 / 143 341 / 144 343 / 140 346 / 139
95 (35) 351 / 144 351 / 142 348 / 142 366 / 144 366 / 146 369 / 141 370 / 140
100 (38) 380 / 144 376 / 144 372 / 143 392 / 145 392 / 147 395 / 142 396 / 142
105 (41) 407 / 145 403 / 145 399 / 144 420 / 147 417 / 148 422 / 144 415 / 143
110 (43) 436 / 146 433 / 145 428 / 145 449 / 148 445 / 149 450 / 146 449 / 145
115 (45) 466 / 147 463 / 147 456 / 146 480 / 149 475 / 151 481 / 148 476 / 147
Fixed Orifice (RFC)
65 (18) 232 / 124 228 / 125 229 / 128 241 / 131 248 / 135 240 / 126 244 / 125
70 (21) 248 / 127 244 / 127 243 / 129 258 / 134 266 / 138 260 / 129 263 / 128
75 (24) 267 / 131 261 / 131 261 / 132 277 / 136 285 / 141 281 / 133 281 / 131
80 (27) 286 / 135 284 / 134 284 / 135 298 / 139 305 / 143 301 / 135 303 / 134
85 (29) 307 / 138 303 / 137 305 / 138 321 / 141 327 / 145 324 / 138 324 / 136
90 (32) 328 / 141 325 / 140 327 / 140 342 / 143 349 / 147 346 / 140 347 / 139
95 (35) 351 / 143 347 / 142 349 / 142 366 / 145 372 / 149 371 / 142 370 / 141
100 (38) 375 / 146 370 / 144 372 / 144 392 / 147 396 / 150 395 / 144 394 / 143
105 (41) 400 / 148 394 / 146 396 / 146 416 / 149 421 / 152 420 / 146 418 / 145
110 (43) 426 / 150 420 / 148 422 / 148 446 / 151 447 / 153 447 / 148 444 / 146
115 (46) 457 / 153 447 / 150 449 / 150 480 / 152 476 / 154 473 / 150 471 / 147
*Values shown are typical pressures; indoor unit match up, indoor air quality equipment, and indoor load will cause the pressures to vary.
**Temperature of the air entering the outside coil.
TABLE 7
HFC−410A Temperature (°F) − Pressure (Psig)
°F
Psig °F Psig °F Psig °F Psig °F Psig °F Psig °F Psig °F Psig
32 100.8 48 137.1 63 178.5 79 231.6 94 290.8 110 365.0
125 445.9
141 545.6
33 102.9 49 139.6 64 181.6 80 235.3 95 295.1 111 370.0 126 451.8 142 552.3
34 105.0 50 142.2 65 184.3 81 239.0 96 299.4 112 375.1 127 457.6 143 559.1
35 107.1 51 144.8 66 187.7 82 242.7 97 303.8 113 380.2 128 463.5 144 565.9
36 109.2 52 147.4 67 190.9 83 246.5 98 308.2 114 385.4 129 469.5 145 572.8
37 111.4 53 150.1 68 194.1 84 250.3 99 312.7 115 390.7 130 475.6 146 579.8
38 113.6 54 152.8 69 197.3 85 254.1 100 317.2 116 396.0 131 481.6 147 586.8
39 115.8 55 155.5 70 200.6 86 258.0 101 321.8 117 401.3 132 487.8 148 593.8
40 118.0 56 158.2 71 203.9 87 262.0 102 326.4 118 406.7 133 494.0 149 601.0
41 120.3 57 161.0 72 207.2 88 266.0 103 331.0 119 412.2 134 500.2 150 608.1
42 122.6 58 163.9 73 210.6 89 270.0 104 335.7 120 417.7 135 506.5 151 615.4
43 125.0 59 166.7 74 214.0 90 274.1 105 340.5 121 423.2 136 512.9 152 622.7
44 127.3 60 169.6 75 217.4 91 278.2 106 345.3 122 428.8 137 519.3 153 630.1
45 129.7 61 172.6 76 220.9 92 282.3 107 350.1 123 434.5 138 525.8 154 637.5
46 132.2 62 175.4 77 224.4 93 286.5 108 355.0 124 440.2 139 532.4 155 645.0
47 134.6 78 228.0 109 360.0 140 539.0
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