Operating And Temperature Pressures - Lennox Signature XP21 Series Installation And Service Procedure

Operating and Temperature Pressures (All Builds)
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.
XP21−024−230−ALL
5F (5C)**
Liq Vap
40 (4) 319 104
50 (10) 345 122
60 (16) 380 144
65 (18) 224 149
70 (21) 241 149
75 (24) 260 150
80 (27) 281 150
85 (29) 303 151
90 (32) 325 152
95 (35) 348 154
100 (38) 372 155
105 (41) 397 156
110 (43) 425 159
115 (46) 453 155
20 (−7) 312
30 (−1) 351
40 (4) 364
50 (10) 390 117
60 (16) 420 140
65 (18) 231 144
70 (21) 250 145
75 (24) 270 146
80 (27) 291 147
85 (29) 312 148
90 (32) 336 149
95 (35) 360 150
100 (38) 387 151
105 (41) 411 152
110 (43) 438 153
115 (46) 467 154
°F Psig °F Psig
32 100.8 48 137.1
33 102.9 49 139.6
34 105.0 50 142.2
35 107.1 51 144.8
36 109.2 52 147.4
37 111.4 53 150.1
38 113.6 54 152.8
39 115.8 55 155.5
40 118.0 56 158.2
41 120.3 57 161.0
42 122.6 58 163.9
43 125.0 59 166.7
44 127.3 60 169.6
45 129.7 61 172.6
46 132.2 62 175.4
47 134.6
XP21
Table 8. Normal Operating Pressure − Liquid +10 and Vapor +5 PSIG*
XP21−036−230−ALL
Liq Vap
Low Stage
307 99
331 117
350 137
Low Stage
224 145
241 147
261 148
282 149
303 150
326 151
350 152
374 153
400 154
427 155
456 157
High Stage
67 293 62
82 309 76
98 322 90
341 109
357 129
High Stage
237 140
254 141
275 142
294 143
315 146
338 147
363 148
389 150
415 151
443 152
473 153
.
Table 9 HFC−410A Temperature (°F) − Pressure (Psig)
°F Psig °F
63 178.5 79
64 181.6 80
65 184.3 81
66 187.7 82
67 190.9 83
68 194.1 84
69 197.3 85
70 200.6 86
71 203.9 87
72 207.2 88
73 210.6 89
74 214.0 90
75 217.4 91
76 220.9 92
77 224.4 93
78 228.0
XP21−048−230−ALL XP21−060−230−01 Only
Liq Vap
Heating Operation
367 92
385 113
415 130
Cooling Operation
229 142
247 142
266 143
288 144
311 145
334 146
358 147
383 149
410 150
438 151
468 152
Heating Operation
326 63
353 76
375 93
405 110
437 127
Cooling Operation
240 138
259 139
279 140
299 140
323 142
346 143
371 144
397 145
423 146
451 147
481 149
Psig °F Psig °F
231.6 94 290.8 110
235.3 95 295.1 111
239.0 96 299.4 112
242.7 97 303.8 113
246.5 98 308.2 114
250.3 99 312.7 115
254.1 100 317.2 116
258.0 101 321.8 117
262.0 102 326.4 118
266.0 103 331.0 119
270.0 104 335.7 120
274.1 105 340.5 121
278.2 106 345.3 122
282.3 107 350.1 123
286.5 108 355.0 124
109 360.0
Page 30
XP21−060−230−02 and
Liq Vap Liq
371 93 322
402 111 352
428 128 371
235 138 227
253 139 244
273 140 263
294 141 284
317 143 305
340 144 328
364 145 352
390 146 376
417 147 402
445 149 429
476 150 458
340 59 305
353 68 320
373 89 347
404 104 366
429 121 387
247 131 236
268 133 252
286 134 272
308 137 294
327 143 316
350 144 339
374 146 364
401 147 389
428 148 416
458 149 445
489 151 475
Psig °F Psig
365.0
125 445.9
370.0 126 451.8
375.1 127 457.6
380.2 128 463.5
385.4 129 469.5
390.7 130 475.6
396.0 131 481.6
401.3 132 487.8
406.7 133 494.0
412.2 134 500.2
417.7 135 506.5
423.2 136 512.9
428.8 137 519.3
434.5 138 525.8
440.2 139 532.4
140 539.0
Later
Vap
96
115
132
139
141
142
143
144
146
147
148
150
151
153
62
72
90
105
120
134
135
136
137
139
140
141
142
144
145
146
°F Psig
141 545.6
142 552.3
143 559.1
144 565.9
145 572.8
146 579.8
147 586.8
148 593.8
149 601.0
150 608.1
151 615.4
152 622.7
153 630.1
154 637.5
155 645.0