Operating And Temperature Pressures - Lennox XP21 Series Installation Instructions Manual

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.
5F (5C)**
40 (4)
50 (10)
60 (16)
65 (18)
70 (21)
75 (24)
80 (27)
85 (29)
90 (32)
95 (35)
100 (38)
105 (41)
110 (43)
115 (46)
20 (−7)
30 (−1)
40 (4)
50 (10)
60 (16)
65 (18)
70 (21)
75 (24)
80 (27)
85 (29)
90 (32)
95 (35)
100 (38)
105 (41)
110 (43)
115 (46)
Table 8. Normal Operating Pressure − Liquid +10 and Vapor +5 PSIG*
XP21−024
Liq Vap
Low Stage
319 104
345 122
380 144
Low Stage
224 149
241 149
260 150
281 150
303 151
325 152
348 154
372 155
397 156
425 159
453 155
High Stage
312 67
351 82
364 98
390 117
420 140
High Stage
231 144
250 145
270 146
291 147
312 148
336 149
360 150
387 151
411 152
438 153
467 154
XP21−036
Liq Vap
Heating Operation
307 99
331 117
350 137
Cooling Operation
224 145
241 147
261 148
282 149
303 150
326 151
350 152
374 153
400 154
427 155
456 157
Heating Operation
293 62
309 76
322 90
341 109
357 129
Cooling Operation
237 140
254 141
275 142
294 143
315 146
338 147
363 148
389 150
415 151
443 152
473 153
Page 31
XP21−048
Liq Vap
367 92
385 113
415 130
229 142
247 142
266 143
288 144
311 145
334 146
358 147
383 149
410 150
438 151
468 152
326 63
353 76
375 93
405 110
437 127
240 138
259 139
279 140
299 140
323 142
346 143
371 144
397 145
423 146
451 147
481 149
XP21−060
Liq Vap
322 96
352 115
371 132
227 139
244 141
263 142
284 143
305 144
328 146
352 147
376 148
402 150
429 151
458 153
305 62
320 72
347 90
366 105
387 120
236 134
252 135
272 136
294 137
316 139
339 140
364 141
389 142
416 144
445 145
475 146
XP21 SERIES