Lennox Elite Series XP13 Units Installation Instructions Manual page 21

Table 4. Normal Operating Pressures − Liquid +10 and Vapor +5 PSIG*
Use table 4 as a general guide when performing maintenance checks. This is not a procedure for charging the
unit (Refer to Charging / Checking Charge section). 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.
Model −018
ºF (ºC)** Liquid Line Pressure / Vapor Line Pressure
Cooling Operation
65 (18) 228 / 140
75 (24) 265 / 142
85 (29) 311 / 144
95 (35) 350 / 147
105 (41) 402 / 149
115 (45) 458 / 152
Heating Operation
60 (16) 350 / 135
50 (10) 321 / 116
40 (4.5) 301 / 96
30 (−1) 294 / 81
20 (−7) 278 / 64
*These are most−popular−match−up pressures. Indoor match up, indoor air quality, and indoor load cause pressures to vary.
**Temperature of the air entering the outdoor coil.
°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
IMPORTANT
−024 −030
232 / 139 245 / 135
268 / 142 284 / 137
317 / 144 328 / 140
366 / 146 377 / 144
412 / 148 429 / 145
464 / 152 486 / 147
348 / 130 341 / 123
330 / 109 324 / 107
315 / 89 307 / 88
301 / 77 290 / 76
286 / 64 274 / 62
Table 5. 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
−036 −042
251 / 134
292 / 138
339 / 140
392 / 143
443 / 145
508 / 149
350 / 131
331 / 111
304 / 96
295 / 77
290 / 62
Psig °F Psig
231.6 94 290.8
235.3 95 295.1
239.0 96 299.4
242.7 97 303.8
246.5 98 308.2
250.3 99 312.7
254.1 100 317.2
258.0 101 321.8
262.0 102 326.4
266.0 103 331.0
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 21
−048
239 / 135 244 / 139
277 / 136 283 / 141
321 / 139 318 / 143
379 / 142 369 / 145
423 / 144 420 / 148
484 / 147 484 / 150
366 / 129 350 / 120
348 / 107 333 / 106
336 / 89 294 / 92
317 / 70 291 / 73
295 / 60 283 / 59
°F Psig °F Psig
110 365.0
125 445.9
111 370.0 126 451.8
112 375.1 127 457.6
113 380.2 128 463.5
114 385.4 129 469.5
115 390.7 130 475.6
116 396.0 131 481.6
117 401.3 132 487.8
118 406.7 133 494.0
119 412.2 134 500.2
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
−060
248 / 129
289 / 131
336 / 132
385 / 133
440 / 136
500 / 140
379 / 127
361 / 109
341 / 89
323 / 72
305 / 59
°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
XP13 SERIES