Operating And Temperature Pressures - Lennox Signature XC17 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.
IMPORTANT
Model −024
°F (°C)**
Liquid
65 (18.3) 234
70 (21.1) 249
75 (23.9) 268
80 (26.7) 289
85 (29.4) 310
90 (32.2) 334
95 (35.0) 358
100 (37.8) 383
105 (40.6) 408
110 (43.3) 436
115 (46.1) 465
* Typical pressures only, expressed in psig (liquid +/− 10 and vapor+/− 5 psig); indoor match up, indoor air quality, and indoor load will cause the pressures
to vary. These operating pressures are also listed on the unit charging sticker (580005−01) located on the access panel.
** Temperature of air entering outdoor coil.
°F Psig °F
32 100.8 48
33 102.9 49
34 105.0 50
35 107.1 51
36 109.2 52
37 111.4 53
38 113.6 54
39 115.8 55
40 118.0 56
41 120.3 57
42 122.6 58
43 125.0 59
44 127.3 60
45 129.7 61
46 132.2 62
47 134.6
506510−01
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Table 4. Normal Operating Pressures (Liquid +10 and Suction +5 psig)*
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.
−030
Suction Liquid Suction
139 236 134
140 251 135
141 271 138
142 291 139
142 312 140
144 335 142
145 358 142
146 383 143
147 409 144
148 436 145
150 467 147
Table 5. HFC−410A Temperature (° Fahrenheit)
Psig °F Psig °F
137.1 63 178.5
139.6 64 181.6
142.2 65 184.3
144.8 66 187.7
147.4 67 190.9
150.1 68 194.1
152.8 69 197.3
155.5 70 200.6
158.2 71 203.9
161.0 72 207.2
163.9 73 210.6
166.7 74 214.0
169.6 75 217.4
172.6 76 220.9
175.4 77 224.4
78 228.0
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−036 −042
Liquid Suction Liquid
226 134 232
245 135 249
266 137 270
287 138 291
310 139 314
333 140 338
358 141 363
383 143 389
410 144 419
437 145 447
464 146 480
Psig °F Psig
79 231.6 94 290.8
80 235.3 95 295.1
81 239.0 96 299.4
82 242.7 97 303.8
83 246.5 98 308.2
84 250.3 99 312.7
85 254.1 100 317.2
86 258.0 101 321.8
87 262.0 102 326.4
88 266.0 103 331.0
89 270.0 104 335.7
90 274.1 105 340.5
91 278.2 106 345.3
92 282.3 107 350.1
93 286.5 108 355.0
109 360.0
Page 30
−048
Suction Liquid Suction
137 232 132
139 249 133
140 268 134
141 288 135
142 311 136
143 333 137
144 357 138
145 380 139
147 406 140
148 433 142
149 462 143
Pressure (Psig)
°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
120 417.7 135 506.5
121 423.2 136 512.9
122 428.8 137 519.3
123 434.5 138 525.8
124 440.2 139 532.4
140 539.0
−060
Liquid Suction
236 131
254 132
273 133
294 135
317 136
340 137
364 139
389 140
416 142
444 143
475 145
°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