Operating And Temperature Pressures - Lennox XC17 Series Unit Information

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
Table 4. Normal Operating Pressures (Liquid +10 and Suction +5 psig)*
Model −024
F (C)**
Liquid Suction
65 (18.3) 234 139
70 (21.1) 249 140
75 (23.9) 268 141
80 (26.7) 289 142
85 (29.4) 310 142
90 (32.2) 334 144
95 (35.0) 358 145
100 (37.8) 383 146
105 (40.6) 408 147
110 (43.3) 436 148
115 (46.1) 465 150
65 (18.3) 234 139
70 (21.1) 249 140
75 (23.9) 268 141
80 (26.7) 289 142
85 (29.4) 310 142
90 (32.2) 334 144
95 (35.0) 358 145
100 (37.8) 383 146
105 (40.6) 408 147
110 (43.3) 436 148
115 (46.1) 465 150
* 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
−40
−35
−30
−25
−20
−15
−10
−5
0
5
10
15
20
25
30
35
40
45
50
55
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.
(XC17−XXX−230−01 and −02)
−030
Liquid Suction Liquid
236 134 226
251 135 245
271 138 266
291 139 287
312 140 310
335 142 333
358 142 358
383 143 383
409 144 410
436 145 437
467 147 464
(XC17−XXX−230−03)
236 134 226
251 135 245
271 138 266
291 139 287
312 140 310
335 142 333
358 142 358
383 143 383
409 144 410
436 145 437
467 147 464
Table 5. HFC−410A Temperature (°F) − Pressure (Psig)
°C Psig
−40.0 11.6
−37.2 14.9
−34.4 18.5
−31.7 22.5
−28.9 26.9
−26.1 31.7
−23.3 36.8
−20.6 42.5
−17.8 48.6
−15.0 55.2
−12.2 62.3
−9.4 70.0
−6.7 78.3
−3.9 87.3
−1.1 96.8
1.7 107
4.4 118
7.2 130
10.0 142
12.8 155
−036 −042
Suction Liquid Suction
134 232 137
135 249 139
137 270 140
138 291 141
139 314 142
140 338 143
141 363 144
143 389 145
144 419 147
145 447 148
146 480 149
134 232 137
135 249 139
137 270 140
138 291 141
139 314 142
140 338 143
141 363 144
143 389 145
144 419 147
145 447 148
146 480 149
°F
60
65
70
75
80
85
90
95
100
105
110
115
120
125
130
135
140
145
150
Page 31
−048 −060
Liquid Suction Liquid
232 132 236
249 133 254
268 134 273
288 135 294
311 136 317
333 137 340
357 138 364
380 139 389
406 140 416
433 142 444
462 143 475
232 132 237
249 133 255
268 134 275
288 135 296
311 136 320
333 137 343
357 138 367
380 139 391
406 140 418
433 142 447
462 143 478
°C Psig
15.6 170
18.3 185
21.1 201
23.9 217
26.7 235
29.4 254
32.2 274
35.0 295
37.8 317
40.6 340
43.3 365
46.1 391
48.9 418
51.7 446
54.4 476
57.2 507
60.0 539
62.8 573
65.6 608
Suction
131
132
133
135
136
137
139
140
142
143
145
136
137
138
139
141
142
143
144
146
147
149
XC17