Operating And Temperature Pressures - Lennox XC21 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)* (−04 build)
−024
5F (5C)**
Liquid
65 (18.3) 208
75 (23.9) 242
85 (29.4) 278
95 (35.0) 323
105 (40.6) 367
115 (46.1) 421
65 (18.3) 209
75 (23.9) 242
85 (29.4) 274
95 (35.0) 325
105 (40.6) 373
115 (46.1) 419
65 (18.3) 209
75 (23.9) 242
85 (29.4) 281
95 (35.0) 324
105 (40.6) 372
115 (46.1) 426
65 (18.3) 213
75 (23.9) 245
85 (29.4) 285
95 (35.0) 329
105 (40.6) 376
115 (46.1) 432
* 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 (401104S) located on the unit access panel.
** Temperature of air entering outdoor coil.
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.
XC21−XXX−230−04 Only
−036
Vapor Liquid
First Stage (Low Capacity)
143 214
145 247
147 288
150 333
153 383
155 441
Second Stage (High Capacity)
139 218
140 252
142 294
145 339
147 389
149 447
XC21−XXX−230−05 and later
First Stage (Low Capacity)
144 211
145 244
146 285
148 330
151 380
152 436
Second Stage (High Capacity)
138 214
142 247
142 288
144 330
147 384
151 445
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−048
Vapor Liquid
146 216
149 246
151 288
154 336
155 385
156 444
141 220
141 254
144 297
147 344
150 394
152 452
142 215
144 250
146 288
149 338
151 387
154 459
137 217
140 251
141 289
143 336
145 385
148 437
−060
Vapor Liquid
142 232
144 269
146 310
147 357
149 405
153 459
137 236
139 281
141 323
144 370
144 421
147 476
140 229
142 264
144 306
146 353
149 405
152 468
124 238
133 276
138 317
141 368
144 420
146 478
Vapor
137
138
140
144
145
149
138
133
135
138
141
144
134
137
140
144
146
146
130
133
135
139
141
143
XC21