Lennox XC21 User Manual

Page 29
XC21 SERIES
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.
Table 4. Normal Operating Pressures (Liquid +10 and Suction +5 psig)*
IMPORTANT
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 −024 −036 −048 −060
5F (5C)** Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor
First Stage (Low Capacity)
65 (18.3)
209 144 211 142 215 140 229 134
75 (23.9)
242 145 244 144 250 142 264 137
85 (29.4)
281 146 285 146 288 144 306 140
95 (35.0)
324 148 330 149 338 146 353 144
105 (40.6)
372 151 380 151 387 149 405 146
115 (46.1)
426 152 436 154 459 152 468 146
Second Stage (High Capacity)
65 (18.3)
213 138 214 137 217 124 238 130
75 (23.9)
245 142 247 140 251 133 276 133
85 (29.4)
285 142 288 141 289 138 317 135
95 (35.0)
329 144 330 143 336 141 368 139
105 (40.6)
376 147 384 145 385 144 420 141
115 (46.1)
432 151 445 148 437 146 478 143
* 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.
Table 5. HFC−410A Temperature (°F) − Pressure (Psig)
°F °C Psig °F °C Psig
−40 −40.0 11.6 60 15.6 170
−35 −37.2 14.9 65 18.3 185
−30 −34.4 18.5 70 21.1 201
−25 −31.7 22.5 75 23.9 217
−20 −28.9 26.9 80 26.7 235
−15 −26.1 31.7 85 29.4 254
−10 −23.3 36.8 90 32.2 274
−5 −20.6 42.5 95 35.0 295
0 −17.8 48.6 100 37.8 317
5 −15.0 55.2 105 40.6 340
10 −12.2 62.3 110 43.3 365
15 −9.4 70.0 115 46.1 391
20 −6.7 78.3 120 48.9 418
25 −3.9 87.3
125 51.7 446
30 −1.1 96.8 130 54.4 476
35 1.7 107 135 57.2 507
40 4.4 118 140 60.0 539
45 7.2 130
145 62.8 573
50 10.0 142
150 65.6 608
55 12.8 155

Lennox XC21 Specifications

General

SEER Rating	up to 21.00
Sound Rating	as low as 69 dB
Refrigerant	R-410A
Energy Star Certified	Yes
Compressor Type	Two-Stage
Cooling Capacity (BTU/h)	24000-54000
Warranty	10-Year Limited Warranty on compressor