System Operation - Lennox Elite XC16−024−230 Installation Instructions Manual

°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
Table 4. Normal Operating Pressures (Liquid +10 and Suction +5 psig)
IMPORTANT
Temp. of air
−024
entering
outdoor coil
5F (5C)
Liquid
65 (18.3) 215
75 (23.9) 247
85 (29.4) 288
95 (35.0) 332
105 (40.6) 381
115 (46.1) 435
65 (18.3) 225
75 (23.9) 258
85 (29.4) 301
95 (35.0) 346
105 (40.6) 397
115 (46.1) 452
*These are typical pressures only. Indoor indoor match up, indoor air quality, and indoor load will cause the pressures to vary.

System Operation

TWO−STAGE COMPRESSOR
The two−stage scroll compressor operates much like the
standard scroll compressor. The two−stage compressor
steps between low capacity and high capacity as required
to meet cooling demand. The steps occur when gas is
bypassed through a vent port in the first suction pocket.
This bypassing of gas allows the compressor to operate at
low capacity if thermostat demand allows, creating a more
cost effective and efficient compressor.
Table 3. 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
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.
−036
Suction Liquid
First Stage (Low Capacity)
144 226
146 261
148 304
151 352
153 405
155 460
Second Stage (High Capacity)
140 228
142 262
144 306
146 353
149 405
151 462
Psig °F Psig °F
231.6 94 290.8 110
235.3 95 295.1 111
239.0 96 299.4 112
242.7 97 303.8 113
246.5 98 308.2 114
250.3 99 312.7 115
254.1 100 317.2 116
258.0 101 321.8 117
262.0 102 326.4 118
266.0 103 331.0 119
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
−048
Suction Liquid
142 224
144 258
145 299
147 345
150 395
150 450
144 235
146 269
148 313
150 361
151 412
154 471
Full capacity is achieved by blocking the vent port with a
slider ring. The slider ring (vent port cover) is controlled by
a 24VDC internal solenoid in the open position allowing low
capacity. When energized the internal solenoid closes the
slider ring, blocking the vent port and bringing the
compressor to full capacity. Stepping can occur during a
single thermostat demand as the motor runs continuously
while the compressor steps from low to full capacity.
Page 25
Psig °F Psig
365.0 125 445.9 141
370.0 126 451.8 142
375.1 127 457.6 143
380.2 128 463.5 144
385.4 129 469.5 145
390.7 130 475.6 146
396.0 131 481.6 147
401.3 132 487.8 148
406.7 133 494.0 149
412.2 134 500.2 150
417.7 135 506.5 151
423.2 136 512.9 152
428.8 137 519.3 153
434.5 138 525.8 154
440.2 139 532.4 155
140 539.0
−060
Suction Liquid
142 215
144 250
146 291
148 337
150 388
153 444
135 220
137 256
139 299
141 347
143 402
146 462
°F Psig
545.6
552.3
559.1
565.9
572.8
579.8
586.8
593.8
601.0
608.1
615.4
622.7
630.1
637.5
645.0
Suction
136
139
142
144
146
148
130
133
136
138
141
143
XC16 SERIES