System Operation; Maintenance - Lennox Elite XC13 Installation Instructions Manual

Table 4. Normal Operating Pressures (Liquid +10 and Suction +5 psig)
IMPORTANT
XC13
5F (5C) *
Expansion Valve
65 (18)
70 (21)
75 (24)
80 (26)
85 (29)
90 (32)
95 (35)
100 (38)
105 (41)
110 (43)
115 (46)
Fixed Orifice
65 (18)
70 (21)
75 (24)
80 (26)
85 (29)
90 (32)
95 (35)
100 (38)
105 (41)
110 (43)
115 (46)
*Temperature of the air entering the outside coil.
**Typical pressures; indoor unit match up, indoor air quality equipment, and indoor load causes pressure variance

System Operation

The outdoor unit and indoor blower cycle on demand from
the room thermostat. When the thermostat blower switch
is in the ON position, the indoor blower operates
continuously.
HIGH PRESSURE SWITCH
XC13 units are equipped with a high-pressure switch that
is located in the liquid line of the compressor as illustrated
in Unit Dimensions on page 2. The switch is a Single Pole,
Single Throw (SPST), manual−reset switch with red cap
that is normally closed and removes power from the
compressor when discharge pressure rises above factory
setting at 590 + 10 psi.
DISCHARGE THERMOSTAT
Each XC13 unit is equipped with a discharge thermostat
located in the discharge line of the compressor. The switch
(SPST, auto−reset, normally closed) and removes power
from the compressor when discharge temperature
exceeds the factory setting of 220
506120−01 03/10
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.
−018 −024
233 / 132 244 / 137
251 / 133 263 / 138
265 / 133 285 / 139
292 / 135 307 / 140
314 / 136 329 / 141
338 / 137 354 / 142
362 / 138 379 / 143
388 / 140 404 / 144
415 / 141 438 / 145
444 / 142 464 / 147
475 / 143 495 / 148
233 / 121 246 / 126
250 / 124 265 / 129
270 / 128 286 / 132
291 / 131 307 / 135
313 / 134 330 / 137
335 / 136 353 / 140
359 / 138 378 / 142
383 / 140 402 / 143
409 / 142 428 / 145
436 / 145 456 / 147
464 / 147 486 / 149
º º
F +5 F.
−030 −036
Liquid Line Pressure / Vapor Line Pressure **
248 / 127 263 / 135
263 / 131 281 / 138
284 / 132 302 / 140
307 / 134 325 / 142
330 / 135 349 / 142
355 / 136 375 / 143
380 / 137 404 / 144
407 / 138 433 / 145
434 / 139 462 / 147
465 / 141 494 / 149
497 / 142 527 / 150
245 / 123 261 / 134
265 / 126 281 / 136
286 / 129 301 / 138
308 / 132 324 / 140
331 / 135 346 / 142
355 / 138 371 / 144
380 / 140 396 / 146
405 / 142 422 / 148
431 / 144 448 / 150
458 / 146 477 / 151
487 / 148 506 / 153
FILTER DRIER
A filter drier is factory-installed as illustrated in Unit
Dimensions on page 2, with each XC13 unit to ensure a
clean, moisture−free system. A replacement filter drier is
available from Lennox. Refer to Lennox Repair Part
Program.

Maintenance

Improper
service or maintenance can cause personal injury,
loss of life, or damage to property.
Installation and service must be performed by a
licensed professional installer (or equivalent) or a
service agency.
At the beginning of each cooling season, the system
should be checked as follows:
1. Clean and inspect the outdoor coil. The coil may be
flushed with a water hose. Ensure the power is turned
off before you clean the coil.
Page 26
−042 −048
235 / 128 235 / 132
249 / 129 254 / 132
268 / 130 276 / 134
290 / 132 298 / 134
313 / 133 323 / 135
337 / 134 350 / 137
364 / 134 377 / 138
389 / 135 406 / 140
416 / 136 430 / 141
445 / 137 464 / 142
473 / 139 495 / 143
236 / 119 247 / 125
250 / 121 266 / 128
269 / 124 286 / 131
290 / 127 307 / 133
312 / 130 329 / 135
334 / 133 353 / 138
360 / 136 377 / 140
385 / 139 403 / 142
413 / 141 428 / 144
438 / 143 455 / 146
466 / 145 483 / 147
WARNING
installation, adjustment,
−060
241 / 130
260 / 130
280 / 132
299 / 134
321 / 135
344 / 134
371 / 135
400 / 137
428 / 139
458 / 141
484 / 142
248 / 124
266 / 126
288 / 130
309 / 133
330 / 135
354 / 138
377 / 140
406 / 142
431 / 144
457 / 146
484 / 148
alteration,