Lennox XC15-024, Руководство по установке

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Page 15
XC15 SERIES
Table 5
XC15 Normal Operating Pressures In psig (/− 10 and vapor+/− 5 PSIG)*
Model
−024 −030 −036 −042 −048 −060
5
F (
5
C)** Liquid Suction Liquid Suction Liquid Suction Liquid Suction Liquid Suction Liquid Suction
65 (18.3) 239 135 246 135 245 132 260 132 224 129 242 131
70 (21.1) 255 136 266 136 264 133 282 133 241 130 262 132
75 (23.9) 274 137 285 138 285 135 302 134 259 131 282 134
80 (26.7) 293 138 306 139 306 137 325 135 279 133 303 135
85 (29.4) 317 139 328 140 328 137 347 136 301 134 326 136
90 (32.2) 339 140 350 141 352 139 370 137 323 135 349 137
95 (35.0) 362 141 374 142 375 140 395 138 347 137 372 138
100 (37.8) 387 142 399 143 400 141 421 139 372 138 397 140
105 (40.6) 415 144 423 144 425 141 446 141 397 140 422 141
110 (43.3) 440 145 450 145 452 143 475 142 422 141 448 143
115 (46.1) 469 146 477 146 476 144 504 144 449 143 475 146
* These are typical pressures only. Indoor match up, indoor air quality, and indoor load will cause the pressures to vary.
** Temperature of air entering outdoor coil.
Charge Using Subcooling Method
Outdoor Tem-
perature > 65ºF (18ºC)
Use the following method to obtain accurate subcooling
values. Compare the measured subcooling value to the
values given in table 6.
Table 6
XC15 Subcooling Values
(psig )
_
Saturation Temperature
_
Liquid Line Temperature
=
_
Subcooling Value
Model −024 −030 −036 −042 −048 −060
°F
(°C)*
4
(2.2)
4
(2.2)
6
(3.3)
7
(3.9)
6
(3.3)
7
(3.9)
NOTE − For best results, use the same electronic thermometer to
check both outdoor-ambient and liquid-line temperatures.
*F: +/−1.0°; C: +/−0.5°
1. With the manifold gauge hose still on the liquid service
port and the unit operating stably, use a digital ther-
mometer to record the
liquid line temperature in the
space provided in table 6, and at the same time, record
the
liquid line pressure reading in the (psig___)"
space in the table.
2. Use a temperature/pressure chart for R−410A (table 7)
to determine the saturation temperature for the liq-
uid line pressure reading and record that in the space
provided in table 6.
3. Subtract the liquid line temperature from the saturation
temperature (according to the chart) to determine the
subcooling value .
4. Compare subcooling value with those in table 6. If sub-
cooling is greater than shown, recover some refriger-
ant; if less than shown, add some refrigerant.
Charge using Subcooling Method
Outdoor Tem-
perature < 65ºF (18ºC)
When the outdoor ambient temperature is below 65°F
(18°C), use the subcooling method to charge the unit. It
may be necessary to restrict the air flow through the out-
door coil to achieve pressures in the 325−375 psig
(2240−2585 kPa) range. These higher pressures are nec-
essary for checking the charge. Block equal sections of air
intake panels and move obstructions sideways until the liq-
uid pressure is in the 325−375 psig (2240−2585 kPa) range.
See figure 17.
Blocking Outdoor Coil
*Outdoor coil should be blocked one
side at a time with cardboard or plastic
sheet until proper testing pressures
are reached.
cardboard or plastic sheet
*Four−sided unit shown.
Figure 17