Lennox LIAC024-180P431 - Page 19

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STEP 4 - Calculate superheat value on suction valves(According to form )
Measured Suction Line Pressure = _______ PSIG
STEP 5 - Calculate subcooling value on liquid valves(According to form )
Measured Suction Line Temp. = ________ºF
Calculate superheat value = ________ºF
Measured liquid Line Pressure = _______ PSIG
Measured liquid Line Temp = ________ºF
Calculate subcooling value = ________ºF
8 10 12 14 16 18 20 2
2
40 101 97 93 89 86 82 78 7
5
42 105 101 97 93 89 86 82 7
8
44 110 105 101 97 93 89 86 8
2
46 114 110 105 101 97 93 89 8
6
48 118 114 110 105 101 97 93 8
9
50 123 118 114 110 105 101 97 9
3
52 128 123 118 114 110 105 101 9
7
54 133 128 123 118 114 110 105 10
1
56 138 133 128 123 118 114 110 10
5
58 143 138 133 128 123 118 114 11
0
60 148 143 138 133 128 123 118 11
4
62 153 148 143 138 133 128 123 11
8
64 159 153 148 143 138 133 128 12
3
66 164 159 153 148 143 138 133 12
8
68 170 164 159 153 148 143 138 13
3
70 176 170 164 159 153 148 143 13
8
72 182 176 170 164 159 153 148 143
R-410A REFRIGERAN CHART
FINAL SUPERHEAT(
℉
)
SUCTION GAGE PRESSURE (PSI)
SUCTIO
N
TEMP
(
℉
)
6 7 8 9 10 11 12 13
55 173 176 179 182 185 188 191 19
5
60 188 191 195 198 201 204 208 21
1
65 204 208 211 215 218 221 225 22
9
70 221 225 229 232 236 239 243 24
7
75 239 243 247 251 255 259 262 26
6
80 259 262 266 270 275 279 283 28
7
85 279 283 287 291 295 300 304 30
9
90 300 304 309 313 318 322 327 33
1
95 322 327 331 336 341 346 351 35
5
100 346 351 355 360 365 370 376 38
1
105 370 376 381 386 391 397 402 40
7
110 397 402 407 413 418 424 430 43
5
115 424 430 435 441 447 453 459 46
5
120 453 459 465 471 477 483 489 49
6
125 483 489 496 502 508 515 521 52
8
R-410A REFRIGERAN CHART
FINALSUBCOOLING(℉)
LIQUID GAGE PRESSURE (PSI)
SUCTIO
N
TEMP
(℉)
107℉
107℉
Note: If calculated subcooling value is lower than the design
subcooling value, please add refrigerant. Repeat the steps above.
Note:Make sure the superheat value of suction valve
should be above 12ºF, if the value is lower than this,
indoor TXV should be adjusted.If the temperature is
higher than 18ºF, we suggest to adjust indoor TXV.
Repeat the steps above.
(If to adjust TXV ,steps of
adjustment are shown on
separate sheet , and
repeat this step.)
Model
Design subcooling
24 36 48 60
10ºF 10ºF 8ºF 7ºF