Product data

Performance data
Computerized ratings
Becauseof the large number ofavailableCarrier 23XL Screw
Chiller component combinations and the wide variability in
required operating conditions, it is impractical to provide
tabular performance information. Tabulated performance
ratings predict ‘‘typical’’ chiller performance. Actual chiller
performance may vary significantly at actual operating con-
ditionsand as chillercomponentsare optimized aroundthese
conditions.
Computerized performance ratings are available through
your local Carrier sales representative. These ratings are
custom matched to meet project-specific operating condi-
tions and energy efficiency requirements.
ARI Certification Program
The computerized performance ratings of the Carrier 23XL
Screw Chiller are certified by the Air Conditioning and Re-
frigeration Institute (ARI). The Certification Program re-
quires that the manufacturer’s ratings be regularly checked
for accuracy through a program of chiller testing in strict
compliance with ARI Standard 550. This independent veri-
fication provides assurance of chiller performance.
Part-load performance
Frequently, a chiller will operate at part-load for a large ma-
jority of its total operating hours. In some cases, a chiller
with better part-load performance will offer an annualized
operating cost advantage over one which performs less ef-
ficiently at lower loads.
Established by ARI, the Integrated Part-Load Value (IPLV)
is a weighted average of kW/ton values over a wide range
ofchiller operation. The IPLV provides a convenientmethod
of comparing the part-load performance of different chill-
ersat standardizedtypical conditions.The IPLVrating method
has been incorporated into the ARI Certification Program.
The 23XL Screw Chiller computerized ratings are certified
in accordance with this program.
Variables such as local weather data, building load pro-
files, and local utility rate structures may significantly alter
the impact of part-load performance on actual operating
cost. Any operating cost analysis should include all factors
relevant to a particular application.
Application data
HEAT EXCHANGER MINIMUM/MAXIMUM FLOW RATES*
ENGLISH (gpm)
COOLER 1 PASS 2 PASS 3 PASS
Frame Size Min Max Min Max Min Max
1
10 513 2053 257 1027 171 685
11 645 2582 323 1290 215 861
2
20 689 2758 345 1379 230 919
21 813 3250 406 1625 271 1084
4
40 590 2359 295 1179 197 786
41 666 2663 333 1332 222 888
42 754 3016 377 1508 251 1005
43 851 3403 425 1701 284 1134
CONDENSER 1 PASS 2 PASS 3 PASS
Frame Size Min Max Min Max Min Max
1
10 619 2476 310 1238 206 826
11 729 2915 364 1457 243 972
2
20 788 3151 394 1576 263 1051
21 948 3793 474 1896 316 1265
4
40 613 2454 307 1227 205 818
41 692 2769 346 1384 231 923
42 785 3141 393 1570 262 1047
43 886 3546 443 1773 295 1182
*Flow rates based on standard tubes, cooler, and condenser. Minimum
flow based on tube velocity of 3 ft/sec (0.9 m/sec); maximum based on
12 ft/sec (3.6 m/sec).
SI METRIC (L/s)
COOLER 1 PASS 2 PASS 3 PASS
Frame Size Min Max Min Max Min Max
1
10 32 129 16 65 11 43
11 41 163 20 81 13 54
2
20 43 174 22 87 14 58
21 51 205 25 102 17 68
4
40 37 149 18 74 12 50
41 42 168 21 84 14 56
42 47 190 24 95 16 63
43 54 215 27 107 18 71
CONDENSER 1 PASS 2 PASS 3 PASS
Frame Size Min Max Min Max Min Max
1
10 39 156 19 78 13 52
11 46 184 23 92 15 61
2
20 50 198 25 99 16 66
21 60 239 30 119 20 80
4
40 38 154 19 77 13 51
41 43 175 22 87 14 58
42 50 198 25 99 16 66
43 55 223 28 111 18 74
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