188
PERFORMANCE DATA — 579F (cont)
COOLING CAPACITIES (cont)
LEGEND
NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
Where: h
ewb
= Enthalpy of air entering evaporator coil
3. The SHC is based on 80 F edb temperature of air entering evaporator coil.
Below 80 F edb, subtract (corr factor x cfm) from SHC.
Above 80 F edb, add (corr factor x cfm) to SHC
.
Interpolation is permissible.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).
579F240 (20 Tons) (cont)
Temp (F)
Air Entering
Condenser
(Edb)
Evaporator Air Quantity — Cfm
10,000
Evaporator Air — Ewb (F)/BF
54/0.65
58/0.52
62/0.40
67/0.26
72/0.24
76/0.24
80/0.04
75
TC
250
250
256
267
294
314
—
SHC
250
250
227
200
161
127
—
kW
15.8
15.8
15.9
16.1
16.7
17.1
—
85
TC
243
244
249
262
284
303
—
SHC
243
244
220
198
158
124
—
kW
17.6
17.8
17.7
18.0
18.5
18.9
—
95
TC
236
236
241
252
274
292
—
SHC
236
236
212
194
154
121
—
kW
19.5
19.5
19.7
19.9
20.4
20.9
—
105
TC
228
228
234
242
263
281
—
SHC
228
228
203
190
151
117
—
kW
21.6
21.6
21.8
22.0
22.5
22.9
—
115
TC
220
220
223
232
251
268
—
SHC
220
220
207
186
147
113
—
kW
23.9
23.9
23.9
24.2
24.7
25.2
—
117
TC
218
218
221
230
249
266
—
SHC
218
218
205
185
146
112
—
kW
24.3
24.3
24.4
24.7
25.2
25.6
—
120
TC
215
215
218
226
245
—
—
SHC
215
215
203
183
145
—
—
kW
25.1
25.1
25.1
25.4
25.9
—
—
BF
—
Bypass Factor
Edb
—
Entering Dry-Bulb
Ewb
—
Entering Wet-Bulb
kW
—
Compressor Motor Power Input
ldb
—
Leaving Dry-Bulb
lwb
—
Leaving Wet-Bulb
SHC
—
Sensible Heat Capacity (1000 Btuh) Gross
TC
—
Total Capacity (1000 Btuh) Gross
t
ldb
=
t
edb
–
sensible capacity (Btuh)
1.10 x cfm
t
lwb
=
Wet-bulb temperature corresponding to enthalpy of air
leaving evaporator coil (h
lwb
)
h
lwb
=
h
ewb
–
total capacity (Btuh)
4.5 x cfm
BYPASS
FACTOR
(BF)
ENTERING AIR DRY-BULB TEMP (F)
79
78
77
76
75
under 75
81
82
83
84
85
over 85
Correction Factor
0.05
1.04
2.07
3.11
4.14
5.18
Use formula
shown below.
0.10
0.98
1.96
2.94
3.92
4.91
0.20
0.87
1.74
2.62
3.49
4.36
0.30
0.76
1.53
2.29
3.05
3.82
0.40
0.65
1.31
1.96
2.62
3.27
0.50
0.55
1.09
1.64
2.18
2.73
0.60
0.44
0.87
1.31
1.74
2.18
0.70
0.33
0.65
0.98
1.31
1.64
Summary of Contents for 581A
Page 30: ...30 BASE UNIT DIMENSIONS 580F036 072 a48 8195 580F036 151 ...
Page 31: ...31 BASE UNIT DIMENSIONS 580F073 a48 8196 580F036 151 ...
Page 32: ...32 BASE UNIT DIMENSIONS 580F090 120 150 a48 8197 580F036 151 ...
Page 33: ...33 BASE UNIT DIMENSIONS 580F091 103 121 151 a48 8198 580F036 151 ...
Page 91: ...91 BASE UNIT DIMENSIONS 581B036 072 a48 8199 581B036 150 ...
Page 93: ...93 ACCESSORY DIMENSIONS 581B036 072 a48 8201 581B036 150 ...
Page 94: ...94 ACCESSORY DIMENSIONS 581B090 150 a48 8202 581B036 150 ...
Page 150: ...150 BASE UNIT DIMENSIONS 581C024 060 581C024 060 ...
Page 198: ...198 TYPICAL WIRING SCHEMATICS 579F 579F240 208 230 V Shown a48 7929 ...
Page 205: ...205 BASE UNIT DIMENSIONS 580F180 210 a48 8203 580F180 300 ...
Page 206: ...206 BASE UNIT DIMENSIONS 580F240 a48 8204 ...
Page 207: ...207 BASE UNIT DIMENSIONS 580F300 a48 8205 580F180 300 ...
Page 209: ...209 ACCESSORY DIMENSIONS 580F300 Vertical Roof Curbs 580F300 a48 7456 580F180 300 ...
Page 233: ...233 BASE UNIT DIMENSIONS 581A210 300 a48 8206 581A155 180 ...
Page 237: ...237 ACCESSORY DIMENSIONS 581A210 300 a48 8234 581A155 180 ...
Page 280: ...280 TYPICAL PIPING AND WIRING 581A 581A155 Shown LEGEND NEC National Electrical Code b48 1258 ...
Page 297: ...297 ...