Parts Manual

TECHNICAL SUPPORT MANUAL Horizontal Coils: ENH4X
484 04 3700 00 5
NOTES:
1. Contact manufacturer for cooling capacities at conditions other than shown in table.
2. Formulas:
Leaving db = entering db −
sensible heat cap.
1.09 x CFM
Leaving wb = wb corresponding to enthalpy of air leaving coil (h
LWB
)
h
LWB
= h
EWB
−
total capacity (Btuh)
4.5 x CFM
Where h
EWB
= enthalpy of air entering coil
3. SHC is based on 80°F (27°C) db temperature of air entering the evaporator coil.
Below 80°F (27°C) db, subtract (Correction Factor x CFM) from SHC.
Above 80°F (27°C) db, add (Correction Factor x CFM) to SHC.
4. Direct interpolation is permissible. Do not extrapolate.
5. Fan motor heat has not been deducted.
6. All data points are based on 10°F (−12°C) superheat leaving coil and use of thermostatic expansion valve (TXV) device.
7. The ENH4X coils can be used in any properly designed system using R−410A refrigerant.
8. Before using maximum cfm shown in table, check coil static pressure drop to ensure system blower can provide necessary
static pressure needed for coil and duct systems.
9. Bypass Factor = 0 indicates no psychometric solution. Use bypass factor of next lower EWB for approximation.
BYPASS FACTOR
ENTERING AIR DRY BULB TEMPERATURE _F (_C)
79 (26) 78 (26) 77 (25) 76 (24) 75 (24) Under 75 (24)
81 (27) 82 (28) 83 (28) 84 (29) 84 (29) Above 85 (29)
Correction Factor
0.10 0.98 1.96 2.94 3.92 4.91
Use formula shown below
0.20 0.87 1.74 2.62 3.49 4.36
0.30 0.76 1.53 2.29 3.05 3.82
Interpolation is permissible.
Correction Factor = 1.09 x (1 − BF) x (db − 80)
COIL STATIC PRESSURE DROP (in. w.c.)
UNIT
SIZE
Standard CFM
400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200
24
Dry
0.048 0.068 0.090 0.112 0.140 0.170 0.203
Wet
0.064 0.091 0.122 0.150 0.188 0.224 0.263
30
Dry
0.042 0.060 0.080 0.102 0.128 0.157 0.188 0.222 0.259
Wet
0.055 0.076 0.104 0.127 0.158 0.190 0.225 0.266 0.309
31
Dry
0.031 0.046 0.063 0.083 0.105 0.130 0.156 0.193 0.230
Wet
0.039 0.056 0.075 0.097 0.121 0.149 0.179 0.212 0.249
36
Dry
0.043 0.061 0.082 0.103 0.128 0.157 0.189 0.221 0.259 0.299 0.341
Wet
0.056 0.079 0.107 0.133 0.166 0.200 0.236 0.276 0.315 0.361 0.413
42
Dry
0.030 0.041 0.054 0.066 0.082 0.099 0.118 0.137 0.158 0.180 0.205 0.231 0.259
Wet
0.043 0.059 0.078 0.101 0.126 0.153 0.181 0.207 0.234 0.260 0.288 0.319 0.354
43
Dry
0.040 0.052 0.066 0.081 0.098 0.177 0.137 0.156 0.183 0.205 0.233
Wet
0.049 0.062 0.079 0.096 0.114 0.138 0.162 0.189 0.216 0.239 0.27
48
Dry
0.047 0.060 0.075 0.092 0.110 0.130 0.152 0.176 0.204 0.230 0.256 0.284 0.318
Wet
0.053 0.067 0.085 0.104 0.125 0.147 0.172 0.200 0.228 0.259 0.292 0.327 0.365
60
Dry
0.062 0.073 0.084 0.097 0.111 0.126 0.138 0.154 0.172 0.190 0.210 0.228 0.251 0.273 0.293
Wet
0.082 0.096 0.112 0.129 0.145 0.163 0.171 0.191 0.212 0.235 0.258 0.283 0.310 0.336 0.366
61
Dry
0.196 0.216 0.238 0.259 0.286 0.312 0.336 0.363 0.390
Wet
0.208 0.233 0.259 0.281 0.307 0.339 0.368 0.400 0.431