32
Table 15 — Evaporator Fan Performance — 50XCA24 Units
LEGEND
Bhp — Brake Horsepower
ESP — External Static Pressure
NOTES:
1. Units are available with several motor hp options. Refer to Table 1.
2. Static pressure losses for any options or accessories must be
applied to external static pressure before entering the fan perfor-
mance table.
3. Interpolation is permitted; extrapolation is not.
4. Fan performance is based on 1 in. standard throwaway filter, unit
casing,
and wet DX (direct expansion) coil losses at sea level.
Compressor Rotation
To determine whether or not compressor is rotating in the proper
direction:
1. Connect service gages to suction and discharge pressure
fittings.
2. Energize the compressor.
3. The suction pressure should drop and the discharge pressure
should rise, as is normal on any start-up.
4. If the suction pressure does not drop and the discharge pres-
sure does not rise to normal levels, the compressor may be
rotating in the wrong direction.
5. Since the compressor and fan motors are connected in phase
during production, it is likely that the evaporator and con-
denser fans are probably also rotating in the wrong direction.
6. Turn off power to the unit and lock and tag disconnect per
standard safety procedures.
7. Reverse any two of the unit power leads.
8. Remove lock and tag per standard safety procedures and
reapply power to the unit.
9. The suction and discharge pressure levels should now move
to their normal start-up levels.
NOTE: When the compressor is rotating in the wrong direction,
the unit makes an elevated level of noise and does not provide
cooling.
Operating Sequence
All units require the addition of a thermostat accessory package to
complete the control circuit. The sequence of operation may vary
depending on which package is selected.
ROOM-MOUNTED THERMOSTAT
These units use an electronic thermostat mounted in the condi-
tioned space.
CFM
ESP (in. wg)
0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp
6,000 558 1.77 619 1.99 675 2.19 728 2.39 777 2.58 824 2.76 869 2.94 912 3.11 952 3.28 992 3.44
6,300 585 1.95 644 2.17 698 2.38 749 2.58 797 2.77 843 2.95 887 3.13 928 3.31 968 3.48 1007 3.64
6,600 613 2.14 669 2.36 722 2.57 771 2.77 818 2.96 862 3.15 905 3.33 945 3.51 985 3.68 1023 3.85
6,900 641 2.34 695 2.56 746 2.77 793 2.97 839 3.17 882 3.36 923 3.54 963 3.72 1002 3.90 1039 4.07
7,200 669 2.55 721 2.77 770 2.98 816 3.18 860 3.38 902 3.57 943 3.76 982 3.94 1019 4.12 1056 4.29
7,500 697 2.77 747 2.99 794 3.20 839 3.40 882 3.60 923 3.79 962 3.98 1000 4.17 1037 4.35 1073 4.52
7,800 725 2.99 773 3.21 818 3.43 862 3.63 904 3.83 944 4.03 982 4.22 1020 4.40 1056 4.58 1091 4.76
8,000 743 3.15 790 3.37 835 3.58 878 3.79 918 3.99 958 4.18 996 4.38 1033 4.56 1068 4.75 1103 4.93
8,300 771 3.39 817 3.61 860 3.82 901 4.03 941 4.23 979 4.43 1017 4.62 1053 4.81 1087 5.00 1121 5.18
8,600 799 3.64 843 3.86 885 4.07 925 4.28 964 4.48 1001 4.68 1038 4.88 1073 5.07 1107 5.26 1140 5.44
8,900 827 3.90 869 4.12 910 4.33 949 4.54 987 4.75 1024 4.95 1059 5.14 1093 5.33 1127 5.52 1160 5.71
9,200 855 4.16
896 4.38 935 4.60 973 4.81 1010 5.02 1046 5.22 1081 5.41 1114 5.61 1147 5.80 1179 5.99
9,500 883 4.44 923 4.66 961 4.88 998 5.09 1034 5.29 1069 5.50 1103 5.69 1136 5.89 1168 6.08 1199 6.27
9,800 911 4.72 949 4.95 987 5.16 1023 5.37 1058 5.58 1092 5.78 1125 5.98 1157 6.18 1189 6.37 1220 6.57
10,000 929 4.92 967 5.14 1004 5.36 1039 5.57 1074 5.78 1107 5.98 1140 6.18 1172 6.38 1203 6.57 1233 6.77
CFM
ESP (in. wg)
1.00 1.10 1.20 1.30 1.40 1.50 1.60 1.70 1.80 1.90
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp
6,000 1030 4.12 1067 4.46 1102 4.80 1137 5.14 1171 5.49 1203 5.84 1235 6.20 1267 6.56 1297 6.92 1327 7.29
6,300 1044 4.42 1080 4.76 1116 5.12 1150 5.47 1183 5.83 1215 6.20 1247 6.56 1278 6.94 1308 7.31 — —
6,600 1059 4.73 1095 5.09 1129 5.45 1163 5.82 1196 6.19 1228 6.57 1259 6.95 1289 7.33 — — — —
6,900 1075 5.06 1110 5.43 1144 5.81 1177 6.18 1209 6.57 1241 6.96 1272 7.35 — — — — — —
7,200 1091 5.41 1125 5.79 1159 6.18 1191 6.57 1223 6.97 1254 7.36 — — — — — — — —
7,500 1108 5.78 1141 6.18 1174 6.57 1206 6.98 1238 7.38 — — — — — — — — — —
7,800 1125 6.17 1158 6.58 1190 6.99 1222 7.40 — — — — — — — — — — — —
8,000 1137 6.45 1169 6.86 1201 7.28 — — — — — — — — — — — — — —
8,300 1154 6.88 1187 7.30 — — — — — — — — — — — — — — — —
8,600 1173 7.33 — — — — — — — — — — — — — — — — — —
8,900 — — — — — — — — — — — — — — — — — — — —
9,200 — — — — — — — — — — — — — — — — — — — —
9,500 — — — — — — — — — — — — — — — — — — — —
9,800 — — — — — — — — — — — — —
— — — — — — —
10,000 — — — — — — — — — — — — — — — — — — — —
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