21
START-UP
General
Complete the start-up checklist on pages CL-1 and CL-2 before
attempting system start-up.
1. Set indoor thermostat system switch to OFF position and fan
switch to AUTO position.
2. Check all electrical connections, fuses, starter and pressure
control resets.
3. Check operation of evaporator fan motor and ensure fan rota-
tion is correct. If rotation needs to be reversed, disconnect
main power and switch any 2 leads on the load side of the dis-
connect switch.
4. Adjust fan speed. Units are belt-driven and allow for a wide
range of static and airflow requirements. It may be necessary
to adjust the condenser airflow to account for these inlet con-
ditions. Inadequate airflow will result in poor unit perfor-
mance and possible nuisance tripping of high-pressure
switches. If an airflow is not specified, use the nominal air-
flow from Tables 4-15 and adjust fan speed to compensate for
actual job conditions. Use Table 1 to determine proper fan
speed. If the unit trips on high pressure due to high condens-
ing temperature it may be necessary to increase the fan speed
and condenser airflow.
5. The outdoor-air fans cycle with the compressor. Be sure fans
are running during compressor operation.
Table 4 — Condenser Fan Performance — 50XCA06 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 i
s based on unit casing, and wet DX (direct
expansion) coil losses at sea level.
CAUTION
To prevent injury, ensure that ducting or wire fan guards are
installed on the condenser fan before starting the unit.
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
2100 466 0.21 548 0.30 623 0.40 692 0.51 757 0.63 818 0.76 876 0.90 931 1.05 984 1.20 1035 1.37
2200 488 0.24 567 0.34 639 0.44 706 0.55 769 0.68 829 0.81 885 0.95 940 1.10 992 1.26 1042 1.42
2300 511 0.28 586 0.37 656 0.48 721 0.60 782 0.72 840 0.86 896 1.00 949 1.15 1000 1.31 1049 1.48
2400 533 0.31 605 0.41 673 0.53 736 0.64 796 0.77 852 0.91 907 1.06 959 1.21 1009 1.37 1057 1.54
2500 555 0.36 625 0.46 690 0.57 751 0.70 810 0.83 865 0.97 918 1.12 969 1.27 1018 1.43 1066 1.60
2600 577 0.40 644 0.51 708 0.62 767 0.75 824 0.89 878 1.03 930 1.18 980 1.34 1029 1.50 1075 1.67
2700 599 0.45 664 0.56 725 0.68 783 0.81 839 0.95 892 1.09 943 1.25 992 1.41 1039 1.57 1085 1.75
2800 621 0.50 684 0.61 744 0.74 800 0.87 854 1.01 906 1.16 956 1.32 1004 1.48 1050 1.65 1095 1.83
2900 644 0.56 704 0.67 762 0.80 817 0.94 870 1.08 920 1.23 969 1.39 1016 1.56 1062 1.73 1106 1.91
3000 666 0.61 725 0.74 781 0.87 834 1.01 886 1.15 935 1.31 983 1.47 1029 1.64 1074 1.81 1117 1.99
3100 688 0.68 745 0.80 799 0.94 852 1.08 902 1.23 950 1.39 997 1.55 1042 1.72 1086 1.90 — —
3200 710 0.75 766 0.88 818 1.01 869 1.16 918 1.31 966 1.47 1011 1.64 1056 1.81 1099 1.99 — —
3300 732 0.82 786 0.95 838 1.09 887 1.24 935 1.40 981 1.56 1026 1.73 1070 1.91 — — — —
3400 755 0.89 807 1.03 857 1.18 905 1.33 952 1.49 997 1.66 1041 1.83 — — — — — —
3500 777 0.98 828 1.12 876 1.27 924 1.42 969 1.59 1014 1.76 1057 1.93 — — — — — —
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
2100 1084 1.54 1131 1.71 1177 1.90 — — — — — — — — — — — — — —
2200 1090 1.59 1136 1.77 1182 1.96 — — — — — — — — — — — — — —
2300 1097 1.65 1142 1.83 — — — — — — — — — — — — — — — —
2400 1104 1.71 1149 1.90 — — — — — — — — — — — — — — — —
2500 1112 1.78 1156 1.97 — — — — — — — — — — — — — — — —
2600 1120 1.85 — — — — — — — — — — — — — — — — — —
2700 1130 1.93 — — — — — — — — — — — — — — — — — —
2800 — — — — — — — — — — — — — — — — — — — —
2900 — — — — — — — — — — — — — — — — — — — —
3000 — — — — — — — — — — — — — — — — — — — —
3100 — — — — — — — — — — — — — — — — — — — —
3200 — — — — — — — — — — — — — — — — — — — —
3300 — — — — — — — — — — — — — — — — — — — —
3400 — — — — — — — — — — — — — — — — — — — —
3500 — — — — — — — — — — — — — — — — — — — —
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