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when it starts. Also, no cooling will be produced at the
evaporator. If any of these conditions occurs, refer to the
Service section to correct the compressor rotation before
continuing.
INTERNAL WIRING — Check all electrical connections in
unit control boxes; tighten as required.
RETURN-AIR FILTERS — Check that correct filters are
installed in filter tracks (see Tables 3A and 3B). Do not operate
unit without return-air filters.
COMPRESSOR MOUNTING — Compressors are internal-
ly spring mounted. Do not loosen or remove compressor hold-
down bolts.
REFRIGERANT SERVICE PORTS — Each refrigerant system
has a total of 2 Schrader-type service gage ports per circuit. One
port is located on the suction line, and one on the compressor
discharge line. Be sure that caps on the ports are tight.
CV Unit Start-Up
EVAPORATOR FAN — Fan belt and variable pitch motor
pulleys are factory installed. See Tables 13-20 for fan perfor-
mance data. Be sure that fans rotate in the proper direction.
COOLING — Set the space thermostat to OFF position. Turn
on unit power. Set space thermostat to COOL and the fan to
AUTO. Adjust the thermostat temperature setting below room
temperature. Compressor 1 starts on closure of contactor (com-
pressors 1 and 2 on 4-circuit units with 2-stage thermostat).
Adjust the thermostat to an even lower setting until the ther-
mostat energizes Y2 (the second cooling stage). Compressor 2
starts on closure of contactor (compressors 3 and 4 on 4-circuit
units with 2-stage thermostat).
Adjust the thermostat temperature to a setting just below
room temperature. The second stage of cooling should turn off.
Set the thermostat temperature above room temperature. All
compressors and the unit fan should now be off.
HEATING (Heat Pump Units Only) — Follow the same se-
quence as for cooling (above), except set the space thermostat
to HEAT, and instead of adjusting the thermostat below room
temperature, adjust it above. Verify that the compressors turn
on and the unit runs in reverse cycle mode.
Set the thermostat below room temperature and confirm
that the compressors and fan turn off.
Table 13 — Fan Performance — 50BVC,E,Q020
LEGEND
NOTES:
1. Units are available with the following motor and drive combina-
tions: 1.5, 2, 3, 5 HP standard drive; 1.5, 2, 3 HP medium static
drive.
For 1.5, 2, 3 HP standard drives, the drive range is 753 to
952 rpm. For medium static drives, the drive range is 872 to
1071 rpm. For 5 HP standard drives, the drive range is 967 to
1290 rpm.
2. Italics indicates field-supplied drive required.
3. Do not operate in shaded area.
4. Static pressure losses must be applied to external static pres-
sure before entering the fan performance table.
5. Interpolation is permitted, extrapolation is not.
6. Fan performance is based on filter, unit casing and wet coil
losses.
7. Bhp values are per fan. Watts values are per motor. Unit has
2 supply fans and 2 motors.
AIRFLOW
(cfm)
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
0.2 0.4 0.6 0.8 1.0
Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp
4500
— — — — — — 623 459 0.52 — — — — — —
5000
— — — — — — 638 545 0.61 — — — — — —
5500
— — — — — — 655 641 0.72 725 755 0.85 — — —
6000
— — — 608 641 0.72 676 755 0.85 742 878 0.99 807 1001 1.13
6500
— — — 636 755 0.85 699 878 0.99 761 1010 1.14 821 1142 1.29
7000 604 774 0.87 666 906 1.02 726 1029 1.16 784 1170 1.32 841 1311 1.48
7500 634 916 1.03 693 1057 1.19 750 1189 1.3 4 805 1330 1.50 858 1480 1.67
8000 667 1085 1.22 723 1226 1.38 777 1377 1.55 829 1526 1.72 880 1676 1.89
8500 700 1273 1.43 753 1423 1.60 804 1573 1.77 853 1732 1.95 902 1836 2.13
9000 735 1480 1.67 785 1638 1.84 833 1745 2.02 881 1908 2.21 927 2071 2.40
AIRFLOW
(cfm)
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
1.2 1.4 1.6 1.8 2.0
Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp
4500
— — — — — — — — — — — — — — —
5000
— — — — — — — — — — — — — — —
5500
— — — — — — — — — — — — — — —
6000
— — — — — — — — — — — — — — —
6500 881 1283 1.44
— — — — — — — — — — — —
7000 897 1451 1.63 951 1601 1.80
— — — — — — — — —
7500 911 1629 1.83 963 1727 2.00 1014 1881 2.18
— — — — — —
8000 930 1781 2.07 979 1935 2.24 1028 2098 2.43 1076 2260 2.62 1124 2422 2.81
8500 950 1989 2.31 997 2152 2.50 1043 2323 2.69 1089 2485 2.88 1134 2697 3.09
9000 973 2233 2.59 1018 2404 2.79 1062 2576 2.99 1106 2779 3.18 1149 2960 3.39
Bhp — Brake Horsepower Input to Supply Fan
Watts — Input Power to Supply Fan Motor