Carrier 50BV020-064 specifications CV Unit Start-Up, Fan Performance - 50BVC,E,Q020

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

AIRFLOW					AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
		0.2			0.4			0.6			0.8			1.0
(cfm)
	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	1.34	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					AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
		1.2			1.4			1.6			1.8			2.0
(cfm)
	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

LEGEND

Bhp — Brake Horsepower Input to Supply Fan

Watts — Input Power to Supply Fan Motor

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.

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