Bryant 581A Accessory/FIOP Static Pressure in. wg, Fan Rpm at Motor Pulley Settings

Table 26 — Accessory/FIOP Static Pressure (in. wg)*

COMPONENT									CFM
	4,000	4,500	5,000	5,500	6,000	6,500	7,000	7,500	8,000	8,500	9,000	9,500	10,000	10,500	11,000	11,500	12,000
EconoMi$er IV	0.02	0.03	0.04	0.05	0.06	0.07	0.08	0.09	0.10	0.11	0.12	0.13	0.15	0.16	0.17	0.19	0.20

LEGEND

FIOP — Factory-Installed Option

*The static pressure must be added to the external static pressure. The sum and the evaporator entering-air cfm should then be used in conjunction with the Fan Performance tables to determine blower rpm and watts.

Table 27 — Fan Rpm at Motor Pulley Settings*

581A						MOTOR PULLEY TURNS OPEN
UNIT	DRIVE
		0	1/2	1	11/2	2	21/2	3	31/2	4	41/2	5	51/2	6
SIZE
210	Low Range Vertical	647	667	687	707	727	747	767	786	806	826	846	866	886
	High Range Vertical	897	917	937	958	978	998	1018	1038	1058	1079	1099	1119	1139
(208/230 and
	Low Range Horizontal	896	924	951	979	1006	1034	1062	1089	1117	1144	1172	1199	1227
460 volt)
	High Range Horizontal	1113	1138	1163	1188	1213	1238	1264	1289	1314	1339	1364	1389	1414
	Low Range Vertical	810	832	854	876	897	919	941	963	985	1007	1028	1050	1072
210	High Range Vertical	873	893	912	932	951	971	991	1010	1030	1049	1069	1088	1108
(575 volt)	Low Range Horizontal	863	886	909	933	956	979	1002	1025	1048	1072	1095	1118	1141
	High Range Horizontal	1042	1062	1083	1103	1123	1143	1164	1184	1204	1224	1245	1265	1285
240	Low Range Vertical	949	970	992	1013	1035	1056	1078	1099	1120	1142	1163	1185	1206
	High Range Vertical	941	961	980	1000	1019	1039	1059	1078	1098	1117	1137	1156	1176
(208/230 and
	Low Range Horizontal	1113	1138	1163	1188	1213	1238	1264	1289	1314	1339	1364	1389	1414
460 volt)
	High Range Horizontal	1096	1116	1137	1157	1177	1197	1218	1238	1258	1278	1299	1319	1339
	Low Range Vertical	949	970	992	1013	1035	1056	1078	1099	1120	1142	1163	1185	1206
240	High Range Vertical	941	961	980	1000	1019	1039	1059	1078	1098	1117	1137	1156	1176
(575 volt)	Low Range Horizontal	1113	1138	1163	1188	1213	1238	1264	1289	1314	1339	1364	1389	1414
	High Range Horizontal	1096	1116	1137	1157	1177	1197	1218	1238	1258	1278	1299	1319	1339
	Low Range Vertical	941	961	980	1000	1019	1039	1059	1078	1098	1117	1137	1156	1176
300	High Range Vertical	1014	1038	1061	1085	1108	1132	1156	1179	1203	1226	1250	1273	1297
(all voltages)	Low Range Horizontal	941	961	980	1000	1019	1039	1059	1078	1098	1117	1137	1156	1176
	High Range Horizontal	1014	1038	1061	1085	1108	1132	1156	1179	1203	1226	1250	1273	1297

*Approximate fan rpm shown.

XII. OPTIONAL ECONOMI$ER IV

See Fig. 23 for EconoMi$er IV component locations. The optional EconoMi$er IV comes from the factory fully wired and assembled. No field wiring or assembly is required for standard outdoor dry bulb changeover operation. Field wir- ing of accessory sensors is required for different operational modes.

A. EconoMi$er IV Standard Sensors

Outdoor Air Temperature (OAT) Sensor

The outdoor air temperature sensor (HH57AC074) is a 10 to 20 mA device used to measure the outdoor-air temperature. The outdoor-air temperature is used to determine when the EconoMi$er IV can be used for free cooling. The sensor is factory-installed on the EconoMi$er IV in the outdoor air- stream. See Fig. 23. The operating range of temperature measurement is 40 to 100 F.

Supply-Air Temperature (SAT) Sensor

The supply-air temperature sensor is a 3 K thermistor located at the outlet of the indoor fan. See Fig. 24. This sen- sor is factory installed. The operating range of temperature measurement is 0° to 158 F.

The temperature sensor is a short probe with blue wires running to it.

Outdoor Air Lockout Sensor

The EconoMi$er IV is equipped with an ambient tempera- ture lockout switch located in the outdoor airstream which is used to lock out the compressors below a 42 F ambient temperature.

B. EconoMi$er IV Controller Wiring and Operational Modes

Determine the EconoMi$er IV control mode before set up of the control. Some modes of operation may require different sensors. Refer to Table 28. The EconoMi$er IV is supplied from the factory with a supply-air temperature sensor and an outdoor air temperature sensor. This allows for operation of the EconoMi$er IV with outdoor air dry bulb changeover control. Additional accessories can be added to allow for dif- ferent types of changeover control and operation of the EconoMi$er IV and unit.

Outdoor Dry Bulb Changeover

The standard controller is shipped from the factory config- ured for outdoor dry bulb changeover control. The outdoor air and supply-air temperature sensors are included as standard. For this control mode, the outdoor temperature is compared to an adjustable set point selected on the control. If the outdoor-air temperature is above the set point, the EconoMi$er IV will adjust the outdoor-air dampers to mini- mum position. If the outdoor-air temperature is below the set point, the position of the outdoor-air dampers will be con- trolled to provide free cooling using outdoor air. When in this mode, the LED next to the free cooling set point potentiome- ter will be on. The changeover temperature set point is con- trolled by the free cooling set point potentiometer located on the control. The scale on the potentiometer is A, B, C, and D. See Fig. 25 for the corresponding temperature changeover values.

—30—