Carrier 48PG20-28 specifications Fan Rpm at Motor Pulley Settings

Table 26 — Accessory/FIOP Static Pressure (in. wg)* — 48PG20-28

COMPONENT					CFM
	4,000	4,500	5,000	5,500	6,000	6,500	7,000	7,500	8,000
Economizer	0.02	0.03	0.04	0.05	0.06	0.07	0.08	0.09	0.10
COMPONENT				CFM
	8,500	9,000	9,500	10,000	10,500	11,000	11,500	12,000
Economizer	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 deter- mine blower rpm and watts.

Table 27 — Fan Rpm at Motor Pulley Settings*

UNIT	DRIVE					MOTOR PULLEY TURNS OPEN
48PG		0	1/2	1	11/2	2		21/2	3	31/2	4	41/2	5	51/2	6
	Low	685	706	727	749	770		791	812	833	854	876	897	918	939
	Mid-Low	949	970	992	1013	1035		1056	1078	1099	1120	1142	1163	1185	1206
	Mid-High	941	961	980	1000	1019		1039	1059	1078	1098	1117	1137	1156	1176
20 and 24	High	1014	1038	1061	1085	1108		1132	1156	1179	1203	1226	1250	1273	1297
(230 and 460 volt)	Low	n/a	n/a	n/a	n/a	n/a		n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a
	Mid-Low	896	924	951	979	1006		1034	1062	1089	1117	1144	1172	1199	1227
	Mid-High	1113	1138	1163	1188	1213		1238	1264	1289	1314	1339	1364	1389	1414
	High	1096	1116	1137	1157	1177		1197	1218	1238	1258	1278	1299	1319	1339
	Low	751	768	785	802	819		836	853	869	886	903	920	937	954
	Mid-Low	949	970	992	1013	1035		1056	1078	1099	1120	1142	1163	1185	1206
	Mid-High	941	961	980	1000	1019		1039	1059	1078	1098	1117	1137	1156	1176
20 and 24	High	1014	1038	1061	1085	1108		1132	1156	1179	1203	1226	1250	1273	1297
(575 volt)	Low	n/a	n/a	n/a	n/a	n/a		n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a
	Mid-Low	873	893	912	932	951		971	991	1010	1030	1049	1069	1088	1108
	Mid-High	1113	1138	1163	1188	1213		1238	1264	1289	1314	1339	1364	1389	1414
	High	1096	1116	1137	1157	1177		1197	1218	1238	1258	1278	1299	1319	1339
	Low	687	703	718	734	749		765	780	796	811	827	842	858	873
	Mid-Low	805	822	839	856	872		889	906	923	940	957	973	990	1007
	Mid-High	941	961	980	1000	1019		1039	1059	1078	1098	1117	1137	1156	1176
28	High	1014	1038	1061	1085	1108		1132	1156	1179	1203	1226	1250	1273	1297
(all voltages)	Low	687	703	718	734	749		765	780	796	811	827	842	858	873
	Mid-Low	805	822	839	856	872		889	906	923	940	957	973	990	1007
	Mid-High	941	961	980	1000	1019		1039	1059	1078	1098	1117	1137	1156	1176
	High	1014	1038	1061	1085	1108		1132	1156	1179	1203	1226	1250	1273	1297
LEGEND							*Approximate fan rpm shown.
n/a — not available							NOTE: Factory pulley speed setting is at 3 turns open.

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 wiring of accessory sensors is required for different operational modes.

ECONOMI$ER IV STANDARD SENSORS

Outdoor Air Temperature (OAT) Sensor — The outdoor air temperature sensor 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 airstream. See Fig. 24. The operating range of temperature measurement is 40 to 100 F.

Mixed-Air Temperature (MAT) Sensor — The mixed-air temperature sensor is a 3 K thermistor located at the outlet of the indoor fan. See Fig. 24. This sensor 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 temperature lockout switch located in the outdoor airstream which is used to lock out the compres- sors below a 42 F ambient temperature.

ECONOMI$ER IV CONTROLLER WIRING AND OPER- ATIONAL MODES — Determine the EconoMi$er IV control mode before set up of the control. Some modes of operation may require different sensors. Refer to Table 28. The EconoMi$er IV is supplied from the factory with a mixed-air temperature sensor and an outdoor air temperature sensor. This allows for operation of the EconoMi$er IV with outdoor air dry bulb changeover control. Additional accessories can be added to allow for different 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 configured for outdoor dry bulb changeover control. The outdoor air and mixed-air temperature sensors are included as standard. For this control mode, the out- door 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 minimum position. If the outdoor-air temperature is below the set point, the position of the outdoor-air dampers will be con- trolled to provided free cooling using outdoor air. When in this mode, the LED next to the free cooling set point potentiometer will be on. The changeover temperature set point is controlled by the free cooling set point potentiometer located on the con- trol. The scale on the potentiometer is A, B, C, and D. See Fig. 25 for the corresponding temperature changeover values.

39