Bryant 581A operation manual Air Quantity Limits, Evaporator Fan Motor Specifications

Table 11 — Air Quantity Limits

UNIT	MINIMUM	MAXIMUM
581A	CFM	CFM
155	3600	6,000
180	4500	7,500
240	6000	10,000

Table 12 — Evaporator Fan Motor Specifications

UNIT	NOMINAL	VOLTAGE	MAX	EFF.	MAX	MAX	MAX
581A	Hp		WATTS		BHP	BkW	AMPS
155	2.9	208	2700	85.8%	3.13	2.34	9.46
(Standard	2.9	230	2700	85.8%	3.13	2.34	8.6
Motor)	2.9	460	2700	85.8%	3.13	2.34	4.3
155	3.7	208	3775	85.8%	4.38	3.27	10.5
(Optional	3.7	230	3775	85.8%	4.38	3.27	10.5
Motor)	3.7	460	3775	85.8%	4.38	3.27	4.8
180	5	208	5180	87.5%	6.13	4.57	15.8
	5	230	5180	87.5%	6.13	4.57	15.8
	5	460	5180	87.5%	6.13	4.57	7.9
240	7.5	208	7915	88.5%	9.47	7.06	22
	7.5	230	8640	88.5%	10.33	7.71	22
	7.5	460	8640	88.5%	10.33	7.71	13

BHP — Brake Horsepower

Table 13 — Accessory/FIOP Economizer Static Pressure (in. wg)

UNIT	UNIT	CFM	ECONOMIZER
581A	VOLTAGE		PRESSURE DROP
		3,750	.03
155, 180	All	4,000	.03
		5,000	.05
		6,000	.07
		7,500	.10
		6,000	.07
240	All	7,200	.09
		9,000	.11
		10,000	.12

LEGEND

bhp — Brake Horsepower FIOP — Factory-Installed Option

NOTES:

1.The factory-assembled horizontal adapter substantially improves fan performance. See Fig. 27.

2.The static pressure must be added to external static pressure. The sum and the evaporator entering-air cfm should then be used in con- junction with the Fan Performance table to determine blower rpm, bhp, and watts.

Table 14 — Fan RPM at Motor Pulley Setting*

581A	0	1/	1	11/	2	21/	3	31/	2	4	41/	5	51/	6
		2		2		2					2		2
155†	††	††	††	††	1064	1035	1006		978	949	920	891	863	834
155**	††	††	††	††	1426	1393	1360	1327		1294	1261	1227	1194	1161
180†	††	††	††	††	1021	1002	984		965	947	928	910	891	873
180**	††	††	††	††	1200	1178	1156	1134		1112	1091	1069	1047	1025
240†	††	††	††	††	1151	1132	1114	1095		1077	1058	1040	1021	1002
240**	††	††	††	††	1369	1347	1325	1303		1281	1259	1237	1215	1193

*Approximate fan rpm shown. †Indicates standard drive package. **Indicates alternate drive package.

††Due to belt and pulley style, pulley cannot be set to this number of turns open.

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