Bryant 580G manual III. Field Fabricate Ductwork, IV. Unit Duct Connections

Table 2 Ð Evaporator Fan Motor Data

		MOTOR	FAN		MOTOR			FAN				BELT
UNIT					SHEAVE	BUSHING		SHEAVE	BUSHING		OUTSIDE
	MOTOR	SHAFT	SHAFT	MOTOR			FAN			BELT		TENSION
SIZE					PITCH	DIAMETER		PITCH	DIAMETER		BELT
	HP	DIA.	SPEED	SHEAVE			SHEAVE			(QUANTITY)		(lb at
580G,H					DIAMETER	(in.)		DIAMETER	(in.)		LENGTH
		(in.)	(rpm)									.24 in.)
					(in.)			(in.)
240	5	1.12	717	BK55	4.8	None-1.125	1B5V124	12.4	B-1.9375	BX59	62	5.10
	10	1.38	924	2BK50	4.4	None-1.375	2B5V86	8.6	B-1.9375	(2) BX51	54	5.21
	15	1.62	1096	2B5V56	5.7	B-1.625	2B5V90	9.1	B-1.9375	(2) 5VX530	53	6.00
300	7.5	1.38	773	BK60H	5.4	H-1.375	1B5V124	12.4	B-1.9375	BX59	62	6.48
	10	1.38	962	1B5V60	6.1	H-1.375	1B5V110	11.1	B-1.9375	5VX590	59	7.37
	15	1.62	1106	2B5V54	5.5	B-1.625	2B5V86	8.7	B-1.9375	(2) 5VX530	53	6.12
324	10	1.38	848	2BK50	4.4	None-1.375	2B5V94	9.4	B-1.9375	(2) BX52	55	5.27
	15	1.62	1059	2B5V48	4.9	B-1.625	2B5V80	8.1	B-1.9375	(2) 5VX500	50	6.63
	20	1.62	1187	2B5V58	5.9	B-1.625	2B5V86	8.7	B-1.9375	(2) 5VX530	53	7.31
360	10	1.38	884	2BK50	4.4	H-1.375	2B5V90	9.0	B-1.9375	(2) BX51	54	5.24
	15	1.62	1096	2B5V56	5.7	B-1.625	2B5V90	9.1	B-1.9375	(2) 5VX530	53	6.00
	20	1.62	1187	2B5V58	5.9	B-1.625	2B5V86	8.7	B-1.9375	(2) 5VX530	53	7.31

NOTE: Motor shaft speed is 1750 rpm. The fan shaft diameter is 111¤16 inches.

A. Positioning

Provide clearance around and above unit for air¯ow, safety, and service access (Fig. 2 and 3).

Do not install unit in an indoor location. Do not locate air inlets near exhaust vents or other sources of contaminated air.

For proper unit operation, adequate combustion and ventila- tion air must be provided in accordance with Section 5.3 (Air for Combustion and Ventilation) of the National Fuel Gas Code, ANSI Z223.1 (American National Standards Institute).

Although unit is weatherproof, guard against water from higher level runoff and overhangs.

B. Roof Mount

Check building codes for weight distribution requirements.

III. FIELD FABRICATE DUCTWORK

Secure all ducts to building structure. Use ¯exible duct con- nectors between unit and ducts as required. Insulate and weath- erproof all external ductwork, joints, and roof openings with counter ¯ashing and mastic in accordance with applicable codes.

Ducts passing through an unconditioned space must be insulated and covered with a vapor barrier.

To attach ductwork to roof curb, insert ductwork approx- imately 10 to 11 in. up into the curb. Connect ductwork to 14-gage roof curb material using sheet metal screws driven from inside the duct.

WARNING: For vertical supply and return units, tools or parts could drop into ductwork and cause an injury. Install 90 degree elbow turns in the supply and return ductwork between the unit and the conditioned space. If a 90 degree elbow cannot be installed, then grilles of sufficient strength and density should be installed to prevent objects from falling into the conditioned space.

IV. UNIT DUCT CONNECTIONS

A. 580G Units

Unit is shipped for through-the-bottom duct connections. Duct- work openings are shown in Fig. 2. Attach all ductwork to roof curb. Air distribution is shown in Fig. 5. Refer to installation instructions shipped with accessory roof curb for more information.

B. 580H Units

Remove shipping covers from supply and return air open- ings. Attach ®eld-supplied ductwork to unit. Use a single duct over both return openings and a single duct over both sup- ply openings. See Fig. 3 for duct opening dimensions. Secure all ducts to the building structure. See Fig. 6. Use ¯exible duct connectors between unit and ducts as required.

Install accessory barometric relief or power exhaust in the ®eld-fabricated return ductwork. Refer to Power Exhaust/Barometric Relief Damper Hood section for more information.

Fig. 5 Ð Air Distribution Ð Thru-the-Bottom

Fig. 6 Ð Air Distribution Ð Thru-the-Side

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