Bryant 581B Ð Unit Leveling Tolerances, Ii. Unit Duct Connections, Iii. Rig And Place Unit

MAXIMUM ALLOWABLE

DIFFERENCE (in.)

A-B	B-C	A-C
0.5	1.0	1.0

Fig. 5 Ð Unit Leveling Tolerances

II. UNIT DUCT CONNECTIONS

On vertical units, secure all ducts to roof curb and building structure. Do not connect ductwork to unit. On horizontal units, duct ¯anges should be attached to horizontal openings and all ductwork should be secured to ¯anges. 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 in- sulated and covered with a vapor barrier.

If a plenum return is used on a vertical unit, the return should be ducted through the roof deck to comply with applicable ®re codes.

A minimum clearance is not required around ductwork. Cabinet return-air static shall not exceed −0.35 in. wg with Varislide™ economizer, −0.35 in. wg with PARABLADE econo- mizer, or −0.45 in. wg without economizer.

NOTE: Connection must be made to roof curb before unit is set in place.

III. RIG AND PLACE UNIT

Inspect unit for transportation damage. File any claim with transportation agency. Keep unit upright and do not drop. Spreader bars are not required if top crating is left on unit. Rollers may be used to move unit across a roof. Level by us- ing unit frame as a reference. See Table 1 and Fig. 6 for ad- ditional information. Operating weight is shown in Table 1 and Fig. 6.

Lifting holes are provided in base rails as shown in Fig. 6. Refer to rigging instructions on unit.

IMPORTANT: If unit has forklift protection skids, be sure to remove forklift protection skids from under unit before set- ting unit in place.

CAUTION: All panels must be in place when rigging.

A properly positioned unit will have the following clearances between unit and roof curb: 1¤4-in. clearance between roof curb and base rails on each side and front of unit; 15¤32-in. clear- ance between roof curb and rear of unit. See Fig. 4, Views A-A and C-C.

After unit is in position, remove shipping materials and rig- ging skids.

NOTES:

1. Dimension in ( ) are in millimeters.

2.Hook rigging shackles through holes in base rail as shown in detail ``A.'' Holes in base rails are centered around the unit center of grav- ity. Use wooden top skid when rigging to prevent rigging straps from damaging unit.

3.Weights include base unit without economizer. See Table 1 for unit operating weights with an economizer.

CAUTION: All panels must be in place when rigging.

UNIT	MAX				DIMENSIONS
	WEIGHT		``A''		``B''		``C''
581B
	Lb	Kg	in.	mm	in.	mm	in.	mm
036	530	240	73.69	1872	35.50	902	33.31	847
048	540	245	73.69	1872	35.50	902	33.31	847
060	560	254	73.69	1872	35.50	902	33.31	847
072	615	279	73.69	1872	35.50	902	33.31	847

Fig. 6 Ð Rigging Details

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