Bryant 581A Horizontal Adapter Roof Curbs, and Roof Curbs, B. Alternate Unit Support

NOTE: For preassembled horizontal adapter roof curb part no. (CRRFCURB013A00), the accessory kit includes a factory-designed, high-static, regain transition duct. For horizontal curb part no. CRRFCURB012A00, a field-supplied transition duct is required.

Fig. 2 — Horizontal Adapter Roof Curbs

and Roof Curbs

IMPORTANT: Curb or adapter roof curb must be level. This is necessary to permit unit drain to function properly. Unit lev- eling tolerance is ±1/16 in. per linear ft in any direction. Refer to Accessory Roof Curb or Horizontal Supply Roof Curb Installation Instructions for additional information as required.

When accessory roof curb or horizontal supply roof curb is used, unit may be installed on class A, B, or C roof covering material.

IMPORTANT: The gasketing of the unit to the roof curb or adapter roof curb is critical for a watertight seal. Install gas- ket with the roof curb or adapter as shown in Fig. 1. Improp- erly applied gasket can also result in air leaks and poor unit performance.

B. Alternate Unit Support

When a curb or adapter cannot be used, install unit on a noncombustible surface. Support unit with sleepers, using unit curb support area. If sleepers cannot be used, support long sides of unit with a minimum of 3 equally spaced 4-in. x 4-in. pads on each side.

II. STEP 2 — RIG AND PLACE UNIT

Inspect unit for transportation damage. File any claim with transportation agency.

Do not drop unit; keep upright. Spreader bars are not required if top crating is left on unit. Use spreader bars over unit to prevent sling or cable damage. Rollers may be used to move unit across a roof. Level by using unit frame as a refer- ence; leveling tolerance is ± 1/16 in. per linear ft in any direc- tion. See Fig. 3 for additional information. Unit operating weight is shown in Table 1.

Four lifting holes are provided in ends of unit base rails as shown in Fig. 3. Refer to rigging instructions on unit.

A. Positioning

Maintain clearance, per Fig. 4 and 5, around and above unit to provide minimum distance from combustible materials, proper airflow, and service access.

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 ven- tilation 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.

Locate mechanical draft system flue assembly at least 4 ft from any opening through which combustion products could enter the building, and at least 4 ft from any adjacent build- ing. When unit is located adjacent to public walkways, flue assembly must be at least 7 ft above grade.

B. Roof Mount

Check building codes for weight distribution requirements. Unit operating weight is shown in Table 1.

Instructions continued on page 8.

NOTES:

1. Dimensions in ( ) are in millimeters.

2.Refer to Fig. 4 and 5 for unit operating weights.

3.Remove boards at ends of unit and runners prior to rigging.

4.Rig by inserting hooks into unit base rails as shown. Use corner post from packaging to protect coil from damage. Use bumper boards for spreader bars on all units.

5.Weights do not include optional economizer. Add 110 lb (50 kg) for econo- mizer weight.

6.Weights given are for aluminum evaporator and condenser coil plate fins.

7.Add 75 lb (34 kg) for crating on 581A155 and 180 units. Add 135 lb (61 kg) for crating on 581A240 units.

8.Add 150 lb (68 kg) for copper condenser coil. Add 280 lb (127 kg) for copper condenser and evaporator coils.

CAUTION: All panels must be in place when rigging.

	MAXIMUM SHIPPING					DIMENSIONS
UNIT
	WEIGHT				A			B
581A
	lb	kg	ft-in.			mm	ft-in.		mm
155	1725	782	6-111/	2		2121	4-0		1219
180	1800	816	6-111/	2		2121	3-2		964
240	1900	862	6-111/	2		2121	3-4		1016

Fig. 3 — Rigging Details

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