Bryant 764A Locate the Unit, Clearance, Ground-Level Installation, II. RIG and Place Unit, Ð5Ð

I. LOCATE THE UNIT

A. Clearance

Provide sufficient space for condenser air¯ow clearance, wir- ing, and servicing unit. See Fig. 2-4. Locate unit where supply- and return-air ducts can be conveniently brought out to unit duct connections.

Unit may be placed with duct side as close to building as top removal, duct connections, and power connec- tions permit. Position unit so water or ice from roof does not drop directly on top of unit or in front of coil. Make pro- visions for condensate drainage. Maintain a 4 ft clearance above unit for vertical air discharge.

Roof installation method for units depends on building con- struction and special requirements of local building codes.

Be sure that roof can support unit weight.

Maintain clearance around and above unit to provide proper air¯ow and service access. See Fig. 2-4.

CAUTION: Do not restrict condenser air¯ow. An air restriction at either the condenser air inlet (the entire surface of the condenser coil) or the fan discharge can be detrimental to compressor life.

The condenser fan discharges through the top of the unit. Ensure that the fan discharge does not recirculate to the con- denser coil. Do not locate the unit either in a corner or under a complete overhead obstruction, and ensure the following clear- ances are provided:

On roof overhangs, provide a minimum clearance of 48 in. above the top of the unit for partial overhangs (such as a normal house roof overhang). If there is a horizontal exten- sion on the partial overhang, extension must not exceed 48 inches. For extended overhangs, provide a minimum clear- ance of 36 in. between unit and overhang.

Provide a minimum clearance of 42 in. for the control box side next to a block wall or any other grounded surface. Pro- vide a minimum clearance of 36 in. between the control box side of the unit and any electrically live parts.

Unit may be installed on wood ¯ooring, or on Class A, B, or C roof covering materials.

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

Units should be at least 4 in. above the highest expected wa- ter, ¯ood, and runoff levels. Do not use the unit if it has been under water.

B. Ground-Level Installation

Mount unit on a solid, level pad. See Fig. 5 for unit leveling tolerances. Construct pad as shown in Fig. 6. Side of unit with condensate trap should be ¯ush with pad for proper trap po- sitioning (see Fig. 2-4). Extend a 24-in. gravel apron around pad for condensate drainage.

II. RIG AND PLACE UNIT

Inspect unit for transportation damage. File any claim with transportation agency. Keep upright and do not drop. Level by using unit frame as a reference. See Table 1 for additional information. Weight is shown in Fig. 2-4. Unit can be moved with handholds provided in the unit basepan.

MAXIMUM ALLOWABLE

DIFFERENCE (in.)

A-B	B-C	A-C
1¤4	1¤4	1¤4

Fig. 5 Ð Unit Leveling Tolerances

NOTES:

1.Extend a 24-in. gravel apron around pad.

2.Provide a 30-in. service clearance at front and rear sides of unit.

Fig. 6 Ð Pad Dimensions

III.UNIT DUCT AND FIELD CONNECTIONS A. Condensate Disposal

NOTE: Ensure that condensate-water disposal methods com- ply with local codes, restrictions, and practices.

Units remove condensate water through a 3¤4-in. ID hole lo- cated on the control box side of the unit.

Condensate water can be drained directly onto a gravel apron in ground-level installations. Install a ®eld-supplied conden- sate trap at end of condensate connection to ensure proper drainage. See Fig. 7. Make sure that the outlet of the trap is at least 1 in. lower than the drain pan condensate connection to prevent the pan from over¯owing. See Fig. 8A and 8B. Prime the trap with water. When using a gravel apron, make sure it slopes away from the unit.

Ð5Ð