I. LOCATE THE UNIT
A. Clearance
Provide sufficient space for condenser air¯ow clearance, wir- ing, and servicing unit. See Fig.
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.
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.
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.
MAXIMUM ALLOWABLE
DIFFERENCE (in.)
1¤4 | 1¤4 | 1¤4 |
Fig. 5 Ð Unit Leveling Tolerances
NOTES:
1.Extend a
2.Provide a
Fig. 6 Ð Pad Dimensions
III.UNIT DUCT AND FIELD CONNECTIONS A. Condensate Disposal
NOTE: Ensure that
Units remove condensate water through a
Condensate water can be drained directly onto a gravel apron in
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