GUIDE SPECIFICATIONS — INDOOR UNIT (cont)
5. Return Air Grille:
Grille shall be factory supplied for field installation on
the unit’s return air opening.
6. Unit Subbase:
Subbase assembly shall be factory supplied for field
installation. Subbase shall elevate floor-mounted ver-
tical units to provide access for correct condensate
drain connection.
7. Economizer:
Economizer for ventilation or ‘‘free’’ cooling shall be
factory provided for field installation. For free cooling
applications, economizer shall be compatible with
factory-supplied thermostat; economizer dampers
shall open when outdoor air enthalpy is suitable for
free cooling. Economizer shall include enthalpy con-
trol and damper actuator.
8. Overhead Suspension Package:
Package shall include necessary brackets to support
units in a horizontal ceiling installation.
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