Friedrich 000, 24, 60 Unit Configuration, Indoor and Outdoor AIR Requirements, Outdoor Air System

Figure 4 Unit Configuration

1) INDOOR AND OUTDOOR AIR REQUIREMENTS

The indoor and outdoor air systems are designed to operate at specified airflow rates and external static pressures. The supply and return air duct system pressure losses (including filter, louver/grille and registers) must not exceed the listed external static pressures for either the indoor or outdoor air systems.

CAUTION: Failure to adhere to indoor air and outdoor air requirements as listed in the following sections will void unit warranty.

A.Outdoor Air System

As a completely self-contained system, the Vert-I-Pak unit requires an adequate supply of outdoor air to exchange heat from the outdoor air coil. The outdoor air intake and discharge openings are located on the back side of the unit. The unit may be installed where the outdoor air path runs through the wall of the building directly behind the unit or where the outdoor air intake and discharge paths are ducted separately away from the unit. Figure 9 shows two typical ducted OA designs.

CAUTION: To ensure proper operation, the outdoor air intake and discharge air paths must be free and unobstructed. The two air paths must be situated to ensure that the intake and discharge air do not recirculate (also called short-circuit).

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