AT&T Release 2.0 Electrical Noise/Radio-Frequency Interference RFI, Environmental Requirements

Installing the Control Unit

Table 2-1. Environmental Requirements

Operating Temperatures

Humidity

Airborne Contamination

Ventilation

Electrical

Fields

Heat Dissipation

40° - 104°F (4° - 40°C)

Optimum temperature: 60°F (15.6°C)

2 0 % - 8 0 %

Do not expose the control unit to moisture, corrosive gases, dust, chemicals, spray paint, or similar material.

Allow at least 1 inch (2.54 cm) on the right and left sides of the control unit and 12 inches (31 cm) above and below to prevent overheating.

Do not place the control unit near extreme heat (for example: furnaces, heaters, attics, or direct sunlight).

Do not expose the control unit to devices that generate electrical currents causing interference (such as arc welders or motors).

Basic carrier: 500 BTU/hr

Basic carrier with one expansion carrier: 1000 BTU/hr

Basic carrier with two expansion carriers: 1500 BTU/hr

WARNING:

Do not install the control unit outdoors.

Electrical Noise/Radio-Frequency Interference (RFI)

In most cases, electrical noise is introduced to the system through trunk or telephone cables. However, electromagnetic fields near the control unit may also induce noise in the system. Therefore, the control unit and cable runs should not be placed in areas where a high electromagnetic field strength exists.

Preparation 2-3