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Installing the Control Unit
Table 2-1. Environmental Requirements
Operating
Temperatures
40° - 104°F (4° - 40°C)
Optimum temperature: 60°F (15.6°C)
Humidity
20%-80%
Airborne
Contamination
Do not expose the control unit to moisture, corrosive gases,
dust, chemicals, spray paint, or similar material.
Ventilation 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).
Electrical
Fields
Do not expose the control unit to devices that generate
electrical currents causing interference (such as arc
welders or motors).
Heat
Dissipation
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