360 Systems 2470SD Time Delay - Manual (Page 9)

Introduction & Features 9
There are four adhesive-backed rubber feet on the Time Delay. These may need to be removed
when rack mounting the unit.
In North America, the Time Delay will usually be mounted in a 19” rack enclosure having 10-24 or
10-32 tapped holes. In countries with metric standards, the user will need to supply appropriate
fasteners.
Cables attached to the rear of the Time Delay should be supported by the rack mounting rails. Do
not support substantial cable weight from the Time Delay.
Remove the front panel to expose the rack screw slots. Fasten the Time Delay into the rack using
#10 flat-head Phillips screws (provided in North America). Replace the front panel. Tighten the
front panel access screws.
Important Installation Notes
System Cooling
When many pieces of equipment are mounted in an equipment rack, a considerable amount of heat
may be produced, which must be removed efficiently. Further, a lower operating temperature will
make equipment operate more reliably, and it will last longer. In the extreme case, excessive
temperatures cause rapid equipment failure, and damage which can be difficult to repair.
Heat in an equipment rack should be removed by forced air. This is often accomplished by blowers
installed in the top of the rack, venting into the room. An alternative is to draw hot air from the top
of the rack into an air-conditioning return duct, and not vent it into the equipment room; cold air
should be ducted into the bottom of the rack.
The optimum air temperature for cooling electronic equipment is 25° C (72° F). When many
pieces of equipment are contributing to the heat load, a substantial air-flow will be needed, and the
inlet temperature may need to be lower.
Check These Points
• Are all ventilation holes in the Time Delay free of obstruction?
• Can blowers or HVAC system adequately remove heat from the equipment rack?
• Have you measured the actual temperature inside the rack? Do this near the top.
• Verify that the HVAC system is not on a timer that can shut off on weekends or holidays.
• What procedures are in place to protect the equipment when the HVAC system fails?