Nautel NX100, Руководство по предварительной установке

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NX100 Pre-installation Manual Cooling requirements
Issue 3.2 2017-03-31 Page 4-5
Closed loop or forced air cooling systems
Intake Requirements.
Closed loop or forced air cooling systems can be used, so long as the air is
well filtered to prevent dust and insects from entering the transmitter, and so long as a minimum of
1,500 cubic feet per minute (CFM) at 0.5 pounds per square inch (PSI) is supplied to the intake duct.
Exhaust Requirements.
1,500 cubic feet per minute (CFM) .
Note:
To ensure specified operation, the transmitter’s fans cannot drive any extra back-pressure.
Therefore, Nautel recommends that the exhaust duct system include exhaust fans.
Nautel recommends you leave a gap between the top of the transmitter and the bottom of the
exhaust hood, as shown in
Figure 4.3 .
Figure 4.3: Gap for Exhaust Air
This gap will serve two purposes:
1. For air conditioned closed loop systems, the maximum air temperature into the evaporator
may be limited to 35°C (95°F). By ensuring an adequate gap (as shown), the fan for the
evaporator can be selected to draw more air than the rack will exhaust, allowing room air to
mix with the warmer exhaust air from the transmitter, thus reducing the evaporator’s intake
temperature.
2. If the cooling system’s exhaust fan fails or the exhaust duct is blocked, the transmitter is still
able to exhaust into the room.
CAUTION: The cooling system’s evaporator may have a maximum air
temperature capability [typically 35˚C (95˚F)]. If so, note that the maximum
temperature rise from the transmitter’s intake to exhaust is 20˚C.