Nautel VS300 Preinstallation Manual

Also see for VS300: Quick start guide Installation manual Operation and maintenance manual Troubleshooting manual Troubleshooting manual

Nautel VS300 Preinstallation Manual Manual pdf 28 page image

VS300 Pre-installation Manual Cooling requirementsPage 4-2 Issue 2.0 2010-12-01CoolingDo not allow the transmitter room ambient air temperature to exceed 50°C (122°F) at sea level.Cooler temperatures are recommended in order to improve the reliability of the transmitter. Athigher altitudes, derate the maximum inlet air temperature as follows:• De-rate the ambient temperature 3ºC (5.4°F) per 500 m – or 2ºC (3.6°F) per 1,000feet – above sea level.Example: At 1600 m (1 mile) above sea level, maximum ambient temperature should notexceed 40.4ºC (104.7°F).Cooling plant requirementsTable 4.1: Cooling plant requirementsCalculating BTU cooling requirementsTo determine the number of British thermal units (Btu) being generated per hour as waste heat,multiply the waste heat (in watts), which is derived from the transmitter output power and its typicalefficiency, by 3.413.HeatingThe transmitter room must contain a heating system that will ensure the ambient air temperaturedoes not drop below 0°C (32°F).CAUTION: Ensure that hot air from the transmitter is not drawn back intothe transmitter’s cool air intake.Mode ofoperationTransmitteroutput (watts)Worst-caseEfficiency(%)Wasteheat (watts) BTU/hourAirconditioningrequired in aclosedsystem(tonnes)FM 330 58 240 816 0.068