About Thermal Operation (ET Models only)
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EnviroNET User Manual
4 • Operating the EnviroNET
About Thermal Operation (ET Models only)
The ET model is the only EnviroNET model that includes a heater. The ET unit will not turn on at -40ºC (-
40ºF). The heater controller monitors the temperature until it is warm enough to turn on the device. The
device inside cannot be turned on below 0ºC (32ºF).
The heater controller will automatically start warming the inside of the unit until the internal temperature is
above 0ºC (32ºF). During that warm-up period, the Temperature Control Indicator LED will light. The unit
will take 20-30 minutes to power on from a cold start at -40ºC (-40ºF). Of course, warmer ambient tempera-
tures will shorten this warm-up time.
Once the unit powers on, the unit will stay powered on when ambient temperatures drop below 0ºC (32ºF).
At those times, the heater will turn on to maintain the proper internal temperature. The Temperature Control
Indicator LED will light when the heater is on.
The fan will speed up cooling and heating times.
Operating the EnviroNET
If the EnviroNET has been configured correctly, it should operate normally without user intervention.
Because the EnviroNET Ethernet Extenders are configured using dip switches on the PC board, it is best to
power down the unit before changing the configuration of the dip switches.
