Thermo Scientific Thermo Scientific 3906, Operating Manual

Page: 43 / 104

Thermo Scientific Model 3900 Series | 6-1
Start-Up |
Chapter 6
Start-Up
When the humidification system is operational, the environmental chamber may be
started. Preset the controls as follows:
Set the Overtemp Safety Thermostat
For best overall performance of the environmental chamber, the refrigeration switch
should be turned On for most applications. When running Low or No humidity at high
temperatures, the refrigeration switch may be turned Off.
Allow the chamber temperature and humidity to stabilize, then set the overtemp safety
thermostat as follows:
1. Turn the overtemp control knob slowly counterclockwise until the audible alarm
sounds and the overtemp indicator lights.
Parameter Unit
Overtemp Safety Thermostat Fully Clockwise
Undertemp Safety Thermostat Fully Counterclockwise
Main Power Switch ON
Humidity Controller Desired Setpoint
Temperature Controller Desired Setpoint
Door Heater 40% (factory set)
NOTE

When operating the environmental chamber with a light module, always
switch on the cooling

Observe temperature display on the device
The defrost switch must be set to “Auto” when the temperature setpoint is 10°C
or below.