Thermo Scientific Thermo Scientific 3906, Operating Manual

Page: 48 / 104

| Handling and Control
8-2
|
Model 3900 Series Thermo Scientific
Chapter 8
Figure 8-2
Main Power
Figure 8-3
Switches
Switch and Indicator Light (Figure 8-3).
The refrigeration switch controls power to the refrigeration system. The refrigeration
indicator lights when the refrigeration switch is on and the compressor is receiving power.
Defrost Switch and Indicator Light (Figure 8-3).
The defrost switch controls power to the defrost system. Setting the defrost switch to Auto
will provide two 15-minute defrost cycles during a twenty-four hour period. The defrost
indicator lights when the defrost switch is on and the environmental chamber is in a
defrost cycle.
Humidity Switch and Indicator (Figure 8-3)
The humidity switch controls the power to the humidification system circuit. The humidity
indicator light will cycle as the controller toggles between humidify and dehumidify.
Dehumidify Switch and Indicator (Figure 8-3)
Indicator lights
Indicator lights
Dehumidify
Switch
Defrost
Switch
Humidify
Switch
Refrigeration
Switch
The defrost switch must be set to Auto when the temperature setpoint is 10°C, or
below.
NOTE
When set temperature is above 10°C and the defrost switch is set to Auto,
periodic temperature inconsistencies can occur.