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Thermo Scientific
Set Door Heater Control
High voltage is present behind control panel. Servicing must be performed only
by qualified electrical service personnel.
The infinite heater control is located in the left side of the environmental chamber top
compartment behind the control panel door. The control varies the amount of door
heat from no heat (zero) to full heat (100) as indicated by the dial face. If the knob is
turned past zero, a "click" indicates that all power to the door is shut off. If turned
past 100, a similar "click" indicates that the heat is set at maximum.
Figure 13-2 Door Heater Control
Initially, the units leave the factory with the dial set at 40. If desired, the amount of
heat can later be reduced until moisture appears on the door. However, in fluctuating
ambient conditions, it is recommended that a minimum of 40% door heat be used.
Service |
Chapter 13
Model 3900 Series | 13-3
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