Shellab SWB30-2 - Manual (Page 8)

Microprocessor Control Water Baths 8
CONTROLS OVERVIEW
This section provides an overview of the panel controls. See Figure 1 for an illustration of the panel
controls.
Figure 1. Control Panel
Power Switch
The Green I/O (On/Off) power switch, located in the top right hand corner of the control panel, controls all
power to the unit. It must be in the I position to be ON and illuminated before any systems are operational.
The on/off switch must remain easily accessible at all times.
Main Temperature Controller
This control is marked SET TEMPERATURE and consists of the digital display and UP and DOWN arrow
pads for inputting set point temperatures and calibration.
Fuses
The fuses are located at the back of the unit within the fuse holders. The fuses act as a circuit breaker
and will cut off power to the unit if there is an electrical surge or malfunction. The fuses must be in place
for the unit to operate. Please contact customer service for more information.
Over Temperature Limit Thermostat (OTL)
This controller is marked “Set Over Temperature” and is completely independent of the Temperature
Controller. The OTL guards against any failure of the Temperature Controller that would allow the
temperature to rise past set point. If the temperature rises to the OTL set point, the OTL takes control of
the heating element and allows continued use of the water bath until the problem can be resolved or
service can be arranged. The OTL is manually adjusted with a screwdriver or coin so accidental
adjustment cannot occur.
Heating Activated
This light is ON when the Temperature Controller has activated the heating element to reach and maintain
set point.
Over Temperature Activated Light
This light is ON when the Over Temperature Safety Thermostat has been activated. Under normal
operating conditions this light should never be on.
Section
5