Shellab SWB715-2 - 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 controls all power to the unit. It must be in the I position to be ON and the
green power on light illuminated before any systems are operational. The on/off switch must remain easily
accessible at all times. The W614M is equipped with separate switches for each tank.
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. Separate controls are used on the W614M to control temperature in
the respective tanks.
Fuses
The fuses are located at the back of the unit within the power inlet plug and 220v units also have a fuse holder
located next to the inlet. The fuses act as a circuit breaker and will cut off power to the unit if there is an electrical
surge or malfunction. The cause should be determined and corrected before placing the fuse. Fuses must be in
place for the unit to operate.
Over Temperature Limit Thermostat (OTL)
This controller is marked “Set Over Temp Control” 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. The W614M has separate controls for each of the tanks.
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 Limit Thermostat has been activated. Under normal operating
conditions this light should never be on.
Section
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