Humboldt H-1394 Deluxe Water Baths - Manual (Page 5)

Operation
Once you have completed set-up and have filled the water bath with water. You
are ready to operate the bath. To turn the unit on, Push the POWER switch down
to turn it on. The heating indicator to the left of the POWER switch will illuminate
and show you the current temperature of the bath on top of the controller in red
and the current set point, on the bottom in green.
At this point you can also turn on the spin bar by pushing down on the STIR
switch.
Use the arrows on the controller to set the desired temperature you would like
to operate the bath at, i.e. the setpoint. The setpoint is the lower number, which
is in green. Humboldt Deluxe Water Baths are only capable of heating the bath,
there is no cooling function.
Once you have set the setpoint for the bath, the heating element will begin
to heat the bath. This will be indicated by a flashing light to the right of the
actual temperature reading, the top number on the controller. Once the bath
temperature has stabilized at the desired temperature, the heat pilot light will
cycle on and off as the thermostat calls the heaters to maintain that temperature.
Typical time to heat a bath from 70°F to 140°F is 1 hour.
Figure #2