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Secondary Overtemp
Thermostat
Thermo Scientific
In the unlikely event that the programmed hi-limit and the user-adjustable
hi-limit thermostats fail, there is a third overtemperature thermostat. Two
of these thermostats are located on the bottom of the water pan. If the
water bath fails to heat with the "HEAT ON" lamp lit and the user-
adjustable hi-limit thermostat set to the fully clockwise position, it will be
necessary to reset the secondary over temperature thermostat. To do so,
proceed as follows:
1. Disconnect power cord from outlet.
2. Remove rear panel.
3. Locate the thermostat access opening located in the insulation retainer
just above the shaker mounting plate. These holes are not visible and
must located by feel. Each thermostat has a small button that needs to
be pressed in to reset the thermostat.
4. Reset both thermostats by reaching in under the insulation retainer
and pressing the button on each of the two thermostats located near
the center of the access hole.
5. Once both thermostats are reset, reinstall the rear panel, plug the
power cord back into the outlet and verify the unit is heating again.
6. If the shaker still fails to heat, contact Technical Services for further
assistance.
REAR PANEL VIEW
Insulation Retainer
Figure 7-2. Locations on back
Shaker Mounting Plate
Section 7
Maintenance
Over Temperature
Thermostat Located
Underneath
MaxQ 7000
7-3
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