Thermo Scientific System IV, Installation, Operation, Basic Maintenance

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Section IV Operation
Start Up
Before starting the unit, double check all electrical and plumbing connections
and make sure the circulating system (the System III, your application, and
the tubing that connects them) has been properly filled with cooling fluid.
Turn the RECIRCULATING FLOW CONTROL to “0”. Press START/STOP.
The pump starts and the controller displays the reservoir fluid temperature.
The low fluid level monitor in the reservoir prevents the unit from operating if
the fluid level in the reservoir is below the safe operating level. By slightly,
and/or intermittently opening the RECIRCULATING FLOW CONTROL
(toward “+”) and using extra cooling fluid to keep the reservoir topped off,
the system can be filled without repeated tripping of the monitor.
If the unit shuts down, top off the reservoir and restart it. When the system
is full, the reservoir level will no longer drop when the RECIRCULATING
FLOW CONTROL valve is opened (toward “+”).
A control valve, located in the FACILITY WATER inlet line, regulates the
flow rate of the cooling water supply as it enters the unit. The valve regulates
the flow rate based on the heat load. Flow through the unit stops automati-
cally when the unit is shut off.
Temperature Controller
To turn the unit off, press START/STOP. The recirculation pump will stop.
The IDLE and COOL lights indicate the control valve’s status. When the
temperature control valve is wide open (for maximum cooling), the COOL
light is on steady. When the control valve is closed, the IDLE light is on. As
the control valve moves between these extremes, the two lights flash with
varying on-time to indicate the approximate position of the control valve.