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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 low fluid level 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 automatically
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 valves 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.
Summary of Contents for NESLAB System III
Page 23: ... 21 TU Pump Flow Diagram Optional ...
Page 25: ... 23 Large Volume Units ...
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