R— CLOSED-LOOP COOLERS
Self-Contained Recirculating Chillers

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Closed-Loop coolers recirculate coolant from a tank mounted in the cooler, through a sealed coolant loop and heat load (spindle) and back to the tank. The tank, pump, and evaporator are all in the cooler.

Coolant is added to the tank through a filler/breather port. The coolant level is always visible in the tank level gauge. When the pump is energized, it draws coolant from the tank and pumps it through the coolant loop. The coolant absorbs heat from the heat load and then dissipates it in the evaporator before returning to the tank. The temperature controller senses the temperature of the coolant leaving the tank and controls the refrigeration effect in the evaporator to provide coolant at the desired discharge temperature.
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RO— OPEN-LOOP COOLERS
Recirculate Fluid from a Remote Tank

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Open-Loop coolers recirculate fluid from a remote tank, through the cooler and back to the tank. The cooler works to maintain a constant fluid temperature in the tank. The pump and evaporator are in the cooler. The tank is remote.

When the pump is energized it draws fluid from the remote tank and pumps it through the evaporator in the cooler and back to the tank. The temperature controller senses the temperature of the fluid entering the cooler and controls the refrigeration effect in the evaporator to provide the desired fluid temperature in the tank. The cooler should be installed as near as possible to the tank.
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IL— IN-LINE COOLERS
Pump Fluids Through the In-Line Cooler

In-Line coolers cool fluid that is passing through under pressure. Only the evaporator is in the cooler. Both the pump and tank are remote.

These coolers are often used in applications where it is advantageous to have the pump mounted on or near the tank to recirculate fluid through the cooler and back to the tank. This type of installation is necessary when the cooler is installed too far above or away from the tank to allow for the use of an Open-Loop cooler. The temperature controller senses the temperature of the fluid entering the cooler and cycles the refrigeration effect to maintain the desired fluid temperature in the tank.
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DI— DROP-IN COOLERS
Space-Saving Design to Cool Fluids in a Tank

Drop-In coolers are designed to be mounted on top of a tank to cool the fluid that is passing through it. The stainless steel immersion coil type evaporator is submerged into the fluid in the tank. A small agitation pump continuously moves the fluid around the evaporator coils ensuring proper heat transfer. The temperature controller senses the fluid temperature and controls the refrigeration effect to maintain the fluid in the tank at the desired temperature.

Drop-In coolers save floor space and are ideal for installation on tanks where the coolant is too dirty to pump through a heat exchanger. The cooler can readily be lifted out for tank cleaning or inspection.
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