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Factory-Mounted Starter or Variable Fre- quency Drive (Optional) — The starter allows for the proper start and disconnect of electrical energy for the com- pressor-motor, oil pump, oil heater, and control panel. StorageVessel(Optional)—There are 2 sizes of storage vessels available. The vessels have double relief valves, a magnetically-coupled dial-type refrigerant level gage, a one-inch FPT drain valve, and a 1/2-in. male flare vapor con- nection for the pumpout unit. NOTE: If a storage vessel is not used at the jobsite, factory- installed isolation valves on the chiller may be used to isolate the chiller charge in either the cooler or condenser. An optional pumpout system is used to transfer refrigerant from vessel to vessel. REFRIGERATION CYCLE The compressor continuously draws refrigerant vapor from the cooler at a rate set by the amount of guide vane opening or compressor speed (19XRV only). As the compressor suction reduces the pressure in the cooler, the remaining refrigerant boils at a fairly low temperature (typically 38 to 42 F [3 to 6 C]). The energy required for boiling is obtained from the wa- ter flowing through the cooler tubes. With heat energy re- moved, the water becomes cold enough to use in an air condi- tioning circuit or for process liquid cooling. After taking heat from the water, the refrigerant vapor is compressed. Compression adds still more heat energy, and the refrigerant is quite warm (typically 98 to 102 F [37 to 40 C]) when it is discharged from the compressor into the condenser. Relatively cool (typically 65 to 90 F [18 to 32 C]) water flowing into the condenser tubes removes heat from the refrig- erant and the vapor condenses to liquid. The liquid refrigerant passes through orifices into the FLASC (Flash Subcooler) chamber (Fig. 3). Since the FLASC chamber is at a lower pressure, part of the liquid refrigerant flashes to vapor, thereby cooling the remaining liquid. The FLASC vapor is recondensed on the tubes which are cooled by entering condenser water. The liquid drains into a float cham- ber between the FLASC chamber and cooler. Here a float valve forms a liquid seal to keep FLASC chamber vapor from enter- ing the cooler. When liquid refrigerant passes through the valve, some of it flashes to vapor in the reduced pressure on the cooler side. In flashing, it removes heat from the remaining liq- uid. The refrigerant is now at a temperature and pressure at which the cycle began. MOTOR AND LUBRICATING OIL COOLING CYCLE The motor and the lubricating oil are cooled by liquid re- frigerant taken from the bottom of the condenser vessel (Fig. 3). Refrigerant flow is maintained by the pressure differ- ential that exists due to compressor operation. After the refrig- erant flows past an isolation valve, an in-line filter, and a sight glass/moisture indicator, the flow is split between the motor cooling and oil cooling systems. Fig. 3 — Refrigerant Motor Cooling and Oil Cooling Cycles 7PDF Image | 19XR,XRV Hermetic Centrifugal Liquid Chillers 50/60 Hz With PIC II Controls and HFC-134a
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