Factory-Mounted Starter (Optional) —
The starter
allows for the proper start and disconnect of electrical en-
ergy for the compressor-motor, oil pump, oil heater, and con-
trol panel.
Storage Vessel (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
connection 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 iso-
late 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.
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 water flowing through the cooler
tubes. With heat energy removed, the water becomes cold
enough to use in an air conditioning 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 re-
frigerant and the vapor condenses to liquid.
The liquid refrigerant passes through orifices into the FLASC
(Flash Subcooler) chamber (Fig. 3). Since the FLASC cham-
ber 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 en-
tering 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
entering 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 re-
maining liquid. 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 dif-
ferential that exists due to compressor operation. After the
refrigerant 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
7
Summary of Contents for HERMETIC CENTRIFUGAL LIQUID CHILLERS 19XR
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