(Figure 3). Since the FLASC chamb er is at a lower pressure, pa rt of the liquid refrigeran t flashes
to vapor, thereb y cooling the remaining liqui d. The FLASC v apor is reconde nsed on the tubes
which are cooled by enter in g c ond ens e r wat er. The liqu id drains into a float ch ambe r between
the FLASC chamber and cooler. Here a float valve forms a liquid sea l to keep FLASC chamber
vapor from entering the cooler. When liquid refr ig erant passes throug h th e valve, some of it
flashes to vapor in the reduced pressure on the coo ler side. In flashing, it removes heat from the
remaining liquid. The r ef rigerant is now at a temp er at ure and pressure at whi ch the cycle
began.
Motor/Oil Refri geration Cooling C ycle
The motor and the lubricating oil are cooled by liqu id refrigerant t aken from the bott om of the
condenser vessel (Figure 3). Flo w of refrigera nt is maintained by the pressur e differential that
exists due to compressor opera tion. After the refrigerant flows past an isolation valve, an in-l ine
filter, and a sight glass/moisture indi cator, the flow is s plit between motor cooling and oil cool ing
systems.
Flow to the motor flows thr oug h an orifice and into the m ot or. There is also anothe r orifice
and a solenoid valve whic h wi ll open if additional mot or cooling is required . Once past the
orifice, the refriger an t is directed over the mo to r by a sp r ay noz z l e. The refrigerant co lle cts in
the bottom of the motor cas ing and then i s drained back i nto the cooler through the motor
refrigerant drain line. A back pressu re valve or an orif ice in this line ma intains a higher p ressure