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RXB PLUS ROTARY SCREW COMPRESSOR UNITS
OPERATION
070.101-IOM (JAN 13)
Page 32
SINGLE-PORT LIQUID INJECTION
The.single-port.liquid.injection.system.is.designed.to.permit.
liquid.refrigerant.injection.into.one.port.on.the.compressor.
at.any.given.moment.and.operate.as.outlined.
Solenoid. valve. SV7. is. energized. by. the. microprocessor.
when.the.temperature.element.(TE3),.installed.in.the.piping.
after.the.oil.filter,.exceeds.the.LICO.setpoint..High.pressure.
liquid.refrigerant.is.then.supplied.to.the.tempera.ture.control.
valve.TCV1..The.temperature.control.valve.is.equalized.to.
a.constant.back.pressure.by.the.differen.tial.pressure.con-
trol.valve.PDCV.(see.
LIQUID INJECTION ADJUSTMENT
PROCE DURE
)...The.differential.pressure.control.valve.uses.
dis.charge.gas.to.maintain.downstream.pressure..The.gas.
downstream.of.the.differential.pressure.control.valve.is.bled.
off.to.the.compres.sor.suction.to.ensure.steady.and.constant.
operation.of.the.valve.
BOOSTER APPLICATION
.-.Discharge.gas.from.the.high-.
stage.compressor.is.required.to.assist.the.differen.tial.pres-
sure. control. valve. (PDCV). in. providing. the. temperature.
control.valve.(TCV).with.a.constant.back.pressure.
A. solenoid. valve. SV6. is. installed. before. the. differential.
pressure.control.valve.(PDCV).to.prevent.migration.of.high.
pressure.gas.during.shut.down.
COMPRESSOR OIL COOLING SYSTEMS
The.
RXB PLUS
.unit.can.be.equipped.with.one.of.several.
systems.for.controlling.the.compressor.oil.tempera.ture..They.
are. single. or. dual-port. liquid. injection,. thermo.syphon. or.
water-cooled. oil. coolers.. Each. system. is. automati.cally.
controlled,. independent.. of. compressor. loading. or. unload-
ing..Oil.cooling.systems.maintain.oil.temperature.within.the.
following.ranges:
LIQUID INJECTION
EXTERNAL*
OIL COOLING
OIL COOLING
.
R-717..110.-.130°F..
110.-.130°F
*.Thermosyphon. oil. cooling. (TSOC). or.Water-cooled. oil.
cooling.(WCOC).
Содержание Frick RXB Plus 12
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