Johnson Controls Frick RWF II User Manual

RWF II ROTARY SCREW COMPRESSOR UNITS
OPERATION
070.610-IOM (JUN 11)
Page 17
SINGLE-PORT LIQUID INJECTION
The singleport liquid injection system is desig ned to permit
liquid refrigerant injection into one port on the compressor
at any given moment and operates as outlined.
The liquid injection solenoid valve is energized by the micro
processor when the temperature sensor, in stalled in the
compressor discharge, exceeds the setpoint. Highpressure
liquid refriger ant is then supplied to the tempera ture control
valve (TCV). Refer to P & I DIAGRAMS section for piping
and instrumentation drawings.
Figure 19 - Port Locations
DUAL-PORT LIQUID INJECTION
The dualport liquid injection system is design ed to obtain
the most efcient compressor performance at high and low
compression ratios by permitting injection of liquid refriger ant
into one of two ports optimally located on the com pressor.
This minimizes the performance penalty incurred with liquid
injection oil cooling.
The dualport system contains all the com ponents of the
singleport system with the addition of a doubleacting
solenoid valve and operates as outlined.
The liquid injection solenoid valve is energized by the micro
processor when the temperature sensor, in stalled in the oil
manifold, exceeds the setpoint. Liquid refrigerant is then
passed through the tempera ture control valve (TCV) to the
doub leacting solenoid valve. Depending on the compres
sor’s operating volume ratio (Vi), the micropro cessor will
select the ow of the liquid refrigerant to the optimum
com pressor port.

Johnson Controls Frick RWF II Specifications

General

Brand	Johnson Controls
Model	Frick RWF II
Category	Air Compressor
Language	English