Frick RWF II 856 - Page 63

070.610-IOM (JUL 21)
Page 63
RWF II Rotary Screw Compressor Units
Maintenance
Figure 63: P and I diagram, liquid injection – single port
LIQUID REFRIGERANT
FROM RECEIVER
S
STRAINER
SOLENOID
VALV E
MOTORIZED
EXPANSION
VALV E
SIGHT
GLASS
LIQUID LINE
TUBING LINE
COMPRESSOR LOW VI,
HIGH VI, ECONOMIZER,
OR CLOSED THREAD
Figure 64: P and I diagram, liquid injection – dual port (new design)
TUBING LINE
LIQUID
LINE
SIGHT GLASS
MOTORIZED
EXPANSION
VALV E
SOLENOID
VALV E
STRAINER
S
9
YY
COMPRESSOR
LOWVI
COMPRESSOR
HIGH VI
TO SEPARATOR
COMPRESSOR
SUCTION PRESS.
LIQUID REFRIGERANT
FROM RECEIVER
S
TUBING LINE
LIQUID
LINE
SIGHT
GLASS
MOTORIZED
EXPANSION
VALV E
3-WAY
MOTORIZED
VALV E
SOLENOID
VALV E
STRAINER
S
COMPRESSOR
LOWVI
COMPRESSOR
HIGH VI
LIQUID REFRIGERANT
FROM RECEIVER
M
Figure 65: P and I diagram, liquid injection – dual port (old design)