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High superheat and high subcooling
n. Low suction pressure and high head pressure
High superheat and high subcooling
o. low to normal suction pressure and high head pressure
High to normal superheat and high subcooling
restricted
n. Liquid line restricted before
receiver
o. Condenser restricted
6. Valve Operation
SPINDLE BACK POSITION SPINDLE FRONT POSITION SPINDLE MIDDLE POSITION
Fig. 2.2 Valve Operation
Back Position: Process and manometer port closed for normal operation
Front Position: Main connection to liquid or suction line closed
Middle Position: All ports open for vacuum, charge and measurement