Goodman ASX Service Instructions Manual page 29

SYSTEM OPERATION
EXPANSION VALVE/CHECK VALVE ASSEMBLY
EXPANSION VALVE/CHECK VALVE ASSEMBLY
IN COOLING OPERATION
IN HEATING OPERATION
®
Most expansion valves used in current Amana Brand Heat Pump products
use an internally checked expansion valve.
This type of expansion valve does not require an external check valve as shown above.
However, the principle of operation is the same.
RESTRICTOR ORIFICE ASSEMBLY RESTRICTOR ORIFICE ASSEMBLY
IN COOLING OPERATION IN HEATING OPERATION
In the heating mode, the orifice moves back off its
In the cooling mode, the orifice is pushed into its
seat, allowing refrigerant to flow unmetered around
seat, forcing refrigerant to flow through the metered
the outside of the orifice.
hole in the center of the orifice.
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