Condensing Unit & Heat Pump R410A Service Manual

82
SYSTEM OPERATION
EXPANSION VALVE/CHECK VALVE ASSEMBLY IN
COOLING OPERATION
EXPANSION VALVE/CHECK VALVE ASSEMBLY IN
HEATING OPERATION
Most expansion valves used in current Amana Heat Pump products use an internally checked expansion valve. This type
of expansion valve does not require an external check valve as shown above.
Restrictor Orice Assy in Cooling Operation
Restrictor Orice Assy in Heating Operation
In the cooling mode, the orice is pushed into its seat,
forcing refrigerant to ow through the metered hole in the
center of the orice.
In the heating mode, the orice moves back o󰀨 its seat,
allowing refrigerant to ow unmetered around the outside of
the orice.