SYSTEM OPERATION
25
Indoor
Coil
Outdoor
Coil
Thermostatic
Expansion
Valve
Chatleff
Orifice
Assy
Typical Package Cooling or Package Gas
Expansion Valve/Check Valve Assy in Cooling Opera-
tion
Expansion Valve/Check Valve Assy in Heating Opera-
tion
Restrictor Orifice Assy in Cooling Operation Restrictor Orifice Assy 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.
In the cooling mode the orifice is pushed into its seat forcing
refrigerant to flow through the metered hole in the center of
the orifice.
In the heating mode the orifice moves back off its seat allow-
ing refrigerant to flow unmetered around the outside of the
orifice.
Either a thermostatic expansion valve or restrictor orifice assy
may be used depending on model, refer to the parts catalog
for the model being serviced.
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