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The TXV has several forces acting upon it. The pressure of the
refrigerant entering the evaporator, the spring pressure in the
valve and the pressure on the diaphragm from the bulb. As
the temperature of the bulb at the evaporator outlet increases,
the pressure of the refrigerant in the bulb forces the valve
open. Although the TXV is designed to maintain a superheat of
approximately 10°F (T3b – T3a), a range of 7°F - 18°F is
considered normal.
The valve operation can also be monitored by T3a temperature
based on room temperature (T5 sensor).
T5 T3a
60°F 47°F +/- 3°F
70°F 48°F +/- 3°F
90°F 65°F +/- 3°F
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