8.2 Electronic expansion valve check procedure
Valve position Electronic expansion valve
Locked fully closed
Check the temperature of the piping in the heating process.
Failure of the temperature to rise indicates a fault.
Locked slightly open The following conditions indicate a fault:
• Where the freeze protection thermistor temperature is
lower than the intake air temperature.
• Where the unit being inspected stops and other units
continue operating in cooling mode.
Locked fully open
8 Troubleshooting
233
SMGB0063 rev. 1 - 10/2010
8
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