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45
9.0 DIAGNOSTICS & TROUBLESHOOTING
Diagnostics
9.9 Service Analyzer Charts (cont.)
FLOODING
SYMPTOM
POSSIBLE CAUSE
REMEDY
Poor system control
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Loose sensing bulb
Secure the bulb and insulate.
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Relocate bulb.
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Use correct replacement.
Improper superheat setting (less than 5°F [2.8°C])
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THERMOSTATIC EXPANSION VALVE (TXV)
SYMPTOM
POSSIBLE CAUSE
REMEDY
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Suction Pressure
(superheat over
15°F [8.3°C])
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recharge.
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recharge.
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Correct the charge.
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Remove restriction in liquid line. Correct the refrigerant
charge.
Remove noncondensible gases.
Size liquid line correctly.
Misapplication of internally equalized valve
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Plugged external equalizer line
Remove external equalizer line restriction.
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superheat and higher
than normal suction
pressure
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and recharge.
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open
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and recharge.
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the cause). NOT APPLICABLE TO BLEED PORT
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Incorrect sensing bulb location
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Incorrectly installed, or restricted external
equalizer line
Remove restriction, or relocate external equalizer.