Service Analyzer Charts
FLOODING
SYMPTOM POSSIBLE CAUSE REMEDY
Poor system control
using an EEV
Bad pressure reading Check transducer wiring
Suction thermistor in wrong location Replace thermistor
Bad suction thermistor Replace thermistor
Improper superheat setting less than 5 [-15]
Adjust EEV SH setpoint dipswitches and validate valve
operation.
ELECTRONIC EXPANSION VALVES
SYMPTOM POSSIBLE CAUSE REMEDY
High Superheat, Low
Suction Pressure
(superheat over
15 [-]
Moisture freezing and blocking valve ecover charge, install lter-drier, evacuate system,
recharge.
Dirt or foreign material blocking valve ecover charge, install lter-drier, evacuate system,
recharge.
Low refrigerant charge Correct the charge.
Vapor bubbles in liquid line Remove restriction in liquid line. Correct the refrigerant
charge.
Remove noncondensible gases.
Size liquid line correctly.
Undersized EEV Replace with correct valve.
Incorrectly sensing vapor line temperature Verify suction thermistor resistance is correct and
properly attached and insulated to the vapor line
Suction thermistor incorrectly calibrated. Replace suction thermistor assembly.
Vapor pressure measured incorrectly. After verifying lack of connectivity, replace the pressure
transducer or harness.
If harness has a short, replace harness
If gauge pressure measurement and the converted
voltage readings at the control are dierent replace
the control.
EEV is stuck Remove EEV from the system and purge with nitrogen,
replace lter drier, and recharge.
If EEV will not open, validate EEV wiring harness and
rotor resistance between the black wire and the
other 4 wires.
If none of the above recties the issue, replace
and ilter drier and recharge.
ICC dc circuit failed Verify 5Vdc to pressure transducer is present.
If not, replace ICC.
High superheat adjustment hange the superheat oset dip switches to lower
superheat
Diagnostics
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