Rheem RA17 Series Installation Instructions Manual page 51

Service Analyzer Charts
FLOODING
SYMPTOM
Bad pressure reading
Suction thermistor in wrong location
Poor system control
Bad suction thermistor
using an EEV
Improper superheat setting less than 5
ELECTRONIC EXPANSION VALVES
SYMPTOM
Moisture freezing and blocking valve
Dirt or foreign material blocking valve
Low refrigerant charge
Vapor bubbles in liquid line
Undersized EEV
Incorrectly sensing vapor line temperature
Suction thermistor incorrectly calibrated.
High Superheat, Low
Vapor pressure measured incorrectly.
Suction Pressure
(superheat over
15 [- ]
EEV is stuck
ICC dc circuit failed
High superheat adjustment
POSSIBLE CAUSE
[-15
POSSIBLE CAUSE
DIAGNOSTICS
REMEDY
Check transducer wiring
Replace thermistor
Replace thermistor
] Adjust EEV SH setpoint dipswitches and validate valve
operation.
REMEDY
ecover charge, install lter-drier, evacuate system,
recharge.
ecover charge, install lter-drier, evacuate system,
recharge.
Correct the charge.
Remove restriction in liquid line. Correct the refrigerant
charge.
Remove noncondensible gases.
Size liquid line correctly.
Replace with correct valve.
Verify suction thermistor resistance is correct and
properly attached and insulated to the vapor line
Replace suction thermistor assembly.
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 di erent replace
the control.
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 recti es the issue, replace
and ilter drier and recharge.
Verify 5Vdc to pressure transducer is present.
If not, replace ICC.
hange the superheat o set dip switches to lower
superheat
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