TAM823
Electronic Expansion Valve Test Option 1
Access the Unit Test option through Display Assembly under the Control Menu.
Electronic Expansion Valve Test Option 2
Note: Close Valve and Open Valve Tests are active in any mode of operation
Test Pins: OPEN, CLOSE, TEST (See J4 on EVC Board)
Close Valve Test - Touch CLOSE pin to TEST pin.
EEV drives closed (5 seconds max) and stays closed for 1.5 minutes (90 seconds).
1) Status LED will be flashing.
2) Gauges should indicate suction pressure dropping.
• Valve is working.
• LPCO may trip.
Note: The Close Valve Test will exit after 1.5 minutes (90 seconds) and will not reinitiate (requires a break and make to
initialize). To clear faults stored in memory, apply a jumper between Close and Test pins for 10 seconds.
Open Valve Test - Touch OPEN pin to TEST pin.
EEV drives open (5 sec max) and stays open for 30 seconds.
1) Status LED will be flashing.
2) Temperature probe should indicate superheat falling.
• Valve is working.
Note: If jumper is left on pins, the OPEN VALVE TEST will be cleared after 30 seconds and will not reinitiate (requires a
break and make to reinitialize).
Exit Test Mode - The Open Valve Test or Closed Valve Test can be cancelled by momentarily jumping to the opposite
mode Test pin. The system will return to normal super heat control.
EEV TEST PROCEDURES
Evaporator
Temperature
Sensor (ET)
Gas
Temperature
Sensor (GT)
Note: Some future
models may not
have external check
valve.
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