How To Test; Close Valve Test; Open Valve Test; Exit Test Mode - Trane ACONT900AC43UA Service Manual

Electronic Expansion Valve (EEV) Test

How to test

Close valve and open valve tests are active in any mode
of operation
Test Pins: Open, close, test (Figure 2)

Close valve test

1. Touch CLOSE pin to TEST pin (Figure 4).
Figure 4
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 drop-
ping.
• 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.
HP - C 4

Open valve test

1. Touch OPEN pin to TEST pin (Figure 5).
Figure 5
EEV drives open (5 seconds 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 jumping to the opposite mode Test pin.
The system will return to normal super heat control.
Test mode will cancel if:
1.) Unit enters Defrost.
2.) Stage-Delay occurs.
3.) Y1 or Y2 input(s) are lost.