RTHD and RTAC - Trane

Is the EXV
functioning
properly?
Electronic Expansion Valve
the old connector and splice in a new section of cable and a new connector. See
Section 2-IPC Overview for instruction on installing a new cap.
If the EXV is bound, try to turn the LED on with a magnet. If the light will not turn
on, there could be a problem with the EXV. Try to turn the light on in Binding
View. With the light on, hold the magnet to the LED. The LED should get brighter.
If it doesn’t get brighter, this may indicate a problem with the EXV or the
connector. Take a close look at the connector to make sure that all four wires are
securely in place. It may be necessary to remove the cap to check for broken or
misplaced wires.
If there is no problem found with the connector and the EXV will not bind, then
replace the EXV.
The EXV goes to the closed position at a normal shutdown. There is a sight glass
in the body of the valve to monitor EXV position. Refer to Figure 35.
Figure 35.EXV Position
1 Shut the chiller down.
2 Lock out the circuit. This can be done using DynaView under the setpoint tab
or in TechView under the Compressor Service View. Refer to Figure 36. With
the circuit shut down the valve should go to the closed position. Note the EXV
position.
3 Using TechView under Compressor Service View, open the EXV. Look at the
EXV position. The valve should go to the open position. Refer to Figure 36.
4 The valve should go from closed to full open. If the valve does not move or
open fully, replace the valve.
It is very important to confirm that the valve is bound and communicating on
the LLID bus before it is replaced.
5 Place the valve back into the auto mode of operation.
RLC-SVD05A-EN 55