Carrier TRANSICOLD PrimeLINE 69NT40-571-001, Руководство по эксплуатации и обслуживанию, Страница: 85 / 186

4–49 T-372
Component
Water Drain Valve (WDV)
Troubleshooting A closed or plugged WDV or filter housing could prevent any air from
entering the container. P20-3 tests valve operation.
Potential failure results:
• MPT pressure fails to change when the valve is energized. Check
for signs of blockage by removing the WDV housing and particu
-
late filter housings. Clean any debris. While removed, inspect the
WDV and associated piping for blockage.
• EA current not correct. Access function code Cd74 and perform a
ML5 self-check to verify the controller is functioning properly. If it
fails, replace the controller. If it passes self-check, replace the WDV.
Component EverFRESH Nitrogen Valve (EN)
Troubleshooting
An open or leaky EN valve would allow N2 to go into the sensor sensing
chamber causing an inaccurate reading. P20-5 tests this valve.
Potential failure results:
• If tests fail, remove the EN and verify the valve is not clogged or
damaged.
• EA current is not correct. Access function code Cd74 and perform
a ML5 self-check to verify the controller is functioning properly. If it
fails, replace the controller. If it passes self-check, replace the EN.
AL962 Oxygen (O2) Out of Range
Cause: This is a notification alarm and does not pose a risk to fresh produce, however the benefit of
atmosphere control will not be lost. O
2
level reaches pulldown limit and then O
2
exceeds 5% over
setpoint for 30 minutes.
Component
Upper Fresh Air Panel
Troubleshooting Verify the Upper Fresh Air Panel has not been opened.
Component
EverFRESH Air Valve (EA)
Troubleshooting An EA that is stuck open can allow continuous flow of fresh air into the
container when the compressor is on. See troubleshooting in the AL929
section.
Component
Container Air Tightness
Troubleshooting Seal container where possible (access panels, rear doors, mounting
hardware, etc).
AL976 Air Compressor Internal Protector Open
Cause:
EverFRESH Air Compressor (EAC) internal protector opens.
Component
EverFRESH Air Compressor (EAC)
Troubleshooting Follow steps defined in AL929 EAC testing.
Component ML5 Controller
Troubleshooting Access function code Cd74 to perform an ML5 self-diagnostic test.
AL929 Loss of Atmospheric Control