Carrier EverFRESH Operation, Service And Parts Manual page 31

Condition
Membrane Pressure
Transducer (MPT) Reading
High
EverFRESH Air Compressor
(EAC) Runs But O2 Does
Not Come Down
EverFRESH Air Compressor
(EAC) Runs But O2 Does
Not Come Up
EverFRESH Air Compressor
(EAC) Runs But CO2 Does
Not Come Down
CO2 Does Not Come Up
In CO2 Injection Mode And
Not Maintaining Setpoint
CO2 Injection Pressure
Transducer (IPT)
Reading In Range
Table 4–2 Troubleshooting System Conditions
Possible Causes
Water separator or air filters clogged
EverFRESH piping blocked
Nitrogen membrane defective
Fresh air vent open
Leak in piping
Sensor defective
Nitrogen membrane defective
Container box not sealed
Leaky cylinder head
EverFRESH Air Valve (EA) does not
open
Water separator not draining
Particulate filters not draining
Nitrogen membrane defective
Leaky container box
Produce not capable of raising CO2
Low CO2 bottle pressure
Leaky container box
CO2 Injection Solenoid failure
Restricted CO2 input to the system
Not
Recommended Actions
Remove housings and clean debris, verify
WDV opening.
Inspect plumbing, hoses, fittings, check
valve, and orifices for signs of blockage.
Repair as required.
Operating the system for a period of time
can "dry out" the membrane and increase
efficiency. Run a Pre-trip "AUTO CA" test to
check membrane efficiency. Allow the
system to operate for one hour and check
nitrogen levels. If nitrogen percentage is
increasing, continue to dry out. If not,
replace the membrane.
Check vent, close.
Check system for leaks.
Check sensor alarms. Replace as needed.
Run P20
concentration.
Perform pressure decay test.
Perform minor rebuild.
Check F3 fuse.
Run a P20 PTI test. P20-2 will check for
proper valve operation: electrical and
mechanical.
Clean inspect water separator housing.
Inspect / replace particulate filters.
PTI check. Refer to
Inspect container, verify fresh air vents
closed, if possible check curtain install.
Some produce does not generate much
CO2 and needs to be pre-charged with gas.
If charge leaks out can only be replaced by
recharging.
Check bottle pressure gauge to ensure
bottle delivering 50 PSIG.
Verify hose from tank to CO2 injection input
is depressing the Schrader valve on the
inlet.
Inspect condition of the box. Verify the fresh
air panel is closed. If possible, check
condition of the curtain.
Run a P20 test and check P20-6 results.
Replace if necessary.
Remove CO2 source and run a P20 test.
Validate the results of P20-7. If it fails,
replace the sensor.
4–7
test to validate nitrogen
Section 3.4
T-374