Carrier TRANSICOLD PrimeLINE 69NT40-571-001, Руководство по эксплуатации и обслуживанию, Страница: 87 / 186

4–51 T-372
AL980 Fresh Air Valve (EA) Fault
Cause:
When the system energizes the EverFRESH Air Valve (EA) solenoid and membrane pressure does
not drop 40 psi, the alarm is triggered. The alarm triggers OFF when membrane pressure transducer
(MPT) pressure drop is more than 40 psi when EA is opened.
Component
EverFRESH Air Valve (EA) Solenoid
Troubleshooting Run a P20 test to verify mechanical and electrical performance of the
solenoid.
If the electrical test fails, replace the valve.
If the mechanical test fails, check for obstructions blocking system flow.
Remove obstructions. If it still fails, replace the valve.
Component ML5 Controller
Troubleshooting Access function code Cd74 to perform an ML5 self-diagnostic test.
AL981 Water Drain Valve (WDV) Fault
Cause: When the system energizes the Water Drain Valve (WDV) and membrane pressure does not drop
40 psi, the alarm is triggered. The alarm triggers OFF when membrane pressure transducer (MPT)
pressure drop is more than 40 psi when the EverFRESH Air Valve (EA) is opened.
Component Water Drain Valve (WDV)
Troubleshooting Inspect WDV bowl and outlet piping for obstructions, clean components.
Run P20 test to verify mechanical and electrical performance of solenoid.
If the electrical test fails, replace the valve.
If the mechanical test fails, check for obstructions blocking system flow.
Remove obstructions. If it still fails, replace the valve.
Component ML5 Controller
Troubleshooting Access function code Cd74 to perform an ML5 self-diagnostic test.
AL982 CO2 Injection Failure
Cause: If unit is configured with the CO
2
injection option, this alarm is triggered when Cd71 is set to “On” to
enable CO
2
injection and CO
2
is less than the CO
2
setpoint by 0.5% and IPT < 20 PSIG.
Component CO
2
Supply
Troubleshooting Verify CO
2
supply is available and supplied at the recommended
pressure.
Component
CO
2
Injection Port Schrader Valve
Troubleshooting
If proper pressure is available at the CO
2
injection supply port, verify that
the Schrader valve is being depressed by the supply hose properly to
allow flow.
Component CO
2
Injection Solenoid
Troubleshooting Run a P20 test to evaluate the solenoid and replace if test fails.
AL983 CO2 Injection Pressure Transducer Failure
Cause: If unit is equipped with the CO
2
injection option, this alarm is triggered when Cd71 is set to “On” to
enable CO
2
injection and volts are not in the range of 0.5 to 4.95 VDC.
Component CO
2
Injection Pressure Transducer (IPT)
Troubleshooting From function code Cd74, run a controller self-diagnostic test. Evaluate
results to see if there is a controller or transducer issue. If there is a
sensor issue, or the test passes, change the transducer.