Carrier 69NT40-489-100 Series - Page 140

116T-305
11.2 CONTROLLED ATMOSPHERE (CA) SYSTEM MALFUNCTION -- CONTINUED
Pressure transducer reading
(Low)
Air compressor defective or leaking Check
Compressor pressure regulating or relief valve leak Check
CA system leak Check
Dirty air intake filter element Check
Oxygen solenoid valve (OSV) defective Check
Membrane filter elements dirty Check
Filter drain solenoid valves leaking Check
Pressure transducer reading
(High)
Heater defective Check
Nitrogen membrane separator defective Check
CA piping clogged or kinked Check
Inconsistent gas % reading
Incorrect calibration values Calibrate
Cal gas calibration error Calibrate
Fresh air makeup is open Close
Leaky container box Check
Leaky air solenoid valve (ASV) Check
CO
2
level not in range
CO
2
bottle empty Check
CO
2
pressure regulator closed or frozen Check
Control solenoid valve defective (CSV) Check
CO
2
sensor calibration error Check
Leaky container box Check
CO
2
line leak, clogged or kinked Check
Gas sensors will not calibrate
CO
2
Cal gas (5%, 20%, OFF) Correct mixture is not se-
lected.
Check
Controlled Atmosphere system leak Check