Pre-Trip Mode; Table 25. Controlled Atmosphere Pre-Trip Test Codes - Carrier 69NT40-489-100 Series Operation And Service Manual

9.2.2 Pre-Trip Mode

Failure results in a single retry prior to the fail message if initiated from "Auto Pre-Trip".
S
The total time span of an "Auto Pre-Trip" runs from 39 to 79 minutes.
S
CODE
TITLE
NO.
P0 LED/LCD Test
P1-0 Drain Valves Test
Oxygen Solenoid
P1-1
Valve Test
Nitrogen Purity
P1-2
Valve Test
P2-0 Heater Test
Oxygen Sensor
P3-0
Span Calibration

Table 25. Controlled Atmosphere Pre-Trip Test Codes

All lights and display segments will be energized for three seconds at the start
of the pre-trip. Since the system cannot recognize lights and display failures,
there are no test codes or results associated with this phase of pre-trip.
Pass/Fail Criteria: The individual performing the test will determine through
observation if test passes or fails.
Requirements: The pressure sensor must read at least 50 psig prior to this
test.
Setup: This test will continue with the drain valves closed for 10 seconds, and
then run with the drain valves open for 10 seconds. A timer will be displayed
during the test.
Pass/Fail Criteria: Passes for a detected initial pressure greater than 50 psig
and pressure drop of greater than 15 psig, after the drain valves open. Fails
otherwise.
Requirements: The pressure sensor must read at least 50 psig prior to this
test.
Setup: This test will continue with the drain and oxygen solenoid valve (OSV)
closed for 10 seconds, and then run with OSV open for 10 seconds. A timer will
be displayed during the test.
Pass/Fail Criteria: Passes for a detected initial pressure greater than 50 psig
and pressure drop greater than 20 psig after the oxygen valve opens. Fails
otherwise.
Requirements: The pressure sensor must read at least 50 psig prior to this
test.
Setup: This test will continue with the drain and nitrogen purity valve (NPV)
closed for 10 seconds, and then run with NPV open for 10 seconds. A timer will
be displayed during the test.
Pass/Fail Criteria: Passes for a detected initial pressure greater than 50 psig
and pressure drop of greater than 10 PSIG, from the 50 psig minimum starting
pressure, after the Nitrogen Purity Valve opens. Fails otherwise.
Requirements: The pressure sensor must read at least 50 psig throughout this
test.
Setup: This test will energize the air heater for up to 30 minutes. The test will
end when the temperature comes to and stays within 3_C of the setpoint for 5
minutes. At that point, the controller will open the Nitrogen Purity Valve (NPV)
and display the membrane pressure for one minute.
Pass/Fail Criteria: Passes for maintaining temperature within 3_C for 5
minutes and then pressure for 1 minute. Fails otherwise.
This test will attempt a span calibration of the oxygen sensor using ambient
atmospheric air, and will run for up to ten minutes.
Pass/Fail Criteria: Passes for a successful calibration. Fails otherwise.
NOTES
DESCRIPTION
109 T-305