Operating instructions

TM 11574A-OI
2-38
Table 2-8 Controller Pre-Trip Test Codes - Continued
Code
No.
TITLE DESCRIPTION
P8-2
Perishable Mode
Maintain
Temperature Test
Requirements: Test P8-1 must pass for this test to execute.
Setup: The left display will read “P8-2,” and the right display will show the
supply air temperature. A 60 minute timer is started. The unit will be required to
maintain the 32 F (0 C) temperature to within +/- 0.9 F (+/- -0.5 C) of set point
until a DataCORDER recording is executed. The recorder supply probe
temperature running total (and its associated readings counter) will be zeroed
out for the remainder of the recording period at the start of this test, so that the
actual value recorded in the DataCORDER will be an average of only this test’s
results. Once a recording interval is complete, the average recorder supply
temperature will be recorded in the DataCORDER, as well as stored in memory
for use in applying the test pass/fail criteria.
Pass/Fail Criteria: If the recorded temperature is within +/-0.9 F (+/-0.5 C) of
set point from test start to DataCORDER recording, the test passes. If the
average temperature is outside of the tolerance range at the recording, the test
fails.
P9-0 Defrost Test
Setup: The defrost temperature sensor (DTS) reading will be displayed on the
left display. The right display will show the supply air temperature. The unit will
run FULL COOL for 30 minutes maximum until the DTT is considered closed.
Once the DTT is considered closed, the unit simulates defrost by running the
heaters for up to two hours, or until the DTT is considered open.
Pass/Fail Criteria: The test fails if: the DTT is not considered closed after the
30 minutes of full cooling, HTT opens when DTT is considered closed or if return
air temperature rises above 120 F (48 C).
P10-
0
Frozen Mode Setup
Test
Setup: After completion of the defrost test, the testing proceeds directly to test
P10-1 if the container temperature is above 45 F (7.2 C). If the container
temperature is below 45 F (7.2 C), a 180 minute timer will be started, the set
point will be set to 45 F (7.2 C) and the control will be placed in normal heat.
The left display will read “P10-0” and the unit will continue in operation until the
temperature is raised to set point. Pass/Fail Criteria: If the temperature does
not reach set point less 6.7 F (-0.3 C) before the timer times out display will read
“P100,” “FAIL.” The test will not auto-repeat.
P10-
1
Frozen Mode (Pull
Down) Test
Setup: When the container temperature is greater than or equal to the 45 F (7.2
C) set point which was set in the frozen mode heat test, the left display will read
“P10-1” and the right display will show the return air temperature. The set point
will then be changed to 0 F (-17.7 C). The unit will then have a maximum of
three hours to pull the container temperature down to the 0 F (-17.7 C) set point.
Pass/Fail Criteria: If this occurs within the three hour time limit, the test passes.
If pull down is not completed within the three hour time, the test fails.
P10-
2
Frozen Mode
Maintain
Temperature Test
Setup: After the unit has successfully completed frozen pull down test, the left
display will read “P10-2” and the right display will show return air temperature.
The unit will then be required to maintain 0 F (-17.7 C) temperature within =+/-
0.9 F (+/-0.5 C) of set point until a DataCORDER recording is executed. The
recorder return probe temperature running total (and its associated counter) will
be zeroed for the remainder of the recording period at the start of this test, so
that the actual recorded value will be an average of only this test’s results. Once
the recording interval is complete, the average return temperature will be
recorded in the DataCORDER, and stored in memory for use in applying the test
pass/fail criteria.
Pass/Fail Criteria: If the recorded temperature is within +/- 0.9 F (+/-0.5 C) of
set point from test start to DataCORDER recording, the test passes. If
temperature is outside of the tolerance range at the DataCORDER recording,
the test fails.