Service manual

T -318
3-- 24
Table 3-9 Controller Pre-Trip Test Codes (Sheet 4 of 4)
Code
No.
TITLE DESCRIPTION
P8-2
Perishable Mode
Maintain Tempera-
ture 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 main-
tain the 0 C temperature to within + or - 0.5 degrees C (0.9 degrees F) 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 +/- 0.5 degrees 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 248 C (120 F).
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 7 C (45 F). If the container tempera-
ture is below 7 C, a 180 minute timer will be started, the set point will be set to 7
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 -0.3 C or
6.7 F) 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 7.2 C
(45 F) 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 -17.7 C (0 F). The unit will then have a maximum
of three hours to pull the container temperature down to the -17.7 C set point.
Pass/Fail Criteria: If this occurs within the three hour time limit, the test passes.
If pulldown is not completed within the three hour time, the test fails.
P10-2
Frozen Mode Main-
tain Temperature
Test
Setup: After the unit has successfully completed frozen pulldown 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 -17.7 C (0 F) temperature within
+/- 0.5 degrees C (0.9 degrees F) of set point until a DataCORDER recording is
executed. The recorder return probe temperature running total (and its associat-
ed 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 +/- 0.5 degrees 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.