1-31
recording, the test passes. If temperature is outside of the
tolerance range at the DataCorder recording, the test
fails.
P9-0 --- Defrost Test
Setup: The DTS temperature will show on the right
display, and the right display will show the supply air
temperature. The unit will run full cool for 30 minutes
maximum while the DTS sensor temperature is above
10
_
C. Once the DTS is below 10
_
C, the unit simulates
defrost by running the heaters for up to two (2) hours, or
until the DTS senses temperature above 25.6
_
C.
Pass/Fail Criteria: The test fails if: The DTS does not
go below 10
_
C after 30 minutes of full cooling, and also if
the HTT is open when the DTS is below 10
_
C. The test
also fails if the HTT opens anytime during the defrost
cycle and also if the return air temperature exceeds
120
_
F anytime during the heat cycle.
P10-0 --- Frozen Mode (Setup) Test
Setup: After completion of the DTS test, the set
point will be set to 7
_
C (45
_
F). The left display will read
“P100”, and if the container temperature is below 45
_
F,
will continue this display until the container is heated up
to set point. The left display will change to “P101” and
execute the frozen pull down test when the container
temperature reaches set point, or if the container
temperature initially was greater than or equal to set
point. The maximum time allowed in heat mode is TBD.
Pass/Fail Criteria: If this time limit is exceeded, the
test fails. There will be no pass indication for this test.
However, if the test fails the display will read “P100”
“FAIL”.
P10-1 --- Frozen Mode (Pull Down) Test
Setup: When the container temperature is greater
than or equal to the 45
_
F. set point which was set in the
frozen mode heat test, the left display will read “P101”,
the right display will show the return air temperature, and
the set point will then be changed to ---17.7
_
C (0
_
F). The
unit will then have a maximum of 3 hours to pull the
container temperature down to the 0
_
F set point.
Pass/Fail Criteria: If this occurs within the 3 hour
time limit, the test passes. If pull down is not completed
within the 3 hour time limit, the test fails.
P10-2 --- Frozen Mode (Maintain Temperature) Test
Setup: After the unit has successfully completed the
frozen pull down test, the left display will read “P102”,
and the right display will show the return air temperature.
The unit will then be required to maintain the 0
_
F
temperature or --- 0.5
_
C (0.9
_
F) of set point
until a DataCorder recording is executed. The recorder
return probe temperature running total (and it’s read-
ing’s 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 occurs, the
average recorder return 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 temperature remains within
+ or --- 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.
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