Carrier 69NT40-541-001 Operation And Service page 67

CODE # TITLE
Frozen Mode
P10-1
(Pull Down) Test
Frozen Mode Maintain
P10-2
Temperature Test
Table 4–7 Controller Pre-Trip Test Codes (Continued)
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 tem-
perature. 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.
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 tem-
perature. The unit will then be required to maintain -17.7°C (0°F) tempera-
ture within +/- 0.5°C (0.9°F) of set point until a DataCORDER recording is
executed. The recorder return probe temperature running total (and its as-
sociated 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 av-
erage 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°C of set
point from test start to DataCORDER recording, the test passes. If tem-
perature is out side of the tolerance range at the DataCORDER recording,
the test fails.
DESCRIPTION
4–31 T-316