Carrier 69NT40-511-199 - Manual (Page 61)

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P8-1 Perishable Mode
Pull Down Test
Requirements: Control temperature must be at least 60_F.
Setup: The set point is changed to 32_F, and a 180 minute timer is started. The
left display will read “P8-1,” the right display will show the supply air temperature.
The unit will then start to pull down the container temperature to the 32_F set
point.
Pass/Fail Criteria: The test passes if the container temperature reaches set
point before the 180 minute timer expires.
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 temperature to within + or -- 0.5_C (0.9_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_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 DataCORDER recording, the
test fails.
P9-0 Defrost Test
Setup: The defrost temperature sensor (DTS) temperature 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 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 hours, or until the DTS senses the temperature
above 25.6_C.
Pass/Fail Criteria: The test passes if DTS is sensed above 25.6_C before a two
hour timer times out. The test fails if DTS does not go below 10_C after 30
minutes of full cooling, and/or the heater termination thermostat (HTT) is open
when the DTS is below 10_C. The test also fails if the HTT opens anytime during
the defrost cycle and/or 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 temperature is raised 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 one hour.
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.”