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T-334
Table 3--7 Temperature Controller Pre-Trip Test Codes (Sheet 4 of 4)
P8-2
Perishable Mode
Maintain Tempera-
ture Test
Requirements:
Test P8-1 must pass for this test to execute.
This test is
skipped if the DataCORDER is not configured or not available
.
Setup:
A 15 minute timer is started. The unit will be required to minimize control
temperature error (supply temperature minus set point) until the timer expires.
The control temperature will be sampled at least once each minute starting at the
beginning of P8-2.
Pass/Fail Criteria:
If the average recorded temperature is /- 1.0C (1.8F)
of set point, the test passes. If the average temperature is outside of the toler-
ance range or if the DataCORDER supply temperature probe is invalid, the test
fails and and the control probe temperature will be recorded as -50.0C. P8-2 will
auto-repeat by starting P8-0 over.
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 49/50C (120/122F).
P10-0 Frozen Mode
Heat Test
S
etup:
If the container temperature is below 7.2C (45F), the set point is changed
to 7.2C and a 180 minute timer is started. The control will then be placed in the
equivalent of normal heating. If the container temperature is above 7.2C at the
start of the test, then the test proceeds immediately to test 10-1. During this test,
the control temperature will be shown in the right display.
Pass/Fail Criteria:
The test fails if the 180 minute timer expires before the con-
trol temperate reaches set point -0.3C (0.17F). If the test fails it will not auto-re-
peat. There is no pass display for this test, once the control temperature reaches
set point, the test proceeds to test 10-1
P10-1 Frozen Mode Pull-
down Test
Requirements:
Control temperature must be at least 7.2C (45F)
Setup:
The set point is changed to -17.8C (0F). The system will then attempt to
pull down the control temperature to set point using normal frozen mode cooling.
During this test, the control temperate will be shown on the right display.
Pass/Fail Criteria:
If the control temperature does not reach set point -0.3C
(0.17F) before the 180 minute timer expires the test fails and will auto-repeat by
starting P10-0 over.
P10-2
Frozen Mode
Maintain
Temperature Test
Requirements:
Test P10-1 must pass for this test to execute.
This test is
skipped if the DataCORDER is not configured or not available
.
Setup:
A 15 minute timer is started. The unit will be required to minimize return
probe temperature error (supply temperature minus set point) until the timer ex-
pires. The return probe temperature will be sampled at least once each minute
starting at the beginning of P10-2.
Pass/Fail Criteria:
If the average recorded temperature is /- 1.6C
(+/- 2.9) of set point, the test passes. If the average temperature is outside of the
tolerance range or if the DataCORDER return temperature probe is invalid, the
test fails and the control probe temperature will be recorded as -50.0C. P10-2
will auto-repeat by starting P10-0 over.
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