T-340
4–52
P10 Tests - Frozen Mode Tests:
P10-0
Frozen Mode Heat Test
If the container temperature is below 7.2°C, the setpoint is changed to
7.2°C, 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
7.2°C. at the start of the test, then the test proceeds immediately to test 10-
1. During this test, the control temperature will be shown on the right dis
-
play.
The test fails if the 180 Minute timer expires before the control temperature
reaches setpoint - 0.3°C. If the test fails, it will not auto-repeat. There is no
pass display for this test. Once the control temperature reaches setpoint,
the test proceeds to test 10-1.
P10-1
Frozen Mode Pulldown
Test
Control temperature must be at least 7.2°C (45°F)
The setpoint is changed to -17.8°C. The system will then attempt to pull
down the control temperature to setpoint using normal frozen mode cool
-
ing. During this test, the control temperature will be shown on the right dis
-
play.
The test passes if the control temperature reaches setpoint minus 0.3°C
before the 180 minute timer expires. Otherwise, the test fails. Upon failure
and when initiated by an automatic Pre-trip sequence, P10-1 will auto-re
-
peat once by starting P10-0 over again.
P10-2
Frozen Mode Maintain
Temperature Test
Test P10-1 must pass for this test to execute.
Same as for test 8-2 except the control temperature is the return probe
temperature.
The average error must be +/-1.6°C. If the DataCORDER supply tempera
-
ture probe is invalid, the test fails and the control probe temperature will be
recorded as -50°C. Upon failure and when initiated by an automatic Pre-
trip sequence, P10-2 will auto-repeat by starting P10-0 over again.
Table 4–7 Controller Pre-trip Test Codes