3-23
T-292
Table 3-7 Controller Pre-Trip Test Codes (Sheet 4 of 4)
P10-0
Frozen Mode
Heat Test
S
etup:
If the container temperature is below 7.2
_
C (45
_
F), the set point 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 in the right display.
Pass/Fail Criteria:
The test fails if the 180 minute timer expires before the con-
trol temperate reaches set point --0.3
_
C (0.17
_
F). If the test fails it will not auto--
repeat. 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 7.2
_
C (45
_
F)
Setup:
The set point is changed to --17.8
_
C (0
_
F). The system will then attempt
to pull don the Control temperature to set point using normal frozen mode cool-
ing. 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 --0.3
_
C
(0.17
_
F) 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 available.
Setup:
During this test, the left display will read “P10-2,” and the right display will
show the supply air temperature. A two hour timer is started. The unit will be
required to maintain the temperature to 0.5
_
C (0.9
_
F)/--1.3
_
C (2.3
_
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 tem-
perature 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 0.5
_
C (0.9
_
F)/--1.3
_
C
(2.3
_
F) of set point from test start to DataCORDER recording, the test passes. If
the average temperature is outside of the tolerance range at the recording, the
test fails and will auto--repeat by starting P10--0 over.
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