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4–43
T-359
P7-0
High Pressure
Switch Open
NOTE
This test is skipped if the sensed ambient temperature is less
than 7
C (45
F), the return air temperature is less than -17.8
C
(0
F), the water pressure switch is open or the condenser fan
switch is open.
Setup:
With the unit running, the condenser fan is turned off and a 900 second
(15 minute) timer is started. The right display shows the value of the initial sensor
configured and valid out of the discharge pressure, CPC pressure, discharge
temperature.
Pass/Fail Criteria:
The test fails immediately if:
• all three sensors are not configured or are invalid.
• the ambient temperature or return air temperature sensors are invalid at
the start of the test.
The test fails if:
• the high pressure switch if open at the start of the test.
• the high pressure switch fails to open within 15 minutes.
• a valid discharge temperature exceeds 137.78°C (280°F).
• a valid discharge pressure or valid condensing pressure exceeds 390
psig.
The test passes if the high pressure switch opens within the 15 minute time limit
and before any of the valid and configured sensors exceed their limits.
P7-1
High Pressure
Switch Closed
Requirements:
Test P7-0 must pass for this test to execute. Setup: The con-
denser fan is started and a 60 second timer is started.
Pass/Fail Criteria:
Passes the test if the high pressure switch (HPS) closes with-
in the 60 second time limit, otherwise, it fails.
P8-0
Perishable Mode
Heat Test
Setup:
If the container temperature is below 15.6
C (60
F), the set point is
changed to 15.6
C, and a 180-minute timer is started. The left display will read
“P8-0.” The control will then heat the container until 15.6
C is reached. If the con-
tainer temperature is above 15.6
C at the start of the test, then the test proceeds
immediately to test P8-1 and the left display will change to “P8-1.”
Pass/Fail Criteria:
The test fails if the 180 minute timer expires before the control
temperature reaches set point. The display will read “P8-0,” “FAIL.”
P8-1
Perishable Mode
Pulldown Test
Requirements:
Control temperature must be at least 15.6
C (60
F).
Setup:
The set point is changed to 0°C (32
F), and a 180-minute timer is started.
The left display will read “P8-1,” the right display will show the supply air tempera-
ture. The unit will then start to pull down the temperature to the 0C set point.
Pass/Fail Criteria:
The test passes if the container temperature reaches set
point before the 180 minute timer expires.
Table 4–7 Controller Pre-trip Test Codes (Continued)
CODE #
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