3-22
T-268-07
CODE
#
DESCRIPTION
TITLE
NOTE
Starting with test P7-0 through test P10, these tests are only included with the “Auto2” (Optional) selection
menu. (Refer to section 3.2.1.)
Setup:
When the unit is running, the condenser fan is de-energized, and a 15
minute timer is started. The right display shows discharge pressure if equipped
with the discharge pressure transducer (DPT), or condenser pressure if
equipped with a condenser pressure transducer (CPT), or discharge pressure if
equipped with either a discharge pressure transducer (DPT) or a condenser
pressure transducer (CPT).
Pass/Fail Criteria:
The test fails if high pressure switch fails to open in 900
seconds.
Note, this test is skipped if the unit does NOT have:
S
A compressor discharge sensor (CPDS).
S
A discharge pressure transducer (DPT).
S
Condenser pressure transducer (CPT).
P7 0 High Pressure
In addition, this test is skipped if:
S
The sensed ambient temperature is less than 7
_
C (45
_
F).
S
The return air temperature is less than --17.8
_
C (0
_
F).
S
The water pressure switch (WP) is open, indicating that the unit is
operating with a water-cooled condenser.
P7-0 High Pressure
Switch Closed
Pass/Fail Criteria:
Under conditions of the above Note, the test immediately
fails if the following inputs are sensed to be invalid:
S
Compressor discharge sensor (CPDS).
S
Discharge pressure transducer (DPT).
S
Condenser pressure transducer (CPT).
OR
if any one of the following inputs are sensed to be invalid:
S
Return temperature sensor (RTS).
S
Ambient sensor (AMBS).
In addition, the test will fail if:
S
The high pressure switch (HPS) fails to open within 15 minutes.
S
The discharge temperature exceeds 138
_
C (280
_
F).
S
The discharge temperature is less than or equal to ambient temperature
plus 5
_
C (9
_
F).
S
The condenser pressure transducer (CPT) or discharge pressure
transducer (DPT) pressure exceeds 27.42 kg/cm
2
(390 psig).
P7-1 High Pressure
Switch Open
Requirements:
Test P7-0 must pass for this test to execute. Setup: The
condenser fan is started and a 60 second timer is started.
Pass/Fail Criteria:
Passes the test if the high pressure switch (HPS) closes
within the 60 second time limit, otherwise, it fails.
P8-0 Perishable Mode
Heat Test
Setup:
If the container temperature is below 60
_
F, the set point is changed to
60
_
F, and a 60 minute timer is started. The left display will read “P8-0.” The
control will then heat the container until 60
_
F is reached. If the container
temperature is above 60
_
F 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.”
