1-30
P6-2 --- Suction Modulation Valve (Open) Test
Setup: The Suction modulation valve is opened to
100 % unless restricted by current limit function, and the
unit is run for two minutes.
Pass/Fail Criteria: The supply and return probe
temperature reading difference is compared to a prede-
termined value.
P6-3 --- Future Expansion
This test is for future expansion.
P6-4 --- Suction Modulation Valve (Closed) Test
Setup: The SMV is cycled between 70% to 0% five
(5) times and then the unit is run for 5 minutes with the
SMV open at 20%.
Pass/Fail Criteria: The supply and return probe
temperature reading difference is compared to a prede-
termined value.
P6-5 --- Suction Solenoid Valve Test (69NT40)
Requirements: The unit must be equipped with a
(SSV). Current limiting may close SSV. If this happens,
the test will automatically pass.
Setup: The (SSV) is opened, the SMV is closed, and
the unit is run for one minute.
Pass/Fail Criteria: The supply and return probe
temperature reading difference is compared to a prede-
termined value
P6-6, P6-7 & P6-8 --- Future Expansion
These tests are for future expansion.
P7-0 --- High Pressure Switch (Open) Test
Setup: When the unit is running, the condenser fan is
de-energized, and a 15 minute timer is started. The right
display shows discharge temperature.
Pass/Fail Criteria: The high pressure switch fails to
open in 900 seconds.
NOTE
This test is skipped if the unit does NOT have:
D
A compressor discharge sensor (CPDS).
D
A discharge pressure sensor (DPT).
D
A condenser pressure transducer (CPT).
In addition, this test is skipped if:
D
The sensed ambient temperature is less
than 7
_
C (45
_
F).
D
If the return air temperature is less
than ---17.8
_
C (0
_
F).
D
If the water pressure switch (WPS) is open
indicating that the unit is operating with a
water-cooled condenser.
Pass/Fail Criteria: Under conditions of the above
note; the test immediately fails if any of the following
inputs are sensed to be invalid:
D
Compressor discharge sensor (CPDS).
D
Discharge pressure sensor (DPT).
D
Condenser pressure transducer (CPT).
D
Return temperature sensor (RTS).
D
Ambient sensor (AMBS).
Otherwise, the test fails if:
D
High pressure switch (HPS) fails to open within
15 minutes.
D
Discharge temperature exceeds 138
_
C (280
_
F).
D
Discharge temperature is less than or equal to
ambient temperature plus 5
_
C (41
_
F).
D
Condenser pressure transducer (CPT) or
discharge pressure sensor (DPT) pressure
exceeds 27.42 kg/cm
2
(390 psig).
P7-1 --- High Pressure Switch (Close) Test
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: If the high pressure switch closes
within the 60 second time limit.
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, also 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 60 minute timer
expires before the control temperature reaches set point
and the display will read “P8---0” “FAIL”.
P8-1 --- Perishable Mode (Pull Down) Test
Requirements: Control temperature must be at least
60
_
F.
Setup: The set point is changed to 32
_
F, and a 180
minute timer is started, also the left display will read
”P8---1”, the right display will show the supply air
temperature. The unit will then start to pull down the
container temperature to the 32
_
F set point.
Pass/Fail Criteria: The test passes if the container
temperature reaches set point before the 180 minute
timer expires.
P8-2 --- Perishable Mode (Maintain Temperature) Test
Requirements: Test P8-1 must pass for this test to
execute.
Setup: The left display will read “P8---2”, and the
right display will show the supply air temperature. A 60
minute timer is started, and the unit will be required to
maintain the 32
_
F temperature to or --- 0.5
_
C
(0.9
_
F) of set point until a DataCorder recording is
executed. The recorder supply probe temperature run-
ning total (and it’s reading’s 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 occurs, the average recorder supply
temperature 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 temperature remains within
+ or --- 0.5
_
C. of set point from test start to DataCorder
Downloaded from
