4–29
T-354
P6-2
Suction Modulation
Valve (Open and
Closed)
Setup:
The compressor and fans continue to run from the previous test. The
quench valve (if configured) will operate as in normal control mode. The SMV
is closed to 0% open, current and condenser pressure readings are taken. The
SMV is opened to 50% with continuous current and condenser pressure read-
ings taken to establish maximum values. The SMV is returned to 0% open and
final readings are taken.
Pass/Fail Criteria:
Passes if the calculated difference in current at the 50%
open position are above a specified value before and after opening of the SMV,
OR the calculated difference in condenser pressure at the 50% open position
are above a specified value before and after opening of the SMV
P6-3
Quench Valve Test
Setup:
The compressor suction temperature is measured with the Quench
valve closed. The Quench valve is energized and the suction temperature drop
is checked.
Pass/Fail Criteria:
Passes if suction temperature is within the valid range.
P6-4
Not Applicable
Not Used
P6-5
Not Applicable
Not Used
NOTE
P7-0 & P8 are included with the "Auto2 & Auto 3" only. P9-0 through P10 are included with "Auto2" only
P7-0
High Pressure
Switch Closed
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 the unit is
equipped with a discharge pressure transducer (DPT). If no DPT is installed,
the condenser pressure transducer (CPT) reading will be displayed.
Pass/Fail Criteria:
The test fails if high pressure switch fails to open in 15 minutes.
NOTE
This test is skipped if the unit does NOT have:
1. A compressor discharge sensor (CPDS).
2. A discharge pressure transducer (DPT).
3. Condenser pressure transducer (CPT).
In addition, 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 (WP) is open, indicating that the unit is oper-
ating with a water-cooled condenser.
Pass/Fail Criteria:
Under conditions of the above NOTE; the test immediately
fails if the following inputs are sensed to be invalid:
• Compressor discharge sensor (CPDS).
• Discharge pressure transducer (DPT).
• Condenser pressure transducer (CPT).
•
OR,
if any one of the following inputs are sensed to be invalid:
• Return temperature sensor (RTS).
• Ambient sensor (AMBS).
In addition, the test will fail if:
• The high pressure switch (HPS) fails to open within 15 minutes.
• The discharge temperature exceeds 138
C (280
F).
• The discharge temperature is less than or equal to ambient temperature
plus 5
C (9
F).
• The condenser pressure transducer (CPT) or discharge pressure trans-
ducer (DPT) pressure exceeds 27.42kg/cm
2
(390psig).
Table 4–7 Controller Pre-Trip Test Codes (Continued)
CODE
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