Table 3-7 Controller Pre-Trip Test Codes - Carrier 69NT40--541--200 TO 299 Operation And Service

P5-1 Supply Probe Test
P5-2 Return Probe Test
P-6
P6-0 Compressor On
P6--H & P6L
Suction Modulation
P6-2 Valve (Open and
Closed)
P6-3 Quench Valve Test
P6-4 Not Applicable
P6-5 Not Applicable
P7-0 & P8 are included with the "Auto2 & Auto 3" only. P9-0 through P10 are included with "Auto2" only
High Pressure
P7--0
Switch Closed
T-317
Table 3-7 Controller Pre-Trip Test Codes (Sheet 2 of 4)
Requirements: For units equipped with secondary supply probe only.
Pass/Fail Criteria: The temperature difference between primary and secondary
probe (supply) is compared.
If this test fails, "P5-1" and FAIL will be displayed. If both Probe tests (this
and the SUPPLY/ RETURN TEST) pass, because of the multiple tests, the
display will read 'P 5' 'PASS'.
Requirements: For units equipped with secondary return probe only.
Pass/Fail Criteria: The temperature difference between primary and secondary
probe (return) is compared.
1. If this test fails, "P5-2" and "FAIL" will be displayed. If both Probe tests
(this test and the SUPPLY/ RETURN) pass, because of the multiple
tests, the display will read "P 5," "PASS."
2.
The results of Pre-Trip tests 5-0, 5-1 and 5-2 will be used to activate or
clear control probe alarms.
Not Applicable
Setup: A current draw test is performed before the compressor is started. The
compressor is started. SMV is opened and another current draw test is per-
formed.
Pass/Fail Criteria: Passes if the change in compressor current draw is within the
specified range.
Not Applicable
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
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.
Not Used
Not Used
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 min-
utes.
NOTE
NOTES
NOTE
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