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T-318
3
−
38
Table 3-7 Controller Pre-Trip Test Codes (Sheet 3 of 6)
P5-11
Humidity Sensor
Installation
Verification Test
This is a Pass/Fail test of humidity sensor installation (sensor is present).
Test passes if Vout is greater than 0.20 Volts for the humidity sensor.
Test fails if Vout is less than 0.20 Volts for the humidity sensor.
Test P5
−
10 must pass before this test is run.
P5-12 Humidity Sensor
Range Check Test
This is a Pass/Fail test of the Humidity Sensor Range.
Test passes if Vout for the humidity sensor is between 0.33 Volts and 4 Volts.
Test fails if Vout is outside of this range.
Test P5
−
11 must pass before this test is run.
P6 Tests - Compressor and Refrigerant Valves:
This section of testing deals with the Compressor and the two
Compressor valves: Suction Modulation Valve and Quench Valve.
P6-0
Compressor On
A current draw test is performed before the compressor is started. The compres-
sor is started, the SMV is opened, and another current draw test is performed.
Test Passes if the change in compressor current draw is within the specified range.
P6-1,
P6-H,
P6L
Not Applicable
These tests are not run for Single Speed Compressors
P6-2
Suction Modulation
Valve (Open and
Closed)
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 readings taken
to establish maximum values. The SMV is returned to 0% open and final read-
ings are taken.
Test 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
To run this test, the system must be equipped with a solenoid quench valve as
determined by CnF12, (TXV/Solenoid Quench Valve), and ambient temperature
must be greater than
−
12
°
C.
Compressor suction temperature is measured with the Quench valve closed, the
Quench valve is energized and the suction temperature drop is checked.
Test passes if suction temperature is within the valid range.
P6-4
Not Applicable
This test is not run for units configured with a stepper type SMV.
P6-5
Not Applicable
This test is not run, units with stepper type SMVs are not configured with a by-
pass valve.
P6-6
Not Applicable
This test is only run on systems that have an Unloader as indicated by CnF13
(Unloader).
NOTE
P7-0 & P8 are included with the “Auto2 & Auto 3” only. P9-0 through P10 are included with “Auto2” only.