Carrier 69NT40-561-399 Operation And Service Manual page 91

CODE TITLE
P5-10 Humidity
Controller Configu-
ration Verification
Test
P5-11 Humidity
Installation
cation Test
P5-12 Humidity
Range Check Test
P6 Tests - Refrigerant Probes, Compressor and Refrigerant Valves: Pass/Fail testing is performed for the
compressor, EEV, DUV, ESV, and the refrigerant pressure and temperature sensors.
CODE TITLE
P6-0 Discharge Therm-
istor Test
P6-1 Suction
tor Test
P6-2 Discharge
sure Transducer
Test
P6-3 Suction
Transducer Test
P6-4 Compressor
rent Draw Test
P6-5 Compressor Leak
Test
P6-6 through P6-10 are conducted by changing status of each valve and comparing suction
pressure change and/or compressor current change with predetermined values. Tests will
cause compressor and condenser fans to cycle on and off as needed to generate the pressure
required for individual Pre-trip sub tests. The compressor will start in order to build discharge
pressure, followed by compressor pump down sequence. At the conclusion of compressor
pump down sequence, the compressor will shut down and the valve test will start.
P6-6 Economizer Valve
Test
DESCRIPTION
Sensor This is a Pass/Fail/Skip test of the humidity sensor configuration.
Test passes if the controller configuration has humidity sensor in.
Test fails if the controller configuration has humidity sensor out and Vout is
greater than 0.20 Volts for the humidity sensor.
Test is skipped if the controller configuration has the humidity sensor out and
Vout is less than 0.20 Volts.
Test P5-9 must pass before this test is run.
Sensor This is a Pass/Fail test of humidity sensor installation (sensor is present).
Verifi-
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.
Sensor 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.
DESCRIPTION
If Alarm 64 is active the test fails. Otherwise, the test passes.
Thermis- If the Suction Temperature Sensor (CPSS) both is configured ON and is in-
valid, the test fails. Otherwise the test passes.
Pres- If Alarm 65 is active any time during the first 45 second period, the test fails.
Otherwise, the test passes.
Pressure If Alarm 66 is active the test fails. Otherwise the test passes.
Cur- Compressor current is tested before and 10 seconds after start up. If current
does not increase, the test fails. P6-7 is run at the end of P6-4. If this test fails,
P6-6 is skipped.
Pre-trip P6-5 ensures that the compressor holds pressure. After compressor
pump up and pump down, the compressor is turned off for 62 seconds. When
suction side pressure holds (less than 8 psi rise) for 10 seconds, P6-5 pass-
es, otherwise the Compressor Leak Test fails.
Passes if suction pressure increases a minimum of 4 psia when the valve
opens for 15 seconds.
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