Carrier 69NT40-561-201, Operation & Service Manual, Page: 65 / 117

3 − 36 T-364
Table 3 − 7 Controller Pre-trip Test Codes (Sheet 3 of 6)
P5-7
Primary .vs Sec-
ondary Evaporator
Temperature
Sensor Test
This is a Pass/Fail test of the primary evaporator temperature sensor (ETS1) and
secondary evaporator temperature sensor (ETS2).
Test passes if secondary evaporator temperature sensor (ETS2) is /- 0.5
C
of the primary evaporator temperature sensor (ETS1).
P5-8
Primary Evaporator
Pressure Trans-
ducer Test
This is a Pass/Fail test of the Primary Evaporator Pressure Transducer.
Test passes if suction pressure transducer (SPT) is /- 0 psi of saturation
pressure at current evaporator temperature. Also passes if SPT is /- 1 psi of
discharge pressure 6 hours after a power interruption.
Test P5-7 must pass before this test is run.
P5-9
Suction (Evaporat-
or) Pressure Trans-
ducer Test
Units equipped with a secondary Evaporator pressure transducer.
Test passes if suction pressure transducer (SPT) is /- 1.5 psi of the evapor-
ator pressure transducer (EPT).
Test P5-8 must pass before this test is run.
P5-10
Humidity Sensor
Controller Configur-
ation Verification
Test
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 great-
er 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.
P5-11
Humidity Sensor
Installation Verifica-
tion 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 - Refrigerant Probes, Compressor and Refrigerant Valves: Pass/Fail testing is performed for the
compressor, EEV, DUV, LIV (if equipped), ESV, and the refrigerant pressure and temperature sensors.
P6-0
Discharge
Thermistor Test
If Alarm 64 is active the test fails. Otherwise, the test passes.
P6-1
Suction
Thermistor Test
If the Suction Temperature Sensor (CPSS) both is configured ON and is invalid,
the test fails. Otherwise the test passes.
P6-2
Discharge Pressure
Transducer Test
If Alarm 65 is active any time during the first 45 second period, the test fails.
Otherwise, the test passes.
P6-3
Suction Pressure
Transducer Test
If Alarm 66 is active the test fails. Otherwise the test passes.
P6-4
Compressor Cur-
rent Draw Test
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.
P6-5
Compressor Leak
Test
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 passes,
otherwise the Compressor Leak Test fails.