4–55
T-372
P5-3 Evaporator Fan Direction Test With evaporator fan running on high speed, measure the temperature
difference between the primary supply and primary return probes. Turn the
heaters on for 60 seconds then measure the temperature difference
between the primary supply and primary return probes for up to 120
additional seconds.
This is a Pass/Fail test. The test passes if differential of STS is 0.25°C
higher than RTS.
Test P5-0 must pass before this test is run.
P5-7 Primary vs. Secondary
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 within
+/- 0.5°C of the primary evaporator temperature sensor (ETS1).
P5-8 Future Expansion
This is no longer active and will be displayed as
“-----”
at this time.
P5-9 Suction (Evaporator)
Pressure Transducer Test
Units equipped with a secondary Evaporator pressure transducer.
Test passes if suction pressure transducer (SPT) is /- 1.5 psi of the
evaporator pressure transducer (EPT).
Test P5-8 must pass before this test is run.
P5-10 Humidity Sensor Controller
Configuration 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 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.
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 humidity sensor is between 0.33 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 sen
-
sors.
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 Current 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.
Table 4–9 Controller Pre-Trip Test Codes (Continued)