T-340
4–48
P5-2
Return Probe Test
For units equipped with secondary return probe only.
The temperature difference between return temperature sensor (RTS) and
return temperature sensor (RRS) probe is compared.
Test passes if temperature comparison falls within the specified range.
NOTES
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.
P5-3
Evaporator Fan Direction
Test
If configured for three phase evaporator fan motors:
With evaporator fan running on high speed, measure the temperature dif
-
ference between the primary supply and primary return probes. Turn the
heaters on for 60 seconds then measure the temperature difference be
-
tween the primary supply and primary return probes for up to 120 addition
-
al 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
Primary Evaporator Pres
-
sure Transducer Test
This is a Pass/Fail test of the Primary Evaporator Pressure Transducer.
Test passes if suction pressure transducer (SPT) is /- 0 psi of sat
-
uration 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 (Evaporator) Pres
-
sure 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 Control
-
ler Configuration Verifica
-
tion 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 Installa
-
tion 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 and 4 Volts.
Test fails if Vout is outside of this range.
Test P5-11 must pass before this test is run.
Table 4–7 Controller Pre-trip Test Codes
