Carrier 69NT40-561-019 Operation And Service Manual page 67

CODE # TITLE
P5-1 Supply Probe Test
P5-2 Return Probe Test
Evaporator Fan
P5-3
Direction Test
Primary vs Second-
ary Evaporator
P5-7
Temperature
Sensor Test
Suction Pressure
P5-8
Transducer Test
Suction (Evapora-
P5-9 tor) Pressure Trans-
ducer Test
Humidity Sensor
Controller Configu-
P5-10
ration Verification
Test
Humidity Sensor
P5-11 Installation Verifica-
tion Test
Humidity Sensor
P5-12
Range Check Test
Table 4–7 Controller Pre-trip Test Codes (Continued)
Requirements: For units equipped with secondary supply probe only.
Pass/Fail Criteria: The temperature difference between supply temperature sen-
sor (STS) and supply recorder sensor (SRS) probe is compared.
If this test fails, "P5-1" and "FAIL" will be displayed. If both Probe tests (this and
the SUPPLY/RETURN TEST) pass, because of the multiple tests, the display will
read "P 5" "PASS."
Requirements: For units equipped with secondary return probe only.
Pass/Fail Criteria: The temperature difference between return tempera-
ture sensor (RTS) and return temperature sensor (RRS) probe is com-
pared.
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 dis-
play 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.
Requirements: Test P5-0 must pass before this test is run.
Setup: While the evaporator is running on high speed, the temperature differen-
tial between supply temperature sensor (STS) and return temperature sensor
(RTS) probes is measured, with and without heaters energized.
Pass/Fail Criteria: Passes if differential of STS is 0.25 degree C higher than
RTS.
Pass/Fail Criteria: Passes if secondary evaporator temperature sensor (ETS2)
is within +/- 0.5 degree C of the primary evaporator temperature sensor (ETS1).
Requirements: Test P5-7 must pass before this test is run.
Pass/Fail Criteria: Passes if suction pressure transducer (SPT) is within +/- 0 psi
of saturation pressure at current evaporator temperature. Also passes if suction
pressure transducer (SPT) is within +/- 1 psi of discharge pressure 6 hours after
a power interruption.
Pass/Fail Criteria: Passes if suction pressure transducer (SPT) is within +/- 1.5
psi of the evaporator pressure transducer (EPT).
Requirements: Test P5-9 must pass before this test is run.
Test is skipped if controller is not configured for the humidity sensor and the volt-
age is less than 0.20 volts.
Pass/Fail Criteria: Passes if controller configuration has the humidity sensor in
stalled. Fails if controller is not configured for humidity sensor and the voltage is
greater than 0.20 volts.
Requirements: Test P5-10 must pass before this test is run.
Pass/Fail Criteria: Passes if voltage is greater than 0.20 volts for the humidity
sensor. Fails if voltage is less than 0.20 volts for the humidity sensor.
Requirements: Test P5-11 must pass before this test is run.
Pass/Fail Criteria: Passes if the voltage for the humidity sensor is between 0.66
volts and 4 volts. Fails if voltage is outside of the 0.66 volt to 4 volt range.
DESCRIPTION
NOTE
NOTES
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