Carrier PrimeLINE Operation And Service Manual page 84

P4-1 High Speed Evaporator Fan Motors Off
High speed evaporator fans are on and current draw is measured. High speed evaporator fans are then
turned off and after 10 seconds the current draw is measured again. The change in current draw is then
recorded.
Test passes if change in current draw test is in the specified range.
Air Stream Temperature Sensor Tests: The P5 tests are to check the validity of the Air Stream Temperature
Sensors.
P5-0 Supply / Return Probe Test
The High Speed Evaporator Fan is turned on and run for eight minutes, with all other outputs de-
energized. A temperature comparison is made between the return and supply probes.
Test passes if temperature comparison falls within the specified range.
If this test fails, "P5-0" and "FAIL" will be displayed. If both Probe tests (this test and the PRIMARY/
SECONDARY) pass, display will read "P5" "PASS."
P5-1 Supply Probe Test
This test is for units equipped with secondary supply probe only.
The temperature difference between primary supply probe and secondary supply probe is compared.
Test passes if temperature comparison falls within the specified range.
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 "P5" "PASS."
P5-2 Return Probe Test
This test is 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.
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
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
T-362
Table 4–6 Controller Pre-Trip Test Codes (Continued)
NOTE
NOTE
NOTES
"-----"
at this time.
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