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T-372 4–54
P4 Tests - High Speed Evaporator Fans Current Draw: High speed evaporator fans are turned on,
then off. Current draw must fall within specified range and measured current changes must exceed spec
-
ified ratios. No other system components will change state during this test.
NOTE
If unit configured for single evaporator fan operation and either AL11 or AL12 is active at the start of
either test, then the test will fail immediately. If AL11 or AL12 become active during the test, then the
test will fail upon conclusion of the test.
P4-0 High Speed Evaporator Fan
Motors On
Evaporator fans start in the off condition, current draw is measured, then
high speed evaporator fans will be turned on. After 60 seconds the current
draw is measured again. The change in current draw is then recorded.
Test passes if change in current draw in the specified range AND
measured current changes exceed specified ratios.
If the three phase motors are configured IN, the change ratio test is
skipped.
P4-1 High Speed Evaporator Fan
Motors Off
High speed evaporator fans are then turned off. After 10 seconds the
current draw is measured. The change in current draw is then recorded.
Test passes if change in current draw test is in the specified range.
P5 Tests - Air Stream Temperature Sensor Tests: Tests 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.
NOTE
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 if 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.
NOTE
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 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.
Table 4–9 Controller Pre-Trip Test Codes (Continued)