Carrier Transicold 69NT40-561-001, Руководство по эксплуатации и обслуживанию, Страница: 83 / 182

4–47 T-340
P3-0 Low Speed Evaporator
Fan Motors On
High speed evaporator fans will be turned on for 20 seconds, the fans will
be turned off for 4 seconds, current draw is measured, and then the low
speed evaporator fans are 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 test is in the specified range.
P3-1 Low Speed Evaporator
Fan Motors Off
Low speed evaporator fans are then turned off. After 10 seconds the cur -
rent draw is measured. The change in current draw is then recorded.
Test passes if change in current draw test is in the specified range.
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
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 mea
-
sured 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 cur -
rent 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 be -
tween 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.”
Table 4–7 Controller Pre-trip Test Codes