Carrier 69NT40-561-399 Operation And Service Manual page 89

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.
.
CODE TITLE
P3-0 Low Speed Evapo-
rator Fan Motors
On
P3-1 Low Speed Evapo-
rator Fan Motors
Off
P4 Tests - High Speed Evaporator Fans Current Draw: High speed evaporator fans are turned on, then off. Cur-
rent draw must fall within specified range and measured current changes must exceed specified ratios. No other
system components will change state during this test.
If unit configured for single evaporator fan operation and either AL11 or AL12 is active at the
start of either test, the test will fail immediately. If AL11 or AL12 become active during the test,
the test will fail upon conclusion of the test.
CODE TITLE
P4-0 High Speed Evap-
orator Fan Motors
On
P4-1 High Speed Evap-
orator Fan Motors
Off
P5 Tests - Air Stream Temperature Sensor Tests: Tests the validity of the Air Stream Temperature Sensors.
CODE TITLE
P5-0 Supply/Return
Probe Test
DESCRIPTION
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 mea-
sured again. The change in current draw is then recorded.
Test passes if change in current draw test is in the specified range.
Low 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.
DESCRIPTION
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.
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.
DESCRIPTION
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."
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