Service manual

T -318
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Table 3-9 Controller Pre-Trip Test Codes (Sheet 1 of 4)
Code
No.
TITLE DESCRIPTION
NOTE
“Auto” or “Auto1” menu includes the: P, P1, P2, P3, P4, P5, P6 and rSLts. “Auto2” menu
includes P, P1, P2, P3, P4, P5, P6, P7, P8, P9, P10 and rSLts.“Auto3 menu includes P, P1, P2,
P3, P4, P5, P6, P7, P8 and rSLts
P Pre-Trip Initiated
All lights and display segments will be energized for five seconds at the start of
the pre-trip. Since the unit cannot recognize lights and display failures, there are
no test codes or results associated with this phase of pre-trip.
P1-0 Heaters T urned On
Setup: Heater must start in the OFF condition, and then be turned on. A current
draw test is done after 15 seconds.
Pass/Fail Criteria: Passes if current draw change is within the range specified.
P1-1 Heaters T urned Off
Setup: Heater must start in the ON condition, and then be turned off. A current
draw test is done after 10 seconds.
Pass/Fail Criteria: Passes if current draw change is within the range specified.
P2-0 Condenser Fan On
Requirements: Water pressure switch (WP) input must be closed.
Setup: Condenser fan is turned ON, a current draw test is done after 15 sec-
onds.
Pass/Fail Criteria: Passes if current draw change is within the range specified.
P2-1 Condenser Fan Off
Setup: Condenser fan is turned OFF, a current draw test is done after 10 sec-
onds.
Pass/Fail Criteria: Passes if current draw change is within the range specified.
P3
Low Speed Evapo-
rator Fans
Requirements: The unit must be equipped with a low speed evaporator fan, as
determined by the Evaporator Fan speed select configuration variable.
NOTE
If the unit is configured for single evaporator fan operation, Pre-Trip tests
P3-0, P3-1, P4-0 and P4-1 will fail immediately if Controller alarm codes
AL11 or AL12 are active at the start of testing.
P3-0
Low Speed Evapo-
rator Fan Motors On
Setup: The high speed evaporator fans will be turned on for 10 seconds, then off
for two seconds, then the low speed evaporator fans are turned on. A current
draw test is done after 60 seconds.
Pass/Fail Criteria: Passes if change in current draw is within the range speci-
fied. Fails if AL11 or AL12 activates during test.
P3-1
Low Speed Evapo-
rator Fan Motors Off
Setup: The low speed Evaporator Fan is turned off, a current draw test is done
after 10 seconds.
Pass/Fail Criteria: Passes if change in current draw is within the range speci-
fied. Fails if AL11 or AL12 activates during test.
P4-0
High Speed Evapo-
rator Fan Motors On
Setup: The high speed Evaporator Fan is turned on, a current draw test is done
after 60 seconds.
Pass/Fail Criteria: Passes if change in current draw is within the range speci-
fied. Fails if AL11 or AL12 activates during test.
P4-1
High Speed Evapo-
rator Fan Motors Off
Setup: The high speed Evaporator Fan is turned off, a current draw test is done
after 10 seconds.
Pass/Fail Criteria: Passes if change in current draw is within the range speci-
fied. Fails if AL11 or AL12 activates during test.
P5-0
Supply/Return Probe
Test
Setup: The High Speed Evaporator Fan is turned on and run for eight minutes,
with all other outputs de-energized.
Pass/Fail Criteria: A temperature comparison is made between the return and
supply probes.
NOTE
If this test fails, “P5-0” and “FAIL” will be displayed. If both Probe tests (this
test and the PRIMARY/ SECONDARY) pass, the display will read “P5”
“PASS.”