Service manual

3-20T-294-01
Code
No.
DESCRIPTIONTITLE
P3-0
Low Speed
Evaporator 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
specified. Fails if AL11 or AL12 activates during test.
P3-1
Low Speed
Evaporator 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
specified. Fails if AL11 or AL12 activates during test.
P4-0
High Speed
Evaporator 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
specified. Fails if AL11 or AL12 activates during test.
P4-1
High Speed
Evaporator 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
specified. 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.”
P5-1 Supply Probe Test
Requirements: For units equipped with secondary supply probe only.
Pass/Fail Criteria: The temperature difference between primary and secondary
probe (supply) is compared.
NOTE
Ifthistestfails,“P5-1”andFAILwillbedisplayed.IfbothP robetests(this
and theSUPPLY/ RETURNTEST)pass, becauseofthemultipletests,the
display will read ’P 5’ ’PASS’.
P5-2 Return Probe Test
Requirements: For units equipped with secondary return probe only.
Pass/Fail Criteria: The temperature difference between primary and secondary
probe (return) is compared.
NOTES
S 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.”
S The results of Pre-Trip tests 5-0, 5-1 and 5-2 will be used to activate or
clear control probe alarms.
P6-0 Compre ssor On
Setup: A current draw test is performed before the compressor is started. The
compressor is started. SMV is opened to 30%, and another current draw test is
performed. If it is the first compressor start, the compressor reliability
enhancement logic (CREL) is executed, running a current draw test on the
additional output of the following state:
Component
Normal Logic
(10 seconds)
CREL (3 minutes)
SMV 30% 100% (for 3 minutes) then 30%
P-6 Not Applicable This test is not in use starting with model number 69NT40-511-200 and UP.