Service manual

3-19
T-294-01
INDEFINITELY, until the user manually enters a
command. Holding the PRE-TRIP key will terminate
the pre-trip mode operation.
When “Auto” or “Auto 1” is allowed to run to
completion without beinginterrupted, theunit willexit
the pre-trip mode, and return to normal control
operation.
CAUTION
When“Auto2”isallowedtorunto
completion without being interrupted, the
unit will terminate pre-trip and d isplay
“Auto 2” “end.” The unit WILL REMAIN
SUSPENDED in this mode until the user
depresses the ENTER key!
c. Auto Test Operation From Serial
Com m unic ations
Pre-tripmay alsobeinitiatedvia communications. The
operation is t he same as for the Auto Test mode
described above except that should a test fail, the
pre-trip mode will automatically terminate. When
initiated via communications, a test may not be
interruptedwithanarrowkey,butthepre-tripmodecan
be terminated with the PRE-TRIP key.
d. Pre-Trip Test Results
At the end of the pre-trip test selection menu, the
message “P,” “rSLts” will be displayed. Pressing the
ENTERkey will allowthe userto seetheresults for all
subtests(i.e.,1-0,1-1,etc).Theresultswillbedisplayed
as“PASS”or“FAIL”forallthetestsrun to completion
sincepowerup.Ifatesthasnotbeenrunsincepowerup,
“
-- -- -- -- -- ” will be displayed.
3.2.2 Pre-Trip Mode
Table 3-5. Pre-Trip Test Codes
Code
No.
TITLE DESCRIPTION
NOTE
“Auto” or “Auto1”menu includesthe following: P, P1, P2, P 3, P4, P 5, P6 andrSLts. “Auto2’(Optional)
menuincludesthefollowing:P, P1, P2, P3, P4,P5, P6,P7,P8, P9, P10 andrSLts. (Refertosection3.2.1.)
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 change in current draw 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 change in current draw 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
seconds.
Pass/Fail Criteria: Passes if change in current draw test is within the range
specified.
P2-1 Condenser Fan Off
Setup: Condenser fan is turned OFF, a current draw test is done after 10
seconds.
Pass/Fail Criteria: Passes if change in current draw test is within the range
specified.
P3
Low Speed
Evaporator 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 P 4-1 will fail immediately if C ontroller alarmcodes
AL11 or AL12 are active at the start of t esting.