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SECTION 3
3-19 T-268-07
c. Auto Test Operation From Serial
Com m unic a t ions
Pre-trip may also be initiated via communications. The
operation is the 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
interrupted with an arrow k ey, but the pre-trip mode can
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
ENTER key will allow the user to see the results for all
subtests(i.e., 1-0, 1-1, etc).Theresultswill bedisplayed
as “PASS” or “FAIL” for all the tests run to completion
sincepowerup. Ifatest has notbeenrun since powerup,
“----------” will be displayed.
3.2.2 Pre-Trip Mode
Table 3-5. Pre-Trip Test Codes
CODE
#
TITLE DESCRIPTION
NOTE
“Auto” or “Auto1” menu includes the following: P, P1, P2, P 3, P4, P5, P6 and rSLts. “Auto2’ (Optional)
menu includes the following: P, P1, P2, P3, P4, P5, P6, P7, P8, P9, P10 and rSLts. (Refer to section 3.2.1.)
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 Turned 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 Turned 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 P4-1 will fail immediately if Controller alarm codes AL11 or
AL12 are active at the start of testing.
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.