Operating instructions

TM 11574A-OI
2-35
Table 2-8 Controller Pre-Trip Test Codes
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 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 current draw change 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 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 seconds. 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 seconds.
Pass/Fail Criteria: Passes if current draw change 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.
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.”