62-11039 3-8
PRETRIP (Continued)
Test 4 -- Temperature Sensor Check
Check the condition of all of the system temperature
sensors.
Test 4 will last approximately 5 seconds. If a problem is
detected with any of the sensors, the corresponding
alarm will be displayed.
NOTE
Tests 5, 6 an 7 are only performed when unit is
in Engine/Road mode. For Electric Standby
mode, pretrip will skip to Step 8.
Test 5 -- Engine Low Speed
The engine starts up in Low Speed with condenser fans
on. The microprocessor verifies that engine rpm are in
low speed range. If the engine is not operating within
the low speed range, the “CHECK LOW SPEED RPM”
alarm will be displayed.
Test 6 -- Engine High Speed
The engine switches to High Speed and energizes
HTCON1 and HTCON2. The microprocessor verifies
that engine rpm are in high speed range. If the engine is
not operating within the high speed range, the “CHECK
HIGH SPEED RPM” alarm will be displayed.
Test 7 -- Engine Low Speed 2
The engine switches back to Low Speed and heaters
turn off. The microprocessor verifies that engine rpm are
in low speed range. If the engine is not operating within
the low speed range, the “CHECK LOW SPEED RPM”
alarm will be displayed.
Test 8 -- Electric Heater Amperage Check (All
Compartments)
Will energize each heater individually and check for
proper current draw. An alarm will be displayed for any
heater testing outside the current range (amps).
Test 9 -- Evaporator Fan Motors Amperage Check
(All Compartments)
Will energize each evaporator motor contactor
individually and check for proper current draw. An alarm
will be displayed for any fan motors testing outside the
current range (amps).
Test 10 -- Condenser Fan Motors Amperage Check
Will energize condenser motor contactor and check for
proper current draw. An alarm will be displayed if fan
motor tests outside the current range (amps).
Test 1 1 -- Check Compressor Suction Modulation
Valve (CSMV)
This test ensures that the CSMV is opening and closing
properly. If suction pressure doesn’t change as
expected with CSMV closed then “CHECK SUCTION
MOD VALVE” alarm will be displayed. This test may
take several minutes.
Test 12 -- Electronic Expansion Valve (EVXV)
This test checks the operation of the EVXV. If valve
doesn’t test properly “CHECK EVAP SUPERHEAT”
alarm will be displayed.
Test 13 -- Unloaders
This test checks the operation of the unloaders. If
suction and discharge pressures do not change when
UL1 and UL2 are energized and de--energized, the
“CHECK UL1” or “CHECK UL2” alarm will be displayed.
Test 14 -- LSV2 and LSV3
This test will individually check 2LSV and 3LSV for
proper opening and closing. The “C2 CHECK LSV
VALVE” or “C3 CHECK LSV VALVE” alarm will be
displayed.
Test 15 -- Check For Other Alarms
Checks the current alarm list for other active alarms.
Pretrip T ermination
When the Pretrip cycle is completed, the unit will return
to normal temperature control operation.
“PRETRIP PASS” will be shown in the display until the
operator presses any key. In the event that the Pretrip
test triggered an alarm(s), the display will show either
“PRETRIP FAIL & COMPLETE” (if the entire Pretrip
cycle was completed), or “PRETRIP FAIL IN TEST XX”,
(if the Pretrip cycle was aborted by an alarm before it
was completed).
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