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Test 2 - 12VDC Electrical Component Amperage Check: Test 2 will check the amperage (current) draw of the
following components:
• Battery Amp Draw (All Components Turned Off).
• AutoFresh Air Exchange Relay (AFAR) if equipped
• Liquid Injection Valve
• Preheat Circuit (Glow Plugs)
• Condenser Fan Contactor #1
• Condenser Fan Contactor #2
• Evaporator Fan Contactor
• Compressor Contactor
• Generator Contactor
• Standby Contactor
• Heater #1 Contactor
• Heater #2 Contactor
Each component will be individually checked for proper current draw. An alarm will be activated for any component
not drawing amperage in the expected range. If equipped the AutoFresh air port opens and closes in Test #2.
Test 3 - Temperature Sensor Check: Check the condition of all of the system temperature sensors. Test 3 will
last approximately five seconds. If a problem is detected with any of the sensors, the corresponding alarm will be
activated. Refer to Alarm Section 7.3.
NOTE
Tests 4, 5 and 6 are only run when unit is in Engine Operation.
Test 4 - Engine Low Speed: The APX Control System verifies that engine is in the low speed range and the
engine load is displayed. If the engine is not operating in the low speed range, alarm P00174 Check Low Speed
RPM will be activated.
Test 5 - Engine High Speed: The engine switches to high speed. The control system verifies that engine is in the
high speed range and the engine load is displayed. If the engine is not operating in the high speed range, alarm
P00175 Check High Speed RPM will be activated.
Test 6 - Engine Low Speed: The engine switches back to low speed and the engine load is displayed. The control
system verifies that engine returns to the low speed range within 10 seconds. If not, alarm P00174 Check Low
Speed RPM alarm will be activated.
Test 7 - Electric Heater Amperage Check: Each heater will be energized individually and checked for proper cur-
rent draw. An alarm will be activated for any heater not drawing amperage in the expected range; P00187 Check
Heater 1 Circuit / P00188 Check Heater 2 Circuit.
Test 8 - Evaporator Fan Motor: The evaporator motor contactor will be energized and the motor checked for
proper current draw. Alarm P00189 Check Evaporator Fan Motor will be activated if the evaporator fan motor is
not drawing amperage in the expected range.
Test 9 - Condenser Fan Motors: The condenser fan motor contactors will be energized and the motors checked
for proper current draw. An alarm will be activated, P00190 Check Condenser Fan Motor or P00190 Check Con-
denser Fan Motor if a condenser fan motor is not drawing amperage in the expected range.
Test 10 - Check Suction Modulation Valve (CSMV): This test is run to ensure that the CSMV is opening and
closing properly. If suction pressure doesn’t change as expected with CSMV closed, then alarm P00180 Check
Suction Modulation Valve will be displayed.
Test 11 - Evaporator Expansion Valve (EVXV): This test is an operational check of the EVXV. If evaporator outlet
pressure doesn’t change as expected with the EVXV closed then alarm P00177 Check EXV (EVXV) Superheat
will be displayed.
Test 12 - Economizer Expansion Valve (ECXV): This test is an operational check of the ECXV. If economizer
outlet pressure doesn’t change as expected with the ECXV closed then alarm P00173 Check Economizer will be
displayed.
Test 13 - Liquid Injection Solenoid Valve (LIV): This test checks the operation of the liquid injection solenoid
valve. If compressor suction temperature does not change when LIV is energized, alarm P00179 Check LIV will be
displayed.
Pretrip Termination: When the Pretrip cycle is completed, the unit will return to normal temperature control oper-
ation. “PRETRIP PASS” will be displayed until the operator presses the EXIT key. In the event that the Pretrip test
activates an alarm(s), either “PRETRIP FAIL and COMPLETE” (if the entire Pretrip cycle was completed), or “PRE-
TRIP FAIL IN TEST XX”, (if the Pretrip cycle was aborted by an alarm before it was completed) will be displayed.
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