62-61753-21
P189 CHECK EVAPORATOR FAN MOTOR
This device is checked twice in Pretrip - once in Test 2 and again in Test 8.
TRIGGER-ON TEST 2: Normal amps for the 1EVCON contactor coil are 0.05 to 2.0 Amps (12 VDC).
The circuit tests outside this range.
TRIGGER-ON TEST 9: Normal amps for the Evaporator Fan motor are 0.7 to 3.5 Amps (460 VAC).
The circuit tests outside this range.
UNIT CONTROL: Engine and standby operation: Pretrip will fail and display "PRE-TRIP FAIL AND
COMPLETED".
RESET CONDITION: Auto Reset if Pretrip is started again, or alarm may be manually reset via key-
pad or by turning the unit off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, clear the
alarm(s). (See Note 1 Page 7-1) Operate the unit through the appropriate modes to see if any active alarm oc-
curs. Continue with the steps below as necessary.
Determine Which Test Triggered This Alarm
a. Review active alarm list.
Make a note of all alarms.
b. Clear active alarm list.
c. Restart and monitor Pretrip.
Stop Pretrip during Test #3 by holding = Key for
6 seconds.
d. Review active alarm list for Alarm
189.
If alarm is present, follow steps 2thru 4 If alarm is not
present, follow Steps 5 thru 8
a. Inspect Evaporator Fan Motor coil
and wire connections.
No damage to coil.
No damaged or corroded pins.
b. Check contactor coil resistance.
a. Check 1EVCON amp draw.
Use Component Test Mode (Section 5.1.2) to test.
Refer to Section 2.12 for amp values. View current
draw in Data List.
a. Inspect harness & control box
connector pins & terminals. (See
wiring schematic Section 10.)
See Note 2 & Note 5 on Page 7.2.
No physical damage to harness.
No damaged or corroded pins.
Additional steps on the next page.
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