Carrier VECTOR 6500 Operation & Service Manual page 224

Alarm
Steps
NO.
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 (unit not running): Normal draw for the 1EVCON contactor coil is 0.05 to
2.0 Amps (12 VDC). The circuit tests outside this range.
•
TRIGGER–ON TEST 9 (unit running): Normal draw for the Evaporator Fan motor is 0.7 to 3.5
Amps (460 VAC). The circuit tests outside this range.
•
UNIT CONTROL:
•
RESET CONDITION: Auto Reset if Pretrip is started again, or alarm may be manually reset via
keypad 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 7−2.) Operate the unit through the appropriate modes to see if any active alarm
occurs. Continue with the steps below as necessary.
1 Determine Which Test This Alarm Occurred In
a. Review active alarm list.
b. Clear active alarm list.
c. Restart and monitor Pretrip.
d. Review active alarm list for Alarm
189.
2 Check 1EVCON
a. Inspect Evaporator Fan Motor con-
tactor coil and wire connections.
b. Check contactor coil resistance.
3 Check 1EVCON Amp Draw
12 VDC
Check 1EVCON amp draw.
CIR-
CUIT
4 Check 1EVCON Wiring
Inspect harness & control box con-
nector pins & terminals. (See wiring
schematic Section 10.)
Additional steps on the next page.
Alarm/Cause
Engine and Standby Operation: Pretrip will fail and display
"PRETRIP FAIL AND COMPLETED".
7−91
Corrective Action
Make a note of all alarms.
Stop Pretrip during Test #3 by holding = Key for 6
seconds.
If alarm is present, follow steps 2thru 4 If alarm is not
present, follow Steps 5 thru 8
No damage to coil.
No damage, moisture, or corrosion in connections.
Refer to Section 2.12.
Use Component Test Mode (Section 5.2.2) to test.
Refer to Section 2.12 for correct electrical values.
View current draw in Data List.
No physical damage to harness.
No damage, moisture, or corrosion in connectors.
62-11389