Carrier VECTOR 6500 Operation & Service Manual page 222

Alarm
Steps
NO.
P188 CHECK HEATER 2 CIRCUIT
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 1HTCON2 contactor coil is 0.05 to
2.0 Amps (12 VDC). The circuit tests outside this range.
•
TRIGGER–ON TEST 8 (unit running): Normal draw for the 1HTCON2 heaters is 1.0 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
188.
2 Check 1HTCON2
a. Inspect heater contactor coil and
wire connections.
b. Check contactor coil resistance.
3 Check 1HTCON2 Amp Draw
Check 1HTCON2 amp draw.
12 VDC
CIR-
CUIT
4 Check 1HTCON2 Wiring
Inspect harness & control box con-
nector pins & terminals. (See wiring
schematic Section 10.)
5 Check Evaporator High Temperature Switch (EVHTS)
Inspect for open EVHTS per 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".
7−89
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 2 thru 4 If alarm is
not present, follow steps 5 thru 10.
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.
If open, replace switch as required.
62-11389