Carrier VECTOR 6500 Operation & Service Manual page 223

Alarm
Steps
NO.
P188 CHECK HEATER 2 CIRCUIT - Continued
6 Check Amp Draw of 1HTCON2 Heater Circuit
a. With the unit running and calling for
pull up in, use a clamp on ammeter
to check the current draw of all 3
legs.
b. Check fuses for heater elements
c. Check voltage at 1HTCON2 con-
tacts.
460
VAC
7 Check Heater Elements
CIR-
a. Check heater elements with the unit
CUIT
Off.
b. Check heater element resistance.
8 Check Heater Element Connections
Inspect high voltage heater connec-
tions at evaporator.
9 Verify Accuracy of AC Current Sensor
Put microprocessor in PC Mode. Re-
fer to Section 5.3 page 5−3.
62-11389
Alarm/Cause
7−90
Corrective Action
Must be within range shown in Section 2.11 for all
three legs.
F10, F11, and F12 must not be blown.
Must be within range shown in Section2.11for L1-L2,
L1-L3, and L2-L3.
Must be within range shown in Section 2.11 for
T1-T2, T1-T3, and T2-T3.
No visual physical damage
Remove and replace if damaged
Check from "T" terminals on HTCON2 contactor. See
section 2.11 for correct resistance.
No corrosion, water damage or burning /
discoloration.
Remove, repair, or replace if required.
Must have 0 AC1 Amps and 0 AC2 Amps in Unit
Data.