Carrier VECTOR 1550 Series Operation & Service Manual page 192

Alarm
Steps
NO.
P187 CHECK HEATER 1 CIRCUIT (Continued)
6 Check Amp Draw of 1HTCON1 Heater Circuit
a. With the unit running and calling
for Heat, use a clamp on ammeter
to check the current draw of all
3 legs.
b. Check fuses for heater elements.
c. Check voltage at 1HTCON1 con-
tacts.
7 Check Heater Elements
a. Check heater elements with the
460 VAC
unit Off.
CIRCUIT
b. Check heater element Ohms.
8 Check Heater Element Connections
a. Inspect high voltage heater con-
nections at evaporator.
b. Disconnect heater element plug.
a. Inspect plugs, plug seal and con-
nectors.
9 Verify Accuracy of AC Current Sensor
a. Place SROS in the OFF position.
Put microprocessor in PC Mode.
See Note 5 Page 7.2.
62-61753-21
ALARM / CAUSE 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 Section 2.11 for 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 HTCON1 contactor. See
Section 2.11 for correct Ohm ratings.
No corrosion, water damage or burning / discoloration.
Remove, repair, or replace if required.
Heater resistance per Section 2.11.
Remove and replace heaters if required.
No corrosion, water damage or burning / discoloration.
Remove and replace if required.
Must have 0 AC1 Amps and 0 AC2 Amps in Unit Data
List.
7-76