Carrier VECTOR 1550 Series - Page 192

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7-76
Alarm
NO.
Steps
ALARM / CAUSE
CORRECTIVE ACTION
P187 CHECK HEATER 1 CIRCUIT (Continued)
460 VAC
CIRCUIT
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.
Must be within range shown in Section 2.11 for all
three legs.
b. Check fuses for heater elements.
F10, F11, and F12 must not be blown.
c. Check voltage at 1HTCON1 con-
tacts.
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.
7
Check Heater Elements
a. Check heater elements with the
unit Off.
No visual physical damage.
Remove and replace if damaged.
b. Check heater element Ohms.
Check from "T" terminals on HTCON1 contactor. See
Section 2.11 for correct Ohm ratings.
8
Check Heater Element Connections
a. Inspect high voltage heater con-
nections at evaporator.
No corrosion, water damage or burning / discoloration.
Remove, repair, or replace if required.
b. Disconnect heater element plug.
Heater resistance per Section 2.11.
Remove and replace heaters if required.
a. Inspect plugs, plug seal and con-
nectors.
No corrosion, water damage or burning / discoloration.
Remove and replace if required.
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.
Must have 0 AC1 Amps and 0 AC2 Amps in Unit Data
List.