Thermo King SB-III 30 SR+, Руководство пользователя

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Electrical Maintenance (Rev. 04/02)
30
AIR HEATER
The air heater is mounted on the open end of the intake
manifold. It heats the intake air to help the engine start in
cold weather. The air heater is energized when the Preheat-
Start switch is held in the PREHEAT or START position, or
when the microprocessor initiates a unit start-up (CYCLE-
SENTRY switch in the CYCLE position).
The heater is probably defective if the resistance is more
than 0.2 ohms and the current draw is less than 60 amps, or
if the current draw is more than 100 amps.
Check the resistance of the air intake heater with an ohm-
meter between the M6 terminal on the front of the heater
and the screw on the back of the heater (or the heater case).
The resistance should be 0.1 to 0.2 ohms.
1. Fuse Link
2. Bracket
3. Battery
Fuse Link Location (Early Models Only)
1 3 2
aea823
Check the current draw of the heater with a clamp-on
ammeter at the H1 wire near the M6 terminal on the front of
the heater. Hold the Preheat-Start switch in the PREHEAT
position. The current draw should be approximately 89
amps at 12.5 volts and approximately 77 amps at 11 volts.
.
THERMOGUARD
µ
P V
MICROPROCESSOR CONTROLLER
Refer to the THERMOGUARD µP-V Microprocessor Con-
troller Diagnosis Manual (TK 50042) for complete service
information about the Microprocessor Controller and the
related components.
1. M6 Terminal
Air Heater
1