Thermo King Spectrum DE 30-2, Руководство пользователя, Страница: 47 / 140

Electrical Maintenance
47
Fuse Link
The fuse link is located in the positive battery
cable. The fuse link protects the electric system
from a short in the 2 circuit. If the fuse link burns
out, check for a grounded 2 wire before replacing
the fuse link. Replace the fuse link by replacing
the positive battery cable.
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 by the microprocessor during preheat,
just before the engine is started.
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 ohmmeter 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.
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. During preheat
the current draw should be approximately 89
amps at 12.5 volts and approximately 77 amps at
11 volts.
Smart Reefer Multi-Temp µP-IV
Microprocessor Controller
Refer to the appropriate Microprocessor
Controller Diagnosis Manual for complete service
information about the microprocessor controller
and the related components.
Unit Wiring
Inspect the unit wiring and the wire harnesses
during scheduled maintenance inspections for
loose, chaffed or broken wires to protect against
unit malfunctions due to open or short circuits.
1. M6 Terminal
Figure 19: Air Heater
1
AEA693