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
Summary of Contents for Spectrum DE 30-2
Page 4: ...4...
Page 12: ...Safety Precautions 12...
Page 16: ...Specifications 16...
Page 31: ...Unit Description 31 1 Access Panels 2 Defrost Dampers Figure 12 Back View of Unit 1 2 AGA215...
Page 42: ...Operating Instructions 42...
Page 48: ...Electrical Maintenance 48...
Page 106: ...Structural Maintenance 106...
Page 110: ...Mechanical Diagnosis 110...
Page 114: ...Remote Evaporator Specifications 114...
Page 116: ...Remote Evaporator Maintenance Inspection Schedule 116...
Page 122: ...Remote Evaporator Electrical Maintenance 122...
Page 126: ...Remote Evaporator Refrigeration Service Operations 126...
Page 128: ...Remote Evaporator Structural Maintenance 128...
Page 130: ...Remote Evaporator System Diagnosis 130...
Page 134: ...Wiring and Schematic Diagrams Index 134...
Page 135: ...135 Schematic Diagram Page 1 of 2...
Page 136: ...136 Schematic Diagram Page 2 of 2...
Page 137: ...137 Wiring Diagram Page 1 of 4...
Page 138: ...138 Wiring Diagram Page 2 of 4...
Page 139: ...139 Wiring Diagram Page 3 of 4...
Page 140: ...140 Wiring Diagram Page 4 of 4...