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OPERATION
Preheating System for Oil, Coolant and Batteries
General
The preheating system is a special equipment and can be
installed in the factory or locally at site. Power supply to the pre-
heating system must be provided through an external power
source.
The following description applies to a typical preheating equip-
ment as it is delivered ex works.
The following systems are equipped with heaters:
Engine cooling system
Engine lubricating system
Hydraulic system (main and suction oil reservoir)
PTO's (pump distributor gears)
Storage batteries
REMARK
The auxiliary heater unit in the cab base and the battery
charger are also connected to the external power source.
Legend for illustration Z 21754
(1)
Main switch board (1X1) for the preheating system,
located in the cab base
(2)
Main switch (1Q1) for all system heaters
(3)
Circuit breakers(1F-1, 1F-2 ...), refer to the electrical
diagram for determination of the protected circuits.
(4)
Heater unit for cab base
(5)
Battery charger (E55)
(6)
Key switch (S153) for battery charger
Be sure to switch off main switch (2) and to disconnect
power supply cable before working on any part of the
heating system.
DO NOT connect power supply cable when the engines
are running. The heating system must not be activated
with the engines running
Use the heating system during stand-still periods e.g. over night
and low ambient temperatures.
The heating system should be energized as soon as the engines
are shut down. This allows the heating system to maintain the
desired temperature with the use of minimum power.
WARNING
3.7 ELECTRICAL EQUIPMENT IN CAB BASE
209
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