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TM 9-2320-312-10
THEORY OF OPERATION - CONTINUED
0003 00
AUXILIARY ARCTIC HEATER SYSTEM (IF EQUIPPED)
1.
The auxiliary arctic heater system is available for installation on vehicles that will operate in temperatures below
-25F (-32C). The system consists of the following major components:
a.
coolant heater;
b.
Thermal Liner 15 transmission fluid warmer;
c.
120 kJ capacitor; and
d.
two extra batteries.
2.
The coolant heater is mounted on the right frame rail at front of tractor. It is connected to the cooling system, elec-
trical system, and fuel system of the vehicle. It functions to preheat the engine block. The heater pumps coolant
from the engine, heats it, then returns it to the engine. A temperature regulating switch in the unit regulates the cool-
ant temperature between a low of 154F (68C) and a high of 185F (85C), by automatically recycling the heater.
3.
The Thermal Liner 15 fluid warmer is installed in-line between the coolant heater and the transmission; it serves
to heat transmission oil.
COOLANT
THERMAL LINER15
HEATER
WATER IN
TRANSMISSION FLUID
WARMER
TRANSMISSION
ENGINE
RADIATOR
(BOTTOM TANK)
= COOLANT
= TRANSMISSION FLUID
4.
A 7-day timer, mounted under the left side of the instrument panel, operates the auxiliary arctic heater system and
connects to the diagnostic circuit of the coolant heater to allow for troubleshooting capability.
a.
The timer allows for pre-selection of turn-on time, up to seven (7) days in advance, as well as an option for run
times up to 120 minutes before turning off automatically.
b.
There is also an on/off switch for manual operation.
0003 00-8
Change 1

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