MIL-B-45367AA
3.4.1.5 Coolant temperature control. Thermostatic control of the engine coolant
temperature shall be provided to maintain the engine temperature within the engine
manufacturer's recommended operating range. The control shall include complete thermostatic
control of all coolant flow through the radiator, or partial thermostatic control of the coolant flow
through the radiator and thermostatically controlled radiator shutters. When power plant heaters
are specified (see 3.4.1.6), thermostatically controlled radiator shutters shall be provided.
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3.4.1.6 Power plant heaters and fuel warmer. When specified (see 6.2), a coolant heater,
engine oil heater, and fuel warmer shall be provided. Unless otherwise specified (see 6.2), a
battery heater shall be provided when power plant heaters are specified. Heaters shall operate on
110-volt alternating current (ac) and shall be wired through a junction block including a fuse or
circuit breaker, to a single three-pronged (male), weatherproof, slave receptacle for receiving
external power and grounding the vehicle. A three-wire connecting cable, 25 feet long and of
adequate line capacity to supply power for all heater units simultaneously, shall be furnished.
The connecting cable shall include a matching female connector at the vehicle and a standard,
weatherproof, three-pronged (two power plus one ground) male connector at the other end.
Electrical apparatus shall conform to Federal Motor Carrier Safety Regulation 393.77(c)(7).
Electrical insulation of the connecting cable shall withstand normal operating stresses in low
ambient air temperature (down to minus 60°F) without cracking or loss of dielectric capacity.
All heater lead wires shall be installed without interfering with the vehicle component operation
and without loose excess wire. A carrier for the connecting cable shall be mounted within the
engine compartment or stowage compartment(s) and shall provide positive cable retention during
vehicle operation. Heaters shall be furnished as follows:
(a) The coolant heater, 1,500-watt minimum rating shall be installed in the engine block
or lower coolant inlet hose. An engine thermostat with operating range of 170°F to
195°F shall be installed;
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(b) An oil pan heater of permanent external surface mounting, permanent in-pan mount,
or immersion type that meets the following requirements shall be installed,
(1) Not less than 22 watts per quart heating capacity.
(2) Not more than 18 watts per square inch heating capacity.
(3) Thermal balance design or thermostat control providing for uninterrupted
operation.
(4) Provision for mounting below minimum service oil level.
(c) The battery heater shall have a capacity adequate to maintain the battery electrolyte
at a temperature of not less than 10°F during the vehicle exposure in ambient air
temperatures as low as minus 60°F and shall embody a thermostat to limit the
temperature of the electrolyte to not more than 80°F;
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