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Power plant heaters and fuel warmer |
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|  MIL-T-62319C
3.4.1.8 Silicone rubber hoses. When specified (see 6.2), silicone rubber radiator and heater
hoses shall be furnished.
* 3.4.1.9 Power plant heaters and fuel warmer. When specified (see 6.2), a coolant heater, an
engine oil heater and a fuel warmer (diesel engine driven vehicles only) 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 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 end 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 temperatures (down to minus 60F)
without cracking or loss of dielectric capacity. All heater lead wires shall be installed without
interfering with vehicle component operation, and without loose excess wire. Provisions for
stowage of the cable shall be provided in the vehicle cab. Heaters shall be furnished as follows:
(a) A coolant heater, 1500-watt minimum rating, shall be installed in the engine block or
lower coolant inlet hose. Engine thermostat with an operating range of 170F to 195F
shall be installed
(b) An immersion type engine oil heater, 300-watt minimum rating, with 170F to 195F
thermostat, shall be installed in the oil pan through any convenient opening
(c) The battery heater shall have a capacity adequate to maintain the battery electrolyte at a
temperature of not less than 10F during vehicle exposure in ambient air temperatures as
low as minus 60F, and shall include a thermostat to limit the temperature of the
electrolyte to not more than 80F
(d) A fuel warmer or pre-heater shall be provided on diesel engine driven vehicles to
prevent clogging of fuel filters due to wax crystallization in the fuel. The fuel warmer
shall use engine coolant to transfer sufficient heat to the diesel fuel to heat it from an
inlet temperature of minus 40F to an outlet temperature of plus 9F, with a fuel flow
rate not less than the maximum fuel demand of the engine fuel system. A coolant
shutoff valve shall be provided for the coolant inlet side of the fuel warmer unit.
3.4.2 Electrical systems. Electrical systems shall be in accordance with Federal Motor
Carrier Safety Regulations 393.27 through 393.31 and 393.33.
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