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Power plant heaters and fuel warmer |
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|  MIL-T-62316B(AT)
system shall be capable of maintaining not more than 27C (80F) dry bulb and 20C (68F) wet
bulb temperature in the driver's and cargo area in outside ambient temperature of 41C (105F).
* 3.4.16 Tinted glass. Tinted glass shall be furnished for the side doors, rear doors and the
windshield. Tinting of the lamination is not acceptable.
* 3.4.17 Power plant heaters and fuel warmer. When specified (see 6.2), a coolant heater, an
engine oil heater, and fuel warmers (diesel engine driven vehicles only) shall be provided.
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 of the vehicle. The receptacle shall be
located on the streetside of the vehicle, as near the driver's door as possible. A three-wire
connecting cable, not less than 7600 mm (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). The electrical insulation of connecting
cable shall withstand normal operating stresses in low ambient air temperatures (down to -51C
(-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 and fuel warmers shall be
furnished as follows:
(a) A coolant heater, 1000-watt (W) minimum rating, shall be installed in the engine block
or lower coolant inlet hose. Engine thermostat with an operating range of 77C (170F)
to 90C (195F) shall be installed
*
(b) An oil pan heater of the permanent external surface mount, permanent in-pan mount, or
immersion type that meets the following requirements, shall be installed:
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(1) Not less than 16 W/L (15 watts per quart) heating capacity
(2) Not more than 2.8 watts per square centimeter (W/cm2) (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) An in-line fuel warmer or preheater unit shall be provided on diesel engine driven
vehicles to prevent clogging of fuel filters due to wax crystallization in the fuel. The
unit shall use engine coolant to transfer sufficient heat to the diesel fuel to heat it from
an inlet temperature of -40C (-40F) to an outlet temperature of -13C (+9F), with a
fuel flow rate not less than the maximum fuel demand of the engine fuel system.
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