 |
|||
|
Page Title:
Powerplant heaters and fuel warmers |
|
||
| ||||||||||
|
|  MIL-T-45380E(AT)
*
3.4.1.7 Silicone rubber hoses. When specified (see 6.2) silicone rubber radiator and
heater hoses shall be furnished.
*
3.4.1.8 Powerplant heaters and fuel warmers. 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 volts 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. Connecting cable shall include a matching
female connector at the vehicle end and a standard 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 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, 1,000-watt minimum rating, shall be installed in the engine block or
in the lower coolant inlet hose. An engine thermostat with an operating range of
170F to 195oF 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:
(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 10F during vehicle exposure in ambient air
temperature as low as minus 60F, and shall embody 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.
11
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals