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Power plant heaters and fuel warmer |
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|  MIL-T-62518A
less than 52 Celsius (C) (125 Fahrenheit (F)). The coolant system shall include a surge tank
or a coolant recovery reservoir of not less than 1.89 liters (L) (two-quart) capacity. For cooling
system servicing, see 3.4.23.1.
3.4.1.6 Coolant temperature control. Thermostatic control of engine coolant temperature
shall be provided. On diesel engine driven vehicles, the control shall include complete
thermostatic control of all coolant flow through the radiator.
* 3.4.1.7 Fan clutch. A fan clutch shall be provided. The fan clutch shall reduce the fan speed
automatically when the fan is not required for engine cooling. The fan clutch shall be asbestos
free.
* 3.4.1.8 Power plant heaters and fuel warmer. When specified (see 6.2), a coolant heater, an
engine oil heater, and fuel warmers (for diesel engine driven vehicles only) shall be provided.
Heaters shall operate on 120-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. The receptacle shall be located
on the streetside of the vehicle, as near the cab 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). Electrical insulation of the 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, 1500-watt (W) minimum rating, shall be installed in the engine block
or in the lower coolant inlet hose. An 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:
*
(1) Not less than 16 W/L (15 watts per quart) heating capacity
*
(2) Not more than 2.8 watts per square centimeter (W/cm)
(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.
18
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