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Page Title:
Power plant heaters and fuel warmer |
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|  MIL-T-62497
The governor shall also provide an adjustable no-load speed setting which shall be maintained
within 100 revolutions per minute (rpm) of the selected setting during the compaction cycle.
3.4.1.4 Coolant temperature control. Thermostatic control of engine coolant temperature
shall be provided. The control shall include partial thermostatic control of coolant flow through
the radiator and thermostatically controlled radiator shutters or complete thermostatic control of
all coolant flow through the radiator.
3.4.1.5 Power plant heaters and fuel warmer. When specified (see 6.2), a coolant heater,
an engine oil heater, and a fuel warmer shall be provided. Unless otherwise specified (see 6.2), a
battery heater shall be provided when power plant heaters are specified. All heaters shall operate
on 110-volt alternating current (ac), and shall be wired through a junction block to a single
three-pronged (male), weatherproof, slave receptacle for receiving external power and for
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 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 the connecting cable shall withstand normal operating stresses in low ambient air temperature
(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, and shall provide
positive cable retention during vehicle operation. Heaters shall be furnished as follows:
(a) A coolant heater, 1500-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 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 embody a thermostat to limit the
temperature of the electrolyte to not more than 80F.
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