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TM 10-4130-239-14
1-10.
GENERAL OPERATION (CONT)
required by the thermostatically controlled blending
valve.
(5) Heat exchanger.The heat exchanger is used to cool
the fuel before
(b) Power System
(1)
(2)
(3)
(4)
(5)
(6)
Engine.
The water chiller engine is of the same
basic 4 stroke cycle design used in automobiles,
trucks and tractors.
As the name indicates, there
are four strokes to one complete power cycle, intake
compression, power, and exhaust.
Starter.
The starter motor uses a gear type
engagement method, similar to an automobile starter.
The starter motor shaft drives a pinion gear into
engagement with a ring gear attached to the engine
flywheel and cranks the engine.
Carburetor.
The carburetor incorporates an
independent high speed fuel circuit and a separate
idle speed fuel circuit.
An integral vacuum pulse
type fuel pump allows remote fuel source.
The pump
will prime at 18 in.
(457 mm) maximum lift.
Ignition.
The ignition system consists of a self-
contained transistor module (no moving parts)
mounted on the ignition armature, and a flywheel
with magnets.
Governor.
The governor spring tends to pull the
throttle open.
The force of the counter weights,
which are operated by centrifugal force, tends to
close the throttle.
The engine speed at which these
two forces balance is called the governed speed.
Lubrication.
Oil has four purposes.
It cools,
cleans, seals and lubricates. The engine is
lubricated with a connecting rod dipper.
(c)
Refrigerant System.
The major components of the
refrigerant system are as follows:
(1) Compressor.
The compressor is used to compress and
circulate R-12 refrigerant through the system.
(2) Condenser Coil.
The condenser coil air-cools the
compressed gas refrigerant reduces it to a liquid at
high pressure.
1-8
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