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RVV Gen II KO Service and Parts Manual

SECTION 2: Vender Component Explanation

Starting Relay - The starting relay is mounted on the side
of the compressor housing. The compressor motor has
two windings (start winding and run winding). To give the

motor torque when it first starts, the starting relay switches

in the additional start winding. After the motor gets up
to speed, the relay opens the start winding and the motor
continues using only the run winding.

Thermal Overload - The thermal overload is a heat-
sensitive device mounted on the side of the compressor
housing. If the compressor motor gets too hot or draws
an excessive amount of current, the thermal overload
will open, breaking the circuit to the compressor. After
the compressor cools to a safe operating temperature, the
thermal overload will close, allowing the compressor and
condenser fan motors to restart.

Condenser Fan and Motor - The condenser fan and motor,
located beneath the cooling department, are a forced-air
device using outside ambient air to cool the surface of the
condenser coil. The condenser fan and motor run while
the compressor operates.

Evaporator Coil - The evaporator coil is located in the
cooling compartment. As low pressure liquid passes
through the evaporator coil, it absorbs and removes
heat from the compartment as it changes to vapor. The

condenser and evaporator coil have aluminum fins attached

to effectively increase their heat exchange surfaces.

Evaporator Fan and Motor - The evaporator fan and motor
are a forced-air device circulating air throughout the
cooling compartment and over the heat exchange surface
of the evaporator coil.

Expansion Valve - The expansion valve is located in the
refrigerant line between the condenser and evaporator coils.
The expansion valve is used as a metering device to control

the flow of liquid refrigerant to the evaporator coil. This

creates a low pressure causing the refrigerant to vaporize
and absorb heat as it passses through the evaporator.

Drier - The drier is located in the refrigerant line between
the capillary tube and condenser. It traps and removes
moisture from the refrigeration system while allowing oil
and refrigerant to pass through the system.

Accumulator - The accumulator is located in the
refrigerant line between the evaporator coil and the
compressor. The accumulator traps any liquid refrigerant
which did not vaporize before it reaches the compressor.

Refrigeration Relay - The refrigeration relay is located in
the lower left section of the vender’s cabinet near the main
wiring harness. The refrigeration relay is responsible for
powering the compressor and condenser fan motors. The
refrigeration relay consists of a coil powered by the control
board (24 VDC) and a switch. When the control board
completes the circuit to the refrigeration relay, the relay
will energize, closing the contact between the common and
the normally-open positions. When this happens, power
(115 VAC) travels from the refrigeration relay to the main
wiring harness for the refrigeration unit.

REFRIGERATION CYCLE

1. The rising temperature in the cooling compartment is

reported to the control board through the temperature

sensor.
2.  The control board registers
the current temperature inside the
vender’s cabinet.  When it rises equal
to or above the pre-programmed
cut-in temperature, the control board
will complete the circuit to the
refrigeration relay to energize its coil.
3.  The refrigeration relay coil closes
the contact between the common
and normally-open positions,
allowing 115 volts to travel to the
main wiring harness to start the
compressor.
4.  The compressor circulates
refrigerant throughout the system
by pulling low-pressure refrigerant
vapor from the evaporator coil,
compressing it, and forcing it into
the condenser. The condenser,
aided by the condenser fan