Rev. 2013.08.19
24
communicates to the VMC. The temperature is pre-set at the factory for efficient and effective
operation.
Figure 20 – Refrigeration unit
CLEANING THE CONDENSER
Dust and dirt restricts good airflow and cooling of the condenser, causing the refrigeration unit will not
chill the beverages properly. Remove the front bottom panel of the refrigeration unit. Brush the dirt
and dust from the condenser fins. You can also blow canned air, available at computer and office
supply stores, on the condenser or vacuum clean it. Do not damage the fins of the condenser while
cleaning. Reassemble the front bottom panel after cleaning.
REFRIGERATION
Refrigeration is the transfer of heat from one area to another. In the case of this machine we are
transferring the heat from the area containing the beverage selections to the outside of the machine
and dissipating the heat throughout the room. The more heat we are able to transfer away from the
beverages the colder they become.
This process is accomplished by the use of a sealed compressing system using an ozone friendly gas
commonly known as R134a refrigerant. The system is comprised of several key mechanical
components: the condenser, the evaporator and the compressor. The condenser is located in the
lower front left of the machine and it is where the heat is dissipated from the cooling process and
blown to the outside of the machine. The evaporator is located inside the machine towards the back
of the cooling system underneath the beverage unit section being cooled. Its purpose is to absorb the
heat from the drink selections and provide the cool air needed to refrigerate the beverages. The
compressor is the heart of the cooling system and its purpose is to provide pressure and circulation of
the refrigeration gas.
The refrigeration system is monitored and controlled by several key electrical components. The
condenser fan, evaporator fan, temperature sensor, VMC, and the start and overload components
located on the side of the compressor. The line voltage from the 115 volt AC outlet in the room is fed
to the two fans, the condenser and the evaporator fans, and they run continuously as long as the
machine is plugged into 115 volt AC power coming from the wall. The temperature sensor and VMC
control the on and off cycling of the compressor. The temperature sensor is located on the back side
of the refrigeration deck.
To determine if the compressor system is running it is sometimes difficult due to the fact that the
compressor tends to be very quiet. The sound and slight vibration from the fans running can
sometimes be mistaken for the compressor running. One way to tell if the compressor system is
running is to cautiously place your hand on the compressor to feel if it is warm. CAUTION as it may
be hot to the touch. If the compressor is stone cold and stays that way for an extended period of time,
you can assume there is an electrical problem in the circuitry or components that operate the
compressor. Another way to see if the compressor is running is to feel the air exiting the condenser
coils from the front to see if there is any heat.
Condenser
Gently
clean fins
on a regular
basis
Temp Sensor
Harness (narrow
plug),
Relay Harness
(narrow plug)
Power Harness
(wide plug)
(unplug all before removal
of the deck)
Compressor
Retainer Fastener
