15
RVV Gen II KO Service and Parts Manual
SECTION 2: Vender Component Explanation
Refrigeration System
The vender’s refrigeration system is responsible for the
cooling of the cabinet and the products loaded within it.
The refrigeration system comes as a completely sealed unit
and should never be cut or tapped into, or the warranty
will be voided.
OPERATION REQUIREMENTS
The refrigeration system requires 115 volts AC from
the main wiring harness for it to operate. The main
wiring harness will get its voltage for the unit from the
refrigeration relay.
COOLING SOFTWARE FEATURES
The RVV Gen II controller software includes the following
refrigeration modes and features:
•
Normal Mode (Energy Saving): When the main door
is closed and switches are made, the controller counts
the number of refrigeration cycles. When this number
equals a stored counter, the refrigeration unit converts
from a pull-down mode, in which the evaporator fan
runs continuously, to a normal mode, in which the
evaporator fan runs only when the compressor is on.
This process normally takes about 24 hours after the
door is shut, with a complete product reload in a 75°F
(24°C) ambient environment.
•
Defrost Mode: The defrost feature is a 30-minute
period in which the compressor is shut off and the
evaporator fan is allowed to run. The defrost feature is
initiated by a timer. The factory setting is three hours,
but this setting may be adjusted in the service menu.
If the unit is already in the defrost mode when the
door is opened, the defrost function will continue after
the door is closed. Because of that, the compressor
may not restart for as much as 30 minutes after the
door is closed.
•
Door Switch Inactivation Mode: If the door switch
does not activate, the fluorescent lights will stay off
and the refrigeration unit will not run until 30 minutes
have passed. After 30 minutes, the controller will
assume that the switch may be defective and will then
start the cooling process. In this mode, the evaporator
fan will cycle with the refrigeration unit (similar to
Normal Mode, but without the counter).
•
Compressor Motor Save Mode: If the controller
calls for cooling continuously for 24 hours, the
vender will go into a defrost mode for one hour. If
the refrigeration unit still does not cycle after an
additional eight hours, a no pull-down error will be
displayed.
Note: This no pull-down error is not
self-clearing; it must be cleared manually through the
service menu or through DEX.
HEALTH SENSOR OPERATION
The rising temperature in the cooling compartment is
reported to the VMC board by the temperature sensor.
At power up, the VMC will check for the temperature.
If the temperature is above 41°F (5°C), the vender will
display “Out of Order.” Once the “Health Safety Failed”
error has been cleared, a 30-minute timer will begin. At
the end of this 30 minutes, the vender will stay in normal
operating mode as long as the temperature remains 41°F
(5°C) or below. If the vender is 41°F (5°C) or below at
power up, the vender will stay in normal operating mode.
If the door is open after power up and the temperature is
41°F (5°C) or below and stays at 41°F (5°C) or below, a
30-minute timer will start after the door is closed. If the
temperature is above 41°F (5°C) after 30 minutes, the
vender will display “Out of Order.” Any time the vender
is in a normal operating mode and the temperature reaches
above 41°F (5°C), a 15-minute timer will start. If after 15
minutes the temperature remains above 41°F (5°C), the
vender will display “Out of Order.”
REFRIGERATION COMPONENTS
The refrigeration system is a sealed system. Described in
this section are explanations of the refrigeration system’s
major components.
Compressor - The compressor is a hermetically-sealed
unit located beneath (outside) the cooling compartment.
The compressor is a pump, driven by the compressor
motor which draws low-pressure vapor (refrigerant) from
the evaporator coil, compresses it, and forces it into the
condenser under high pressure. The motor is started and
controlled by the refrigeration relay.
Condenser - The condenser is located beneath (outside)
the cooling compartment next to the compressor. It can
be seen from the front with the door open. The condenser
removes heat from the high-pressure vapor discharged
from the compressor and condenses it to a high-pressure
liquid. The condenser and evaporator coils have aluminum
fins attached to effectively increase heat exchange
surfaces.