Automatic Products 310 Operating & Service Manual Download

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2.03

components

Temperature Monitoring

To display the temperature of all food and/or frozen
cabinets in an installation depress and hold the “C” (for
temperatures to be displayed in Celsius) or “0” (for
temperatures to be displayed in Fahrenheit) button on the
front panel keypad. After three seconds, the temperatures
(in all refrigerated and frozen cabinets present in the
installation) will display for three (3) seconds and continue
to do so until the button is released.

The Refrigeration System

The refrigeration system is comprised of a 3/4 horse
compressor and is a hermetically sealed system (no
service ports).The refrigerant used in the refrigeration
system is 404a and the charge is 28 ounces. The
Compressor is turned on and off by a relay contained in
the refrigerated cabinet junction box.This relay is
energized by the Food Driver Board (FDB).The
temperature sensor is plugged into the P2 connection of
the FDB. The entire refrigeration assembly comes out in
one piece by removing the two screws (to the right of
the condenser) fastening the refrigeration assembly to the
cabinet bottom.

◆

CAUTION: Because of the weight of the refrigeration

assembly it should be removed by two people.

Refrigeration Control

The refrigeration system in the APi 320 cabinets is
controlled by the Electronic control system (ECS)
according to the temperature range selected by the
operator in the MasterMenu system.The temperature
readings from the temperature sensor is accurate to 1ß F.
The temperature sensor data is monitored and the
readings averaged over time. The cabinet temperature is
checked once every 5 seconds. Using the Set
Temperatures menu item, the cabinets may be designated
as Ambient, Food, or Frozen.When a cabinet is
designated as Ambient, the Control System will not control
the temperature in that cabinet and the refrigeration
system in that cabinet will be disabled if it exists.
Temperature readings will still be available for cabinets
designated as Ambient.When a cabinet is designated as
Food or Frozen, the Control System will attempt to
maintain the temperature in the cabinet to within 3° F of
target temperatures specified in the Set Temperatures
menu item during normal operation (this is fixed at 36°F
(2°C) for Food and is settable from -15°F to +10°F (-26°C
to -12°C) for Frozen). To accomplish this, the refrigeration
unit will be turned on when the temperature exceeds the
appropriate target temperature by more than 3°F for 3
seconds during normal operation.The refrigeration unit
will then remain on until the temperature falls 3° below the
target temperature for 3 seconds.

Health Monitoring

The APi 120 and/or Control module allow for accurate
monitoring of all refrigerated and/or frozen cabinets in the
installation.This also allows for shutdown of each cabinet
individually by the machine without impact to the others.
When the machine shuts down a cabinet due to an out of
tolerance temperature, the light in that cabinet is turned
off, all selections in that cabinet disabled, and the display
updated to indicate “CABINET X OUT OF SERVICE”
(where “X” is “1” if the temperature sensor in Cabinet 1
detected the out of tolerance condition, or “2” if the
temperature sensor in Cabinet 2 detected the out of
tolerance condition). A temperature sensor is present in
each refrigerated and/or frozen cabinet.The Pull down
period describes the time elapsed between a cabinet
Power Up (Door Closed) and the point in time when the
cabinet temperature first reaches the target temperature.
Health processing is suspended during the Pull down
period. If the Pull down time period exceeds 75 minutes in
a Frozen cabinet or 30 minutes in a Food cabinet
however, vending will also be disabled in that cabinet for
health reasons. Vending will be allowed again after the
door to that cabinet has been opened and closed.The Pull
down period does not apply to the Ambient cabinets. If at
any time during normal operation after an initial Pull down
period, the temperature in a Frozen cabinet rises above
the set target temperature by 10° F for more than 15
continuous minutes of temperature readings, vending will
be prohibited in that cabinet. If at any time during normal
operation after the initial Power Up Pull down period, the
temperature in a Food cabinet rises above +45° F for
more than 5 continuous minutes of temperature readings,
vending will be prohibited in that cabinet.The cabinet
temperature control processing will remain unaffected by
this vending state. An error message will be recorded
indicating the Health Time-out occurred. Vending will be
allowed again after the door to that cabinet has been
opened and closed.