Vendo 2000 Service Manual
MARS SERIES 2000
CONFECTIONERY VENDOR
MANUAL
P/N: 1122551
REV A: 3/2002
TC-1
“MARS” TABLE OF CONTENTS
SAFETY ................................................................................................................ Pages S-1 – S-15
A COMMITMENT TO SAFETY ............................................................................. Page S-2
VENDOR INSTALLATION .................................................................................... Pages S-3 – S-6
ELECTRICAL HAZARDS ...................................................................................... Pages S-7 – S-8
MECHANICAL HAZARDS .................................................................................... Pages S-9 – S-10
REFRIGERATION HAZARDS .............................................................................. Page S-11
TEMPERATURE HAZARDS ................................................................................. Page S-12
SUBSTITUTION AND MODIFICATIONS ............................................................. Pages S-12 – S-13
CONSUMER SAFETY WARNING ........................................................................ Page S-14
GENERAL INFORMATION .................................................................................. Pages G-1 – G-16
GENERAL INFORMATION ................................................................................... Page G-2
INITIAL SET UP ................................................................................................... Pages G-3 – G-4
LABEL INSTALLATION ........................................................................................ Page G-5
ALIGNMENT CHECKS ......................................................................................... Page G-6
VENDOR TEMPERATURE CONTROL SETTING ............................................... Page G-7
ELECTRO-MECHANICAL FUNCTIONAL DESCRIPTION ................................... Pages G-8 – G-11
REFRIGERATION SYSTEM - FUNCTIONAL DESCRIPTION ............................. Pages G-12 – G-13
HEATING SYSTEM – FUNCTIONAL DESCRIPTION .......................................... Page G-13
VENDOR ELECTRONIC CONTROL .................................................................... Pages G-14 – G-15
MARS PROGRAMMING ...................................................................................... Pages PR-1 – PR-30
MODE 1: OPERATION MODE ............................................................................ Pages PR-2 – PR-4
MODE 2: SERVICE MODE ................................................................................. Pages PR-4 – PR-7
MODE 3: SET PRICE MODE .............................................................................. Page PR-7
MODE 4: MACHINE TEST MODE ....................................................................... Pages PR-7 – PR-11
MODE 5: SPACE TO SALES INQUIRY MODE ................................................... Page PR-11
MODE 6: MIS DISPLAY MODE ........................................................................... Pages PR-11 – PR-17
MODE 7: ENTRY CODE MODE .......................................................................... Page PR-18
MODE 8: SPACE TO SALES (STS) PROGRAMMING MODE ........................... Pages PR-18 – PR-21
MODE 9: DISPLAY PROGRAMMING MODE ..................................................... Pages PR-21 – PR-22
MODE 10: MACHINE RESET MODE .................................................................. Pages PR-22 – PR-23
MODE 11: TOUCH UP/DOWN LOAD MODE ..................................................... Pages PR-23 – PR-24
MODE 12: SET TIME FUNCTIONS MODE ......................................................... Pages PR-24 – PR-27
MODE 13: TOKEN ENABLING MODE ................................................................ Page PR-27
MODE 14: SET MIS ACCESS MODE ................................................................. Pages PR-27 – PR-29
MAINTENANCE ................................................................................................... Pages M-1 – M-12
MAINTENANCE .................................................................................................... Pages M-2 – M-3
REFRIGERATION OPERATION .......................................................................... Pages M-4 – M-6
REFRIGERATION PARTS DESCRIPTION .......................................................... Pages M-7 – M-9
WIRING DIAGRAMS ............................................................................................ Pages M-10 – M-11
MARS PARTS SECTION ..................................................................................... Pages PS-1 – PS-42
READING A PARTS LIST ..................................................................................... Page PS-2
HARDWARE LIST ................................................................................................ Pages PS-3 – PS-5
OUTER DOOR...................................................................................................... Pages PS-6 – PS-7
SELECTION PANEL ............................................................................................. Pages PS-8 – PS-9
OUTER DOOR (INSIDE VIEW) ............................................................................ Pages PS-10 – PS-11
REFUND MOTOR ASSEMBLY ............................................................................ Pages PS-12 – PS-13
TC-2
COIN ENTRY ASSEMBLY ................................................................................... Pages PS-14 – PS-15
CONTROLLER ASSEMBLY ................................................................................. Pages PS-16 – PS -17
INNER DOOR ASSEMBLY ................................................................................... Pages PS-18 – PS-19
CABINET ASSEMBLY .......................................................................................... Pages PS-20 – PS-21
ELECTRONIC COMPONENTS ............................................................................ Pages PS-22 – PS-23
OPTIC ASSEMBLY............................................................................................... Pages PS-24 – PS-25
INTERNATIONAL AIR DAM ASSEMBLY ............................................................. Pages PS-26 – PS-27
BAR MODULES .................................................................................................... Pages PS-28 – PS-29
LEFT HAND BAR MODULE ................................................................................. Pages PS-30 – PS-31
BAG MODULE ...................................................................................................... Pages PS-32 – PS-33
UNIVERSAL MODULE ......................................................................................... Pages PS-34 – PS-35
REFRIGERATION ASSEMBLY ............................................................................ Pages PS-36 – PS-37
HARNESS QUICK REFERENCE GUIDE ............................................................. Page PS-38
LABELS, DECALS AND GRAPHICS .................................................................... Page PS-39
SUGGESTED SPARE PARTS ............................................................................. Pages PS-40 – PS-41
TROUBLESHOOTING ......................................................................................... Pages T-1 – T-11
VENDO WARRANTY ............................................................................................ Page T-2
TROUBLESHOOTING GUIDE ............................................................................. Pages T-3 – T-8
PARTS, SALES, & SERVICE CENTERS OF VENDO/SANDEN COMPANY ...... Pages T-9 – T-10
TC-3
SAFETY
S-1
A COMMITMENT TO SAFETY
The Vendo Company is committed to safety in every aspect of our product design. Vendo is
committed to alerting every user to the possible dangers involved in improper handling or
maintenance of our equipment. The servicing of any electrical or mechanical device involves
potential hazards, both to those servicing the equipment and to users of the equipment.
These hazards can arise because of improper maintenance techniques. The purpose of this
manual is to alert everyone servicing Vendo equipment of potentially hazardous areas, and to
provide basic safety guidelines for proper maintenance.
This manual contains various warnings that should be carefully read to minimize the risk of
personal injury to service personnel. This manual also contains service information to insure
that proper methods are followed to avoid damaging the vendor or making it unsafe. It is also
important to understand these warnings are not exhaustive. Vendo could not possibly know,
evaluate, or advise of all of the conceivable ways in which service might be done. Nor can
Vendo predict all of the possible hazardous results. The safety precautions outlined in this
manual provide the basis for an effective safety program. Use these precautions, along with
the service manual, when installing or servicing the vendor.
We strongly recommend a similar commitment to safety by every servicing organization. Only
personnel properly trained in vendor servicing should have access to the interior of the
machine. This will minimize the potential hazards that are inherent in electrical and
mechanical devices. Vendo has no control over the machine once it leaves the premises. It is
the owner or lessor’s responsibility to maintain the vendor in a safe condition. See Section I of
this manual for proper installation procedures and refer to the appropriate service manual for
recommended maintenance procedures. If you have any questions, please contact the
Technical Services Department of the Vendo office nearest you. Refer to the listing at the
back of this manual.
SAFETY RULES
• Read the Safety Manual before installation or service.
• Test for proper grounding before installing to reduce the risk of electrical shock and fire.
• Disconnect power cord from wall outlet before servicing or clearing product jams. The
vending mechanism can trap and pinch hands.
• Use only fully trained service technicians for “Power On” servicing.
• Remove any product prior to moving a vendor.
• Use adequate equipment when moving a vendor.
• Always wear eye protection, and protect your hands, face, and body when working near the
refrigeration system.
• Use only authorized replacement parts.
• Be aware of inherent dangers in rocking or tipping a vending machine.
• Always turn power off before plugging or unplugging vendor to wall outlet.
•
S-2
SECTION I: VENDOR INSTALLATION
A. Vendors are large, bulky machines of significant size and weight. Improper handling can
result in injury. When moving a vendor, carefully plan the route to be taken and the
people and equipment required to accomplish the task safely.
B. Remove all tape, shipping sealant, and Styrofoam from the vendor. Loosen any
shipping devices used to secure interior parts during shipping. Remove the wooden
shipping base, attached to the vendor base by the vendor leveling screws. Make
certain the leveling screws are in place and functional.
C. Position the vendor three to four inches (7.6 cm to 10.2 cm) from a well-constructed wall
of a building or otherwise on a flat, smooth surface.
IMPORTANT: The vendor requires three inches (7.6 cm) of air space from the wall to
ensure proper air circulation to cool the refrigeration unit.
D. Adjust the leveling screws to compensate for any irregularities on the floor surface.
Ideally, no adjustment will be necessary and the leveling legs will be flush with the
bottom of the vendor. A spirit level is a useful aid to level the vendor. When the vendor
is properly leveled, the outer door, when opened, will remain stationary. Vendors must
be level to insure proper operation and to maintain stability characteristics. Do not add
legs to the vendor.
E. Check the manufacturer’s nameplate on the left side of the vendor outer door to verify
the main power supply requirements of the vendor. Be sure the main power supply
matches the requirements of the vendor. To ensure safe operation, plug the vendor
only into a properly grounded outlet.
DO NOT USE EXTENSION CORDS.
F. Ensure the power supply meets the rating of the machine (voltage & amp rating).
NOTE: Any power supply variance more than +
* Power outlets must be properly grounded.
* Power outlets must be properly polarized, where applicable.
10% may cause vendor to malfunction.
With the relevant test device, test the above conditions.
IF THE ABOVE CONDITIONS ARE NOT
MET FOR THE GIVEN OUTLET TYPE,
CONTACT A LICENSED ELECTRICIAN
AND HAVE THE NECESSARY
CORRECTIONS MADE.
S-3
SECTION I: VENDOR INSTALLATION (CONT’D)
G. Door Support (Figure 2)
The door support is to insure that the outer
door closes squarely to the cabinet. Raising
or lowering the door support can also insure
proper alignment of the door latch.
H. Door Latch Alignment (Figure 3)
After any door adjustment, the floating
Quicker Lock assembly should align itself
automatically. The latch assembly is
adjustable. To adjust, loosen the latch
bracket mounting screws, and raise or lower
the latch assembly into position, then tighten
the mounting screws.
LATCH
BRACKET
FIGURE 2
DO NOT INSERT OBJECTS
INTO LOCK CAVITY.
MOUNTING
SCREW
FIGURE 3
TO FREE OBJECTS, REMOVE
LOCK CAP AS SHOWN
KEEP FINGER AND OTHER OBJECTS
OUT OF LOCK CAVITY.
NOTE: Refer to the appropriate Parts and Service Manual for detailed instructions,
operating principles, and recommended maintenance intervals and procedures.
S-4
SECTION II: ELECTRICAL HAZARDS
GENERAL
Vendo vending machines are provided with the appropriate power supply setting for your area.
All models are equipped with transformers, enabling the vending machine to operate on
different mains voltages. Refer to the appropriate Service Manual for details of transformers
operations.
The power sources are standard for both household and commercial lighting and appliances.
However, careless or improper handling of electrical circuits can result in injury or death.
Anyone installing, repairing, loading, opening, or otherwise servicing a vending machine
should be alerted to this point. Apply all of the normal precautions observed in handling
electrical circuits, such as:
• Refrigeration servicing to be performed by qualified personnel only.
• Unplug the vendor or move power switch to off position before servicing or clearing product
jams.
• Replace electrical cords if there is any evidence of fraying or other damage.
• Keep all protective covers and ground wires in place.
• Plug equipment into outlets that are properly polarized, where applicable, and protected
with fuses or circuit breakers.
• All electrical connections must be dry and free of moisture before applying power.
A. Grounding Systems
Vendo vending machines are provided with the appropriate service cord for the power
supply in your area. The service cord will connect to the matching electrical outlet.
Always ensure that the outlet to be used is properly grounded, and polarized where
applicable, before plugging in the vendor.
ALWAYS TEST TO VERIFY PROPER
GROUNDING PRIOR TO
INSTALLATION IN ORDER TO
REDUCE THE RISK OF
ELECTRICAL SHOCK AND FIRE
The electrical grounding system also includes the bonding of all metal components within the
vendor. This involves a system of bonding wires identified by green or green and yellow
marking. The system uses serrated head screws, lock washers, and star washers to insure
the electrical connection between parts. Maintenance of vending equipment may involve
disassembly. Include the above items when reassembling, even if the vending machine may
appear to function normally without them. Omitting any of these items can compromise a link
in the grounding system. See the appropriate Service Manual or kit instructions for
components and assembly instructions.
S-5
SECTION II: ELECTRICAL HAZARDS (CONT’D)
B. Servicing with “Power Off”
For maximum safety, unplug the service cord from the wall outlet before opening the
vendor door. This will remove power from the equipment and avoid electrical and
mechanical hazards. Service personnel should remain aware of possible hazards from
hot components even though electrical power is off. See the appropriate sections of
this manual for further information.
C. Servicing with “Power On”
Some service situations may require access with power on. Only fully qualified service
technicians should perform power-on servicing. Particular caution is required in
servicing assemblies that combine electrical power and mechanical movement.
Sudden movement, to escape mechanical action, can result in contact with live circuits
and vice versa. It is therefore doubly important to maintain maximum clearances from
both moving parts and live circuits when servicing.
D. Lithium Battery
This machine contains a Lithium Battery mounted on the VMC board. Always properly
dispose of used batteries. DO NOT attempt to recharge battery. DO NOT throw battery
into fire or expose to heat.
BATTERIES. DO NOT HEAT OR THROW
ONLY FULLY TRAINED PERSONNEL
SHOULD ACCOMPLISH “POWER-ON”
SERVICING. SUCH SERVICE BY
UNQUALIFIED INDIVIDUALS CAN BE
DANGEROUS.
EXPLOSION HAZARD. ALWAYS
PROPERLY DISPOSE OF USED
INTO FIRE. SERIOUS INJURY OR
DEATH MAY RESULT.
S-6
SECTION III: MECHANICAL HAZARDS
A. Servicing of Moving Parts and Assemblies
When servicing assemblies involving moving parts, use extreme caution!! Keep
fingers, hands, loose clothing, hair, tools and other foreign material clear of entrapment.
As noted before under the Electrical Hazards section, “Power On” qualified personnel
should only perform servicing. Refer to and heed the warnings noted in Electrical
Hazards section. These warnings refer to the potential hazards associated with
electrical power and moving parts. Always maintain maximum clearances from
electrical and moving parts.
Always reinstall protective covers and guards when reassembling equipment.
THIS VENDING MACHINE INCLUDES
MECHANICAL EQUIPMENT WHICH CAN
BE HAZARDOUS IF IMPROPERLY
HANDLED OR SERVICED. USE CAUTION
AND CONSULT THE VENDO SAFETY
MANUAL AND THE VENDO SERVICE
MANUAL FOR ADDITIONAL SAFETY
INFORMATION.
RISK OF ENTRAPMENT!
RISK OF ELECTRICAL!
S-7
SECTION IV: REFRIGERATION HAZARDS
GENERAL
Refrigeration systems involve both electrical power and mechanical action. These systems
may present any of the potential dangers shown in the sections on Electrical and Mechanical
Hazards contained in this manual.
A. Compressed Refrigerant
Refrigeration systems involve the compression and evaporation of gases. The
pressures contained represent a potential hazard if suddenly released in confined
areas. Caution is required when performing maintenance tests or repairs. Trained
personnel who are familiar with the systems and pressures involved should do all
testing of sealed refrigeration systems.
B. Physical Protection
The accidental release of refrigerant gases can result in physical injuries. Always wear
protective glasses and protect your hands, face, and body when working near the
refrigeration system.
ALWAYS WEAR EYE PROTECTION
AND PROTECT YOUR HANDS, FACE,
AND BODY WHEN WORKING NEAR
THE REFRIGERATION SYSTEM.
S-8
SECTION V: TEMPERATURE HAZARDS
GENERAL
Maintenance personnel should be alert to the potential hazards from hot metal surfaces. High
temperatures may be present throughout the refrigeration system although electrical power
has been removed.
SECTION VI: SUBSTITUTIONS AND MODIFICATIONS
GENERAL
Unauthorized changes, or the substitution of unauthorized parts, can compromise the
equipment designs. This can result in unsafe conditions for either the service personnel or the
equipment users. Always refer to the appropriate Parts and Service Manual for replacement
parts and maintenance instructions. If questions arise, contact the Technical Services
Department of the Vendo office in your area. (See pages T–10 and T-11.)
When servicing the vending machine, always reassemble all components to their original
location and position. Maintain the correct routing for tubing, electrical wiring, etc. Replace all
clamps, brackets, and guides to their original locations. Replace all tubing, sleeving, insulating
material, and protective covers to their original condition.
VENDO EQUIPMENT HAS BEEN PROVIDED
WITH APPROPRIATE PROTECTIVE
DEVICES TO PROTECT AGAINST THE
POSSIBILITY OF OVERHEATING AND FIRE,
AS A RESULT OF EQUIPMENT OR
COMPONENT FAILURES. SUBSTITUTION,
MODIFICATION, OR BYPASSING OF SUCH
PROTECTIVE DEVICES CAN CREATE
DANGEROUS CONDITIONS. PROTECTIVE
CIRCUITS SHOULD NEVER BE BYPASSED,
AND FAILED PROTECTIVE DEVICES MUST
BE REPLACED ONLY WITH FACTORY-
AUTHORIZED PARTS.
A. Service Cord Replacement
Vendo vending machines are furnished with unique power supply cords. If replacement
becomes necessary, consult the Parts Section and order the correct replacement cord
for the model of vending machine in question. Do not use substitute replacement cords.
Only authorized service personnel with appropriate training should replace the vending
machine service cord. If a question should arise concerning which service cord to
order, contact the Technical Services Department of the Vendo office in your area for
assistance.
S-9
SECTION VI: SUBSTITUTIONS AND MODIFICATIONS (CONT’D)
THIS APPLIANCE MUST BE EARTHED
IMPORTANT
The wires in the main leads are colored in accordance with the following code:
110V/120V 220V/240V
Green Green and Yellow ............................ Earth
White Blue .................................................. Neutral
Black Brown ............................................... Live
S-10
SECTION VII: CONSUMER SAFETY WARNING
CRUSH HAZARD
VENDOR CAN BE OVERTURNED IF
SUFFICIENT FORCE IS APPLIED, AND MAY
RESULT IN SERIOUS INJURY OR DEATH.
GENERAL
There have been incidents, including fatalities, when vending machines have been vandalized
by being pulled over in an attempt to obtain free product or money.
To warn of the danger involved in tipping, shaking, or rocking the vending machine, a decal
has been designed to be affixed to vending machines. (One such decal is supplied with the
vending machine.) Vendo will supply sufficient decals to be placed on all machines, on
request. Should you require additional information, contact a service representative. See
parts, sales and service centers listed on page T-10 and T-11.
THE FOLLOWING DECAL SHOULD BE PLACED IN A POSITION ON THE
VENDOR CONTROL PANEL AT EYE LEVEL.
WARNING
Never rock or tilt.
Machine can fall over
and cause serious
injury or death.
Vending machine will
not dispense free
product.
MISE EN
GARDE
Ne jamais secouer
ou incliner.
Le distributeur peut
se renverser et causer
des blessures graves
ou la morte.
Cette machine ne
distribue pas de
produits gratuitement.
Nunca voltie o incline
esta maquina.
Puede caer sobre usted
y cauzarle heridas
graves o matarle.
Esta Vendomatica no
provee producto gratis.
ENGLISH
389611A
389611-1A
FRENCH
S-11
SPANISH
389611-2A
NOTES
S-12
GENERAL INFORMATION
G-1
G-2
GENERAL INFORMATION
This manual contains programming, operation, and complete parts and electrical wiring
diagrams.
The Mars controller has a microprocessor that will permit pricing per selection from 0.00 to
99.99. This machine also has space-to-sales programming.
Specifications:
MODEL
SELECTIONS
DIMENSIONS (HEIGHT X WIDTH X DEPTH)
SERIES 2000
72” x 39“ x 30” (183cm x 99 cm x 76 cm)
VENDING PRODUCT CAPACITY:
BAR MODULES:
46 BARS PER COL.
4 COL. PER MODULE
TOTAL:184 BARS PER
MODULE
SHIPPING WEIGHT
OPERATION VOLTAGE
BAG MODULE:
39 BAGS PER COL.
3 COL. PER MODULE
TOTAL:117 BAGS PER
MODULE
685 POUNDS (311 kg)
115v 60 Hz.
(U.S.)
AMP. RATING
REFRIGERATION
VOLTAGE
115v 60Hz.
(U.S.)
*Dimensions and shipping weight will vary slightly due to manufacturing tolerances, shipping
boards, and whether or not coinage is installed.
MARS
12
UNIVERSAL MODULE:
21 BAGS PER COL.
3 COL. PER MODULE
TOTAL:63 BAGS PER
MODULE
220v 50 Hz
(Int’l)
10
220v 50 Hz
(Int’l)
240v 50Hz
(UK, Australia)
240v 50Hz
(UK, Australia)
G-3
INITIAL SET UP
A. UNPACKING
Remove all plastic film, cardboard, and tape from the outside of the vendor. Loosen
any shipping devices used to secure interior parts during shipment.
To remove shipping boards from base, raise vendor on a well-stabilized lifting device.
Remove the leveling bolts, which hold the boards in place and remove the boards.
Replace bolts to equal heights in the threaded holes.
Another method to remove shipping boards is to split the boards apart. Using a pinch
bar, or a heavy screwdriver and hammer, insert tool into the slots and force the board
apart.
B. POSITIONING AND LEVELING
IMPORTANT: PLACE THE VENDOR (IN DESIRED LOCATION) AT LEAST 3 TO 4
INCHES or 8 TO 10 CM AWAY FROM ANY REAR OBSTRUCTION. This is for proper
airflow through the refrigeration compartment. The system requires front to rear air
circulation for proper operation. Level vendor with leveling bolts. Be sure all four
leveling bolts are supporting the machine.
C. POWER SUPPLY CONNECTION
DO NOT USE AN EXTENSION CORD
The vendor’s power requirements will vary depending upon the country it was
purchased for. To verify the power requirements of the vendor, check the serial plate
located on the hinge side of the door (see Figure 4 on page G-4). The power
requirements are listed on the serial plate.
To insure safe operation of the vendor, the vendor’s power supply must be a properly
grounded and polarized outlet. Before plugging the vendor into the outlet, test the outlet
to confirm it will meet the vendor’s power requirements. If the power supply of the outlet
is different from the power requirements of the vendor, different settings on the
transformer may be necessary.
If the power requirements are not properly met, contact a licensed electrician and have
the necessary correction made.
Should you require additional information, contact a service representative. See the
parts, sales and service centers listed in the back of this manual.
G-4
,
0
R
A
V
INTRODUCTION AND MODEL IDENTIFICATION
Example:
APPROVED FOR OUTDOOR USE
MODEL
SERIAL NO.
Lot Code: YYMMDD
BASIC
UNIT
LR 13085
CHARGE
MIN. TEST PRESSURE APPLIED - PSI
LOW SIDE 14
OZ. R-134a
HIGH SIDE 235
endo
THE VENDO COMPANY FRESNO
CA.
R
239L
VENDING MACHINE
REFRIGERATED
MPS
115v
50/60
1
POWER REQUIREMENTS
OLT
CYCLE
PHASE
FIGURE 4
NOTE: The Model number of the vending machine is located on the top, left hand corner of the
serial plate. Do Not use the “BASIC UNIT” number. The BASIC number is the cabinet
size, which is used on a number of different machines. A typical model number could read
“786502004”. The 786 is the model number, and the 004 tells what options are included.
G-5
LABEL INSTALLATION
FLAVOR LABELS: Flavor labels are installed from inside the outer door. Open the vendor
door and swing the inner door away, to gain access to the reverse side of the control panel.
Open the coinage door. The flavor labels slide into carrier clips on the back of each flavor
window (Figure 5).
NOTE: Make sure the correct flavor label has been installed for each selection. This vendor
can be programmed to link selection buttons to vend modules in a variety of different
configurations. Refer to the section on electronic-control programming for detail on the vendor
selection set up.
FLAVOR
LABEL
BUTTON ASSY
Figure 5
G-6
COMPRESSOR
DRAIN TUBE
PAN
FAN BRACKET
Figure 6 Figure 7
ALIGNMENT CHECKS
DOOR RAMP CHECK:
The door support is to ensure that the outer door closes squarely to the cabinet. Raising or
lowering the door will help ensure the proper alignment of the door lock stud and the cabinet
latch (see Figure 6).
REFRIGERATION AREA CHECK:
Check the position of the condensation pan (see Figure 7). The correct position of the
condensation pan is between the compressor and the condenser fan bracket. Be sure the
drain tube is clipped to the pan and free of kinks. The trap prevents warm air from reaching
the evaporator area.
G-7
VENDOR TEMPERATURE CONTROL SETTING
The cabinet temperature is regulated by the temperature control, located on the left side of the
evaporator. Before adjusting the control, be sure the refrigeration system is working properly.
Check that the condenser and evaporator fans run freely and do not make excessive noise,
which might indicate an obstruction to the fan blade. The evaporator and condenser grills
should be free from debris. In addition, check the condition of the door gasket, to ensure a
proper seal on the cabinet.
When the air temperature at the feeler bulb reaches 65°F (18°C), the refrigeration system
should cycle on. To lower the cabinet temperature, turn the temperature control adjustment
screw CLOCKWISE. To raise the cabinet temperature, turn the adjustment screw COUNTERCLOCKWISE. The cabinet temperature will change 6 degrees for every 1/4 turn of the
adjustment screw (Figure 8).
To ensure correct temperature control operation, it is essential that the control feeler bulb be
positioned in the air flow from the evaporator, and not resting against any metal surfaces
(other than the retaining clip), which will give a misleading reading to the control. This feeler
bulb should not require adjustment unless the refrigeration system has been removed for
servicing (Figure 9).
C
O
L
D
E
R
CLIP
TEMPERATURE
TEMPERATURE
CONTROL
CONTROL
Figure 8 Figure 9
CAPILLARY
TUBE
G-8
ELECTRO-MECHANICAL FUNCTIONAL DESCRIPTION
VEND MODULE CONFIGURATION AND OPERATION:
The Mars Vendo Confectionery vendor is specially designed to dispense chilled bar-type and
bag-type products, as specified by Mars. The vendor cabinet is divided into two
compartments; the lower portion is open to the ambient environment, and houses the majority
of the refrigeration system components. The remainder of the cabinet is refrigerated to
preserve the vended product.
The vended product, in bar, bag, or combo form, is dispensed from vend modules mounted in
the refrigerated cabinet. There are spaces for up to five vend modules in the cabinet. The use
of five modules however, requires a full 180° swing of the outer door. The modules will always
be one of four varieties:
A) Right-Hand Bar Module
B) Left-Hand Bar Module
C) Bag Module
D) Bag Combo Module
There are two types of bar modules, because of the way these modules are loaded. Bar
product is loaded into only one side of the module as it is pulled out for loading. Therefore, a
right-hand bar module is always installed in the first position at the right side of the cabinet, so
that full access to the module chambers is available. The left-hand bar modules can be
situated in any of the remaining positions in the cabinet.
The bag modules, on the other hand, are loaded from both sides when pulled out for loading.
Therefore, there is only one version of the bag module. Due to the requirement for access to
both sides of the module during loading, these modules can only be installed in the three
center positions.
The Combos module is a right hand module and therefore can only reside in the first position
at the right side of the cabinet.
Each vend module consists of a steel housing with compartments, or columns, segregated by
steel partitions. On bar modules, there will always be four chambers, or columns per module.
On bag modules including Combos modules, however, due to the larger size of bag product,
there are only three chambers, or columns, per module. Each module chamber, or column,
has an access door, full-height, on the column. Bar modules have one door per column; bag
modules have two doors per column--one on either side of the module for each column. The
Combos module has one steel door over all three columns. In each case, these doors keep
the product in place within each column of the module. Each module is hung from a support
channel mounted to the cabinet ceiling, and suspended between a pair of sliding rails, which
allows the module to be pulled forward for loading.
G-9
ELECTRO-MECHANICAL FUNCTIONAL DESCRIPTION (CONTINUED)
The product is stored and dispensed by a motor-driven plastic product helix, except in the case
of the Combos module, where the helix is a powder coated wire helix. The bar-product helix,
bag-product helix, and Combos product helix are different part numbers, as both the diameter
and pitch are different. The helix, in the case of the bar and bag, is driven by the same part
number vend motor. The Combos helix is driven by its own motor that is different from the bag
and bar motors. The vend motors are mounted to a steel support channel at the top of each
module, and are connected by a module harness to the cabinet harness. The vend motors are
connected to the electronic controller in such a way that any combination of vend motors can be
assigned to an individual selection button. This feature allows space-to-sales programming of
the vendor’s column to the selection buttons, to maximize the use of space for prime product
versus slower-moving products.
PRODUCT LOADING:
Check the machine configuration for bar and bag products before loading. All product modules
should have labels indicating exactly which products must be loaded.
Pull each product out such that products can be loaded into the machine. Only one product
module must be loaded at a time. Refer to page G-11.
1) Bar products are loaded from one side of the product module only.
2) Bag products are loaded from each side of the product module, as the module has 2
doors for full access during loading.
No gaps should be left between products. It is essential that ALL spaces are filled.
Ensure that the product module door is closed after loading.
NOTE: Bag product loading
1) Ensure that seam is facing upwards when loaded.
2) Ensure that the product is evenly distributed in the bag.
NOTE: Bar product loading
1) Ensure that seam is facing upwards when loaded.
2) Ensure that the product is evenly distributed in the bar.
G-10
See Page G-11 for details.
THE VEND CYCLE:
In order to initiate a vend, the customer must first set up a credit. A credit is registered by
inserting coins into the coin slot (and into the coin mechanism), by inserting a bill into the bill
validator (if available), or by inserting a debit card into the debit-card reader (if available).
Once a credit is established equal to or in excess of the lowest product price, the customer is
allowed to make a selection. By pressing the selection button of their choice, a signal is sent
to the electronic controller which, in turn, feeds power to the vendor column(s) assigned to that
selection.
Product is vended when a vend motor assigned to that selection is energized by a circuit from
the electronic controller. The motor rotates its product helix, and drops the bottom product out
of the bottom of the helix. The product falls freely onto the product chute.
As the product passes down the product chute, it passes through the vend detection system,
where optical sensors detect the passage of the product on its way to the product hopper. The
passage of product through the vend detection sensors signals the electronic controller, which
then performs a variety of functions. The vended product ends up in the product hopper and is
removed by the customer as they push open the vend door. (See pages PR3 – PR23 for
further electronic controller details.)
G-11
G-12
REFRIGERATION SYSTEM - FUNCTIONAL DESCRIPTION
BASIC REFRIGERATION PRINCIPLES:
A refrigeration system is principally involved in the process of transferring heat. Heat is
removed from the vending product area of the cabinet, and is transferred to the condenser,
where it is dissipated. With vending equipment, large quantities of heat must be transferred
economically and efficiently in a continuous fashion, without loss of refrigeration gas, over a
long period of time. The most common type of refrigeration system in vending is the vapor
compression, or simple compression cycle system. This system consists primarily of three
elements: a compressor, an evaporator, and a condenser, joined together as a “sealed
system”.
In the vapor compression system, there are two pressures present: Low, evaporating
pressure and high, condensing pressure. The refrigerant gas acts as the transport medium in
which heat is transferred from the evaporator to the condenser, where heat is dissipated into
ambient air. A change of state occurs as the refrigerant changes from liquid to vapor and back
to liquid again, allowing the refrigerant to absorb and discharge large quantities of heat in an
efficient manner.
The basic vapor compression cycle occurs as follows: In the evaporator, the refrigerant boils
(evaporates to vapor), at a temperature sufficiently low enough to absorb heat from the cabinet
space being cooled. The pressure maintained in the evaporator controls the boiling
temperature. The higher the pressure, the higher the boiling point. The compressor removes
the vapor via suction lines from the evaporator at a rate sufficiently rapid to help maintain the
desired pressure. The compressor takes the low-pressure vapor and compresses it,
increasing both the pressure and temperature of the vapor. This hot, high-pressure gas is
forced out of the compressor discharge valve and into the condenser. Upon reaching the
condenser, the refrigerant dissipates its heat and condenses into liquid. This liquid, in turn,
flows from the condenser back to the evaporator to repeat the cycle.
VENDO REFRIGERATION SYSTEM OPERATION:
The general cycle described above occurs within the refrigeration system fitted in Vendo
equipment. A more detail explanation of the function of the various components in the system
follows.
As the temperature within the cabinet increases, the liquid contained in the temperature-control
feeler bulb also rises in temperature, and, in doing so, expands. This expansion increases the
pressure against the temperature control bellows, and actuates the temperature control switch.
This switch directs power to the compressor and condenser fan motor. The compressor pulls
low pressure refrigerant vapor from the evaporator and compresses it, increasing both its
temperature and pressure. This high-temperature/pressure vapor is expelled to the
condenser, where the vapor sheds its excess heat, as drawn off by the airflow created by the
condenser fan through the condenser fins. More specifically, the condenser fan pulls air
through the condenser, removing heat from the refrigerant vapor in the condenser coils.
REFRIGERATION SYSTEM - FUNCTIONAL DESCRIPTION (CONTINUED)
G-13
The cooled gas in the condenser turns to liquid, which is pumped via pressure from the
compressor through the drier, which removes any water and particles from the liquid
refrigerant. This liquid is then forced through the small-diameter capillary tube, which acts like
a throttle for the system, controlling the flow rate of the liquid refrigerant into the evaporator.
Airflow is circulated throughout the cabinet by the evaporator fan, which pulls airflow through
the coils and fins of the evaporator. Any excess heat present in the airflow is drawn off by the
liquid refrigerant, which evaporates, and is, in turn, pulled via the compressor. The falling
temperature in the cabinet eventually cools the liquid in the temperature control feeler bulb,
condensing the liquid inside, reducing its pressure, which releases the pressure against the
temperature control bellows. This reduction deactuates the switch inside, cutting off power to
the compressor and condenser fan motor.
HEATING SYSTEM - FUNCTIONAL DESCRIPTION
VENDO HEATING SYSTEM OPERATION:
This vendor is also equipped with a heating element for cold weather environments. This
system consists of a simple 150W, 230V or 115V heating element located just behind the
evaporator fan air ducting. This unit is controlled by its own thermostat and is activated when
temperatures are in danger of freezing the product.
HEATING ELEMENT CAN CAUSE
MINOR BURNS TO YOUR HANDS AND
FINGERS IF TOUCHED WHEN
ELEMENT HAS BEEN ENERGIZED FOR
ANY LENGTH OF TIME.
G-14
VENDOR ELECTRONIC CONTROLLER
DESCRIPTION:
The Mars Vendo Confectionery machine comes equipped with an integral electronic-control
system, which manages the vendor’s mechanical functions, monitors the vend system for
failures, controls the vendor’s coin mechanism, drives the vendor’s scrolling display, and keeps
track of sales data, among other functions. The control systems consist of the following major
components:
• Electronic Control PC Board
• Harnessing
• Scrolling Display
• Transformer
• Reset Switch
• Vend Detection System
• Coin Mechanism
These components work together to jointly control the vendor’s functions. The control system
is programmed with the following capabilities:
• Space-to-Sales Programming
• Sales Data Storage
• Data Retrieval via DEX/UCS Plug or Optical Datalink
• Self-Diagnostics for the Vend Mechanism
• Multi-Pricing
• Multi-Vend
• Multi-Lingual and Personal-Message Display Programming
In order to begin programming the electronic controller, it is necessary to understand the
purpose and location of each of the major components listed above.
Electronic Control PC Board: Located on the outer door, inside a protective housing, the
electronic controller is the heart of the vendor control system. This board contains all the
microprocessors, memory microchip, and other electronic devices needed to control the
functions of the vendor. Also located on the PC board is a small push-button switch, the mode
switch, whose purpose is explained in the electronic controller programming section that
follows. This switch is accessible through a grommeted hole in the electronic controller
housing cover.
Harnessing: Connected to the electronic control PC board are a series of harnesses that
supply power to the control board, and distribute power to the various systems within the
vendor. The harnesses are all keyed in such a way that they cannot be installed on the wrong
set of pins, or misconnected on their correct PC board pins (refer to the Electrical Servicing
section for harness connection detail).
G-15
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