Ice-O-Matic GEMD270A2 Manual

GEMD270A2 PEARL-ICE ICE/WATER DISPENSER
MODELS- GEMD270A2
Installation and Service Manual
Ice-O-Matic
11100 E. 45th Ave.
Part Number
9081407-01 Revision
03/23/21
Denver, Colorado 80239
1-866-PURE-ICE

SERVICE PARTS MANUAL
22 INCH WIDE ICE SERIES CUBERS
MODEL-ICE0320, ICE0520
Includes 50Hz. Units
ICE-O-Matic
11100 East 45th Ave
Denver, Colorado 80239
Part Number 9081297-01 PD04/02 Rev1/05

INTRODUCTION
This manual provides the specifications and the
step-by-step procedures for the installation,
start-up, operation, maintenance and cleaning for
the Ice-O-Matic GEMD270A counter top Pearl
Iceâdispenser.
NOTE: To retain the safety and performance built
into this ice machine, it is important that installation
and maintenance be conducted in the manner
outlined in this manual.
GEMD270A
Page 1
Table of Contents
SPECIFICATIONS ·············································Page 2
CABINET DIAGRAMS ···········································Page 3
GENERAL INFORMATION AND INSTALLATION ·····························Page 4
ELECTRICAL CONNECTIONS ······································Page 5
WATER SUPPLY AND DRAIN CONNECTIONS ·····························Page 6
FINAL CHECK LIST ············································Page 7
OPERATING INSTRUCTIONS ······································Page 8
INITIAL START UP CONTINUED ·····································Page 9
SETTING THE DISPENSING SELECTOR ································Page 11
PRINCIPLE OF OPERATION ·······································Page 12
REFRIGERANT CIRCUIT ·········································Page 13
MECHANICAL SYSTEM ··········································Page 14
COMPONENT DESCRIPTION ······································Page 15
COMPONENT DESCRIPTION ······································Page 16
COMPONENT DESCRIPTION ······································Page 17
COMPONENT DESCRIPTION ······································Page 18
SERVICE DIAGNOSIS ···········································Page 19
SERVICE DIAGNOSIS ··········································Page 20
MAINTENANCE AND CLEANING INSTRUCTION ····························Page 21
CLEANING INSTRUCTIONS OF WATER SYSTEM ···························Page 22
REMOVAL AND REPLACEMENT ·····································Page 23
TOP BEARING REPLACEMENT ·····································Page 24
BEARING REPLACEMENT - CONTINUED ································Page 25
WATER SEAL ···············································Page 26
Ice-O-Matic
11100 East 45th Ave.
Denver CO 80239
800-423-3367

SPECIFICATIONS
GEMD270A:
Ice Maker Dispenser, TouchFree, 200 lb ice making capacity, Pearl Ice â, 12 lb storage
To keep your Ice-O-Matic Pearl Ice âDispenser at peak performance levels, periodic maintenance checks
must be carried out as indicated in this manual.
MACHINE SPECIFICATIONS
GEMD270A
Page 2
Model Cond.
unit
Cabinet Size Finish Comp.
HP
Ice bin
cap
GEMD270A Air 34 13/32” high x 15 9/32” wide x 26 7/64” deep S. Steel 3/8 12 lb.
Basic
electrical
Amps Watts Amps fuse
115/60/1 6 550 15
Unit is equipped with leveling legs.
The unit has a power cord.
Important Operating Requirements:
Min Max
Air Temperature 50oF 100oF
Water Temperature 40oF95
oF
Water Pressure 20 psi 70 psi
Electrical voltage
variations from voltage
rating specified on
nameplate
-10% +10%

CABINET DIAGRAMS
GEMD270A
Page 3

GENERAL INFORMATION AND INSTALLATION
UNPACKING AND INSPECTION
1. Call your authorized Ice-O-Matic Distributor or
Dealer for proper installation.
2. Visually inspect the exterior of the packing and
skid. Any severe damage noted should be reported
to the delivering carrier and a concealed damage
claim form filled in subject to inspection of the
contents with the carrier’s representative present.
3. a) Cut and remove the plastic strip securing the
carton box to the skid.
b) Cut open the top of the carton and remove the
polystyrene protection sheet.
c) Pull out the polystyrene posts from the corners
and then remove the carton.
4. Remove the top and sides panels of the unit and
inspect for any concealed damage. Notify carrier of
your claim for the concealed damage as stated in
step 2 above.
5. Remove all internal support packing and
masking tape.
6. Check that refrigerant lines do not rub against or
touch other lines or surfaces, and that the fan
blades move freely.
7. Check that the compressor fits snugly onto all its
mounting pads.
8. Use clean damp cloth to wipe the surfaces
outside of the cabinet.
9. See data plate on the rear side of the unit and
check that local main voltage corresponds with the
voltage specified on it.
CAUTION: Incorrect voltage supplied to the ice
machine will void your parts replacement program.
10. Remove the manufacturer’s registration card
from the inside of the Users Manual and fill-in all
parts including Model and Serial Number taken
from the data plate. Forward the completed
self-addressed registration card to Ice-O-Matic
factory.
LOCATION AND LEVELING
WARNING: This Ice Dispenser is designed for
indoor installation only. If the machine is operated
for extended periods at temperatures exceeding
the following limitations it will constitute misuse
under the terms of the Ice-O-Matic Manufacturer’s
Limited Warranty resulting in LOSS of warranty
coverage.
Position the unit in the selected permanent
location. Criteria for selection of location include:
Min Max
Air Temperature 50oF 100oF
Water Temperature 40oF95
oF
Water Pressure 20 psi 70 psi
Electrical voltage 103 v 126 v
Service access: adequate space must be left for all
service connections through the rear of the ice
machine.
This machine is air-cooled and sucks air through
the left side panel and blows air out the rear side of
the top panel. Do not install the machine where the
left and upper rear side air flows might be blocked.
A minimum clearance of 6 inches is required at the
left and upper rear side for air circulation.
It is important that the machine be installed in a
location where it has enough space around it to be
accessible for service. Avoid hot, dirty and
crowded locations.
NOTE: Do NOT place anything on top of the
machine. Leave the upper louvers open for
proper air exhaust.
The base of the GEMD270A must be sealed to the
counter top.
1. Place the unit in its final position.
2. Place a bead of sealant on the counter top to
match the outside edge of the cabinet base and
sink.
Food grade silastic sealant is recommended.
GEMD270A
Page 4

ELECTRICAL CONNECTIONS
See data plate for current requirements to
determine wire size to be used for electrical
connections. All Ice-O-Matic ice machines require
a solid earth wire. This Ice-O-Matic ice machine is
supplied from the factory completely pre-wired and
only needs to be plugged into a nearby 115 volt
outlet.
Make sure that the ice machine is connected to its
own circuit and individually fused (see data plate
for fuse size). Not Connected to a G.F.I. outlet
The maximum allowable voltage variation should
not exceed -10% and +10% of the data plate
rating. Low voltage can cause faulty functioning
and may be responsible for serious damage to the
overload switch and motor windings.
NOTE: All external wiring should conform to
national, state and local standards and regulations.
Check voltage on the line and the ice machine’s
data plate before connecting the unit.
GEMD270A
Page 5

WATER SUPPLY AND DRAIN CONNECTIONS
GENERAL
When choosing the water supply for the ice flaker,
consideration should be given to:
a) Length of run
b) Water clarity and purity
c) Adequate water supply pressure
Water is the most important single ingredient in
producing ice - these three items are very
important.
Low water pressure, below 20 psi may cause
malfunction of the ice machine unit.
Water containing excessive minerals will tend to
produce scale build-up on the interior parts of the
water system while water that’s too soft (water
contains too few mineral salts), will produce a very
hard flaked ice.
PLUMBING CONNECTIONS MUST CONFORM
TO ALL APPLICABLE CODES
CONNECT TO POTABLE WATER ONLY
The model GEMD270A is capable of having water
connections through the bottom base or through
the rear bottom side of the machine. In this second
case it is necessary to remove the small panel at
the bottom rear.
WATER SUPPLY
Connect to the ¾" male water inlet fitting, using the
supplied fitting, to the cold water supply line. A
shut-off valve should be installed in an accessible
position between the water supply line and the
unit.
If the water contains a high level of impurities,
consider installing a water filter or conditioner.
WATER DRAIN
The recommended drain tube is a copper, rigid
plastic or reinforced flexible tubing (supplied) with
.75" (19mm) I.D. which runs to an open trapped
and vented drain. When the drain is a long run,
allow1/4" drop per foot.
Note: Although soft, easily kinked vinyl tubing is
not recommended for a drain, a short length of ¾”
ID vinyl tubing is required to connect a rigid drain
tube to the 20 mm (25/32”) fitting on the back of
the GEMD270A.
Install a vertical open vent on the drain line high
point at the drain connection to ensure good
draining.
The ideal drain receptacle is a trapped and vented
floor drain.
NOTE: The water supply and the water drain
must be installed to conform with the local
code. In some case a licensed plumber and/or
a plumbing permit is required.
GEMD270A
Page 6

FINAL CHECK LIST
1. Is the unit in a room where the ambient
temperatures are within a minimum of 50°F even in
winter months?
2. Is there at least a 6" clearance around the unit
for proper air circulation?
3. Is the unit level?
4. Have all the electrical and plumbing connections
been made, and is the water supply shut-off valve
open?
5. Has the voltage been tested and checked
against the data plate rating?
6. Has the water supply pressure been checked to
ensure a flowing water pressure of at least 20 psi.
7. Check all refrigerant lines and conduit lines to
guard against vibrations and possible failure.
8. Has the unit been sealed to the counter top?
9. Has the owner/user been given the Users
Manual and been instructed on the importance of
periodic maintenance checks?
10. Has the Manufacturer’s registration card been
filled in properly? Check the model and serial
number against the serial plate and mail the
registration card to Ice-O-Matic.
11. Has the owner been given the name and the
phone number of the authorized Ice-O-Matic
Service Agency serving them?
GEMD270A
Page 7

OPERATING INSTRUCTIONS
START UP
Afterhavingcorrectlyinstalledtheicemakerand
completed the plumbing and electrical connec-
tions,performthefollowing“Start-up”procedure.
A. Openthewatersupplylineshutoffvalveand
give power by moving the main switch, on the
power supply line, to the ON position.
The GREEN LED will glow to signal that unit is
under power.
NOTE.Everytimetheunitisputunderpower,
after being kept for sometime in shut-off
conditions(electricallydisconnected)the 2nd
RED LED will blink for 3 minutes (Fig.1).
B. Elapsedthe3minutes-standbyperiod-the
unit starts operating with the activation in
sequence of the following assemblies:
GEAR MOTOR
COMPRESSOR
FAN MOTOR kept under control by the
condenser temperature sensor which has its
probe within the condenser fins
with the switching off of the 2nd RED LED
(Fig. 2).
C. 2or3minutesafterthecompressorstartup,
observethatflakericebeginsdroppingofftheice
spout to fall into the storage bin.
NOTE. If, after ten minutes from the
compressor start-up, the evaporating tem-
perature has not dropped down to a value
lower than -1 ° C (30 ° F) the evaporating tem-
perature sensor detects such an abnormal
situation and stops consequently the unit
operation.
Inthiscircustance,the3rdwarningYELLOW
LED will blink (Fig.3).
After having diagnosed and eliminated the
cause of the poor evaporating temperature
(insufficient refrigerant in the system or
inoperativecompressororevaporatorsensor) itis
necessarytopushtheRE-SETBUTTON or De-
engerize and re-engerize unit. Theunit,before
resumingthetotaloperation, willgothroughthe
usual3minutesSTAND-BYperiod.
OPERATION CHECKS UPON THE UNIT
START UP
D. Remove service panels and if necessary
install the refrigerant service gauges on the
corresponding Service valves to check both the
HI and LO refrigerant pressures.
NOTE. The condenser temperature sensor,
which is located within the condenser fins,
keeps the head (condensing) pressure
between two preset valves.
Incaseofcondensercloggingsuchtoprevent
the proper flow of the cooling air or, in case
the fan motor is out of operation, the
condenser temperature rises and when it
reaches70 ° C(160 ° F)thecondensertempe-
raturesensorshuts-offtheicemakerwiththe
consequent light-up of the 2nd RED
WARNING LIGHT (Fig.4).
After having diagnosed the reason of the
temperatureriseandremoveditscause,itis
necessary to proceed as per the previous
“NOTE”tostart up againtheoperationofthe
ice maker.
FIG. 1 BLINKING - FLASHING
3 MINUTES DELAY TIME AT START UP
BLINKING-FLASHING SLOW
INFRARED BEAM CUTTED
WITH MACHINE IN OPERATION
STEADY
MACHINE OFF AT BIN FULL
BLINKING-FLASHING FAST
INFRARED BEAM ON AFTER
THE TRIPPING OFF AT BIN FULL
NO WATER
POWER ON
BLINKING-FLASHING
3 MINUTES DELAY TIME AT START UP
STEADY
TOO HI CONDENSING TEMPERATURE
BLINKING-FLASHING
TOO HI EVAPORATING TEMP.
AFTER 10 MIN. FROM START UP
STEADY
WRONG-NO-SLOW ROTATION
GEAR MOTOR FIG. 2
FIG. 3 BLINKING - FLASHING
TOO HI EVAPORATING TEMP. AFTER 10 MIN.
FROM START UP
GEMD270A
Page 8

E. Check for the correct CUT-OUT and
CUT-IN of the float reservoir water level sen-
sors by shutoff the valve on the water supply
line.
This will cause a gradual decrease of the water
level in the float reservoir and as soon as the
level gets below the sensors, the flaker stops to
operate and the 5thYELLOW warning LED will
glow to signal the shortage of water (Fig.5).
NOTE. The water level sensor detects the
presence of sufficient water in the float
reservoir and confirms it to the micro
processor by maintaining a low voltage
current flow between the two sensors using
the water as conductor.
WARNING. The use of de-mineralized
water (water with no salt content) having
an electrical conductivity lower than 30
µS, will cause the ability of the water
sensors to vanish with the consequent
CUT-OUToftheflakeroperationsandthe
glowing of the YELLOW LED of shortage
ofwater,eventhoughthatwaterisindeed
in the reservoir.
After this, open the water supply line shutoff
valve to fill up again the float reservoir, the 5th
YELLOW LED goes off while the 2nd RED LED
starts blinking.
After3minutestheunitresumesitstotaloperation
with the immediate start-up of the gear motor
and, 2 seconds later, of the compressor.
F. Check for the correct operation of the
electronic eye for the ice bin level control, by
placing one hand between the sensing “eyes”
located in the ice spout, to interrupt the light
beam.
Thisinterruptionwillcauseanimmediateblinkof
the6th YELLOWLEDandafterabout6seconds
causes the shutoff of the unit with the simulta-
neous lighting of the same YELLOW LED
signalling the full bin situation (Fig.6).
Allowtheresumptionofthelightbeampreviously
interrupted and after about 6 seconds with
YELLOWLEDblinkingfast,theflakerwillresume
- through the 3 minutes STAND-BY period - the
ice making process with the extinguishing of the
YELLOW LED.
NOTE.TheICELEVELCONTROL(INFRA-
REDSYSTEM)isindependentofthetempe-
rature however, the reliability of its detection
canbeaffectedbydirtandscalesediment
whichmaydepositdirectlyonthelightsource
and on the receiver.
To prevent any possible ice maker
malfunction, due to negative affection of the
light detector, it is advisable to follow the
instructions for the periodical cleaning of
the light sensor elementsasdetailedin the
MAINTENANCE AND CLEANING PRO-
CEDURES.
FIG. 4
STEADY
TOO HI CONDENSING TEMPERATURE
FIG. 5 NO WATER
FIG. 6
BLINKING - FLASHING SLOW
INFRARED BEAM CUTTED WITH MACHINE IN OPERATION
STEADY
MACHINE OFF AT BIN FULL
BLINKING - FLASHING FAST
INFRARED BEAM ON AFTER THE TRIPPING OFF AT BIN FULL
GEMD270A
Page 9
OPERATING INSTRUCTIONS

WATER CIRCUIT
The water entersin the machine through
the water inlet fitting (which incorporates a
strainer and it is located at the rear side of the
cabinet) and then it goes to the water
reservoir flowing through a float valve.
NOTE.Thepresenceofthewaterinthefloat
reservoir is detected by a system of two
sensors which operates in conjunction with
the P.C. Board. The two sensors use the
waterasaconductortomaintainalowvoltage
currentflowbetween them.Incasethewater
used is very soft (de-mineralized) or the
reservoir is emptythecurrentflowbetween
thesensors become soweak orisno longer
there that, as consequence, the P.C.
Board shutoff the flaker operation with the
simultaneous glowing of the YELLOW LED
signalling “Shortage of water”.
Thefloatreservoirispositionedatthesideofthe
freezing cylinder at such a height to be able to
maintainaconstantwaterlevelaroundthefreezer
auger. In fact, the water flows from the reservoir
into the bottom inlet of the freezing cylinder to
sorround the stainless steel auger which is
vertically fitted in the center of the freezer.
Inthefreezertheincomingwatergetschilledinto
soft (slush) ice which is moved upward by the
rotating action of the auger. The stainless steel
auger that rotates counter-clockwise within the
freezer, is powered by a direct drive gear motor
andcarriestheiceupwardalongtherefrigerated
freezer inner walls and by doing so the ice gets
progressively thicker and harder.
The ice, being costantly lifted up, meet the tooth
oftheicebreakerwhichisfittedonthetopendof
theauger,whereitgetscompacted,crackedand
forced to change from vertical into horizontal
motion to be discharged out, through the ice
spout, into the storage bin.
By running the ice maker, i.e. by putting the unit
underpower,startstheautomaticandcontinuous
icemakingprocesswhichwouldnotstopuntilthe
ice storage bin gets filled-up to the level of the
control “eyes” located on the sides of the ice
spout.As the icelevelraisesto interrupt thelight
beam running between the two infrared lamps,
the unit stops after six seconds, with the
simulteneous glowing of the YELLOW LED
signalling the “Full Bin” situation.
NOTE. The interruption of the light beam
betweenthetwolightsensorsisimmediately
signalledbythe blinkingofthe 6th YELLOW
LED located on the front of the P.C. Board.
After about 6" of steady interruption of the
light beam the unit stops and the “Full Bin”
YELLOW LED glows.
The six seconds of delay prevent the unit
from stopping for any undue reason like the
momentarily interruption of the light beam
causedbytheflakesthatslidesalong theice
spout before dropping into the bin.
As some ice is dispensed from the storage bin,
thelightbeambetweenthetwosensorsresumes
and immediately the 6th YELLOW LED blinks
fast; six seconds later the ice machine restarts
the ice making process and the YELLOW LED
goes off.
REFRIGERANT CIRCUIT
The hot gas refrigerant discharged out from the
compressorreachesthecondenserwhere,being
cooled down, condenses into liquid.
Flowing into the liquid line it passes through the
drier filter, then it goes all the way through the
capillarytubewhereitloosessomeofitspressure
sothatitspressureandtemperaturearelowered.
Next, the refrigerant enters into the evaporator
coil wrapped around the freezer inner tube.
The water being constantly fed at the interior of
the freezer inner tube, exchange heat with the
refrigerant circulating into the evaporator coil,
thiscausetherefrigeranttoboil-offandevapora-
te, thereby it changes from liquid into vapor.
The vapor refrigerant then passes through the
suctionaccumulatorandthroughthesuctionline
where the refrigerant exchanges heat with the
oneflowingintothecapillarytube(warmer)before
being sucked into the compressor to be
recirculated.
The refrigerant heat pressure is kept between
two pre-set values 9÷10 bar -125÷140 psig by
thecondensertemperaturesensor which has its
probe located within the condenser fins - in air
cooled versions.
This condenser temperature sensor, when
senses a rising of the condenser temperature
beyond the pre-fixed limit, changes its electrical
resistance and sendsa low voltage power flow
to the MICRO-PROCESSOR of the P.C.
Board which energizes, through a TRIAC,
the Fan Motor in ON-OFF mode.
FREEZER
FLOAT TANK
FLOAT VALVE
WATER INLET LINE
ICE SPOUT
FREEZER
WATER
FEED LINE
PRINCIPLE OF OPERATION
GEMD270A
Page 10

When the opposite situation occures, i.e. the
condensertemperaturegetsbelowthepre-fixed
limit, the temperature sensor changes again its
electrical resistance reducing therefore the
currentflowtotheP.C.Boardtocauseatempo-
rary stop of the Fan Motor.
NOTE. In case the condenser temperature
probesensesthatthecondensertemperatu-
re has rised to 70 ° C (160 ° F) for one of the
following abnormal reasons:
CLOGGED CONDENSER
FAN MOTOR OUT OF OPERATION
AMBIENTTEMPERATUREHIGHERTHEN
43 ° C (110 ° F)
it causes the total and immediate SHUT-
OFF of the machine in order to prevent the
unit from operating in abnormal and
dangerous conditions. When the ice maker
stops on account of this protective device,
there is a simultaneous glowing of the 2nd
RED LED, warning the user of the Hi Tem-
perature situation. After having eliminated
the source of the excessive condenser tem-
perature, to restart the ice machine it is
necessary to push the RE-SET button or
De-engerize and Re-engerize the unit.
The 2nd RED LED starts blinking and
three minutes later the flaker unit resume its
normal operating mode.
The refrigerant suction or Low-pressure sets in
normalambientconditions(21°C/70°F)-onthe
value of1 bar (14psig) afterfewminutesfrom
theunit start-up.
Thisvalue can vary of 0.1 or 0.2 bar (1.5 ÷ 3 psig)
in relation to the water temperture variations
influencing the freezer cylinder.
NOTE.If,aftertenminutesfromtheunitstart
up, no ice is made and the evaporating
temperature detected by the evaporator
sensor is higher than -1 ° C (30 ° F) theice
makerstopsandthe 3RDWARNING
YELLOW LED blinks.
MECHANICAL SYSTEM
The mechanical systemrconsistsbasicallyofa
gear motor assembly which drives, through a
ratched coupling, a worn shaft or auger
placed on its vertical axis within the freezing
cylinder.
Thegearmotorismadeofasinglephaseelectric
motor with a permanent capacitor. This motor is
directly fitted in the gear case through which it
drives - in counter clockwise rotation at a speed
of 9.5 r.p.m. - the freezer auger being linked to it
by the ratched coupling.
NOTE. In the event the gear motor will tend
to rotate in the wrong direction or not
rotating at all the unit will stop
immediately with the glowing of the 3RD
WARNING YELLOW LED on account of
the intervention of the Electromagnetic
SafetyDevice -basedonHallEffectprinciple.
After having diagnosed and eliminated the
source of the failure, to restart the unit it is
necessary to press the RE-SET push button
or switch OFF and ON the power line main
disconnnect switch (Fig. 7).
The RED LED will start blinking and after
3 minutes the ice maker will resume its total
operations by running first the gear motor
and then the compressor.
When the gear motor rotating speed is slowed
below 1300 r.p.m. from the normal speed of
1400 r.p.m. the Electromagnetic Safety Device
transmits an electrical signal to the
MICROPROCESSOR to stop immediately the
unit operations like it occures for the wrong
rotation,withthelighting-upofthe3RDYELLOW
WARNING LED. This to relieve from the
excessive load all the electrical and mechanical
componentsoftheentireDriveSystemandextend
their durability.
NOTE.Afterhavingdiagnosedandeliminated
the source of the gear motor slow rotation to
restart the unit it is necessary to press the
RE-SET push button or switch OFF and ON
the power line main switch.
NOTE. Any time the machine stops in alarm
the front four LED's start to blink.
ACCUMULATOR
CAPILLARY TUBE
COMPRESSOR
DISCHARGE LINE
CONDENSER
SUCTION LINE
FAN MOTOR
EVAPORATOR
FIG. 7 STEADY
WRONG-NO-SLOW ROTATION GEAR MOTOR
GEMD270A
Page 11
PRINCIPLE OF OPERATION

REFRIGERANT METERING DEVICE:
capillary tube
OPERATING PRESSURES
(With 21°C/70°F ambient
temperature)
D ischarge pressure: 9 ÷10 bar (125 ÷140 psig)
Suction pressure: 1 bar (14 psig)
REFRIGERANT CHARGE (R 134 A): 370 gr
NOTE.Beforechargingtherefrigerantsystem
always check the type of refrigerant and
quantity as specified on the individual ice
machine dataplate.
Therefrigerantchargesindicatedarerelatives
to averages operating conditions.
GEMD270A
Page 12
PRINCIPLE OF OPERATION

A. EVAPORATOR TEMPERATURE
SENSOR-BLACK2POLESCONNECTOR
- MANUAL RESET (see **NOTE)
The evaporator sensor probe is inserted into its
tube well, which is welded on the evaporator
outlet line. It detects the temperature of the
refrigerant on the way out from the evaporator
and signals it by suppying a low voltage current
flow to the P.C. Board Micro-Processor.
According to the current received, the micro-
processor let the ice maker to continue its
operations or not. In case the evaporating tem-
perature,after 10 minutes from the unitstart-up,
does not go below -1°C (30°F) the evaporator
sensor signal reaching the microprocessor is
suchto stopimmediatelytheunitoperation, with
the 3rd Warning YELLOW LED that blinks.
B. WATER LEVEL SENSOR - RED TWO
POLES CONNECTOR - AUTOMATIC
RESET
Thissensorsystemconsistoftwosmallstainless
steelrodsvertically fitted on theinnerfaceofthe
reservoircoverand electrically connected to the
low voltage circuit of the P.C. Board. When the
coverofthereservoirispositionedinitsplacethe
tips of both the rods dip into the reservoir water
and detects and signals its presence by supply
power back to the P.C. Board.
NOTE. In the event of shortage of water in
thereservoiror,incasethewaterusedistoo
soft (de-mineralized) to cause greater
resistence to the current flow (conductivity
lowerthan30 µ S)thissensorsystemcauses
theshutoffofthemachine,toprotectitfrom
running with an interrupted or inadequate
water supply.
In this situation the 5th YELLOW LED will
glow to warn of the machine shutoff and the
reason why.
C. CONDENSER TEMPERATURE SENSOR
- WHITE TWO POLES CONNECTOR
-MANUAL RESET (see **NOTE)
The condenser temperature sensor probe,
located within the condenser fins detects the
condenser temperature variations and signals
them by supplying current, at low voltage, to the
P.C. BOARD.
In relation to the different current received, the
micro processor of the P.C. BOARD supplies,
throughaTRIAC,thepowerathighvoltagetothe
fan motor so that it can cool the condenser and
reduce its temperature.
In the event the condenser temperature rises
and reaches 70°C/158°F the current arriving
to the micro processor is such to cause an
immediate and total stop of the machine
operation with the glowing of the 2nd RED
WARNING LED.
** NOTE. To restart the unit after the
shutoff it is necessary to push the RE-
SET button (after having remedied to the
causes of unit stoppage) or to switch OFF
and ON the
power line main disconnect Switch.
D. GEAR MOTOR ROTATION AND SPEED
SENSOR - RED FOUR POLES CONNECTOR
- MANUAL RESET (see **NOTE)
This safety device is housed on top of the Drive
Motoranddetects-basedonHallEffectprinciple
- the rotating speed and rotating direction of the
drive Motor.
Should the rotating speed drop below
1300 r.p.m. the magnitude measured by this
device is such to signal to the microprocessor to
stop the unit and light-up the 3rd YELLOW LED.
Thesamereactionoccureswhenthedrivemotor
will tend to rotate in the wrong direction
or it doesn't rotate at all.
NOTE. To restart the unit after the shutoff
caused by this safety device, it is necessary
firsttoeliminatethecausethathasgenerated
theinterventionofthedeviceandthenpress
the RE-SET push button or switch OFF and
ON the power line main disconnect switch.
FIG. 8 BLINKING - FLASHING TOGETHER
EVAPORATOR SENSOR OUT OF ORDER
FIG. 9 STEADY TOGETHER
CONDENSER SENSOR OUT OF ORDER
GEMD270A
Page 13
COMPONENT DESCRIPTION

E. ICEBINLEVELLIGHTCONTROL-BLACK
FOUR POLES CONNECTOR -
AUTOMATIC RESET
The electronic ice bin level control, located into
theicespout,hasthefunctiontostoptheoperation
of the ice machine when the light beam between
the light source and the sensor gets interrupted
by the flake ice which accumulates in the spout.
When the light beam is interrupted the 6th
YELLOW LED located in the front of the P.C.
BOARD blinks; in case the light beam gets
interrupted for as long as 6 seconds, the ice
machine stops with the glowing-up of the same
YELLOWLEDtomonitorthefullicebinsituation.
The6secondsofdelaypreventsthatanyminimum
interruption of the light beam due to the regular
ice chuting through the ice spout may stop the
operation of the unit.
As soon as the ice is dispensed out (with the
resumption of the light beam between the two
infraredsensoroficelevelcontrol)theYELLOW
LED blinks fast and after 6 seconds the ice
machine resume its operation with the
simultaneous extinguishing the YELLOW LED.
F. ICE/WATER OPTICAL DISPENSING
DEVICE - BLUE FOUR POLES CONNECTOR
Located on the front of the dispensing area it
consists of the combination of an infrared
Transmitter and Receiver.
When a glass or a carafe is placed in front of the
Infrared sources, the optical device transmits a
signal to the PC Board that is equivalent to
activate the dispensing drive motor which, in
turn,putinrotationadispensingvanethatpushes
the ice towards a rectangular opening located in
the bottom of the storage bin.
Elapsedthedispensingtime(5,10or15seconds
according to the setting) or after removing the
glass/carafe, the infrared resume its original
conditionswitchingoffthedispensingdrivemotor.
H. P.C. BOARD (Data processor)
The P.C. BOARD, fitted in its plastic box located
inthe rightsideoftheunit,consistsoftwoseparated
printed circuits one at high and the other at low
voltage, protected by three fuses, integrated with
a RE-SET button. Also it consists of six aligned
LEDS monitoring the operation of the machine
and ofinput terminals for the leads of the sensor
probes as well as input and output terminals for
the leads of the ice maker electrical wires. The
P.C. BOARD is the brain of the system and it
elaborates, through its micro processor, the
signals received from the sensors in order to
control the operation of the different electrical
componentsof the ice maker (compressor, gear
motor, etc.) as well as the dispensing of the ice
and water.
Ref. to FIG. 10 the six LEDS from left
to right:
2nd RED LED ON :
Unit shut-off due to a too hi-
condensing temperature > 70°C/158°F
2nd RED LED BLINKING:
3 minutes start up delay time
3rd YELLOW LED ON:
Unit shut-off due to the wrong rotation direction
of gear motor or due to the too low speed of
gear motor
3rd YELLOW LED BLINKING: Unit
shut-off due to high evap. temp > -1°C/30°F
after 10 min of operation
FIG. 12 BLINKING - FLASHING ALTERNATE
OPTICAL ICE LEVEL CONTROL OUT OF ORDER
GEMD270A
Page 14
COMPONENT DESCRIPTION
**FIG 12. If Ice Level Sensor is out of order:
Blinking Alternate between 2nd Red & 3rd
Yellow lights.**

Page 15
4th GREEN LED ON:
- Unit under electrical power
5th YELLOW LED ON:
-low water reservoir level or low/no
conductivity
6th YELLOW LED ON
- Unit shut-off at storage bin full
Blinking slow
-Infraredbeamcuttedwithmachineinoperation
Blinking fast
-Infrared beam ONaftertripping OFF atstorage
bin full
BOTH RED LEDS STEADY (Fig. 11)
- Condenser sensor Out of Order
YELLOW AND RED BLINKING TOGETHER - (Fig. 11)
Evaporator sensaor Out of Order
YELLOW AND RED BLINKING ALTERNATE- (Fig. 11)
Optical Ice Level Control Out of Order
CALIBRATION OF ICE LEVEL
CONTROL/PC BOARD
Any time the PC Board and/or the Ice Level
Controlarereplaceditnecessarytopereformthe
calibration as per following instructions:
• Switch OFF the machine
• Push and hold the PC Board push button
• Switch ON the machine keepiung pushed the
PC Board push button till all LEDs are ON
• Release the push button
ALL STEADY
CALIBRATION OF PC BOARD &
OPTICAL ICE LEVEL CONTROL
BLINKING-FLASHING SLOW
INFRARED BEAM CUTTED
WITH MACHINE IN OPERATION
STEADY
MACHINE OFF AT BIN FULL
BLINKING-FLASHING FAST
INFRARED BEAM ON AFTER
THE TRIPPING OFF AT BIN FULL
NO WATER
POWER ON
BLINKING-FLASHING
3 MINUTES DELAY TIME AT START UP
STEADY
TOO HI CONDENSING TEMPERATURE
BLINKING-FLASHING
TOO HI EVAPORATING TEMP.
AFTER 10 MIN. FROM START UP
STEADY
WRONG-NO-SLOW ROTATION
GEAR MOTOR
BLINKING - FLASHING
TOGETHER
EVAPORATOR SENSOR OUT
OF ORDER
BLINKING - FLASHING
ALTERNATE
OPTICAL ICE LEVEL
CONTROL OUT OF ORDER
STEADY
CONDENSER SERNSOR OUT OF
ORDER
GEMD270A
Page 15
COMPONENT DESCRIPTION
FIG. 10
FIG. 11
(Fig. 11)

I. FLOAT RESERVOIR
Thefloatreservoirconsistsofaplasticwaterpan
on which is fitted a float valve with its setting
screw. The float valve modulate the incoming
water flow to maintain a constant water level in
thereservoir,levelthatcorrespondstotheonein
the freezing cylinder to ensure proper ice
formation and fluidity.
Onthe innersideofthereservoir coverarefitted
the two water level sensors which detects the
presenceortheshortageofwaterinthereservoir.
NOTE. It is very important to make sure of
thecorrectfittingofthecoveronthereservoir
in order to enable the sensor to efficiently
control the water situation avoiding undue
shutoff interventions.
J. FREEZING CYLINDER (EVAPORATOR)
Thefreezingcylinderismadeofastainlesssteel
verticaltubeonwhichexterioriswrappedaround
the cooling coil with the evaporating chamber
and in its interior is located the auger which
rotates on its vertical axis and it is maintained
alignedby the top and bottombearings. Awater
seal system is located in the bottom part of the
freezer while at the top end is fitted the ice
breaker.
The water constantly flowing into the cylinder
bottompart,freezesintoicewhenincontactwith
the cylinder inner walls. The ice is then lifted up
bytherotatingauger andcompactedandforced
out by the ice breaker.
K. ICE BREAKER
The ice breaker is made by several rectangular
openingswheretheiceisforcedtopassthrough.
By undergoing this, the ice looses its excess of
water content so it drops into the bin in hard dry
bits of ice.
In the ice breaker it is housed the top bearing
whichismadeoftworollbearingspositionedto
withstand the auger axial and radial loads. This
bearing is lubricated with a food grade - water
resistant grease.
NOTE.Itisadvisabletochecktheconditions
ofboththelubricantgreaseandthebearings
every six months.
L. DRIVE GEAR MOTOR
This motoreducer is made of a single phase
electric motor with permanent capacitor directly
fitted on a gear box.
The drive motor rotor is kept aligned on its
vertical axis by two ball bearings permanently
lubricated. The gear case contains a train of
three spur gears the first one of which is in fiber
to limit the noise level. All the three gears are
encased in case bearings and are covered by
lubricant grease (MOBILPLEX IP 44).
Two seal rings, one fitted on the rotor shaft and
the other on the output shaft keep the gear case
sealed.
Hovewer, the interior can be inspected and
serviced by unbolting the two halves of the
aluminium gear case housing.
Thegearreduceroutputshaftisconnectedtothe
freezer auger by a ratched coupling which is
made of two toothed halves that engages
themselves only if turned in the correct direction
namely, conterclockwise.
M. FAN MOTOR (Air cooled version)
The fan motor is controlled through the P.C.
BOARDandtheTRIACbythecondensertempe-
raturesensor.Normallyitoperatestodrawcooling
air through the condenser fins.
Incoldambientsituation,thefanmotorcanrunat
intermittanceasthecondenserpressuremustbe
kept between two corresponding head pressure
values.
N. COMPRESSOR
The hermetic compressor is the heart of the
refrigerant system and it is used to circulate and
retrieve the refrigerant throughout the entire
system.Itcompressesthelowpressurerefrigerant
vaporcausingitstemperaturetoriseandbecome
high pressure hot vapor which is then released
through the discharge valve.
O. ICE DISPENSER DRIVE MOTOR
Located on the upper side of the storage bin, it
turnbyamilledshaftthedispensingvaneplaced
inside the round storage bin.
By rotating, the dispensing vane pushes the ice
towards the bottom rectangular opening so to
force the nugget ice to go through the bottom
outlet spout.
P. STORAGE BIN
Round shaped it is located in the front of the ice
machine and has the main reason to store the
nugget ice produced by the evaporator until
it reaches its maximum level controlled by
an infraredopticalsystem.Initsbottomisplaced
the ice spout as well as the water drain hole.
Inside the ice spout opening is also located the
water outlet tube connected to the solenoid val-
ve.
Q. DISPENSINGWATERSOLENOIDVALVE
Energized and controlled by the PC Board, it
allows a metered quantity of not chilled water to
be dispensed through the same opening of the
ice.
GEMD270A
Page 16
COMPONENT DESCRIPTION

SETTING THE DISPENSING SELECTOR
Setting the dispensing time
It’s possible to modify the dispensing time to 5, 10,
3 or 1.5 seconds. To modify the original setting
time (5 seconds):
a) Push and hold the 4th switch (CONTINUOUS)
for 10 seconds until the first 3 lights start to blink,
b) Push & release the 1st switch (ICE) for a 1.5
second dispense.
c) Push & release the 2nd switch (ICE AND
WATER) for a 3 second dispense.
d) Push & release the 3rd switch (WATER) for a 1.5
second dispense.
The unit resumes a default dispense setting (Ice,
Ice and Water or Water) after each dispense.
To modify the resume mode (from factory set to
ICE) push the desired switch (ICE, ICE AND
WATER or WATER ) for 5 seconds.
H. CHECK OF THE DISPENSING OPERATING
MECHANISM
To check for the correct operation of the
dispensing mechanism:
a) First, select the Dispensing Mode by pushing
the proper membrane button.
b) Place a glass or a carafe in front of the two
Optical Dispensing Devices.
c) The dispensing drive motor and/or the water
solenoid valve starts. Ice and/or water is
discharged through the bottom plastic spout.
The drive motor and/or the water solenoid valve
remains in operation (per dispensing time settings)
unless the glass or carafe is removed.
Push the CONTINUOUS switch and check again
for the dispensing mechanism operation per the
steps above.
The drive motor and/or the water solenoid valve
will remain in operation until the glass or carafe is
removed.
I. If connected, remove the refrigerant service
gauges and re-attach the service panels.
J. Instruct the owner/user on the general operation
of the ice machine and its required cleaning and
care.
GEMD270A
Page 17
Note: If all the dispensing
selector lights are blinking, the
main control board (on the
right side of the unit) has
sensed a problem with the
machine's operation. Check
the main board's diagnostic
lights for further information.
r

SERVICE DIAGNOSIS
SYMPTOM POSSIBLE CAUSE SUGGESTED CORRECTION
Unit will not run Blown fuse in P.C. Board Replace fuse & check for cause of blown fuse
No LED lights Master switch in OFF position Turn switch to ON position
Inoperative P.C. Board Replace P.C. Board
Loose electrical connections Check wiring
6th Yellow LED glows Inoperative or dirty ice level
control
Replace or clean ice level control
5th Yellow LED glows Shortage or too soft water See remedies for shortage of water or install a mineral salt
metering device
2nd LED glows High head pressure Dirty condenser. Clean
Inoperative fan motor. Replace
3rd Yellow LED blinks Too high evap. temperature Check and charge refrigerant system
Shortage or lack of refrigerant
3rd Yellow LED glows Gear motor tends to run on
reverse
Check gear motor capacitor
Too low gear motor rotating
speed
Check rotor bearings, freezer bearings and interior of
freezer for scores. Replace whatever is worn or damaged.
No rotation of gear motor Check for power to drive motor (16 A fuses)
Check for stator winding
Gear motor starts and stops Check for correct operation of drive after a while motor
magnetic sensor
Check for correct magnetic capacity of magnetic
cylinder
Compressor cycles
intermittently
Low voltage Check circuit for overloading
Check voltage at the supply to the building. If low,
contact the power company
Non-condensable gas in system Purge the system
Compressor starting device with
loose wires
Check for loose wires in starting device
Low ice production Capillary tube partially restricted Blow charge, add new gas & drier, after evacuating
system with vacuum pump
Moisture in the system Same as above
Low water level in the freezer Adjust to approx 20mm below ice spout
Shortage of refrigerant Check for leaks & recharge
Pitted or stained auger surface Clean or replace auger
Will not dispense Dispense motor open Check windings
No power to dispense motor Check harness connections from touch free sensors
to control board & from board to motor
Control board does not work Trace harness from touch free sensors to PC board,
jump the two center pins, the dispense motor should
turn. If not replace the board
Open harness Check the harness for continuity, if any wire is open,
replace the harness
Defective sensor If the above does not prove to be a problem,
replace the sensors
GEMD270A
Page 18
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