Page 1
Service Manual
GEMU090 Series
Ice-O-Matic
11100 East 45th Ave
Denver, Colorado 80239
Part Number 9081430-02 Date 9/11
Page 2
Ice-O-Matic
Parts and Labor
Domestic & International Limited Warranty
Mile High Equipment LLC (the “Company”) warrants Ice-O-Matic brand ice machines, ice dispensers, remote condensers, water filters, and ice storage
bins to the end customer against defects in material and factory workmanship for the following:
Cube ice machines, compressed ice machines and remote
condensers. - Thirty-six (36) months parts and labor
Flake ice machines, GEMD Maker Dispensers, and GEMU
Undercounter compressed ice machines - Twenty-four (24)
months parts and labor
CD model dispensers - Thirty-six (36) months parts and
labor
An additional twenty-four (24) month warranty on parts (excluding labor) will be extended to all cube ice machine evaporator plates and all cube ice and
compressed ice machines, except GEMU machines, compressors from the date of original installation. An additional thirty-six (36) month warranty on
parts (excluding labor) will be extended to all flake ice machine and GEMD maker dispenser compressors from the date of original installation The
company will replace EXW (Incoterms 2000) the Company plant or, EXW (Incoterms 2000) the Company-authorized distributor, without cost to the
Customer, that part of any such machine that becomes defective. In the event that the Warranty Registration Card indicating the installation date has
not been returned to Ice-O-Matic, the warranty period will begin on the date of shipment from the Company. Irrespective of the actual installation date,
the product will be warranted for a maximum of seventy-two (72) months from date of shipment from the Company.
ICE-model cube ice machines which are registered in the Water Filter Extended Warranty Program will receive a total of eighty-four (84) months parts
and labor coverage on the evaporator plate from the date of original installation. Water filters must be installed at the time of installation and registered
with the Company at that time. Water filter cartridges must be changed every six (6) months and that change reported to the Company to maintain the
extended evaporator warranty.
No replacement will be made for any part or assembly which (I) has been subject to an alteration or accident; (II) was used in any way which, in the
Company’s opinion, adversely affects the machine’s performance; (III) is from a machine on which the serial number has been altered or removed; or,
(IV) uses any replacement part not authorized by the Company. This warranty does not apply to destruction or damage caused by unauthorized service,
using other than Ice-O-Matic authorized replacements, risks of transportation, damage resulting from adverse environmental or water conditions,
accidents, misuse, abuse, improper drainage, interruption in the electrical or water supply, charges related to the replacement of non-defective parts or
components, damage by fire, flood, or acts of God.
This warranty is valid only when installation, service, and preventive maintenance are performed by a Company-authorized distributor, a Compa nyauthorized service agency, or a Company Regional Manager. The Company reserves the right to refuse claims made for ice machines or bins used in
more than one location This Limited Warranty does not cover ice bills, normal maintenance, after-install adjustments, and cleaning.
Limitation of Warranty
This warranty is valid only for products produced and shipped from the Company after March 1, 2010. A product produced or installed before that date
shall be covered by the Limited Warranty in effect at the date of its shipment. The liability of the Company for breach of this warranty shall, in any case,
be limited to the cost of a new part to replace any part, which proves to be defective. The Company makes no representations or warranties of any
character as to accessories or auxiliary equipment not manufactured by the Company. REPAIR OR REPLACEMENT AS PROVIDED UNDER THIS
WARRANTY IS THE EXCLUSIVE REMEDY OF THE CUSTOMER. MILE HIGH EQUIPMENT SHALL NOT BE LIABLE FOR ANY INCIDENTAL OR
CONSEQUENTIAL DAMAGES FOR BREACH OF ANY EXPRESS OR IMPLIED WARRANTY ON THIS PRODUCT. EXCEPT TO THE EXTENT
PROHIBITED BY APPLICABLE LAW, ANY IMPLIED WARRANTY OR MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ON
THIS PRODUCT IS LIMITED IN DURATION TO THE LENGTH OF THIS WARRANTY.
Filing a Claim
All claims for reimbursement must be received at the factory within 60 da ys from date of service
time period will be void. The model, the serial number and, if necessary, proof of installation, must be included in the claim. Claims for labor to
replace defective parts must be included with the part claim to receive consideration. Payment on claims for labor will be limited to the published labor
time allowance hours in effect at the time of repair. The Company may elect to require the return of components to validate a claim. Any defective part
returned must be shipped to the Company or the Company-authorized distributor, transportation charges pre-paid, and properly sealed and tagged. Th e
Company does not assume any responsibility for any expenses incurred in the field incidental to the repair of equipment covered by this warranty. The
decision of the Company with respect to repair or replacement of a part shall be final. No pe rson is authorized to give any oth er warranties or to assume
any other liability on the Company’s behalf unless done in writing by an officer of the Company.
GOVERNING LAW
This Limited Warranty shall be governed by the laws of the state of Delaware, U.S.A., excluding their conflicts of law principles. The United Nations
Convention on Contracts for the International Sale of Goods is hereby excluded in its entirety from application to this Limited Warranty.
Mile High Equipment LLC, 11100 East 45
Ice storage bins -Twenty-four (24) month parts and labor
IOD model dispensers - Twenty-four (24) months parts, Twelve (12) months
labor
Water filter systems - Twelve (12) months parts and labor (not including filter
cartridges)
to be eligible for credit. All claims outside this
th
Avenue, Denver, Colorado 80239 (303) 371-3737
August 2011
Page 3
GEMU090
Service
GEM090 service
This section contains information for the service
and repair of the GEMU090 ice machine.
Service Table of Contents
GEM090 service .............................................Page 1
Components: ...............................................Page 2
Evaporator and Auger...........................................Page 3
Control System ..............................................Page 4
Water System ...............................................Page 5
Storage ..................................................Page 6
Performance and Technical Specs ....................................Page 7
Electrical Sequence ............................................Page 8
Service Diagnosis .............................................Page 9
Service Diagnosis .............................................Page 10
Component Diagnostics..........................................Page 11
Ice Capacity ................................................Page 12
Removal and Replacement ........................................Page 13
GEMU090 Gearbox Access & Removal .................................Page 14
Water Seal Replacement .........................................Page 16
Evaporator Replacement .........................................Page 18
Drain Pump (if equipped) .........................................Page 19
Compressor replacement. ........................................Page 20
Bin and Cabinet ..............................................Page 21
Page 1
Page 4
GEMU090
Service
Components:
Refrigeration system, including air cooled
•
condenser, compressor, capillary tube and
evaporator.
Control system, including ice level sensor,
•
water sensor, auger motor sensor, controller,
control pad and transformer.
Auger drive system, including auger motor,
•
gear reducer and auger.
Auger support system, including top bearing
•
and water seal.
Water system, including the float and
•
reservoir.
Storage system, including ice storage bin,
•
drain and door.
The GEMU090 is a continuous flow ice machine.
When the control system senses that the storage
bin’s ice level is low, it turns on the compressor, fan
motor and auger drive motor.
During ice making the refrigeration system takes
heat from the evaporator. The evaporator is a
vertical refrigerated stainless steel tube containing
water and a slowly rotating auger. When the water
gets to the freezing point, ice begins to form. That
ice is very soft and is pushed up the evaporator
tube by the auger. As ice is made more warm
water enters at the bottom. The soft, mushy ice is
forced up to the top of the evaporator’s tube where
it is forced through nine tapered holes. As the ice is
pushed through the holes excess water is
squeezed out. The ice comes out of the holes
shaped as a rod of ice. The rods of ice are broken
off by being pushed against the tapered flange
above the holes, forming the irregular lengths of
pearl ice. The ice sweep, rotating with the auger,
moves the ice to the ice chute where it falls by
gravity into the storage bin.
Air Cooled
Condenser
Compressor
Liquid Line
Suction Line /
Heat
Exchange
Capillary Tube
Evaporator
Assembly
Auger Drive
System
Refrigeration System Schematic
Page 2
Page 5
GEMU090
Service
Evaporator and Auger
Ice Outlet
Auger
Bearing
Foam
Insulation
Rotating Half
of Water Seal
Stationary
Half of Water
Heat
Exchange
Tube Coil
Water Inlet
Seal
Cut Away View
Page 3
Page 6
GEMU090
Service
Control System
The control system operates the machine. The
controller operates on 12 volts AC, supplied by the
transformer. It uses an ultrasonic ice sensor to
measure ice level. The ultrasonic system transmits
sound waves into the ice storage bin and measures
the return time, when the return time is longer than
the preset time for bin full, the controller switches
the ice machine to an ice making mode. During ice
making the compressor, fan motor and auger motor
are operating.
The control system has two safeties: It will not
operate the machine without water and it will not
operate the machine if the auger motor is drawing
too much current or if it isn’t drawing any current.
The water sensor is checking the conductivity of
the water in the water reservoir. If there is no water
in the reservoir the conductivity will be zero and the
controller will either not start ice making or will stop
making ice.
The current or amps of the auger motor are
continually monitored by the controller during ice
making. If the current is too high, indicating an
overload, the controller will stop ice making. If the
current is zero, indicating an auger motor failure,
the controller will also stop ice making.
The control pad has two switches and three lights.
The left switch button is On/Off. The right switch
button is Clean/Reset. The left Ice Making light is a
status light, it is ON when the machine has been
switched to an ice making mode. The center light is
a Water light, it will be ON when the controller has
sensed that there is no water available. It will go
out when the water supply has been restored. The
right light is a Time to Clean indicator light. It is
switched ON by the controller after six months of
power connect time. It will go out after the machine
has been cleaned following the process in the
Maintenance section.
Glows Green when
unit is switched On
On/Off Control Button
Glows Red when there is no water
supplied to the machine
The machine will NOT make ice
when this light is on. It will restart
and the light will go out when the
water supply is restored.
Control Panel
Page 4
Glows Yellow when
it's time to clean the
machine
Clean Button
Page 7
GEMU090
Service
Water System
The auger is driven at about 11 RPM by the gear
reducer. The gear reducer is a sealed component
and does not require lubrication, as it contains a
charge of grease. The auger motor drives a set of
gears that all together reduce the motor speed to
the 11 RPM output speed and correspondingly
increasing the torque. The output shaft of the gear
reducer is hollow to accept the square end of the
auger.
The auger is one of the key components in this
product. It is a precision machined part cut from
solid stainless steel bar stock. It fits the inside of
the evaporator tube very closely and is aligned by
the gear reducer at the bottom and a self
lubricating bearing at the top.
As ice is made and forced up the evaporator, the
auger is being pushed down. That thrust is
supported by the bearings in the gear reducer.
Those bearings also provide alignment for the
bottom of the auger, keeping it centered in the
evaporator tube. The top bearing provides auger
alignment at the top.
Water is kept from leaking out the bottom of the
evaporator by the water seal. The water seal is the
type of seal called a face seal, with the outside
diameter of a stationary half pressed against
the inside of the evaporator tube and a
rotating half attached to the bottom of
the auger. The sealing action takes
place where the faces of the two
halves rub together.
slightly and water will flow into the reservoir
through the partially open float valve. It will flow in
continually as ice is made.
Water quality. Nearly all water supplies contain
some impurities or minerals. When ice is made
those minerals can remain behind in the ice
machine and coat its surfaces with a hard, stone
like substance known as scale. This scale must
occasionally be removed by scale remover. Scale
remover is a food grade acid that will dissolve the
scale so it can be washed away. Note: it is
important to ALWAYS dilute the scale remover
when using it on this machine. Never use undiluted
scale remover.
Some water treatment devices make very clean
water, Reverse Osmosis is one of those and this
machine may be used with RO water as long as
the conductivity is greater than 10
microsiemens/cm. Use of de-ionized water is not
recommended and will void the warranty.
Water Level
Water Sensor
Float Valve
and Reservoir
Water is the raw ingredient of
ice and it enters this machine
through the compression fitting in
the back. That leads to the float
valve and reservoir. When the float is
not supported by water, the float arm
is down and the attached float valve
is open. As water enters the reservoir, it
also flows into the reservoir’s outlet
tubing which leads to the
evaporator water inlet, filling the
evaporator. The float rises as
the water level is increased until
it has lifted high enough to force
the water valve to close, stopping
the flow of water. When the machine
is making ice, the water level will drop
Hose to
Evaporator
Inlet
Evaporator
Inlet
Hose to drain
Page 5
Page 8
GEMU090
Ice
Making
Check
Water
Time to
Clean
Clean
Reset
Service
Storage
The ice storage system is made up of a plastic
lined ice storage bin, covered by an insulated top
panel and an insulated swing open door with
gasket. The ice storage bin is foamed in place, so
the side panels are not removable.
Page 6
Page 9
GEMU090
Service
Performance and Technical Specs
Overall:
Refrigerant: 4.5 oz R-134a
•
Compressor: Hermetic, 1390 BTUH
•
Condenser: Forced draft
•
Fan blade: 3 blade, 6 inch
•
Evaporator: Stainless steel tube, copper coil
•
jacketed
Metering device: Cap tube
•
Auger drive: output speed 11 RPM
•
Water valve: Float in reservoir
•
Drain pump: Magnetic drive, controlled by
•
pressure switch
Bin control: Ultrasonic
•
Electrical Components:
Compressor - 2.8 - 3.1 amps
•
Fan motor
•
Auger motor, amp draw .4 - .5 amp
•
Drain pump motor
•
Drain pump switch
•
Controller
•
•
Transformer
•
Water sensor
•
Ice level sensor
•
Membrane switch assembly
Light Blink Information
All blink once and repeat every 2 seconds:
•
Auger motor overload
All blink twice and repeat every 2 seconds:
•
Auger motor low current
All blink once and repeat every 10 seconds,
•
controller failure.
Water light blinks red: water supply failure
•
Controller Reset:
Cycle power off and on
•
Diagnostic Codes: No diagnostic codes are kept
Time to Clean indicator light standard interval to
switch light on is 6 months, it can be changed to
once per year or disabled.
To Adjust:
1. From Off, press and hold the On/Off and Clean
Reset Buttons for 5 seconds.
2. Press and Hold the Clean Reset Button for 5
seconds, then press On/Off. Then press On/off
again to cycle thru the settings:
Control Timers
•
Power interruption, time to restart after power
restored: 2 minutes
•
Auger motor overload, time to restart: 4
minutes
•
Auger motor overload, restart window: 60
seconds
•
Auger motor low current, time to restart: 20
minutes
•
Auger motor low current, restart window: 60
seconds
•
Clean cycle time: 40 minutes total.
Note: During the auger motor restart window times,
there is no visible indication that the unit is in a
restart mode.
Ice Making Water
6 months On Off Off
1 year Off On Off
Disabled Off Off On
Light will automatically go out after a few seconds
of inactivity. Press Time To Clean to lock in the
new setting.
Quick reset of time to clean light: Press and hold
the Clean Reset button for 3 seconds.
Time to
Clean
Page 7
Page 10
GEMU090
Service
Electrical Sequence
Upon power being supplied, all the lights will blink
once and the control system will immediately check
for water in the reservoir. If there is water no further
action will occur until the On/Off button is pushed.
Pushing the On/Off button starts the machine. The
Ice Making light will switch on. The auger motor,
compressor and fan will begin to operate. Those
three components will continue to operate until the
Ice Level Control detects that ice has built up to the
pre-set level. At that point the control system will
begin a shut down process by shutting off the
compressor and fan motor.
After sixty seconds the auger motor will shut off.
The purpose of this is to remove any ice from the
evaporator so the auger motor can restart with
minimal load.
The machine will restart after the ice level has
fallen one inch or more.
Other Control Functions:
To Shut Off
the machine was off because the bin was full, the
unit will be switched to Off immediately. If the unit
was making ice, the compressor and fan motor will
shut off immediately, and the auger motor shut off
in sixty seconds. To shut the unit off immediately
while making ice, push and HOLD the On/Off
button until it shuts off.
To Clean:
step process. Pushing the Clean button while the
Ice Making light is On does not start the clean
cycle, it is only active from Off. Pushing the Clean
button from Unit Off starts the clean cycle:
•
•
•
•
Safety Shut Downs:
: Push and release the On/Off button. If
See Maintenance section for step by
Time to Clean light flashes
Auger motor operates for twenty minutes
Auger motor and compressor operate for
twenty additional minutes
Unit shuts off, Time to Clean reminder light
switches Off.
the water it is in contact with. If there is no water
present, there will be no electrical continuity and
the control system will stop the machine and cause
the Check Water light to blink Red, alerting the
user of a lack of water. When water has returned to
the reservoir, the unit will automatically restart.
Power interruptions:
failed during normal operation, the machine will
automatically restart after a two minute delay. If the
unit had shut down because of a safety, then the
unit remains in the shut down state.
Auger motor overload:
exceeds the preset limit for a certain time, the
controller will shut the compressor and auger motor
off. The controller will keep the compressor and
auger motor off for four minutes, then restart them.
The controller records each overload as a strike. It
will erase the strike(s) if the current draw in the
sixty seconds following the restart is below the
preset limit. If within the sixty seconds after the
restart the current again exceeds the limit, the
controller again shuts the machine down and a
second strike is recorded and four minutes later a
second restart occurs. If the current is again
excessive the third time, the unit will stop restarting
and the lights will flash on and off every two
seconds.
Auger motor low current:
the auger motor is not drawing any or minimal
current, it will shut the compressor and auger motor
down for twenty minutes before attempting a
restart. The twenty minutes are intended as time
for the auger motor to cool off if it has shut down on
its internal overload. The controller records that as
a strike. If in the next sixty seconds the auger
motor begins to draw current the strike is erased
and normal operation resumes. If the current is still
low, a second strike is recorded and the unit will
wait another twenty minutes before attempting a
third restart. If the third restart is normal, the strikes
are erased and normal operation is continued. If
the unit fails again, the unit will stop restarting and
the lights will flash twice on and off every two
seconds.
If the power to the machine
If the auger motor current
If the controller senses
Lack of water
without a full charge of water. The water sensor in
the reservoir is used to check continuity through
. It is critical that the unit not operate
Controller Failure:
every 10 seconds the controller has identified an
internal failure and must be replaced.
Page 8
If all lights are flashing once
Page 11
GEMU090
Service
Service Diagnosis
Problem Likely Cause Probable Solution
No power Plug unit into power supply
Unit switched off Push and release on/off button
Restore water supply, check sensor. If
RO water is too pure, unit cannot
No water, water diagnostic light is on
Compressor on, fan on, auger motor not
operating
Compressor on, fan on, auger motor
cutting off on over amp safety
operate.
Check float valve for restriction
Check float valve shut off lever position
Check auger motor for voltage, if none,
replace controller. If there is voltage,
check auger motor windings, if open,
replace auger motor.
Check evaporator for ice. Thaw out and
retry. Check top bearing and condition of
auger. Replace if worn.
Operate unit for a short time with auger
out of machine, water shut off and water
sensor bypassed. If auger motor still
overloads, replace gear reducer.
No ice
Compressor on, auger on, fan blade not
turning
Auger motor on, fan on, compressor not
drawing power
Auger motor on, fan on, compressor
cutting off on overload
Compressor on, fan on, auger motor on,
ice sweep not turning
Unit off on auger motor open safety
Unit plugged in but no power
Check fan blade for ease of rotation,
remove any blockage and retry. Check
fan motor, replace if not turning freely or
motor windings open.
Check compressor start relay, check
compressor windings.
Check compressor. See component
diagnostics.
Check ice sweep. If tight to auger, auger
is not turning. Gears stripped, replace
gear reducer.
Check connections to auger motor, if
voltage to motor and it does not operate,
replace motor.
If pump model check for water back up
or open safety switch.
Check transformer, replace if not
supplying 12 volts AC to controller.
Check switch membrane. See
component diagnostics.
If transformer and membrane are good,
replace controller.
Page 9
Page 12
GEMU090
Service
Service Diagnosis
Problem Likely Cause Probable Solution
With power on and Ice Making light on,
check connector, if secure jump the two
Ice level sensor failure
No ice, continued
Auger motor on but compressor and fan
motor are off.
Ice making light on, nothing operating. May be in a restart window. See page 7.
Dirty condenser Vacuum condenser fins
Air flow blocked Check for vent blockage
middle pins at J2 (bin stat)on the
controller together. Unit should start. If it
does, replace the sensor, if not, replace
the controller.
Restart unit. Check for power to
compressor and/or fan motor. If none,
replace controller.
Ice Making light blinking. Condition is
temporary, unit has been switched off.
Not keeping up, makes
ice but less than normal
Makes ice but also an
unusual noise
Water Leak
Gravity drain restricted
Pump drain slow
Scale on evaporator and auger
Torn door gasket, door does not close
tightly
Panels vibrating Check panels, adjust fit, tighten screws
Fan blade rubbing
Scale on evaporator and auger
Drain pump cuts in and out. Check valve failure, replace.
Tubes rubbing
Unit in very cold conditions Do not operate unit below limits
Drain tube off or cracked Check/repair drain tube
Water inlet connection loose Check/tighten connection
Check drain, clear of restriction. Ensure
it has a proper air vent.
Check for proper pump switch operation
and drainage
Clean with scale remover. See
Maintenance section.
Check gasket and door fit.
Check fan blade for foreign object.
Remove same. Check alignment.
Clean with scale remover. See
Maintenance section.
Check for tube contact to panel or
another tube.
Water flows continuously Float valve not shutting off
Page 10
Check float, if stuck free it. If leaking by
when full, replace the valve.
Page 13
GEMU090
Service
Component Diagnostics
Membrane Switch
Unplug and check connector pins (left side is pin
1), read about 10 ohms when activating the button,
and OL when not pressing the button: Pin 2-3
On/Off Switch; 4-3 Clean Reset Switch
Compressor
Check temperature of compressor, if very hot, add
access valves to refrigeration system and check
system pressures. If very low, add very small
amount of R-134a. If pressure does not improve,
capillary tube may be restricted. If pressures
improve find and correct refrigerant leak.
If compressor temperature is normal and
compressor is drawing high amps, check start
relay.
If relay is good and compressor is not overheating
but drawing high amps, replace compressor.
Pump Switch - Pump model only
The pump switch activates the pump based on
pressure to it from water inside the drain hose to
the pump inlet. It is normally open. When pressure
increases the switch closes, turning on the pump
motor until the pressure falls.
The safety switch (the red one) is normally closed
and operates at a higher activation pressure than
the pump switch. It stops operation of the machine
if it opens.
Ice Level Sensor
To operate, the unit must have:
•
Power to the controller
•
Water sensed
•
Call for ice
With power on and Ice Making light on, check
sensor connector, if secure and the unit not
operating, remove connector and jump the two
middle pins at J9 on the controller together. Unit
should start. If it does, replace the sensor, if not,
replace the controller.
Page 11
Auger
Comp
Page 14
GEMU090
Service
Ice Capacity
The rate of ice making is relatively fixed, it depends
upon the heat load and the ambient temperature
the machine is operating in. As either increase the
amount of ice made will decrease.
The machine will work to keep the ice bin full. A full
bin of ice is when the ice level is even with the top
of the front of the bin. When the ice level drops an
inch or more the machine will restart.
A capacity check will provide some idea of how
much ice is being made.
1. Operate the machine for 10 minutes until it is
stabilized.
2. Catch the ice as it is made for 15 minutes.
3. Weigh the ice and any melted water.
4. Multiply the weight from step 3 by 96 to get 24
hour capacity.
Noise
Normal ice making produces very little noise; there
will be sound from the compressor, fan and auger
drive motor. If there is a drain pump it will cycle
occasionally too. If the machine is making an
unusual noise that might be a sign that it needs to
be cleaned of mineral build up.
5. Compare to the chart below:
90oF. Air, 70oF water 59 lb / 24 hours
o
F. Air, 50oF. water 87 lb /24 hours
70
Note: Mineral scale build up inside the evaporator
will reduce the ice making rate, as will any lint or
dirt on the air cooled condenser or fan blade. All ice
making capacities listed by Ice-O-Matic are for
clean, new machines.
The ice storage bin is not refrigerated; it is an
insulated ice chest, so there is meltage. A
restricted drain or poorly operating drain pump will
allow water to puddle in the bin, increasing the ice
melt rate. A stopped up drain will cause the bin to
fill with water.
Refrigerant charge.
The charge is very small. Any leak will immediately
result in a loss of ice making capacity and
continued leaking will result in no ice being made.
The system is sealed, access must be by clamp on
valves, which must be removed after the repair is
completed.
Page 12
Page 15
GEMU090
Service
Removal and Replacement
Component Access
The machine is designed to be cleaned while built
in. See the Maintenance section for more
information.
Most components require the machine to be
removed from a built-in situation:
Fan motor – side service panel
•
Controller – top panel
•
Auger motor – top panel, back panel
•
Ice sensor – top panel
•
Drain pump – side service panel
•
Top bearing – top panel
•
Gear reducer – top panel, back panel
•
Ice sweep – top panel
•
Water seal – top panel, back panel, bin back
•
panel
Water reservoir or float - top panel
•
Evaporator / Auger / Water Seal / Gear Reducer
Service
The auger, top bearing, water seal and gear
reducer can be replaced without disturbing the
refrigeration charge. If the evaporator must be
replaced, then the refrigeration system must be
accessed so the charge can be recovered.
Evaporator construction
The evaporator is made up of a stainless steel
tube, wrapped with a coil of copper and then
heavily insulated. There is no refrigerant path to the
water inside of the evaporator. The inside of the
tube is polished and rifled with12 vertical grooves
that help guide the ice straight up the tube.
It is normal for mineral scale from the water to form
on the inside of the evaporator tube. That scale
must be removed by use of ice machine scale
remover using the process described in
Maintenance. Heavy scale build up will require the
process to be repeated. The inside of the
evaporator tube may be sanded vertically to
remove tough build up. Do NOT hone or clean with
a wire brush on a drill, as horizontal marks on the
inside of the evaporator will restrict the flow of ice.
A damaged evaporator must be replaced.
The auger can also have scale build up which must
be removed. It works best when it is clean and
shiny. Note that a wet auger will appear clean but
when dry the scale will be visible. Dry off the auger
(use your heat gun) to determine if it’s clean. If the
machine has been operated with worn bearings,
the auger may have rubbed the evaporator wall. If
the spiral edges or flights of the auger are
damaged, the auger must be replaced.
The ice breaker at the top of the evaporator
contains the pressed-in bearing. This bearing must
not be greased. If worn, the breaker with bearing
can be replaced.
The gear reducer is a sealed unit. The only service
part available for it is the drive motor and drive
motor capacitor.
Lubricants and Sealants
Food grade lubricant is useful in repair of this
model. Ice-O-Matic part number 6051036-01.
Food grade sealant is needed in repair of this
model. Ice-O-Matic part number 6051011-01.
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GEMU090
Service
GEM090 Gearbox Access & Removal
1.
Shut off water supply
2. Remove drain plug inside bin compartment
3. Disconnect power supply or unplug unit
Hazard of Electrical
Shock.
Disconnect Electrical
Power Before
Servicing.
4. Uninstall unit and pull out as needed for top
and back access.
5. Remove top panel
6. Remove back panel
10. Lift and remove ice chute
11. Remove 4 screws securing float reservoir &
set aside
7. Remove ice chute/bin wall by unscrewing 2
thumb screws and lifting it out
Chute
Ice Sweep
8. Remove 2 orange wires from water level
sensor (on top of float tank)
12. Remove gray water tube from evaporator
inlet
13. Disconnect power connection to auger motor
14. Remove 4 bolts securing breaker head to
freezer by using ¼” allen wrench (socket type
- best method)
9. Rotate ice sweep counter-clockwise and
remove ice sweep
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GEMU090
Service
15. Remove breaker & set aside
16. Pull auger from freezer by lifting straight up
(be careful as auger has sharp edges!)
Note: If auger does not lift freely, see Auger
Removal Procedure.
20. Carefully lift and rest gearbox & bracket
against back of compartment lip
17. Inspect auger flights for signs of wear
18. Inspect evaporator barrel for signs of radial
scoring
19. Remove 4 screws securing gearbox bracket
to compartment base
21. Remove four 5/32” allen head screws holding
adapter to evaporator
22. Remove evaporator from gearbox
** tools needed-1/4” & 5/32” allen wrench (T handle
or socket type suggested), Phillips screwdriver - 12
inch or longer recommended.
Replace gear reducer and install a new water seal.
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GEMU090
Service
Water Seal Replacement
1 Go through the prior steps to remove the gear
reducer.
2 Remove rotating half of water seal from bottom
of auger.
Rotating Half
of Water Seal
3 Clean auger of any sealant at water seal
mounting position.
7 Lubricate or moisten the outer edge of the new
seal and push it into the bottom of the
evaporator tube until flush with the bottom of
the tube. Be sure it is in as straight as
possible.
Note: Do NOT touch the inner ring of the water seal
with fingers or sealant. Wipe off with rubbing
alcohol if they were touched.
Apply Sealant
Here
4 Add a small bead of food grade silicone sealant
to the shoulder of the auger where the water
seal will go.
Note: Do NOT touch the mating surfaces of the
water seal with fingers or sealant.
5 Lubricate / moisten (lightly - use food grade
lube) only the rubber part of the new water seal
and slide it onto the auger, rubber side against
the auger shoulder. Force it onto the sealant as
far as it will go.
6 Remove the stationary half of the old water
seal from the bottom of the evaporator.
Stationary Half of Water Seal, Remove Old and
Install New
8 Position the gear reducer under the evaporator.
9 Push the gear reducer and adapter flange up
into the bottom of the evaporator until the
mounting holes line up. This forces the
stationary half of the water seal to the correct
location.
10 Screw in the four allen head screws into the
side of the bottom of evaporator tube.
11 Remount the gear reducer and evaporator
assembly into the ice machine. Secure the
mounting pan with the original screws.
12 Carefully lower the auger with the other half of
the water seal attached into the evaporator
tube. Rotate auger until it slips into place.
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GEMU090
Service
13 Slide breaker onto auger shaft. Secure with the
original four allen head bolts.
Remove 4 allen head screws holding breaker
to evaporator.
14 Reverse the balance of the steps to complete
putting the machine back together.
Gear Reducer Replacement
1 The gear reducer contains no internal
serviceable parts. Replace as a unit.
2 Follow all steps to remove gear reducer from
evaporator.
3 Remove bolts holding gear reducer to
mounting plate.
4 Separate gear reducer from mounting plate
and attach a new gear reducer.
Do not
overtighten
7 Lift breaker off and replace with a new part.
Note: Be sure auger shaft is smooth and un
damaged. A dark finish at the bearing area is
normal. Replace auger if damaged.
Auger Replacement
Auger replacement requires a new water seal.
Follow all steps to replace the water seal except
substitute a new auger.
Auger Removal Procedure
If the auger does not lift freely, it may be stuck in
the gear reducer. To release it:
1 Remove ice sweep.
2 Remove 4 allen head bolts holding breaker to
evaporator.
3 Place 4 hex nuts (5/8 size) as spacers
between the breaker and the top of the
evaporator.
Note: Do NOT overtighten bolts securing gear
reducer to mounting plate. Tighten only until the
washer contacts the blue grommet.
Ice Breaker Replacement
1 Disconnect power supply or unplug unit
2 Uninstall unit and pull out as needed for top
access.
3 Remove top panel
4 Rotate ice sweep counter-clockwise and
remove ice sweep
5 Remove ice chute
6
Spacer
Flat Washer
Shim
4 Place a large flat washer or suitable hex nut
(as a spacer) over the top of the breaker.
5 Thread a 5/16 - 18 x 1 inch bolt into the top of
the auger thru the washer and/or hex nut and
screw the bolt into the auger. As it tightens
against the nut it should lift and loosen the
auger. Once the auger has moved it should lift
out easily.
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GEMU090
Service
Evaporator Replacement
1 Go through all steps to remove the gear
reducer.
2 Add temporary refrigeration system access
valves to the discharge and suction sides of the
refrigeration system .
3 Recover the refrigerant.
4 Un-sweat the suction line and cap tube
connections from the evaporator.
5 Remove original dryer.
6 Attach permanent access valves to system.
7 Attach dry nitrogen to system and purge at
about 1 lb pressure while brazing all
connections, including access valves, dryer
and evaporator.
8 Remove nitrogen source, evacuate system to
300 microns or less.
9 Weigh in the nameplate charge.
Water Reservoir
1 Pull unit out to get access to top and back
panel.
3 Disconnect electrical power.
4 Remove control box cover
5 Unplug all wires.
6 Remove screws holding controller to box.
7 Remove controller.
8 Before touching replacement controller, touch a
metal surface of the cabinet to discharge any
static electricity.
9 Place new controller in control box, connect all
wires previously removed.
10 Reverse remaining steps to reassemble.
Ice level sensor
1 Pull out to get access to top panel.
2 Remove top panel.
3 Disconnect electrical power.
4 Remove control box cover
5 Unplug wire at J9.
2 Shut water supply off.
3 Pull drain plug and drain all water. Return plug
to its original position.
4 Loosen nut at water valve inlet and separate
inlet tube from reservoir valve.
5 Pull outlet hose off reservoir tank.
6 Remove screws holding reservoir to unit and lift
off.
7 Reverse steps to reassemble.
Controller
1 Pull out to get access to top panel.
2 Remove top panel.
Ice Level
Sensor
6 Remove 5 screws and lift sensor from control
box.
7 Replace with new part.
8 Reverse remaining steps to reassemble.
Page 18
Page 21
GEMU090
Service
Drain Pump (if equipped)
1 Shut off water supply
2 Remove all ice and/or any standing water.
3 Disconnect power or unplug unit
4 Uninstall and pull unit out to get access to left
side service panel.
Fan Blade or Motor
1 If equipped with drain pump follow all steps to
remove pump.
2 Unplug fan motor connection.
3 Remove four screws holding fan motor
brackets to shroud.
4 Pull fan blade and motor from unit.
5 Remove five screws and the service panel.
6 Disconnect electrical plug to pump motor
7 Disconnect drain hose from pump inlet
8 Disconnect discharge hose from pump
9 Remove two 3/8 inch nuts holding pump to
base, lift pump up and out.
10 Reverse steps to reassemble.
5 If not equipped with a drain pump:
6 Shut off water supply
7 Remove all ice and/or any standing water.
8 Disconnect power or unplug unit
9 Uninstall and pull unit out to get access to left
side service panel.
10 Remove five screws and the service panel.
11 Unplug fan motor connection.
12 Remove four screws holding fan motor
brackets to shroud.
13 Pull fan blade and motor from unit.
11 Service blade or motor and reverse to
reassemble.
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GEMU090
Service
Compressor replacement.
Note: If built in the unit will need to be pulled out.
1
Shut off water supply
2 Disconnect power supply or unplug unit
3 Uninstall unit and pull out as needed for side
and back access.
4 Remove all panels and door:
Back panel including drain and power supply
•
panels.
Side service panel
•
Kickplate
•
Top panel
•
5 Go through all steps to remove drain pump
and/or fan motor.
6 Remove drain hose from unit.
7 Obtain or make an 11" prop from 3/4" PVC or
similar.
8 Remove 2 screws (at back) holding base to
side panels
9 Remove screws holding strut to base
Note: Placing it over the leg leveler and next to the
strut works the best.
13 Add temporary refrigeration system access
valves to the discharge and suction sides of the
refrigeration system.
14 Recover the refrigerant.
15 Remove the four hair pins securing compressor
to chassis.
16 Disconnect wires, overload and and relay from
compressor.
17 Push back suction line insulation.
18 Unsweat the discharge and suction
connections at the compressor.
19 Remove the compressor from the unit.
20 Remove dryer from unit.
21 Attach permanent schrader access valves to
unit.
22 Attach dry nitrogen supply to access valves,
purge at about 1 lb pressure during brazing.
10 Remove screw holding left side panel to base
11 Loosen BUT DO NOT REMOVE
two screws at front holding side
panels to base
12 Lift back of unit up and support
with the 11" prop.
Strut
Prop
Step10
23 Install new dryer.
24 Install new compressor. Install at least 3 of the
hair pins to secure the compressor. The fourth
is optional.
25 Make all braze connections needed to seal
system.
26 Remove nitrogen supply. Evacuate system to
at least 300 microns.
27 Weigh in nameplate charge.
28 Reconnect all wires, components and panels
removed to access compressor.
29 Reinstall unit. Operate unit and test.
Page 20
Page 23
GEMU090
Service
Bin and Cabinet
The bin and cabinet can be separated from the
base. Either the ice making evaporator system
must be lifted out and securely suspended or the
refrigeration system opened and the connections to
the evaporator unbrazed.
1 Remove the unit from its installed position.
2 Disconnect water supply.
3 Disconnect / unplug unit from power supply.
4 Drain evaporator.
5 Empty bin of ice and water.
6 Disconnect drain hose from bottom of bin.
1 Remove top, back and side service panels.
7 Remove door.
8 Remove kickplate.
17 Lift bin and cabinet off chassis.
Auger Motor or Motor Capacitor
1 Remove the unit from its installed position.
2 Disconnect water supply.
3 Disconnect / unplug unit from power supply.
4 Empty bin of ice and water.
5 Remove top panel.
6 Remove both bolts holding motor to gear
reducer.
7 Lift motor winding and capacitor up and out of
machine.
8 Cut wires and separate winding from capacitor.
Change either and reconnect motor to
capacitor.
9 Remove front service panel
10 Remove screw holding service panel bracket.
11 Remove two screws holding baffle at right side
of condenser.
12 Unplug wires from compressor and fan motor.
Be sure wires from control box to base are free
and disconnected.
13 Remove four screws holding each corner of the
chassis to the base.
14 Remove two screws holding left rear strut to
base.
15 Remove one screw holding left side panel to
base.
16 Either go thru the process to remove gear
reducer and evaporator from unit or recover
refrigerant and disconnect at evaporator.
Note: Be SURE wires are connected per the label
on the motor: Black to Black to Capacitor and Red
to Capacitor. If connected incorrectly, motor will
turn the wrong way. Output shaft or auger MUST
turn CCW (counterclockwise) looking from above
or the unit will be damaged during ice making.
9 Pull rotor from gear reducer (if changing motor)
10 Insert new rotor (if changing motor).
11 Reinstall winding and capacitor assembly.
Secure with the original screws.
12 Return all panels to their original positions.
13 Reconnect water and power.
14 Reinstall unit.
Note: If leaving evaporator & gear reducer in unit,
have a helper support them while the cabinet is
removed.
Page 21
Page 24
Wiring Diagram
Page 25
Schematic Diagram
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