icetro IM-770-AN Supplement

IM-770-AN/F INSTALL & SERVICE MANUAL

Ice Machine Specs
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Ice Machine Specs
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Receiving & Unpackaging
Dispensers
All equipment leaves our distribution points in new condition.
When receiving new equipment, please pay close attention to the packaging for
any damage to the crating. If there appears to be any exterior damage, please
either note the damaged on the delivery bill of lading OR refuse it.
Failure to note damage on BOL or refuse damaged equipment means
that the receiver accepts all liability for damaged equipment.
Damage
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Proper Installation
ID-0770
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Installation, Start Up, and Check
Please double check these items before install & start-up before calling for service.
(These items are not covered under your Labor Warranty)
1. Has all tape and packing materials been removed from Machine?
2. Is the unit installed in a location that is away from heat generating equipment or direct sunlight?
3. Is the unit level front to back and side to side? Adjustable legs on bins and dispensersmake this quick and easy.
4. Is the correct electrical power provided? Ensure the unit has the specified voltage and amperageand ison a dedicated circuit. Do not use a
drop cord or power strip with any ice machine. This could cause a voltage drop and compensatoryamperagespike or cause the circuit
breaker to trip.
5. Check drain line pipe sizes. Insurethey are ¾ inch and line drops ¼ inch per foot of run to insure both machine and bin drainage is
effective.
6. Is water supplied to the unit? Water Line size, 3/8 inch, must be supplied to ensure sufficient water flow is always available. Required
water pressure is 20 psi minimum and 80 psi maximum. This unit is designed to work with water temperatures of 50°F -90°F.
7. Is the unit installed in an area with sufficient ventilation at the back for properrejection of condenserheat? The manufacturer requires 17”
of clearance above the unit for maintenance and service. Additionally, 8” of clearance is required at the back and sides of the unit. Fresh
air is taken in from the front and left-side and dispelled from the back.
8. This unit is designed to work in ambient air temperatures of 50°F -100°F.
9. Scale or Mold build-up can affect the sequence of operation and production. Is a water filter installed? We recommend our exclusive
Citryne Pro Ice Filtration for the best results. Scale will increase operating costs and reduce or shut down the machine’s
performance.
10. Do not install this unit outdoors.
11. If you are installing an ice maker on top of an existing bin, check the bin to it insure it has a baffle in the bin to keep ice
from coming out of the bin door.
12. If you are installing the ice maker on top of a dispenser, the dispenser manufacturer must provide the top kit to prevent
leaks and bin problems. Additionally, an Icetro thermostat kit is required (ITS-150-KIT).

Ensure the ICE-OFF-WASH switch
is set to ‘ICE’.
Ice will begin to enter the ice storage bin
after 3 minutes of the compressor
& condenser fan being energized.
The size of your ice storage bin, plus
the ambient & water temps will
Determine how long it will
take to fill the bin. Proper Installation
IM-0770
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Proper Installation
IM-0770
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Install machine on an ice storage bin and ensure both are level to
eliminate improper operation.
Additionally, it is recommended to use the supplied seismic
brackets to secure the ice machine and bin together.
An air deflector is included with self-contained, air-cooled models
to prevent exhausted air from returning back to the condenser.
Seismic Bracket
Air Deflector

IM-0770
Sequence Of Operation
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IM-0770-AN/AF Sequence of Operation
Start-Up Sequence
Power switch set to the “ICE” position:
•Gear motor, inlet water valve, and bypass valve is energized simultaneously.
•Bypass valve stays energized for 50 seconds.
•Bypass valve is de-energizes for 10 seconds.
•Compressor energizes and freeze cycle begins.
•Once the head pressure reaches 235 psig, the fan cycle switch closes and the fan motor energizes.
Shut-Down Sequence
Power switch set to the “OFF” position while in freeze:
•Compressor is de-energizes immediately.
•Head pressure drops to 175 psig & the fan cycle switch opens, de-energizing the fan motor.
•Gear motor de-energizes 1 minutes after the power switch is put in the “OFF” position.
Note: Sump remains full of water. Dump valve does not energize and drain, so the
sump remains full of water when the machine is off.
Shut-Down Sequence Via Bin Switch
Same as the previous shut-down sequence:
•When the bin-switch is made or broken, the machine starts or stops with nearly no delay (2 seconds max).
Purge Cycle (set for every 12 hours)
Total Cycle Time = 20 minutes:
•Compressor is de-energized. Dump valve energizes (emptying sump) and the gear motor remains energized.
•Approximately 5 minutes in, the gear motor is de-energized & the inlet water valve is energized, refilling the
sump and flooding the evaporator with water.
•19 minutes in, the dump valve is energized (draining all water).
•19.5 minutes in, the inlet water valve & gear motor is energized.
•20 minutes in, the compressor is energized.
•When head pressure reaches 230 psig, the fan motor is energized
Note: The machine drains & refills 2 times, not continuously.

IM-0770
LED Functions
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IM-0770
Stopping the Ice Machine
Set the power switch on the front of the ice machine to the “OFF” position.
•While ice machine is underway, all refrigeration stops, but the motor
continues to run for an additional 60 seconds to protect the motor
from any remaining water or ice that may be in the cylinder.
•If the dump valve is energized and the machine is draining, the ice machine
will stop all operation once all draining has stopped.
•If “OFF” is selected less than 1 minute after “DRAIN” is selected, while
the machine is making ice, the motor will run for its remaining time
before all operation is stopped.
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IM-0770
Drop Zone
IM-0770-AN/AF Drop Zone Chart.
(A)11.3” (B)11.4” (C)22” (D)25.4”
A
B
C
DIce Outlet is 5.4” ID

IM-0770
Wiring Diagram
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IM-0770
PCB
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Main
Power
Heater
Cond.
Fan
Comp
Bypass
Valve
Dump
Valve
Motor
Tachometer
LED
Display
Float
Switch
Bin
Switch
Mode
Switch
HPS
S/L
Thermistor
L/L
Thermistor
Water
Valve
Gear
Motor
D/S

IM-0770
Key Features
Urethane insulated & sealed to prevent
moisture penetration, which can rupture the
refrigeration serpentine.
Non-vented gear box to prevent lubrication breakdown.
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Flaker Extruder
& Breaker
Nugget Extruder
& Breaker
Flake & Nugget Extruder Heads are Interchangeable
•Carbon bearing is pressed inside of extruder head.
•No grease or maintenance to prevent major
mechanical breakdowns.
•Simply check extruder/bearing & replace if
required.
Extruder with Carbon
Bearing Pressed Into Place
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IM-0770
Key Features

Spiral circular cutting blade designed to reduce gearbox torque
and provide greater durability.
User manual state that 17” of clearance is required to service
and remove auger on the IM-0770!
Pin cut spring insertion in
bottom of flight.
Spline cut fits into reverse spline
coupling on gear box shaft, which
ensures no imbalance in
bottom bearing.
Spring loaded carbon/ceramic
mechanical seal.
Tapered flight
reduces torque.
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IM-0770
Key Features

Float Sensor Water valve
operation Physical state
High water level
sensor
Low water level
sensor
0(Close) 0(Close) ON Water tank Empty
0(Close) 1(Open) The current
operation continues.
The water only fills to the lower
part.
1(Open) 0(Close) The current
operation continues.
No definition
(Physically impossible)
1(Open) 1(Open) OFF Water tank Full
Water valve operates separately according to the water level sensor
Water tank
Empty
The water
only fills to
the lower part.
Water tank
Full
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IM-0770
Key Features
Water Level Float Switch

Poor maintenance, leaking gaskets/bolts, or a plugged drain can destroy a machine: If bolts
at the top extruder or lower housing assembly leak, scale can build up on the urethane
insulation, the lower housing assembly, and/or the gear box and destroy those parts.
When removing bolts, new o-rings and/or new bolts with o-rings should be used.
If bolts are not tightened properly (or o-rings damaged) the leaks above will occur.
Should the drain pan’s drain line
become plugged, it will overflow and
cause scale to greatly damage unit.
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IM-0770
Service Tips

Visually inspect all hex head bolts
holding lower housing assembly
to evaporator barrel for leaks.
Drains have been enlarged to
prevent overflow & scale
buildup on critical parts.
Use caution during reassembly
to ensure all new bolts are cross
tightened evenly.
Note: Evaporator barrel bolts are reverse thread to remove 19
IM-0770
Service Tips

Service Fault Diagnosis
Type Cause Indicator Action to Take
Bin Full Storage bin is full of ice. ‘Full’ indicator light is on. None –Enjoy your ice!
Water Supply
Error Water is not being supplied on time. ‘No Water’ indicator light is on.
Check water supply.
Check water reservoir is full.
Check operation of water level sensor.
Check operation of water dump valve.
Check water dump valve for leaks.
Evaporator Temp
Too High Error Evaporator is not cold enough. ‘Temp’ indicator light flashes.
Check refrigerant charge (too low).
Check that compressor is running.
Check TXV operation.
Check S/L thermistor
Evaporator Temp
Too Low Error Evaporator inlet temperature is too cold. ‘Temp’ & ‘Motor’ indicators flash simultaneously every 2 seconds.
Unplug & plug back in after 1 hour.
Check TXV operation.
Check L/L thermistor.
Check liquid-line solenoid valve.
Check motor/gear box operation.
Low Condenser
Temp Error Ambient temp is lower than 33.8°F. ‘Temp’ indicator flashes every 4 seconds.
Raise ambient temperature above
50°F.
High Condenser
Temp Error
Ambient temp is too high or condenser fails to cool
below 167°F. ‘Temp’ indicator light is on.
Lower ambient temperature.
Check air filter/condenser.
Check fan motor/blade.
Check fan cycle switch.
Check L/L thermistor
Locked Motor
Error Motor is locked by foreign objects ‘Motor’ indicator light is on.
Unplug & plug back in after 1 hour.
Check motor/gearbox operation.
Check auger/agitator.
Check for ice jam.
Check for scale buildup.
S/L Thermistor
Error Suction-line thermistor malfunctions. ‘Temp’ indicator light is on & ‘Motor’ indicator flashes. Replace S/L thermistor.
L/L Thermistor
Error Liquid-line thermistor malfunctions. ‘Temp’ indicator flashes & “Motor’ indicator light is on. Replace L/L thermistor.
High Pressure
Error Condenser fails to cool. ‘Temp’ and ‘Motor’ indicators lights are both on simultaneously.
Check refrigerant charge (too high).
Check air filter/condenser.
Check fan motor/blade.
Check high pressure switch.
Check fan cycling switch. 20