Hoshizaki FM-750AKE User manual

NO. F054-812
ISSUED: AUG. 3, 2010
REVISED:
SERVICE MANUAL
HOSHIZAKI
MODULAR ICE MAKER
MODEL FM-750AKE
FM-750AKE-N
FM-1000AKE
FM-1000AKE-N

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CONTENTS PAGE
I. SPECIFICATIONS-------------------------------------------------------------------------------------- 1
1. FEATURES ---------------------------------------------------------------------------------------------- 1
[a] LOW VOLTAGE------------------------------------------------------------------------------------ 1
[b] OVERLOAD ERROR------------------------------------------------------------------------------ 1
[c] ERROR CODES AND RECORDS------------------------------------------------------------- 1
[d] OTHER INFORMATION-------------------------------------------------------------------------- 1
2. DIMENSIONS/CONNECTIONS -------------------------------------------------------------------- 2
3. SPECIFICATIONS ------------------------------------------------------------------------------------- 3
[a] FM-750AKE ----------------------------------------------------------------------------------------- 3
[b] FM-750AKE-N -------------------------------------------------------------------------------------- 4
[c] FM-1000AKE---------------------------------------------------------------------------------------- 5
[d] FM-1000AKE-N------------------------------------------------------------------------------------- 6
4. CONSTRUCTION-------------------------------------------------------------------------------------- 7
II. MAINTENANCE AND CLEANING INSTRUCTIONS------------------------------------------ 8
1. EXTRUDING HEAD, HOUSING BEARING, AUGER BEARING--------------------------- 8
2. MECHANICAL SEAL---------------------------------------------------------------------------------- 8
3. GEAR MOTOR------------------------------------------------------------------------------------------ 9
4. CONDENSER------------------------------------------------------------------------------------------- 9
5. AIR FILTER (AIR-COOLED MODEL ONLY) ---------------------------------------------------- 9
6. WATER VALVE----------------------------------------------------------------------------------------10
7. CLEANING OF WATER SYSTEM----------------------------------------------------------------11
8. PERIODICAL CLEANING---------------------------------------------------------------------------13
III. TECHNICAL INFORMATION----------------------------------------------------------------------14
1. WATER CIRCUIT AND REFRIGERANT CIRCUIT-------------------------------------------14
2. WIRING DIAGRAM -----------------------------------------------------------------------------------15
[a] WIRING DIAGRAM-------------------------------------------------------------------------------15
[b] CONTROL BOX LAYOUT ----------------------------------------------------------------------17
3. ICEMAKING MECHANISM -------------------------------------------------------------------------18
[a] EVAPORATOR (CASING)----------------------------------------------------------------------18
[b] AUGER----------------------------------------------------------------------------------------------18
[c] EXTRUDING HEAD (BEARING)--------------------------------------------------------------18
[d] HOUSING-------------------------------------------------------------------------------------------19
[e] MECHANICAL SEAL-----------------------------------------------------------------------------19
[f] COUPLING (SPLINE JOINT)-------------------------------------------------------------------19
[g] GEAR MOTOR ------------------------------------------------------------------------------------19
[h] BELT HEATER ------------------------------------------------------------------------------------19
[i] REMOVABLE FLANGE --------------------------------------------------------------------------19
[j] SOCKET HEAD CAP SCREW -----------------------------------------------------------------19
4. WATER CIRCUIT -------------------------------------------------------------------------------------20
[a] RESERVOIR (WATER TANK)-----------------------------------------------------------------20
[b] FLOAT SWITCH ----------------------------------------------------------------------------------20
[c] CONTROL WATER VALVE --------------------------------------------------------------------20
[d] FLUSH WATER VALVE-------------------------------------------------------------------------21
[e] WATER REGULATOR (WATER-COOLED MODEL ONLY)---------------------------21

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[f] DRAINING ICEMAKER IN SUBFREEZING CONDITIONS-----------------------------21
5. REFRIGERATION CIRCUIT------------------------------------------------------------------------22
[a] SERVICE INSTRUCTIONS --------------------------------------------------------------------22
[b] REFRIGERANT -----------------------------------------------------------------------------------22
[c] COMPRESSOR -----------------------------------------------------------------------------------23
[d] EVAPORATOR CASING------------------------------------------------------------------------23
[e] CONDENSER--------------------------------------------------------------------------------------23
[f] CONDENSER COOLING FAN MOTOR-----------------------------------------------------24
[g] WATER REGULATOR (WATER-COOLED MODEL ONLY)---------------------------24
[h] DRIER -----------------------------------------------------------------------------------------------24
[i] THERMOSTATIC EXPANSION VALVE -----------------------------------------------------25
[j] ACCESS VALVE-----------------------------------------------------------------------------------25
6. ELECTRIC CIRCUIT ---------------------------------------------------------------------------------26
[a] BASIC OPERATION -----------------------------------------------------------------------------26
[b] TIMING CHART -----------------------------------------------------------------------------------27
[c] SEQUENCE ----------------------------------------------------------------------------------------28
[d] OPERATION BOARD----------------------------------------------------------------------------40
[e] CONTROLLER BOARD-------------------------------------------------------------------------40
[f] CHUTE, BIN CONTROL SWITCH-------------------------------------------------------------40
[g] SPOUT, SPOUT COVER-----------------------------------------------------------------------41
[h] DEICING HEATER (BELT HEATER) --------------------------------------------------------42
[i] CRANKCASE HEATER --------------------------------------------------------------------------42
7. OPERATION BOARD--------------------------------------------------------------------------------42
[a] OPERATION BUTTONS------------------------------------------------------------------------42
[b] SETTING MODEL NUMBER-------------------------------------------------------------------43
[c] DISPLAYING COMPRESSOR OPERATING HOURS, CYCLE TIME, MODEL
NUMBER AND SOFTWARE VERSION -----------------------------------------------------43
[d] DISPLAYING ERROR LOG--------------------------------------------------------------------45
[e] RESETTING ERROR LOG---------------------------------------------------------------------46
[f] RESETTING COMPRESSOR OPERATING HOURS------------------------------------46
[g] REDUCING COMPRESSOR STARTING TIME-------------------------------------------47
8. PROTECTORS ----------------------------------------------------------------------------------------47
[a] INDICATION ---------------------------------------------------------------------------------------47
9. ERROR CODES---------------------------------------------------------------------------------------48
10. PERFORMANCE DATA -----------------------------------------------------------------------------50
[a] FM-750AKE ----------------------------------------------------------------------------------------50
[b] FM-750AKE-N -------------------------------------------------------------------------------------51
[c] FM-1000AKE---------------------------------------------------------------------------------------52
[d] FM-1000AKE-N------------------------------------------------------------------------------------53
IV. SERVICE DIAGNOSIS -----------------------------------------------------------------------------54
1. NO ICE PRODUCTION------------------------------------------------------------------------------54
2. LOW ICE PRODUCTION----------------------------------------------------------------------------55
3. OTHERS-------------------------------------------------------------------------------------------------56
V. REMOVAL AND REPLACEMENT OF COMPONENTS-------------------------------------57
1. SERVICE FOR REFRIGERANT LINES ---------------------------------------------------------57
[a] SERVICE INFORMATION----------------------------------------------------------------------57
[b] REFRIGERANT RECOVERY------------------------------------------------------------------58

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[c] EVACUATION AND RECHARGE-------------------------------------------------------------58
2. BRAZING------------------------------------------------------------------------------------------------59
3. COMPRESSOR----------------------------------------------------------------------------------------59
4. DRIER----------------------------------------------------------------------------------------------------61
5. EXPANSION VALVE ---------------------------------------------------------------------------------61
6. WATER REGULATING VALVE - WATER-COOLED MODEL ONLY --------------------62
7. EVAPORATOR ASSEMBLY -----------------------------------------------------------------------63
8. CONTROL WATER VALVE ------------------------------------------------------------------------67
9. FLUSH WATER VALVE -----------------------------------------------------------------------------67
10. CONTROLLER BOARD -----------------------------------------------------------------------------68
[a] MODIFICATION-----------------------------------------------------------------------------------68
[b] REPLACEMENT ----------------------------------------------------------------------------------68

1
I. SPECIFICATIONS
1. FEATURES
[a] LOW VOLTAGE
When the supply voltage is too low or surrounding high-current equipment starts up, the
voltage in the icemaker may drop temporarily. In this case, the compressor will fail to start, or
the gear motor will lock during the icemaking operation. The locked gear motor may apply
the maximum torque to the icemaking mechanism and damage its parts. To avoid this
trouble, the icemaker will be shut down when the voltage drops. The icemaker will restart
automatically when the proper voltage is restored.
[b] OVERLOAD ERROR
When the above protection fails to evade the overload condition and the gear motor has a
high current and a low rotation speed, the icemaker will shut down for protection. The
icemaking mechanism will have extensive damage, if this condition is repeated ten times. In
this case, the icemaker will display an error code to notify the user of the excessive load on
the icemaking mechanism and the need of its replacement.
[c] ERROR CODES AND RECORDS
When the icemaker shuts down with an error, the display will show an error code “E_”. A
maximum of eight most recent records are memorized and can be checked at the time of
service or inspection.
[d] OTHER INFORMATION
Other information is also available from the controller board. See “III. 7. OPERATION
BOARD” for details.

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2. DIMENSIONS/CONNECTIONS
FM-750AKE, FM-750AKE-N
FM-1000AKE, FM-1000AKE-N

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3. SPECIFICATIONS
[a] FM-750AKE

4
[b] FM-750AKE-N

5
[c] FM-1000AKE

6
[d] FM-1000AKE-N

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4. CONSTRUCTION

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II. MAINTENANCE AND CLEANING INSTRUCTIONS
IMPORTANT
1. This icemaker must be maintained individually, referring to the instruction manual
and labels provided with the icemaker.
2. To have the optimum performance of this icemaker, the following consumable parts
need periodical inspection, maintenance and replacement:
Extruding head (top bearing)
Housing (lower bearing)
Mechanical seal
These parts should be inspected at least once a year or every 10,000 hours of
operation. Their service life ultimately depends on water quality and environment,
therefore more frequent inspection and maintenance may be required.
1. EXTRUDING HEAD, HOUSING BEARING, AUGER BEARING
These parts should be replaced if a diametrical gap of more than 0.5 mm is found when at
least three spots are checked by changing the direction of the auger on each bearing.
It depends on the water quality and conditions, but normally the bearings should be checked
for wear after a total of 8,000 - 10,000 hour operation from installation date.
Note: The clearance between the auger blades and the evaporator interior is 0.4 - 0.5 mm.
If the bearings and rotating parts are worn out to create a larger clearance, the
evaporator interior may be damaged. (The diameters differ by 0.8 - 1.0 mm.)
If the auger surfaces against which the bearings contact are no longer smooth or
show any burrs or abrasions during the above inspection, replace the auger.
2. MECHANICAL SEAL
The mechanical seal prevents water leaks from between the auger and the housing bearing
and gradually wears out to reduce its watertightness. Check the amount of water leakage
from the drain pipe located at the side of the gear case to determine the necessity of
replacement.
Total operation time Water leakage
3,000 hours 0.1 mL/h
10,000 hours 0.5 mL/h
Note: The water leakage will exceed the above amount with scale/dirt build up or damage
on the mating surface. Replace the mechanical seal when the water leakage exceeds
0.5 mL/h.

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3. GEAR MOTOR
After the following hours of operation, check the gear motor for excessive noise caused by
increased torque or deterioration of mechanical parts.
Bearing, gear and other mechanical parts: 10,000 hours
Oil seal: 5 years
Note: When the output shaft oil seal is exposed to a large amount of water at one time,
water may enter the gear case. Always drain the water circuit before removing the
auger for service.
4. CONDENSER
Check the condenser once a year, and clean if required by using a brush or vacuum cleaner.
More frequent cleaning may be required depending on the location of the icemaker.
5. AIR FILTER (AIR-COOLED MODEL ONLY)
Plastic mesh air filters remove dirt or dust from the air, and keep the condenser from getting
clogged. If the filters get clogged, the icemaker’s performance will be reduced. Remove and
clean the air filters at least twice per month:
1) Slide the air filter off the louver.
2) Clean the air filter by using a vacuum cleaner. When severely clogged, use warm water
and a neutral cleaner to wash the air filter.
3) Rinse and dry the air filter thoroughly, and place it in position.

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6. WATER VALVE
1) Disconnect the power source.
2) Close the water supply tap.
3) Disconnect the inlet hose from the water valve.
4) Remove the mesh filter from the water valve.
5) Clean the mesh using a brush.
6) Replace the mesh and inlet hose in their correct positions.
7) Open the water supply tap.
8) Connect the power source.
9) Check for leaks.

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7. CLEANING OF WATER SYSTEM
WARNING
1. HOSHIZAKI recommends cleaning this unit at least twice a year. More frequent
cleaning, however, may be required in some existing water conditions.
2. Do not touch the operation switch with damp hands.
3. Always wear rubber gloves, eye protectors, apron, etc. for safe handling of the
cleaner and sanitiser.
4. Use the cleaners and sanitisers recommended by Hoshizaki. Contact your local
Hoshizaki office for further details. (The instructions below give an example of
those recommended cleaners and sanitisers.)
5. Never mix cleaning and sanitising solutions in an attempt to shorten cleaning time.
6. Wipe off any splashed or spilt cleaner/sanitiser immediately.
7. Do not use any ammonia type cleaners on any part of the icemaker.
<STEP 1>
Dilute the solutions with water as follows:
Cleaning solution: “Nickel-Safe Ice Machine Cleaner” by The Rectorseal Corporation or
similar. Prepare approximately 3 L of solution as directed on the
container.
Sanitising solution: 30 mL of 5.25% sodium hypochlorite with 7.6 L of water or the
Hoshizaki recommended sanitiser as directed on the container.
IMPORTANT
For safety and maximum effectiveness, use the solutions immediately after dilution.
<STEP 2>
Use the cleaning solution to remove lime deposits in the water system.
1) Open the plastic access flap on the front panel.
2) Press the stop button to activate the flush cycle (approx. 10 minutes).

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3) Remove all ice from the storage bin to avoid contamination by the cleaner.
4) Unplug the icemaker. Remove the top and front panels.
5) Remove the cover of the reservoir. Remove any loose debris or scale.
6) Carefully fill the reservoir with the solution to the overflow point. If necessary, use a small
brush to clean the inside of the reservoir.
7) Refit the reservoir cover.
8) Check that the operation switch is in the “ON” position.
9) Loose fit the front and top panels.
10) Allow the icemaker to stand for about 10 minutes, then plug in the icemaker to make ice
with the solution.
11) With the water supply tap open, allow the machine to continue icemaking for a further 20
minutes. Open the access flap and press the stop button.
12) Allow time for the gear motor to stop and the water system to drain.
13) Unplug the icemaker.
14) Refit the top and front panels. Plug in the icemaker.
15) Allow the icemaker to make ice for approximately 10 minutes.
16) Pour warm water into the storage bin to melt any ice down the drain.
Note: 1. If the machine has heavy deposits of scale, repeat the complete cleaning
procedure.
2. Do not increase the proportion of cleaning solution to shorten cleaning times, as
this may lock the auger when completing item 10).
<STEP 3>
Note: Sanitising should always be completed after cleaning or alternately as an individual
procedure if conditions exist to make it necessary.
Use 2.8 litres of the sanitising solution to sanitise the icemaker.
17) Follow items 1) to 16) to complete sanitisation of the water system.

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8. PERIODICAL CLEANING
a) Machine and Bin Exterior
Wipe the exterior at least once per week with a clean, soft cloth. Use a damp cloth containing
a neutral cleaner to wipe off grease or dirt.
b) Storage Bin Interior Cleaning/Sanitisation (as required)
1) Open the storage bin door, and remove all ice.
2) Wash the bin liner, ice deflector and door inner surface with a neutral non-abrasive
cleaner. Rinse thoroughly with a clean cloth and fresh water.
3) Mix 5 litres of water with 18 mL of 5.25% sodium hypochlorite solution in a suitable
container or the recommended Hoshizaki sanitiser as directed.
4) Soak a clean sponge or cloth with the solution and wipe all the surfaces of the bin liner, ice
deflector and door inner surface.
5) Rinse thoroughly with fresh water and a clean cloth to wipe off the solution. Close the bin
door.
Note: Some solutions may cause damage to the bin liner surfaces or corrosion on the metal
parts. Always rinse the sanitiser unless directed otherwise by Hoshizaki guidelines.

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III. TECHNICAL INFORMATION
1. WATER CIRCUIT AND REFRIGERANT CIRCUIT
FM-750AKE, FM-750AKE-N
FM-1000AKE, FM-1000AKE-N
Pressure Switch
Cut-out 3.14 + 0.15/0 MPa
Cut-in 2.26 ± 0.15 MPa

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2. WIRING DIAGRAM
[a] WIRING DIAGRAM
FM-750AKE(-N)

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FM-1000AKE(-N)