Hoshizaki KM-150BAF User manual

™
SERVICE MANUAL
ISSUED: FEB. 27, 1998
KM-150BAF
KM-150BWF
CRESCENT CUBER
Reliability is a
beautiful thing
TM
REVISED: DEC. 14, 2003
NUMBER: 73066

2
IMPORTANT
Only qualified service technicians should attempt to service or maintain this icemaker.
No such service or maintenance should be undertaken until the technician has
thoroughly read this Service Manual.
HOSHIZAKI AMERICA, INC.
618Highway74South
PeachtreeCity,GA 30269
Attn: HOSHIZAKITechnicalSupportDepartment
Phone: [phone]TechnicalService
[phone]
Fax: [phone]
NOTE: Toexpediteassistance,allcorrespondence/communicationMUST includethefollowing
information:
• ModelNumber
• SerialNumber
• Completeanddetailedexplanationoftheproblem
HOSHIZAKI provides this manual primarily to assist qualified service technicians in the
service and maintenance of the icemaker.
Should the reader have any questions or concerns which have not been satisfactorily
addressed, please call or write to the HOSHIZAKI Technical Support Department for
assistance.

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• Pleasereview thismanual. Itshouldbereadcarefullybeforetheicemakerisservicedor
maintenanceoperationsperformed.Onlyqualifiedservicetechniciansshouldserviceand
maintaintheicemaker. Thismanualshouldbemadeavailabletothetechnicianpriorto
serviceormaintenance.
CONTENTS
PAGE
I. SPECIFICATIONS .................................................................................................... 5
1. KM-150BAF (Air-cooled) ..................................................................................... 5
2. KM-150BWF (Water-cooled) ............................................................................... 6
II. GENERAL INFORMATION ...................................................................................... 7
1. CONSTRUCTION ............................................................................................... 7
[a] KM-150BAF................................................................................................... 7
[b] KM-150BWF.................................................................................................. 8
2. CONTROLLER BOARD...................................................................................... 9
[a] SOLID-STATE CONTROL ............................................................................ 9
[b] CONTROLLER BOARD................................................................................ 9
[c] SEQUENCE ................................................................................................ 16
[d] CONTROLS AND ADJUSTMENTS ........................................................... 18
[e] CHECKING THE CONTROLLER BOARD ................................................. 21
3. SWITCHES ....................................................................................................... 24
III. TECHNICAL INFORMATION ............................................................................... 25
1. WATER CIRCUIT AND REFRIGERANT CIRCUIT.......................................... 25
[a] KM-150BAF (Air-cooled) ............................................................................. 25
[b] KM-150BWF (Water-cooled) ....................................................................... 26
2. WIRING DIAGRAM ........................................................................................... 27
3. TIMING CHART ................................................................................................ 28
4. PERFORMANCE DATA ................................................................................... 30
[a] KM-150BAF (Air-cooled) ............................................................................. 30
[b] KM-150BWF (Water-cooled) ....................................................................... 31
IV. SERVICE DIAGNOSIS ........................................................................................ 32
1. NO ICE PRODUCTION..................................................................................... 32
2. EVAPORATOR IS FROZEN UP....................................................................... 35
3. LOW ICE PRODUCTION .................................................................................. 36
4. ABNORMAL ICE............................................................................................... 36
5. OTHERS ........................................................................................................... 36

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V. REMOVAL AND REPLACEMENT OF COMPONENTS..........................................37
1. SERVICE FOR REFRIGERANT LINES ..............................................................37
[a] REFRIGERANT RECOVERY........................................................................37
[b] EVACUATION AND RECHARGE .................................................................37
2. BRAZING .............................................................................................................38
3. REMOVAL AND REPLACEMENT OF COMPRESSOR......................................39
4. REMOVAL AND REPLACEMENT OF DRIER ....................................................40
5. REMOVAL AND REPLACEMENT OF EXPANSION VALVE..............................41
6. REMOVAL AND REPLACEMENT OF HOT GAS VALVE...................................42
7. REMOVAL AND REPLACEMENT OF EVAPORATOR ......................................43
8. REMOVAL AND REPLACEMENT OF WATER-REGULATING VALVE .................
- WATER-COOLED MODEL ONLY....................................................................44
9. ADJUSTMENT OF WATER-REGULATING VALVE ...............................................
- WATER-COOLED MODEL ONLY....................................................................45
10. REMOVAL AND REPLACEMENT OF THERMISTOR ........................................46
11. REMOVAL AND REPLACEMENT OF FAN MOTOR...............................................
- EXCEPT WATER-COOLED MODEL...............................................................47
12. REMOVAL AND REPLACEMENT OF WATER VALVE ......................................47
13. REMOVAL AND REPLACEMENT OF PUMP MOTOR........................................48
14. REMOVAL AND REPLACEMENT OF FLOAT SWITCH .....................................49
15. REMOVAL AND REPLACEMENT OF SPRAY TUBE.........................................49
VI. CLEANING AND MAINTENANCE INSTRUCTIONS .............................................50
1. PREPARING THE ICEMAKER FOR LONG STORAGE......................................50
2. CLEANING AND SANITIZING PROCEDURES ..................................................52
[a] CLEANING PROCEDURE ............................................................................52
[b] SANITIZING PROCEDURE...........................................................................54
3. MAINTENANCE...................................................................................................55

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I. SPECIFICATIONS
1. KM-150BAF

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2. KM-150BWF

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II. GENERAL INFORMATION
1. CONSTRUCTION
[a] KM-150BAF

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[b] KM-150BWF

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2. CONTROLLER BOARD
[a] SOLID-STATE CONTROL
1) A HOSHIZAKI exclusive solid-state control is employed in KM-150BAF and
KM-150BWF Crescent Cubers.
2) A Printed Circuit Board (hereafter called “Controller Board”) includes a stable and
high quality control system.
3) All models are pretested and factory-adjusted.
[b] CONTROLLER BOARD
CAUTION
1. Fragile, handle very carefully.
2. A controller board contains integrated circuits, which are susceptible to
failure due to static discharge. It is especially important to touch the
metal part of the unit when handling or replacing the board.
3. Do not touch the electronic devices on the board or the back of the board
to prevent damage to the board.
4. Do not change wiring and connections. Especially, never misconnect
K3, K4 and K5, because the same connector is used for the Thermistor
and Float Switch. K4 is not connected.
5. Do not fix the electronic devices or parts on the board in the field.
Always replace the whole board assembly when it goes bad.
6. Do not short out power supply to test for voltage.

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KM-150B_F models use either the Alpine Controller Board (orange):
PART NUMBER TYPE
2U0127-01 MY9KM910 (Alpine)
MY9KM91B (Alpine)
OR the Control Products Board (green):
PART NUMBER TYPE
2A0836-01 HOSHIZAKI 001 (Control Products - 8 Pin)
OR the Control Products Improved “E” Board (green):
PART NUMBER TYPE
2A1410-01 HOS-001A (Control Products - 10 Pin)
Features of All Three Controller Boards
(1) Maximum Water Supply Period - 6 minutes
Water Solenoid Valve opening, in the Defrost (Harvest) Cycle, is limited by
maximum period of the defrost timer. The Water Valve cannot remain open
longer than the maximum period. The Water Valve can close in less than the
maximum period if the defrost cycle is completed.
(2) Defrost Timer
The defrost cycle starts when the Float Switch opens and completes the
freeze cycle. But the Defrost Timer does not start counting until the Thermistor
senses 48°F at the Evaporator outlet. The period from the end of the freeze
cycle up to the point of the Thermistor's sensing varies depending on the
ambient and water temperatures.
(3) High Temperature Safety - 127 ± 7°F
The temperature of the suction line in the refrigerant circuit is limited by the
High Temperature Safety.
During the defrost cycle the Evaporator temperature rises. The Thermistor
senses 48°F and starts the Defrost Timer. After the Defrost Timer counts
down to zero, the normal freeze cycle begins. If the Evaporator temperature
continues to rise, the Thermistor will sense the rise in temperature and at 127
± 7°F the Thermistor operates the High Temperature Safety.