Hoshizaki KM-650MAH-E User manual

Category
Ice cube makers
Type
User manual

This manual is also suitable for

Hoshizaki
“A Superior Degree
of Reliability”
www.hoshizaki.com
Models
KM-320MAH-E
KM-515MAH-E
KM-650MAH-E
Modular Crescent Cuber
Hoshizaki America, Inc.
SERVICE MANUAL
Number: 73170
Issued: 11-13-2008
Revised: 3-22-2012
89/336
73/23
2
WARNING
Only qualied service technicians should install and service the icemaker. To
obtain the name and phone number of your local Hoshizaki Certied Service
Representative, visit www.hoshizaki-europe.com. No service should be undertaken
until the technician has thoroughly read this Service Manual. Failure to service and
maintain the icemaker in accordance with this manual will adversely affect safety,
performance, component life, and warranty coverage and may result in costly water
damage. Proper installation is the responsibility of the installer. Product failure or
property damage due to improper installation is not covered under warranty.
Hoshizaki provides this manual primarily to assist qualied 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 the appropriate
Hoshizaki Service Office:
UK/Ireland - Hoshizaki UK
TEL : +44 (0)845 456 0585
FAX: +44 (0)132 283 8331
Holland - Hoshizaki Europe
TEL : +31 (0)20 6918499
FAX: +31 (0)20 6918768
Belgium/Luxemburg - Hoshizaki Belgium
TEL : +32 (0)2 7123030
FAX: +32 (0)2 7123031
Germany/Switzerland/Austria - Hoshizaki Deutschland
TEL : +49 (0)2154 92810
FAX: +49 (0)2154 928128
France - Hoshizaki France
TEL : +33 (0)1 48639380
FAX: +33 (0)1 48639388
Other countries - Hoshizaki Europe
TEL: +31 (0)20 6918499
FAX: +31 (0)20 6918768
Web Site: www.hoshizaki-europe.com
NOTE: To expedite assistance, all correspondence/communication MUST include the
following information:
•ModelNumber________________________
•SerialNumber________________________
•Completeanddetailedexplanationoftheproblem.
3
CONTENTS
Important Safety Information ................................................................................................. 5
I. Specications ...................................................................................................................... 7
A. KM-320MAH-E ............................................................................................................. 7
B. KM-515MAH-E .............................................................................................................. 8
C. KM-650MAH-E .............................................................................................................. 9
II. General Information ......................................................................................................... 10
A. Construction ................................................................................................................ 10
1. KM-320MAH-E ....................................................................................................... 10
2. KM-515MAH-E .......................................................................................................11
3. KM-650MAH-E ...................................................................................................... 12
B. Sequence of Operation ............................................................................................... 13
1. Sequence Cycles and Shutdown ........................................................................... 13
a) "E" Control Board ............................................................................................. 13
b) "G" Control Board ............................................................................................ 15
2. Sequence Flow Chart ............................................................................................ 17
a) "E" Control Board: ............................................................................................ 17
b) "G" Control Board: ............................................................................................ 18
C. Control Board .............................................................................................................. 19
1. Control Board Layout ............................................................................................. 20
a) "E" Control Board ............................................................................................ 20
b) "G" Control Board ........................................................................................... 21
2. LED Lights and Audible Alarm Safeties ................................................................. 22
a) "E" Control Board ............................................................................................ 22
b) "G" Control Board ........................................................................................... 23
3. Controls and Adjustments ...................................................................................... 24
a) Default Dip Switch Settings ............................................................................... 24
b) Harvest Timer (S4 dip switch 1 & 2) ................................................................. 25
c) Pump-Out Timer (S4 dip switch 3 & 4) .............................................................. 25
d) Pump-Out Frequency Control (S4 dip switch 5 & 6) ......................................... 26
e) Bin Control Selector/Harvest Pump Timer (S4 dip switch 7) ............................. 26
f) Factory Use (S4 dip switch 8) ............................................................................ 27
g) Freeze Timer (S4 dip switch 9 & 10) ................................................................. 27
h) Float Switch Selector (S5 dip switch 1): "G" Control Board .............................. 28
i) Rell Counter (S5 dip switch 2 through 5): "G" Control Board ........................... 28
D. Control Switch ............................................................................................................. 28
IMPORTANT
This manual should be read carefully before the icemaker is serviced. Read
the warnings and guidelines contained in this booklet carefully as they provide
essential information for the continued safe use, service, and maintenance of the
icemaker. Retain this booklet for any further reference that may be necessary.
4
III. Technical Information ...................................................................................................... 29
A. Water Circuit and Refrigeration Circuit ........................................................................ 29
B. Wiring Diagram ............................................................................................................ 30
1. Thermostatic Bin Control ....................................................................................... 30
2. Mechanical Bin Control ......................................................................................... 31
C. Performance Data ....................................................................................................... 32
1. KM-320MAH-E ....................................................................................................... 32
2. KM-515MAH-E ...................................................................................................... 33
3. KM-650MAH-E ...................................................................................................... 34
IV. Service Diagnosis ........................................................................................................... 35
A. Diagnostic Procedure .................................................................................................. 35
B. Control Board Check ................................................................................................... 39
C. Bin Control Check ....................................................................................................... 40
1. Thermostatic Bin Control Check ............................................................................ 40
2. Mechanical Bin Control Check and Cleaning ....................................................... 41
a) Mechanical Bin Control Check .......................................................................... 41
b) Mechanical Bin Control Cleaning ...................................................................... 42
D. Float Switch Check and Cleaning ............................................................................... 43
1. Float Switch Check ................................................................................................ 43
2. Float Switch Cleaning ............................................................................................ 44
E. Thermistor Check ........................................................................................................ 45
F. Diagnostic Charts ........................................................................................................ 46
1. No Ice Production ................................................................................................... 46
2. Freeze-Up .............................................................................................................. 47
3. Low Ice Production ................................................................................................ 49
V. Replacement of Components .......................................................................................... 50
A. Service for Refrigerant Lines ....................................................................................... 50
1. Refrigerant Recovery ............................................................................................. 50
2. Brazing .................................................................................................................. 51
3. Evacuation and Recharge (R-404A) ...................................................................... 52
B. Important Notes for Component Replacement ............................................................ 53
VI. Cleaning and Maintenance ............................................................................................ 54
A. Cleaning and Sanitizing Instructions ........................................................................... 54
1. Cleaning Procedure ................................................................................................ 55
2. Sanitizing Procedure - Following Cleaning Procedure ........................................... 56
B. Maintenance ................................................................................................................ 57
C. Preparing the Icemaker for Periods of Non-Use .......................................................... 58
VII. Disposal ......................................................................................................................... 59
5
Important Safety Information
Throughout this manual, notices appear to bring your attention to situations which could
result in death, serious injury, damage to the icemaker, or damage to property.
WARNING Indicates a hazardous situation which could result in death or
serious injury.
NOTICE Indicates a situation which could result in damage to the
icemaker or property.
IMPORTANT Indicates important information about the use and care of the
icemaker.
WARNING
This icemaker should be destined only to the use for which it has been expressly
conceived. Any other use should be considered improper and therefore dangerous.
The manufacturer cannot be held responsible for injury or damage resulting from
improper, incorrect, and unreasonable use. Failure to service and maintain the
icemaker in accordance with this manual will adversely affect safety, performance,
component life, and warranty coverage and may result in costly water damage.
To reduce the risk of death, electric shock, serious injury, or re, follow basic
precautions including the following:
•Onlyqualiedservicetechniciansshouldinstallandservicethisicemaker.
•Electricalconnectionmustmeetnational,state,andlocalelectricalcode
requirements. Failure to meet these code requirements could result in death,
electric shock, serious injury, re, or severe damage to equipment.
•Thisicemakerrequiresanindependentpowersupplyofpropercapacity.Seethe
nameplate for electrical specications. Failure to use an independent power supply
of proper capacity can result in a tripped breaker, blown fuses, damage to existing
wiring, or component failure. This could lead to heat generation or re.
THE ICEMAKER MUST BE EARTHED (GROUNDED). 220-240VAC UK and the
Republic of Ireland: This appliance is equipped with a non-rewirable BSI BS-1363
three-prong 13A fused earthing (grounding) plug
to reduce the risk of potential
shock hazards. It must be plugged into a properly earthed (grounded), independent
3-prong mains socket. If the mains socket is not compatible, it is your personal
responsibility to have a qualied electrician replace it with a properly earthed
(grounded), independent, compatible 3-prong mains socket. Do not remove the
earth (ground) prong or fuse from the plug and do not use an adapter plug. The
BSI BS-1363 three-prong 13A fused earthing (grounding) plug must never be used
without a fuse cover being tted. Failure to follow these instructions may result in
death, electric shock, or re.
220-240VAC Continental: If the power cord and/or non-rewirable plug should need
to be tted or replaced, it should only be done by a qualied service technician.
Failure to follow these instructions may result in death, electric shock, or re.
•Toreducetheriskofelectricshock,donottouchthecontrolswitchorplugwith
damp hands.
6
WARNING, continued
•Beforeservicingtheicemaker,movethecontrolswitchtothe"OFF"position.
Unplug the icemaker from the mains socket.
•Donotuseanextensioncord.
•Donotuseanicemakerwithadamagedpowercord.Thepowercordshouldnotbe
altered, jerked, bundled, weighed down, pinched, or tangled. Such actions could
result in electric shock or re. To unplug the icemaker, be sure to pull the plug, not
the cord, and do not jerk the cord.
•TheGREEN/YELLOWearth(ground)wireinthefactory-installedpowercordis
connected to the icemaker. If it becomes necessary to remove or replace the
power cord, be sure to connect the power cord's earth (ground) wire.
•Donotmakeanyalterationstotheicemaker.Alterationscouldresultinelectric
shock, injury, re, or damage to the icemaker.
•Thisapplianceisnotintendedforusebypersons(includingchildren)withreduced
physical, sensory, or mental capabilities, or lack of experience and knowledge,
unless they have been given supervision or instruction concerning use of the
appliance by a person responsible for their safety.
•Childrenshouldbeproperlysupervisedaroundthisappliance.
•Donotclimb,stand,orhangontheicemakerorallowchildrenoranimalstodoso.
Serious injury could occur or the icemaker could be damaged.
•Donotusecombustiblesprayorplacevolatileorammablesubstancesnearthe
icemaker. They might catch re.
•Keeptheareaaroundtheicemakerclean.Dirt,dust,orinsectsintheicemaker
could cause harm to individuals or damage to the icemaker.
NOTICE
•Followtheinstructionsinthismanualcarefullytoreducetheriskofcostlywater
damage.
•Inareaswherewaterdamageisaconcern,installinacontainedareawithaoor
drain.
•Installtheicemakerinalocationthatstaysabovefreezing.Normaloperating
ambient temperature must be within 45°F to 100°F (7°C to 38°C).
•Donotleavetheicemakeronduringextendedperiodsofnon-use,extended
absences, or in sub-freezing temperatures. To properly prepare the icemaker for
these occasions, follow the instructions in "VI.C. Preparing the Icemaker for Periods
of Non-Use."
•Donotplaceobjectsontopoftheicemaker.
•Thestoragebinisforiceuseonly.Donotstoreanythingelseinthestoragebin.
7
I. Specications
A. KM-320MAH-E
Note: We reserve the right to make changes in specications and design without prior
notice.
AC SUPPLY VOLTAGE 220-240/50/1
AMPERAGE 3.5 A (5 Min. Freeze at 109°F/WT 59°F)
MINIMUM CIRCUIT AMPACITY 15 A
MAXIMUM FUSE SIZE 15 A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp. (°F) 50 70 90
lbs./day (kg/day) 70 *293 (133) 275 (125) 255 (116)
Reference without *marks 80 279 (127) 252 (114) 234 (106)
90 275 (125) *232 (105) 213 (97)
100 273 (124) 228 (103) 196 (89)
FOR THE EUROPEAN MARKET 10/10°C 20/15°C 30/25°C
ICE CAPACITY lbs./day (kg/day) 346 (157) 303 (137) 236 (107)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 8 lbs. (3.6 kg) 360pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 710 (7.3) 650(5.3)
WATER gal./24HR (gal./100 lbs.) 52(22.2) 117(40.1)
EXTERIOR DIMENSIONS (WxDxH) 22"x27-3/8"x30-5/16" (560x695x770 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 153 lbs. (69 kg), Shipping 175 lbs. (79 kg)
CONNECTIONS - ELECTRIC Power Cord - Connection
- WATER SUPPLY Inlet 1/2" FPT
- DRAIN Outlet 3/4" FPT
3/8" OD Hard Tube
CUBE CONTROL SYSTEM Float Switch
HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer
ICE MAKING WATER CONTROL Timer Controlled. Overflow Pipe
COOLING WATER CONTROL N/A
BIN CONTROL SYSTEM Thermostatic or Mechanical Bin Control
COMPRESSOR Hermetic, Model ASE32C3E-CAZ-254
CONDENSER Air-Cooled , Fin and tube type
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R404A, 1 lb. 4.3 oz. (575g)
DESIGN PRESSURE High 467PSIG, Low 230PSIG
P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-out ( Internal )
COMPRESSOR PROTECTION Auto-reset Overload Protector ( Internal )
REFRIGERANT CIRCUIT PROTECTION Auto-reset High Pressure Control Switch
LOW WATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED N/A
-REQUIRED Ice Storage Bin
OPERATING CONDITIONS VOLTAGE RANGE 198 - 254 V
AMBIENT TEMP. 45 -100° F
WATER SUPPLY TEMP. 45 - 90° F
WATER SUPPLY PRESSURE 10 - 113 PSIG
ENG.F-011.1.0205
8
B. KM-515MAH-E
Note: We reserve the right to make changes in specications and design without prior
notice.
AC SUPPLY VOLTAGE 220-240/50/1
AMPERAGE 7.14 A ( 5 Min. Freeze AT 109°F / WT 59°F)
MINIMUM CIRCUIT AMPACITY 15A
MAXIMUM FUSE SIZE 15 A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *513 (233) 482 (219) 441 (200)
Reference without *marks 80 490 (222) 442 (200) 401 (182)
90 482 (219) *408 (185) 366 (166)
100 474 (215) 398 (181) 328 (149)
FOR THE EUROPEAN MARKET 10/10°C 21/15°C 30/25°C
ICE CAPACITY lbs./day ( kg/day ) 582 (264) 528 (239) 406 (184)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 10.2 lbs. (4.6 kg) 480pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 1200(7.1) 1080(5.1)
WATER gal./24HR (gal./100 lbs.) 108(26.5) 159(31.1)
EXTERIOR DIMENSIONS (WxDxH) 22" x 27-3/8" x 30-5/16" (560 x 695 x 770 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 151 lbs. (68 kg), Shipping 175 lbs. (79 kg)
CONNECTIONS - ELECTRIC Power Cord - Connection
- WATER SUPPLY Inlet 1/2" FPT
- DRAIN Outlet 3/4" FPT
3/8" OD Hard Tube
CUBE CONTROL SYSTEM Float Switch
HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer
ICE MAKING WATER CONTROL Time Controlled. Overflow Pipe
COOLING WATER CONTROL N/A
BIN CONTROL SYSTEM Thermostatic or Mechanical Bin Control
COMPRESSOR Hermetic, Model RST64C1E-CAZ-202
CONDENSER Air-Cooled , Fin and Tube Type
EVAPORATOR Vertical Type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R404A, 1 lb. 2.5 oz. L33 (525g)
DESIGN PRESSURE High 467PSIG, Low 230PSIG
P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-Out ( Internal )
COMPRESSOR PROTECTION Auto-Reset Protector ( Internal )
REFRIGERANT CIRCUIT PROTECTION Auto-Reset High-Pressure Switch
LOW WATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED N/A
-REQUIRED Ice Storage Bin
OPERATING CONDITIONS VOLTAGE RANGE 198-254VAC
AMBIENT TEMP. 45 -100° F
WATER SUPPLY TEMP. 45 - 90° F
WATER SUPPLY PRESSURE 10 - 113 PSIG
ENG.F-011.1.0205
9
C. KM-650MAH-E
Note: We reserve the right to make changes in specications and design without prior
notice.
AC SUPPLY VOLTAGE 220-240/50/1
AMPERAGE 6.8 A ( 5 Min. Freeze AT 109°F / WT 59°F)
MINIMUM CIRCUIT AMPACITY 15 A
MAXIMUM FUSE SIZE 15 A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *653 (296) 610 (277) 558 (253)
Reference without *marks 80 620 (281) 554 (251) 506 (229)
90 610 (277) *507 (230) 456 (207)
100 602 (273) 495 (225) 409 (186)
FOR THE EUROPEAN MARKET 10/10°C 20/15°C 30/25°C
ICE CAPACITY lbs./day (kg/day) 734 (333) 603 (274) 535 (243)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 14 lbs. (6.4 kg) 720pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 1200(5.7) 1090(4.0)
WATER gal./24HR (gal./100 lbs.) 94(18.5) 162(24.8)
EXTERIOR DIMENSIONS (WxDxH) 22" x 27-3/8" x 37-7/16" (560 x 695 x 950 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 169 lbs. (77 kg), Shipping 200 lbs. (91 kg)
CONNECTIONS - ELECTRIC Power Cord - Connection
- WATER SUPPLY Inlet 1/2" FPT
- DRAIN Outlet 3/4" FPT
3/8" OD Hard Tube
CUBE CONTROL SYSTEM Float Switch
HARVESTING CONTROL SYSTEM Hot Gas and Water, Thermistor and Timer
ICE MAKING WATER CONTROL Time Controlled. Overflow Pipe
COOLING WATER CONTROL N/A
BIN CONTROL SYSTEM Thermostatic or Mechanical Bin Control
COMPRESSOR Hermetic, Model RST64C1E-CAZ-202
CONDENSER Air-Cooled , Fin and Tube Type
EVAPORATOR Vertical Type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R404A, 1 lb. 6.6 oz. (640g)
DESIGN PRESSURE High 467PSIG, Low 230PSIG
P.C. BOARD CIRCUIT PROTECTION High Voltage Cut-Out ( Internal )
COMPRESSOR PROTECTION Auto-Reset Protector ( Internal )
REFRIGERANT CIRCUIT PROTECTION Auto-Reset High-Pressure Switch
LOW WATER PROTECTION Float Switch
ACCESSORIES -SUPPLIED N/A
-REQUIRED Ice Storage Bin
OPERATING CONDITIONS VOLTAGE RANGE 198-254VAC
AMBIENT TEMP. 45 -100° F
WATER SUPPLY TEMP. 45 - 90° F
WATER SUPPLY PRESSURE 10 - 113 PSIG
ENG.F-011.1.0205
10
II. General Information
A. Construction
1. KM-320MAH-E
Thermostatic Bin Control
Auxiliary Code U-0 and Earlier
Control Switch
Expansion Valve
Compressor
Float Switch
Water Pump
Control Box
Drier
Fan Motor
Hot Gas Valve
Condenser
Water Supply Pipe
Spray Tubes
Main Transformer
(230V115V)
High-Pressure
Switch
Strainer
Thermistor
Evaporator
Inlet Water Valve
Power Cord with
Fused Plug
(250V, 13A fuse)
Mechanical Bin Control
Auxiliary Code U-1 and Later
U-0 and Earlier
U-1 and Later
11
2. KM-515MAH-E
Main Transformer
(230V115V)
Control Switch
Expansion Valve
Compressor
Float Switch
Water Pump
Control Box
Drier
Fan Motor
Hot Gas Valve
Condenser
Water Supply Pipe
Spray Tubes
High-Pressure
Switch
Strainer
Thermistor
Liquid Line Valve
Evaporator
Inlet Water Valve
Thermostatic Bin Control
Auxiliary Code U-1 and Earlier
Mechanical Bin Control
Auxiliary Code U-2 and Later
U-1 and Later
U-0 and Earlier
Power Cord with
Fused Plug
(250V, 13A fuse)
12
3. KM-650MAH-E
Main Transformer
(230V115V)
Control Switch
Thermostatic
Expansion Valve
Compressor
Float Switch
Water Pump
Control Box
Drier
Fan Motor
Hot Gas Valve
Condenser
Water Supply Pipe
Spray Tubes
High-Pressure
Switch
Strainer
Thermistor
Evaporator
Inlet Water Valve
Thermostatic Bin Control
Auxiliary Code U-0 and Earlier
Mechanical Bin Control
Auxiliary Code U-1 and Later
U-1 and Later
U-0 and Earlier
Power Cord with
Fused Plug
(250V, 13A fuse)
13
B. Sequence of Operation
1. Sequence Cycles and Shutdown
a) "E" Control Board
KM-320MAH-E and KM-650MAH-E Auxiliary Code U-0 and Earlier
KM-515MAH-E Auxiliary Code U-1 and Earlier
The steps in the sequence are as outlined below. When power is supplied, CB red
"POWER OK" LED comes on. There is a 5-second delay before startup. Note that the
order of the component LEDs from the outer edge of CB is 1, 4, 3, 2.
(1) 1-Minute Fill Cycle
LED 4 is on. WV energizes and the ll period begins. After 1 minute, CB checks for
a closed F/S. If F/S is closed, the harvest cycle begins. If not, WV remains energized
through additional 1-minute ll cycles until water enters the water tank and F/S closes.
This serves as a low water safety to protect PM.
(2) Initial Harvest Cycle
LEDs 1, 4, and 2 are on. WV remains energized, Comp and HGV energize. CB
monitors the warming of the evaporator via the thermistor located on the suction line.
When the thermistor reaches 48°F (9°C), CB reads 3.9 kΩ from the thermistor and
turns harvest termination over to the adjustable harvest timer (S4 dip switch 1 & 2).
The harvest timer has settings of 60, 90, 120, and 180 seconds. The pump-out timer
(S4 dip switch 3&4) acts in place of the harvest timer during cycles with a pump-out
(S4 dip switch 5&6). WV is energized during harvest for a maximum of 6 minutes or
the length of harvest, whichever is shorter. LED 4 turns off when WVde-energizes.
The minimum total time allowed by CB for a complete harvest cycle is 2 minutes. At
the end of harvest, CB checks position of F/S and proceeds to the freeze cycle if it is
closed or calls for a 1-minute ll if it is open.
(3) Freeze Cycle
LED 1 is on. Comp remains energized, PM, FM, and LLV(KM-515MAH-E) energize.
HGV and WV de-energize. For the rst 5 minutes, CB will not terminate the freeze
cycle. This minimum 5-minute freeze time is short cycle protection for Comp. As ice
builds on the evaporator, the water level in the water tank lowers. Freeze continues
until F/S opens, provided the 5-minute minimum freeze timer has terminated.
14
(4) Pump-Out Cycle
LEDs 1, 3, and 2 are on. Comp remains energized. HGV energizes. WV energizes if
S4 dip switch 3 off and 4 on (LED 4 on). LLV (KM-515MAH-E) and FM de-energize.
PM stops for 2 seconds then reverses for 10 or 20 seconds (S4 dip switch 3 & 4).
Water is removed from the bottom of the water tank through the check valve and
downthedrain.Atthesametime,waterowsthroughthesmallF/Stubetopower
ushF/S.Whenthepump-outtimerterminates,pump-outiscomplete.
The 1st pump-out occurs after the 1st freeze cycle, then every 10th cycle
thereafter(KM-320MAH-E) or every cycle thereafter (KM-515MAH-E and
KM-650MAH-E). The pump-out frequency control is factory set, and generally no
adjustment is required. However, the pump-out frequency control (S4 dip switch 5 &
6) can be set to have a pump-out occur every cycle, or every 2, 5, or 10 cycles. For
details, see "II.C.3.d) Pump-Out Frequency Control (S4 dip switch 5 & 6)."
(5) Harvest Cycle
LEDs 1, 4, and 2 are on. Same as the initial harvest cycle. See "II.B.1.a)(2) Initial
Harvest Cycle."
Note: Icemaker continues to cycle until TBC is satised or power is turned off. The
icemaker always restarts at the 1-minute ll cycle.
(6) Shutdown
When ice contacts the thermostatic bulb (TBC switch open), TBC shuts down the
icemaker within 10 seconds. TBC is factory set, and generally no adjustment is
required. However, adjustment may be needed in some conditions, particularly at
higher altitude locations. NOTICE! Do not adjust S4 dip switch 7 out of the factory
default position. This dip switch must be left in the factory default position or
this icemaker will not operate correctly.
Legend: CB–control board; Comp–compressor; FM–fan motor; F/S–oatswitch;HGV–hot
gas valve; L LV–liquid line valve (KM-515MAH-E); PM–pump motor;
TBC–thermostatic bin control; WV–inlet water valve
15
b) "G" Control Board
KM-320MAH-E and KM-650MAH-E Auxiliary Code U-1 and Later
KM-515MAH-E Auxiliary Code U-2 and Later
The steps in the sequence are as outlined below. When power is supplied, the red
"POWER OK" LED and the green "BC CLOSED" LED on CB turn on (If yellow
"BC OPEN" LED is on, the icemaker will not start. In this case clear ice away from BC
actuator paddle in the storage bin area). A 5-second delay occurs at startup. Note that
the order of the green sequence LEDs from the outer edge of the board is 1, 4, 3, 2.
(1) 1-Minute Fill Cycle
LED 4 is on. WV energizes and the ll period begins. After 1 minute, CB checks for
a closed F/S. If F/S is closed, the harvest cycle begins. If not, WV remains energized
through additional 1-minute ll cycles until water enters the water tank and F/S closes.
This serves as a low water safety to protect PM.
(2) Initial Harvest Cycle
LEDs 1, 4, and 2 are on. WV remains energized, Comp and HGV energize. CB
monitors the warming of the evaporator via the thermistor located on the suction line.
When the thermistor reaches 48°F (9°C), CB reads 3.9 kΩ from the thermistor and
turns harvest termination over to the adjustable harvest timer (S4dip switch 1 & 2).
The harvest timer has settings of 60, 90, 120, and 180 seconds. The pump-out timer
(S4 dip switch 3&4) acts in place of the harvest timer during cycles with a pump-out
(S4 dip switch 5&6). WV is energized during harvest for a maximum of 6 minutes
or the length of harvest, whichever is shorter. NOTICE! Do not adjust S4 dip switch
7 out of the factory default position. This dip switch must be left in the factory
default position or this icemaker will not operate correctly. For details, see
"II.C.3.e) Bin Control Selector/Harvest Pump Timer (S4 dip switch 7)." LED 4 turns
off when WV de-energizes. The minimum total time allowed by CB for a complete
harvest cycle is 2 minutes. At the end of harvest, CB checks position of F/S and
proceeds to the freeze cycle if it is closed or calls for a 1-minute ll if it is open.
(3) Freeze Cycle
LED 1 is on. Comp remains energized, PM, FM, and LLV(KM-515MAH-E) energize.
HGV and WV de-energize. For the rst 5minutes, CB will not terminate the freeze
cycle. At the end of 5 minutes, F/S assumes control of the freeze cycle. As ice builds
on the evaporator, the water level in the water tank lowers. Freeze continues until
F/S opens, provided the 5-minute minimum freeze timer has terminated. There is a
15second delay before CB acknowledges an open F/S.
16
(4) Pump-Out Cycle
LEDs 1, 3, and 2 are on. Comp remains energized. HGV energizes. WV energizes if
S4 dip switch 3 off and 4 on (LED 4 on). LLV (KM-515MAH-E) and FM de-energize.
PM stops for 2 seconds then reverses for 10 or 20 seconds (S4 dip switch 3 & 4).
Water is removed from the bottom of the water tank through the check valve and
downthedrain.Atthesametime,waterowsthroughthesmallF/Stubetopower
ushF/S.Whenthepump-outtimerterminates,pump-outiscomplete.
The 1st pump-out occurs after the 11th freeze cycle, then every 10th cycle thereafter
(KM-320MAH-E) or every cycle thereafter (KM-515MAH-E and the KM-650MAH-E).
The pump-out frequency control is factory set, and generally no adjustment is
required. However, the pump-out frequency control (S4 dip switch 5 & 6) can be set
to have a pump-out occur every cycle, or every 2, 5, or 10 cycles. For details, see
"II.C.3.d) Pump-Out Frequency Control (S4 dip switch 5 & 6)."
"G" Control Board Settings
S4 Dip Switch Setting
Pump-Out
Frequency
1st Pump-Out
No. 5 No. 6
OFF OFF Every cycle After 2nd freeze cycle
ON OFF Every 2 cycles After 3rd freeze cycle
OFF ON Every 5 cycles After 6th freeze cycle
ON ON Every 10 cycles After 11th freeze cycle
(5) Harvest Cycle
LEDs 1, 4, and 2 are on. Same as the initial harvest cycle. See "II.B.1.b)(2) Initial
Harvest Cycle."
Note: Icemaker continues to cycle until MBC is satised or power is turned off. The
icemaker always restarts at the 1-minute ll cycle.
(6) Shutdown
When MBC is activated (MBC open), the yellow "BC OPEN" LED comes on. The
icemaker then shuts down as outlined in the table below.
Cycle at
Mechanical Bin
Control Activation
Shutdown
Fill Cycle 15 seconds after activation.
Harvest Cycle At the end of the harvest cycle, or up to 15 seconds into the freeze cycle if activated
at the end of the harvest cycle.
Freeze Cycle 15 seconds after activation if activated at least 15 seconds before the 5-minute short
cycle protection timer terminates. Otherwise, at the end of the next harvest cycle.
Legend: CB–control board; Comp–compressor; FM–fan motor; F/S–oatswitch;
HGV–hot gas valve; L LV–liquid line valve (KM-515MAH-E); MBC–mechanical bin
control; PM–pump motor; WV–inlet water valve
17
2. Sequence Flow Chart
a) "E" Control Board:
KM-320MAH-E and KM-650MAH-E Auxiliary Code U-0 and Earlier
KM-515MAH-E Auxiliary Code U-1 and Earlier
•Maximuminletwatervalvetime:6min.
•Maximumharvesttime:20min.
Components Energized when the Control Switch is in the "WASH" Position
The "WASH" position on the control switch is used when cleaning and sanitizing the icemaker. When in
the "WASH" position, power is supplied to the pump motor. With the cleaning valve closed, the cleaner and
sanitizerowovertheoutsideoftheevaporatorplateassembly.Withthecleaningvalveopen,thecleanerand
sanitizerowoverboththeoutsideandtheinsideoftheevaporatorplateassembly.
Note: Close the cleaning valve after cleaning and sanitizing are complete, otherwise the icemaker will not
restart when the control switch is placed in the "ICE" position.
Legend:
Comp–compressor
FM–fan motor
F/S–oatswitch
HGV–hot gas valve
LLV–liquid line valve (KM-515MAH-E)
PM–pump motor
TBC–themostatic bin control
WV–inlet water valve
1. Bin Full
Within 10 sec.
after ice contacts
TBC bulb,
icemaker shuts
down.
Shutdown
and Restart
TBC
Operation
Ice contacts TBC bulb
2. Icemaker Off
All components
de-energized.
3. Ice Level Lowered
No ice touching
TBC bulb.
Icemaker starts at
"1. 1-Minute Fill Cycle."
TBC closed
TBC open
All components
de-energized
To 1 above
F/S check
1 to 3-min. harvest
timer in control
(S4 dip switch 1 & 2)
"E" Control Board Sequence Flow Chart
1. 1-Minute
Fill Cycle
Cycle
Steps
2. Harvest Cycle
Thermistor
in control
3. Freeze Cycle
•Minimumfreezetime:5min.
•Maximumfreezetime:freeze
timer setting
(S4 dip switch 9 & 10)
F/S in control
4. Pump-Out Cycle
•Factorysetforevery
10th cycle (S4 dip
switch 5 & 6)
•Pumpmotorstops
for 2 sec., then
reverses for 10/20
sec. (S4 dip switch
3 & 4)
WV energized
F/S open
WV continues
Comp energized
HGV energized
Thermistor temperature
reaches 48°F (9°C) (3.9
kΩ or less). Harvest
timer starts (1 to 3 min.).
F/S open
Comp continues
FM energized
LLV energized
PM energized
HGV de-energized
WV de-energized
F/S closed
Comp continues
HGV energized
WV energized (dependent on
pump-out timer setting)
PM de-energizes for 2 sec.,
then reverses for 10/20 sec.
FM de-energized
LLV de-energized
F/S check
Startup
If F/S is open, Comp stops and cycle returns to 1-min. ll.
5-min.
minimum
freeze timer in
control
F/S closed
F/S open or
freeze timer
terminates
KM-320MAH-E, KM-515MAH-E, KM-650MAH-E
18
b) "G" Control Board:
KM-320MAH-E and KM-650MAH-E Auxiliary Code U-1 and Later
KM-515MAH-E Auxiliary Code U-2 and Later
1 to 3-min. harvest timer in
control (S4 dip switch 1 & 2)
•Maximuminletwatervalvetime:6min.
•Maximumharvesttime:20min.
F/S check
Legend:
Comp–compressor
FM–fan motor
F/S–oatswitch
HGV–hot gas valve
LLV–liquid line valve (KM-515MAH-E)
MBC–mechanical bin control
PM–pump motor
WV–inlet water valve
Components Energized when the Control Switch is in the "WASH" Position
The "WASH" position on the control switch is used when cleaning and sanitizing the icemaker. When in the "WASH"
position,powerissuppliedtothepumpmotor.Withthecleaningvalveclosed,thecleanerandsanitizerowoverthe
outsideoftheevaporatorplateassembly.Withthecleaningvalveopen,thecleanerandsanitizerowoverboththe
outside and the inside of the evaporator plate assembly.
Note: Close the cleaning valve after cleaning and sanitizing are complete, otherwise the icemaker will not restart
when the control switch is placed in the "ICE" position.
"G" Control Board Sequence Flow Chart
1. 1-Minute
Fill Cycle
Cycle
Steps
2. Harvest Cycle
Thermistor
in control
3. Freeze Cycle
•Minimumfreezetime:5min.
•Maximumfreezetime:freeze
timer setting
(S4 dip switch 9 & 10)
F/S in control
4. Pump-Out Cycle
•Factorysetforevery
10th cycle (S4 dip
switch 5 & 6)
•Pumpmotorstops
for 2 sec., then
reverses for 10/20
sec. (S4 dip switch
3 & 4)
WV energized
F/S open
WV continues
Comp energized
HGV energized
Thermistor temperature reaches
48°F (9°C) (3.9 kΩ or less).
Harvest timer starts (1 to 3 min.).
F/S open
Comp continues
FM energized
LLV energized
PM energized
HGV de-energized
WV de-energized
F/S closed
Comp continues
HGV energized
WV energized (dependent on
pump-out timer setting)
PM de-energizes for 2 sec.,
then reverses for 10/20 sec.
FM de-energized
LLV de-energized
F/S check
Startup
If F/S is open, Comp stops and cycle returns to 1-min. ll.
1. Bin Full
Shutdown Delay:
•Fill Cycle–15 sec. after activation.
•Harvest Cycle–At the end of the harvest cycle, or up to 15 sec. into the
freeze cycle if activated at the end of the harvest cycle.
•Freeze Cycle–15 sec. after activation if activated at least 15 sec. before
the 5-min. short cycle protection timer terminates
Otherwise, at the end of the next harvest cycle.
Shutdown
and Restart
MBC Operation
MBC open (MBC actuator paddle engaged)
Green "BC CLOSED" LED off
Yellow"BCOPEN"LEDon
Yellow"BCOPEN"LEDcontinues.
All components de-energized
5-min.
minimum
freeze timer
in control
F/S closed
F/S open or
freeze timer
terminates
2. Icemaker Off
All components
de-energized.
3. Ice Level Lowered
Icemaker starts at
"1. 1-Minute Fill Cycle."
To 1 above
MBC closed
(MBC actuator paddle disengaged)
Green "BC CLOSED" LED on
Yellow"BCOPEN"LEDoff
KM-320MAH-E, KM-515MAH-E, KM-650MAH-E
19
C. Control Board
•A Hoshizaki exclusive control board is employed in Hoshizaki icemakers.
•All models are pretested and factory adjusted.
•For a control board check procedure, see "IV.B. Control Board Check."
NOTICE
•Fragile,handleverycarefully.
•Thecontrolboardcontainsintegratedcircuits,whicharesusceptibletofailure
due to static discharge. It is especially important to touch the metal part of the
icemaker when handling or replacing the control board.
•Donottouchtheelectronicdevicesonthecontrolboardorthebackofthecontrol
board.
•Donotchangewiringandconnections.Donotmisconnectterminals.
•Donotshortoutpowersupplytotestforvoltage.
•Alwaysreplacethewholecontrolboardassemblyifitgoesbad.
20
"E" Control Board
Part Number 2A1410-02
"E" Control Board
1. Control Board Layout
a) "E" Control Board
KM-320MAH-E and KM-650MAH-E Auxiliary Code U-0 and Earlier
KM-515MAH-E Auxiliary Code U-1 and Earlier
Microprocessor
(board revision level
indicated by last
2 digits on label)
• Part Number
• K1 Connector
Pins #1 through #10
#1, 9 Magnetic Contactor
#2 Hot Gas Valve
#3 Fan Motor (all)
Liquid Line Valve
(KM-515MAH-E)
#4 Pump Motor (icemaking)
#5 Pump Motor (pump-out)
#6 Inlet Water Valve
#7, 10 Power Supply Voltage
#8 Open
Switch for "C" control board
and "ALPINE" control board
(service control board only)
Set to "ALP" for icemakers
covered in this manual.
• Freeze Timer
LED (yellow)
• Harvest Backup
Timer LED (orange)
• K2 Connector
Control Transformer
(10.5VAC)
• "ALARM RESET" Button
• S4 Dip Switch
• "OUTPUT TEST" Button
(used to test relays on control board)
• K3 (white) Connector
Harvest Control
(thermistor)
• K4 (red) Connector
Mechanical Bin Control
(open on thermostatic bin
control application)
• K5 (black) Connector
Float Switch
• LED 1 (X1 Relay)
K1 Connector Pin #1, #9
• LED 4 (X4 Relay)
K1 Connector Pin #6
• LED 3 (X3 Relay)
LED 3 on:
K1 Connector Pin #5
LED 3 off:
K1 Connector Pin #4
(energized in freeze)
• LED 2 (X2 Relay)
LED 2 on:
K1 Connector Pin #2
LED 2 off:
K1 Connector Pin #3
• Relay LEDs
(4) (indicate which
relays are energized
and which K1
connector pins are
energized
• Power LED (red)
(lights when
10.5VAC is
supplied to
K2 connector)
Alarm Buzzer
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Hoshizaki KM-650MAH-E User manual

Category
Ice cube makers
Type
User manual
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