Hoshizaki American, Inc. KM-320MAH-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
89/336
73/23
IMPORTANT
Only qualied service technicians should attempt to install, service, or maintain
this icemaker. No service or maintenance should be undertaken until the
technician has thoroughly read this Service Manual. Failure to service and
maintain the equipment in accordance with this manual may adversely affect
safety, performance, and warranty coverage.
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 Ofce:
UK/Ireland - Hoshizaki UK
TEL : +44 (0)845 456 0585
FAX: +44 (0)46 499080
Holland - Hoshizaki Europe
TEL : +3 (0)0 698499
FAX: +3 (0)0 698768
Belgium/Luxemburg - Hoshizaki Belgium
TEL : +3 (0) 73030
FAX: +3 (0) 7303
Germany/Switzerland/Austria - Hoshizaki Deutschland
TEL : +49 (0)54 980
FAX: +49 (0)54 988
France - Hoshizaki France
TEL : +33 (0) 48639380
FAX: +33 (0) 48639388
Other countries - Hoshizaki Europe
TEL: +3 (0)0 698499
FAX: +3 (0)0 698768
Web Site: www.hoshizaki.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
I. Specications ..................................................................................................................... 5
A. KM-30MAH-E (self-contained air-cooled) ...................................................................
5
B. KM-55MAH-E (self-contained air-cooled) ................................................................... 6
C. KM-650MAH-E (self-contained air-cooled) ................................................................... 7
II. General Information ........................................................................................................... 8
A. Dimensions / Connections ............................................................................................ 8
. KM-30MAH-E (self-contained air-cooled) .............................................................. 8
. KM-55MAH-E (self-contained air-cooled) .............................................................. 9
3. KM-650MAH-E (self-contained air-cooled) ............................................................ 0
B. Construction ................................................................................................................ 
. KM-30MAH-E (self-contained air-cooled) ............................................................ 
. KM-55MAH-E (self-contained air-cooled) ............................................................ 
3. KM-650MAH-E (self-contained air-cooled) ............................................................ 3
C. Sequence of Operation ............................................................................................... 4
. One Minute Fill Cycle ............................................................................................ 4
. Initial Harvest Cycle .............................................................................................. 4
3. Freeze Cycle ........................................................................................................ 4
4. Pump-Out Cycle ................................................................................................... 4
5. Normal Harvest Cycle .......................................................................................... 5
D. Control Board ............................................................................................................. 7
. Control Board Layout ............................................................................................ 8
. Features ................................................................................................................ 9
a) Maximum Water Supply Period – 6 minutes ...................................................... 9
b) Harvest Backup Timer and Freeze Timer .......................................................... 9
c) High Temperature Safety ................................................................................... 9
d) Low Water Safety ............................................................................................... 9
e) High Voltage and Low Voltage Cut-outs ............................................................ 9
f) LED Lights and Audible Alarm Safeties .............................................................. 0
3. Controls and Adjustments ..................................................................................... 
a) Default Dip Switch Settings ................................................................................ 
b) Harvest Timer (S4 dip switch  & ) ................................................................... 
c) Pump-Out Timer (S4 dip switch 3 & 4) ............................................................... 
d) Pump-Out Frequency Control (S4 dip switch 5 & 6) .......................................... 3
e) Factory Use (S4 dip switch 7 & 8) ...................................................................... 3
f) Freeze Timer (S4 dip switch 9 & 0) ................................................................... 3
4. Control Board Check Procedure ........................................................................... 4
5. Control Board Replacement .................................................................................. 4
IMPORTANT
This manual should be read carefully before the icemaker is serviced or
maintenance operations are performed. Only qualied service technicians
should install, service, and maintain the icemaker. Read the warnings
contained in this booklet carefully as they give important information regarding
safety. Please retain this booklet for any further reference that may be
necessary.
4
E. Harvest Control – Thermistor ...................................................................................... 4
. Thermistor Check .................................................................................................. 4
F. Float Switch ................................................................................................................ 5
. Float Switch Check ................................................................................................ 5
. Float Switch Cleaning ............................................................................................ 6
G. Bin Control .................................................................................................................. 6
III. Technical Information ..................................................................................................... 7
A. Water Circuit and Refrigeration Circuit ....................................................................... 7
B. Wiring Diagram ........................................................................................................... 8
. KM-30MAH-E (self-contained air-cooled) ............................................................ 8
. KM-55MAH-E (self-contained air-cooled) ............................................................ 9
3. KM-650MAH-E (self-contained air-cooled) ............................................................ 30
C. Performance Data ...................................................................................................... 3
. KM-30MAH-E (self-contained air-cooled) ............................................................ 3
. KM-55MAH-E (self-contained air-cooled) ............................................................ 3
3. KM-650MAH-E (self-contained air-cooled) ............................................................ 33
IV. Service Diagnosis .......................................................................................................... 34
A. 0-Minute Diagnostic Procedure ............................................................................... 34
B. Diagnostic Charts ....................................................................................................... 36
. No Ice Production .................................................................................................. 36
. Evaporator is Frozen Up ....................................................................................... 39
3. Low Ice Production ................................................................................................ 40
4. Abnormal Ice ......................................................................................................... 4
5. Other ..................................................................................................................... 4
V. Removal and Replacement of Components ................................................................... 43
A. Service for Refrigerant Lines ...................................................................................... 43
. Refrigerant Recovery ............................................................................................ 43
. Brazing .................................................................................................................. 43
3. Evacuation and Recharge (R-404A) ..................................................................... 44
B. Removal and Replacement of Compressor ................................................................ 45
C. Removal and Replacement of Expansion Valve......................................................... 46
D. Removal and Replacement of Hot Gas Valve or Liquid Line Valve............................ 47
E. Removal and Replacement of Evaporator .................................................................. 48
F. Removal and Replacement of Condenser .................................................................. 49
G. Removal and Replacement of Thermistor .................................................................. 50
H. Removal and Replacement of Fan Motor ................................................................... 5
I. Removal and Replacement of Inlet Water Valve.......................................................... 5
J. Removal and Replacement of Pump Motor................................................................. 5
VI. Cleaning and Maintenance ........................................................................................... 53
A. Cleaning and Sanitizing Instructions ........................................................................... 53
. Cleaning Procedure ............................................................................................... 53
. Sanitizing Procedure - Following Cleaning Procedure .......................................... 54
B. Maintenance ............................................................................................................... 56
C. Preparing the Icemaker for Long Storage .................................................................. 56
5
I. Specications
A. KM-320MAH-E (self-contained air-cooled)
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" x 27-3/8" x 30-5/16" (560 x 695 x 770 mm)
EXTERIOR FINISH Stainless Steel, Galvanized Steel (Rear)
WEIGHT Net 153 lbs. (69 kg), Shipping 175 lbs. (79 kg)
CONNECTIONS - ELECTRIC Cord - Connection
- WATER SUPPLY Inlet 1/2" FPT
- DRAIN Outlet 3/4" FPT
3/8" OD 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 Thermostat
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
6
B. KM-515MAH-E (self-contained air-cooled)
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
Cord - Connection
- WATER SUPPLY
Inlet 1/2" FPT
- DRAIN Outlet 3/4" FPT
3/8" OD 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 Thermostat
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. (525g)
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
Note: We reserve the right to make changes in specications and design without prior
notice.
7
C. KM-650MAH-E (self-contained air-cooled)
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
Cord - Connection
- WATER SUPPLY
Inlet 1/2" FPT
- DRAIN Outlet 3/4" FPT
3/8" OD 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 Thermostat
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 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
8
II. General Information
A. Dimensions / Connections
1. KM-320MAH-E (self-contained air-cooled)
Unit: inches (mm)
Back View Side View Front View
Bottom View
9
2. KM-515MAH-E (self-contained air-cooled)
Unit: inches (mm)
Back View Side View Front View
Bottom View
0
3. KM-650MAH-E (self-contained air-cooled)
Unit: mm (inches)
Back View
Side View
Front View
Bottom View

Bin Control Thermostat Bulb
(Thermostat Body is in Control Box)
Control Switch
Expansion Valve
Compressor
Float Switch
Water Pump
Control Box
Drier
Fan Motor
Hot Gas Valve
Condenser
Water Supply Pipe
Spray Tubes
Transformer
(30V5V)
High Side
Access Valve
High Pressure
Switch
Strainer
Thermistor
Low Side
Access Valve
Evaporator
Inlet Water Valve
B. Construction
1. KM-320MAH-E (self-contained air-cooled)
Cord with
Fused Plug
(50V, 3A)

Cord with
Fused Plug
(50V, 3A)
Transformer
(30V5V)
2. KM-515MAH-E (self-contained air-cooled)
Control Switch
Expansion Valve
Compressor
Float Switch
Water Pump
Control Box
Drier
Fan Motor
Hot Gas Valve
Condenser
Water Supply Pipe
Spray Tubes
High Side
Access Valve
High Pressure
Switch
Strainer
Thermistor
Low Side
Access Valve
Liquid Line Valve
Evaporator
Inlet Water Valve
Bin Control Thermostat Bulb
(Thermostat Body is in Control Box)
3
Transformer
(30V5V)
3. KM-650MAH-E (self-contained air-cooled)
Control Switch
Expansion Valve
Compressor
Float Switch
Water Pump
Control Box
Drier
Fan Motor
Hot Gas Valve
Condenser
Water Supply Pipe
Spray Tubes
High Side
Access Valve
High Pressure
Switch
Strainer
Thermistor
Low Side
Access Valve
Evaporator
Inlet Water Valve
Cord with
Fused Plug
(50V, 3A)
Bin Control Thermostat Bulb
(Thermostat Body is in Control Box)
4
C. Sequence of Operation
The steps in the sequence are as outlined below. When power is supplied, the red
"POWER OK" LED on the control board comes on. A 5-second delay occurs at startup.
Note that the order of the LEDs from the outer edge of the control board is , 4, 3, .
1. One Minute Fill Cycle
LED 4 is on. WV opens and the ll period begins. After  minute, the control board
checks for a closed F/S. If F/S is closed, the harvest cycle begins. If not, WV will remain
energized through additional  minute cycles until water enters the sump and F/S closes.
This serves as a low water safety to protect PM.
2. Initial Harvest Cycle
LEDs , 4, and  are on. WV remains open, Comp and HGV energize. The control board
monitors the warming of the evaporator via the thermistor located on the suction line.
When the thermistor reaches 48°F (9°C), the control board reads a 3.9 kΩ signal from
the thermistor and turns harvest termination over to the adjustable harvest timer (S4 dip
switch  & ) which is factory set for normal conditions. The harvest timer has settings
of 60, 90, 0, and 80 seconds. For details, see "II.D.3.b) Harvest Timer (S4 dip switch
 & )." When the harvest timer completes its countdown, the harvest cycle is complete
and the freeze cycle starts. The minimum total time allowed by the control board for a
complete harvest cycle is  minutes. WV is energized during harvest for a maximum of
6 minutes or the length of harvest, whichever is shorter. At the end of harvest, the control
board checks the position of F/S and proceeds to the freeze cycle if it is closed or calls
for a -minute ll if it is open.
3. Freeze Cycle
LED  is on. Comp continues to run, PM and FMS energize, LLV opens, HGV and
WV close, and the freeze cycle starts. For the rst 5 minutes, the control board will not
accept a signal from F/S. This 5 minute minimum freeze acts as a short cycle protection.
At the end of 5 minutes, F/S assumes control. As ice builds on the evaporator the water
level in the sump lowers. The freeze continues until F/S opens and terminates ice
production.
4. Pump-Out Cycle
LEDs , 3, and  are on. Comp continues to run, HGV opens, LLV closes, and FMS
de-energizes. PM stops for 5 seconds and reverses, taking water from the bottom of
the sump and forcing pressure against the check valve seat allowing water to go through
the check valve and down the drain. At the same time, water ows through the small
tube to power ush F/S. When the pump-out timer (S4 dip switch 3 & 4) stops counting,
the pump out is complete. The st pump out occurs after the st freeze cycle. The pump-
out frequency control (S4 dip switch 5 & 6) determines the frequency of subsequent
pump outs. For details, see "II.D.3.d) Pump-Out Frequency Control (S4 dip switch 5 &
6)."
5
5. Normal Harvest Cycle
LEDs , 4, and  are on. Comp and HGV remain energized. PM stops and WV
energizes. The control board monitors the warming of the evaporator via the thermistor
located on the suction line. When the thermistor reaches 48°F (9°C), the control board
reads a 3.9 kΩ signal from the thermistor and turns harvest termination over to the
adjustable harvest timer (S4 dip switch  & ) on cycles with a pump-out and to the
pump-out timer's harvest timer on cycles with a pump out. For details, see "II.D.3.b)
Harvest Timer (S4 Dip Switch  & )" and "II.D.3.c) Pump-Out Timer." When the harvest
timer completes its countdown, the harvest cycle is complete and the freeze cycle starts.
The minimum total time allowed by the control board for a complete harvest cycle is
 minutes. WV is energized during harvest for a maximum of 6 minutes or the length
of harvest, whichever is shorter. At the end of harvest, the control board checks the
position of F/S and proceeds to the freeze cycle if it is closed or calls for a -minute ll if
it is open.
Legend: Comp–compressor; FMS–self-contained fan motor; F/S–oat switch;
HGV–hot gas valve; LLV–liquid line valve; PM–pump motor; WV–inlet water
valve
6
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 unit. When in the
"WASH" position, power is supplied to the pump motor. The cleaner and sanitizer ow over the outside of
the evaporator plate assembly.
Legend:
Comp-compressor
FMS-self-contained fan motor
F/S-oat switch
HGV-hot gas valve
LLV-liquid line valve
PM-pump motor
WV-inlet water valve
KM-320MAH-E, KM-515MAH-E, KM-650MAH-E Sequence Flow Chart and Component Operation
1. One Minute
Fill Cycle
2. Harvest Cycle 3. Freeze Cycle
4. Pump-Out
Cycle
WV energized
F/S open
F/S closed
WV continues (or
energized)
Comp energized
HGV energized
Thermistor temp
reaches 48°F (9°C)
(3.9 kΩ or less)
Harvest timer starts
F/S open
Comp continues
FMS energized
LLV energized
PM energized
HGV de-energized
WV de-energized
F/S closed
Freeze cycle
operation turned
over to F/S
PM de-energized for
5 sec., then energized
in reverse for 0/0 sec.
each , , 5, or 0 cycles.
Comp continues
HGV energized
WV energized (dependent
on pump-out timer setting)
FMS de-energized
LLV de-energized
F/S check
F/S check
• Maximum inlet water valve time: 6 minutes
• Maximum harvest time: 0 minutes
Thermistor in
control
 to 3 minute timer
in control
• Minimum freeze time: 5 minutes
• Maximum freeze time: freeze timer setting
5 minute timer
in control
F/S in
control
Initial startup always
begins here. There
is a 5 second delay
from power on.
If F/S is open, compressor stops and cycle returns to  minute ll
7
D. Control Board
• A Hoshizaki exclusive solid-state control board is employed in KM-30MAH-E,
KM-55MAH-E, and KM-650MAH-E Modular Crescent Cubers.
• All models are pretested and factory-adjusted.
CAUTION
. 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 unit before handling or replacing the control board.
3. Do not touch the electronic devices on the control board or the back of the
control board.
4. Do not change wiring and connections. Do not misconnect K3, K4, and K5,
because the same connector is used for the thermistor and oat switch. K4
is not connected.
5. Always replace the whole control board assembly if it goes bad.
6. Do not short out power supply to test for voltage.
8
Control Board
Part Number A40-0 (factory); 2A1410-02 (service)
Type HOS-00A (Control Products - 0 Pin)
Control Products "E" Control Board
1. Control Board Layout
"OUTPUT TEST" Switch
(used to test relays on board)
Connector K3
Harvest Control
(thermistor)
Connector K4
Open
(not connected)
Microprocessor
(board revision level
indicated by last
 digits on label)
Connector K5
Float Switch
Part Number
Connector K
Pins # through #0
#, 9 Magnetic Contactor
# Hot Gas Valve
#3 Liquid Line Valve
Self-Contained Fan Motor
#4 Pump Motor (icemaking)
#5 Pump Motor (pump out)
#6 Inlet Water Valve
#7, 0 Power Supply
#8 Open
Switch for "C" board
and "ALPINE" board
(service board only)
Set to "ALP" for units
covered in this manual.
"ALARM RESET" Switch
Backup Freeze
Timer LED
S4 Dip Switch
Backup Harvest
Timer LED
Alarm Buzzer
Power LED
(lights when
power is supplied
to the board)
Relay LEDs (4)
(indicate which
relays are energized
as listed below)
LED 
Hot Gas Valve (HGV)
Liquid Line Valve
(LLV) & Self-
Contained Fan Motor
(FMS) (LLV & FMS
off when LED on)
LED 3
Pump Motor (PM)
(on at pump out only)
LED 4
Inlet Water Valve (WV)
LED 
Compressor (Comp)
Control Transformer Connector
9
2. Features
a) Maximum Water Supply Period – 6 minutes
The inlet water valve will be open during harvest for 6 minutes or the length of harvest
whichever is shorter.
b) Harvest Backup Timer and Freeze Timer
The harvest backup timer shuts down the icemaker if, for two cycles in a row, the harvest
cycle takes more than 0 minutes to complete. The control board will signal this problem
using  beeps every 3 seconds.
The freeze timer shuts down the icemaker if, for two cycles in a row, the freeze
cycle takes longer than the time specied to complete. The control board will signal
this problem using 3 beeps every 3 seconds. The time is factory set using S4 dip
switch 9 & 0. For details, see "II.D.3.f) Freeze Timer (S4 dip switch 9 & 0)."
The "ALARM RESET" button on the control board must be pressed with power on to
reset either of these safeties.
c) High Temperature Safety
The temperature of the suction line in the refrigeration circuit is limited by the high
temperature safety. This protects the unit from excessively high temperatures. If the
evaporator temperature rises above 7 ± 7°F (53 ± 4°C), the control board reads a
.804 kΩ signal from the thermistor and operates the safety. This shuts down the circuit
and the icemaker automatically stops.
The control board will signal this problem using  beep every 3 seconds. The "ALARM
RESET" button on the control board must be pressed with power on to reset the safety.
d) Low Water Safety
The control board checks the position of the oat switch at the end of the initial  minute
water ll cycle and at the end of each harvest cycle.
If the oat switch is in the up position (electrical circuit closed), the control board
changes to the ice making cycle. If the oat switch is in the down position (electrical
circuit open), the control board changes to additional  minute water ll cycles until water
enters the sump and the oat switch closes. When the oat switch closes, the control
board changes to the ice making cycle. The unit will not start without adequate water in
the sump. This serves as a low water safety to protect the pump motor from mechanical
seal failure.
e) High Voltage and Low Voltage Cut-outs
The maximum and minimum allowable supply voltages of this icemaker are limited by
the high voltage and low voltage cut-outs.
If miswiring (especially on single phase 3 wire models) causes excessive voltage
(47Vac ±5% or more) on the control board, the high voltage cut-out shuts down the
circuit in 3 seconds and the icemaker automatically stops. The control board will signal
this problem using 7 beeps every 3 seconds.
The icemaker also automatically stops in cases of insufcient voltage (9Vac ±5% or
less). The control board will signal this problem using 6 beeps every 3 seconds.
When the proper supply voltage is resumed, the icemaker automatically starts running
again.
0
f) LED Lights and Audible Alarm Safeties
The red LED indicates proper control voltage and will remain on unless a control voltage
problem occurs. At startup, a 5 second delay occurs while the board conducts an
internal timer check. A beep occurs when the power is turned off.
The green LEDs  through 4 energize and sequence from initial startup as listed in the
table below. Note that the order of the LEDs from the outer edge of the board is , 4, 3,
. For more information, see "II.C. Sequence of Operation."
Sequence Step LED
Energized
Components
Time LEDs are On
Min. Max. Avg.
 Minute Fill Cycle
4 WV 60 seconds
Harvest Cycle , 4, and  WV, HGV,
Comp
 minutes 0 minutes 3 to 5 minutes
Freeze Cycle Comp, PM,
FMS, LLV
5 minutes freeze timer
setting
30 to 35 minutes
Pump-Out Cycle , 4*, 3, and
Comp, HGV,
PM, WV*
0 seconds 0 seconds *pump-out timer
setting
The built in safeties shut down the unit and have alarms as listed below.
No. of Beeps
(every 3 sec.)
Type of Alarm Notes
High Evaporator Temp.
(temperature > 7°F)
(53°C)
Check for harvest problem (stuck HGV or
relay), hot water entering unit, or shorted
thermistor.
Harvest Backup Timer
(harvest > 0 min. for two
cycles in a row)
Orange LED marked H TIMER lights up.
Check for open thermistor, HGV not opening,
TXV or LLV leaking by, low charge, or
inefcient Comp.
3 Freeze Timer
(freeze > specied setting
for two cycles in a row)
Timer is factory set using
S4 dip switch 9 & 0
Yellow LED marked F TIMER lights up. Check
for F/S stuck closed (up), WV leaking by, HGV
leaking by, PM not pumping, TXV not feeding
properly, LLV not opening, low charge, or
inefcient Comp.
To reset the above safeties, press the "ALARM RESET" button with the power supply on.
6 Low Voltage
(9Vac ±5% or less)
Red LED will turn off if voltage protection
operates.
The control voltage safeties automatically reset
when voltage is corrected.
7 High Voltage
(47Vac ±5% or more)
Legend: Comp–compressor; FMS–self-contained fan motor; F/S–oat switch;
HGV–hot gas valve; LLV–liquid line valve; PM–pump motor; TXV–thermostatic
expansion valve; WV–inlet water valve
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Hoshizaki American, Inc. KM-320MAH-E User manual

Category
Ice cube makers
Type
User manual
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