Hoshizaki American, Inc. KM-515MAH, KM-515MWH, KM-515MRH Service Manual

Hoshizaki America, Inc.

Hoshizaki

Modular Crescent Cuber

Models
KM-515MAH

“A Superior Degree

of Reliability”

www.hoshizaki.com

KM-515MWH
KM-515MRH

SERVICE MANUAL

™

Number: 73157
Issued: 2-1-2008

1

IMPORTANT

Only qualified 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 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, write, or send an e-mail message to the HOSHIZAKI Technical
Support Department for assistance.

HOSHIZAKI AMERICA, INC.
618 Highway 74 South
Peachtree City, GA 30269

Attn: HOSHIZAKI Technical Support Department

Phone: [phone] Technical Service
[phone]
Fax: [phone]
[phone]
E-mail: [e-mail]

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.

2

IMPORTANT

This manual should be read carefully before the icemaker is serviced or
maintenance operations are performed. Only qualified 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.

CONTENTS

I. Specifications ...................................................................................................................... 5

A. Icemaker ....................................................................................................................... 5

1. KM-515MAH (air-cooled) ......................................................................................... 5

2. KM-515MWH (water-cooled) ................................................................................... 6

3. KM-515MRH (remote air-cooled) ............................................................................ 7

B. Condenser Unit ............................................................................................................. 8

1. URC-5F ................................................................................................................... 8

II. General Information ......................................................................................................... 10

A. Construction ................................................................................................................ 10

1. KM-515MAH (air-cooled) ....................................................................................... 10

2. KM-515MWH (water-cooled) ................................................................................. 11

3. KM-515MRH (remote air-cooled) .......................................................................... 12

B. Sequence of Operation ............................................................................................... 13

1. One Minute Fill Cycle ............................................................................................ 13

2. Initial Harvest Cycle .............................................................................................. 13

3. Freeze Cycle ......................................................................................................... 13

4. Pump-Out Cycle ................................................................................................... 13

5. Normal Harvest Cycle .......................................................................................... 14

C. Control Board .............................................................................................................. 16

1. Control Board Layout ............................................................................................. 17

2. Features ................................................................................................................ 18

a) Maximum Water Supply Period – Six minutes .................................................... 18

b) Harvest Backup Timer and Freeze Timer ........................................................... 18

c) High Temperature Safety .................................................................................... 18

d) Low Water Safety ............................................................................................... 18

e) High Voltage and Low Voltage Cut-outs ............................................................. 18

f) LED Lights and Audible Alarm Safeties ............................................................... 19

3. Controls and Adjustments ..................................................................................... 20

a) Default S4 Dip Switch Settings ........................................................................... 20

b) Harvest Timer (S4 dip switch 1 & 2) ................................................................... 20

c) Pump-Out Timer (S4 dip switch 3 & 4) ............................................................... 21

d) Pump-Out Frequency Control (S4 dip switch 5 & 6) ........................................... 22

e) Factory Use (S4 Dip Switch 7 & 8) ..................................................................... 22

f) Freeze Timer (S4 dip switch 9 & 10).................................................................... 22

4. Control Board Check Procedure ............................................................................ 23

5. Control Board Replacement .................................................................................. 23

D. Harvest Control – Thermistor ...................................................................................... 24

E. Bin Control .................................................................................................................. 24

3

III. Technical Information ...................................................................................................... 25

A. Water Circuit and Refrigeration Circuit ........................................................................ 25

1. KM-515MAH (air-cooled) ....................................................................................... 25

2. KM-515MWH (water-cooled) ................................................................................. 26

3. KM-515MRH (remote air-cooled) .......................................................................... 27

B. Wiring Diagrams .......................................................................................................... 28

1. KM-515MAH (air-cooled) and KM-515MWH (water-cooled) ................................. 28

2. KM-515MRH (remote air-cooled) .......................................................................... 29

C. Performance Data ....................................................................................................... 30

1. KM-515MAH (air-cooled) ....................................................................................... 30

2. KM-515MWH (water-cooled) ................................................................................. 31

3. KM-515MRH (remote air-cooled) ..........................................................................

IV. Service Diagnosis ........................................................................................................... 33

A. 10-Minute KM Diagnostic Procedure .........................................................................

B. Diagnostic Charts ........................................................................................................ 35

1. No Ice Production .................................................................................................. 35

2. Evaporator is Frozen Up ........................................................................................ 38

3. Low Ice Production ................................................................................................ 40

4. Abnormal Ice ......................................................................................................... 40

5. Other ...................................................................................................................... 41

V. Removal and Replacement of Components .................................................................... 42

A. Service for Refrigerant Lines ...................................................................................... 42

1. Refrigerant Recovery ............................................................................................. 42

2. Brazing ..................................................................................................................

3. Evacuation and Recharge (R-404A) ...................................................................... 43

B. Removal and Replacement of Compressor ................................................................ 44

C. Removal and Replacement of Expansion Valve ......................................................... 45

D. Removal and Replacement of Hot Gas Valve or Line Valve ....................................... 46

E. Removal and Replacement of Evaporator .................................................................. 47

F. Removal and Replacement of Water Regulating Valve -Water-Cooled Model Only .... 47

G. Adjustment of Water Regulating Valve - Water-Cooled Model Only ........................... 48

H. Removal and Replacement of Headmaster (Condensing Pressure Regulator - C.P.R.)

- Remote Air-Cooled Model Only .............................................................................. 49

I. Removal and Replacement of Thermistor .................................................................... 50

J. Removal and Replacement of Fan Motor .................................................................... 51

K. Removal and Replacement of Inlet Water Valve ......................................................... 51

L. Removal and Replacement of Pump Motor ................................................................. 52

VI. Cleaning and Maintenance ............................................................................................ 53

A. Cleaning and Sanitizing Instructions ........................................................................... 53

1. Cleaning Procedure ...............................................................................................

2. Sanitizing Procedure - Following Cleaning Procedure .......................................... 55

B. Maintenance ................................................................................................................ 56

C. Preparing the Icemaker for Long Storage ................................................................... 56

32

33

42

54

4

I. Specifications

AC SUPPLY VOLTAGE 115/60/1
AMPERAGE 11.7 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY 20 A
MAXIMUM FUSE SIZE 20 A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *501 (227) 482 (218) 447 (203)
Reference without *marks 80 486 (221) 456 (207) 416 (189)

90 482 (218) *435 (197) 396 (180)

100 472 (214) 426 (193) 361 (164)
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.) 1090(6.0) 980(4.7)
WATER gal./24HR (gal./100 lbs.) 99(22.8) 188(37.6)
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 Permanent - 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 RST55C1E-CAA-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. 7.3 oz. (660g)
DESIGN PRESSURE High 467PSIG, Low 206PSIG
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 Dispenser or Ice Storage Bin
OPERATING CONDITIONS VOLTAGE RANGE 104 - 127 V

AMBIENT TEMP. 45 -100° F
WATER SUPPLY TEMP. 45 - 90° F

WATER SUPPLY PRESSURE 10 - 113 PSIG

A. Icemaker

1. KM-515MAH (air-cooled)

Note: We reserve the right to make changes in specifications and design without prior

notice.

5

2. KM-515MWH (water-cooled)

AC SUPPLY VOLTAGE 115/60/1
AMPERAGE 9.6 A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY 20 A
MAXIMUM FUSE SIZE 20 A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *500 (227) 493 (223) 465 (211)
Reference without *marks 80 494 (224) 483 (219) 445 (202)

90 493 (223) *475 (215) 441 (200)

100 481 (218) 467 (212) 409 (186)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 10.3 lbs. (4.7 kg) 480pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 950(4.8) 940(4.5)
WATER gal./24HR (gal./100 lbs.) 102(21.5) 163(32.5)
WATER COOLED CONDENSER 546(115) 352(70)

gal./24HR (gal./100 lbs.)
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 Permanent - Connection

- WATER SUPPLY Inlet 1/2" FPT Cond. Inlet 1/2" FPT

- DRAIN Outlet 3/4" FPT Cond. Outlet 3/8" 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 Pressure Regulator
BIN CONTROL SYSTEM Thermostat
COMPRESSOR Hermetic, Model RST55C1E-CAA-202
CONDENSER Water-cooled, Tube in tube type
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve
REFRIGERANT CHARGE R404A, 0 lb. 14.8 oz. (420g)
DESIGN PRESSURE High 427PSIG, Low 206PSIG
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 Dispenser or Ice Storage Bin
OPERATING CONDITIONS VOLTAGE RANGE 104 - 127 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 specifications and design without prior

notice.

6

3. KM-515MRH (remote air-cooled)

AC SUPPLY VOLTAGE 115/60/1
AMPERAGE 11.3A ( 5 Min. Freeze AT 104°F / WT 80°F)
MINIMUM CIRCUIT AMPACITY 20 A
MAXIMUM FUSE SIZE 20 A
APPROXIMATE ICE PRODUCTION Ambient WATER TEMP. (°F)
PER 24 HR. Temp.(°F) 50 70 90
lbs./day ( kg/day ) 70 *491 (223) 480 (218) 443 (201)
Reference without *marks 80 482 (219) 465 (211) 417 (189)

90 480 (218) *452 (205) 408 (185)

100 465 (211) 442 (200) 368 (167)
SHAPE OF ICE Crescent Cube
ICE PRODUCTION PER CYCLE 10.3 lbs. (4.7 kg) 480pcs.
APPROXIMATE STORAGE CAPACITY N/A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kWH/100 lbs.) 1090(5.8) 1000(4.9)
WATER gal./24HR (gal./100 lbs.) 94(20.8) 198(40.4)
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 Permanent - 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 RST55C1E-CAA-202
CONDENSER Air-Cooled Remote, Condenser Unit URC-5F
EVAPORATOR Vertical type, Stainless Steel and Copper
REFRIGERANT CONTROL Thermostatic Expansion Valve

Condensing Pressure Regulator on URC-5F

REFRIGERANT CHARGE R404A, 4 lbs. 4.8 oz. (1950g)

(Icemaker 2 lbs. 6.8 oz. Cond. Unit 1 lbs. 14 oz.)
DESIGN PRESSURE High 467PSIG, Low 206PSIG
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 Dispenser or Ice Storage Bin, Remote Condenser Unit
OPERATING CONDITIONS VOLTAGE RANGE 104 - 127 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 specifications and design without prior

notice.

7

B. Condenser Unit

1. URC-5F

24"

(610 mm)

23-1/32"

(585 mm)

Unit: inches (mm)

18-1/8"

(460 mm)

17-1/8"

(435 mm)

14-9/16"

(370 mm)

19-11/16"
(500 mm)

18-1/8"

(460 mm)

20-15/32"
(520 mm)

21-15/16"
(557 mm)

6/16" × 3/4" (10×20 mm)
4×2 (SLOTTED HOLES)

14-1/8"

(358 mm)

(380 mm)

14-15/16"

(398 mm)

15-11/16"

17-7/8"

(454 mm)

(380 mm)

14-15/16"

2-1/2"

(63 mm)

7/8" DIA. HOLE

(23 mm DIA.)

6-5/16"

(160 mm)

2-15/16"
(75 mm)

8

Specifications

SPECIFICATION NO. 06A022

ISSUED: 10/12/2006

ITEM: HOSHIZAKI REMOTE CONDENSER UNIT

MODEL URC-5F

BEGINNING SERIAL NO. ________________

ENDING SERIAL NO. ___________________

AC SUPPLY VOLTAGE 115/60/1 (Connection to Icemaker)

FAN MOTOR 115 V Total 1.3FLA 65W

EXTERIOR DIMENSIONS (WxDxH) 21-15/16" x 15-11/16" x 17-7/8" (557 x 398 x 454 mm)

DIMENSIONS INCLUDING LEGS (WxDxH) 24" x 18-1/8" x 32-13/16" (610 x 460 x 834 mm)

EXTERIOR FINISH Galvanized Steel

WEIGHT Net 61 lbs. ( 28 kg ) Shipping 68 lbs. ( 31 kg )

CONNECTIONS - ELECTRIC Permanent - Connection

- REFRIGERANT Discharge Line 1-1/16"-12 UNF Fitting (#10 AEROQUIP)

Liquid Line 5/8"-18 UNF Fitting (#6 AEROQUIP)

CONDENSER Air-cooled, Fin and tube type

FAN MOTOR PROTECTION Thermal Protection

REFRIGERANT CONTROL Condensing Pressure Regulator

REFRIGERANT CHARGE R-404A 1 lb. 14 oz. (850g)

DESIGN PRESSURE High 467 PSIG

OPERATING CONDITIONS VOLTAGE RANGE 104 ~ 127 V

AMBIENT TEMP. -20 ~ 122 °F

ACCESSORIES -SUPPLIED Leg 2 pcs

Hex. Head Bolt w/Washer 8 x 16 8 pcs

Hex. Nut 8 8 pcs

MODEL: URC-5F

Note: We reserve the right to make changes in specifications and design without prior

notice.

9

II. General Information

A. Construction

1. KM-515MAH (air-cooled)

Expansion Valve

Bin Control Thermostat

Control Switch

Compressor

Spray Tubes

Water Supply Pipe

Condenser

Hot Gas Valve

Fan Motor Condenser

Liquid Line Valve

Drier

Float Switch

Control Box

Water Pump

10

2. KM-515MWH (water-cooled)

Expansion Valve

Spray Tubes

Bin Control
Thermostat

Control Switch

Water Supply Pipe

Water Regulator

Hot Gas Valve

Compressor

Float Switch

Water Pump

Condenser

Liquid Line Valve

Drier

Control Box

11

3. KM-515MRH (remote air-cooled)

Expansion Valve

Water Supply Pipe

Spray Tubes

Bin Control
Thermostat

Control Switch

Compressor

Float Switch

Junction Box

Hot Gas Valve

Reciever Tank

Drier

Liquid Line Valve

Water Pump

Control Box

12

B. 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 board is 1, 4, 3, 2.

1. One Minute Fill Cycle

LED 4 is on. WV opens and the fill period begins. After 1 minute, the board checks for
a closed F/S. If F/S is closed, the harvest cycle begins. If not, WV will remain energized
through additional 1 minute cycles until water enters the sump and F/S closes. This
serves as a low water safety to protect the water pump.

2. Initial Harvest Cycle

LEDs 1, 4, and 2 are on. WV remains open, Comp, FMR, 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
which is factory set for normal conditions. The timer has settings of 60, 90, 120, and
180 seconds (S4 dip switch 1 & 2). For details, see "II.C.3.b) Harvest 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 2 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 1-minute
fill if it is open.

3. Freeze Cycle

LED 1 is on. Comp and FMR continue to run, PM and FMS energize, LLV opens, HGV
and WV close, and the freeze cycle starts. For the first 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 1, 3, and 2 are on. Comp and FMR continue to run, HGV opens, LLV closes, and
FMS de-energizes. PM stops for 2 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 flows through the
small tube to power flush the F/S. When the pump-out timer (S4 dip switch 3 & 4) stops
counting, the pump out is complete. The pump-out frequency control (S4 dip switch
5 & 6) is factory-adjusted to drain the water tank every cycle, and no adjustment should
be made.

13

5. Normal Harvest Cycle

LEDs 1, 4, and 2 are on. Comp, FMR, 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
pump-out timer's harvest timer which is factory set for normal conditions. For details,
see "II.C.3.c) Pump-Out Timer." When the pump-out timer's 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 2 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 1-minute fill if it is open.

Legend: Comp–compressor; FMR–remote fan motor; FMS–self-contained fan motor;
F/S–float switch; HGV–hot gas valve; LLV–liquid line valve; PM–pump motor;
WV–inlet water valve

14

Cycle

4. Pump-Out

F/S in

control

5 minute timer

in control

• Minimum freeze time: 5 minutes

• Maximum freeze time: freeze timer setting

Pump motor stops

for 2 sec. and then

reverses for 10/20 sec.

Freeze cycle

operation turned

over to F/S

F/S closed

Comp continues

FMR continues

HGV de-energized

F/S Check

each cycle.

WV de-energized

Comp continues

PM energized

FMR continues

HGV energized

FMS energized

F/S open

FMS de-energized

1 to 3 minute timer

in control

Thermistor temp

reaches 48°F (9°C)

2. Harvest Cycle 3. Freeze Cycle

Thermistor in

• Maximum harvest time: 20 minutes

Fill Cycle

control

F/S closed

Initial startup always

begins here

Comp energized

HGV energized

F/S Check

WV Energized

"E" board will have

5 second delay

• Maximum inlet water valve time: 6 minutes

1. One Minute

KM-515MAH, KM-515MWH, KM-515MRH Sequence Flow Chart and Component Operation

Cycle Steps

Harvest timer starts

(3.9 kΩ or less)

FMR energized

WV continues

F/S open

If F/S is open, compressor stops and cycle returns to 1 minute fill

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. With the cleaning valve closed, the cleaner and

sanitizer flow over the outside of the evaporator plate assembly. With the cleaning valve open, the cleaner

and sanitizer flow 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 unit will not re-start

Legend:

Comp-compressor

FMS-self-contained fan motor

F/S-float switch

HGV-hot gas valve

FMR-remote fan motor

PM-pump motor

when the control switch is placed in the "ICE" position.

WV-inlet water valve

15

C. Control Board

• A HOSHIZAKI exclusive solid-state control is employed in KM-515MAH, KM-515MWH,
and KM-515MRH Modular Crescent Cubers.

• All models are pretested and factory-adjusted.

CAUTION

1. Fragile, handle very carefully.

2. 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 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. Do not misconnect K3, K4, and K5,
because the same connector is used for the thermistor and float switch. K4 is
not connected.

5. Always replace the whole board assembly if it goes bad.

6. Do not short out power supply to test for voltage.

16

1. Control Board Layout

Control Products "E" Control Board

Alarm Reset Switch

Backup Freeze
Timer LED

Backup Harvest
Timer LED

Alarm Buzzer

S4 Dip Switch

Output Test Switch
(used to test relays on board)

Connector K3
Harvest Control
(thermistor)

Connector K4
Open
(not connected)

Power LED
(lights when
power is supplied
to the board)

Relay LEDs (4)
(indicate which
relays are energized
as listed below)

LED 2
Hot Gas Valve (HGV)
Self-Contained Fan
Motor (FMS) (FMS
off when LED on)

LED 3
Pump Motor (PM)
(on at pump out only)

LED 4
Water Valve (WV)

LED 1
Compressor (Comp)
Remote Fan Motor
(FMR)

Transformer
Connector

Microprocessor
(board revision level
indicated by last 2
digits on label)

Connector K5
Float Switch

Part Number

Connector K1

Pins #1 through #10
#1, 9 Magnetic Contactor
#2 Hot Gas Valve
#3 Line Valve
Self-Contained Fan Motor (FMS)
#4 Pump Motor (icemaking)
#5 Pump Motor (drain)
#6 Water Valve
#7, 10 Power (line, bin control)
#8 Open

Switch for "C" board
and "ALPINE" board
(service boards only)

Control Board

Part Number 2A1410-01 (factory); 2A1410-02 (service)

Type HOS-001A (Control Products - 10 Pin)

17

2. Features

a) Maximum Water Supply Period – Six minutes

The inlet water valve will be open during harvest for six 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 20 minutes to complete. The control board will signal this problem
using 2 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 specified 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 &

10.
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 127 ± 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 1 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 float switch at the end of the initial one
minute water fill cycle and at the end of each harvest cycle.
If the float switch is in the up position (electrical circuit closed), the control board
changes to the ice making cycle. If the float switch is in the down position (electrical
circuit open), the control board changes to additional one minute water fill cycles until
water enters the sump and the float switch closes. When the float 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.
For water-cooled model, if the water is shut off, the unit is protected by the high pressure
switch.

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
(147Vac ±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 insufficient voltage (92Vac ±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.

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