Hoshizaki KMD-410MAH, KMD-410MWH User Manual

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i

CONTENTS

PAGE

I. SPECIFICATIONS---------------------------------------------------------------------------------------

1

1. SPECIFICATIONS-----------------------------------------------------------------------------------

1

[a] KMD-410MAH (air-cooled) ---------------------------------------------------------------------

1

[b] KMD-410MWH (water-cooled) ----------------------------------------------------------------

2

II. GENERAL INFORMATION---------------------------------------------------------------------------

3

1. CONSTRUCTION------------------------------------------------------------------------------------

3

[a] KMD-410MAH -------------------------------------------------------------------------------------

3

[b] KMD-410MWH ------------------------------------------------------------------------------------

4

2. SEQUENCE OF OPERATION--------------------------------------------------------------------

5

[a] ONE MINUTE FILL CYCLE --------------------------------------------------------------------

5

[b] INITIAL HARVEST CYCLE---------------------------------------------------------------------

5

[c] FREEZE CYCLE ----------------------------------------------------------------------------------

5

[d] DRAIN CYCLE ------------------------------------------------------------------------------------

5

[e] NORMAL HARVEST CYCLE------------------------------------------------------------------

6

3. CONTROL BOARD ----------------------------------------------------------------------------------

8

[a] CONTROL BOARD LAYOUT------------------------------------------------------------------

9

[b] FEATURES ---------------------------------------------------------------------------------------

10

[c] CONTROLS AND ADJUSTMENTS ---------------------------------------------------------

12

[d] CONTROL BOARD CHECK PROCEDURE ----------------------------------------------

17

[e] CONTROL BOARD REPLACEMENT ------------------------------------------------------

17

4. HARVEST CONTROL – THERMISTOR -------------------------------------------------------

18

5. FLOAT SWITCH--------------------------------------------------------------------------------------

19

[a] EXPLANATION OF OPERATION -----------------------------------------------------------

19

[b] CLEANING ----------------------------------------------------------------------------------------

19

[c] FLOAT SWITCH CHECK PROCEDURE --------------------------------------------------

19

6. BIN CONTROL ---------------------------------------------------------------------------------------

20

[a] EXPLANATION OF OPERATION -----------------------------------------------------------

20

[b] BIN CONTROL CHECK PROCEDURE ----------------------------------------------------

20

7. SWITCHES --------------------------------------------------------------------------------------------

21

[a] CONTROL SWITCH ----------------------------------------------------------------------------

21

[b] SERVICE SWITCH------------------------------------------------------------------------------

21

III. TECHNICAL INFORMATION ----------------------------------------------------------------------

22

1. WATER CIRCUIT AND REFRIGERANT CIRCUIT ------------------------------------------

22

2. WIRING DIAGRAM ----------------------------------------------------------------------------------

23

3. TIMING CHART---------------------------------------------------------------------------------------

24

4. PERFORMANCE DATA ----------------------------------------------------------------------------

25

[a] KMD-410MAH ------------------------------------------------------------------------------------

25

[b] KMD-410MWH -----------------------------------------------------------------------------------

26

IV. SERVICE DIAGNOSIS ------------------------------------------------------------------------------

27

ii

 

1. 10-MINUTE DIAGNOSTIC PROCEDURE -----------------------------------------------------

27

2. DIAGNOSTIC CHARTS-----------------------------------------------------------------------------

29

[a] NO ICE PRODUCTION ------------------------------------------------------------------------

29

[b] EVAPORATOR IS FROZEN UP-------------------------------------------------------------

32

[c] LOW ICE PRODUCTION ----------------------------------------------------------------------

33

[d] ABNORMAL ICE---------------------------------------------------------------------------------

33

[e] OTHER ---------------------------------------------------------------------------------------------

34

V. REMOVAL AND REPLACEMENT-----------------------------------------------------------------

35

1. SERVICE FOR REFRIGERANT LINES --------------------------------------------------------

35

[a] SERVICE INFORMATION---------------------------------------------------------------------

35

[b] REFRIGERANT RECOVERY-----------------------------------------------------------------

36

[c] EVACUATION AND RECHARGE------------------------------------------------------------

36

2. BRAZING -----------------------------------------------------------------------------------------------

37

3. COMPRESSOR---------------------------------------------------------------------------------------

37

4. DRIER ---------------------------------------------------------------------------------------------------

38

5. HOT GAS VALVE ------------------------------------------------------------------------------------

39

6. EXPANSION VALVE --------------------------------------------------------------------------------

40

7. EVAPORATOR----------------------------------------------------------------------------------------

41

8. WATER REGULATING VALVE – WATER-COOLED MODEL ONLY-------------------

42

9. ADJUSTMENT OF WATER REGULATING VALVE – WATER-COOLED

 

MODEL ONLY -----------------------------------------------------------------------------------------

43

10. FAN MOTOR ------------------------------------------------------------------------------------------

43

11. PUMP MOTOR----------------------------------------------------------------------------------------

44

12. WATER VALVE---------------------------------------------------------------------------------------

45

13. DRAIN VALVE, CLEANING VALVE -------------------------------------------------------------

45

14. WATER TANK-----------------------------------------------------------------------------------------

46

15. FLOAT SWITCH--------------------------------------------------------------------------------------

47

16. BIN CONTROL SWITCH ---------------------------------------------------------------------------

48

17. THERMISTOR ----------------------------------------------------------------------------------------

49

18. CONTROL BOX --------------------------------------------------------------------------------------

50

[a] CONTROL & SERVICE SWITCH------------------------------------------------------------

52

[b] FUSE------------------------------------------------------------------------------------------------

52

[c] FUSE HOLDER-----------------------------------------------------------------------------------

52

[d] CONTROL BOARD------------------------------------------------------------------------------

52

[e] MAGNETIC CONTACTOR --------------------------------------------------------------------

52

[f] CONTROL BOARD TRANSFORMER-------------------------------------------------------

52

[g] STARTER------------------------------------------------------------------------------------------

53

[h] RUN CAPACITOR -------------------------------------------------------------------------------

53

[i] START CAPACITOR-----------------------------------------------------------------------------

53

[j] CAPACITOR FOR PUMP MOTOR-----------------------------------------------------------

53

19. SPRAY TUBE, WATER SUPPLY TUBE, SPRAY GUIDE ---------------------------------

53

VI. CLEANING AND MAINTENANCE INSTRUCTIONS ----------------------------------------

55

1. CLEANING ---------------------------------------------------------------------------------------------

55

[a] CLEANING PROCEDURE---------------------------------------------------------------------

55

[b] SANITIZING PROCEDURE -------------------------------------------------------------------

58

2. MAINTENANCE --------------------------------------------------------------------------------------

58

[a] STAINLESS STEEL EXTERIOR -------------------------------------------------------------

59

[b] STORAGE BIN AND SCOOP-----------------------------------------------------------------

59

[c] AIR FILTER (AIR-COOLED MODEL ONLY) ----------------------------------------------

59

[d] CONDENSER (AIR-COOLED MODEL ONLY) -------------------------------------------

59

3. PREPARING THE ICEMAKER FOR LONG STORAGE------------------------------------

59

iii

 

I. SPECIFICATIONS 1. SPECIFICATIONS

[a] KMD-410MAH (air-cooled)

AC SUPPLY VOLTAGE

115/60/1

 

 

 

 

AMPERAGE

 

8.0 A (5 Min. Freeze AT 104°F / WT 80°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

*415 (188)

 

388 (176)

354 (160)

Reference without *marks

80

395 (179)

 

353 (160)

320 (145)

 

 

90

388 (176)

 

*324 (147)

289 (131)

 

 

100

382 (173)

 

316 (143)

257 (117)

SHAPE OF ICE

 

Crescent Cube

 

 

 

 

ICE PRODUCTION PER CYCLE

8.5 lbs. (3.9 kg) 416 pcs.

 

 

APPROXIMATE STORAGE CAPACITY

N/A

 

 

 

 

ELECTRIC & WATER CONSUMPTION

90/70°F

 

 

70/50°F

 

ELECTRIC

W (kWH/100 lbs.)

780(5.8)

 

 

710(4.1)

 

WATER

gal./24HR (gal./100 lbs.)

73(22.6)

 

 

148(35.7)

 

EXTERIOR DIMENSIONS (WxDxH)

22-1/4" x 24-1/8" x 24" (565 x 613 x 610 mm)

 

EXTERIOR FINISH

Stainless Steel, Galvanized Steel (Rear)

 

WEIGHT

 

Net 126 lbs. (57 kg), Shipping 161 lbs. (73 kg)

 

CONNECTIONS - ELECTRIC

Permanent - Connection

 

 

 

- WATER SUPPLY

Inlet

1/2" FPT

 

 

 

- DRAIN

Outlet

3/4" FPT

 

 

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

Mechanical Level Switch with Delay

 

COMPRESSOR

Hermetic, Model NT6217GKV

 

 

CONDENSER

 

Air-Cooled, Fin and tube type

 

 

EVAPORATOR

 

Vertical type, Stainless Steel and Copper

 

REFRIGERANT CONTROL

Thermostatic Expansion Valve

 

 

REFRIGERANT CHARGE

R-404A, 1 lb. 2.3 oz. (520g)

 

 

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 - 113PSIG

We reserve the right to make changes in specifications and design without prior notice.

1

[b] KMD-410MWH (water-cooled)

AC SUPPLY VOLTAGE

115/60/1

 

 

 

 

 

AMPERAGE

 

6.5 A (5 Min. Freeze AT 104°F / WT 80°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

 

*440 (200)

 

423 (192)

 

392 (178)

Reference without *marks

80

 

427 (194)

 

401 (182)

 

364 (165)

 

 

90

 

423 (192)

 

*382 (173)

 

347 (157)

 

 

100

 

414 (188)

 

373 (169)

 

315 (143)

SHAPE OF ICE

 

Crescent Cube

 

 

 

 

 

ICE PRODUCTION PER CYCLE

8.2 lbs. (3.7 kg) 416 pcs.

 

 

 

APPROXIMATE STORAGE CAPACITY

N/A

 

 

 

 

 

ELECTRIC & WATER CONSUMPTION

90/70°F

 

 

70/50°F

 

ELECTRIC

W (kWH/100 lbs.)

680(4.3)

 

 

 

670(3.7)

 

 

WATER

gal./24HR (gal./100 lbs.)

89(23.2)

 

 

 

120(27.2)

 

 

WATER COOLED CONDENSER

552(145)

 

 

 

267(61)

 

 

gal./24HR (gal./100 lbs.)

 

 

 

 

 

EXTERIOR DIMENSIONS (WxDxH)

22-1/4" x 24-1/8" x 24" (565 x 613 x 610 mm)

 

EXTERIOR FINISH

Stainless Steel, Galvanized Steel (Rear)

 

WEIGHT

 

Net 128 lbs. (58 kg), Shipping 163 lbs. (74 kg)

 

CONNECTIONS - ELECTRIC

Permanent - Connection

 

 

 

 

- WATER SUPPLY

Inlet

1/2" FPT

Cond. Inlet

1/2" FPT

 

- DRAIN

Outlet

3/4" FPT

Cond. Outlet

1/2" FPT

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

Mechanical Level Switch with Delay

 

COMPRESSOR

Hermetic, Model NT6217GKV

 

 

 

CONDENSER

 

Water-Cooled, Tube in tube type

 

EVAPORATOR

 

Vertical type, Stainless Steel and Copper

 

REFRIGERANT CONTROL

Thermostatic Expansion Valve

 

 

 

REFRIGERANT CHARGE

R-404A, 14.1 oz. (400g)

 

 

 

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

We reserve the right to make changes in specifications and design without prior notice.

2

II. GENERAL INFORMATION

1. CONSTRUCTION

[a] KMD-410MAH

Water Supply Tube

 

Spray Guide

Cleaning Valve

Spray Tube

 

Access Valve

(High Side)

Thermistor

Access Valve

(Low Side)

Cube Guide

Water Tank

Pump Motor

Float Switch

Bin Control Switch

Drain Valve

Water Supply Inlet

Hot Gas Valve

Condenser

Expansion Valve

Fan Motor

Compressor

Control Box

Harvest Water Valve

Fill Water Valve

Control Switch

Service Switch

Fuse Holder (Fuse)

Drier

3

[b] KMD-410MWH

Water Supply Tube

Spray Guide

Spray Tube

Cleaning Valve

Access Valve

(High Side)

Thermistor

Access Valve

(Low Side)

Cube Guide

Water Tank

Pump Motor

Float Switch

Bin Control Switch

Drain Valve

Water Supply Inlet

Hot Gas Valve

Water Regulator

Expansion Valve

Condenser

Compressor

Drier

Control Box

Harvest Water Valve

Fill Water Valve

Control Switch

Service Switch

Fuse Holder (Fuse)

4

2. SEQUENCE OF OPERATION

The steps in the sequence are as outlined below. When power is supplied, a 5 second delay occurs at startup. Note that the order of the LEDs from the outer edge of the board is 5, 6, 8, 9, 4, 7.

[a] ONE MINUTE FILL CYCLE

LED 8 is on. HWV opens and the fill period begins. After 1 minute, the board checks for a closed LF/S. If LF/S is closed, the harvest cycle begins. If not, HWV will remain energized through additional 1 minute cycles until water enters the sump and LF/S closes. This serves as a low water safety to protect the water pump.

[b] INITIAL HARVEST CYCLE

LEDs 5, 6, and 8 are on. HWV remains open, Comp energizes, HGV opens, and harvest begins. As the evaporator warms, the thermistor located on the suction line checks for a 9°C temperature. When 9°C is reached, a 3.9 k signal turns the harvest over to the adjustable harvest timer which is factory set for normal conditions. The timer has settings of 60, 90, 120, and 180 seconds (S1 dip switch 1 & 2). When the harvest timer completes its count down, the harvest cycle is complete and the freeze cycle starts.

The minimum total time allowed by the board for a complete harvest cycle is 2 minutes. HWV is open during harvest for a maximum of 6 minutes or the length of harvest minus 0, 10, 30, or 50 seconds (adjustable by S1 dip switch 7 & 8), whichever is shorter. LED 8 goes off when HWV closes. PM energizes and runs for the last 0, 10, 30, or 50 seconds of harvest depending on S1 dip switch 7 & 8 setting. LED 7 comes on when PM energizes. At the end of harvest, the control board checks the position of LF/S and proceeds to the freeze cycle if it is closed or calls for a 1-minute fill if it is open.

[c] FREEZE CYCLE

LEDs 5 & 7 are on. Comp continues to run, PM and FMS energize, HGV closes and the freeze cycle starts. For the first 5 minutes after the thermistor temperature reaches 2°C, the control board will not accept a signal from LF/S and UF/S. This minimum freeze period acts as a short cycle protection. At the end of this period, LF/S and UF/S assumes control. As ice builds on the evaporator the water level in the sump lowers and LF/S opens, FWV opens (LED 9 is on when FWV is open). The refill will last until UF/S closes or for 60 seconds, whichever is shorter. After UF/S closes, FWV closes 3 seconds later. KMD-410 refills 1 time. After the refill, the freeze continues until LF/S opens again and terminates ice production.

[d] DRAIN CYCLE

LEDs 4, 5, 6, and 7 are on. Comp continues to run, HGV opens, FMS de-energizes. PM stops for 2 seconds, DV energizes, then restarts to take water from the sump and force it through DV and down the drain. When the drain timer stops counting, the drain is complete. The drain timer is 10 or 20 seconds (S1 dip switch 3 & 4). Drain cycle always occurs on the 2nd harvest after startup. Then, depending on the control board setting, drain cycle occurs every cycle, or every 2nd, 5th, or 10th cycles (S1 dip switch 5 & 6).

5

[e] NORMAL HARVEST CYCLE

LEDs 5, 6, and 8 are on. Comp continues to run, HGV remains open and HWV opens. As the evaporator warms, the thermistor reaches 9ºC. The control board then receives the thermistor’s 3.9k signal and starts the harvest timer. HWV is open during harvest for a maximum of 6 minutes or the length harvest minus 0, 10, 30, or 50 seconds (adjustable by S1 dip switch 7 & 8), whichever is shorter. LED 8 goes off when HWV closes. PM energizes and runs for the last 0, 10, 30, or 50 seconds of harvest depending on S1 dip switch 7 & 8 setting. LED 7 comes on when PM energizes. At the end of harvest, the control board checks for the position of LF/S and proceeds to the freeze cycle if it is closed or calls for a 1-minute fill if it is open.

The unit continues to cycle through [c], [d], and [e] sequence until the bin control is activated and shuts the unit down. When the bin control is activated, the “POWER OK” LED flashes.

Note: To prevent incomplete batches of ice from foaming on the evaporator, the control board will only shut down the machine within the first 5 minutes of the freeze cycle after the thermistor temperature reaches 2°C. If ice pushes the bin control actuator in (open) after this minimum freeze period, the control board will allow the machine to complete the freeze cycle and the following harvest cycle before shutting down the machine.

Legend: Comp–compressor; DV–drain valve; FMS–self-contained fan motor; FWV–fill water valve; HGV–hot gas valve; HWV–harvest water valve; LF/S–lower float switch contacts; UF/S–upper float switch contacts; PM–pump motor

6

7

KMD-410MAH, 410MWH

xMaximum harvest water valve time: 6 minutes (HWV time is 6 minutes of the length of harvest minus 0, 10, 30, or 50 sec. (S1 dip switch

7 & 8), whichever is shorter. PM energizes and runs for the last 0, 10, 30, or 50 sec. of harvest.)

xMaximum harvest time: 20 minutes

0, 0,30, or 50 sec

“H” board will have

5 second delay

HWV energized COMP energized HGV energized HWV continues FWV de-energized DV de-energized

xMinimum freeze time: 5 minutes xMaximum freeze time: freeze time setting xLower float switch used to initiate water Tank refill (1 refill for KMD-410)

xUpper float switch used to terminate water tank refill (1 minute maximum fill time)

COMP continues PM continues FWV energized/

de-energized for refill only

FMS energized HGV de-energized

4. Drain Cycle

Factory set for every 10th cycle (S1 dip Switch 5 & 6)

Pump motor stops for 2 sec. and then runs for 10/20 sec.

(S1 dip switch 3 & 4)

PM de-energizes 0/2 sec., energizes for 10/20 sec.

COMP continues DV energized/ HGV energized FMS de-energized

Legend:

COMP - compressor DV – drain valve

FMS – self-contained fan motor FWV – fill water valve

HGV – hot gas valve HWV – harvest water valve

LF/S – lower float switch contacts PM – pump motor

UF/S – upper float switch contacts

3. CONTROL BOARD

*A HOSHIZAKI exclusive solid-state control is employed in KMD-410MAH and KMD-410MWH Crescent Cubers.

*All models are pretested and factory-adjusted.

1.Fragile, handle very carefully.

2.A 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 when handling or replacing the board.

3.Do not touch the electronic devices on the board or the back of the board to prevent damage to the board.

4.Do not change wiring and connections.

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

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

8

[a] CONTROL BOARD LAYOUT

#4 Harvest Water Valve

#5 Freeze Water Valve

#1, 2, 3 Float Switch

Control Board

Auxiliary Code

V1 or Earlier

V2 or Later

Part Number

P00013-02

P01771-02

Type

HKM2006V003

9

[b] FEATURES

a) Maximum Water Supply Period - 6 minutes

The harvest water valve will be open during harvest for 6 minutes or the length of harvest minus 0, 10, 30, or 50 seconds (adjustable by S dip switch 7 & 8), 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 S1 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 53°C ± 4°C, the thermistor 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 lower float switch at the end of the initial one minute water fill cycle and at the end of each harvest cycle.

If the lower float switch is in the up position (electrical circuit closed), the control board changes to the next cycle. If the lower 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 next cycle. The unit will not start without adequate water in the sump. This serves as a low water safety to protect the water pump.

For water-cooled model, if the condenser water supply 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 3 phase wire models) causes excessive voltage (147 Vac ± 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.

10

Hoshizaki KMD-410MAH, KMD-410MWH User Manual

f) LED Lights and Audible Alarm Safeties

The control board includes LED indicator lights, audible alarm safeties, and an output test feature. The "POWER OK" LED indicates control voltage and will remain on unless a control voltage problem occurs. The “POWER OK” LED flashes continuously when the bin is full and DV energizes for a maximum of 5 minutes to drain the water tank.

At startup, a 5 second delay occurs to stabilize the circuit. LEDs 4 through 8 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 5, 6, 8, 9, 4, 7. For more information, see "2. SEQUENCE OF OPERATION".

HWV

HWV, HGV,

Comp

5, 7

(and

 

Comp, PM, FMS

9 at

refill)

 

(FWV at refill)

(92Vac ± 5% or less)

(147Vac ± 5% or less)

DV- drain valve; FMS-self-contained fan motor;

WRV-water regulating valve;

11

[c] CONTROLS AND ADJUSTMENTS

a) Default Dip Switch Settings

The dip switch is factory-adjusted to the following positions:

S1 Dip Switch No.

1

2

3

4

5

6

7

8

9

10

KMD-410MAH

OFF

OFF

OFF

OFF

ON

ON

ON

ON

OFF

OFF

KMD-410MWH

OFF

OFF

OFF

OFF

ON

ON

ON

ON

ON

OFF

S2 Dip Switch

* Functions of S2 dip switch nos. 2 through 6 depend on program version.

Control Board

Program Ver.

S2 Dip Switch No.

1

2

3

4

5

6

P00013-02

2.5 or earlier

KMD-410MAH

ON

OFF

ON

OFF

OFF

ON

KMD-410MWH

ON

OFF

ON

OFF

OFF

ON

 

 

 

3.1

KMD-410MAH

ON

ON

ON

OFF

OFF

ON

P01771-02

KMD-410MWH

ON

ON

ON

OFF

OFF

ON

 

3.2

KMD-410MAH

ON

ON

ON

OFF

OFF

OFF

 

 

KMD-410MWH

ON

ON

ON

OFF

OFF

OFF

 

 

Do not adjust the S2 dip switch. These must be left in the factory default position, or the unit will not operate properly.

b) Harvest Timer (S1 dip switch 1 & 2)

Used for adjustment of the harvest timer. The harvest timer starts counting when the thermistor reads a certain temperature at the evaporator outlet.

12

c) Drain Timer (S1 dip switch 3 & 4)

Once every ten freeze cycles, the drain valve opens to drain the water tank for the time determined by the drain timer. These switches also determine the time to delay completion of a defrost cycle, i.e. the minimum defrost time.

Do not change this setting, or the unit will not operate properly or produce high quality ice.

T1: Time to drain the water tank

T2: Harvest timer at drain

Drain cycle always occurs on the 2nd harvest after startup. Then, depending on the drain frequency control setting (dip switch 5 & 6), drain cycle occurs every cycle, or every 2nd, 5th, or 10th cycle.

d) Drain Frequency Control (S1 dip switch 5 & 6)

The water tank drains at the frequency set by the drain frequency control.

The drain frequency control is factory-adjusted to drain the water tank every 10 cycles, and no adjustment is required. However, where water quality is bad and the icemaker needs a drain more often, the drain frequency can be adjusted as shown in the table below.

e) Water Saver Timer (S1 dip switch 7 & 8)

The water saver timer allows the water valve to close and the pump motor to circulate water in the tank during the final part of harvest. The water valve is open during harvest for a maximum of 6 minutes or the length of harvest minus 0, 10, 30, or 50 seconds (determined by the water saver timer setting), whichever is shorter. When the water valve closes, the pump motor energizes and runs for the time determined by the water saver timer setting.

The water saver timer is factory-adjusted, and no adjustment is required.

13

f) Freeze Timer (S1 dip switch 9 & 10)

The freeze timer setting determines the maximum allowed freeze time to prevent possible freeze-up issues. Upon termination of freeze timer, machine initiates the harvest cycle. After 2 consecutive timer terminations, machine will shut down, possibly indicating a problem.

The freeze timer is factory adjusted, and no adjustment is required.

Time(50/60Hz)

(minutes)

60/60

80/50

100/70

120/100

g) Pump-Out Pump Motor Delay (S2 dip switch 1)

The pump-out pump motor delay determines whether or not the pump motor de-energizes for 2 seconds before restarting at the beginning of a drain cycle.

The pump-out pump motor delay is factory adjusted and no adjustment is required.

S2 Dip Switch Setting

Delay

No. 1

(seconds)

OFF

0

ON

2

Control Board P00013-02

h) Refill Counter (S2 dip switch 2, 3, & 4) [Program Ver. 2.5 or earlier]

Do not adjust. These must be left in the factory default position or the unit will not operate properly. The KMD-410MAH and KMD-410MWH refill 1 time.

i) Factory Use (S2 dip switch 5) [Program Ver. 2.5 or earlier]

Must remain off.

j) Anti-Slush Control (S2 dip switch 6) [Program Ver. 2.5 or earlier]

The anti-slush control (Ver. 1.0) helps prevent slushing during the freeze cycle on small icemakers.

It is deactivated on the KMD-410 series.

When activated, the thermistor located on the suction line checks for a 34°F (1°C) temperature as the evaporator cools. When 34°F (1°C) is reached, a 5.9 k signal causes the control board to de-energize the pump motor for 10 seconds.

Do not adjust. This must be left in the factory default position or the unit will not operate properly.

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S2 Dip Switch Setting

Anti-Slush Control

No. 6

 

OFF

Activated (Ver. 1.0)

ON

Deactivated

Control Board P01771-02

k) Harvest Promotion Control (S2 dip switch 2) [Program Ver. 3.1, Ver. 3.2]

Do not adjust. This must be left in the factory default position or the unit will not operate properly.

It is deactivated on the KMD-410 series.

When activated, this control promotes harvest of ice on the evaporator that is hard to remove. If the harvest cycle exceeds 6 minutes, the pump motor starts to operate for a maximum of 3 minutes.

S2 Dip Switch Setting

Harvest Promotion

No. 2

Control

OFF

Activated

ON

Deactivated

l) Refill Counter (S2 dip switch 3) [Program Ver. 3.1, Ver. 3.2]

Do not adjust. This must be left in the factory default position or the unit will not operate properly. The KMD-410MAH and KMD-410MWH refill 1 time.

m) Harvest Completion Detection Control (S2 dip switch 4) [Program Ver. 3.1, Ver. 3.2]

Do not adjust. This must be left in the factory default position or the unit will not operate properly.

It is deactivated on the KMD-410 series.

When activated, this control determines whether ice remains on the evaporator at the end of a harvest cycle and at the beginning of a freeze cycle. If ice drops and activates the bin control switch in the last 10 seconds of a harvest cycle, the control determines that ice still remains on the evaporator and extends the harvest cycle for 30 seconds. If the bin control switch is activated at the beginning of a freeze cycle, the control determines that ice still remains on the evaporator and starts a harvest cycle after the minimum freeze cycle time has passed.

S2 Dip Switch Setting

Harvest Completion

No. 4

Detection Control

OFF

Deactivated

ON

Activated

n) Overfreeze Detection Control (S2 dip switch 5) [Program Ver. 3.1, Ver. 3.2]

Do not adjust. This must be left in the factory default position or the unit will not operate properly.

It is deactivated on the KMD-410 series.

When activated, the thermistor detects the temperature of the evaporator outlet to find overfreeze in a harvest cycle and at the beginning of a freeze cycle. If the difference between the maximum temperature after the water saver timer starts counting and the

15

temperature at the end of a harvest cycle is 4K or more and if the temperature at the end of a harvest cycle is 48°F (9°C) or less, the harvest cycle is extended for 30 seconds. If the difference between the temperature at the beginning of a freeze cycle and the minimum temperature after 30 seconds in the freeze cycle is 2.5K or more and less than 3.5K, the next harvest cycle is extended for 30 seconds. If the above conditions occur in succession, the number of occurrence times 30 seconds will be added to the harvest cycle time. If the above temperature difference is 3.5K or more, the freeze cycle ends after the minimum freeze cycle time and a harvest cycle starts.

S2 Dip Switch Setting

Overfreeze Detection

No. 5

Control

OFF

Deactivated

ON

Activated

o) Anti-Slush Control (S2 dip switch 6) [Program Ver. 3.1]

Do not adjust. This must be left in the factory default position or the unit will not operate properly.

It is deactivated on the KMD-410 series.

When activated (Ver. 2.0), the thermistor located on the suction line checks for a 50°F (10°C) temperature as the evaporator cools. When 50°F (10°C) is reached, a 3.9 k signal causes the control board to de-energize the pump motor for 10 seconds and energize it for 50 seconds repeatedly. When 34°F (1°C) is reached, a 5.9 k signal causes the control board to de-energize the pump motor for 10 seconds, energize it for 50 seconds, de-energize it again for 10 seconds, then energize it continuously.

S2 Dip Switch Setting

Anti-Slush Control

No. 6

 

OFF

Activated (Ver. 2.0)

ON

Deactivated

p) Anti-Slush Control (S2 dip switch 6) [Program Ver. 3.2]

Do not adjust. This must be left in the factory default position or the unit will not operate properly.

When activated (Ver. 1.1), the thermistor located on the suction line checks for a 41°F (5°C) temperature as the evaporator cools. When 41°F (5°C) is reached, a 4.8 k signal causes the control board to de-energize the pump motor for 10 seconds.

When activated (Ver. 2.0), the thermistor located on the suction line checks for a 50°F (10°C) temperature as the evaporator cools. When 50°F (10°C) is reached, a 3.9 k signal causes the control board to de-energize the pump motor for 10 seconds and energize it for 50 seconds repeatedly. When 34°F (1°C) is reached, a 5.9 k signal causes the control board to de-energize the pump motor for 10 seconds, energize it for 50 seconds, de-energize it again for 10 seconds, then energize it continuously.

S2 Dip Switch Setting

Anti-Slush Control

No. 6

 

OFF

Activated (Ver. 1.1)

ON

Activated (Ver. 2.0)

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