Hoshizaki KM-40B User manual

KM-40B
KM-55B
KM-80B
SELF-CONTAINED CRESCENT CUBER
SERVICE MANUAL
F120-1011 (073117)

i
CONTENTS PAGE
I. SPECIFICATIONS -------------------------------------------------------------------------------------1
1. DIMENSIONS/SPECIFICATIONS--------------------------------------------------------------1
[a] KM-40B (Europe)-------------------------------------------------------------------------------1
[b] KM-40B (Singapore) --------------------------------------------------------------------------2
[c] KM-40B (Australia, New Zealand) ---------------------------------------------------------3
[d] KM-40B (Philippines)--------------------------------------------------------------------------4
[e] KM-55B (Europe)-------------------------------------------------------------------------------5
[f] KM-55B (Singapore) ---------------------------------------------------------------------------6
[g] KM-55B (Australia, New Zealand) ---------------------------------------------------------7
[h] KM-55B (Philippines)--------------------------------------------------------------------------8
[i] KM-80B (Europe)--------------------------------------------------------------------------------9
[j] KM-80B (Singapore)-------------------------------------------------------------------------- 10
[k] KM-80B (Australia, New Zealand) ------------------------------------------------------- 11
[l] KM-80B (Philippines)------------------------------------------------------------------------- 12
II. GENERAL INFORMATION ----------------------------------------------------------------------- 13
1. CONSTRUCTION -------------------------------------------------------------------------------- 13
[a] KM-40B, KM-55B----------------------------------------------------------------------------- 13
[b] KM-80B ----------------------------------------------------------------------------------------- 14
[c] ICEMAKING COMPARTMENT ----------------------------------------------------------- 15
2. SEQUENCE OF OPERATION ---------------------------------------------------------------- 16
[a] ONE MINUTE FILL CYCLE---------------------------------------------------------------- 16
[b] INITIAL HARVEST CYCLE ---------------------------------------------------------------- 16
[c] FREEZE CYCLE ----------------------------------------------------------------------------- 16
[d] DRAIN CYCLE-------------------------------------------------------------------------------- 16
[e] NORMAL HARVEST CYCLE ------------------------------------------------------------- 17
3. CONTROAL BOARD ---------------------------------------------------------------------------- 19
[a] CONTROL BOARD LAYOUT ------------------------------------------------------------- 20
[b] FEATURES ------------------------------------------------------------------------------------ 21
[c] CONTROLS AND ADJUSTMENTS------------------------------------------------------ 23
[d] CONTROL BOARD CHECK PROCEDURE------------------------------------------- 27
[e] CONTROL BOARD REPLACEMENT--------------------------------------------------- 28
4. THERMISTOR------------------------------------------------------------------------------------- 28
5. BIN CONTROL SWITCH ----------------------------------------------------------------------- 29
[a] EXPLANATION OF OPERATION-------------------------------------------------------- 29
[b] BIN CONTROL CHECK PROCEDURE ------------------------------------------------ 29
6. SWITCHES ---------------------------------------------------------------------------------------- 30
III. TECHNICAL INFORMATION -------------------------------------------------------------------- 31
1. WATER CIRCUIT AND REFRIGERANT CIRCUIT--------------------------------------- 31
[a] KM-40B, KM-55B----------------------------------------------------------------------------- 31
[b] KM-80B ----------------------------------------------------------------------------------------- 32
2. WIRING DIAGRAM ------------------------------------------------------------------------------ 33
[a] KM-40B (Philippines)------------------------------------------------------------------------ 33
[b] KM-40B (Except Philippines), KM-55B ------------------------------------------------- 33

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[c] KM-80B ----------------------------------------------------------------------------------------- 34
3. TIMING CHART----------------------------------------------------------------------------------- 35
[a] KM-40B, KM-55B, KM-80B ---------------------------------------------------------------- 35
IV. SERVICE DIAGNOSIS---------------------------------------------------------------------------- 36
1. 10-MINUTE DIAGNOSTIC PROCEDURE ------------------------------------------------- 36
2. NO ICE PRODUCTION ------------------------------------------------------------------------- 38
3. EVAPORATOR IS FROZEN UP -------------------------------------------------------------- 41
4. LOW ICE PRODUCTION----------------------------------------------------------------------- 42
5. ABNORMAL ICEOTHERS --------------------------------------------------------------------- 42
6. OTHER---------------------------------------------------------------------------------------------- 43
V. REMOVAL AND REPLACEMENT -------------------------------------------------------------- 44
1. SERVICE FOR REFRIGERANT LINES ---------------------------------------------------- 44
[a] SERVICE INFORMATION ----------------------------------------------------------------- 44
[b] REFRIGERANT RECOVERY------------------------------------------------------------- 45
[c] EVACUATION AND RECHARGE -------------------------------------------------------- 45
2. BRAZING ------------------------------------------------------------------------------------------- 46
3. COMPRESSOR----------------------------------------------------------------------------------- 47
4. DRIER ----------------------------------------------------------------------------------------------- 48
5. HOT GAS VALVE--------------------------------------------------------------------------------- 49
6. EXPANSION VALVE - KM-80B ONLY------------------------------------------------------- 51
7. FAN MOTOR--------------------------------------------------------------------------------------- 53
8. PUMP MOTOR------------------------------------------------------------------------------------ 54
9. WATER VALVE------------------------------------------------------------------------------------ 55
10. DRAIN VALVE------------------------------------------------------------------------------------- 56
11. FLOAT SWITCH ---------------------------------------------------------------------------------- 57
[a] KM-40B, KM-55B----------------------------------------------------------------------------- 57
[b] KM-80B ----------------------------------------------------------------------------------------- 58
12. BIN CONTROL SWITCH ----------------------------------------------------------------------- 59
13. THERMISTOR ------------------------------------------------------------------------------------ 62
14. CONTROL BOX ---------------------------------------------------------------------------------- 63
[a] POWER SWITCH ---------------------------------------------------------------------------- 64
[b] FUSE -------------------------------------------------------------------------------------------- 64
[c] FUSE HOLDER------------------------------------------------------------------------------- 64
[d] CONTROL BOARD -------------------------------------------------------------------------- 64
[e] POWER RELAY ------------------------------------------------------------------------------ 64
[f] COMPRESSOR CAPACITOR - KM-80B ONLY--------------------------------------- 65
[g] CONTROL BOARD TRANSFORMER -------------------------------------------------- 65
15. WATER TANK ------------------------------------------------------------------------------------- 65
16. CUBE GUIDE ------------------------------------------------------------------------------------- 67
17. SEPARATOR -------------------------------------------------------------------------------------- 68
18. SPRAY TUBE, WATER SUPPLY PIPE, SPRAY GUIDE ------------------------------- 68
19. DOOR ----------------------------------------------------------------------------------------------- 69
VI. CLEANING AND MAINTENANCE INSTRUCTIONS-------------------------------------- 70
1. CLEANING ----------------------------------------------------------------------------------------- 70

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[a] CLEANING PROCEDURE----------------------------------------------------------------- 70
[b] SANITIZING PROCEDURE --------------------------------------------------------------- 73
2. MAINTENANCE ---------------------------------------------------------------------------------- 73
[a] EXTERIOR PANELS ------------------------------------------------------------------------ 73
[b] STORAGE BIN AND SCOOP------------------------------------------------------------- 74
[c] AIR FILTER ------------------------------------------------------------------------------------ 74
[d] CONDENSER--------------------------------------------------------------------------------- 74
3. PREPARING THE ICEMAKER FOR LONG STORAGE-------------------------------- 74

1
I. SPECIFICATIONS
1. DIMENSIONS/SPECIFICATIONS
[a] KM-40B (Europe)

2
[b] KM-40B (Singapore)

3
[c] KM-40B (Australia, New Zealand)

4
[d] KM-40B (Philippines)

5
[e] KM-55B (Europe)

6
[f] KM-55B (Singapore)

7
[g] KM-55B (Australia, New Zealand)

8
[h] KM-55B (Philippines)

9
[i] KM-80B (Europe)

10
[j] KM-80B (Singapore)

11
[k] KM-80B (Australia, New Zealand)

12
[l] KM-80B (Philippines)

13
Top Panel Separator Spray Tube
Evaporator
Door Water Supply
Tube
Front Panel
Tank
Louver
Control Box
Control Switch
Condenser
Hot Gas Valve Air Filter Fan Motor
Front View
Thermistor
Water Valve
Rear Panel
Pump Motor
Pipe Cover
Power Supply
Cord
Drain Valve
Drier Compressor
Rear View
Rear Cover
Float Switch
With Tank Removed Bin Control Switch
II. GENERAL INFORMATION
1. CONSTRUCTION
[a] KM-40B, KM-55B

14
[b] KM-80B
Top Panel Separator Spray Tube
Evaporator
Door
Water Supply
Tube
Front Panel
Tank
Louver
Control Box
Control
Switch
Condenser
Hot Gas Valve Air Filter Fan Motor Compressor
Front View
Thermistor
Water Valve
Rear Panel
Pump Motor
Pipe Cover
Power Supply
Cord
Drain Valve
Drier
Rear Cover Rear View
Float Switch
With Tank Removed
Bin Control Switch

15
[c] ICEMAKING COMPARTMENT
Water Valve
Spray Tube Water Supply Pipe Evaporator
Pump Motor
Separator
Cube Guide
Float Switch
Water Tank

16
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, 4, 7.
[a] ONE MINUTE FILL CYCLE
LED 8 is on. WV opens and the ll 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.
[b] INITIAL HARVEST CYCLE
LEDs 5, 6, and 8 are on. WV 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 kΩ 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. WV
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 WV 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 F/S and proceeds to the
freeze cycle if it is closed or calls for a 1-minute ll 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 rst 5 minutes after the thermistor temperature reaches 2°C,
the control board will not accept a signal from F/S. This minimum freeze period acts as a
short cycle protection. At the end of this period, F/S assumes control. As the evaporator
cools, the thermistor located on the suction line checks the temperature and PM stops
(see “III. 3. TIMING CHART” for details). This is to prevent slushing. As ice builds on the
evaporator the water level in the sump lowers. The freeze continues until F/S opens and
terminates ice production.
[d] DRAIN CYCLE
LEDs 4, 5, and 6 are on. Comp continues to run, HGV opens, and FMS de-energizes.
PM stops. DV opens for 20 seconds to drain out the water tank. Drain cycle always