Service Manual - Hoshizaki America, Inc.

Service Manual - Hoshizaki America, Inc.
Service Manual
Modular Crescent Cuber
Models
KM-340MAJ, MWJ
KM-515MAJ, MWJ, MRJ
KM-650MAJ, MWJ, MRJ
hoshizakiamerica.com
Number: 73220
Issued: 12-18-2017
WARNING
Only qualified service technicians should install and service the appliance. To
obtain the name and phone number of your local Hoshizaki Certified Service
Representative, visit www.hoshizaki.com. No service should be undertaken until
the technician has thoroughly read this Service Manual. Failure to service and
maintain the appliance in accordance with this manual will adversely affect safety,
performance, component life, and warranty coverage. Proper installation is the
responsibility of the installer. Product failure or property damage due to improper
installation is not covered under warranty.
Hoshizaki provides this manual primarily to assist qualified service technicians in the
service of the appliance.
Should the reader have any questions or concerns which have not been satisfactorily
addressed, please call, send an e-mail message, or write to the Hoshizaki Technical
Support Department for assistance.
Phone: 1-800-233-1940; (770) 487-2331
Fax: 1-800-843-1056; (770) 487-3360
E-mail: [email protected]
618 Highway 74 South
Peachtree City, GA 30269
Attn: Hoshizaki Technical Support Department
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 appliance is serviced. Read
the warnings and guidelines contained in this manual carefully as they provide
essential information for the continued safe use, service, and maintenance of the
appliance. Retain this manual for any further reference that may be necessary.
CONTENTS
Important Safety Information.................................................................................................. 5
I. Construction and Water/Refrigeration Circuit Diagram........................................................ 7
A. Construction................................................................................................................... 7
1. Air-Cooled Models (MAJ).......................................................................................... 7
2. Water-Cooled Models (MWJ).................................................................................... 8
3. Remote Models (MRJ).............................................................................................. 9
B. Water/Refrigeration Circuit Diagram............................................................................. 10
1. Air-Cooled Models (MAJ)........................................................................................ 10
2. Water-Cooled Models (MWJ)...................................................................................11
3. Remote Models (MRJ)............................................................................................ 12
II. Sequence of Operation and Service Diagnosis................................................................ 13
A. Sequence of Operation Flow Chart.............................................................................. 13
1. Operation Flow Chart ............................................................................................. 13
2. Shutdown Flow Chart............................................................................................. 14
3. Freeze-Time Correction Chart................................................................................ 15
B. Service Diagnosis........................................................................................................ 16
C. Freeze-Time Correction Cycle (90 min.)...................................................................... 23
D. Control Board Check.................................................................................................... 25
E. Bin Control Check........................................................................................................ 26
1. Bin Control Check................................................................................................... 26
2. Bin Control Cleaning............................................................................................... 27
F. Float Switch Check and Cleaning................................................................................. 28
1. Float Switch Check................................................................................................. 28
2. Float Switch Cleaning............................................................................................. 29
G. Thermistor Check......................................................................................................... 30
H. Control Switch.............................................................................................................. 30
I. Diagnostic Tables........................................................................................................... 31
J. Freeze-Up Check List................................................................................................... 35
III. Controls and Adjustments................................................................................................ 36
A. Control Board Layout................................................................................................... 37
B. LED Lights and Audible Alarm Safeties........................................................................ 38
3
C. Settings and Adjustments............................................................................................. 39
1. Default Dip Switch Settings..................................................................................... 39
2. Harvest Time (S4 dip switch 1 & 2)........................................................................ 40
3. Pump-Out Time/Harvest Time During Pump-Out (S4 dip switch 3 & 4).................. 40
4. Pump-Out Frequency Control (S4 dip switch 5)...................................................... 41
5. Harvest Pump Time (Harvest Assist) (S4 dip switch 6).......................................... 41
6. Harvest Pump Time (Harvest Assist)/Freeze-Time Correction (S4 dip switch 7)... 42
7. Factory Use (S4 dip switch 8)................................................................................. 42
8. Freeze Timer (S4 dip switch 9 & 10)....................................................................... 43
9. Float Switch Selector (S5 dip switch 1).................................................................. 43
10. Refill Counter (S5 dip switch 2 and 3)................................................................... 43
11. Minimum Harvest Time (S5 dip switch 4).............................................................. 44
12. Anti-Slush (S5 dip switch 5).................................................................................. 44
IV. Refrigeration Circuit and Component Service Information.............................................. 45
A. Refrigeration Circuit Service Information..................................................................... 45
B. Component Service Information................................................................................... 48
C. Water Regulating Valve Adjustment (water-cooled model)........................................... 49
V. Maintenance..................................................................................................................... 50
VI. Preparing the Appliance for Periods of Non-Use............................................................. 51
VII. Disposal.......................................................................................................................... 53
VIII. Technical Information..................................................................................................... 54
A. Specification and Performance Data Sheets................................................................ 54
1. KM-340MAJ............................................................................................................ 54
2. KM-340MWJ........................................................................................................... 55
3. KM-515MAJ............................................................................................................ 56
4. KM-515MWJ........................................................................................................... 57
5. KM-515MRJ with URC-5F...................................................................................... 58
6. KM-650MAJ............................................................................................................ 59
7. KM-650MWJ........................................................................................................... 60
8. KM-650MRJ with URC-5F...................................................................................... 61
B. Wiring Diagrams .......................................................................................................... 62
1. KM-340M_J............................................................................................................. 62
2. KM-515M_J and KM-650M_J................................................................................. 63
4
Important Safety Information
Throughout this manual, notices appear to bring your attention to situations which could
result in death, serious injury, damage to the appliance, or damage to property.
WARNING Indicates a hazardous situation which could result in death or
serious injury.
NOTICE
Indicates a situation which could result in damage to the
appliance or property.
IMPORTANT
Indicates important information about the use and care of the
appliance.
WARNING
The appliance should be destined only to the use for which it has been expressly
conceived. Any other use should be considered improper and therefore dangerous.
The manufacturer cannot be held responsible for injury or damage resulting from
improper, incorrect, and unreasonable use. Failure to service and maintain the
appliance in accordance with this manual will adversely affect safety, performance,
component life, and warranty coverage and may result in costly water damage.
To reduce the risk of death, electric shock, serious injury, or fire, follow basic
precautions including the following:
• Only qualified service technicians should install and service this appliance.
• The appliance must be installed in accordance with applicable national, state, and
local codes and regulations.
• Electrical connection must be hard-wired and must meet national, state, and local
electrical code requirements. Failure to meet these code requirements could result
in death, electric shock, serious injury, fire, or severe damage to equipment.
• The icemaker requires an independent power supply of proper capacity. See the
nameplate for electrical specifications. Failure to use an independent power supply
of proper capacity can result in a tripped breaker, blown fuses, damage to existing
wiring, or component failure. This could lead to heat generation or fire.
• THE ICEMAKER MUST BE GROUNDED. Failure to properly ground the icemaker
could result in death or serious injury.
• Move the control switch to the "OFF" position and turn off the power supply before
servicing. Lockout/Tagout to prevent the power supply from being turned back on
inadvertently.
• To reduce the risk of electric shock, do not touch the control switch with damp
hands.
• Do not make any alterations to the unit. Alterations could result in electric shock,
injury, fire, or damage to the unit.
• The appliance is not intended for use by persons (including children) with reduced
physical, sensory, or mental capabilities, or lack of experience and knowledge,
unless they have been given supervision or instruction concerning use of the
appliance by a person responsible for their safety.
5
WARNING, continued
• Children should be properly supervised around this appliance.
• Do not climb, stand, or hang on the appliance or allow children or animals to do so.
Serious injury could occur or the appliance could be damaged.
• Do not use combustible spray or place volatile or flammable substances near the
appliance. They might catch fire.
• Keep the area around the appliance clean. Dirt, dust, or insects in the appliance
could cause harm to individuals or damage to the appliance.
Additional Warning for Remote Models
• THE REMOTE CONDENSER UNIT MUST BE GROUNDED. The power supply and
ground connection to the remote condenser unit are supplied from the icemaker.
Failure to properly ground the remote condenser unit could result in death or
serious injury.
• Move the icemaker control switch to the "OFF" position and turn off the power
supply to the icemaker before servicing the remote condenser unit.
Lockout/Tagout to prevent the power supply from being turned back on
inadvertently.
NOTICE
• Follow the instructions in this manual carefully to reduce the risk of costly water
damage.
• In areas where water damage is a concern, install in a contained area with a floor
drain.
• Install the appliance in a location that stays above freezing. Normal operating
ambient temperature must be within 45°F to 100°F (7°C to 38°C).
• Do not leave the icemaker on during extended periods of non-use, extended
absences, or in sub-freezing temperatures. To properly prepare the icemaker for
these occasions, follow the instructions in "VI. Preparing the Appliance for Periods
of Non-Use."
• Do not place objects on top of the appliance.
• The dispenser unit/ice storage bin is for ice use only. Do not store anything else in
the dispenser unit/ice storage bin.
6
I. Construction and Water/Refrigeration Circuit Diagram
A. Construction
1. Air-Cooled Models (MAJ)
Thermostatic
Expansion Valve
Water Supply Inlet
Spray Tubes
Hot Gas Valve
Inlet Water Valve
Condenser
Cleaning Valve
Control Switch
High-Pressure
Switch
Splash Guard
Check Valve
(water)
Fan Motor
Drier
Float Switch
Water Pump
Control Box
Compressor
Bin Control and Bracket
Model Shown: KM-340MAJ
7
2. Water-Cooled Models (MWJ)
Thermostatic
Expansion Valve
Water Supply Inlet
Spray Tubes
Hot Gas Valve
High-Pressure Switch
Inlet Water Valve
Water Regulating
Valve
Condenser
Cleaning Valve
Control Switch
Control Box
Splash Guard
Check Valve
(water)
Drier
Float Switch
Liquid Line Valve
Water Pump
Compressor
Bin Control and Bracket
Model Shown: KM-515MWJ
8
3. Remote Models (MRJ)
Thermostatic
Expansion Valve
Spray Tubes
Water Supply Inlet
Inlet Water Valve
Junction Box
Evaporator
Hot Gas Valve
Stainer
Cleaning Valve
High-Pressure Switch
Control Switch
Receiver Tank
Splash Guard
Check Valve
(water)
Drier
Float Switch
Liquid Line Valve
Water Pump
Compressor
Control Box
Crankcase Heater
Bin Control and Bracket
Model Shown: KM-650MRJ
9
B. Water/Refrigeration Circuit Diagram
1. Air-Cooled Models (MAJ)
Spray Tubes
Condenser
Inlet Water Valve
Drier
Evaporator
Water Supply
Fan
High-Pressure
Switch
Liquid Line Valve
(KM-515MAJ and
KM-650MAJ)
Thermistor
Heat
Exchanger
Suction Line
Strainer
Water Pump
Float Switch
Hot Gas
Valve
Water
Tank
Compressor Discharge Line
Drain
Freeze
Pump Out
Thermostatic Expansion Valve
Refrigeration Circuit
Check Valve
Water Circuit
10
2. Water-Cooled Models (MWJ)
Water Regulating Valve
Condenser
Spray Tubes
Inlet Water Valve
Drier
Evaporator
Water Supply
Liquid Line Valve
Thermistor
Heat
Exchanger
High-Pressure
Switch
Suction Line
Strainer
Water Pump
Float Switch
Hot Gas
Valve
Water
Tank
Compressor
Drain
Freeze
Discharge Line
Pump Out
Thermostatic Expansion Valve
Refrigeration Circuit
Check Valve
Water Circuit
11
3. Remote Models (MRJ)
Condenser
Fan
Headmaster
(C.P.R.)
Spray Tubes
Access
Valve
Inlet Water Valve
Drier
Water Supply
High-Pressure
Switch
Receiver
Strainer
Liquid Line
Evaporator Valve
Heat
Exchanger
Thermistor
Hot Gas
Valve
Cleaning Valve
Suction Line
Water Pump
Float Switch
Water
Tank
Discharge Line
Drain
Freeze
Pump-Out
Compressor
Thermostatic Expansion
Valve
Refrigeration Circuit
Check Valve
Water Circuit
12
13
Comp energized
FMR energized
HGV energized
WV energized
FS closed
Thermistor
in control
FS check
Comp energized
FMR energized
HGV energized
PM de-energizes for 2 sec.,
then reverses for 10/20 sec.
FM de-energized
LLV de-energized
Freeze Time Differential Exceeded.
Initiate Freeze-Time Correction Cycle.
See "II.A.3. Freeze-Time Correction Cycle.
Anti-Slush
Thermistor temperature
reaches 36°F (2.2°C)
(5.8 kΩ).
PM de-energized for
10 sec.
FS opens or freeze
timer terminates
FS in control
• Factory set for every 10th
cycle
(S4 dip switch 5)
• Pump motor stops for
2 sec., then reverses for
10/20 sec.
(S4 dip switch 3 & 4)
4. Pump-Out Cycle
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 restart when the control switch is placed in the "ICE" position.
Comp energized
FM energized
FMR energized
PM energized
LLV energized
HGV de-energized
FS closed
5-min.
minimum
freeze timer in
control
• Min. freeze time: 5 min.
• Max. freeze time: freeze timer setting (S4 dip
switch 9 & 10)
• Freeze-Time monitoring for Freeze-Time
Correction starts at 2nd freeze cycle.
3. Freeze Cycle
Components Energized when the Control Switch is in the "WASH" Position
FS open
Thermistor temperature reaches
48°F (9°C) (3.9 kΩ or less). Harvest
timer starts.
PM energized
WV de-energized
50 sec.
Harvest Pump
Timer
1 to 3-min. harvest timer in
control (S4 dip switch 1 & 2)
• WV time: 6 min. or the length of harvest minus 50 sec.
(S4 dip switch 7), whichever is shorter. Do not adjust S4
dip switch 7 out of the factory position.
• Max. harvest time: 20 min.
2. Harvest Cycle
If FS is open, Comp stops and cycle returns to
1-Min. fill.
FS open
WV energized
FS check
1. 1-Minute
Fill Cycle
1. Operation Flow Chart
Legend:
BC–bin control
Comp–compressor
FM–fan motor
FMR–fan motor-remote
FS–float switch
HGV–hot gas valve
LLV–liquid line valve
PM–pump motor
WV–inlet water valve
Startup
Cycle
Steps
Operation Flow Chart
II. Sequence of Operation and Service Diagnosis
A. Sequence of Operation Flow Chart
BC Operation
Shutdown
and Restart
14
Legend:
BC–bin control
BC open (BC actuator paddle engaged)
Green "BC CLOSED" LED off
Yellow "BC OPEN" LED on
All components de-energized.
2. Icemaker Off
BC closed
(BC actuator paddle disengaged)
Green "BC CLOSED" LED on
Yellow "BC OPEN" LED off
To 1. 1-Minute Fill Cycle
Icemaker starts at
"1. 1-Minute Fill Cycle."
3. Ice Level Lowered
Control board retains freeze-time correction count data
between bin control restarts.
Yellow "BC OPEN" LED continues. All
components de‑energized.
Shutdown Delay:
• Fill Cycle–15 sec. after activation.
• Harvest Cycle–At the end of the harvest cycle, or up
to 15 sec. into the freeze cycle if activated at the end of the harvest cycle.
• Freeze Cycle– 15 sec. after activation if activated at least
15 sec. before the 5-min. short cycle
protection timer terminates.
Otherwise, at the end of the next harvest
cycle.
1. Bin Full
Shutdown Flow Chart
2. Shutdown Flow Chart
15
254
309
349
380
406
427
446
462
3
4
5
6
7
8
9
10
Note: When 1st freeze-time correction cycle
is initiated, CB "POWER OK" LED starts
blinking. On 2nd freeze-time correction cycle,
if CB "POWER OK" LED has been reset,
CB "POWER OK" LED starts blinking. If CB
"POWER OK" had not been reset after 1st
freeze-time correction cycle CB "POWER
OK" LED continues to blink.
After 3rd freeze‑time correction cycle in
36 hours, CB yellow "EXT HARVEST" LED
starts blinking.
Appliance continues to operate and LEDs
continue to blink until ALARM RESET button
is pressed with power on.
Differential
Value in Sec.
Number of
Freeze Cycles
Freeze Time Differential Exceeded.
Minimum and Maximum Freeze times have
exceeded differential parameters.
Freeze-Time Correction function is enabled
when S4 Dip Switch 7 is in the "ON" position.
CB monitors freeze time. After 3 freeze
cycles, CB compares the minimum and
maximum differential of the 3 freeze cycle
times. Every freeze cycle time after the third
freeze cycle time is added to the minimum/
maximum calculation.
Example: After 8 cycles, if the differential
between the shortest cycle (minimum) and
the longest cycle (maximum) is equal to or
greater than 427 sec. a freeze-time correction
cycle is initiated:
Comp energized
FMR energized
HGV energized
PM energized
WV energized
Appliance Cycle Reset and Alarm Reset:
Cycle Reset: Power Supply or Control Switch Turned Off and On again:
Appliance turns off, then re-starts at 1.Fill Cycle.
Alarm Reset: CB "ALARM RESET" pressed during or after a freeze-time
correction cycle with power supply on:
Appliance continues cycle with no interruption or reset.
CB red "POWER OK" LED blinking:
CB red "POWER OK" LED resets to solid.
CB yellow "EXT HARVEST" LED blinking:
CB yellow "EXT HARVEST: LED turns off.
WV energized
Comp de-energized
FMR de-energized
HGV de-energized
PM de-energized
2. 10-Minute Fill/
Overflow
After 5th 10-Minute Harvest Pump Cycle with WV
Freeze-Time Correction Cycle Complete.
Go to Step "3. Freeze Cycle" in Operation Flow Chart.
• Do not adjust S4 dip switch 7 out of the factory position.
• After step 2 completes 4th sequence (80 min. completed), repeat
step 1 for 5th and final time.
1. 10-Minute Harvest Cycle with WV
Legend:
Comp–compressor
FM–fan motor
FMR–fan motor-remote
HGV–hot gas valve
PM–pump motor
WV–inlet water valve
Start
Cycle Steps
Steps 1 and 2 repeat
4 times (total 80 min.),
then step 1 repeats for
a 5th time to complete
Freeze‑Time Correction
Cycle.
2A7664-02 Freeze-Time Correction Flow Chart
3. Freeze-Time Correction Chart
B. Service Diagnosis
WARNING
• The appliance should be diagnosed and repaired only by qualified service
personnel to reduce the risk of death, electric shock, serious injury, or fire.
• Risk of electric shock. Control switch in "OFF" position does not de‑energize all
loads Use extreme caution and exercise safe electrical practices.
• Moving parts (e.g., fan blade) can crush and cut. Keep hands clear.
• Before servicing the appliance, move the control switch to the "OFF" position and
turn off the power supply.
• CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are
securely in place after the appliance is serviced. Make sure that none have fallen
into the dispenser unit/ice storage bin.
• Make sure all food zones in the appliance and dispenser unit/ice storage bin are
clean after service.
The diagnostic procedure is a sequence check that allows you to diagnose the electrical
system and components. Before proceeding, check for correct installation, proper voltage
per nameplate, and adequate water supply. Check CB using the steps in "II.D. Control
Board Check." Check dip switch settings to assure that S4 dip switches and S5 dip
switches 1 through 5 are in the factory default position. S4 dip switch 1, 2, 3, 4, and 5 are
cleaning adjustments and the settings are flexible. For factory default settings, see "III.C.1.
Default Dip Switch Settings."
Note: • When checking high voltage (115VAC), always choose a white (W) neutral wire to
establish a good neutral connection.
• When checking voltage from the CB K1 connector (10 pin connector), pull
CB K1 connector out slightly to allow room for multimeter test leads contact.
1) Turn off the power supply, then access the control box. Move the control switch to the
"OFF" position. Clear any ice from BC.
2) Check that the 115VAC 10A fuse is good.
16
1. Sequence and Component Diagnosis
3) Power On: Turn on the power supply, then move the control switch to the "ICE" position.
A 5‑sec. delay occurs. CB red "POWER OK" LED and CB green "BC CLOSED" LED
turn on. If CB yellow "BC OPEN" LED is on (indicating a full bin), check BC. Move ice
away from BC actuator paddle. If CB yellow "BC OPEN" LED stays on, see "II.E.1. Bin
Control Check."
Note: • CB red "POWER OK" LED remains on unless the 10.5VAC power supply is
interrupted (K2 connector).
• Check CB using the steps in "II.D. Control Board Check."
• Confirm CB green "BC CLOSED" LED is on. If CB yellow "BC OPEN" LED is on,
remove ice from BC. If no ice is around BC and CB yellow "BC OPEN" LED is
on, see "II.E.1. Bin Control Check."
a) Power On Diagnosis: If CB red "POWER OK" LED is off, confirm 10A fuse is good.
Check for 115VAC at control switch #1 (BK) to neutral (W) then at control switch
#2 (P) to neutral (W). If 115VAC is present on #1 (BK) and not on #2 (P), replace
control switch. If 115VAC is present on control switch #2 (P), check for 115VAC at
HPS (P) to neutral (W) then HPS (BK) to neutral (W). If 115VAC is present at HPS
(P) and not at HPS (BK), HPS is open. See HPS Diagnosis below. If 115VAC is
present at HPS (BK), check for 10.5VAC at CB K2 #1 red wire to CB K2 #2 red wire.
If 10.5VAC is not present, check that the cleaning valve is closed and the interlock
switch is closed. Next, check CT continuity. If open, replace CT.
b) HPS Diagnosis: Check that the condenser coil is not clogged or restricted. Let
refrigeration circuit pressures equalize. If HPS does not reset and pressures are
equalized, replace HPS. If pressures are not equalized, reclaim refrigerant and
diagnose refrigeration circuit restriction. Check that there are no restrictions in the
refrigeration circuit.
Harvest Cycle: HGV, strainer, or check valve.
Freeze Cycle: FM, FMR, TXV, WRV, HM, LLV, strainer, check valve, drier, and
damaged line set or fitting.
Confirm that the location meets installation requirements:
• The appliance is not intended for outdoor use. Normal operating ambient temperature
should be within 45°F to 100°F (7°C to 38°C).
• Allow 6" (15 cm) clearance at rear, sides, and top for proper air circulation and ease
of maintenance and/or service should they be required.
• The appliance should not be located in a corrosive environment.
17
4) 1-Min. Fill Cycle – LED 4 is on. WV and X11 relay energize. After 1 min., CB checks for
a closed FS. If FS is closed, the harvest cycle begins. If harvest cycle begins (Comp,
HGV, FMR energized), continue to step 5a. If FS is open, WV remains energized until
FS closes (low water safety protection during initial start up and at the end of each
harvest). Diagnosis: Check that water enters the water tank. If not, check that the water
supply line shut-off valve is open and screens or external filters are clear. Check for
115VAC at CB K1 #6 (O) to neutral (W). If 115VAC is not present, replace CB. If 115VAC
is present, and WV does not energize, check for 115VAC at WV. If 115VAC is present,
check coil continuity. If open, replace WV. If the water tank fills, but the appliance fails to
start harvest (Comp energized), check for open FS. See "II.F. Float Switch Check and
Cleaning." If FS is closed and CB fails to start the harvest cycle after 1 min., replace
CB.
5a) Initial Harvest Cycle – LEDs 1, 4, and 2 are on. WV and X11 relay continue. Comp,
FMR, HGV, and X10 relay energize. CB monitors the warming of the evaporator via
the thermistor located on the suction line. When the thermistor reaches 48°F (9°C),
CB reads 3.9 kΩ from the thermistor and turns harvest termination over to the harvest
timer (S4 dip switch 1 & 2 and S5 dip switch 4). WV and X11 relay are energized during
harvest for a maximum of 6 min. or the length of harvest minus HPT setting (S4 dip
switch 6), whichever is shorter. See step 5b below.
a) Comp Diagnosis: Check that evaporator is warming. If not, confirm that Comp
energizes. If not, check for 115VAC at CB K1 #1 or #9 (V) to neutral (W). If 115VAC is
not present, check for 115VAC at CB K1 #7 or #10 (BK) to neutral (W). If 115VAC is
present at #7 or #10 (BK) and not at #1 or #9 (V), replace CB. If 115VAC is present,
check for 115VAC at CR solenoid. If 115VAC is present, confirm contacts are closed.
If not, replace CR. If CR contacts are closed, check Comp external overload, Comp
start and run capacitors, Comp start relay, and Comp motor winding.
b) HGV Diagnosis: If Comp is energized and evaporator is not warming, check that
HGV energizes and opens. Check for 115VAC at CB K1 #2 (P) to neutral (W).
If 115VAC is not present and LED 2 is on, replace CB. If 115VAC is present, check for
115VAC at HGV coil and check HGV coil continuity. Replace as needed.
c) LLV Diagnosis: Confirm that LLV is de-energized and closed (not bypassing).
If energized, replace CB. If de-energized and bypassing, replace LLV.
d) WRV Diagnosis: Confirm WRV is not leaking by. If WRV is leaking by, confirm HGV
is open and LLV is closed. Next, check for proper refrigerant pressures. If refrigerant
pressures are correct, adjust or replace WRV. See "IV.C. Water Regulating Valve
Adjustment (water‑cooled models).".
18
5b) Harvest Pump Time (Harvest Assist) – LEDs 1, 3, and 2 are on. When the
thermistor reaches 48°F (9°C), CB reads 3.9 kΩ from the thermistor and turns harvest
termination over to the harvest timer (S4 dip switch 1 & 2 and S5 dip switch 4).
When WV de-energizes, LED 4 turns off, X11 relay de-energizes and LED 3 turns on.
PM energizes. Comp, FMR, HGV, and X10 relay continue.
Diagnosis: Place a thermometer on the suction line next to the thermistor. Has it
warmed to 48°F (9°C) or warmer? Confirm thermistor status. See "II.G Thermistor
Check." If the thermistor reading is in proper range, dip switch 7 is on, and PM does
not energize before harvest terminates, replace CB. If WV continues, check for 115VAC
at CB K1 #6 (O). If 115VAC is present, and LED 4 is off, replace CB. If LED 3 is on
and PM is not energized, check for 115VAC at CB K1 #5 (DBU). If 115VAC is not
present, replace CB. If 115VAC is present and PM is not energized, check for 115VAC
at X10 relay terminal #7 (Y) to neutral (W). If 115VAC is not present, check for 115VAC
at X10 relay terminal #3 (P) to neutral (W) and X10 relay terminal #5 (Y) to neutral (W).
If 115VAC is present on terminal #3 (P) and not on terminal #5 (Y), replace X10 relay.
If 115VAC is present on X10 relay terminal #7 (Y) and PM is not energized, check for
115VAC at X10 relay terminal #4 (R) to neutral (W) and terminal #6 (DBU) to neutral
(W). If 115VAC is present on terminal #6 (DBU) and not on terminal #4 (R), replace
X10 relay. If 115VAC is present on X10 relay terminal #4 (R), check control switch
contact continuity between terminals #4 (R) and #5 (W/R). If contacts are open, replace
control switch. If contacts are closed and 115VAC is present between control switch
terminal #5 (W/R) and neutral (W), check PM capacitor and motor winding continuity.
5c) Initial Harvest Cycle Termination Diagnosis: When the thermistor reaches 48°F
(9°C), CB reads 3.9 kΩ from the thermistor and turns harvest termination over to
the harvest timer (S4 dip switch 1 & 2 and S5 dip switch 4). Check discharge line
temperature. For a thermistor check, see "II.G. Thermistor Check." If 1-min. fill cycle
starts after harvest timer terminates, check that FS is clean and operating properly, see
"II.F. Float Switch Check and Cleaning." If FS is closed, CB proceeds to the next cycle.
If not, replace CB.
Note: The minimum total time allowed by CB for a complete harvest cycle is based on
S5 dip switch 4. Maximum harvest time allowed is 20 min.
NOTICE! S4 dip switch 7 must remain on. Otherwise, PM will not energize during
the last seconds of harvest.
6) Freeze Cycle – LED 1 is on. Comp, FMR, and PM continue. FM and LLV energize.
HGV and X10 relay de‑energize. Appliance is held in freeze by a 5-min. short cycle
protection timer. After 5-min. short cycle protection timer terminates and FS opens,
freeze cycle terminates.
Note: PM power supply switches from CB K1 #5 (DBU) in harvest to K1 #4 (R) in freeze.
Anti-Slush: When anti-slush is enabled (S5 dip switch 5 "ON"), PM de-energizes when
thermistor reaches 36°F (2.2°C) (5.8kΩ) for 10 sec. then, energizes for the remainder of
the freeze cycle.
19
a) Freeze Cycle Diagnosis: Confirm Comp, FMR, and PM continue. Confirm that
FM and LLV energize. Confirm WRV opens. Next, confirm HGV and X10 relay
de-energize. During the first 5 min. of freeze, confirm evaporator is cooling. If not,
confirm WV de-energized (not leaking by), HGV de-energized (not bypassing), LLV
and FM energize, TXV and HM operate correctly, WRV opens, Comp is efficient,
and refrigerant charge is correct. See "VIII.A. Specification and Performance Data
Sheets."
b) Comp and FMR Diagnosis: If Comp and FMR de-energize once freeze begins,
check that appliance has not shut off on HPS (CB "POWER OK" LED off). If so,
check "3)b) HPS Diagnosis" above. If CB "POWER OK" LED is on, check for 115VAC
at CB K1 #1 (V) or #9 (V) to neutral (W). If 115VAC is not present and LED 1 is on,
replace CB. If 115VAC is present, check for 115VAC at CR coil. If 115VAC is present,
check CR coil and contact continuity. Replace as needed. If CR is okay, check Comp
start relay and start and run capacitors. Next, check Comp motor winding continuity.
If Comp is energized but evaporator is not cooling, check for an inefficient Comp.
See "VIII.A. Specification and Performance Data Sheets." If Comp is energized but
FMR is not, check for 115VAC at the FMR junction box. If 115VAC is not present,
check icemaker wiring connections. If 115VAC is present, check for voltage at
condenser unit. If 115VAC is not present, check field wiring connections. If 115VAC is
present, check FMR capacitor, motor winding, and fan blade for binding.
c) WV and HGV Diagnosis: If WV is energized, check for 115VAC at CB K1 #6 (O)
to neutral (W). If 115VAC is present after PM energizes in harvest cycle, replace
CB. If 115VAC is not present, replace WV (bypassing). If HGV did not de‑energize
at the end of harvest, check for 115VAC at CB K1 #2 (P) to neutral (W). If 115VAC
is present and LED 3 is off, replace CB. If 115VAC is not present, replace HGV
(bypassing).
d) PM Diagnosis: Confirm water is flowing over evaporator from PM and not WV. If PM
de-energizes once freeze begins, check for 115VAC at CB K1 #4 (R) to neutral (W).
If 115VAC is not present, replace CB. If 115VAC is present and PM is de-energized,
check for 115VAC at control switch #5 (W/R) to neutral (W). If 115VAC is present at
CB K1 #4 (R) and not at control switch #5 (W/R), check control switch continuity
between #5 (W/R) and #4 (R). Replace as needed. If 115VAC is present at control
switch #5 (W/R) to neutral (W), check PM capacitor and motor winding continuity.
e) FM and LLV Diagnosis: If FM or LLV does not energize, check for 115VAC at CB
K1 #3 (BK) to neutral (W). If 115VAC is not present, replace CB. If 115VAC is present:
For FM, check capacitor, motor winding, and blade for binding.
For LLV, check coil voltage and continuity.
20
f) Refrigerant Pressures, HM, and TXV Diagnosis: If evaporator is still not cooling,
check refrigerant pressures. See "VIII.A. Specification and Performance Data
Sheets."
Next, check HM operation. If refrigeration pressures are above HM setpoint and
HM is bypassing, replace HM. Check TXV for proper operation. Remove TXV bulb
and hold it in your hand, refrigerant low-side pressure should rise, place TXV bulb in
ice water, refrigerant low-side pressure should drop. A 10 to 15 pound pressure swing
between warm and cold conditions indicate a good TXV. If a 10 to 15 pound swing is
not present, replace TXV.
g) WRV Diagnosis: WRV is factory set and generally no adjustment is required.
If WRV fails to open in freeze, check for proper refrigerant pressures. See "VIII.A.
Specification and Performance Data Sheets." If refrigerant pressures are correct and
WRV does not open, adjust or replace as needed. See "IV.C. Water Regulating Valve
Adjustment (water‑cooled models)."
h) Freeze Termination Diagnosis: After 5 min. in freeze, disconnect CB K5 FS
connector. 15 sec. later appliance should switch out of the freeze cycle (15 second
delay after FS opens before terminating the freeze cycle). If appliance remains in
freeze longer than 15 sec. after FS removed, replace CB. If appliance switches with
FS removed but would previously not switch out of freeze with FS connected (long
freeze - 3 beep alarm), see "II.F. Float Switch Check and Cleaning."
Note: Normal freeze cycle will last 20 to 40 min. depending on model and conditions.
Cycle times and pressures should follow performance data provided in this
manual. See "VIII.A. Specification and Performance Data Sheets."
i) Short Freeze Cycle Diagnosis: Confirm water tank fills and overflows during 1 min.
fill and harvest cycles. If not, check water supply filters, shut-off valve, WV screen.
If water tank empties before 5 min. timer terminates and freeze cycle is short, check
that CV is not leaking by (water flowing down the potable drain). If CV is leaking by,
remove and clean CV, replace rubber seat and spring if necessary. If water tank is
full, see "II.F. Float Switch Check and Cleaning." for erratic operating FS.
7) Pump-Out Cycle – LEDs 1, 3, and 2 are on (10/20 second pump-out). Timing of the
first pump-out is determined by S4 dip switch 5. See the table below.
Control Board Settings
S4 Dip Switch Setting
Pump-Out Frequency
Control Board
OFF
Every 10 cycles
After 11th freeze cycle
ON
Every cycle
After 2nd freeze cycle
No. 5
Comp and FMR continue, HGV and X12 relay energize.
Note: If S4 dip switch 3 & 4 are set to 3 off and 4 on, LED 4 turns on and WV and X11
relay energize, energizing X10 relay. NOTICE! S4 dip switch 3 & 4 must not be set
to 3 off and 4 on. Otherwise, PM will rotate in freeze cycle direction instead of
pump‑out direction.
21
FM and LLV de‑energize. PM stops for 2 sec., then reverses for 10/20 sec. depending
on pump‑out timer (S4 dip switch 3 & 4) setting. When the pump‑out timer terminates,
pump‑out is complete. The pump-out frequency control (S4 dip switch 5) is factory set,
and generally no adjustment is required. However, the pump‑out frequency control can
be set to have a pump-out occur every 10 cycles or every cycle. For details, see "III.C.4.
Pump‑Out Frequency Control (S4 dip switch 5)."
Pump-Out Diagnosis: In the freeze cycle before pump-out (see table above), after
5 min. of freeze disconnect CB black K5 connector (FS connector). Check that PM
stops and re-starts. Next, check that PM rotation is correct (water flowing down the
drain through CV). If PM does not stop and re-start, check that CB LEDs 1, 3, and
2 are on. If not, replace CB. If LEDs 1, 3, and 2 are on and PM does not energize,
check for 115VAC at CB K1 #5 (DBU) to neutral (W). If 115VAC is not present, replace
CB. If 115VAC is present, check that X10 relay is de-energized. If not, check X11 relay
status. If X11 relay is energized, replace CB. If X11 relay is de-energized and X10 relay
is energized, replace X11 relay (contacts sticking). If X10 relay is de-energized, check
for 115VAC at terminal #6 (DBU) to neutral (W) and terminal #2 (DBU) to neutral (W).
If 115VAC is present on terminal #6 (DBU) and not on terminal #2 (DBU), replace
X10 relay. If 115VAC is present on X10 terminal #2 (DBU) and PM is not energized
check for 115VAC at X12 terminal #6 (DBU) to neutral (W) and X12 terminal #4 (DBU)
to neutral (W). If 115VAC is present on X12 terminal #6 (DBU) and not on X12 terminal
#4 (DBU), check for 115VAC at X12 terminal #7 (P) to X12 terminal #8 (W). If 115VAC
is not present, check CB K1 pin #2 (P) wiring for loose connection. If 115VAC is
present and X12 is not energized, check coil continuity. Replace as needed. If X12
is energized and X12 terminal #4 (DBU) does not have 115VAC, replace X12 relay
(contacts sticking). If X12 terminal #4 (DBU) has 115VAC, PM should be energized and
rotating in pump-out rotation. If not, check PM motor windings and impellar for binding.
If energized and rotating correctly, make sure the drain line is not clogged and that CV
is clean and operating properly.
Confirm FM and LLV de-energize. If FM or LLV are energized with LEDs 1, 3, and 2 on,
replace CB.
8) Normal Harvest Cycle – Same as the initial harvest cycle. Return to step 5a) above.
Note: Appliance continues to cycle until BC is satisfied or power is switched off.
The appliance always restarts at the 1-min. fill cycle.
2. Shutdown Diagnosis
1) See "II.E.1. Bin Control Check."
3. Freeze-Time Correction Cycle Diagnosis
1) See "II.C. Freeze-Time Correction Cycle."
Legend: BC–bin control; CB–control board; Comp–compressor; CV–check valve;
FM–fan motor; FMR–fan motor remote; FS–float switch; HGV–hot gas valve;
HM–headmaster (C.P.R.); HPS–high-pressure switch; LLV–liquid line valve;
PM–pump motor; TXV–thermostatic expansion valve; WRV–water regulating Valve;
WV–inlet water valve
22
C. Freeze-Time Correction Cycle (90 min.)
Freeze-Time Correction function is enabled when S4 Dip Switch 7 is in the "ON" position
and initiates when the minimum and maximum freeze times have exceeded differential
parameters. Freeze-time correction timer and count starts at the beginning of the 2nd
freeze cycle after startup from power off condition. Freeze-time correction timer and count
continues and retains its freeze-time correction timer and count during a BC off cycle
and resumes its freeze‑time correction timer and count on the 2nd freeze cycle after BC
restart. If freeze‑time differential is exceeded (see table below), freeze‑time correction
cycle starts and CB red "POWER OK" LED blinks. When freeze‑time correction cycle
occurs 3 or more times within a 36 hour period, CB yellow "EXT HARVEST" LED blinks
with CB red "POWER OK" LED. Appliance starts in freeze cycle after a freeze‑time
correction cycle. To reset CB LEDs, press ALARM RESET button on CB with power on.
CB resets LEDs and appliance continues cycle without interruption.
1) Freeze Time Differential Initiation: CB starts monitoring freeze times on the second
freeze time. After 3 freeze cycles (4th total), CB begins to compare minimum and
maximum freeze time cycles. Every freeze cycle time after the first freeze cycle
time is added to the freeze time list. Minimum and maximum freeze time differential
comparisons begin on the third cycle and are monitored up to 10 cycles. On the 11th
cycle the first freeze cycle time is dropped to maintain the 10 maximum number of
cycles.
Example: After 8 cycles (excluding first cycle), if the differential between the
shortest cycle (minimum) and the longets cycle (maximum) is equal to or greater than
427 sec. a freeze-time correction cycle is initiated:
Number of
Freeze Cycles
Differential
Value in Sec.
3
4
5
6
7
8
9
10
254
309
349
380
406
427
446
462
23
2) Freeze-Time Correction Sequence:
First occurrence within 36 hr., minimum and maximum freeze times have exceeded
differential parameters. CB "POWER OK" LED starts blinking. Freeze-Time Correction
Cycle starts.
Second occurrence within 36 hr., minimum and maximum freeze times have exceeded
differential parameters. If not reset, CB "POWER OK" LED continues blinking. If reset
from first occurrence, CB "POWER OK" LED starts blinking. Freeze-Time Correction
Cycle starts.
Third occurrence within 36 hr. minimum and maximum freeze times have exceeded
differential parameters. CB yellow "EXT HARVEST" LED starts blinking. Also, If not
reset, CB "POWER OK" LED continues blinking. If reset, CB "POWER OK" LED starts
blinking.Freeze-Time Correction Cycle starts.
Total freeze-time correction cycle last for 90 min. At the end of 80 min., the final step
initiates and final Harvest Pump Time (Harvest Assist) with WV (10‑min.) starts. Once
the final Harvest Pump Time (Harvest Assist) with WV (10-min.) terminates
(90 min. complete), normal freeze cycle begins.
2a) 10-Min. Harvest Pump Time (Harvest Assist) with WV: CB "POWER OK" LED
blinking. CB LEDs 1, 4, 3, and 2 are on and Comp, FMR, HGV, PM, and WV energize.
10-min. timer starts. Once 10‑min. timer terminates, CB LEDs 1, 3, and 2 turn off and
Comp, FMR, HGV, and PM de-energize. WV continues.
2b) 10-Min. Fill: CB LED 4 on and WV energized. 10-min. timer starts.
2c) Final 10-Min. Harvest Pump Time (Harvest Assist) with WV: CB "POWER OK" LED
blinking. Once 10‑min. timer terminates, CB LEDs 1, 4, 3, and 2 are on and Comp,
FMR, HGV, and PM energizes. WV continues. 10-min. timer starts. Once 10-min.
timer terminates, normal freeze cycle begins. CB LED 1 on and Comp, FMR, and PM
continue. HGV and WV de-energize.
Note: After 3rd Freeze-Time Correction Cycle in 36 hours, CB signals with blinking CB
yellow "EXT HARVEST" LED. Appliance continues normal operation.
CB "POWER OK" LED and CB yellow "EXT HARVEST" LED continue blinking in
normal operation sequence.
3) Appliance Cycle Reset and CB Alarm Reset:
Cycle Reset: Power supply or control switch turned off and on again: Appliance turns
off, then re-starts at 1.Fill Cycle.
Alarm Reset: CB "ALARM RESET" pressed during or after a freeze-time correction
cycle with power supply on: Appliance continues cycle with no interruption or reset.
CB red "POWER OK" LED blinking: CB red "POWER OK" LED resets to solid.
CB yellow "EXT HARVEST" LED blinking: CB yellow "EXT HARVEST: LED turns off.
Legend: BC–bin control; CB–control board; Comp–compressor; CR–compressor relay;
CT–control transformer; CV–check valve; FM–fan motor; FMR–fan motor remote;
FS–float switch; HGV–hot gas valve; HM–headmaster (C.P.R.); HPS–high-pressure
switch; LLV–liquid line valve; PM–pump motor; TXV–thermostatic expansion valve;
WRV–water regulating valve; WV–inlet water valve
24
D. Control Board Check
Before replacing CB that does not show a visible defect and that you suspect is bad,
always conduct the following check procedure. This procedure will help you verify your
diagnosis.
Alarm Reset: If CB is in alarm (beeping), press the "ALARM RESET" button on CB
while CB is beeping. WARNING! Risk of electric shock. Care should be
taken not to touch live terminals. Once reset, the icemaker starts at the
1-minute fill cycle. For audible alarm information, see "III.B. LED Lights and
Audible Alarm Safeties."
1) Check the dip switch settings to assure that S4 dip switch 3, 4, 7, 8, 9, 10 and S5 dip
switch 1 through 5 are in the factory default position. S4 dip switch 1, 2, 5, 6 are
cleaning adjustments and the settings are flexible. For factory default settings, see
"III.C.1. Default Dip Switch Settings."
2) Move the control switch to the "ICE" position. If the red CB "POWER OK" LED is on,
control voltage is good, continue to step 3. If CB "POWER OK" LED is off, check CT
secondary circuit. CT output is 10.5VAC at 115VAC primary input. If the secondary
circuit has proper voltage and the red LED is off, replace CB.
If the secondary circuit does not have proper voltage, check CT primary circuit. Check
for 115VAC at CB K1 connector pin #10 (BR) to neutral (W) for 115VAC. Always choose
a white (W) neutral wire to establish a good neutral connection when checking voltages.
For additional checks, see "II.G.1. No Ice Production."
3)The "OUTPUT TEST" button provides a relay sequence test. Make sure the control
switch is in the "ICE" position, then press the "OUTPUT TEST" button. For the correct
lighting sequence, see the table below. Note that the order of the LEDs from the outer
edge of the control board is 1, 4, 3, 2. Components (e.g., compressor) cycle during the
test.
Following the test, the icemaker begins operation at the 1-minute fill cycle. If the LEDs
do not light as described above, replace CB.
4) To verify voltage output from CB to the components, slide the CB K1 connector out far
enough to allow multimeter lead contact. With the icemaker in the cycle to be tested,
check output voltage from the corresponding pin on CB K1 connector to a neutral
(W wire). If output voltage is not found and the appropriate LED is on, replace CB.
Legend: CB–control board; CT–control transformer
25
E. Bin Control Check
1. Bin Control Check
This appliance uses a lever-actuated proximity switch to control the ice level in the
storage bin. No adjustment is required.
To check BC, follow the steps below.
1) Turn off the power supply.
2) Remove the front panel, then move the control switch to the "OFF" position.
3) Remove the control box cover.
BC Connector
4) Remove the base cover and clear any ice away from BC.
5) Disconnect BC connector from CB K4 connector.
6) Check for continuity across the wires of
BC connector. When the actuator paddle is
not engaged, BC switch is closed. If open,
check that the actuator paddle is not
sticking. Clean if necessary. See "II.E.2. Bin
Control Cleaning." If BC switch still reads
open, replace BC.
7) Press and hold the actuator paddle;
check for continuity across the wires
of BC connector. When the actuator
paddle is engaged, BC switch is open.
If closed, check that the actuator paddle
is not restricted. Clean if necessary. See
"II.E.2. Bin Control Cleaning." If BC switch
still reads closed, replace BC.
Bin Control
Bracket
BC
Actuator
Paddle
Fig. 1
8) Reconnect BC connector to CB K4 connector, then move the control switch to the "ICE"
position. Turn on the power supply.
9) Check that CB green "BC CLOSED" LED is on.
10) Allow the icemaker to cycle on. Press and hold the actuator paddle. CB yellow
"BC OPEN" LED should turn on and the icemaker should shut down according to the
chart below. If it does not, replace CB.
Cycle at Bin
Shutdown
Control Activation
Fill Cycle
15 sec. after activation.
Harvest Cycle
At the end of the harvest cycle, or up to 15 sec. into the freeze cycle if activated at the
end of the harvest cycle.
Freeze Cycle
15 sec. after activation if activated at least 15 sec. before the 5-min. short cycle
protection timer terminates. Otherwise, at the end of the next harvest cycle.
Legend: BC–bin control; CB–control board
26
2. Bin Control Cleaning
Scale may build up on BC. Scale can cause the actuator paddle and magnet to stick.
In this case, BC should be cleaned.
WARNING
CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are
securely in place after the icemaker is serviced. Make sure that none have fallen
into the dispense unit/ice storage bin.
1) Turn off the power supply.
2) Remove the front panel, then move the control switch to the "OFF" position.
3) Remove the base cover and clear any ice away from BC.
4) Disconnect BC connector from CB K4 connector, then remove BC from the icemaker.
5) Remove the actuator paddle from the switch mount. See Fig. 2.
6) Wipe down BC with a mixture of 1 part of Hoshizaki "Scale Away" and 25 parts of warm
water. Rinse the parts thoroughly with clean water.
7) Reassemble BC and replace it in its correct position.
Note: If the magnet was removed for cleaning, be sure to replace it in its correct
position.
8) Reconnect BC connector to CB K4 connector, then move the control switch to the "ICE"
position.
9) Replace the control box cover and base cover in their correct positions.
10) Turn on the power supply to start the automatic icemaking process.
11) Replace the front panel in its correct position.
Legend: BC–bin control
BC Bracket
Switch Mount
Actuator
Paddle
Bin Control Proximity
Switch Closed
(calling for ice)
Bin Control
Proximity Switch
Open (bin full,
icemaker off or
shutting down)
Fig. 2
27
Magnet
F. Float Switch Check and Cleaning
FS is used to determine that there is sufficient water in the water tank after the 1‑min.
fill cycle and after each harvest cycle. FS is also used to determine that the appropriate
volume of water has been converted into ice before switching out of the freeze cycle.
No adjustment is required.
1. Float Switch Check
To check FS, follow the steps below.
1) Turn off the power supply.
2) Remove the front panel, then move the
control switch to the "OFF" position.
Disconnect This
End of Pump
Tubing to Drain
Water Tank
3) Drain the water tank. Remove the base
cover, then disconnect one end of the
pump tubing to drain the water tank.
See Fig. 3. After the water tank has drained, Base Cover
reconnect the pump tubing.
Fig. 3
4) Remove the control box cover.
5) Disconnect FS connector from CB K5 connector.
6) Check for continuity across FS leads. With the water tank empty, FS should be open.
If open, continue to step 7. If closed, follow the steps in "II.E.2. Float Switch Cleaning."
After cleaning FS, check it again. Replace if necessary.
7) Reconnect FS connector to CB K5 connector, then replace the control box cover in its
correct position.
8) Move the control switch to the "ICE" position. Replace the front panel in its correct
position, then turn on the power supply. After 1 min., the 1-min. fill cycle should end and
the initial harvest cycle should begin. If the initial harvest cycle begins, FS is good and
the check is complete. If the initial harvest cycle does not begin, continue to step 9.
9) Turn off the power supply.
10) Remove the front panel. Move the control switch to the "OFF" position.
11) Remove the control box cover.
12) Disconnect FS connector from CB K5 connector.
13) Check for continuity across FS leads. With the water tank full, FS should be closed.
If FS is closed and the icemaker will not switch from the 1-min. fill cycle to the initial
harvest cycle, replace CB. If FS is open, confirm that the water tank is full. If the water
tank is not full, check the water supply, water filters, and inlet water valve. If the water
tank is full, follow the steps in "II.F.2. Float Switch Cleaning." After cleaning FS, check it
again. Replace if necessary.
Legend: CB–control board; FS–float switch
28
2. Float Switch Cleaning
Depending on local water conditions, scale may build up on FS. Scale on the switch can
cause the float to stick. In this case, FS should be cleaned.
1) Turn off the power supply.
2) Remove the front panel, then move the control switch to the "OFF" position.
3) Drain the water tank. Remove the base cover, then disconnect one end of the pump
tubing to drain the water tank. See Fig. 3. After the water tank has drained, reconnect
the pump tubing.
4) Disconnect the vent tube and the flush tube from the top of FS, then remove FS
assembly and remove the rubber boot from the bottom of FS assembly. See Fig. 4.
5) Remove the retainer rod from the bottom of FS housing, then remove the float. Be
careful not to bend the retainer rod excessively when removing it.
6) Wipe down FS housing, shaft, float, and retainer rod with a mixture of 1 part Hoshizaki
"Scale Away" and 25 parts warm water. Clean the inside of the rubber boot and hose
with cleaning solution. Rinse the parts thoroughly with clean water.
7) Reassemble FS assembly and replace it and the rubber boot in their correct positions.
Reconnect the vent tube and the flush tube.
8) Move the control switch to the "ICE" position.
9) Replace the base cover (if applicable) and front panel in their correct positions.
10) Turn on the power supply to start the automatic icemaking process.
Legend: CB–control board; FS–float switch
Vent
Flush
Shaft
Float Switch
Housing
Float
Retainer Rod
Rubber Boot
and Hose
Fig. 4
29
G. Thermistor Check
To check thermistor resistance, follow the steps below.
1) Turn off the power supply.
2) Remove the front panel. Move the control switch to the "OFF" position.
3) Remove the control box cover.
4) Remove the thermistor from the refrigerant tubing.
5) Immerse the thermistor sensor portion in a glass containing ice and water for 2 or 3 min.
6) Disconnect the thermistor connector from CB K3 connector and check the resistance
between thermistor leads. Normal range is 4.7 to 6.2 kΩ. If outside the normal range,
replace the thermistor. See "IV.B. Component Service Information." If within the normal
range, continue to the next step.
7) Replace the thermistor in its correct position. See "IV.B. Component Service
Information."
8) Reconnect the thermistor connector to CB K3 connector.
9) Replace the control box cover in its correct position.
10) Move the control switch to the "ICE" position.
11) Replace the front panel in its correct position.
12) Turn on the power supply.
13) Once the harvest cycle starts (Comp energizes), begin timing the harvest cycle.
14) The harvest timer and harvest cycle should terminate within 2 to 5 min. If the harvest
cycle does not terminate within 2 to 5 min., replace CB.
Legend: CB–control board; Comp–compressor
H. Control Switch
The control switch has three positions: "OFF" for power off, "ICE" for icemaking, and
"WASH" to energize the pump motor when cleaning and sanitizing.
30
I. Diagnostic Tables
1. No Ice Production
No Ice Production - Possible Cause
1. Power Supply
a) Off, blown fuse, or tripped breaker.
b) Not within specifications.
2. Fuse (Control Box)
a) Blown.
3. Thermostatic Bin Control
See "II.E. Bin Control Check"
a) Tripped with bin filled with ice.
b) Ambient temperature too cool.
c) Set too warm.
d) Bulb out of position.
e) Open contacts, defective.
4. Control Switch
a) In "OFF" or "WASH" position.
b) Bad contacts.
5. High-Pressure Switch
a) Dirty condenser.
b) Fan motor not operating.
c) Refrigerant overcharged.
d) Bad contacts.
e) Refrigerant lines or components plugged.
6. Control Transformer
(115VAC/10.5VAC)
a) Coil winding open or shorted.
7. Control Board
See "II.D. Control Board Check"
a) In alarm.
b) CB yellow "BC OPEN" LED on (bin full).
c) Defective.
8. Bin Control
See "II.E. Bin Control Check"
a) Tripped with bin filled with ice.
9. Water Supply
a) Water supply off or improper water pressure.
b) Actuator does not move freely.
c) Defective.
b) External water filters clogged.
10. Inlet Water Valve
a) Screen or orifice clogged.
b) Coil winding open.
c) Water valve open in freeze cycle.
11. Float Switch
a) Float does not move freely.
See "II.F. Float Switch Check and b) Defective.
Cleaning"
12. Compressor
a) Compressor relay/magnetic contactor contacts bad or coil winding
open.
b) Start capacitor or run capacitor defective (single phase).
c) Internal protector open.
d) Start relay contacts bad or coil winding open (single phase).
e) Compressor defective.
13. Hot Gas Valve
a) Closed in harvest cycle.
b) Open in freeze cycle.
14. Thermistor
See "II.G. Thermistor Check"
a) Loose, disconnected, or defective.
31
No Ice Production - Possible Cause
15. Pump Motor
a) Motor winding open.
b) Bearing worn out or locked rotor.
c) Defective capacitor.
d) Mechanical seal worn out.
16. Thermostatic Expansion Valve
a) Bulb loose.
17. Liquid Line Valve
a) Closed in freeze cycle.
b) Operating erratically.
b) Open in harvest cycle.
18. Fan Motor
a) Motor winding open.
b) Bearing worn out or locked rotor.
c) Defective capacitor.
19. Water System
a) Water leaks causing short freeze time.
2. Freeze-Up
Defrost and clean the icemaker prior to diagnosing freeze-up. Fill out a freeze-up checklist.
See "II.J. Freeze Up Check List," the Hoshizaki America Technician's Pocket Guide, or
contact your local distributor for a copy of the freeze-up checklist.
Freeze-Up - Possible Cause
Harvest Cycle
1. Evaporator
a) Scaled up.
b) Damaged.
2. Cube Guides
a) Out of position.
b) Damaged.
3. Spray Tubes and/or Spray
Guides
a) Dirty.
4. Water Supply
a) Low water pressure.
b) Out of position.
b) External water filters clogged.
c) Insufficient water line size.
Minimum 1/4" Nominal ID (6 mm Nominal OD in the EU) copper
water tubing or equivalent.
5. Inlet Water Valve
a) Screen or orifice clogged.
b) Defective.
6. Float Switch
a) Dirty, sticking.
See "II.F. Float Switch Check and b) Defective.
Cleaning"
7. Refrigerant Charge
a) Low.
8. Control Board
See "III.C. Settings and
Adjustments" and "II.D. Control
Board Check"
a) Harvest timer (S4 dip switch 1 & 2) set too short.
b) Harvest pump timer (S4 dip switch 7) not in factory default position.
c) Defective.
9. Bin Control
See "II.E. Bin Control Check"
a) Actuator does not move freely.
32
Freeze-Up - Possible Cause
10. Thermistor
See "II.G. Thermistor Check"
a) Loose, disconnected, or defective.
11. Thermostatic Expansion Valve
a) Defective.
12. Hot Gas Valve
a) Closed or restricted.
13. Liquid Line Valve
a) Open.
Freeze Cycle
1. Evaporator
a) Scaled up.
2. Spray Tubes and/or Spray
Guides
a) Dirty.
3. Refrigerant Charge
a) Low.
4. Control Board
See "II.D. Control Board Check"
a) Freeze timer (S4 dip switch 9 & 10) set incorrectly.
5. Inlet Water Valve
a) Leaking by.
b) Damaged.
b) Out of position.
b) Defective.
6. Float Switch
a) Float does not move freely.
See "II.F. Float Switch Check and b) Defective.
Cleaning"
7. Pump Motor
a) RPM too slow.
b) Impeller damaged.
8. Thermostatic Expansion Valve
a) Bulb loose or defective.
9. Liquid Line Valve
a) Restricted.
10. Headmaster (C.P.R.)
(remote models)
a) Not bypassing.
3. Low Ice Production
Low Ice Production - Possible Cause
Long Harvest Cycle
1. Evaporator
a) Scaled up.
2. Spray Tubes and/or Spray
Guides
a) Dirty.
3. Refrigerant Charge
a) Low.
4. Water Supply
a) Low water pressure.
b) Out of position.
b) External water filters clogged.
c) Insufficient water line size.
Minimum 1/4" Nominal ID (6 mm Nominal OD in the EU) water
tubing or equivalent.
d) Too cold.
5. Control Board
See "II.D. Control Board Check"
a) Thermistor connection loose (K3).
6. Thermistor
See "II.G. Thermistor Check"
a) Loose, disconnected, or defective.
7. Hot Gas Valve
a) Erratic or closed.
8. Inlet Water Valve
a) Screen or orifice clogged.
b) Defective.
33
Low Ice Production - Possible Cause
9. Compressor
a) Inefficient or off.
10. Liquid Line Valve
a) Erratic or open.
11. Thermostatic Expansion Valve
a) Defective.
Long Freeze Cycle
1. Evaporator
a) Scaled up, dirty.
a) Scaled up, dirty.
2. Float Switch
See "II.F. Float Switch Check and b) Float sticking.
Cleaning"
c) Defective switch.
3. Inlet Water Valve
a) Leaking by.
4. Hot Gas Valve
a) Erratic or open.
5. Condenser
a) Clogged.
6. Control Board
See "II.D. Control Board Check"
a) Float switch connection loose (K5).
7. Refrigerant Charge
a) Low.
8. Thermostatic Expansion Valve
a) Bulb loose.
b) Defective.
b) Defective.
9. Compressor
a) Inefficient or off.
10. Pump Motor
a) RPM too slow.
11. Liquid Line Valve
a) Erratic or restricted.
12. Headmaster (C.P.R.)
(remote models)
a) Not bypassing.
13. Splash Guard
a) Out of place.
b) Missing or damaged.
Freeze-Time Correction Cycle Initiated
1. Evaporator
a) Scaled up, dirty.
2. Float Switch
a) Scaled up, dirty.
See "II.F. Float Switch Check and b) Float sticking.
Cleaning"
c) Defective switch.
3. Refrigerant Charge
a) Low.
4. Splash Guard
a) Out of place.
5. Distribution/Spray Tubes
a) Scaled up, dirty.
6. Cube Guides
a) Out of position.
b) Missing or damaged.
b) Damaged.
7. See "2. Freeze Up" Above
34
J. Freeze-Up Check List
Freeze-Up Check List
Please Complete When Diagnosing a Freeze-Up, Refrigerant Leak, or Low Charge
Technical Support Fax #: 770-487-3360
Make Copies And Use As Needed
Model #___________________________ Serial # _________________________Install Date______________Fail Date___________
List model and manufacture of bin or dispenser__________________________.
Date appliance was last cleaned:__________.
Appliance Sequence of Operation
Fill
YES NO
[ ]
[ ] 18) Does the water tank fill and overflow?
60-90 sec. Note: Larger models may take up to
120 seconds to overflow when empty.
[ ]
[ ] 19) If NO in step 17, is water flow 5GPM for larger?
Freeze-Up Defrost
YES NO
[ ]
[ ]
1) After defrosting, was the appliance leak
checked?
[ ]
[ ]
2) Were any leaks found?
If so where?_____________________.
[ ]
[ ]
3) Was any refrigerant added to the unit?
If so, how much?_________________.
Set Up
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
4) Is the appliance stand alone?
5) Is water line independent?
6) Is water line correct size? If not________”.
3/8" Nominal ID Copper Water Tubing or
Equivalent.
7) What is water pressure?___________.
Water Temperature_________.
8) Does appliance have any water filtration?
If yes please list the following:
Filter brand___________________.
Model________________.
Filter pressure gauge reading during the fill
cycle___________.
Date filter was last
replaced?__________________________.
GPM or LPM flow rate of filter
system?__________________.
9) Ambient temperature at appliance?
______________.
At remote condenser (if applicable)?________.
Appliance Status
[ ]
[ ] 10) Is the appliance and/or float switch dirty?
11) List the S4 (1-10) and S5 (1-5) DIP switch
settings.
S4: 1___2___3___4___5___6___7___8___9___10____
S5: 1_____2_____3_____4_____5______
[ ]
[ ] 12) Is DIP switch number 7 ON (harvest pump
time (harvest assist) all models and freeze-time
correction models with control board
2A7664-02?
[ ]
[ ] 13) Is the cube guide positioned correctly?
[ ]
[ ] 14) Are the evaporator separators positioned
properly?
[ ]
[ ] 15) Is the thermistor properly mounted, tight, and
insulated?
[ ]
[ ] 16) Is the TXV bulb properly mounted, tight, and
insulated?
[ ] [ ]
17) Are splash guards in place?
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
Harvest
20) Is the hot gas valve opening?
21) Is harvest pump time (harvest assist) utilized
(S4dip switch 7)?
22) Is hot gas valve opening in harvest?
23) Does water valve close completely when
deenergized?
24) What was length of harvest?___________.
Freeze
25) Is pump motor energized in freeze cycle except
during 10-sec. anti-slush. If activated (S5 dip
switch 5 on)?
26) Water-cooled condenser outlet temperature
5-min. into freeze? ______________°F.
27) What was length of freeze?____________.
28) Is the cube size consistent from inlet to outlet of
evaporator?
29) Is ice still dropping when next freeze cycle starts?
30) What is the ice drop weight?___________.
31) What is head pressure?
Freeze_________Harvest_______.
(Freeze pressure should be taken 5 minutes into
the cycle).
32) What is suction pressure?
Freeze______Harvest_______.
(Freeze pressure should be taken 5 minutes into
the cycle).
33) When activating bin control, did appliance
shutdown within 15 seconds in the first 5 minutes
of freeze cycle?
Note: Make copies of this form and use it when diagnosing a freeze up condition. Submit a completed copy of the checklist
along with the freeze-up labor claim form.
1
35
III. Controls and Adjustments
• A Hoshizaki exclusive control board is employed in KM series appliances.
• All models are pretested and factory adjusted.
• For a control board check procedure, see "II.C. Control Board Check."
NOTICE
• Fragile, handle very carefully.
• The control board contains integrated circuits, which are susceptible to failure
due to static discharge. It is especially important to touch the metal part of the
icemaker when handling or replacing the control board.
• Do not touch the electronic devices on the control board or the back of the control
board.
• Do not change wiring and connections. Do not misconnect K3 WHITE, K4 RED,
and K5 BLACK, because the same connector is used for the thermistor, bin
control, and float switch.
• Do not short out power supply to test for voltage.
• Always replace the whole control board assembly if it goes bad.
36
A. Control Board Layout
1. "J" Control Board
"J" Control Board
• Bin Control Switch
Closed LED (green)
• "ALARM RESET" Button
• S4 Dip Switch
• "OUTPUT TEST" Button
(used to test relays on control board)
• K3 (white) Connector
Thermistor
(harvest control and
high temperature safety)
• Bin Control Switch
Open LED (yellow)
• Alarm Buzzer
• K4 (red) Connector
Bin Control
• S5 Dip Switch
• Ext. Harvest LED
(yellow) (lights
when water line
thermistor initiates
extended harvest)
Not used this model
• K5 (black) Connector
Float Switch
(water level)
• POWER OK LED
(red) (lights when
10.5VAC is supplied
to K2 connector)
• Part Number
• K1 Connector
Pins #1 through #10
#1, 9 Compressor Relay
#2 Hot Gas Valve, X12 Relay
#3 Fan Motor
Liquid Line Valve
#4 Pump Motor (icemaking)
#5 Pump Motor
(harvest pump timer and
pump-out)
#6 Inlet Water Valve, X11 Relay
#7, 10 Component Power Supply
#8 Open
• Relay LEDs
(4) (indicate which
relays are energized
and which K1
connector pins are
energized
• LED 2 (X2 Relay)
LED 2 on:
K1 Connector Pin #2
LED 2 off:
K1 Connector Pin #3
• LED 3 (X3 Relay)
LED 3 on:
K1 Connector Pin #5
LED 3 off:
K1 Connector Pin #4
(energized in freeze)
• LED 4 (X4 Relay)
K1 Connector Pin #6
• LED 1 (X1 Relay)
K1 Connector Pin #1, #9
• K2 Connector
Control Transformer (10.5VAC)
• Note: 2A7664-01 Does not have Freeze-Time Correction program.
"J" Control Board
Part Number 2A7664-02
37
B. LED Lights and Audible Alarm Safeties
Beep occurs and red CB "POWER OK" LED turns on when control switch is moved to
"ICE" position.
Sequence
Green LEDs 1 through 4 turn on and sequence from initial startup as listed in the
table below. Order of green LEDs from the outer edge of control board is 1, 4, 3, 2.
Sequence Step
LED
Energized
Components
Time LEDs are On
Min.
Max.
1-Minute Fill Cycle
Harvest Cycle
Harvest Pump Time
(harvest assist)
Freeze Cycle
4
1, 4, 2
1, 3, 2
WV
Comp, FM*, FMR, HGV, WV
Comp, FM*, FMR, HGV, PM
1 minute 20 minutes
0 seconds 50 seconds
1
Comp, FM/FMR, PM, LLV
5 minutes
Anti-Slush Control
1, 3
Comp, FM/FMR, LLV
Pump-Out Cycle
1, 4†, 3, 2 Comp, FM*, FMR, HGV, PM, WV †, DV
*FM energized if on K1 Conector Pin #9; †pump-out timer setting
freeze timer
setting
If S5 dip switch 5 on,
PM off 10 sec. when
thermistor at 36°F (2.2°C)
10 seconds 20 seconds
Alarms
Type
1
Beep
2
Beep
Alarm
Notes
High Evaporator Temp.
Check for harvest problem (stuck HGV or relay), hot wa(temperature > 127°F) (53°C) ter entering unit, stuck HM, or shorted thermistor.
Harvest Backup Timer
Check thermistor (open), HGV not opening, TXV or LLV
(harvest > 20 min. for two
leaking by, low charge, inefficient Comp, or WRV leaking
cycles in a row)
by.
3
Freeze Timer
Check FS stuck closed (up), WV leaking by, HGV leaking
Beep
(freeze > freeze timer setting by, PM not pumping, TXV defective, LLV not opening, low
for two cycles in a row)
charge, HM not bypassing, or inefficient Comp.
CB red "POWER OK" LED blinks.
LED Blink
Freeze-Time
Correction (2A7664-02)
3rd freeze‑time correction cycle in 36 hours starts
(maximum freeze time
CB yellow "EXT HARVEST" LED blinking.
differential exceeded)
Fill out freeze-up checklist.
To reset above safeties, press "ALARM RESET" button with power supply on.
6
Low Voltage
Red LED turns off if voltage protection operates.
(92Vac±5% or less)
Control voltage safeties automatically reset when voltage
is corrected.
7
High Voltage
(147Vac±5% or more)
Legend: Comp–compressor; FM–fan motor; FMR–fan motor remote; FS–float switch;
HGV–hot gas valve; HM–headmaster (C.P.R.); LLV–liquid line valve; PM–pump
motor; TXV–thermostatic expansion valve; WRV–water regulating valve;
WV–inlet water valve
38
C. Settings and Adjustments
NOTICE
Dip switches are factory set. Failure to maintain factory settings may adversely
affect performance and warranty coverage. For more information, contact your
Hoshizaki Service Center.
1. Default Dip Switch Settings
The dip switches are factory-adjusted to the following positionsfor both the
2A7664-01and 2A7664-02 control boards:
S4 Dip Switch No.
1
KM-340MAJ, KM-340MWJ
2
3
4
5
6
7
8
9
10
OFF OFF ON OFF ON OFF ON OFF OFF OFF
KM-515MAJ, KM-515MWJ, KM-515MRJ
ON OFF OFF OFF OFF OFF ON OFF OFF OFF
KM-650MAJ, KM-650MWJ, KM-650MRJ
OFF OFF OFF OFF OFF OFF ON OFF OFF OFF
S5 Dip Switch (Do Not Adjust)
"J" Control Board
2
3
4
5
OFF OFF OFF OFF ON
S4 Dip Switch
"J" Control Board
Freeze Timer (9 & 10)
Factory Use (8)
Harvest Pump Time (Harvest Assist)/Freeze-Time Correction (7)
(Do Not Adjust)
Harvest Pump Time (Harvest Assist) (6)
(Do Not Adjust)
Pump-Out Frequency Control (5)
Pump-Out Time/Harvest Time During Pump-Out (3 & 4)
Harvest Time (1 & 2)
1 2 3 4 5
S5 Dip Switch (Do Not Adjust)
"J" Control Board
ON
1 2 3 4 5 6 7 8 9 10
All Models
1
ON
Dip Switch No.
39
Anti-Slush (5)
Minimum Harvest Time (4)
Refill Counter (2 and 3)
Float Switch Selector (1)
2. Harvest Time (S4 dip switch 1 & 2)
The harvest timer starts counting when the thermistor reaches 48°F (9°C) at the
evaporator outlet and the control board reads 3.9 kΩ from the thermistor. The harvest
timer is factory set, and generally no adjustment is required. However, a setting longer
than the factory setting may be advised in cases where the drain provided at harvest
needs to be prolonged for extra cleaning. Note that the pump-out timer (S4 dip switch
3 & 4) acts in place of the harvest timer during cycles with a pump out. For details, see
"III.C.3. Pump-Out Timer (S4 dip switch 3 & 4)."
Note: On models with a pump-out every cycle, the harvest timer is only relevant during
the initial harvest cycle since a pump out occurs every cycle thereafter.
Time
(sec.)
S4 Dip Switch Setting
No. 1
No. 2
S5-4 OFF
S5-4 ON
OFF
OFF
60
30
ON
OFF
90
45
OFF
ON
120
60
ON
ON
180
75
3. Pump-Out Time/Harvest Time During Pump-Out (S4 dip switch 3 & 4)
NOTICE
Do not adjust 3 off and 4 on. Pump motor does not run in pump-out rotation in this
setting.
When a pump-out is called for, the pump motor stops for 2 sec., then energizes in the
reverse direction, taking water from the bottom of the water tank 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 float
switch. The pump motor drains the water tank for the time determined by the pump-out
timer. The pump‑out timer also acts in place of the harvest timer during cycles with a
pump‑out. The pump-out timer is factory set, and generally no adjustment is required.
However, where water quality is bad and the icemaker needs a longer pump-out time,
the pump‑out timer can be adjusted. The pump‑out time can be set to pump-out for 10 or
20 sec. During pump-out cycles minimum harvest time is based on times given in the
table below.
S4 Dip Switch Setting
Time (sec.)
T1
No. 3
No. 4
OFF
OFF
ON
Inlet Water
Valve
T2
S5-4 OFF
S5-4 ON
S5-4 OFF
S5-4 ON
10
150
100
Closed
Closed
OFF
10
180
130
Closed
Closed
OFF
ON
10
120
70
Open
Closed
ON
ON
20
180
180
Closed
Closed
T1: Time to drain the water tank
T2: Harvest timer at pump out
40
4. Pump-Out Frequency Control (S4 dip switch 5)
The pump-out frequency control is factory set to drain the water tank every 10 cycles.
Generally no adjustment is required. However, where water quality is bad and the
icemaker needs a pump-out more often, the pump‑out frequency can be adjusted. The
pump-out frequency control can be set to have a pump‑out occur every cycle, or every
10 cycles.
The first pump-out is dependent on S4 dip switch 5. See the table below.
S4 Dip Switch Setting
Pump-Out Frequency
1st Pump-Out
OFF
Every 10 cycles
After 11th freeze cycle
ON
Every cycle
After 2nd freeze cycle
No. 5
5. Harvest Pump Time (Harvest Assist) (S4 dip switch 6)
NOTICE
Factory set for proper operation. Do not adjust. Adjustment outside of the factory
default setting may result in damage to the appliance.
Harvest pump time (harvest assist) is only active when S4 dip switch 7 is in the "ON"
position. In the factory default position, the harvest pump time (harvest assist) starts with
50 sec. left to go in harvest cycle (S4 dip switche 6) and after the thermistor reaches 48°F
(9°C) at the evaporator outlet and the control board reads 3.9 kΩ from the thermistor. The
harvest pump time (harvest assist) is factory set, and no adjustment is required.
Harvest Pump Time
(Harvest Assist)
S4 Dip Switch Setting
No. 6
S5-4 OFF
S5-4 ON
OFF
50 sec.
25 sec.
ON
25 sec.
15 sec.
41
6. Harvest Pump Time (Harvest Assist)/Freeze-Time Correction (S4 dip switch 7)
NOTICE
Factory set for proper operation. Do not adjust. Adjustment outside of the factory
default setting may result in damage to the appliance.
a) Harvest Pump Time (Harvest Assist)
Depending on S4 dip switch 7 setting, the pump motor either stays off or is energized
during the last seconds of the harvest cycle. When the pump motor is energized (S4 dip
switch 7 on), water circulates over the evaporator. The harvest water valve is open during
harvest for a maximum of 6 minutes or the length of harvest minus the harvest pump
time value(S4 dip switch 6), whichever is shorter.
When S4 dip switch 7 is in the on position and harvest begins, X11 and X10 relays
energize. A latching circuit is created through the X11 and X10 relays. For further
details, see "VIII.B. Wiring Diagrams." In the factory default position, 50 sec. before
harvest termination, LED 4 turns off, inlet water valve and X11 relay de‑energize. X10
relay remains energized through the latching circuit. Next, LED 3 turns on and control
board K1 connector pin #5 (DBU wire) energizes, energizing the pump motor for the
last seconds of harvest. Harvest pump time adjusted by S4 dip switch 1 & 2 and S5 dip
switch 4 settings. Contact Technical Support before adjusted these settings.
b) Freeze-Time Correction
When S4 dip switch 7 is in the on position, freeze-time correction enabled.
See "II.C. Freeze-Time Correction Cycle (90 min.)."
S4 Dip Switch Setting
Harvest Pump
Time (sec.)
(Harvest Assist)
Freeze-Time
Correction
OFF
0
Disabled
ON
50
Enabled
No. 7
7. Factory Use (S4 dip switch 8)
Factory set for proper operation. Do not adjust. This must be left in the factory default
position.
42
8. Freeze Timer (S4 dip switch 9 & 10)
NOTICE
Adjust to proper specification, or the icemaker may not operate correctly.
The freeze timer setting determines the maximum allowed freeze time to prevent
possible freeze-up issues. Upon termination of the freeze timer, the control board initiates
the harvest cycle or pump-out cycle. After 2 consecutive freeze timer terminations, the
control board shuts down the icemaker. In this case, see "II.G.3. Low Ice Production"
for possible solutions. The freeze timer is factory set and no adjustment is required.
Before changing this setting, contact Hoshizaki Technical Support at 1‑800‑233-1940 for
recommendations.
S4 Dip Switch Setting
No. 9
No. 10
Time
(min.)
OFF
OFF
60
OFF
ON
50
ON
OFF
70
ON
ON
75
9. Float Switch Selector (S5 dip switch 1)
This dip switch setting allows use of this control board in single and dual float switch
models. This model uses a single float switch style.
NOTICE
Do not adjust. This must be left in the factory default position or the icemaker will
not operate correctly.
S5 Dip Switch Setting
No. 1
Top or Bottom Float Switch
Control
OFF
Bottom Float Switch Enabled
ON
Top Float Switch Enabled
10. Refill Counter (S5 dip switch 2 and 3)
NOTICE
Do not adjust. These must be left in the factory default position or the icemaker will
not operate correctly.
S5 Dip Switch Setting
No. 2
No. 3
Refill
Counter
OFF
OFF
0
OFF
ON
1 refill
ON
OFF
9 refills
ON
ON
10 refills
43
11. Minimum Harvest Time (S5 dip switch 4)
NOTICE
Factory set for proper operation. Do not adjust. Adjustment outside the factory
default setting may result in damage to the appliance.
S5 Dip Switch Setting
No. 4
Minimum
Harvest Timer
OFF
120 sec.
ON
70 sec.
12. Anti-Slush (S5 dip switch 5)
This dip switch setting provides anti-slush control during the freeze cycle. When the
evaporator temperature reaches 36°F (2.2°C) the control board reads a 5.8kΩ signal
from the thermistor and de-energizes the water pump for 10 sec. to melt the ice slush
and prevent the ice slush from blocking the water supply tubing, causing irregular freeze
patterns.
NOTICE
Factory set for proper operation. Do not adjust. Adjustment outside the factory
default setting may result in damage to the appliance.
S5 Dip Switch Setting
No. 5
Anti-Slush
OFF
Disabled
ON
Enabled
44
IV. Refrigeration Circuit and Component Service Information
WARNING
• This appliance should be diagnosed and repaired only by qualified service
personnel to reduce the risk of death, electric shock, serious injury, or fire.
• Move the control switch to the "OFF" position and turn off the power supply. Place
the disconnect in the "OFF" position. Lockout/Tagout to prevent the power supply
from being turned back on inadvertently.
• CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are
securely in place after the icemaker is serviced. Make sure that none have fallen
into the dispenser unit/ice storage bin.
• Make sure all food zones in the icemaker and dispenser unit/ice storage bin are
clean after service.
A. Refrigeration Circuit Service Information
WARNING
• Repairs requiring the refrigeration circuit to be opened must be performed by
properly trained and EPA-certified service personnel.
• Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of
refrigerant to the system (if using an electronic leak detector), and then raise the
pressure using nitrogen gas (140 PSIG). Do not use R‑404A as a mixture with
pressurized air for leak testing.
NOTICE
• Always recover the refrigerant and store it in an approved container. Do not
discharge the refrigerant into the atmosphere.
• Do not leave the system open for longer than 15 min. when replacing or servicing
parts. The Polyol Ester (POE) oils used in R-404A applications can absorb
moisture quickly. Therefore it is important to prevent moisture from entering the
system when replacing or servicing parts.
• Always install a new drier every time the sealed refrigeration system is opened.
Do not replace the drier until after all other repair or replacement has been made.
Install the new drier with the arrow on the drier in the direction of the refrigerant
flow.
• When brazing, protect the drier by using a wet cloth to prevent the drier from
overheating. Do not allow the drier to exceed 250°F (121°C).
1. Refrigerant Recovery
The icemaker is provided with refrigerant access valves. Using proper refrigerant practices,
recover the refrigerant. Store the refrigerant in an approved container. Do not discharge the
refrigerant into the atmosphere.
45
2. Brazing
WARNING
• R-404A itself is not flammable at atmospheric pressure and temperatures up to
176°F (80°C).
• R-404A itself is not explosive or poisonous. However, when exposed to high
temperatures (open flames), R-404A can be decomposed to form hydrofluoric
acid and carbonyl fluoride both of which are hazardous.
• Do not use silver alloy or copper alloy containing arsenic.
1) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.
Note: Because the pipes in the evaporator case are specially coated to resist corrosion,
it is important to make connections outside the evaporator case when possible.
If it is necessary to braze inside the evaporator case, use sandpaper to remove
the coating from the brazing connections before unbrazing the components.
NOTICE
• Always install a new drier every time the sealed refrigeration system is opened.
• Do not replace the drier until after all other repair or replacement has been made.
Install the new drier with the arrow on the drier in the direction of the refrigerant
flow.
• When brazing, protect the drier by using a wet cloth to prevent the drier from
overheating. Do not allow the drier to exceed 250°F (121°C).
2) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of
refrigerant to the system (if using an electronic leak detector), and then raise the
pressure using nitrogen gas (140 PSIG). Do not use R-404A as a mixture with
pressurized air for leak testing.
3. Evacuation and Recharge (R-404A)
1) Attach a vacuum pump to the system. Be sure to connect the charging hoses to both
high and low-side refrigerant access valves.
IMPORTANT
The vacuum level and vacuum pump may be the same as those for current
refrigerants. However, the rubber hose and gauge manifold to be used for
evacuation and refrigerant charge should be exclusively for POE oils.
2) Turn on the vacuum pump. Open the gauge manifold valves. Never allow the oil in the
vacuum pump to flow backwards.
3) Allow the vacuum pump to pull down to a 29.9" Hg vacuum. Evacuating period depends
on pump capacity.
4) Close the low-side valve and high-side valve on the gauge manifold.
46
5) Disconnect the gauge manifold hose from the vacuum pump and attach it to a
refrigerant service cylinder. Remember to loosen the connection and purge the air from
the hose. For the required refrigerant charge, see the rating label inside the icemaker.
Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets
ARI Standard 700 (latest edition) be used.
6) A liquid charge is required when charging an R-404A system (to prevent fractionation).
Place the service cylinder on the scales; if the service cylinder is not equipped with
a dip tube, invert the service cylinder, then place it on the scales. Open the high-side
valve on the gauge manifold.
7) Allow the system to charge with liquid until the proper charge weight is met.
8) If necessary, add any remaining charge to the system through the low-side.
NOTICE! To prevent compressor damage, use a throttling valve or liquid
dispensing device to add the remaining liquid charge through the low-side
refrigerant access valve with the icemaker running.
9) Close the high and low-side gauge manifold valves, then disconnect the gauge manifold
hoses.
10) Cap the refrigerant access valves to prevent a possible leak.
47
B. Component Service Information
NOTICE
When replacing a component listed below, see the notes to help ensure proper
operation.
Component
Compressor
Notes
1 phase: Install a new start capacitor, run capacitor, and start relay.
3 phase: Install a new magnetic contactor.
Thermostatic
• Attach the thermostatic expansion valve bulb to the suction line in the same location as
Expansion Valves the previous bulb.
• The bulb should be between the 10 and 2 o'clock positions on the tube.
• Secure the bulb with the clamp and holder, then insulate it.
Hot Gas Valves
Liquid Line
Valves
• Replace the strainer if applicable.
• Use copper tube of the same diameter and length when replacing valve lines.
Fan Motors
Install a new capacitor.
Pump Motor
Install a new capacitor.
Thermistor
• Attach the new thermistor to the suction line in the same location as the previous
thermistor.
• The thermistor should be at the 12 o'clock position on the tube.
• Smoothly fill the recessed area of the thermistor holder with high thermal conductive
type sealant. Hoshizaki America part number 4A0683-01 (Silicone Heat Sink Compound
10-8108 manufactured by GC Electronics), KE-4560 RTV (manufactured by ShinEtsu
Silicones), or equivalent are recommended.
• Secure the thermistor with the holder, then insulate it.
• Be very careful to prevent damage to the leads.
48
C. Water Regulating Valve Adjustment (water-cooled model)
The water regulating valve is factory set, and generally no adjustment is required. However,
when necessary, adjust the water regulator using the following procedure.
1) Prepare a thermometer to check the condenser drain temperature. Attach a pressure
gauge to the high-side line of the system.
2) 5 min. after a freeze cycle starts, confirm
that the thermometer reads 104°F to 115°F
(40°C to 46°C). If it does not, rotate the
adjustment screw by using a flat blade
screwdriver until the temperature is in the
proper range. See Fig. 5. Next, check that
the reference pressure is in the range
indicated in the Head Pressure table in the
Performance Data section. If it is not in the
proper range, verify the refrigerant charge.
Adjustment Screw
CW – Higher
CCW – Lower
Top View
3) Check that the condenser drain temperature is stable.
49
Fig. 5
V. Maintenance
The maintenance schedule below is a guideline. More frequent maintenance may be
required depending on water quality, the appliance's environment, and local sanitation
regulations
WARNING
• Only qualified service technicians should service the appliance.
• To reduce the risk of electric shock, do not touch the control switch or service
switch with damp hands
• Before servicing: Move the control switch to the "OFF" position and turn off the
power supply. Place the disconnect in the "OFF" position.
Lockout/Tagout to prevent the power supply from being turned back on
inadvertently.
• CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are
securely in place after any maintenance is done to the icemaker. Make sure that
none have fallen into the dispenser unit/ice storage bin.
Maintenance Schedule
Frequency Area
Task
Daily
Scoop
Bi-Weekly
Monthly
Clean the ice scoop using a neutral cleaner. Rinse thoroughly after
cleaning.
Inspect. Wash with warm water and neutral cleaner if dirty.
Check for proper pressure and change if necessary.
Air Filters
External Water
Filters
Icemaker Exterior Wipe down with a clean, soft cloth. Use a damp cloth containing a
neutral cleaner to wipe off oil or dirt build up. Clean any chlorine staining
(rust colored spots) using a non-abrasive cleanser.
Underside of
Wipe down with a clean cloth and warm water.
Icemaker and Top
Kits; Bin Door and
Snout
Icemaker and
Clean and sanitize per the cleaning and sanitizing instructions provided
Dispenser Unit/Ice in the instruction manual or maintenance label on the icemaker.
Storage Bin Liner
Water Supply Inlet Close the icemaker water supply line shut‑off valve and drain the water
system. Clean the water supply inlet screen.
Condenser
Inspect. Clean if necessary by using a brush or vacuum cleaner. More
frequent cleaning may be required depending on location.
Water Hoses
Inspect the water hoses and clean/replace if necessary.
Yearly
50
VI. Preparing the Appliance for Periods of Non-Use
NOTICE
• When storing the appliance for an extended time or in sub-freezing temperatures,
follow the instructions below to prevent damage.
• To prevent damage to the water pump, do not operate the appliance with the
control switch in the "WASH" position when the water tank is empty.
When the appliance is not used for two or three days under normal conditions, it is
sufficient to move the control switch to the "OFF" position. When storing the appliance for
an extended time or in sub-freezing temperatures, follow the instructions below.
1. Remove the water from the icemaker water line:
1) Turn off the power supply, then remove the front panel.
2) Close the icemaker water supply line shut-off valve and open the icemaker water supply
line drain valve.
3) Allow the line to drain by gravity.
4) Attach a compressed air or carbon dioxide supply to the icemaker water supply line
drain valve.
5) Make sure at least 3 min. have elapsed since you turned off the power supply. Make
sure the control switch is in the "ICE" position. Replace the front panel in its correct
position, then turn on the power supply.
6) Blow the icemaker water supply line out using the compressed air or carbon dioxide
supply.
7) Close the icemaker water supply line drain valve.
2. Remove the water from the water tank:
1) Turn off the power supply, then remove the front panel.
2) Move the control switch to the "OFF" position.
3) Drain the water tank. remove the base
cover, then disconnect one end of the
pump tubing to drain the water tank.
See Fig. 6. After the water tank has drained,
reconnect the pump tubing.
4) Replace the base cover (if applicable) and
front panel in their correct positions.
Disconnect This
End of Pump
Tubing to Drain
Water Tank
Base Cover
Fig. 6
5) Remove all ice from the dispensing unit/ice storage bin. Clean the storage bin liner
using a neutral cleaner. Rinse thoroughly after cleaning.
51
3. On water-cooled model, remove the water from the water-cooled condenser:
1) Make sure the power supply is off, then remove the front panel and right side panel.
2) Close the condenser water supply line shut-off valve. If connected to a closed loop
system, also close the condenser return line shut-off valve.
3) Open the condenser water supply line drain valve. If connected to a closed loop system,
also open the condenser return line drain valve.
4) Attach a compressed air or carbon dioxide supply to the condenser water supply line
drain valve.
5) Open the water regulating valve by using a screwdriver to pry up on the spring retainer
underneath the spring. While holding the valve open, blow out the condenser using the
compressed air or carbon dioxide supply until water stops coming out.
6) Close the drain valve(s).
7) Replace the right side panel and front panel in their correct positions.
52
VII. Disposal
The appliance contains refrigerant and must be disposed of in accordance with
applicable national, state, and local codes and regulations. Refrigerant must be
recovered by properly certified service personnel.
53
VIII. Technical Information
We reserve the right to make changes in specifications and design without prior notice.
A. Specification and Performance Data Sheets
Pressure data is recorded at 5 min. into freezing cycle. The data not in bold should be
used for reference only.
1. KM-340MAJ
Specification Sheet
AC SUPPLY VOLTAGE
AMPERAGE
MINIMUM CIRCUIT AMPACITY
MAXIMUM FUSE SIZE
ELECTRIC & WATER CONSUMPTION
ELECTRIC W (kWH/100 lbs.)
WATER gal./24HR (gal./100 lbs.)
ICE PRODUCTION PER CYCLE
BIN CONTROL SYSTEM
REFRIGERANT CHARGE
Performance Data Sheet
APPROXIMATE ICE PRODUCTION
PER 24 HR.
APPROXIMATE ELECTRIC
CONSUMPTION
watts
APPROXIMATE WATER
CONSUMPTION PER 24 HR.
gal./day m3/day
FREEZING CYCLE TIME
min.
HARVEST CYCLE TIME
min.
HEAD PRESSURE
PSIG kg/cm2G
SUCTION PRESSURE
PSIG
kg/cm2G
115/60/1
9.2 A
15 A
15 A
90/70°F
740 (5.65)
54 (17.1)
10.7 lbs. (4.9 kg) 480pcs.
Mechanical Switch
R404A, 1 lb. 4.8 oz. (590g)
AMBIENT TEMP.
(ºF/ºC)
70/21
80/27
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
404
384
105
94
90
73
220
236
241
241
62
64
64
64
70/50°F
700 (4.18)
105 (26.0)
50/10
700
709
712
713
34
36
37
38
4.1
3.9
3.9
3.6
TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR
183
174
0.40
0.35
0.34
0.27
15.5
16.6
16.9
16.9
4.4
4.5
4.5
4.5
WATER TEMP. (ºF/ºC)
70/21
378
171
344
156
712
727
740
742
90
0.34
70
0.27
54
0.20
53
0.20
37
41
44
45
3.9
3.5
3.3
3.3
241
16.9
268
18.8
290
20.4
294
20.6
64
4.5
67
4.7
69
4.9
69
4.9
348
317
82
68
49
44
259
280
306
320
66
68
71
72
90/32
723
736
750
760
41
45
48
52
3.8
3.6
3.3
3.3
158
144
0.31
0.26
0.19
0.17
18.2
19.7
21.5
22.5
4.6
4.8
5.0
5.1
7,500 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
900 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
54
2. KM-340MWJ
Specification Sheet
AC SUPPLY VOLTAGE
AMPERAGE
MINIMUM CIRCUIT AMPACITY
MAXIMUM FUSE SIZE
ELECTRIC & WATER CONSUMPTION
ELECTRIC W (kWH/100 lbs.)
WATER gal./24HR (gal./100 lbs.)
WATER COOLED CONDENSER
(gal./24HR (gal./100 lbs.)
ICE PRODUCTION PER CYCLE
BIN CONTROL SYSTEM
REFRIGERANT CHARGE
Performance Data Sheet
APPROXIMATE ICE PRODUCTION
PER 24 HR.
lbs./day kg./day
APPROXIMATE ELECTRIC
CONSUMPTION
watts
APPROXIMATE WATER
CONSUMPTION PER 24 HR.
gal./day m3/day
FREEZING CYCLE TIME
min.
HARVEST CYCLE TIME
min.
HEAD PRESSURE
PSIG kg/cm2G
SUCTION PRESSURE
PSIG
kg/cm2G
115/60/1
7.5 A
15 A
15 A
90/70°F
690 (4.84)
62 (18.1)
294 (86)
70/50°F
680 (4.06)
87 (21.6)
140 (35)
10.5 lbs. (4.8 kg) 480pcs.
Mechanical
R404A, 1 lb. 0.9 oz. (480g)
AMBIENT TEMP.
(ºF/ºC)
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
402
389
385
384
227
256
265
380
290
290
289
294
68
68
69
69
TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR
WATER FLOW FOR CONDENSER
PRESSURE DROP OF COOLING WATER LINE
50/10
680
682
683
684
34
36
36
36
3.7
3.6
3.6
3.5
182
176
175
174
0.86
0.97
1.00
1.44
20.4
20.4
20.3
20.7
4.8
4.8
4.8
4.8
WATER TEMP. (ºF/ºC)
70/21
385
175
363
164
344
156
340
154
683
687
690
691
265
1.00
315
1.19
356
1.35
412
1.56
36
38
40
40
3.6
3.4
3.3
3.3
289
20.3
289
20.3
288
20.2
291
20.4
69
4.8
69
4.9
70
4.9
70
4.9
368
349
329
315
453
579
593
810
298
302
299
310
70
70
71
72
90/32
688
692
695
700
37
39
41
42
3.6
3.5
3.3
3.3
167
158
149
143
1.72
2.19
2.24
3.07
20.9
21.2
21.1
21.8
4.9
5.0
5.0
5.1
7,500 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
900 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
32 gal./h [AT 100ºF (38ºC) / WT 90ºF (32ºC)]
less than 10 PSIG
ENG.F-011.1.0205
55
3. KM-515MAJ
Specification Sheet
AC SUPPLY VOLTAGE
AMPERAGE
MINIMUM CIRCUIT AMPACITY
MAXIMUM FUSE SIZE
ELECTRIC & WATER CONSUMPTION
ELECTRIC W (kWH/100 lbs.)
WATER gal./24HR (gal./100 lbs.)
ICE PRODUCTION PER CYCLE
BIN CONTROL SYSTEM
REFRIGERANT CHARGE
Performance Data Sheet
APPROXIMATE ICE PRODUCTION
PER 24 HR.
lbs./day kg./day
APPROXIMATE ELECTRIC
CONSUMPTION
watts
APPROXIMATE WATER
CONSUMPTION PER 24 HR.
gal./day m3/day
FREEZING CYCLE TIME
min.
HARVEST CYCLE TIME
min.
HEAD PRESSURE
2
PSIG kg/cm G
SUCTION PRESSURE
PSIG
kg/cm2G
115/60/1
10.8 A
20 A
20 A
90/70°F
990 (5.30)
72 (16.0)
10.4 lbs. (4.7 kg) 480pcs.
Mechanical Switch
R404A, 1 lb. 7.6 oz. (670g)
AMBIENT TEMP.
(ºF/ºC)
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
517
502
497
490
161
141
135
106
233
248
252
255
55
56
56
57
70/50°F
900 (4.20)
161 (31.2)
50/10
900
920
926
923
31
31
31
31
3.4
3.1
3.0
2.6
TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR
235
228
226
222
0.61
0.54
0.51
0.40
16.4
17.4
17.7
18.0
3.9
3.9
3.9
4.0
WATER TEMP. (ºF/ºC)
70/21
497
226
472
214
450
204
443
201
926
961
990
992
135
0.51
101
0.38
72
0.27
71
0.27
31
31
31
31
3.0
2.5
2.1
2.1
252
17.7
277
19.5
298
21.0
303
21.3
56
3.9
57
4.0
58
4.1
59
4.1
468
440
419
390
123
102
67
62
275
298
320
340
58
60
61
63
90/32
943
966
1000
1010
31
32
32
33
2.9
2.6
2.1
2.1
212
200
190
177
0.47
0.38
0.25
0.24
19.3
20.9
22.5
23.9
4.1
4.2
4.3
4.4
7,000 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
1,100 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
ENG.F-011.1.0205
56
4. KM-515MWJ
Specification Sheet
AC SUPPLY VOLTAGE
AMPERAGE
MINIMUM CIRCUIT AMPACITY
MAXIMUM FUSE SIZE
ELECTRIC & WATER CONSUMPTION
ELECTRIC W (kWH/100 lbs.)
WATER gal./24HR (gal./100 lbs.)
WATER COOLED CONDENSER
gal./24HR (gal./100 lbs.)
ICE PRODUCTION PER CYCLE
BIN CONTROL SYSTEM
REFRIGERANT CHARGE
Performance Data Sheet
APPROXIMATE ICE PRODUCTION
PER 24 HR.
lbs./day kg./day
APPROXIMATE ELECTRIC
CONSUMPTION
watts
APPROXIMATE WATER
CONSUMPTION PER 24 HR.
gal./day m3/day
FREEZING CYCLE TIME
min.
HARVEST CYCLE TIME
min.
HEAD PRESSURE
2
PSIG kg/cm G
SUCTION PRESSURE
PSIG
kg/cm2G
115/60/1
9.1 A
20 A
20 A
90/70°F
860 (4.53)
71 (15.6)
367 (80)
70/50°F
850 (4.13)
121 (24.4)
189 (38)
10.7 lbs. (4.9 kg) 480pcs.
Mechanical Switch
R404A, 0 lb. 15.2 oz. (430g)
AMBIENT TEMP.
(ºF/ºC)
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
495
487
484
482
309
338
347
548
280
281
281
283
65
65
66
66
TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR
WATER FLOW FOR CONDENSER
PRESSURE DROP OF COOLING WATER LINE
50/10
850
852
853
852
29
30
30
30
2.9
2.7
2.7
2.4
225
221
219
218
1.17
1.28
1.31
2.07
19.7
19.8
19.8
19.9
4.6
4.6
4.6
4.6
WATER TEMP. (ºF/ºC)
70/21
484
219
469
213
457
207
454
206
853
857
860
860
347
1.31
396
1.50
438
1.66
556
2.11
30
31
32
32
2.7
2.4
2.2
2.2
281
19.8
283
19.9
285
20.0
286
20.1
66
4.6
66
4.7
67
4.7
67
4.7
470
456
443
431
737
974
944
1409
286
289
290
295
67
67
68
69
90/32
854
856
860
860
31
32
33
34
2.6
2.4
2.1
2.1
213
207
201
196
2.79
3.69
3.57
5.34
20.1
20.3
20.4
20.7
4.7
4.7
4.8
4.9
8,100 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
1,200 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
56 gal./h [AT 100ºF (38ºC) / WT 90ºF (32ºC)]
less than 10 PSIG
ENG.F-011.1.0205
57
5. KM-515MRJ with URC-5F
Specification Sheet
AC SUPPLY VOLTAGE
AMPERAGE
MINIMUM CIRCUIT AMPACITY
MAXIMUM FUSE SIZE
ELECTRIC & WATER CONSUMPTION
ELECTRIC W (kWH/100 lbs.)
WATER gal./24HR (gal./100 lbs.)
ICE PRODUCTION PER CYCLE
BIN CONTROL SYSTEM
REFRIGERANT CHARGE
Performance Data Sheet
APPROXIMATE ICE PRODUCTION
PER 24 HR.
lbs./day kg./day
APPROXIMATE ELECTRIC
CONSUMPTION
watts
APPROXIMATE WATER
CONSUMPTION PER 24 HR.
gal./day m3/day
FREEZING CYCLE TIME
min.
HARVEST CYCLE TIME
min.
HEAD PRESSURE
PSIG kg/cm2G
SUCTION PRESSURE
PSIG
kg/cm2G
115/60/1
12.8 A
20 A
20 A
90/70°F
70/50°F
960 (5.10)
900 (4.28)
93 (20.5)
196 (39.0)
10.7 lbs. (4.8 kg) 480pcs.
Mechanical Switch
TOTAL R404A, 4 lb. 4.8 oz. (1950g)
ICEMAKER, 2 lb. 6.8 oz. (1100g)
CONDENSER, 1 lb. 14 oz. (850g)
AMBIENT TEMP.
(ºF/ºC)
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
504
493
489
476
196
173
166
128
205
217
220
225
56
57
57
57
50/10
900
913
918
925
27
28
28
29
4.2
3.9
3.7
3.1
TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR
228
223
222
216
0.74
0.66
0.63
0.49
14.4
15.2
15.5
15.8
3.9
4.0
4.0
4.0
WATER TEMP. (ºF/ºC)
70/21
489
222
470
213
454
206
444
201
918
941
960
967
166
0.63
126
0.48
93
0.35
89
0.34
28
30
32
32
3.7
3.1
2.5
2.5
220
15.5
240
16.9
257
18.1
262
18.5
57
4.0
58
4.1
59
4.1
59
4.2
453
424
411
372
143
114
76
60
243
264
280
302
58
59
60
61
90/32
947
973
991
1020
30
32
34
35
3.4
2.9
2.3
2.1
205
192
187
169
0.54
0.43
0.29
0.23
17.1
18.5
19.7
21.2
4.1
4.1
4.2
4.3
7,600 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
1,100 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
ENG.F-011.1.0205
58
6. KM-650MAJ
Specification Sheet
AC SUPPLY VOLTAGE
AMPERAGE
MINIMUM CIRCUIT AMPACITY
MAXIMUM FUSE SIZE
ELECTRIC & WATER CONSUMPTION
ELECTRIC W (kWH/100 lbs.)
WATER gal./24HR (gal./100 lbs.)
ICE PRODUCTION PER CYCLE
BIN CONTROL SYSTEM
REFRIGERANT CHARGE
Performance Data
APPROXIMATE ICE PRODUCTION
PER 24 HR.
lbs./day kg./day
APPROXIMATE ELECTRIC
CONSUMPTION
watts
APPROXIMATE WATER
CONSUMPTION PER 24 HR.
3
gal./day m /day
FREEZING CYCLE TIME
min.
HARVEST CYCLE TIME
min.
HEAD PRESSURE
2
PSIG kg/cm G
SUCTION PRESSURE
PSIG
kg/cm2G
115/60/1
14.8 A
20 A
20 A
90/70°F
1270 (5.41)
80 (14.2)
10.8 lbs. (4.9 kg) 480pcs.
Mechanical Switch
R404A, 1 lb. 5 oz. (595g)
AMBIENT TEMP.
(ºF/ºC)
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
630
615
610
599
197
170
162
124
255
269
274
281
57
58
58
59
TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR
70/50°F
1200 (4.57)
197 (31.2)
50/10
1200
1216
1221
1225
21
22
22
22
3.5
3.2
3.1
2.6
286
279
277
272
0.74
0.65
0.61
0.47
17.9
18.9
19.2
19.7
4.0
4.1
4.1
4.1
WATER TEMP. (ºF/ºC)
70/21
610
277
584
265
562
255
552
250
1221
1248
1270
1276
162
0.61
117
0.44
80
0.30
78
0.30
22
24
25
25
3.1
2.5
2.0
2.0
274
19.2
298
21.0
319
22.4
326
22.9
58
4.1
59
4.2
60
4.2
61
4.3
572
540
520
481
147
119
74
68
303
329
350
378
60
62
63
66
90/32
1247
1273
1296
1320
23
25
26
27
2.9
2.6
2.0
2.0
260
245
236
218
0.56
0.45
0.28
0.26
21.3
23.2
24.6
26.6
4.3
4.4
4.4
4.6
10,400 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
1,700 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
59
ENG.F-011.1.0205
7. KM-650MWJ
Specification Sheet
AC SUPPLY VOLTAGE
AMPERAGE
MINIMUM CIRCUIT AMPACITY
MAXIMUM FUSE SIZE
ELECTRIC & WATER CONSUMPTION
ELECTRIC W (kWH/100 lbs.)
WATER gal./24HR (gal./100 lbs.)
WATER COOLED CONDENSER
gal./24HR (gal./100 lbs.)
ICE PRODUCTION PER CYCLE
BIN CONTROL SYSTEM
REFRIGERANT CHARGE
Performance Data Sheet
APPROXIMATE ICE PRODUCTION
PER 24 HR.
lbs./day kg./day
APPROXIMATE ELECTRIC
CONSUMPTION
watts
APPROXIMATE WATER
CONSUMPTION PER 24 HR.
gal./day m3/day
FREEZING CYCLE TIME
min.
HARVEST CYCLE TIME
min.
HEAD PRESSURE
PSIG kg/cm2G
SUCTION PRESSURE
PSIG
kg/cm2G
115/60/1
12.6 A
20 A
20 A
90/70°F
1160 (4.40)
96 (15.1)
921 (145)
70/50°F
1150 (4.25)
203 (31.4)
455 (70)
10.7 lbs. (4.8 kg) 480pcs.
Mechanical Switch
R404A, 0 lb. 15.2 oz. (430g)
AMBIENT TEMP.
(ºF/ºC)
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
647
644
643
627
658
738
763
1100
50/10
1150
1152
1153
1160
235
237
237
240
55
55
56
56
TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR
WATER FLOW FOR CONDENSER
PRESSURE DROP OF COOLING WATER LINE
20
21
21
22
3.4
3.1
3.0
2.6
293
292
292
285
2.49
2.79
2.89
4.16
16.5
16.6
16.7
16.9
3.9
3.9
3.9
3.9
WATER TEMP. (ºF/ºC)
70/21
643
292
639
290
635
288
625
283
1153
1157
1160
1165
763
2.89
901
3.41
1017
3.85
1183
4.48
21
22
22
22
3.0
2.5
2.0
2.0
237
16.7
240
16.9
243
17.1
245
17.2
56
3.9
56
4.0
57
4.0
57
4.0
610
590
592
553
1326
1698
1726
2378
245
250
252
260
57
58
59
60
90/32
1169
1180
1181
1200
22
24
24
26
2.9
2.6
2.0
2.0
277
268
269
251
5.02
6.43
6.53
9.00
17.2
17.6
17.7
18.3
4.0
4.1
4.1
4.2
11,100 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
1,500 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
96 gal./h [AT 100ºF (38ºC) / WT 90ºF (32ºC)]
less than 10 PSIG
ENG.F-011.1.0205
60
8. KM-650MRJ with URC-5F
Specification Sheet
AC SUPPLY VOLTAGE
AMPERAGE
MINIMUM CIRCUIT AMPACITY
MAXIMUM FUSE SIZE
ELECTRIC & WATER CONSUMPTION
ELECTRIC W (kWH/100 lbs.)
WATER gal./24HR (gal./100 lbs.)
ICE PRODUCTION PER CYCLE
BIN CONTROL SYSTEM
REFRIGERANT CHARGE
Performance Data Sheet
APPROXIMATE ICE PRODUCTION
PER 24 HR.
lbs./day kg./day
APPROXIMATE ELECTRIC
CONSUMPTION
watts
APPROXIMATE WATER
CONSUMPTION PER 24 HR.
gal./day m3/day
FREEZING CYCLE TIME
min.
HARVEST CYCLE TIME
min.
HEAD PRESSURE
PSIG kg/cm2G
SUCTION PRESSURE
PSIG
kg/cm2G
115/60/1
16.1 A
20 A
20 A
90/70°F
70/50°F
1230 (5.25)
1150 (4.36)
85 (15.0)
191 (30.3)
11.3 lbs. (5.1 kg) 480pcs.
Mechanical Switch
TOTAL R404A, 4 lb. 4.8 oz. (1950g)
ICEMAKER, 2 lb. 6.8 oz. (1100g)
CONDENSER, 1 lb. 14 oz. (850g)
AMBIENT TEMP.
(ºF/ºC)
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
632
617
612
601
191
168
160
125
230
233
234
249
50
50
50
51
TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR
50/10
1150
1168
1173
1175
22
23
23
23
3.6
3.2
3.1
2.6
287
280
278
272
0.72
0.63
0.61
0.47
16.2
16.4
16.5
17.5
3.5
3.5
3.5
3.6
WATER TEMP. (ºF/ºC)
70/21
612
278
586
266
564
256
554
251
1173
1204
1230
1235
160
0.61
119
0.45
85
0.32
83
0.31
23
24
25
26
3.1
2.5
2.0
2.0
234
16.5
240
16.8
244
17.2
254
17.8
50
3.5
51
3.6
51
3.6
51
3.6
574
541
521
482
145
119
78
72
266
286
285
322
52
53
53
55
90/32
1197
1223
1251
1270
25
26
27
29
3.0
2.6
2.0
2.0
260
246
236
219
0.55
0.45
0.30
0.27
18.7
20.1
20.0
22.6
3.7
3.7
3.7
3.9
10,200 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
1,500 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
ENG.F-011.1.0205
61
62
384±22
0 PSIG
412± 0 PSIG
327±22 PSIG
Cut-out
Cut-in
284±22 PSIG
Water-Cooled Model
22
Air-Cooled Model
* High-Pressure Switch
B. Wiring Diagrams
1. KM-340M_J
*
*
63
384±22
0 PSIG
284±22 PSIG
Cut-out
Cut-in
327±22 PSIG
412±220 PSIG
Water-Cooled Model Air and Remote Models
* High-Pressure Switch
2. KM-515M_J and KM-650M_J
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