Hoshizaki KMD-460MAJ User manual

Model
KMD-460MAJ, MWJ
KMD-530MAJ, MWJ, MRJ
Modular Crescent Cuber with
Service Manual
Number: 73235
Issued: 2-21-2019
Revised: 9-20-2019
hoshizakiamerica.com

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WARNING
Only qualied service technicians should install and service the appliance. To
obtain the name and phone number of your local Hoshizaki Certied 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 and may result in costly water
damage. Proper installation is the responsibility of the installer. Product failure or
property damage due to improper installation is not covered under warranty.
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: [phone]
Fax: [phone]
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.

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CONTENTS
Important Safety Information ................................................................................................. 5
I. Construction and Water/Refrigeration Circuit Diagram ....................................................... 7
A. Construction.................................................................................................................. 7
1. Air-Cooled (MAJ)...................................................................................................... 7
2. Water-Cooled (MWJ) ............................................................................................... 8
3. Remote Air-Cooled (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
B. Service Diagnosis ....................................................................................................... 15
C. Control Board Check................................................................................................... 23
D. Bin Control Check ....................................................................................................... 24
E. Float Switch Check and Cleaning ............................................................................... 26
F. Thermistor Check......................................................................................................... 28
G. Switches ..................................................................................................................... 29
1. Control Switch ........................................................................................................ 29
2. Service Switch....................................................................................................... 29
H. Diagnostic Tables ........................................................................................................ 30
I. Freeze-Up Check List ................................................................................................... 34
III. Controls and Adjustments............................................................................................... 35
A. Control Board Layout ................................................................................................. 36
B. LED Lights and Audible Alarm Safeties....................................................................... 37
C. Settings and Adjustments............................................................................................ 38
1. Default Dip Switch Settings .................................................................................... 38
2. Harvest Time (S4 dip switch 1 & 2)........................................................................ 39
3. Pump-Out Time/Harvest Time During Pump-Out (S4 dip switch 3 & 4)................. 39
4. Pump-Out Frequency Control (S4 dip switch 5)..................................................... 40
5. Harvest Pump Time (Harvest Assist Duration) (S4 dip switch 6) ........................... 40
6. Harvest Pump Time (Harvest Assist) (S4 dip switch 7) ......................................... 41
7. Factory Use (S4 dip switch 8)................................................................................. 41
8. Freeze Timer (S4 dip switch 9 & 10) ...................................................................... 42
9. Float Switch Selector (S5 dip switch 1) ................................................................. 42
10. Rell Counter (S5 dip switch 2 and 3) ................................................................... 42
11. Minimum Harvest Time (S5 dip switch 4) ............................................................... 43
12. Slush Control (S5 dip switch 5) ............................................................................. 43
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.

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IV. Refrigeration Circuit and Component Service Information.............................................. 44
A. Refrigeration Circuit Service Information .................................................................... 44
B. Component Service Information.................................................................................. 47
C. Water Regulating Valve Adjustment (water-cooled model) .......................................... 47
V. Maintenance .................................................................................................................... 48
VI. Preparing the Appliance for Periods of Non-Use ............................................................ 49
VII. Disposal......................................................................................................................... 51
VIII. Technical Information.................................................................................................... 52
A. Specication and Performance Data Sheets............................................................... 52
1. KMD-460MAJ......................................................................................................... 52
2. KMD-460MWJ ....................................................................................................... 53
3. KMD-530MAJ ........................................................................................................ 54
4. KMD-530MWJ ....................................................................................................... 55
5. KMD-530MRJ ........................................................................................................ 56
B. Wiring Diagram ........................................................................................................... 57

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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 re, follow basic
precautions including the following:
• Only qualied 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, re, or damage.
• The icemaker requires an independent power supply of proper capacity. See the
nameplate for electrical specications. 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 re.
• 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 or service switch
with damp hands.
• Do not make any alterations to the unit. Alterations could result in electric shock,
injury, re, 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.

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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 ammable substances near the
appliance. They might catch re.
• 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 oor
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.

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I. Construction and Water/Refrigeration Circuit Diagram
A. Construction
1. Air-Cooled (MAJ)
Control Box
Spray Tubes
Float Switch
Pump Motor
Compressor
Bin Control
Drier
Condenser
Fan Motor
Condenser
Hot Gas Valve
Water Supply Inlet
Thermostatic
Expansion
Valve
Drain Valve
Inlet Water
Valve
Control Switch
Wash
Valve
High-Pressure
Switch
Service Switch

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2. Water-Cooled (MWJ)
Water
Regulator
Control Box
Spray Tubes
Float Switch
Pump Motor Compressor
Bin Control
Drier
Condenser
Hot Gas Valve
Water Supply Inlet
Drain Valve
Inlet Water Valve
Control Switch
Thermostatic
Expansion
Valves
Service Switch
High-Pressure
Switch
Wash
Valve

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3. Remote Air-Cooled (MRJ)
Control Box
Spray Tubes
Float Switch
Pump Motor
Compressor
Bin Control
Drier
Receiver
Hot Gas Valve
Water Supply Inlet
Drain Valve
Inlet Water Valve
Control Switch
Thermostatic
Expansion
Valves
Service Switch
High-Pressure
Switch
Wash
Valve
Liquid Line Valve
Crankcase Heater
Junction
Box

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B. Water/Refrigeration Circuit Diagram
1. Air-Cooled Models (MAJ)
Spray Tubes
Water Supply Inlet
Condenser
Condenser
Fan Motor
Drier
Hot Gas Valve
Compressor
Float Switch
Water Pump
Thermostatic Expansion Valve
Inlet Water Valve
Drain Valve
Wash Valve
Thermistor
Strainer
High-Pressure
Switch
Heat Exchanger
Drain

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2. Water-Cooled Models (MWJ)
Spray Tubes
Water Supply Inlet
Condenser
Drier
Hot Gas Valve
Compressor
Float Switch
Water Pump
Thermostatic Expansion Valve
Inlet Water Valve
Drain Valve
Thermistor
Strainer
High-Pressure
Switch
Heat Exchanger
Water Regulating
Valve
Drain
Wash Valve

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3. Remote Models (MRJ)
Spray Tubes
Water Supply Inlet
Condenser
Condenser
Fan Motor
Drier
Hot Gas Valve
Compressor
Float Switch
Water Pump
Thermostatic Expansion Valve
Inlet Water Valve
Drain Valve
Thermistor
Strainer
High-Pressure
Switch
Heat Exchanger
Headmaster
Receiver
Liquid Line
Valve
Drain
Wash Valve

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II. Sequence of Operation and Service Diagnosis
A. Sequence of Operation Flow Chart
1. Operation Flow Chart
FS check
1 to 3-min. harvest timer in control (S4 dip switch 1 & 2)
Legend: BC–bin control CB–control board Comp–compressor FM–fan motor FMR–fan motor-remote FS–oat switch HGV–hot gas valve HPT–harvest pump time LLV –liquid line valve PM–pump motor WV–inlet water valve
Components Energized when the Control Switch is in the "SERVICE" Position When in the "SERVICE" position, the control switch supplies power to the service switch and the icemaker is in service mode. The service switch has three positions: "DRAIN," "CIRC." and "WASH." See the information below for details of each function.
DRAIN Power is supplied to the pump and drain valve. This drains the water tank. CIRC. Power is supplied to the pump only. This operation can be used to circulate cleaner and
sanitizer over the outside surface of the evaporator for extended periods of time.
WASH Power is supplied to the pump and wash valve. This operation is used to circulate cleaner
and sanitizer over both the inside and outside surfaces of the evaporator.
Operation Flow Chart
1. 1-Minute
Fill Cycle
Cycle Steps
2. Harvest Cycle
• WV time: 6 min. or the length of harvest minus
HPT setting (S4 dip switch 6), whichever is shorter.
• Max. harvest time: 20 min.
Thermistor in control
3. Freeze Cycle
• Min. freeze time: 5 min. • Max. freeze time: freeze timer setting
(S4 dip switch 9 & 10).
FS in control
4. Pump-Out Cycle
• 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)
WV energized
FS open
Comp energized FMR energized HGV energized WV energized
Thermistor temperature reaches 48°F (9°C) (3.9 kΩ or less). Harvest timer starts.
FS open
Comp energized FM energized FMR energized LLV energized PM energized HGV de-energized
FS closed
Comp energized FMR energized HGV energized LLV de-energized PM de-energizes for 2 sec., then reverses for 10/20 sec.
FS check
Startup
If FS is open, Comp stops and cycle returns to 1-Min. ll.
5-min. minimum freeze timer in control
FS closed
FS opens or freeze timer terminates
50 sec.
PM energized WV de-energized
Harvest Pump Time
Slush Control Thermistor temperature reaches 36°F (2.2°C) (5.8 kΩ).
PM de-energized for 10 sec.

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2. Shutdown Flow Chart
Shutdown Flow Chart
1. Bin Full
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.
Shutdown and Restart
BC Operation
BC open (BC actuator paddle engaged) Green "BC CLOSED" LED off Yellow "BC OPEN" LED on
Yellow "BC OPEN" LED continues. All components de-energized.
2. Icemaker Off All components de-energized.
3. Ice Level Lowered
Icemaker starts at "1. 1-Minute Fill Cycle."
BC closed (BC actuator paddle disengaged) Green "BC CLOSED" LED on Yellow "BC OPEN" LED off
To 1. 1-Minute Fill Cycle
Legend: BC–bin control

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B. Service Diagnosis
WARNING
• The appliance should be diagnosed and repaired only by qualied service
personnel to reduce the risk of death, electric shock, serious injury, or re.
• 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.C. Control
Board Check." Check 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 exible. 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.
Conrm 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, left side, and top and 12" (30 cm) clearance
at right side for air-cooled models. Allow 6" (15 cm) clearance at rear, sides, and
top for water cooled and remote models 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.
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 BC is closed and the 115VAC 10A fuse is good.

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1. 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 green "BC CLOSED" LED turn
on. If yellow "BC OPEN" LED is on (indicating a full bin), check BC. Move ice away from
BC actuator paddle. If yellow "BC OPEN" LED stays on, see "II.D. 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.C. Control Board Check."
• Conrm 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 yellow "BC OPEN" LED is on,
see "II.D. Bin Control Check."
a) Power On Diagnosis: If CB red "POWER OK" LED is off, conrm 10A fuse is good.
Check for 115VAC at control switch #2 (BK) to neutral (W) then at control switch
#3(P) to neutral (W). If 115VAC is present on #2 (BK) and not on #3(P), replace
control switch. If 115VAC is present on control switch #3 (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 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 tting. On water-cooled models, conrm WRV opens in freeze
cycle.
Conrm that the location meets installation requirements. See the appliance's
instruction manual for details.
4) 1-Min. Fill Cycle – LED 4 is on. WV and X11 relay energize. Water begins to ll the
water tank. After 1 min., CB checks for a closed FS. If FS is closed, the harvest cycle
begins (X10, X12, X14, Comp, HGV, and FMRenergize), 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 lters 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 lls, but the appliance fails to
start harvest (Comp energized), check for open FS. See "II.E. Float Switch Check and
Cleaning." If FS is closed and CB fails to start the harvest cycle after 1 min., replace
CB.

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5a) Initial Harvest Cycle – LEDs 1, 4, and 2 are on. WV and X11 relay continue. Comp,
HGV, X10, X12, and X14 relays 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). The harvest timer has settings of 60, 90, 120, and 180
sec. The pump-out timer (S4 dip switch 3 & 4) acts in place of the harvest timer during
cycles with a pump-out (S4 dip switch 5). WV and X11 relay are energized during
harvest for a maximum of 6 min. or the length of harvest minus 50sec., whichever is
shorter. 50sec. before harvest terminates, PM energizes. See step 5b below.
a) Comp Diagnosis: Check that evaporator is warming. Ifnot, conrm 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, conrm contacts are closed.
If not, replace CR. If CR contacts are closed, check 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: Conrm that LLV is de-energized and closed (not bypassing).
Ifenergized, replace CB. If de-energized and bypassing, replace LLV.
d) WRV Diagnosis: Conrm WRV is not leaking by. If WRV is leaking by, conrm 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 model)."
e) CCH Diagnosis (remote model): Conrm X14 relay energizes, de-energizing the
CCH.

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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, HGV, X10, X12, and X14 relays continue.
a) Thermistor Diagnosis: Place a thermometer on the suction line next to the
thermistor. Has it warmed to 48°F (9°C) or warmer? Conrm thermistor status. See
"II.F. Thermistor Check."
b) Control Board Diagnosis: Ifthe thermistor reading is in proper range, dip switch 7 is
on, and WV continues, check for 115VAC at CB K1 #6 (O) to neutral (W). 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) to neutral (W). If115VAC is not present, replace CB.
c) Relay Diagnosis: If 115VAC is present and PM is not energized, check for 115VAC at
X10relay #8 (Y) to neutral (W). If 115VAC is not present on X10 relay #8 (Y), check
for 115VAC at X10 relay #4 (P) and X10 relay #6(Y) to neutral (W) (latching circuit). If
115VAC is present at X10 relay #4(P) and not at X10 relay #6(Y), replace X10 relay.
If 115VAC is present on X10 relay #8 (Y) and PM is not energized, check for 115VAC
at X10 relay #3 (R) and X10 relay #5(DBU) to neutral (W). If 115VAC is present at
X10 relay #5(DBU) and not at X10 relay #3 (R), replace X10 relay.
d) Control Switch Diagnosis: If115VAC is present at X10relay #3 (R), check for
115VAC at control switch #6 (R) to neutral (W). Next, check for 115VAC at control
switch #5 (Y) to neutral (W). If 115VAC is present at control switch #6 (R) and not at
control switch #5 (Y), check control switch continuity. Ifcontacts are open, replace
control switch.
e) Pump Motor Diagnosis: If115VAC is present at control switch #5 (Y), 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.F.Thermistor Check." If 1-min. ll cycle
starts after harvest timer terminates, check that FS is clean and operating properly, see
"II.E. 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.

19
6) Freeze Cycle – LED 1 is on. Comp, PM, and X14 relay continue. FMR, FM, and LLV
energize. HGV, X10, and X12 relays 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.
Slush Control: When slush control 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.
a) Freeze Cycle Diagnosis: Conrm Comp, PM, and X14 relay continue. Conrm
that FMR, FM, and LLV energize. Conrm WRV opens. Next, conrm HGV, X10,
and X12 relays de-energize. During the rst 5 min. of freeze, conrm evaporator is
cooling. Ifnot, conrm WV de-energized (not leaking by), HGV de-energized (not
bypassing), FM, FMR, and LLV energize, TXV and HM operate correctly, WRV
opens, Comp is efficient, and refrigerant charge is correct. See "VIII.A. Specication
and Performance Data Sheets."
b) Comp and FMR Diagnosis: If Comp de-energizes once freeze begins, check that
appliance has not shut off on HPS ("POWER OK" LED off). If so, check "3)b) HPS
Diagnosis." If "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.
Comp: 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. Specication and Performance Data Sheets."
FMR: 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 eld
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: Conrm water is owing 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 #6 (R) to neutral (W) and control
switch #5 (Y) to neutral (W). If 115VAC is present at control switch #6 (R) and not at
control switch #5 (Y), check control switch continuity. Replace as needed. If 115VAC
is present at control switch #5 (Y) to neutral (W), check PM capacitor and motor
winding continuity.

20
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.
f) Refrigerant Pressures, HM, and TXV Diagnosis: If evaporator is still not cooling,
check refrigerant pressures. See "VIII.A. Specication 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.
Specication 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.E. 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. Specication and Performance Data Sheets."
i) Short Freeze Cycle Diagnosis: Conrm water tank lls and overows during 1 min.
ll and harvest cycles. If not, check water supply lters, shut-off valve, WV screen.
Ifwater tank empties before 5 min. timer terminates and freeze cycle is short, check
that DV is not leaking by or energized (water owing through DV). If DV is leaking by,
remove and clean DV, replace as needed. If water tank is full, see "II.E. Float Switch
Check and Cleaning." for erratic operating FS.