Hoshizaki KMS-1402MLJ Service Manual

Hoshizaki KMS-1402MLJ Service Manual
Service Manual
Modular Crescent Cuber
Model
KMS-1402MLJ
Including
Condensing Unit Models
SRK-15J/3
hoshizakiamerica.com
Number: 73224
Issued: 5-16-2018
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 installation or service should be
undertaken until the technician has thoroughly read this Service Manual. Likewise,
the owner/manager should not proceed to operate the appliance until the installer
has instructed them on its proper operation. Failure to install, operate, 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.
Hoshizaki provides this manual primarily to assist qualified service technicians in the
installation, maintenance, and 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: techsupport@hoshizaki.com
618 Highway 74 South
Peachtree City, GA 30269
Attn: Hoshizaki Technical Support Department
NOTE: To expedite assistance, all correspondence/communication MUST include the
following information:
• Model Number
• Serial Number
• Complete and detailed explanation of the problem.
2
IMPORTANT
This manual should be read carefully before the icemaker is serviced. Read
the warnings and guidelines contained in this booklet carefully as they provide
essential information for the continued safe use, service, and maintenance of the
icemaker. Retain this booklet for any further reference that may be necessary.
CONTENTS
Important Safety Information.................................................................................................. 5
I. Construction and Water/Refrigeration Circuit Diagrams...................................................... 7
A. Construction.................................................................................................................. 7
1. Icemaker .................................................................................................................. 7
2. Condensing Unit ...................................................................................................... 8
B. Water Circuit/Refrigeration Circuit Diagram.................................................................... 9
II. Sequence of Operation and Service Diagnosis................................................................ 10
A. Sequence of Operation Flow Chart.............................................................................. 10
1. Operation Flow Chart ............................................................................................. 10
2. Shutdown Flow Chart..............................................................................................11
3. Freeze-Time Correction Chart................................................................................ 12
B. Service Diagnosis........................................................................................................ 13
C. Freeze-Time Correction Cycle (90 min.)...................................................................... 22
D. Control Board Check.................................................................................................... 24
E. Bin Control Check........................................................................................................ 26
F. Float Switch Check and Cleaning................................................................................. 28
G. Thermistor Check......................................................................................................... 30
H. Switches....................................................................................................................... 31
1. Control Switch......................................................................................................... 31
2. Service Switch........................................................................................................ 31
I. Diagnostic Tables........................................................................................................... 32
J. Freeze-Up Check List................................................................................................... 36
III. Settings and Adjustments................................................................................................ 37
A. Control Board Layout................................................................................................... 38
B. LED Lights and Audible Alarm Safeties........................................................................ 39
C. Settings and Adjustments............................................................................................. 40
1. Default Dip Switch Settings..................................................................................... 40
2. Harvest Time (S4 dip switch 1 & 2)........................................................................ 41
3. Pump-Out Time/Harvest Time During Pump-Out (S4 dip switch 3 & 4).................. 41
4. Pump-Out Frequency Control (S4 dip switch 5)...................................................... 42
5. Harvest Pump Time (Harvest Assist Duration) (S4 dip switch 6)............................ 42
6. Harvest Pump Time (Harvest Assist)/Freeze-Time Correction (S4 dip switch 7)... 43
7. Factory Use (S4 dip switch 8)................................................................................. 43
8. Freeze Timer (S4 dip switch 9 & 10)....................................................................... 44
9. Float Switch Control Selector (S5 dip switch 1)...................................................... 44
10. Refill Counter (S5 dip switch 2 and 3)................................................................... 45
11. Minimum Harvest Time (S5 dip switch 4).............................................................. 45
12. Anti-Slush (S5 dip switch 5).................................................................................. 45
3
IV. Refrigeration Circuit and Component Service Information.............................................. 46
A. Refrigeration Circuit Service Information..................................................................... 46
B. Component Service Information................................................................................... 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. KMS-1402MLJ with SRK-15J.................................................................................. 54
2. KMS-1402MLJ with SRK-15J3............................................................................... 55
3. SRK-15J................................................................................................................. 56
4. SRK-15J3............................................................................................................... 57
B. Wiring Diagrams........................................................................................................... 58
1. Wire Harness Connections...................................................................................... 58
2. KMS-1402MLJ with SRK-15J................................................................................. 59
3. KMS-1402MLJ with SRK-15J3............................................................................... 60
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
This 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.
• This appliance must be installed in accordance with applicable national, state, and
local codes and regulations. Failure to meet these code requirements could result in
death, electric shock, serious injury, fire, or damage to the appliance.
• To reduce the risk of electric shock, do not touch the control switch or service switch
with damp hands.
• Before Servicing the KMS or SRK: To reduce the risk of electric shock, move
the control switch to the "OFF" position and turn off the power supply to the
SRK condensing unit. Place the KMS disconnect (if applicable) in the "OFF"
position. Lockout/Tagout to prevent the power supply from being turned back on
inadvertently.
• Do not make any alterations to the appliance. Alterations could result in electric
shock, injury, fire, or damage to the appliance.
• This 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.
• 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.
5
WARNING, continued
For KMS
• Risk of electric shock. Control switch in "OFF" position does not de-energize all
loads.
• Power supply and ground connection are supplied from the SRK remote condensing
unit via the wire harness provided. Do not connect the wire harness leads to an
external power source.
• Wire harness routing (conduit) and disconnect (if required) 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 damage to
the appliance.
• THE APPLIANCE MUST BE GROUNDED. Failure to properly ground the appliance
could result in death, serious injury, or damage to the appliance.
For SRK
• 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 damage to the appliance.
• The remote condensing unit 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 REMOTE CONDENSING UNIT MUST BE GROUNDED. Failure to properly
ground the remote condensing unit could result in death, serious injury, or damage
to the appliance.
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 appliance on during extended periods of non-use, extended
absences, or in sub-freezing temperatures. To properly prepare the appliance 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/storage bin is for ice use only. Do not store anything else in the
dispenser unit/storage bin.
6
I. Construction and Water/Refrigeration Circuit Diagrams
A. Construction
1. Icemaker
Spray Tubes
Wash Valve
Hot Gas Valve
Harvest Water Valve (WV2)
Liquid Line Valve
Liquid Line
Shutoff Valve
Evaporator
Drier
Suction Line
Shutoff Valve
Thermistor
Control Board
Control Box
Fill/Refill Water Valve (WV1)
Control Switch
Service Switch
Pump Motor
Fuse
Switch Box
Float Switch
Drain Water Valve
Bin Control
Switch Cover
Switch Mount
Extension Bracket
Bin Control
7
Switch Bracket
2. Condensing Unit
SRK-15J Control Box
SRK-15J3 Control Box
Fuse
Fuse
Condenser
Headmaster (C.P.R.)
Liquid Line Valve
Hot Gas Valves
Suction Line
Shutoff Valve
Liquid Line
Shutoff Valve
Check Valve
Fan Motors and Fan Blades
Liquid Line Shutoff Valve 2
Discharge Line Shutoff Valve
Thermostat (Discharge Pipe)
Receiver
Accumulator
Crankcase Heater
Compressor
High Pressure Switch
8
Fill/Refill Water
Valve (WV (WV 1)
Water Tank
Evaporator
Spray Tube
Pump Motor
Harvest Water
Valve (WV 2)
KMS-1402MLJ
Drain
Water Supply
9
Drain Valve
Float Switch
Expansion Valves
Check Valves
SRK-15J/3
Fan
Compressor
Discharge
Line
Suction Line
Receiver
Accumulator
Hot Gas
Valve Body
Strainer
Service Valve
Thermistor
Liquid Line
Shutoff Valve
Liquid Line
Shutoff Valve
Drier
Service Valve
Liquid Line Valve Body
Wash Valve
High-Pressure
Switch
Strainer
Liquid Line Valve
Hot Gas Valves
Service Valve
Headmaster
(C.P. R.)
Check Valve
Access Valve
Discharge Line
Shutoff Valve
Discharge Line
Thermostat
Strainers
Condenser
B. Water Circuit/Refrigeration Circuit Diagram
Startup
Cycle
Steps
Comp energized
FMRs energized
HGVs energized
WV2 energized
WV1 de-energized
FS closed
Thermistor
in control
10
Legend:
Comp-compressor
DV-drain valve
FMRs-fan motors-remote
F/S-float switch
HGVs-hot gas valves (KMS and SRK)
LLVs-liquid line valves (KMS and SRK)
PM-pump motor
WV1-fill/refill water valve
WV2-harvest water valve
FS check
Comp energized
FMRs energized
HGVs energized
DV energized
PM stops for 2 sec., then
energized for 10/20 sec.
LLV de-energized
When freeze time differential exceeded,
freeze-time correction cycle starts.
See "II.A.3. Freeze-Time Correction Chart."
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)
4. Pump-Out Cycle
Power is supplied to the pump and drain valve. This drains the water tank.
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.
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.
DRAIN
CIRC.
WASH
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.
Comp energized
FMRs energized
PM energized
LLVs energized
WV1 energized first
1 min. of freeze
HGVs de-energized
FS closed
Refill
1 min.
5-min minimum
freeze timer in
control
• Min. freeze time: 5 min.
• Max. freeze time: freeze timer setting
(S4 dip switch 9 & 10).
3. Freeze Cycle
Components Energized when the Control Switch is in the "SERVICE" Position
FS open
Thermistor temperature reaches
48°F (9°C) (3.9 kΩ or less). Harvest
timer starts.
PM energized
WV2 de-energized
50 sec.
Harvest Pump
Time
1 to 3-min. harvest timer in
control (S4 dip switch 1 & 2)
• WV time: 6 min. or the length of harvest minus HPT
setting (S4 dip switch 6), whichever is shorter.
• Max. harvest time: 20 min.
2. Harvest Cycle
1. Operation Flow Chart
If FS is open, Comp stops and cycle
returns to 1-Min. fill.
FS open
WV1 energized
FS check
1. 1-Minute
Fill Cycle
Operation Flow Chart
II. Sequence of Operation and Service Diagnosis
A. Sequence of Operation Flow Chart
BC Operation
Shutdown
and Restart
11
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
Note: 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
12
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
FMRs energized
HGVs 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
FMRs de-energized
HGVs 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
FMRs–fan motor-remote
HGVs–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.
Freeze-Time Correction Flow Chart
3. Freeze-Time Correction Chart
B. Service Diagnosis
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.
• Risk of electric shock. Use extreme caution and exercise safe electrical practices.
• Risk of electric shock. Control switch (KMS) in "OFF" position does not
de‑energize all loads.
• Moving parts (e.g., fan blade) can crush and cut. Keep hands clear.
• 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/storage bin.
• Make sure all food zones in the icemaker and dispenser unit/storage bin are clean
after service. For cleaning procedures, see "V. Maintenance."
1. Diagnostic Procedure
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.
Note: • When checking high voltage (115VAC), always choose a neutral (W) to establish
a good neutral connection.
• On 3-phase models, the neutral (W) is provided through MT. To confirm a good
neutral (W), check for 60VAC from neutral (W) to ground (GND). If 60VAC is
present, neutral (W) is good. If 60VAC is not present, check 208-230VAC main
power supply to MT. If 208-230VAC is present, check MT continuity.
• 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. Clear any ice from BC.
2) Check that the 115VAC 10A fuses in the KMS and SRK are good.
Confirm that the location meets installation requirements:
KMS-1402MLJ:
• 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).
• No clearance is required for proper operation
• The appliance should not be located in a corrosive environment.
SRK-15J/3:
• A dry and well ventilated area with 24" (61 cm) clearance in both front and rear for
proper air circulation and ease of maintenance and/or service should they be required.
13
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 on
both the KMS and the SRK are good. Confirm wire harness is connected and not
damaged. Next, check SRK switches. Check for 115VAC at both HPS wires (BR) to
neutral (W). If 115VAC is present on one and not the other, HPS is open. If HPS is
open, see "b) HPS Diagnosis" below. If HPS is closed, check for 115VAC at both
DLT wires (BR) to neutral (W). If 115VAC is present on one and not the other, DLT
is open. If DLT is open, see "c) DLT Diagnosis" below. If DLT is closed, check for
115VAC at control switch #2 (BR) to neutral (W) then at control switch #3 (BK) to
neutral (W). If 115VAC is present on #2 (BR) and not on #3 (BK), replace control
switch. If 115VAC is present on control switch #3 (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 wire
connections and CT continuity. If open, replace CT.
b) HPS Diagnosis: Check that all shutoff valves (4 total) are open and 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: HGVs, strainer, or check valve.
Freeze Cycle: FMRs, TXV, HM, LLVs, strainer, check valve, drier, and damaged line
set or fitting.
c) DLT Diagnosis: Check that the condenser coil is not clogged or restricted. Let
discharge line thermostat cool, if DLT does not close, replace DLT. Once closed,
restart appliance, once Comp starts, check voltage and amp draw.
See "5a),a) Comp Diagnosis" below.
14
4) 1-Min. Fill Cycle – LED 4 is on. WV1 energizes. After 1 min., CB checks for a closed
FS. If FS is closed, the harvest cycle begins. If harvest cycle begins (Comp, HGVs,
and FMRs energized), continue to step 5a. If FS is open, WV1 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 WV1 does not energize, check for 115VAC at X10 relay terminal #6 (O)
to neutral (W) and X10 relay terminal #2 (W/O) to neutral (W). If 115VAC is present on
relay terminal #6 (O) and not on relay terminal #2 (W/O), check for 115VAC on
X10 relay terminal #8 (P) to neutral (W), if 115VAC is present replace CB. If 115VAC is
not present replace X10 relay. If 115VAC is present, and WV1 does not energize, check
for 115VAC at WV1. If 115VAC is present, check WV1 coil continuity. If open, replace
WV1. 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. WV1 continues. Comp, FMRs,
HGVs, WV2, X10 relay, X12 relay, and X13 relay energize. WV1 de-energizes. 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). WV2 and X12 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. X13 remains energized throughout harvest cycle to prevent DV
from energizing.
a) Comp Diagnosis: Check that evaporator is warming. If not, confirm that Comp
energizes. If not, check for 115VAC at CB K1 #1 (V) to neutral (W). If 115VAC is not
present, check for 115VAC at CB K1 #10 (BR) to neutral (W). If 115VAC is present
at #10 (BR) and not at #1 (V), replace CB. If 115VAC is present, check for 115VAC
at MC solenoid (SRK). If 115VAC not present, check wire harness connections.
If 115VAC is present, confirm contacts are closed. If not, replace MC. If MC contacts
are closed, check Comp start and run capacitors, start relay (single phase), and
Comp motor winding.
b) HGVs Diagnosis: If Comp is energized and evaporator is not warming, check that
HGVs energize and open. Check for 115VAC at CB K1 #2 (P) to neutral (W).
If 115VAC is not present, replace CB. If 115VAC is present, check for 115VAC at
HGVs coil (KMS and SRK) and check HGVs coils continuity. Replace as needed.
c) LLVs Diagnosis: Confirm that both LLVs are de-energized (KMS and SRK) and
closed (not bypassing). If energized, replace CB. If de-energized and bypassing,
replace LLVs (KMS and SRK).
15
d) Relays:
1. X10 (WV1 and WV2): If WV1 continues and WV2 does not energize, check for
115VAC between X10 relay terminal #4 (GY) to neutral (W) and X10 relay terminal
#2 (W/O) to neutral (W). If 115VAC is present at relay terminal #2 (W/O) and not
at relay terminal #4 (GY), check for 115VAC at relay terminal #8 (P). If 115 VAC is
present at relay terminal #8 (P) and not at relay terminal #4 (GY), replace relay.
If 115VAC is present at relay terminal #4 (GY) and not at relay terminal #2 (W/O)
and WV1 contines, clean or replace WV1.
2. X12 Relay (DV Lockout relay 1) and X13 Relay (DV Lockout relay 2):
If DV energizes (water flowing down the drain) check for 115VAC at X12 relay
terminal #8 (GY) to neutral (W). If 115VAC is not present see "d)1. X10 (WV1 and
WV2)" above. If 115VAC is present, check X12 relay terminal #6 (Y) to neutral (W)
and #4 (P) to neutral (W). If 115VAC is not present from X12 relay terminal #6 (Y)
to neutral (W), check for 115VAC on X10 relay terminal #5 (V) and relay terminal
#3 (Y) to neutral (W). If 115VAC is present on X10 relay terminal #5 (V) and not on
relay terminal #3 (Y) replace X10 relay. If 115VAC is present on relay terminal #6 (Y)
and not on X12 relay terminal #4 (P) replace X12 relay. If 115VAC is present on
X12 relay terminal #4 (P), check for 115 VAC at X13 relay terminal #8 (P) to neutral
(W). If 115VAC is present, check for 115VAC at X13 relay terminal #2 (W/BK) to
neutral (W). If 115VAC is present at X13 relay terminal #2 (W/BK), replace
X13 relay. If 115VAC is not present on X13 relay terminal #2 (W/BK) and water is
going down the drain, clean or replace DV.
3. X11 (DV/HPT relay): If PM energizes during initial harvest, check X11 relay
terminal #8 (DBU) to neutral (W). If 115VAC is present, and CB LED 3 is off, replace
CB. If 115VAC is not present, check for 115VAC at X11 terminal #6 (R) to neutral
(W). If 115VAC is present and CB LED 3 is off, replace X11 relay. Check X11 relay
terminal #5 (W/BU) to neutral (W). If 115VAC is present, check X11 relay terminal
#8 (DBU) to neutral (W). If 115VAC is present on X11 relay terminal #8 (DBU) and
CB LED 3 is off, replace CB.
16
5b) Harvest Pump Timer – 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 WV2 de-energizes, LED
4 turns off, X12 relay de-energizes. LED 3 turns on and X11 relay energizes, allowing
PM to energize. Comp, FMRs, HGVs, X10, and X13 relays 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 WV2 continues, check for 115VAC
at CB K1 #6 (O) to neutral (W). If 115VAC is present, and LED 4 is off, replace CB.
If 115VAC is not present, and WV2 continues, check WV2 diaphragm for leaking by.
Clean or replace. If LED 3 is on and PM is not energized, check for 115VAC at X11 relay
terminal #8 (DBU) to neutral (W). If 115VAC is not present at X11 terminal relay
#8 (DBU), replace CB. If 115VAC is present, check for 115VAC at X11 relay terminal
#4 (P) to neutral (W) and X11 relay terminal #6 (R). If 115VAC is present at X11 relay
terminal #4 (P) and not at X11 relay terminal #6 (R), replace X11 relay. If 115VAC is
present at X11 relay terminal #6 (R), check control switch contact continuity between
terminals #6 (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." Once harvest timer
terminates, LED 3 & 2 turn off and freeze cycle starts. 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.
17
6) Freeze Cycle – LED 1 is on. Comp, FMRs, and PM continue. LLVs energize.
HGVs, X10, X11, and X13 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 HPT to K1 #4 (R) in freeze.
Refill – LEDs 1 and 4 are on. The KMS‑1402MLJ uses a single F/S with a double F/S,
UF/S refill initiation float switch setting (S5 dip switch 1) and is set for 1 refill (S5 dip
switch 2 through 3). When the freeze cycle starts, CB monitors UF/S. No UF/S exists
on the KMS-1402MLJ, therefore CB reads an open UF/S signal when the freeze cycle
starts and immediately initiates a refill (CB energizes WV1 through X10 relay). Since
there is no UF/S to close and terminate the refill, the refill lasts for the maximum time of
1-minute. During the 1-minute refill, LED 4 is on. Comp, FMRs, LLVs, and PM continue.
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.
a) Freeze Cycle Diagnosis: Confirm Comp, FMRs, and PM continue. Confirm that
LLVs energize. Next, confirm HGVs, X10, X11, and X13 relays de-energize. During
the first 5 min. of freeze, confirm evaporator is cooling. If not, confirm that WV1 and
WV2 are de-energized (not leaking by), HGVs de-energized (not bypassing), LLVs
energize, TXV and HM operate correctly, Comp is efficient, and refrigerant charge is
correct. See "VIII.A. Specification and Performance Data Sheets."
b) Comp and FMRs Diagnosis: If Comp and FMRs de-energize once freeze begins,
check that appliance has not shut off on HPS or DLT ("POWER OK" LED off).
If so, check "3)b) HPS Diagnosis" or "3)c) DLT Diagnosis" above. If CB "POWER
OK" LED is on (KMS), check for 115VAC at CB K1 #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 MC coil (SRK). If 115VAC is not present, check wire harness connections. Next,
check for 115VAC at MC coil. If 115VAC is present, check MC coil and contacts
continuity. Replace as needed. Next, check Comp start relay, start and run capacitors
(single phase), and 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."
FMRs Diagnosis: If Comp is energized but FMRs are not, check for 115VAC at
MC terminal "NO" black (BK) wire to neutral (W). If 115VAC is not present, and
MC is energized replace MC. If 115VAC is present, check FMRs capacitors, motor
windings, and fan blades for binding.
c) WV1, WV2, and HGVs Diagnosis: WV1/WV2: If WV1or WV2 energized or
bypassing, check for 115VAC at CB K1 #6 (O) to neutral (W). If 115VAC is present
after PM energizes and LEDs 2 and 4 are off, replace CB. If 115VAC is not present,
clean or replace WV1 or WV2 (bypassing). HGVs: If HGVs did not de‑energize at the
end of harvest and LED 2 is off, check for 115VAC at CB K1 #2 (P) to neutral (W).
If 115VAC is present and LEDs 2 and 3 are off, replace CB. If 115VAC is not present,
replace (defective) HGVs.
18
d) PM Diagnosis: Confirm water is flowing over evaporator from PM and not WV1
or WV2. If PM de-energizes once freeze begins (except for anti-slush), 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 #6 (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) LLVs Diagnosis: If LLVs do not energize, check for 115VAC at CB K1 #3 (BK) to
neutral (W). If 115VAC is not present, replace CB. If 115VAC is present, check wire
harness, wiring connections, coil voltage and continuity. Replace as needed.
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) 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."
h) 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, WV1 and WV2
screens. If water tank empties before 5 min. timer terminates and freeze cycle is
short, check that DV is not bypassing or energized (water flowing through DV). If DV
is bypassing, remove and clean DV, replace as needed. If water tank is full, see "II.F.
Float Switch Check and Cleaning." for erratic operating FS.
19
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 FMRs continue, HGVs energize.
Note: If S4 dip switch 3 & 4 are set to 3 off and 4 on, LED 4 turns on and WV2 and X12
relay energize, energizing X13 relay. NOTICE! S4 dip switch 3 & 4 must not be set to
3 off and 4 on. Otherwise, LED 4 turns on energizing WV2, X12, and X13 relays.
Once X13 relay energizes, DV cannot energize.
LLVs de‑energize. PM stops for 2 sec., then restarts 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 cycle. For details, see "III.C.4. Pump‑Out
Frequency Control (S4 dip switch 5)."
a) 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 CB
LEDs 1, 3, and 2 are on, PM stops, then restarts, DV energizes, and water is flowing
down the drain through DV.
b) CB Diagnosis:
PM: If PM does not stop and restart, check that CB LEDs 1, 3, and 2 are on.
If not and pump-out is called for, replace CB. If LEDs 1, 3, and 2 are on, X11 relay
energizes. If not, check for 115VAC at CB K1 #5 (DBU) to neutral (W). If 115VAC is
not present, replace CB. If 115VAC is present at CB K1 #5 (DBU) and X11 relay is not
energized, continue to "c) PM Diagnosis:" below.
DV: If DV is not energized, check for 115VAC at CB K1 #1 (V) to neutral (W).
If LED 2 is on and 115VAC is not present at CB K1 #1 (V), replace CB. If 115VAC is
present at CB K1 #1 (V) to neutral (W), continue to "d) DV Diagnosis" below.
c) PM Diagnosis: If 115VAC is present at CB K1 #5 (DBU), X11 relay energizes. Check
for 115VAC at X11 relay #8 (DBU) to neutral (W). If 115VAC is not present, check
wiring connections from CB K1 #5 (DBU) to X11 relay #8 (DBU). If 115VAC is present
at X11 relay #8 (DBU) and PM does not restart, check for 115VAC at X11 relay
terminal #4 (P) and terminal #(6) to neutral (W). If 115VAC is present on #4 (P) and
not on #6 (R), replace X11 relay (sticking contacts). If 115VAC is present at X11 relay
#6 (R) and PM is de-energized, check for 115VAC at control switch
#6 (R) and #5 (W/R) to neutral (W). If 115VAC is present at #6 (R) and not at
#5 (W/R), replace control switch. If 115VAC is present at control #5 (W/R), check PM
capacitor, motor winding, wiring connections, and impeller for binding.
20
d) DV Diagnosis: X10 Relay: If 115VAC is present at CB K1 #1 (V) to neutral (W) and
DV is de‑energized, check for 115VAC at X10 relay #5 (V) and #3 (Y) to neutral (W).
If 115VAC is present at #5 (V) and not at #3 (Y), confirm X10 relay is de-energized.
If de-energized, replace X10 relay (sticking contacts). If energized, confirm
LEDs 1, 2, and 3 are on. If LED 1, 3, and 2 are on and X10 relay is energized,
replace CB.
X13 Relay: Next, If 115VAC is present at X10 #3 (Y) to neutral (W), check for 115VAC
at X13 #6 (Y) and #2 (W/BK) to neutral (W). If 115VAC is not present on #6 (Y),
check wiring from X10 relay #3 (Y). If 115VAC is present at X6 (Y) and not at
#2 (W/BK), confirm X13 is de-energized. If energized, confirm CB LEDs 1, 2, and
3 are on. If LEDs 1, 2, and 3 are on and X13 relay is energized, X12 relay must
be energized also. Replace CB. If 115VAC is present at X13 #2 (W/BK), check for
115VAC at X11 relay #3 (W/BK).
X11 Relay: Check for 115VAC at X11 relay #3 (W/BK). If 115VAC is not present check
wiring connections from X13 relay #2 (W/BK). If 115VAC is present at X11 #3 (W/
BK), check for 115VAC at X11 #5 (W/BU) to neutral (W). If 115VAC is present at X11
#3 (W/BK) and not at #5 (W/BU), confirm 115VAC from X11 relay #8 (DBU) to #7
(W). If 115VAC is present, replace X11 relay (sticking contacts). If 115VAC is present
at X11 relay #5 (W/BU) and DV is de‑energized, check wiring to DV from X11 relay
#5 (W/BU), DV coil continuity, make sure the drain line is not clogged and that DV is
clean and operating properly.
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
When the appliance is running, hold ice in contact with the thermostatic bulb. BC switch
opens within 10 sec., shutting down the appliance. BC is factory set, and generally
no adjustment is required. However, adjustment may be needed in some conditions,
particularly at higher altitude locations. Diagnosis: See "II.E. Bin Control Check." CB red
K4 connector must have the jumper in place. When the jumper is in place, the green "BC
CLOSED" LED remains on. If the jumper is not in place, yellow "BC OPEN" LED turns
on and the icemaker turns off and remains off until the jumper is replaced in its original
position.
3. Freeze-Time Correction Cycle Diagnosis
1) See "II.C. Freeze-Time Correction Cycle (90 min.).""
Legend: BC–bin control; CB–control board; Comp–compressor; CT–control transformer;
CV–cleaning valve; DV–drain valve; FMRs–fan motor remote;
FS–float switch; HGVs–hot gas valve; HM–headmaster (C.P.R.);
HPS–high-pressure switch; LLVs–liquid line valve; MC–magnetic contactor:
MT–main transformer; PM–pump motor; TXV–thermostatic expansion valve;
WV1–fill/re-fill water valve; WV2–harvest water valve
21
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 longest 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
22
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 WV2 (10‑min.) starts. Once
the final Harvest Pump Time (Harvest Assist) with WV2 (10-min.) terminates
(90 min. complete), normal freeze cycle begins.
2a) 10-Min. Harvest Pump Time (Harvest Assist) with WV2: CB "POWER OK" LED
blinking. CB LEDs 1, 4, 3, and 2 are on and Comp, FMRs, HGVs, PM, and WV2
energize. 10-min. timer starts. Once 10‑min. timer terminates, CB LEDs 1, 3, and 2 turn
off and Comp, FMRs, HGVs, WV2 and PM de-energize. WV1 energizes.
2b) 10-Min. Fill: CB LED 4 on and WV1 energized. 10-min. timer starts.
2c) Final 10-Min. Harvest Pump Time (Harvest Assist) with WV2: CB "POWER OK"
LED blinking. Once 10‑min. timer terminates, CB LEDs 1, 4, 3, and 2 are on and
Comp, FMRs, HGVs, PM and WV2 energize. 10-min. timer starts. Once 10-min. timer
terminates, normal freeze cycle begins. CB LED 1 on and Comp, FMRs, and PM
continue. HGVs and WV2 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; CT–control transformer;
CV–check valve; FMRs–fan motors remote; FS–float switch; HGVs–hot gas valves;
HM–headmaster (C.P.R.); HPS–high-pressure switch; LLVs–liquid line valves;
MC–magnetic contactor; PM–pump motor; TXV–thermostatic expansion valve;
WV1–fill/re-fill water valve; WV2–harvest water valve
23
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, 6, 7, 8, 9, 10 and S5 dip
switch 1 through 5 are in the factory default position. S4 dip switch 1, 2, and 5 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 "POWER OK" LED is on, control
voltage is good, continue to step 3. If the "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.I.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.
Control
Correct LED
Board Lighting Sequence
1, 4, 3, 2
Following the test, the icemaker begins operation at the 1-minute fill cycle for both.
If the LEDs do not light as described above, replace CB.
24
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.
5) Check CB control connectors K3, K4, and K5 for correct VDC per table below.
Note: Pin #1 is DC ground (GND) on each connector.
K3 Thermistor
K4 Bin Control
K5 Float Switch
Pin #
VDC
Pin #
VDC
Pin #
VDC
#1 to #2
5VDC
#1 to #2
5VDC
#1 to #2
1.2VDC
#1 to #3
5VDC
#1 to #3
5VDC
#1 to #3
2VDC
#2 to #3
0VDC
#2 to #3
0VDC
#2 to #3
1.2VDC
Legend: CB–control board; CT–control transformer
ALARM RESET
S3
1
3
Thermistor
3
Float Switch
1 2 3 4 5
6
ALP
X3
9
8
7
LED 4
C
5
4
3
X2
LED 3
2
1
K1
POWER
OK
RED
K5
S5
1
ON
BLACK
K4
1
Bin Control
LED 2
K6
P/N 2A3792-01
3
K7
K3
BC OPEN
BC CLOSED
ON
CB
WHITE
S4
1 2 3 4 5 6 7 8 9 10
S2
OUTPUT TEST
10
X4
LED 1
K2
2
3
X1
1
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.
4) Remove the base cover and clear any ice away from BC.
BC Connector
5) Disconnect BC connector from CB K4 connector.
6) Check for continuity across the wires of
Bin Control
BC connector. When the actuator paddle is Bracket
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.
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 dispenser unit/storage bin.
1) Turn off the power supply.
2) Remove the front panel, then move the
control switch to the "OFF" position.
To Control Board
K4 (red) Connector
3) Remove the top and right side panels.
Remove the control box cover, then clear
any ice away from BC.
Bin Control
4) Disconnect BC connector from CB K4
(red) connector, then remove BC from the
icemaker.
Proximity Switch
Actuator Paddle
5) Remove the actuator paddle from the
switch mount. See Fig. 2.
6) Wipe down BC with a mixture of 1 part
Hoshizaki "Scale Away" and 25 parts 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 Bin Control Proximity
Switch Closed
correct position.
8) Reconnect BC connector to CB K4 (red)
connector.
Bin Control
Proximity Switch
Open (bin full,
icemaker off or
shutting down)
(calling for ice)
9) Move the control switch to the "ICE"
position.
10) Replace the control box cover, right side,
top, and front panels in their correct
positions.
Switch Mount
11) Turn on the power supply to start the
automatic icemaking process.
Actuator Paddle
Magnet
Fig. 2
27
F. Float Switch Check and Cleaning
F/S is used to determine that there is sufficient water in the water tank after the 1‑minute
fill cycle and after each harvest cycle. F/S 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. Note: F/S is not part of refill operation.
1. Float Switch Check
To check F/S, follow the steps below.
1) Turn off the power supply.
2) Remove the front panel.
3) Place the control switch in the "SERVICE" position. Then place the service switch in the
"DRAIN" position.
4) Replace the front panel in its correct position, then turn on the power supply for
2 minutes.
5) Turn off the power supply.
6) Remove the front panel, then move the control switch to the "OFF" position.
7) Remove the top and right side panels.
8) Remove the control box cover, then disconnect F/S connector from CB K5 (black)
connector.
9) Check for continuity across F/S leads. With the water tank empty, F/S should be open.
If open, continue to step 10. If closed, follow the steps in "II.F.2. Float Switch Cleaning."
After cleaning F/S, check it again. Replace if necessary.
10) Reconnect F/S connector to CB K5 (black) connector, then replace the control box
cover, right side, and top panels in their correct positions.
11) Move the control switch to "ICE" position. Replace the front panel.
12) Turn on the power supply.
13) As water fills the water tank, F/S contacts should close. After 1 minute, the 1-minute fill
cycle should end and the initial harvest cycle should begin.
14) Once the harvest cycle starts, turn off the power supply.
15) Remove the front panel, then move the control switch to the "OFF" position.
16) Remove the top and right side panels.
17) Remove the control box cover, then disconnect F/S connector from CB K5 (black)
connector.
18) Check for continuity across F/S leads. With the water tank full, F/S should be closed.
If F/S is closed and the icemaker will not switch from the 1-minute fill cycle to the initial
harvest cycle, replace CB.
19) If open, confirm that the water tank is full. If the water tank is not full, check the water
supply, water filters, and fill/refill water valve. If the water tank is full, follow the steps in
"II.F.2. Float Switch Cleaning." After cleaning F/S, check it again. Replace if necessary.
28
20) Reconnect F/S connector to CB K5 (black) connector, then replace the control box
cover, right side, and top panels in their correct positions.
21) Move the control switch to the "ICE" position.
22) Replace the front panel in its correct position.
23) Turn on the power supply to start the automatic icemaking process.
Legend: CB–control board; F/S–float switch
2. Float Switch Cleaning
Depending on local water conditions, scale may build up on F/S. Scale can cause F/S to
stick. In this case, F/S should be cleaned.
1) Turn off the power supply.
2) Remove the front panel.
3) Place the control switch in the "SERVICE" position. Then place the service switch in the
"DRAIN" position.
4) Replace the front panel in its correct position, then turn on the power supply for
2 minutes.
5) Turn off the power supply.
6) Remove the front, top, and right side panels, then move the control switch to the "OFF"
position.
7) Disconnect the vent tube and the flush tube from the top of F/S housing, then remove
F/S assembly. Remove the rubber boot from the bottom of F/S assembly. See Fig. 3.
8) Remove the retainer rod from the bottom of F/S assembly, then remove the float. Be
careful not to bend the retainer rod excessively when removing it.
9) Wipe down F/S assembly's 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.
10) Reassemble F/S assembly and replace
it and the rubber boot in their correct
positions. Reconnect the vent tube and the
flush tube.
Flush Tube
Vent Tube
11) Replace the right side and top panels in
their correct positions.
12) Move the control switch to the "ICE"
position.
Shaft
Float Switch
Housing
13) Replace the front panel in its correct
position.
14) Turn on the power supply to start the
automatic icemaking process.
Fig. 3
Retainer Rod
Legend: CB–control board; F/S–float switch
Rubber Boot
and Hose
29
Float
G. Thermistor Check
To check thermistor resistance, 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 top and right side panels, then remove the control box cover.
4) Remove the thermistor.
5) Immerse the thermistor sensor portion in a glass containing ice and water for 2 or
3 minutes.
6) Disconnect the thermistor connector from CB K3 (white) connector and check
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 next step.
7) Replace the thermistor in its correct position. See "IV.B. Component Service
Information."
8) Reconnect the thermistor connector to CB K3 (white) connector.
9) Replace the control box cover, right side, and top panels in their correct positions.
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 minutes. If the
harvest cycle does not terminate within 2 to 5 minutes, replace CB.
Legend: CB–control board; Comp–compressor
Thermistor Lead
Foam Insulation
Fig. 4
30
Cable Tie
Thermistor Holder
H. Switches
Two control switches are used to control operation. These switches are referred to as the
control switch" and the "service switch" and are located on the control box.
1. Control Switch
The control switch has three positions: "OFF" for power off, "ICE" for icemaking, and
"SERVICE" to activate the service switch. WARNING! Moving control switch to "OFF"
position does not de-energize all components.
2. Service Switch
When the control switch is in the "SERVICE" position, the control switch supplies power
to the service switch and water pump. The machine is in service mode. The service
switch has three positions: "DRAIN, "CIRCULATE," and "WASH." See the information
below for details of each function.
Note:
1. When the service switch is activated, power is supplied to the water pump in all
three positions.
2. When the control switch is in the "OFF" position or in the "ICE" position, the
service switch has no power and can be left in any position.
a) DRAIN
This appliance utilizes a pump-out drain system. When the service switch is active and
placed in the "DRAIN" position, power is supplied to the drain valve.
b) CIRCULATE
When the service switch is active and placed in the "CIRCULATE" position, power is
supplied to the pump only. This operation can be used to circulate cleaner for extended
periods of time over the outside surface of the evaporator.
c) WASH
This appliance utilizes a solenoid operated wash (bypass) valve. When the service switch
is active and placed in the "WASH" position, power is supplied to the water pump and the
wash valve. This operation is used to circulate cleaner and sanitizer over both the inside
and outside of the evaporator.
31
I. Diagnostic Tables
Before consulting the diagnostic tables, check for correct installation, proper voltage per
nameplate, and adequate water pressure (10 to 113 PSIG). Check control board using the
steps in "II.D. Control Board Check."
1. No Ice Production
No Ice Production - Possible Cause
1. Power Supply
a) Off, blown fuse, or tripped breaker.
2. Main Transformer
(3 phase SRK)
(208-230VAC/115VAC)
a) Voltage tap switch not set to proper voltage.
3. Water Supply
a) Water supply off or improper water pressure.
b) Not within specifications.
b) No neutral. White (W) wire to ground 0VAC. (White (W) wire to
ground should be 60VAC).
b) External water filters clogged.
4. Fuse (SRK Control Box)
a) Blown.
5. High-Pressure Switch (SRK)
a) Dirty condenser.
b) Condensing unit fan(s) not operating.
c) Headmaster (C.P.R.) open.
d) Refrigerant overcharged.
e) Bad contacts.
f) Refrigerant lines or components plugged.
6. Discharge Line Thermostat
(SRK)
a) Ambient temperature too warm.
b) Compressor or compressor components defective.
c) Defective.
d) Hot gas valve(s) open.
e) Dirty condenser.
f) Condensing unit fan(s) not operating.
7. Wire Harness
(From SRK to KMS)
a) Disconnected or loose connection.
8. Fuse (KMS Control Box)
a) Blown.
9. Control Switch
a) In "SERVICE" or "OFF" position.
b) Bad contacts.
10. Control Transformer
(115VAC/10.5VAC)
a) Coil winding open or shorted.
11. Control Board
See "II.D. Control Board Check"
a) In alarm.
b) Yellow "BC OPEN" LED on: Bin full.
c) Defective.
12. Bin Control
See "II.E. Bin Control Check"
a) Tripped with bin filled with ice.
b) Actuator does not move freely.
c) Defective.
13. Fill/Refill (WV1) or
Harvest Water Valve (WV2)
a) Screen or orifice clogged.
b) Coil winding open.
c) Water valve open in freeze cycle.
32
No Ice Production - Possible Cause
14. Float Switch
a) Float does not move freely.
See "II.F. Float Switch Check and b) Defective.
Cleaning"
15. Compressor
a) Magnetic contactor contacts bad or coil winding open.
b) Start capacitor or run capacitor defective (1 phase SRK).
c) Start relay contacts bad or coil winding open
(1 phase SRK).
d) Internal protector open.
e) Compressor defective.
16. Hot Gas Valves (KMS & SRK)
a) Closed in harvest cycle.
b) Open in freeze cycle.
17. Thermistor
See "II.G. Thermistor Check"
a) Loose, disconnected, or defective.
18. Pump Motor
a) Motor winding open.
b) Bearing worn out or locked rotor.
c) Defective capacitor.
19. Thermostatic Expansion Valve
a) Bulb loose.
b) Operating erratically.
20. Liquid Line Valves (KMS & SRK) a) Closed in freeze cycle.
b) Open in harvest cycle.
21. Fan Motors-Remote
a) Motor winding open.
b) Bearing worn out or locked rotor.
c) Defective capacitor.
22. Headmaster
a) Defective.
23. Water System
a) Water leaks causing short freeze time.
33
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, Spray Guides, and a) Dirty.
Splash Guard or Splash Curtain b) Out of position.
4. Water Supply
a) Low water pressure.
b) External water filters clogged.
c) Insufficient water line size.
Minimum 3/8" nominal ID copper water tubing or equivalent.
5. Harvest Water Valve (WV2)
a) Defective.
6. Float Switch
a) Float does not move freely.
See "II.F. Float Switch Check and b) Defective.
Cleaning"
7. Refrigerant Charge
a) Low.
8. Control Board
See "III. Controls and
Adjustments" and "II.D. Control
Board Check"
a) Harvest timer (S4 dip switch 1 & 2) set too short.
9. Bin Control
See "II.E. Bin Control Check"
a) Bulb out of position.
b) Harvest pump timer (S4 dip switch 7) not in factory default position.
c) Defective.
b) Defective.
10. Thermistor
See "II.G. Thermistor Check"
a) Loose, disconnected, or defective.
11. Thermostatic Expansion Valve
a) Defective.
12. Hot Gas Valves (KMS & SRK)
a) Closed or restricted.
13. Liquid Line Valves (KMS & SRK) a) Open.
Freeze Cycle
1. Evaporator
a) Scaled up.
b) Damaged.
2. Spray Tubes, Spray Guides, and a) Dirty.
Splash Guard or Splash Curtain b) Out of position.
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. Fill/Refill (WV1) or
Harvest Water Valve (WV2)
a) Leaking by.
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.
34
Freeze-Up - Possible Cause
8. Thermostatic Expansion Valve
a) Bulb loose or defective.
9. Headmaster
a) Defective.
10. Liquid Line Valves (KMS & SRK) a) Restricted.
3. Low Ice Production
Low Ice Production - Possible Cause
Long Harvest Cycle
1. Evaporator
a) Scaled up.
2. Spray Tubes, Spray Guides, and a) Dirty.
Splash Guard or Splash Curtain b) Out of position.
3. Refrigerant Charge
a) Low.
4. Water Supply
a) Low water pressure.
b) External water filters clogged.
c) Insufficient water line size.
Minimum 3/8" nominal ID copper 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 Valves (KMS & SRK)
a) Erratic or closed.
8. Harvest Water Valve (WV2)
a) Screen or orifice clogged.
9. Compressor
a) Inefficient or off.
b) Defective.
10. Liquid Line Valves (KMS & SRK) a) Erratic or open.
11. Thermostatic Expansion Valve
(TXV)
a) Defective.
12. Headmaster
a) Defective.
Long Freeze Cycle
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. Fill/Refill (WV1) or
Harvest Water Valve (WV2)
a) Leaking by.
4. Hot Gas Valves (KMS & SRK)
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
(TXV)
a) Bulb loose.
9. Compressor
10. Pump Motor
b) Defective.
b) Defective.
a) Inefficient or off.
a) RPM too slow.
11. Liquid Line Valves (KMS & SRK) a) Erratic or restricted.
12. Headmaster
a) Defective.
35
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 Operation
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
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
Fill
YES NO
[ ]
[ ]
4) Is the appliance stacked?
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) Does the water tank fill and overflow?
60-90 sec. Note: Larger models may take up to
120 seconds to overflow when empty.
18) If NO in step 17, is water flow 5GPM for larger?
19) Does the appliance utilize re-fill (S5 dip switch
2 and 3)?
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?
Freeze-Time Correction Operation
[ ]
[ ] 34) Has Freeze-Time Correction been activated?
("POWER OK" LED blinking).
[ ]
[ ] 35) Has more than 1 Freeze-Time Correction been
activated?
(POWER OK" LED and "EXT HARVEST" LED
blinking).
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
36
III. Settings and Adjustments
• A Hoshizaki exclusive control board is employed in the Hoshizaki icemakers.
• All models are pretested and factory adjusted.
• For a control board check procedure, see "II.D. 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 terminals.
• Do not short out power supply to test for voltage.
• Always replace the whole control board assembly if it goes bad.
37
A. Control Board Layout
"J" Control Board
• Bin Control Switch
Closed LED (green)
• "ALARM RESET" Button
• S4 Dip Switch
• K3 (white) Connector
Thermistor
(harvest control and
high temperature safety)
• Bin Control Switch
Open LED (yellow)
• Alarm Buzzer
• K4 (red) Connector
Bin Control
• Ext. Harvest
LED (yellow)
(blinks when
3rd occurrence
of freeze time
correction initiates
within 36 hr.)
• S5 Dip Switch
• 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 Magnetic Contactor, X13 Relay
#2 Hot Gas Valves, X10 Relay
#3 Liquid Line Valves
#4 Pump Motor
#5 X11 Relay
(harvest pump timer and
pump-out)
#6 Fill/Refill water valve (WV1),
Harvest water valve (WV2),
X12 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
• "OUTPUT TEST" Button
(used to test relays on control board)
• K2 Connector
Control Transformer
(10.5VAC)
"J" Control Board
Part Number 2A7664-02
38
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
Energized
Components
LED
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*, FMRs, HGVs, WV1/WV2
Comp, FM*, FMRs, HGVs, PM
1 minute 20 minutes
0 seconds 50 seconds
1
Comp, FM/FMRs, PM, LLV
5 minutes
Anti-Slush Control
1, 3
Comp, FM/FMRs, LLV
Pump-Out Cycle
1, 4†, 3, 2 Comp, FM*, FMRs, WV †, PM, HGVs, DV
*FM energized if on K1 Connector 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
High Evaporator Temp.
(temperature > 127°F) (53°C)
Harvest Backup Timer
(harvest > 20 min. for two
cycles in a row)
Freeze Timer
(freeze > freeze timer setting
for two cycles in a row)
Freeze-Time Correction
(maximum freeze time
differential exceeded)
Notes
Check for harvest problem (stuck HGV or relay), hot
water entering unit, stuck HM, or shorted thermistor.
Check thermistor (open), HGV not opening,
TXV or LLV leaking by, low charge, inefficient Comp,
or WRV leaking by.
3
Check FS stuck closed (up), WV leaking by, HGV leaking
Beep
by, PM not pumping, TXV defective, LLV not opening, low
charge, HM not bypassing, or inefficient Comp.
LED Blink
RED POWER OK LED blinks.
After 3rd freeze‑time correction cycle in 36 hours starts
CB yellow "EXT HARVEST" LED blinking.
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;
WV1–fill/re-fill water valve; WV2–harvest water valve
Test
To perform output test, move control switch to "ICE" position. Press "OUTPUT TEST" button.
Correct green LED lighting sequence is 1, 4, 3, 2. Components (e.g., compressor) cycle
during test. Following test, icemaker resumes operation.
Dip switches must be adjusted per unit’s service manual or Hoshizaki Technical Support
recommendation. S4 dip switch 8 must remain off.
39
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 Hoshizaki
Technical Support at 1-800-233-1940.
1. Default Dip Switch Settings
The dip switches are factory-adjusted to the following positions:
S4 Dip Switch
Dip Switch No.
KMS-1402MLJ\3
1
2
3
4
OFF OFF OFF ON
5
6
ON
ON
7
8
9
10
ON OFF OFF OFF
S5 Dip Switch (Do Not Adjust)
1
2
KMS-1402MLJ/3 ON
3
4
5
ON OFF OFF OFF
Freeze Timer (9 & 10)
Factory Use (8)
Harvest Pump Time (Harvest Assist)/Freeze-Time Correction (7)
(Do Not Adjust)
Harvest Pump Time (Harvest Assist Duration) (6)
(Do Not Adjust)
Pump-Out Frequency Control (5)
Pump-Out Time/Harvest Time During Pump-Out (3 & 4)
Harvest Time (1 & 2)
S5 Dip Switch
Do Not Adjust
Anti-Slush (5)
1 2 3 4 5
ON
1 2 3 4 5 6 7 8 9 10
S4 Dip Switch
ON
Dip Switch No.
Minimum Harvest Time (4)
Refill Counter (2 and 3)
Float Switch Selector (1)
40
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. Drain valve does not energize in this setting.
When a pump-out is called for, the pump motor stops for 2 sec. After 2 sec. the drain
valve and pump motor energize. Water is removed from the bottom of the water tank
and sent down the drain. The pump‑out 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 timer control can be
set to pump-out for 10 or 20 sec.
S4 Dip Switch Setting
Time (sec.)
T1
No. 3
No. 4
OFF
OFF
ON
Fill/Refill 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
41
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 Duration) (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 duration) is controlled by S4 dip switch 6 and S5 dip
switch 4. See table below. Harvest pump time (harvest assist duration) is only active
when S4 dip switch 7 is in the "ON" position. In the factory default position, the harvest
pump time (harvest assist duration) starts with 50 sec. left to go in harvest cycle
(S4 dip switch 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 duration) is factory set, and no adjustment is required.
S4 Dip Switch Setting
Harvest Pump Time
(Harvest Assist)
No. 6
S5-4 OFF
S5-4 ON
OFF
50 sec.
25 sec.
ON
25 sec.
15 sec.
42
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) Depending on the harvest pump timer setting, the pump motor either stays off or is
energized the last 50 seconds of harvest. When the pump motor is energized, water
circulates over the evaporator. The harvest water valve (WV2) and X12 relay are
energized during harvest for a maximum of 6 minutes or the length of harvest minus
0 or 50 seconds (determined by the harvest pump timer setting), whichever is shorter.
When S4 dip switch 7 is in the on position and harvest begins, X10 relay energizes and
allows the harvest water valve (WV2), X12, and X13 relays to energize. A lockout circuit is
created using the X10, X12, and X13 relays. This prevents the drain valve from energizing
during harvest pump timer. See "VIII.B. Wiring Diagram."
50 seconds before harvest termination, LED 4 goes off de‑energizing WV2 (harvest
water valve) and X12 relay. X13 relay remains energized through the holding circuit
through X10 and X13 relays. Next, LED 3 on the control board turns on and X11 relay
energizes, allowing the pump motor to energize. The pump motor is energized the last
50 seconds of harvest.
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
No. 7
Harvest Pump
Time (sec.)
(Harvest Assist)
Freeze-Time
Correction
OFF
0
Disabled
ON
50
Enabled
7. Factory Use (S4 dip switch 8)
Factory set for proper operation. Do not adjust. This must be left in the factory default
position.
43
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.I.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 Control Selector (S5 dip switch 1)
NOTICE
Do not adjust. This must be left in the factory default position or the icemaker will
not operate correctly.
Float switch selector used in applications where refill is required in the freeze cycle.
Refills set by S5 dip switch 2 and 3. Note: In single float switch with upper float operation
only 1 refill allowed. (reword).
• Single float switch application:
• With S5 dip switch 1 in the "OFF" position, control board monitors the lower float switch for
refill operation.
• With S5 dip switch 1 in the "ON" position, the control board monitors the upper float switch
for refill operation. In this case no upper float switch exists, therefore the control board
reads an open upper float switch immediately when the freeze cycle starts and initiates a
refill. Since there is no upper float switch to close and terminate the refill, the refill lasts for
a maximum of 1-min. During the 1-min. refill, LED 4 is on.
• Double float switch application: Float switch control selector determines which float
switch (upper or lower) the control board monitors for refill control during the freeze
cycle.
S5 Dip Switch Setting
No. 1
Upper or Lower Float Switch
Control
OFF
Lower Float Switch Enabled
ON
Upper Float Switch Enabled
(this setting is ignored if refill counter
(S5 dip switch 2 and 3) set to 0)
44
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.
The refill counter determines the number of refills. The KMS‑1122MLH does not refill
during the freeze cycle.
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
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)
NOTICE
Factory set for proper operation. Do not adjust. Adjustment outside the factory
default setting may result in damage to the appliance.
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 ice slush and
prevent ice slush from blocking the water supply tubing, causing irregular freeze patterns.
S5 Dip Switch Setting
No. 5
Anti-Slush
OFF
Disabled
ON
Enabled
45
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 condensing unit and icemaker are provided with refrigerant shutoff valves. Using
proper refrigerant practices, recover the refrigerant. Recovery via the condensing unit's
refrigerant shutoff valves is recommended. Store the refrigerant in an approved container.
Do not discharge the refrigerant into the atmosphere.
46
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)
The condensing unit and icemaker are provided with refrigerant shutoff valves.
Evacuation and recharge via the condensing unit's refrigerant shutoff valves is
recommended.
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.
47
4) Close the low-side valve and high-side valve on the gauge manifold.
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.
48
B. Component Service Information
NOTICE
When replacing a component listed below, see the notes to help ensure proper
operation.
Component
Notes
Compressor
1 Phase SRK: Install a new start capacitor, run capacitor, and start relay.
3 Phase SRK: Install a new magnetic contactor.
Thermostatic
Expansion
Valves
• Attach the thermostatic expansion valve bulb to the suction line in the same location as
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.
49
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.
Wipe down with a clean cloth and warm water.
Underside of
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 "SERVICE" 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) Turn off the power supply, then remove the front panel.
2) Move the control switch to the "OFF" position. Confirm that the service switch is in the
"CIRC." position.
3) Remove the front insulation, front frame, right side panel, and control box cover.
4) Disconnect the thermistor connector from the control board K3 (white) connector, then
unplug the water pump connector at the water pump.
5) Wait 3 minutes, then move the control switch to the "ICE" position. Confirm that the bin
control switch is closed and calling for ice. The green "BC CLOSED" LED on the control
board should be on.
6) Once LED 1 and 2 on the control board energize (the order of the LEDs from the outer
edge of the control board is 1, 4, 3, 2), close the inlet water supply line shut-off valve
and open the inlet water supply line drain valve. Allow the line to drain by gravity.
7) Disconnect the harvest water valve (WV2) hose in the evaporator section and blow out
the water line to the harvest water valve (WV2) using compressed air or carbon dioxide.
See Fig. 5. This will clear water from the harvest water valve (WV2).
8) Move the control switch to the "OFF" position.
9) Move the service switch to the "WASH" position and the control switch to the
"SERVICE" position.
10) Using the same hose as with the harvest water valve (WV2), blow out the wash valve
using compressed air or carbon dioxide.
11) Move the service switch to the "CIRC." position and the control switch to the "OFF"
position.
12) Remove the 4 hoses connected to the water tank. Allow the water tank and hoses to
completely drain.
13) Move the control switch to the "ICE" position.
14) Using the fill/refill water valve (WV1) hose, blow out the water line using compressed air
or carbon dioxide. This will clear water from the fill/refill water valve (WV1).
15) Move the control switch to the "OFF" position.
16) Disconnect the float switch flush tube from the drain hose tee. Move the service switch
to the "DRAIN" position and the control switch to the "SERVICE" position.
51
17) From the tee on the drain hose, blow out the drain valve using compressed air or carbon
dioxide.
18) Move the service switch to the "CIRC." position and the control switch to the "OFF"
position.
19) Turn off the power supply.
20) Reconnect the thermistor connector to the control board K3 (white) connector.
Reconnect the water pump connector.
21) Close the inlet water supply line drain valve.
22) Remove all ice from the dispenser unit/storage bin and clean the dispenser unit/storage
bin liner using a neutral cleaner. Rinse thoroughly after cleaning.
23) Replace all removed parts and panels in their correct positions.
Harvest Water Valve Hose
Harvest Water Valve (WV2)
Wash Valve
Fill/Refill Water Valve Hose
Fill/Refill Water Valve (WV1)
Float Switch Flush Tube
Drain Valve
Drain Hose Tee
Suction Hose
Fig. 5
52
VII. Disposal
This 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. KMS-1402MLJ with SRK-15J
Specification Sheet
AC SUPPLY VOLTAGE
ELECTRIC & WATER CONSUMPTION
ELECTRIC W (kWH/100 lbs.)
WATER gal./24HR (gal./100 lbs.)
ICE PRODUCTION PER CYCLE
BIN CONTROL SYSTEM
REFRIGERANT CHARGE
115VAC Supplied by SRK-15J via Factory Supplied
Wire Harness
90/70°F
70/50°F
2510 (4.30)
2310 (3.70)
294 (21.0)
642 (42.8)
26.4 lbs. (12 kg) 1248pcs.
Mechanical Lever Switch
TOTAL R404A, 16 lb. 5 oz. (7400g)
ICEMAKER, 0 lb. 7.1 oz. (200g)
CONDENSER, 15 lb. 14 oz. (7200g)
Performance Sheet
APPROXIMATE ICE PRODUCTION PER 24
HR.
AMBIENT
TEMP. (ºF/ºC)
70/21
80/27
90/32
lbs./day kg./day
100/38
APPROXIMATE ELECTRIC CONSUMPTION
70/21
80/27
90/32
watts
100/38
APPROXIMATE WATER CONSUMPTION
70/21
PER 24 HR.
80/27
90/32
gal./day m3/day
100/38
FREEZING CYCLE TIME
70/21
80/27
90/32
min.
100/38
HARVEST CYCLE TIME
70/21
80/27
90/32
min.
100/38
HEAD PRESSURE
70/21
80/27
90/32
PSIG kg/cm2G
100/38
SUCTION PRESSURE
70/21
80/27
90/32
PSIG kg/cm2G
100/38
50/10
1501
1478
1471
1421
681
671
667
644
2310
2355
2369
2362
642
565
540
716
2.43
2.14
2.05
2.71
22
23
23
24
4.4
3.9
3.8
3.1
183
196
200
200
45
46
46
46
12.9
13.8
14.0
14.1
3.2
3.2
3.2
3.3
TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR
CONDENSER VOLUME
WATER TEMP. (ºF/ºC)
70/21
1471
667
1432
650
1400
635
1365
619
2369
2446
2510
2516
540
2.05
406
1.54
294
1.11
504
1.91
23
24
26
26
3.8
3.1
2.4
2.4
200
14.0
222
15.6
240
16.9
243
17.1
46
3.2
47
3.3
48
3.4
48
3.4
90/32
1352
1269
1253
1117
613
576
568
507
2407
2461
2536
2560
1175
1471
1190
2014
4.45
5.57
4.51
7.62
25
27
28
30
3.5
3.0
2.2
2.0
215
233
254
266
48
49
50
52
28,400 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
3,500 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
226 CU. IN (SRK-15J)
54
15.1
16.4
17.8
18.7
3.4
3.5
3.5
3.7
2. KMS-1402MLJ with SRK-15J3
Specification Sheet
AC SUPPLY VOLTAGE
ELECTRIC & WATER CONSUMPTION
ELECTRIC W (kWH/100 lbs.)
WATER gal./24HR (gal./100 lbs.)
ICE PRODUCTION PER CYCLE
BIN CONTROL SYSTEM
REFRIGERANT CHARGE
115VAC Supplied by SRK-15J3 via Factory Supplied
Wire Harness
90/70°F
70/50°F
2510 (4.55)
2340 (3.81)
292 (22.0)
725 (49.2)
26.4 lbs. (12 kg) 1248pcs.
Mechanical Lever Switch
TOTAL R404A, 16 lb. 5 oz. (7400g)
ICEMAKER, 0 lb. 7.1 oz. (200g)
CONDENSER, 15 lb. 14 oz. (7200g)
Performance Sheet
APPROXIMATE ICE PRODUCTION PER 24
HR.
AMBIENT
TEMP. (ºF/ºC)
70/21
80/27
90/32
lbs./day kg./day
100/38
APPROXIMATE ELECTRIC CONSUMPTION
70/21
80/27
90/32
watts
100/38
APPROXIMATE WATER CONSUMPTION
70/21
PER 24 HR.
80/27
90/32
gal./day m3/day
100/38
FREEZING CYCLE TIME
70/21
80/27
90/32
min.
100/38
HARVEST CYCLE TIME
70/21
80/27
90/32
min.
100/38
HEAD PRESSURE
70/21
80/27
90/32
PSIG kg/cm 2G
100/38
SUCTION PRESSURE
70/21
80/27
90/32
PSIG kg/cm 2G
100/38
50/10
1474
1441
1430
1399
669
654
649
635
2340
2378
2390
2388
725
628
598
449
2.75
2.38
2.26
1.70
22
23
23
24
4.8
4.2
4.0
3.2
186
199
203
203
45
46
46
46
13.1
14.0
14.3
14.3
3.2
3.2
3.3
3.3
WATER TEMP. (ºF/ºC)
70/21
1430
649
1373
623
1325
601
1300
589
2390
2455
2510
2517
598
2.26
431
1.63
292
1.10
281
1.06
23
25
26
27
4.0
3.1
2.3
2.2
203
14.3
225
15.8
244
17.2
247
17.3
46
3.3
48
3.4
50
3.5
50
3.5
90/32
1335
1258
1217
1117
606
571
552
507
2429
2479
2541
2570
523
410
246
204
1.98
1.55
0.93
0.77
25
27
28
30
3.7
3.1
2.1
2.0
217
234
255
266
48
49
51
52
15.3
16.5
18.0
18.7
3.4
3.5
3.6
3.7
28,000 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
3,500 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
226 CU. IN (SRK-15J3)
TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR
CONDENSER VOLUME
55
ENG.F-011.1.0205
3. SRK-15J
Specification Sheet
AC SUPPLY VOLTAGE
AMPERAGE
MINIMUM CIRCUIT AMPACITY
MAXIMUM FUSE SIZE
EXTERIOR DIMENSIONS (WxDxH)
DIMENSIONS INCLUDING LEGS (WxDxH)
EXTERIOR FINISH
WEIGHT
CONNECTIONS - ELECTRIC
- REFRIGERATION
CIRCUIT
COMPRESSOR
CONDENSER
COMPRESSOR PROTECTION
FAN MOTOR PROTECTION
REFRIGERANT CIRCUIT PROTECTION
REFRIGERANT CONTROL
REFRIGERANT CHARGE
DESIGN PRESSURE
OPERATING CONDITIONS
ACCESSORIES -SUPPLIED
-REQUIRED
208-230/60/1 ( 3 wire with neutral for 115V )
(115VAC Supplied to KMS via Factory Wire Harness)
11.3 A ( 5 Min. Freeze AT 104°F / WT 80°F )
20 A
20 A
50-1/4" x 17" x 28" (1274 x 432 x 712 mm)
50-1/4" x 17" x 43" (1274 x 432 x 1092 mm)
Galvanized steel
Net 230 lbs. (104 kg), Shipping 275 lbs. (125 kg)
Main Power Supply: Permanent Connection
SRK to KMS: Wire Harness Connection
Suction line - 5/8" Brazed Connections
Liquid line - 1/2" Brazed Connections
Hermetic, Model CS16K6E-PFV
Air Cooled, Fin and Tube Type
Auto-Reset Overload Protector (Internal)
Thermal Protection
Auto-Reset High-Pressure Switch
Condensing Pressure Regulator
TOTAL R404A, 16 lb. 5 oz. (7400g)
ICEMAKER, 0 lb. 7.1 oz. (200g)
CONDENSER, 15 lb. 14 oz. (7200g)
High 467 PSIG, Low 230 PSIG
VOLTAGE RANGE
AMBIENT TEMP. (Outdoor use)
Legs and hardware
187-253VAC
-20-122°F
Compatible KMS icemaker, Water Filter (2) cartridge, Ice Dispenser or Ice Storage Bin
Line set HS-0250, HS-0244, HS-0245
TOTAL HEAT OF REJECTION FROM CONDENSER
28,400 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
TOTAL HEAT OF REJECTION FROM COMPRESSOR
3,500 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
CONDENSER VOLUME
226 CU. IN.
ENG.F-032.1.0205
56
4. SRK-15J3
Specification Sheet
AC SUPPLY VOLTAGE
AMPERAGE
MINIMUM CIRCUIT AMPACITY
MAXIMUM FUSE SIZE
EXTERIOR DIMENSIONS (WxDxH)
DIMENSIONS INCLUDING LEGS (WxDxH)
EXTERIOR FINISH
WEIGHT
CONNECTIONS - ELECTRIC
- REFRIGERATION
CIRCUIT
COMPRESSOR
CONDENSER
COMPRESSOR PROTECTION
FAN MOTOR PROTECTION
REFRIGERANT CIRCUIT PROTECTION
REFRIGERANT CONTROL
REFRIGERANT CHARGE
DESIGN PRESSURE
OPERATING CONDITIONS
ACCESSORIES -SUPPLIED
-REQUIRED
208-230/60/3
(115VAC Supplied to KMS via Factory Wire Harness)
9.2 A ( 5 Min. Freeze AT 104°F / WT 80°F )
20 A
20 A
50-1/4" x 17" x 28" (1274 x 432 x 712 mm)
50-1/4" x 17" x 43" (1274 x 432 x 1092 mm)
Galvanized steel
Net 230 lbs. (104 kg), Shipping 275 lbs. (125 kg)
Main Power Supply: Permanent Connection
SRK to KMS: Wire Harness Connection
Suction line - 5/8" Brazed Connections
Liquid line - 1/2" Brazed Connections
Hermetic, Model CS16K6E-TF5
Air Cooled, Fin and Tube Type
Auto-Reset Overload Protector (Internal)
Thermal Protection
Auto-Reset High-Pressure Switch
Condensing Pressure Regulator
TOTAL R404A, 16 lb. 5 oz. (7400g)
ICEMAKER, 0 lb. 7.1 oz. (200g)
CONDENSER, 15 lb. 14 oz. (7200g)
High 467 PSIG, Low 230 PSIG
VOLTAGE RANGE
AMBIENT TEMP. (Outdoor use)
Legs and hardware
187-253VAC
-20-122°F
Compatible KMS icemaker, Water Filter (2) cartridge, Ice Dispenser or Ice Storage Bin
Line set HS-0250, HS-0244, HS-0245
TOTAL HEAT OF REJECTION FROM CONDENSER
28,000 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
TOTAL HEAT OF REJECTION FROM COMPRESSOR
3,500 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
CONDENSER VOLUME
226 CU. IN.
ENG.F-032.1.0205
57
58
V
V
P
P
BK
BK
Wire Color Code:
BK-black
BR-brown
GR-green
P-pink
V-violet
W-white
W GR
GR
GND
Legend:
GND-ground
HGV-hot gas valve
CB-control board
LLV-liquid line valve
L2-single phase power supply
L3-three phase power supply
Neutral
W
HGV LLV
Contactor
Fuse 10A
BR
BR
SRK Condensing Unit
(field connected)
GND
V
CB
BR
Fuse 10A
BR
GR
V
P
P
HGV
KMS Icemaker Unit
(factory connected)
Wire Harness Connections
LLV
BK
BK
W
Neutral
W
B. Wiring Diagrams
1. Wire Harness Connections
59
BR
L3
L1
L2
W
W
C1
W/BK COM
BK
BR
BR
C2
T1
(BK)
V
W
W
W/BR
W
W
W/BU
W
3
W/BU
W/BU
BK
BK
W
Y
Y
BK
2 GY
5
(R)
V
W/BU
R
COMP.
C
Y
W
(Y)
W
BK
(R)
V
P
Y
GY
W
W
9
W
GY
GY
GND
10
7
BK
5
3
1
BR
BK
BK
BK
W
W/O
W
Y
W/BU
W/BK
W
W
1 3 5 7
W
W
Y
W
W/BK W
W/BU
W/BR
GY
W
P
P
P
W
W
BK
P
V
BR
R
R
P
DBU
R
DBU
W/BR
W/O
W
5
Y
X11
W
(BK)
(R)
(D/BU)
PUMP
W/R
R
D/BU
CAP. W/R
10MFD
4
OFF
R
R
W
Y
CONTROL
SW.
OFF
1
W/BR
W/BR
W/O
BR
426± 0 PSIG
341±22 PSIG
Cut-in
22
BK
BK
2
R
BR
BR
BR
OFF
No.4
ON
No.4
ICE SERVICE
6
GY
DBU
P
OFF
No.3
OFF
No.3
* High-Pressure Switch
W
BR
SERVICE
GY
BR
FUSE 10A
ON
No.2
OFF
No.2
Cut-out
W
Y
W/BU
1 3 5 7
W/BK
(WV1)
DBU
P R
FILL/
RE-FILL
WATER VALVE 2 4 6 8
W/O
GND
10
9
7
BK
W
GR
5
3
1
P
V
BR
TERMINAL BLOCK
ON
WIRING
HARNESS
No.1
KMS-1402MLJ
OFF
KMS-1402MLJ
S5 DIP SWITCH SETTING
No.1
S4 DIP SWITCH SETTING
X10 WV1 AND WV2 RELAY
X11 DRAIN VALVE/HARVEST PUMP TIMER RELAY
X12 DRAIN VALVE LOCKOUT RELAY 1
X13 DRAIN VALVE LOCKOUT RELAY 2
P
GY (WV2)
P Y GY
HARVEST
2 4 6 8 X12 WATER VALVE
W/BR
W
(Y)
BR
BK
BR
TERMINAL BLOCK
GY
HOT GAS HOT GAS LINE
VALVE
VALVE VALVE
P
BR
35 MFD
P
Y P
4 6 8 X13
P
Y
W
(Y)
(R)
BK
1 3 5 7
W
W/BK
2
W
(W)
W/BK
W
W
FAN
(BK)
Y
**
DISCHARGE
THERMOSTAT
CAP.
START RELAY R RUN
CAP.
10MFD
BR
W/BU
DRAIN
VALVE
1
1
(W) BR
V
BR
R
DRAIN
CIRC
W/BR
W
W
O
FAN
(BK)
BK
CAP.
10MFD
BR
BR
R
W
V
V
WASH
HIPRESS.
START CAP.
189-227MFD
BR
SERVICE
SWITCH 2
GY
WASH
VALVE
W
(BK)
CRANKCASE
HEATER
W
W
R
BK
NO BK
NC GY
T2
T3
FUSE 10A
MAGNETIC CONTACTOR
WIRE COLOR CODE
BK -BLACK
BR -BROWN
DBU -DARK BLUE
GR -GREEN
GY -GRAY
O -ORANGE
P -PINK
R -RED
V -VIOLET
W -WHITE
Y -YELLOW
W/BR -WHITE/BROWN
W/R -WHITE/RED
W/BK -WHITE/BLACK
W/O -WHITE/ORANGE
W/BU -WHITE/BLUE
W
W
BK
W
BR
GND
*
BK
L1 N L2
BK W BR
208-230/60/3
SRK (1 PHASE)
3
BK
ICE
BK
O
O
P
P
6 8
W
V
R
BK
V
V
V
V
(BK)
R
R
V
HOT GAS V
VALVE
P
R
W (BR)
(Y)
(R)
P
DBU
BR
FLOAT SW.
P
(BK)
BIN CONTROL
R
R
R
R
V
O
BR
V
BR
(R)
(BK)
BK
BK
(O)
(O)
** Thermostat Switch
Y
W
1 3 5 7
Y V
2 4
P
O
V
(BK)
OFF
THERMISTOR
OFF
No.9 No.10
1
2
3
1
3
2
6
5
4
7
9
8
10
3
2
1
1
2
3
1
2
3
2A8704-012
K2
K1
K5
BLACK
K4
RED
K3
WHITE
CONTROL
BOARD
Cut-in
239°F±9°F (115°C±5°C)
Cut-out 266°F±9°F (130°C± 5°C)
W
(Y)
GY
P
P
OFF
No.8
W/O GY O P
W/O
X10
VALVE
BK
W/O
BR
BR
BR
ON
No.7
V
W/O
R
DBU
P
V
V
ON
No.6
(R) LINE
R
BK
GY
BK
BK
P
BR
V
OFF
No.5
ON
No.5
2. KMS-1402MLJ with SRK-15J
115V
BR
W
208V 0V
BK
VOLTAGE
TAP SW.
BR
W/BK
L1
L2
L3
BR
W
C1
W
(BK)
V
W
W
W
60
W/BR
W/BR
W
BR W
W
W
V
V
3
WASH
W
W
W/BU
W/BU
DRAIN
VALVE
W/BU
W/BU
DRAIN
1
V
BR
Y
Y
Y
Y
P
(R)
R
Y
W
(Y)
W/BU
W
1 3 5 7
W
BR
(R)
V
P
Y
GY
W
GY
GY
GND
10
9
7
5
3
1
BR
BR
W/O
W
7
BK
W/O
W/BR
Y
W
W/BU
W
Y
W/BU
W/BK
W
W
R
W
Y
W/BU
W
1 3 5 7
W
W/BK
DBU
DBU
R
DBU
6 8
R
W/BR
W/O
W
426±22
0 PSIG
341±22 PSIG
Cut-in
* High-Pressure Switch
W
W
WATER VALVE
2 4
P
P
P
W
Cut-out
1 3 5 7
W
W/BK
W
W
BK
P
V
BR
X11 P R
GY
GND
10
9
5
P
W
GR
3
1
V
BR
TERMINAL BLOCK
BR
5
Y
W
(D/BU)
D/BU
W
(BK)
PUMP
R
(R)
W/R
OFF
R
P
R
W/BR
W/BR
P
W
3
BK
ICE
BK
BK
W
(Y)
V
GY
O
O
P
P
P
P
Y
W
BR
(R)
P
R
Cut-in
R
BK
V
FLOAT SW.
V
V
W
V
(BK)
W (BR)
W
(Y)
V
V
R
R
R
V
O
BR
V
BR
(R)
(BK)
BK
BK
(O)
(O)
239°F±9°F (115°C±5°C)
266°F±9°F (130°C± 5°C)
R
P
(BK)
BIN CONTROL
DBU
(BK)
P
OFF
THERMISTOR
OFF
No.9 No.10
HOT GAS V
6 8 X10 VALVE
1 3 5 7
Y V
2 4
O
P
OFF
No.8
W/O GY O P
W/O
W/O
BR
BR
BR
ON
No.7
W/O
R
DBU
P
V
V
ON
No.6
LINE
(R) VALVE
R
BK
GY
BK
OFF
No.5
ON
No.5
** Thermostat Switch
BK
BK
2
Cut-out
Y
CONTROL
SW. OFF
1
R
BR
BR
BR
BK
OFF
No.4
ON
No.4
ICE SERVICE
6
V
W/O
BR
BR
OFF
No.3
OFF
No.3
GY
DBU
ON
No.2
OFF
No.2
CAP. W/R
10MFD
4
SERVICE
GY
BR
FUSE 10A
ON
WIRING
HARNESS
No.1
KMS-1402MLJ
OFF
KMS-1402MLJ
S5 DIP SWITCH SETTING
No.1
S4 DIP SWITCH SETTING
X10 WV1 AND WV2 RELAY
X11 DRAIN VALVE/HARVEST PUMP TIMER RELAY
X12 DRAIN VALVE LOCKOUT RELAY 1
X13 DRAIN VALVE LOCKOUT RELAY 2
(WV1)
P
GY (WV2)
HARVEST
FILL/
P Y GY
2 4 6 8 X12 WATER VALVE RE-FILL
W/BR
W
(Y)
W
BK
TERMINAL BLOCK
HOT GAS HOT GAS LINE
VALVE
VALVE VALVE
V
COMP.
C
P
P
P Y P
2 4 6 8 X13
W/BK
W/BK
W
W
W
(Y)
(R)
S
BR W
(W)
BK
BR
R
THERMOSTAT
** DISCHARGE
BR
(BK)
FAN
BK
BK
CAP.
10MFD
(W) BR
(BK)
FAN
BK
CAP.
10MFD
BR
V
BR
HIPRESS.
SERVICE
SWITCH 2 CIRC
GY
WASH
VALVE
W
(BK)
CRANKCASE
HEATER
C2
BK
NO BK
NC GY
T1
T2
T3
R
BR
FUSE 10A
MAGNETIC CONTACTOR
W/BK COM
BK
R
BR
BR
WIRE COLOR CODE
BK -BLACK
BR -BROWN
DBU-DARK BLUE
GR -GREEN
GY -GRAY
O -ORANGE
P -PINK
R -RED
V -VIOLET
W -WHITE
Y -YELLOW
W/BR -WHITE/BROWN
W/R -WHITE/RED
W/BK -WHITE/BLACK
W/O -WHITE/ORANGE
W/BU -WHITE/BLUE
MAIN TRANSFORMER
230V
BK
BK
GND
*
R
L1 L2 L3
BK BR R
208-230/60/3
SRK (3 PHASE)
1
2
3
1
3
2
6
5
4
7
9
8
10
3
2
1
1
2
3
1
2
3
2A8704-012
K2
K1
K5
BLACK
K4
RED
K3
WHITE
CONTROL
BOARD
3. KMS-1402MLJ with SRK-15J3
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