Hoshizaki KMS-1122MLJ Service Manual

Service Manual
Modular Crescent Cuber
Serenity Series
Models
KMS-1122MLJ with SRK-12J/3
hoshizakiamerica.com
Number: 73223
Issued: 3-21-2018
Revised: 3-12-2019
WARNING
Only qualified service technicians should install and service the appliance. To
obtain the name and phone number of your local Hoshizaki Certified Service
Representative, visit www.hoshizaki.com. No service should be undertaken until
the technician has thoroughly read this Service Manual. Failure to service and
maintain the appliance in accordance with this manual will adversely affect safety,
performance, component life, and warranty coverage 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
service of the appliance.
Should the reader have any questions or concerns which have not been satisfactorily
addressed, please call, send an e-mail message, or write to the Hoshizaki Technical
Support Department for assistance.
Phone: 1-800-233-1940; (770) 487-2331
Fax: 1-800-843-1056; (770) 487-3360
E-mail: [email protected]
618 Highway 74 South
Peachtree City, GA 30269
Attn: Hoshizaki Technical Support Department
Web Site: www.hoshizaki.com
NOTE: To expedite assistance, all correspondence/communication MUST include the
following information:
• Model Number
• Serial Number
• Complete and detailed explanation of the problem.
2
IMPORTANT
This manual should be read carefully before the appliance is serviced. Read
the warnings and guidelines contained in this manual carefully as they provide
essential information for the continued safe use, service, and maintenance of the
appliance. Retain this manual for any further reference that may be necessary.
CONTENTS
Important Safety Information.................................................................................................. 5
I. Construction and Water/Refrigeration Circuit Diagrams...................................................... 7
A. Construction................................................................................................................... 7
1. Icemaker .................................................................................................................. 7
2. Condensing Unit ...................................................................................................... 8
B. Water/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 Flow Chart (CB: 2A7664-02)............................................ 12
B. Service Diagnosis........................................................................................................ 13
C. Freeze-Time Correction Cycle (90 min.) (CB: 2A7664-02)........................................... 21
D. Control Board Check.................................................................................................... 23
E. Bin Control Check........................................................................................................ 25
F. Float Switch Check and Cleaning................................................................................. 26
G. Thermistor Check......................................................................................................... 28
H. Switches....................................................................................................................... 29
1. Control Switch......................................................................................................... 29
2. Service Switch........................................................................................................ 29
I. Diagnostic Tables........................................................................................................... 30
J. Freeze-Up Check List................................................................................................... 34
III. Controls and Adjustments................................................................................................ 35
A. Control Board Layout................................................................................................... 36
B. LED Lights and Audible Alarm Safeties........................................................................ 37
C. Settings and Adjustments............................................................................................. 38
1. Default Dip Switch Settings..................................................................................... 38
2. Harvest Timer (S4 dip switch 1 & 2)....................................................................... 39
3. Pump-Out Timer/Harvest Time During Pump-Out (S4 dip switch 3 & 4)................ 39
4. Pump-Out Frequency Control (S4 dip switch 5)...................................................... 40
5. Harvest Pump Time (Harvest Assist Duration) (S4 dip switch 6)............................ 40
6. Harvest Pump Time (Harvest Assist)/Freeze-Time Correction (S4 dip switch 7).... 41
7. Factory Use (S4 dip switch 8)................................................................................. 41
8. Freeze Timer (S4 dip switch 9 & 10)....................................................................... 42
9. Float Switch Control Selector for Refill (S5 dip switch 1)........................................ 42
10. Refill Counter (S5 dip switch 2 and 3)................................................................... 43
11. Minimum Harvest Time (S5 dip switch 4).............................................................. 43
12. Anti-Slush (S5 dip switch 5).................................................................................. 43
3
IV. Refrigeration Circuit and Component Service Information.............................................. 44
A. Refrigeration Circuit Service Information..................................................................... 44
B. Component Service Information................................................................................... 47
V. Maintenance..................................................................................................................... 48
VI. Preparing the Appliance for Periods of Non-Use............................................................. 49
VII. Disposal.......................................................................................................................... 50
VIII. Technical Information..................................................................................................... 51
A. Specification and Performance Data Sheets................................................................ 51
1. KMS-1122MLJ with SRK-12J.................................................................................. 51
2. KMS-1122MLJ with SRK-12J3................................................................................ 52
3. SRK-12J................................................................................................................. 53
4. SRK-12J3............................................................................................................... 54
B. Wiring Diagrams........................................................................................................... 55
1. Wire Harness Connections...................................................................................... 55
2. KMS-1122MLJ with SRK-12J.................................................................................. 56
3. KMS-1122MLJ with SRK-12J3................................................................................ 57
4
Important Safety Information
Throughout this manual, notices appear to bring your attention to situations which could
result in death, serious injury, damage to the appliance, or damage to property.
WARNING
Indicates a hazardous situation which could result in death or
serious injury.
NOTICE
Indicates a situation which could result in damage to the
appliance or property.
IMPORTANT
Indicates important information about the use and care of the
appliance.
WARNING
The appliance should be destined only to the use for which it has been expressly
conceived. Any other use should be considered improper and therefore dangerous.
The manufacturer cannot be held responsible for injury or damage resulting from
improper, incorrect, and unreasonable use. Failure to service and maintain the
appliance in accordance with this manual will adversely affect safety, performance,
component life, and warranty coverage and may result in costly water damage.
To reduce the risk of death, electric shock, serious injury, or fire, follow basic
precautions including the following:
• Only qualified service technicians should install and service the appliance.
• The 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: Move the KMS 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.
• The appliance is not intended for use by persons (including children) with reduced
physical, sensory, or mental capabilities, or lack of experience and knowledge,
unless they have been given supervision or instruction concerning use of the
appliance by a person responsible for their safety.
• Children should be properly supervised around the 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 ICEMAKER MUST BE GROUNDED. Failure to properly ground the icemaker
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/ice storage bin is for ice use only. Do not store anything else in
the dispenser unit/ice storage bin.
6
I. Construction and Water/Refrigeration Circuit Diagrams
A. Construction
1. Icemaker
Hot Gas Valve
Thermostatic Expansion Valve
Evaporator
Inlet Water Valve
X12 Relay
(drain valve relay)
Cleaning Valve
X10 Relay
(pump motor relay)
Thermistor
X11 Relay
(inlet water valve relay)
Drain Valve
Drier
Control Board
Pump Motor
Control Box
Float Switch
Shut Off Valves
(Low Side and High Side)
Bin Control
Thermostat
Liquid Line Valve
Service Switch
Fuse
Control Switch
Bin Control
Insulation
Bin Control Cover
Bin Control Bracket
Manual Access Valve (High Side)
Bin Control Bulb Holder
7
2. Condensing Unit
Condenser
Liquid Line Valve
Hot Gas Valve
Headmaster
Start Relay
Shut Off Valve
(Low Side)
Fuse
Capacitors
Magnetic
Contactor
Control Box
Junction Box
Fan Motors and Fan Blades
Shut Off Valve (High Side)
Compressor
Receiver
Accumulator
Crankcase Heater
Discharge Line Thermostat
Model Shown: SRK-12J
8
9
Drain
Float Switch
Evaporator
Water Tank
Spray Tube
Thermistor
Liquid Line
Valve
Check
Valves
Strainer
Hot Gas
Valve
Heat Exchanger
Drier
Drain Valve
Cleaning Valve
Thermostatic Expansion Valves
Pump Motor
Inlet Water
Valve
Water Supply
KMS-1122MLJ
Shut
Off
Valves
Accumulator
Suction
Line
Discharge
Line
Compressor
Check Valve
Receiver
Headmaster
Fans
Condenser
SRK-12J/3
Discharge Line
Thermostat
Strainer
Liquid Line
Valve
Strainer
High-Pressure
Switch
Hot Gas Valve
B. Water/Refrigeration Circuit Diagram
10
Comp energized
FMRs energized
HGVs energized
WV energized
FS closed
Thermistor
in control
FS check
When freeze time differential exceeded,
freeze-time correction cycle starts.
See "II.A.3. Freeze-Time Correction Chart."
Comp energized
FMRs energized
HGVs energized
PM de-energizes for 2 sec.,
then restarts for 10/20 sec.
LLVs de-energized
CB - 2A7664-02:
Anti-Slush
Thermistor temperature
reaches 36°F (2.2°C)
(5.8 kΩ).
PM de-energized for
10 sec.
FS opens or freeze
timer terminates
FS in control
• Factory set for every 10th
cycle
(S4 dip switch 5)
• Pump motor stops for
2 sec., then restarts for
10/20 sec.
(S4 dip switch 3 & 4)
4. Pump-Out Cycle
Power is supplied to the pump and drain valve. This drains the water tank.
WASH
Power is supplied to the pump and cleaning valve. This operation is used to circulate cleaner
and sanitizer over both the inside and outside surfaces of the evaporator.
CIRCULATE 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.
DRAIN
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," "CIRCULATE," and "WASH." See the information below for details of each
function.
Comp energized
FMRs energized
PM energized
LLVs energized
HGVs de-energized
FS closed
5-min.
minimum
freeze timer in
control
• Min. freeze time: 5 min.
• Max. freeze time: freeze timer setting
(S4 dip switch 9 & 10).
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
WV 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
If FS is open, Comp stops and cycle
returns to 1-Min. fill.
FS open
WV energized
FS check
1. 1-Minute
Fill Cycle
1. Operation Flow Chart
Legend:
BC–bin control
CB–control board
Comp–compressor
DV–drain valve
FMRs–fan motors-remote
FS–float switch
HGVs-hot gas valves (KMS and SRK)
HPT–harvest pump time
LLVs-liquid line valves (KMS and SRK)
PM–pump motor
WV–inlet water valve
Startup
Cycle
Steps
Operation Flow Chart
II. Sequence of Operation and Service Diagnosis
A. Sequence of Operation Flow Chart
11
Within 10 sec.
after ice contacts
BC bulb, icemaker
shuts down.
1. Bin Full
BC open
All components
de-energized
All components
de-energized.
No ice touching
BC bulb.
Icemaker starts at
"1. 1-Minute Fill Cycle."
3. Ice Level Lowered
To 1. 1-Minute Fill Cycle
BC closed
NOTE: control board green "BC CLOSED" LED on
continuously when the K4 jumper is in place.
2. Icemaker Off
Control board retains freeze-time correction (CB: 2A7664-02 Only)
count data between bin control restarts.
Ice contacts BC bulb
BC Operation
Shutdown
and Restart
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 restarts 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 (CB: 2A7664-02)
3. Freeze-Time Correction Flow Chart (CB: 2A7664-02)
B. Service Diagnosis
WARNING
• The appliance should be diagnosed and repaired only by qualified service
personnel to reduce the risk of death, electric shock, serious injury, or fire.
• Risk of electric shock. 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/ice storage bin.
• Make sure all food zones in the icemaker and dispenser unit/ice storage bin are
clean after service.
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-1122MLJ:
• The appliance is not intended for outdoor use. Normal operating ambient temperature
should be within 45°F to 100°F (7°C to 38°C).
• Allow 15" (38 cm) clearance on left side for removal of spray tube and cube guide.
There is no minimum clearance required for proper operation.
• The appliance should not be located in a corrosive environment.
SRK-12J/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 CB K4 red
jumper. Move ice away from BC bulb.
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."
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, go to KMS
and check for 115VAC at BC wires (BR) to neutral (W). If 115VAC is present on
one and not the other, BC is open. See "II.E. Bin Control Check." If BC 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. WV and X11 relay energize. After 1 min., CB checks for
a closed FS. If FS is closed, the harvest cycle begins. If harvest cycle begins (Comp,
HGVs, and FMRs energized), continue to step 5a. If FS is open, WV remains energized
until FS closes (low water safety protection during initial start up and at the end of each
harvest). Diagnosis: Check that water enters the water tank. If not, check that the water
supply line shut-off valve is open and screens or external filters are clear. Check for
115VAC at CB K1 #6 (O) to neutral (W). If 115VAC is not present, replace CB. If 115VAC
is present, and WV does not energize, check for 115VAC at WV. If 115VAC is present,
check WV coil continuity. If open, replace WV. If the water tank fills, but the appliance
fails to start harvest (Comp energized), check for open FS. See "II.F. Float Switch
Check and Cleaning." If FS is closed and CB fails to start the harvest cycle after 1 min.,
replace CB.
5a) Initial Harvest Cycle – LEDs 1, 4, and 2 are on. WV and X11 relay continue. Comp,
FMRs, HGVs, and X10 relay energize. CB monitors the warming of the evaporator via
the thermistor located on the suction line. When the thermistor reaches 48°F (9°C),
CB reads 3.9 kΩ from the thermistor and turns harvest termination over to the harvest
timer (S4 dip switch 1 & 2 and S5 dip switch 4). WV and X11 relay are energized during
harvest for a maximum of 6 min. or the length of harvest minus HPT setting (S4 dip
switch 6), whichever is shorter. See step 5b below.
a) Comp Diagnosis: Check that evaporator is warming. If not, confirm that Comp
energizes. If not, check for 115VAC at CB K1 #1 (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 external overload, Comp start and run capacitors, Comp
start relay (single phase), and Comp motor winding.
b) HGVs Diagnosis: If Comp is energized and evaporator is not warming, check
that HGVs energizes 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
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 WV de-energizes,
LED 4 turns off, X11 relay de-energizes and LED 3 turns on. PM energizes. Comp,
FMRs, HGVs, and X10 relay continue.
Diagnosis: Place a thermometer on the suction line next to the thermistor. Has it
warmed to 48°F (9°C) or warmer? Confirm thermistor status. See "II.G. Thermistor
Check." If the thermistor reading is in proper range, dip switch 7 is on, and PM does
not energize before harvest terminates, replace CB. If WV continues, check for 115VAC
at CB K1 #6 (O). If 115VAC is present, and LED 4 is off, replace CB. If 115VAC is not
present, and WV continues, check WV diaphragm for leaking by. Clean or replace.
If LED 3 is on and PM is not energized, check for 115VAC at CB K1 #5 (DBU).
If 115VAC is not present, replace CB. If 115VAC is present and PM is not energized,
check for 115VAC at X10 relay terminal #8 (Y) to neutral (W). If 115VAC is not present,
check for 115VAC at X10 relay terminal #4 (P) to neutral (W) and X10 relay terminal
#6 (Y) to neutral (W). If 115VAC is present on terminal #4 (P) and not on terminal
#6 (Y), replace X10 relay. If 115VAC is present on X10 relay terminal #8 (Y) and PM
is not energized, check for 115VAC at X10 relay terminal #3 (R) to neutral (W) and
terminal #5 (DBU) to neutral (W). If 115VAC is present on terminal #5 (DBU) and
not on terminal #3 (R), replace X10 relay. If 115VAC is present on X10 relay terminal
#3 (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." If 1-min. fill cycle
starts after harvest timer terminates, check that FS is clean and operating properly, see
"II.F. Float Switch Check and Cleaning." If FS is closed, CB proceeds to the next cycle.
If not, replace CB.
Note: The minimum total time allowed by CB for a complete harvest cycle is based on
S5 dip switch 4. Maximum harvest time allowed is 20 min.
NOTICE! S4 dip switch 7 must remain on. Otherwise, PM will not energize during
the last seconds of harvest.
6) Freeze Cycle – LED 1 is on. Comp, FMRs, and PM continue. LLVs energize.
HGVs and X10 relay de‑energize. Appliance is held in freeze by a 5-min. short cycle
protection timer. After 5-min. short cycle protection timer terminates and FS opens,
freeze cycle terminates.
Note: PM power supply switches from CB K1 #5 (DBU) in harvest to K1 #4 (R) in freeze.
Anti-Slush: When anti-slush is enabled (S5 dip switch 5 "ON"), PM de-energizes when
thermistor reaches 36°F (2.2°C) (5.8kΩ) for 10 sec. then, energizes for the remainder of
the freeze cycle.
16
a) Freeze Cycle Diagnosis: Confirm Comp, FMRs, and PM continue. Confirm that
LLVs energize. Next, confirm HGVs and X10 relay de-energize. During the first
5 min. of freeze, confirm evaporator is cooling. If not, confirm WV de-energized (not
leaking by), HGVs de-energized (not bypassing), LLVs energizes, 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. If MC is okay, check Comp start relay and start and
run capacitors (single phase). Next, check Comp motor winding continuity. If Comp
is energized but evaporator is not cooling, check for an inefficient Comp. See "VIII.A.
Specification and Performance Data Sheets."
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) WV and HGVs Diagnosis: If WV is energized, check for 115VAC at CB K1 #6 (O)
to neutral (W). If 115VAC is present after PM energizes in harvest cycle, replace
CB. If 115VAC is not present, replace WV (bypassing). If HGVs (KMS and SRK) did
not de‑energize at the end of harvest, check for 115VAC at CB K1 #2 (P) to neutral
(W). If 115VAC is present 50 sec. after PM energizes, replace CB. If 115VAC is not
present, replace HGV(s) (bypassing).
d) PM Diagnosis: Confirm water is flowing over evaporator from PM and not WV.
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 #6 (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 does not energize, check for 115VAC at CB K1 #3 (BK) to
neutral (W). If 115VAC is not present, replace CB. If 115VAC is present, check coil
voltage and continuity.
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.
17
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, WV screen.
If water tank empties before 5 min. timer terminates and freeze cycle is short, check
that DV is not leaking by or energized (water flowing through DV). If DV is leaking by,
remove and clean DV, replace as needed. If water tank is full, see "II.F. Float Switch
Check and Cleaning." for erratic operating FS.
7) Pump-Out Cycle – LEDs 1, 3, and 2 are on (10/20 second pump-out). Timing of the
first pump-out is determined by S4 dip switch 5. See the table below.
Control Board Settings
S4 Dip Switch Setting
Pump-Out Frequency
Control Board
OFF
Every 10 cycles
After 11th freeze cycle
ON
Every cycle
After 2nd freeze cycle
No. 5
Comp and FMRs continue, HGVs energize.
Note: If S4 dip switch 3 & 4 are set to 3 off and 4 on, LED 4 turns on and WV and X11
relay energize, energizing X10 relay. NOTICE! S4 dip switch 3 & 4 must not be set
to 3 off and 4 on. Otherwise, LED 4 turns on energizing WV and X11 relay. X11
relay energizes X10 relay. Once X10 relay energizes, X12 relay cannot energize.
Preventing DV from energizes.
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 10 cycles or 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.
18
b) CB Diagnosis: Confirm LLVs de-energize. If LLVs are energized with LEDs 1, 3,
and 2 on, replace CB. If PM does not stop and restart and DV does not energize,
check that CB LEDs 1, 3, and 2 are on. If not, replace CB. If LEDs 1, 3, and 2 are on
and X12 relay is not energized, 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
X12 relay is not energized, continue to "c) X12 Relay Diagnosis:" below. If X12
relay is energized and DV are not energized, check for 115VAC at CB K1 #2 (P) to
neutral (W). If LED 2 is on and 115VAC is not present at CB K1 #2 (P), replace CB.
c) X12 Relay Diagnosis: If 115VAC is present at CB K1 #5 (DBU) and CB K1 #2 (P)
and X12 relay and DV is not energized, check for 115VAC at X12 relay #8 (DBU) to
neutral (W). If 115VAC is not present, check wiring connections from CB K1 #5 (DBU)
to X10 relay #5 (DBU), then at X10 relay #1 (DBU). If 115VAC is present at X10 relay
#5 (DBU) and not at X10 relay #1 (DBU), confirm X10 relay is de-energized, if X10
relay is de-energized, replace X10 relay (sticking contacts). If 115VAC is present
at X12 relay #8 (DBU) to neutral (W), and X12 is de‑energized, check relay coil
continuity. Replace as needed.
d) PM Diagnosis: Check for 115VAC at X12 relay #6 (P) to neutral (W). If 115VAC is
not present, see "b) CB Diagnosis" above. Next, check for 115VAC at X12 relay
#4 (W/R) to neutral (W). If 115VAC is not present, confirm X12 relay is energized.
If X12 relay is de-energized, see "c) X12 Relay Diagnosis:" above. If X12 relay
is energized and 115VAC is present at X12 relay #6 (P) and not at X12 relay
#4 (W/R), replace X12 relay. If 115VAC is present at X12 relay #4 (W/R) and PM is
de‑energized, check PM capacitor, motor winding, wiring connections, and impeller
for binding.
e) DV Diagnosis: Check for 115VAC at X12 relay #5 (P) to neutral (W) and at X12 relay
#3 (GY) to neutral (W). If 115VAC is not present at X12 relay #5 (P),
see "b) CB Diagnosis:" above. If 115VAC is present at X12 relay #5 (P) and not at
X12 relay #3 (GY), confirm X12 relay is energized. If X12 relay is de-energized,
see "c) X12 Relay Diagnosis:" above. If X12 relay is energized and 115VAC
is present at X12 relay #5 (P) and not at X12 relay #3 (GY), replace X12 relay.
If 115VAC is present at X12 #3 (GY) and DV is de-energized, check 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.
19
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. NOTICE! CB red K4 connector jumper (4A4883G01) must be in place.
3. Freeze-Time Correction Cycle Diagnosis
1) See "II.C. Freeze-Time Correction Cycle (90 min.) (CB: 2A7664-02).""
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;
WV–inlet water valve
20
C. Freeze-Time Correction Cycle (90 min.) (CB: 2A7664-02)
Freeze-Time Correction function is enabled when S4 Dip Switch 7 is in the "ON" position
and initiates when the difference between the minimum and maximum recorded
freeze times is equal to or greater than values shown in the table below. Freeze time
is recorded and freeze cycles are counted starting at the 2nd freeze cycle after startup
from a power off condition. After 3 recorded freeze cycles, CB starts comparing the
minimum and maximum differential of recorded freeze cycles times. Up to 10 freeze
cycles are recorded and maintained in memory. At the 11th recorded freeze cycle,
the first recorded freeze cycle time is dropped to maintain the maximum number of
10 recorded freeze cycles. Freeze time recordings and freeze cycle counts restart after a
BC off cycle and resume at the 2nd freeze cycle after BC restart.
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
1) Initiation and CB Operation: When the differential between minimum and maximum
recorded freeze times exceeds the values in the table above, freeze‑time correction
cycle starts. 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.
21
2) Freeze-Time Correction Sequence:
First occurrence within 36 hr., minimum and maximum freeze times have exceeded
differential parameters. CB "POWER OK" LED starts blinking. Freeze-Time Correction
Cycle starts.
Second occurrence within 36 hr., minimum and maximum freeze times have exceeded
differential parameters. If not reset, CB "POWER OK" LED continues blinking. If reset
from first occurrence, CB "POWER OK" LED starts blinking. Freeze-Time Correction
Cycle starts.
Third occurrence within 36 hr. minimum and maximum freeze times have exceeded
differential parameters. CB yellow "EXT HARVEST" LED starts blinking. Also, If not
reset, CB "POWER OK" LED continues blinking. If reset, CB "POWER OK" LED starts
blinking. Freeze-Time Correction Cycle starts.
Total freeze-time correction cycle last for 90 min. At the end of 80 min., the final step
initiates and final Harvest Pump Time (Harvest Assist) with WV (10‑min.) starts. Once
the final Harvest Pump Time (Harvest Assist) with WV (10-min.) terminates
(90 min. complete), normal freeze cycle begins.
2a) 10-Min. Harvest Pump Time (Harvest Assist) with WV: CB "POWER OK" LED
blinking. CB LEDs 1, 4, 3, and 2 are on and Comp, FMRs, HGV, PM, and WV energize.
10-min. timer starts. Once 10‑min. timer terminates, CB LEDs 1, 3, and 2 turn off and
Comp, FMRs, HGV, and PM de-energize. WV continues.
2b) 10-Min. Fill: CB LED 4 on and WV energized. 10-min. timer starts.
2c) Final 10-Min. Harvest Pump Time (Harvest Assist) with WV: CB "POWER OK" LED
blinking. Once 10‑min. timer terminates, CB LEDs 1, 4, 3, and 2 are on and Comp,
FMRs, HGV, and PM energizes. WV continues. 10-min. timer starts. Once 10-min.
timer terminates, normal freeze cycle begins. CB LED 1 on and Comp, FMRs, and PM
continue. HGV and WV de-energize.
Note: After 3rd Freeze-Time Correction Cycle in 36 hours, CB signals with blinking CB
yellow "EXT HARVEST" LED. Appliance continues normal operation.
CB "POWER OK" LED and CB yellow "EXT HARVEST" LED continue blinking in
normal operation sequence.
3) Appliance Cycle Reset and CB Alarm Reset:
Cycle Reset: Power supply or control switch turned off and on again: Appliance turns
off, then restarts 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–cleaning valve; DV–drain valve; FM–fan motor; FMRs–fan motor remote;
FS–float switch; HGV–hot gas valve; HM–headmaster (C.P.R.); HPS–high-pressure
switch; LLVs–liquid line valve; MC–magnetic contactor: PM–pump motor;
TXV–thermostatic expansion valve; WV–inlet water valve
22
D. Control Board Check
Before replacing CB that does not show a visible defect and that you suspect is bad,
always conduct the following check procedure. This procedure will help you verify your
diagnosis.
Alarm Reset: If CB is in alarm (beeping), press the "ALARM RESET" button on CB
while CB is beeping. WARNING! Risk of electric shock. Care should be
taken not to touch live terminals. Once reset, the icemaker starts at the
1-minute fill cycle. For audible alarm information, see "III.B. LED Lights and
Audible Alarm Safeties."
1) Check the dip switch settings to assure that S4 dip switch 3, 4, 7, 8, 9, 10 and S5 dip
switch 1 through 5 are in the factory default position. S4 dip switch 1, 2, 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 (10.5VAC), check CT primary
circuit. Check for 115VAC at control switch terminal #2 (BR) and control switch terminal
#3 (BK) to neutral (W). If 115VAC is present at control switch terminal #2 (BR) and not
at control switch terminal #3 (BK), replace control switch. If 115VAC is present at control
switch terminal #3 (BK), check CT coil continuity. Replace as needed. 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
"J"
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.
23
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).
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.
Legend: CB–control board; CT–control transformer
ALARM RESET
#1 to #2
5VDC
#1 to #2
5VDC
#1 to #3
5VDC
#1 to #3
#2 to #3
0VDC
#2 to #3
S3
VDC
#1 to #2
1.2VDC
5VDC
#1 to #3
2VDC
0VDC
#2 to #3
1.2VDC
CB
1
ON
1
1 2 3 4 5
RED
K5
S5
Float Switch
BLACK
3
K4
Jumper
X4
6
10
9
8
7
ALP
X3
LED 4
C
5
4
3
X2
LED 3
2
1
K1
POWER
OK
3
1
Thermistor
LED 2
K6
P/N 2A3792-01
K7
BC OPEN
BC CLOSED
Pin #
WHITE
VDC
3
Pin #
K5 Float Switch
K3
VDC
S4
S2
Pin #
1 2 3 4 5 6 7 8 9 10
K4 Jumper
ON
LED 1
K2
1
24
2
3
X1
K3 Thermistor
OUTPUT TEST
E. Bin Control Check
To check BC, follow the steps below.
NOTICE
When the ambient temperature is below 45°F (7°C), BC switch opens and
shuts down the appliance even if the ice storage bin is empty. When BC is
set in the prohibited range, the appliance operates continuously even if the ice
storage bin is filled with ice. Setting in the prohibited range may result in severe
damage to 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.
Note: • When BC switch is open, CB red "POWER OK" LED is off.
• CB yellow "BC OPEN" LED is on if CB red K4 connector does not have the
jumper in place.
1) Turn off the power supply.
2) Remove the front panel, then move the control switch to the "OFF" position.
3) Clear any ice away from BC bulb.
4) Remove the control box cover, then disconnect BC wires from BC switch.
5) Hold your hand around BC bulb to warm it up.
6) Check for continuity across BC switch. If closed, continue to step 6. If open, adjust or
replace BC.
7) With the multimeter test leads still in place, hold ice on BC bulb to lower the temperature
Within 10 sec., BC switch should open. If it remains closed, adjust or replace BC.
Legend: BC–bin control; CB–control board
25
F. Float Switch Check and Cleaning
FS is used to confirm sufficient water in the water tank after the 1‑min. fill cycle and
after each harvest cycle. FS is also used to terminate the freeze cycle. No adjustment is
required.
1. Float Switch Check
To check FS, follow the steps below.
1) Turn off the power supply.
2) Remove the front panel.
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 min.
5) Turn off the power supply.
6) Remove the front panel, then move the control switch to the "OFF" position.
7) Remove the control box cover, then disconnect FS connector from CB black
K5 connector.
8) Check for continuity across FS leads. With the water tank empty, FS should be open.
If open, continue to step 9. If closed, follow the steps in "II.F.2. Float Switch Cleaning."
After cleaning FS, check it again. Replace if necessary.
9) Reconnect FS connector to CB black K5 connector, then replace the control box cover
in its correct position.
10) Move the control switch to "ICE" position. Replace the front panel.
11) Turn on the power supply.
12) As water fills the water tank, FS contacts should close. After 1 min., the 1-min. fill cycle
should end and the initial harvest cycle should begin. If harvest cycle doesn't start after
1 min. check continuity of FS with water tank full. If open, replace FS. If closed and
harvest cycle has not started, replace CB.
13) Once the harvest cycle starts, turn off the power supply.
14) Remove the front panel, then move the control switch to the "OFF" position.
15) Remove the control box cover, then disconnect FS connector from CB black
K5 connector.
16) Check for continuity across FS leads. With the water tank full, FS should be closed.
If FS is closed and the appliance will not switch from the 1-min. fill cycle to the initial
harvest cycle, replace CB.
17) If open, confirm that the water tank is full. If the water tank is not full, check the water
supply, water filters, and inlet water valve. If the water tank is full, follow the steps in
"II.F.2. Float Switch Cleaning." After cleaning FS, check it again. Replace if necessary.
18) Reconnect FS connector to CB black K5 connector, then replace the control box cover
in its correct position.
26
19) Move the control switch to the "ICE" position.
20) Replace the front panel in its correct position.
21) Turn on the power supply to start the automatic icemaking process.
Legend: CB–control board; FS–float switch
2. Float Switch Cleaning
Depending on local water conditions, scale may build up on FS. Scale can cause FS to
stick. In this case, FS 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 min.
5) Turn off the power supply.
6) Remove the front, apron, top, left side panels, and side insulation, then move the control
switch to the "OFF" position.
7) Remove FS assembly and FS stop. See Fig. 1.
8) Remove the retainer rod from the bottom of FS assembly, then remove the float.
Be careful not to bend the retainer rod excessively when removing it.
9) Wipe down FS assembly's housing, shaft, float, and retainer rod with a mixture of 1 part
Hoshizaki "Scale Away" and 25 parts warm water. Rinse the parts thoroughly with clean
water.
10) Reassemble FS assembly and replace it and FS stop in their correct positions.
11) Replace the side insulation, left side, top, and apron panels in their correct positions.
12) Move the control switch to the "ICE" position.
13) Replace the front panel in its correct position.
14) Turn on the power supply to start the
automatic icemaking process.
Legend: CB–control board; FS–float switch
Shaft
Float Switch
Stop
Float Switch
Housing
Float
Retainer Rod
Fig. 1
27
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 control box cover.
4) Remove the thermistor.
5) Immerse the thermistor sensor portion in a glass containing ice and water for 2 or 3 min.
6) Disconnect the thermistor connector from CB white K3 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 white K3 connector.
9) Replace the control box cover in its correct position.
10) Move the control switch to the "ICE" position.
11) Replace the front panel in its correct position.
12) Turn on the power supply.
13) Once the harvest cycle starts (Comp energizes), begin timing the harvest cycle.
14) The harvest timer and harvest cycle should terminate within 2 to 5 min. If the harvest
cycle does not terminate within 2 to 5 min., replace CB.
Legend: CB–control board; Comp–compressor
Thermistor Lead
Foam Insulation
Cable Tie
Thermistor Holder
Fig. 2
28
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 water 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
wash valve. This operation is used to circulate cleaner and sanitizer over both the inside
and outside of the evaporator.
29
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.
b) Not within specifications.
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) No neutral. White wire (W) to ground 0VAC. (white wire (W) to
ground 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 faulty.
c) Defective.
d) Hot gas valves 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. Bin Control
See "II.E. Bin Control Check"
a) Tripped with bin filled with ice.
b) Ambient temperature too cool.
c) Bulb out of position.
d) Set too warm.
e) Defective.
f) K4 connector does not have jumper in place.
10. Control Switch
a) In "SERVICE" or "OFF" position.
b) Bad contacts.
11. Control Transformer
(115VAC/10.5VAC)
a) Coil winding open or shorted.
12. Control Board
See "II.D. Control Board Check"
a) In alarm.
b) Yellow "BC OPEN" LED on (jumper loose or missing).
c) Defective.
30
No Ice Production - Possible Cause
13. Inlet Water Valve
a) Screen or orifice clogged.
b) Coil winding open.
c) Water valve open in freeze cycle.
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) Magnetic contactor contacts bad or coil winding open.
b) Motor winding open.
c) Bearing worn out or locked rotor.
d) Defective capacitor.
22. Headmaster
a) Defective.
23. Water System
a) Water leaks causing short freeze time.
31
2. Freeze-Up
Defrost and clean the icemaker prior to diagnosing freeze-up. Fill out a freeze-up
checklist. The freeze-up checklist can be found in the Hoshizaki Technician's Pocket
Guide or contact your local distributor for a copy of the freeze-up checklist.
Freeze-Up - Possible Cause
Harvest Cycle
1. Evaporator
a) Scaled up.
b) Damaged.
2. Cube Guides
a) Out of position.
b) Damaged.
3. Spray Tubes and/or Spray
Guides
a) Dirty.
4. Water Supply
a) Low water pressure.
b) Out of position.
b) External water filters clogged.
c) Insufficient water line size.
Minimum 3/8" nominal ID copper water tubing or equivalent.
5. Inlet Water Valve
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, or
Splash Guard
a) Dirty.
3. Refrigerant Charge
a) Low.
4. Control Board
See "II.D. Control Board Check"
a) Freeze timer (S4 dip switch 9 & 10) set incorrectly.
5. Inlet Water Valve
a) Leaking by.
b) Out of position.
b) Defective.
6. Float Switch
a) Float does not move freely.
See "II.F. Float Switch Check and b) Defective.
Cleaning"
7. Pump Motor
a) RPM too slow.
b) Impeller damaged.
32
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
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. Inlet Water Valve
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. Inlet Water Valve
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
a) Inefficient or off.
10. Pump Motor
b) Defective.
b) Defective.
a) RPM too slow.
11. Liquid Line Valves (KMS & SRK) a) Erratic or restricted.
12. Headmaster
a) Defective.
33
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
34
III. Controls and Adjustments
• A Hoshizaki exclusive control board is employed in the KMS-1122MLJ series.
• 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
appliance 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.
35
A. Control Board Layout
"J" Control Board
• Bin Control Switch
Closed LED (green)
• "ALARM RESET" Button
• S4 Dip Switch
• "OUTPUT TEST" Button
(used to test relays on control board)
• K3 (white) Connector
Thermistor
(harvest control and
high temperature safety)
• Bin Control Switch
Open LED (yellow)
• Alarm Buzzer
• K4 (red) Connector
K4 Jumper
• Ext. Harvest
LED (yellow)
(blinks when
3rd occurrence
of freeze time
correction initiates
within 36 hr.)
• K5 (black) Connector
Float Switch (water level)
2A7664-04
• POWER OK LED
(red) (lights when
10.5VAC is supplied
to K2 connector)
• S5 Dip Switch
• K1 Connector
Pins #1 through #10
#1, 9 Magnetic Contactor
#2 Hot Gas Valves, X10 Relay
#3 Liquid Line Valves
#4 Pump Motor (icemaking)
#5 Pump Motor
(harvest pump time and
pump-out), X12 Relay
#6 Inlet Water Valve, X11 Relay
#7, 10 Component Power Supply
#8 Open
• Relay LEDs
(4) (indicate which
relays are energized
and which K1
connector pins are
energized
• LED 2 (X2 Relay)
LED 2 on:
K1 Connector Pin #2
LED 2 off:
K1 Connector Pin #3
• LED 3 (X3 Relay)
LED 3 on:
K1 Connector Pin #5
LED 3 off:
K1 Connector Pin #4
(energized in freeze)
• LED 4 (X4 Relay)
K1 Connector Pin #6
• LED 1 (X1 Relay)
K1 Connector Pin #1, #9
• Part Number
• K2 Connector
Control Transformer
(10.5VAC)
"J" Control Board
Part Number 2A7664-04
36
B. LED Lights and Audible Alarm Safeties
Beep occurs and red "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*, FMR, HGV, WV
Comp, FM*, FMR, HGV, PM
1 minute 20 minutes
0 seconds 50 seconds
1
Comp, FM/FMR, PM, LLV
5 minutes
Anti-Slush Control
1, 3
Comp, FM/FMR, LLV
Pump-Out Cycle
1, 4†, 3, 2 Comp, FM*, FMR, HGV, PM, WV †, DV
*FM energized if on K1 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 (CB-2A7664-02)
(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 3 freeze‑time correction cycles in 36 hours, yellow
EXT HARVEST LED also blinks.
Fill out freeze-up checklist. See "II.J. Freeze-Up Check
List."
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: CB–control board; Comp–compressor; FM–fan motor; FMR–fan motor remote;
FS–float switch; HGV–hot gas valve; HM–headmaster (C.P.R.); LLV–liquid line
valve; PM–pump motor; TXV–thermostatic expansion valve; WRV–water regulating
valve; WV–inlet water valve
37
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-1122MLJ
1
2
3
4
5
6
7
8
9
10
OFF OFF OFF OFF ON OFF ON OFF OFF OFF
S5 Dip Switch (Do Not Adjust)
Dip Switch No.
KMS-1122MLJ
1
2
3
4
5
OFF OFF OFF OFF ON
S4 Dip Switch
"J" Control Boards
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 Timer (1 & 2)
S5 Dip Switch
"J" Control Board Only
1 2 3 4 5
Do Not Adjust
ON
1 2 3 4 5 6 7 8 9 10
ON
Freeze Timer (9 & 10)
Anti-Slush (5)
Minimum Harvest Time (4)
Refill Counter (2 and 3)
Float Switch Selector (1)
38
2. Harvest Timer (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. Before changing this setting, contact Hoshizaki
Technical Support at 1‑800‑233-1940 for recommendations. Keep in mind that setting the
harvest timer to a longer setting decreases 24-hour production.
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.
S4 Dip Switch Setting
No. 1
No. 2
Time
(sec.)
OFF
OFF
60
ON
OFF
90
OFF
ON
120
ON
ON
180
3. Pump-Out Timer/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
Inlet Water
Valve
T2
S5-4 OFF
S5-4 ON
S5-4 OFF
S5-4 ON
10
150
100
Closed
Closed
OFF
10
180
130
Closed
Closed
OFF
ON
10
120
70
Open
Closed
ON
ON
20
180
180
Closed
Closed
T1: Time to drain the water tank
T2: Harvest timer at pump out
39
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 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 Duration)
No. 6
S5-4 OFF
S5-4 ON
OFF
50 sec.
25 sec.
ON
25 sec.
15 sec.
40
6. Harvest Pump Time (Harvest Assist)/Freeze-Time Correction (S4 dip switch 7)
NOTICE
Factory set for proper operation. Do not adjust. Adjustment outside of the factory
default setting may result in damage to the appliance.
a) Harvest Pump Time (Harvest Assist)
Depending on S4 dip switch 7 setting, the pump motor either stays off or is energized
during the last seconds of the harvest cycle. When the pump motor is energized (S4 dip
switch 7 on), water circulates over the evaporator. The harvest water valve is open during
harvest for a maximum of 6 minutes or the length of harvest minus the harvest pump
time value(S4 dip switch 6), whichever is shorter.
When S4 dip switch 7 is in the on position and harvest begins, X11 and X10 relays
energize. A latching circuit is created through the X11 and X10 relays. For further details,
see "VIII.B. Wiring Diagrams." In the factory default position, 50 sec. before harvest
termination, LED 4 turns off, inlet water valve and X11 relay de‑energize. X10 relay
remains energized through the latching circuit. Next, LED 3 turns on and control board
K1 connector pin #5 (DBU wire) energizes, energizing the pump motor through contacts
on the energized X10 relay (#5 and #3) for the last seconds of harvest. Harvest pump
time adjusted by S4 dip switch 1 & 2 and S5 dip switch 4 settings. Contact Technical
Support before adjusted these settings.
b) Freeze-Time Correction (CB: 2A7664-02)
When S4 dip switch 7 is in the on position, freeze-time correction enabled.
See "II.C. Freeze-Time Correction Cycle (90 min.) (CB: 2A7664-02)."
S4 Dip Switch Setting Harvest Pump Time
(Harvest Assist)
No. 7
Freeze-Time Correction
(CB: 2A7664-02)
OFF
Disabled
ON
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.
41
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 for Refill (S5 dip switch 1)
NOTICE
Do not adjust. This must be left in the factory default position or the icemaker will
not operate correctly. This setting is ignored if refill counter (S5 dip switch 2 and 3)
set to 0. The KMS‑1122MLJ uses a single float switch with no refills.
Float switch control selector for refill is used in applications where refill is required in the
freeze cycle.
• 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. If single float, 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. and occurs 1 time only.
During the 1-min. refill, LED 4 is on.
S5 Dip Switch Setting
No. 1
Upper or Lower Float Switch Control
OFF
Lower Float Switch Control
ON
Upper Float Switch Control
(this setting is ignored if refill counter
(S5 dip switch 2 and 3) set to 0)
42
10. Refill Counter (S5 dip switch 2 and 3)
The refill counter determines the number of refills. The KMS‑1122MLJ does not refill
during the freeze cycle.
NOTICE
Do not adjust. These must be left in the factory default position or the icemaker will
not operate correctly.
S5 Dip Switch Setting
Refill
Counter
No. 2
No. 3
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)
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.
NOTICE
Factory set for proper operation. Do not adjust. Adjustment outside the factory
default setting may adversely affect performance and warranty coverage.
S5 Dip Switch Setting
No. 5
Anti-Slush
OFF
Disabled
ON
Enabled
43
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.
• Before servicing the KMS or SRK: Move the KMS 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.
• 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.
44
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 shutoff 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, then open the high and
low-side refrigerant shutoff valves. Never allow the oil in the vacuum pump to flow
backwards.
45
3) Allow the vacuum pump to pull down to a 29.9" Hg vacuum. Evacuating period depends
on pump capacity.
4) Close the low-side valve and high-side valve on the gauge manifold.
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 nameplate on the condensing unit
or 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 shutoff valve with the icemaker running.
9) Close the high and low-side refrigerant shutoff valves. Close the high and low-side
gauge manifold valves, then disconnect the gauge manifold hoses.
10) Cap the refrigerant shutoff valves to prevent a possible leak.
46
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.
47
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 the KMS or SRK: Move the KMS 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.
• 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
Monthly
Clean the ice scoop using a neutral cleaner. Rinse thoroughly after
cleaning.
Check for proper pressure and change if necessary.
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.
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
48
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. Remove the water from the icemaker water line:
1) Turn off the power supply, then remove the front panel.
2) Close the icemaker water supply line shut-off valve and open the icemaker water supply
line drain valve.
3) Allow the line to drain by gravity.
4) Attach a compressed air or carbon dioxide supply to the icemaker water supply line
drain valve.
5) Make sure at least 3 min. have elapsed since you turned off the power supply. Make
sure the control switch is in the "ICE" position. Replace the front panel in its correct
position, then turn on the power supply.
6) Blow the icemaker water supply line out using the compressed air or carbon dioxide
supply.
7) Close the icemaker water supply line drain valve.
2. Remove the water from the water tank:
1) Turn off the power supply.
2) Remove the front, apron, top, left side, and side insulation panels.
3) Move the control switch to the "OFF" position.
4) Remove the drain plug. Allow the water tank to drain.
5) Replace the drain plug in its correct position. Be careful not to cross thread the drain
plug.
6) Replace the side insulation, left side, top, apron, and front panels in their correct
positions.
7) Remove all ice from the dispenser unit/ice storage bin. Clean the dispenser unit/ice
storage bin using a neutral cleaner. Rinse thoroughly after cleaning.
49
VII. Disposal
The appliance contains refrigerant and must be disposed of in accordance with
applicable national, state, and local codes and regulations. Refrigerant must be
recovered by properly certified service personnel.
50
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 boldshould be
used for reference only.
1. KMS-1122MLJ with SRK-12J
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
Performance Data Sheet
APPROXIMATE ICE PRODUCTION
PER 24 HR.
lbs./day kg./day
APPROXIMATE ELECTRIC
CONSUMPTION
watts
APPROXIMATE WATER
CONSUMPTION PER 24 HR.
3
gal./day m /day
FREEZING CYCLE TIME
min.
HARVEST CYCLE TIME
min.
HEAD PRESSURE
PSIG kg/cm2G
SUCTION PRESSURE
PSIG
2
kg/cm G
115VAC Supplied by SRK-12J via Factory Supplied Wire Harness
90/70°F
70/50°F
1880 (4.20)
1750 (3.64)
172 (16.0)
335 (29.1)
18.6 lbs. (8.4 kg) 880pcs.
Thermostatic
TOTAL R404A, 16 lb. 5 oz. (7400g)
ICEMAKER, 0 lb. 7.1 oz. (200g)
CONDENSER, 15 lb. 14 oz. (7200g)
AMBIENT TEMP.
(ºF/ºC)
1151
1134
1129
1144
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
WATER TEMP. (ºF/ºC)
70/21
50/10
522
515
512
519
1129
1100
1075
1080
1750
1779
1788
1919
335
298
287
237
TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR
CONDENSER VOLUME
1138
1131
1097
1117
1788
1838
1880
1963
1.27
1.13
1.09
0.90
287
224
172
173
19
19
19
20
5.0
4.5
4.4
3.5
175
188
191
195
40
41
41
44
512
499
488
490
90/32
2065
2240
2234
2560
1.09
0.85
0.65
0.65
274
240
176
179
19
21
22
22
4.4
3.5
2.7
2.6
12.3
13.2
13.5
13.7
2.8
2.9
2.9
3.1
191
213
231
236
41
43
44
46
516
513
498
507
1.04
0.91
0.66
0.68
21
23
24
26
3.9
3.2
2.4
2.0
13.5
15.0
16.2
16.6
2.9
3.0
3.1
3.2
212
232
251
270
48
52
52
60
14.9
16.3
17.7
19.0
3.4
3.7
3.7
4.2
16,500 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
2,300 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
226 CU. IN. (SRK12J)
51
2. KMS-1122MLJ with SRK-12J3
Specification Sheet
AC SUPPLY VOLTAGE
115VAC Supplied by SRK-12J3 via Factory Supplied Wire Harness
90/70°F
70/50°F
ELECTRIC & WATER CONSUM
1850 (4.05)
1730 (3.60)
ELECTRIC W (kWH/100 lb
176 (16.0)
338 (29.3)
WATER gal./24HR (gal./100
ICE PRODUCTION PER CYCL 18.6 lbs. (8.4 kg) 880pcs.
BIN CONTROL SYSTEM
Thermostatic
REFRIGERANT CHARGE
TOTAL R404A, 16 lb. 5 oz. (7400g)
ICEMAKER, 0 lb. 7.1 oz. (200g)
CONDENSER, 15 lb. 14 oz. (7200g)
Performance Data Sheet
APPROXIMATE ICE
PRODUCTION PER 24 HR.
lbs./day kg./day
APPROXIMATE ELECTRIC
CONSUMPTION
watts
APPROXIMATE WATER
CONSUMPTION PER 24 HR.
gal./day m3/day
FREEZING CYCLE TIME
min.
HARVEST CYCLE TIME
min.
HEAD PRESSURE
PSIG kg/cm2G
SUCTION PRESSURE
PSIG
kg/cm2G
AMBIENT TEMP.
(ºF/ºC)
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
70/21
80/27
90/32
100/38
50/10
1151
1140
1136
1144
522
517
515
519
1730
1757
1765
1834
338
302
290
240
1.28
1.14
1.10
0.91
19
19
19
20
5.1
4.6
4.4
3.6
179
190
194
198
42
43
43
46
12.6
13.4
13.6
13.9
3.0
3.0
3.0
3.2
TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR
CONDENSER VOLUME
WATER TEMP. (ºF/ºC)
70/21
1136
515
1116
506
1100
499
1102
500
1765
1811
1850
1896
290
1.10
228
0.86
176
0.66
176
0.67
19
21
21
22
4.4
3.5
2.8
2.7
194
13.6
214
15.0
230
16.2
235
16.5
43
3.0
45
3.1
46
3.2
48
3.4
90/32
1138
1131
1109
1117
516
513
503
507
1924
2032
2048
2230
276
242
177
179
1.04
0.91
0.67
0.68
22
23
24
26
3.9
3.2
2.4
2.0
214
234
251
270
49
53
53
60
15.1
16.5
17.6
19.0
3.4
3.7
3.7
4.2
17,300 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
2,300 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
226 CU. IN. (SRK12J3)
52
ENG.F-011.1.0205
3. SRK-12J
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)
11.6 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 CS12K6E-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
Line set HS-0250, HS-0251, HS-0252
TOTAL HEAT OF REJECTION FROM CONDENSER
16,500 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
TOTAL HEAT OF REJECTION FROM COMPRESSOR
2,300 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
CONDENSER VOLUME
226 CU. IN.
53
4. SRK-12J3
Specifications 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)
10.5 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 CS12K6E-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
Line set HS-0250, HS-0251, HS-0252
TOTAL HEAT OF REJECTION FROM CONDENSER
17,300 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
TOTAL HEAT OF REJECTION FROM COMPRESSOR
2,300 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]
CONDENSER VOLUME
226 CU. IN.
54
55
V
V
P
P
BK
BK
W GR
GR
Neutral
W
HGV LLV
Contactor
Fuse 10A
BR
BR
Wire Color Code:
BK-black
BR-brown
GR-green
P-pink
V-violet
W-white
GND
SRK Condensing Unit
(field connected)
Legend:
CB-control board
GND-ground
HGV-hot gas valve
LLV-liquid line valve
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
56
426±22
0 PSIG
341±22 PSIG
Cut-in
** Discharge Line Thermostat
Cut-in
239°F±9°F (115°C±5°C)
Cut-out 266°F±9°F (130°C± 5°C)
*
Cut-out
*High-Pressure Switch
**
Auxiliary Code H-1 and Later
Auxiliary Code H-0
2. KMS-1122MLJ with SRK-12J
57
426± 0 PSIG
341±22 PSIG
Cut-out
Cut-in
22
*High-Pressure Switch
Cut-in
239°F±9°F (115°C±5°C)
Cut-out 266°F±9°F (130°C± 5°C)
** Discharge Line Thermostat
**
Auxiliary Code H-1 and Later
Auxiliary Code H-0
3. KMS-1122MLJ with SRK-12J3
*