Only qualied service technicians should install and service the appliance. To
obtain the name and phone number of your local Hoshizaki Certied Service
Representative, visit www.hoshizaki.com. No installation or service should be
undertaken until the technician has thoroughly read this Service Manual. Likewise,
the owner/manager should not proceed to operate the appliance until the installer
has instructed them on its proper operation. Failure to install, operate, and
maintain the appliance in accordance with this manual will adversely affect safety,
performance, component life, and warranty coverage and may result in costly water
damage. Proper installation is the responsibility of the installer. Product failure or
property damage due to improper installation is not covered under warranty.
Hoshizaki provides this manual primarily to assist qualied service technicians in the
installation, maintenance, and service of the appliance.
Should the reader have any questions or concerns which have not been satisfactorily
addressed, please call, send an e-mail message, or write to the Hoshizaki Technical
Support Department for assistance.
618 Highway 74 South
Peachtree City, GA 30269
Attn: Hoshizaki Technical Support Department
NOTE: To expedite assistance, all correspondence/communication MUST include the
following information:
• Model Number
• Serial Number
• Complete and detailed explanation of the problem.
2
IMPORTANT
This manual should be read carefully before the appliance is serviced. Read
the warnings and guidelines contained in this manual carefully as they provide
essential information for the continued safe use, service, and maintenance of the
appliance. Retain this manual for any further reference that may be necessary.
CONTENTS
Important Safety Information ................................................................................................. 5
I. Construction and Water/Refrigeration Circuit Diagram ....................................................... 7
A. Construction ................................................................................................................. 7
2. KMS-2000MLJ with SRK-20J ................................................................................ 57
3. KMS-2000MLJ with SRK-20J3 .............................................................................. 58
4
Important Safety Information
Throughout this manual, notices appear to bring your attention to situations which could
result in death, serious injury, damage to the appliance, or damage to property.
WARNING Indicates a hazardous situation which could result in death or
serious injury.
NOTICE Indicates a situation which could result in damage to the
appliance or property.
IMPORTANT Indicates important information about the use and care of the
appliance.
WARNING
This appliance should be destined only to the use for which it has been expressly
conceived. Any other use should be considered improper and therefore dangerous.
The manufacturer cannot be held responsible for injury or damage resulting from
improper, incorrect, and unreasonable use. Failure to service and maintain the
appliance in accordance with this manual will adversely affect safety, performance,
component life, and warranty coverage and may result in costly water damage.
To reduce the risk of death, electric shock, serious injury, or re, follow basic
precautions including the following:
• Only qualied service technicians should install and service this appliance.
• This appliance must be installed in accordance with applicable national, state, and
local codes and regulations. Failure to meet these code requirements could result in
death, electric shock, serious injury, re, or damage to the appliance.
• To reduce the risk of electric shock, do not touch the control switch or service switch
with damp hands.
• Before Servicing the KMS or SRK: To reduce the risk of electric shock, move
the control switch to the "OFF" position and turn off the power supply to the
SRK condensing unit. Place the KMS disconnect (if applicable) in the "OFF"
position. Lockout/Tagout to prevent the power supply from being turned back on
inadvertently.
• Do not make any alterations to the appliance. Alterations could result in electric
shock, injury, re, or damage to the appliance.
• This appliance is not intended for use by persons (including children) with reduced
physical, sensory, or mental capabilities, or lack of experience and knowledge,
unless they have been given supervision or instruction concerning use of the
appliance by a person responsible for their safety.
• Children should be properly supervised around this appliance.
• Do not climb, stand, or hang on the appliance or allow children or animals to do so.
Serious injury could occur or the appliance could be damaged.
• Do not use combustible spray or place volatile or ammable substances near the
appliance. They might catch re.
• Keep the area around the appliance clean. Dirt, dust, or insects in the appliance
could cause harm to individuals or damage to the appliance.
5
WARNING, continued
For KMS
• Power supply and ground connection are supplied from the SRK remote condensing
Failure to properly ground the appliance
• Risk of electric shock. Control switch in "OFF" position does not de-energize all
loads.
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, re, or damage to
the appliance.
• THE APPLIANCE MUST BE GROUNDED.
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, re, or damage to the appliance.
• The remote condensing unit requires an independent power supply of proper
capacity. See the nameplate for electrical specications. Failure to use an
independent power supply of proper capacity can result in a tripped breaker, blown
fuses, damage to existing wiring, or component failure. This could lead to heat
generation or re.
• THE 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 oor
drain.
• Install the appliance in a location that stays above freezing. Normal operating
ambient temperature must be within 45°F to 100°F (7°C to 38°C).
• Do not leave the appliance on during extended periods of non-use, extended
absences, or in sub-freezing temperatures. To properly prepare the appliance for
these occasions, follow the instructions in "VI. Preparing the Appliance for Periods
of Non-Use."
• Do not place objects on top of the appliance.
• The dispenser unit/storage bin is for ice use only. Do not store anything else in the
dispenser unit/storage bin.
6
I. Construction and Water/Refrigeration Circuit Diagram
A. Construction
1. Icemaker
Top Panel
Top Insulation
Inlet Water Valve
Spray Guides
Spray Tubes
Insulation Panel
Evaporator
Wash Valve
Hot Gas Valve
Strainer
Suction Line
Shutoff Valve
Thermostatic Expansion Valves
Front Panel
Control Switch
Service Switch
Fuse (KMS)
Control Box
Drain Valve
Switch Cover
Switch Mount
Extension Bracket
Bin Control
Control Box
Drier
Float Switch
Liquid Line Valve
Pump Motor
Bin Control
Liquid Line
Shutoff Valve
Thermistor
Left Side Panel
Switch Bracket
7
2. Condensing Unit
Main Transformer
(Three Phase Only)
Control Box
Suction Line
Shutoff Valve
Liquid Line
Shutoff Valve
Fan Motors
Liquid Line
Shutoff Valve 2
High-Pressure
Switch
Compressor
Crankcase Heater
Junction Box
Top Panel
Condenser
Right Side Panel
Louver Panel
Discharge Line Thermostat
Hot Gas Valves
Headmaster
(C.P. R.)
Front Panel
Liquid Line Valve
Strainers
Left Side Upper Panel Right
Left Side Upper
Panel
Accumulator
Receiver
Left Side Lower Panel
8
B. Water Circuit and Refrigeration Circuit
Hot Gas
Headmaster
(C.P. R.)
Discharge Line
Thermostat
Check Valve
Valves
Access Valve
Strainers
Liquid Line
Shutoff Valve 2
High-Pressure
Switch
Discharge
Line
Condenser
SRK-20J/3
Strainer
Fans
Liquid Line
Val ve
Suction Line
Wash Valve
Inlet Water Valve
Shutoff Valves
Liquid Line
Shutoff Valves
Heat Exchanger
Thermistor
Suction Line
Liquid Line
Val ve
Drier
Strainer
Hot Gas
Val ve
Accumulator
Check Valves
Float Switch
Compressor
Receiver
Thermostatic
Drain Valve
Expansion Valves
KMS-2000MLJ
Water Supply
Spray Tube
Evaporator
Drain
Pump Motor
Water Tank
9
II. Sequence of Operation and Service Diagnosis
A. Sequence of Operation Flow Chart
1. Operation Flow Chart
4. Pump-Out Cycle
3. Freeze Cycle
10th cycle.
• Factory set forevery
• Minimum freeze time: 5 min.
• Maximum freeze time: freeze timer setting
(S4 dip switch 5)
(S4 dip switch 9 & 10)
• Pump motor stops for
for 10/20 sec.
2 sec., then energized
(S4 dip switch 3 & 4)
FS in control
5-min. minimum
freeze timer in
control
Comp continues
FMRs continue
HGVs energized
DV energized
PM de-energizes for 2 sec.,
then energized for 10/20 sec.
LLVs de-energized
When freeze time differential exceeded,
freeze-time correction cycle starts.
See "II.A.3. Freeze-Time Correction Chart."
FS opens or freeze
timer terminates
50 sec.
FS closed
F/S check
Anti-Slush
Comp continues
Thermistor
FMRs continue
temperature
PM continues
drops to 36°F
LLVs energized
(2.2°C) (5.8 kΩ
HGVs de-energized
or more).
F/S open
PM de-energizes
for 10 sec.
Power is supplied to the pump motor and drain valve. This drains the water tank.
Power is supplied to the pump motor only. This operation can be used to circulate cleaner
and sanitizer over the outside surface of the evaporator for extended periods of time.
Power is supplied to the pump motor and wash valve. This operation is used to circulate
cleaner and sanitizer over both the inside and outside surfaces of the evaporator.
Operation Flow Chart
HarvestPump Timer
Components Energized when the Control Switch is in the "SERVICE" Position
PM energized
F/S check
begins
here after
WV continues
WV energized
5-sec. delay
WV de-energized
Comp energized
Thermistor temperature
reaches 48°F (9°C)
FMRs energized
HGVs energized
F/S open
(3.9 kΩ or less)
Harvest timer starts.
If F/S is open, Comp and FMRs de-energize and cycle returns to 1-minute ll cycle
1 to 3-min. timer in control
(S4 dip switch 1 & 2)
HPT settings (S4 dip switch 6), whichever is
shorter.
• WV time: 6 min. or the length of harvest minus
• Maximum harvest time: 20 min.
2. Harvest Cycle
1. 1-Minute
Fill Cycle
Cycle
Steps
Thermistor
in control
F/S closed
Startup
DRAIN
When in the "SERVICE" position, the control switch supplies power to the service switch and the icemaker is in service mode.
Legend:
BC-bin control
CIRC.
The service switch has three positions: "DRAIN," "CIRC." and "WASH." See the information below for details of each function.
Comp-compressor
DV- drain valve
FMRs-fan motors-remote
F/S-oat switch
WASH
HGVs-hot gas valves (KMS and SRK)
LLVs-liquid line valves (KMS and SRK)
PM-pump motor
WV-inlet water valve
10
2. Shutdown Flow Chart
3. Ice Level Lowered
Icemaker starts at
To 1. 1-Minute Fill Cycle
"1. 1-Minute Fill Cycle."
BC closed
(BC actuator paddle disengaged)
Green "BC CLOSED" LED on
Yellow "BC OPEN" LED off
2. Icemaker Off
All components
de-energized.
Yellow "BC OPEN" LED continues.
All components de-energized.
Shutdown Flow Chart
Control board retains freeze-time correction count data
between bin control restarts.
to 15 sec. into the freeze cycle if
activated at the end of the harvest cycle.
15 sec. before the 5-min. short cycle
protection timer terminates.
Otherwise, at the end of the next harvest
cycle.
BC open (BC actuator paddle engaged)
Green "BC CLOSED" LED off
Yellow "BC OPEN" LED on
Legend:
BC–bin control
1. Bin Full
Shutdown Delay:
• Fill Cycle–15 sec. after activation.
• Harvest Cycle–At the end of the harvest cycle, or up
• Freeze Cycle– 15 sec. after activation if activated at least
Shutdown
and Restart
BC Operation
11
3. Freeze-Time Correction Chart
Overow
2. 10-Minute Fill/
WV energized
Comp de-energized
FMRs de-energized
HGVs de-energized
PM de-energized
After 5th 10-Minute Harvest Pump Cycle with WV
Freeze-Time Correction Cycle Complete.
Go to Step "3. Freeze Cycle" in Operation Flow Chart.
step 1 for 5th and nal time.
• Do not adjust S4 dip switch 7 out of the factory position.
• After step 2 completes 4th sequence (80 min. completed), repeat
1. 10-Minute Harvest Cycle with WV
Comp energized
FMRs energized
HGVs energized
PM energized
WV energized
Freeze-Time Correction Flow Chart
CycleSteps
Steps 1 and 2 repeat
4 times (total 80 min.),
then step 1 repeats for
a 5th time to complete
Freeze-Time Correction
Start
Legend:
Comp–compressor
FM–fan motor
FMRs–fan motor-remote
HGVs–hot gas valve
PM–pump motor
WV–inlet water valve
Appliance Cycle Reset and Alarm Reset:
Cycle Reset: Power Supply or Control Switch Turned Off and On again:
Appliance turns off, then re-starts at 1.Fill Cycle.
Alarm Reset: CB "ALARM RESET" pressed during or after a freeze-time
correction cycle with power supply on:
Appliance continues cycle with no interruption or reset.
CB red "POWER OK" LED blinking:
CB red "POWER OK" LED resets to solid.
CB yellow "EXT HARVEST" LED blinking:
Cycle.
Differential
Value in Sec.
3254
4309
5349
6380
7406
8427
9446
10462
CB yellow "EXT HARVEST: LED turns off.
Number of
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 3freeze
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:
Freeze Cycles
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
36hours, 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.
12
B. Service Diagnosis
WARNING
• The appliance should be diagnosed and repaired only by qualied service
personnel to reduce the risk of death, electric shock, serious injury, or re.
• Risk of electric shock. Control switch in "OFF" position does not de-energize all
loads. Use extreme caution and exercise safe electrical practices.
• Moving parts (e.g., fan blade) can crush and cut. Keep hands clear.
• Before servicing the appliance, move the control switch to the "OFF" position and
turn off the power supply.
• CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are
securely in place after the appliance is serviced. Make sure that none have fallen
into the dispenser unit/ice storage bin.
• Make sure all food zones in the appliance and dispenser unit/ice storage bin are
clean after service.
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 conrm 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
K1connector 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.
Conrm that the location meets installation requirements:
KMS-2000MLJ:
• The appliance is not intended for outdoor use. Normal operating ambient temperature
should be within 45°F to 100°F (7°C to 38°C).
• Allow 6" (15 cm) clearance at sides, rear, and top of the appliance for proper air
circulation and ease of maintenance and service.
• The appliance should not be located in a corrosive environment.
SRK-20J/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, conrm 10A fuse on
both the KMS and the SRK are good. Conrm 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 #1 (BR) to neutral (W) then at control switch
#2(BK) to neutral (W). If 115VAC is present on #1 (BR) and not on #2 (BK), replace
control switch. If 115VAC is present on control switch #2 (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 tting.
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.
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 lters are clear. Check for
115VAC at CB K1 #6 (O) to neutral (W). If 115VAC is not present, replace CB. If 115VAC
is present, and WV does not energize, check for 115VAC at WV. If 115VAC is present,
check WV coil continuity. Ifopen, replace WV. If the water tank lls, 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.
14
5a) Initial Harvest Cycle – LEDs 1, 4, and 2 are on. WV and X11 relay continue. Comp,
FMRs, HGVs, and X10 relay energize. CBmonitors 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. Ifnot, conrm 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). If115VAC 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.
If115VAC is present, conrm contacts are closed. If not, replace MC. If MC contacts
are closed, check Comp start and run capacitors, start relay (single phase), and
Comp motor winding.
b) HGVs Diagnosis: If Comp is energized and evaporator is not warming, check
that HGVs energizes and open. Check for 115VAC at CB K1 #2 (P) to neutral (W).
If115VAC 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: Conrm that both LLVs are de-energized (KMS and SRK) and
closed (not bypassing). Ifenergized, replace CB. If de-energized and bypassing,
replace LLVs (KMS and SRK).
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 and X12 relay energize.
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? Conrm 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). If115VAC 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 3is on and PM is not energized, check for 115VAC at CB K1 #5(DBU). If115VAC
is not present, replace CB. If 115VAC is present and PM is not energized, check for
115VAC at X10relay 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 X12 relay terminal #8 (P) and PM is not energized,
check for 115VAC at X12 relay terminal #4 (W/R) to neutral (W) and terminal #6 (DBU)
to neutral (W). If 115VAC is present on terminal #6(DBU) and not on terminal #4 (W/R),
replace X12relay. If 115VAC is present on X12relay terminal #4(W/R). If 115VAC is
present between X12 relay terminal #4 (W/R) and neutral (W), check PM capacitor and
motor winding continuity.
15
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. ll 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.
Ifnot, 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, X10 and X12 relays de-energize. Appliance is held in freeze by a 5-min. short
cycle protection timer. After 5-min. short cycle protection timer terminates and FS opens,
freeze cycle terminates.
Note: PM power supply switches from CBK1 #5(DBU) in HPT 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) (5.8 kΩ) for 10 sec. then, energizes for the remainder
of the freeze cycle.
a) Freeze Cycle Diagnosis: Conrm Comp, FMRs, and PM continue. Conrm that
LLVs energize. Next, conrm HGVs, X10 and X12 relays de-energize. During the
rst 5 min. of freeze, conrm evaporator is cooling. If not, conrm 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. Specication 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). If115VAC
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. Specication 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.
16
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: Conrm water is owing over evaporator from PM and not WV.
IfPM 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). If115VAC is present at CB K1 #4 (R) and not at control switch #5 (W/R),
check control switch continuity between #5 (W/R) and #4 (R). Replace as needed.
If115VAC 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. Specication and Performance Data
Sheets." Next, check HM operation. If refrigeration pressures are above HM setpoint
and HMis bypassing, replace HM. Check TXV for proper operation. Remove TXV
bulb and hold it in your hand, refrigerant low-side pressure should rise, place
TXV bulb in ice water, refrigerant low-side pressure should drop. A 10 to 15 pound
pressure swing between warm and cold conditions indicate a good TXV. If a 10 to 15
pound swing is not present, replace TXV.
g) Freeze Termination Diagnosis: After 5 min. in freeze, disconnect CB K5 FS
connector. 15 sec. later appliance should switch out of the freeze cycle (15 second
delay after FS opens before terminating the freeze cycle). If appliance remains in
freeze longer than 15 sec. after FS removed, replace CB. If appliance switches with
FS removed but would previously not switch out of freeze with FS connected (long
freeze - 3 beep alarm), see "II.F. Float Switch Check and Cleaning."
Note: Normal freeze cycle will last 20 to 40 min. depending on model and conditions.
Cycle times and pressures should follow performance data provided in this manual.
See "VIII.A. Specication and Performance Data Sheets."
h) Short Freeze Cycle Diagnosis: Conrm water tank lls and overows during 1 min.
ll and harvest cycles. If not, check water supply lters, shut-off valve, WV screen.
Ifwater tank empties before 5 min. timer terminates and freeze cycle is short, check
that DV is not leaking by or energized (water owing through DV). If DV is leaking by,
remove and clean DV, replace as needed. If water tank is full, see "II.F. Float Switch
Check and Cleaning." for erratic operating FS.
17
7) Pump-Out Cycle – LEDs 1, 3, and 2 are on (10/20 second pump-out). Timing of the
rst pump-out is determined by S4 dip switch 5. See the table below.
Control Board Settings
S4 Dip Switch Setting
No. 5
OFFEvery 10 cyclesAfter 11th freeze cycle
ONEvery cycleAfter 2nd freeze cycle
Pump-Out FrequencyControl Board
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!S4dip 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 energizing.
LLVs de-energize. PM stops for 2 sec., then restarts for 10/20 sec. depending on
pump-out timer (S4dip 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
5min. of freeze disconnect CB black K5 connector (FS connector). Check that CB
LEDs 1, 3, and 2are on, PM stops, then restarts, DV energizes, and water is owing
down the drain through DV.
b) CB Diagnosis: Conrm 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. Ifnot, replace CB. IfLEDs 1, 3, and 2 are on
and X12 relay is not energized, check for 115VAC at CB K1 #5 (DBU) to neutral(W).
If115VAC is not present, replace CB. If115VAC 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 are not energized, check for 115VAC at X12 relay #8 (P) to
neutral (W). If115VAC is not present, check wiring connections from CB K1 #5 (DBU)
to X12 relay #6 (DBU), then at X12 relay #4 (W/R). If 115VAC is present at X12 relay
#6 (DBU) and not at X12 relay #4 (W/R), conrm X12 relay is de-energized, if X12
relay is de-energized, replace X12 relay (sticking contacts). If 115VAC is present
at X12 relay #5 (DBU) to neutral (W), and X12 is de-energized, check relay coil
continuity. Replace as needed.
18
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