Hoshizaki KMS1402MLJ User Manual
Service Manual
Modular Crescent Cuber
Model
KMS-1402MLJ
Including
Condensing Unit Models
SRK-15J/3
hoshizakiamerica.com
Number: 73224
Issued: 5-16-2018
WARNING
Only 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.
Phone: 1-800-233-1940; (770) 487-2331
Fax: 1-800-843-1056; (770) 487-3360
E-mail: techsupport@hoshizaki.com
618 Highway 74 South
Peachtree City, GA 30269
Attn: Hoshizaki Technical Support Department
NOTE: To expedite assistance, all correspondence/communication MUST include the
following information:
• Model Number
• Serial Number
• Complete and detailed explanation of the problem.
2
IMPORTANT
This manual should be read carefully before the icemaker is serviced. Read
the warnings and guidelines contained in this booklet carefully as they provide
essential information for the continued safe use, service, and maintenance of the
icemaker. Retain this booklet for any further reference that may be necessary.
CONTENTS
Important Safety Information ................................................................................................. 5
I. Construction and Water/Refrigeration Circuit Diagrams ..................................................... 7
A. Construction ................................................................................................................. 7
1. Icemaker ................................................................................................................. 7
2. Condensing Unit ..................................................................................................... 8
B. Water Circuit/Refrigeration Circuit Diagram ................................................................... 9
II. Sequence of Operation and Service Diagnosis ............................................................... 10
A. Sequence of Operation Flow Chart ............................................................................. 10
1. Operation Flow Chart ............................................................................................ 10
2. Shutdown Flow Chart .............................................................................................11
3. Freeze-Time Correction Chart ............................................................................... 12
B. Service Diagnosis ....................................................................................................... 13
C. Freeze-Time Correction Cycle (90 min.) ..................................................................... 22
D. Control Board Check ................................................................................................... 24
E. Bin Control Check ....................................................................................................... 26
F. Float Switch Check and Cleaning ................................................................................ 28
G. Thermistor Check ........................................................................................................ 30
H. Switches ...................................................................................................................... 31
1. Control Switch ........................................................................................................ 31
2. Service Switch ....................................................................................................... 31
I. Diagnostic Tables .......................................................................................................... 32
J. Freeze-Up Check List .................................................................................................. 36
III. Settings and Adjustments ............................................................................................... 37
A. Control Board Layout .................................................................................................. 38
B. LED Lights and Audible Alarm Safeties ....................................................................... 39
C. Settings and Adjustments ............................................................................................ 40
1. Default Dip Switch Settings .................................................................................... 40
2. Harvest Time (S4 dip switch 1 & 2)........................................................................ 41
3. Pump-Out Time/Harvest Time During Pump-Out (S4 dip switch 3 & 4) ................. 41
4. Pump-Out Frequency Control (S4 dip switch 5) ..................................................... 42
5. Harvest Pump Time (Harvest Assist Duration) (S4 dip switch 6) ........................... 42
6. Harvest Pump Time (Harvest Assist)/Freeze-Time Correction (S4 dip switch 7) .. 43
7. Factory Use (S4 dip switch 8)................................................................................. 43
8. Freeze Timer (S4 dip switch 9 & 10) ...................................................................... 44
9. Float Switch Control Selector (S5 dip switch 1) ..................................................... 44
10. Rell Counter (S5 dip switch 2 and 3) .................................................................. 45
11. Minimum Harvest Time (S5 dip switch 4) ............................................................. 45
12. Anti-Slush (S5 dip switch 5) ................................................................................. 45
3
IV. Refrigeration Circuit and Component Service Information.............................................. 46
A. Refrigeration Circuit Service Information .................................................................... 46
B. Component Service Information .................................................................................. 49
V. Maintenance .................................................................................................................... 50
VI. Preparing the Appliance for Periods of Non-Use ............................................................ 51
VII. Disposal ......................................................................................................................... 53
VIII. Technical Information .................................................................................................... 54
A. Specication and Performance Data Sheets ............................................................... 54
1. KMS-1402MLJ with SRK-15J ................................................................................. 54
2. KMS-1402MLJ with SRK-15J3 .............................................................................. 55
3. SRK-15J ................................................................................................................ 56
4. SRK-15J3 .............................................................................................................. 57
B. Wiring Diagrams .......................................................................................................... 58
1. Wire Harness Connections ..................................................................................... 58
2. KMS-1402MLJ with SRK-15J ................................................................................ 59
3. KMS-1402MLJ with SRK-15J3 .............................................................................. 60
4
Important Safety Information
Throughout this manual, notices appear to bring your attention to situations which could
result in death, serious injury, damage to the appliance, or damage to property.
WARNING Indicates a hazardous situation which could result in death or
serious injury.
NOTICE Indicates a situation which could result in damage to the
appliance or property.
IMPORTANT Indicates important information about the use and care of the
appliance.
WARNING
This appliance should be destined only to the use for which it has been expressly
conceived. Any other use should be considered improper and therefore dangerous.
The manufacturer cannot be held responsible for injury or damage resulting from
improper, incorrect, and unreasonable use. Failure to service and maintain the
appliance in accordance with this manual will adversely affect safety, performance,
component life, and warranty coverage and may result in costly water damage.
To reduce the risk of death, electric shock, serious injury, or 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 Diagrams
A. Construction
1. Icemaker
Harvest Water Valve (WV2)
Evaporator
Spray Tubes
Wash Valve
Hot Gas Valve
Liquid Line Valve
Liquid Line
Shutoff Valve
Drier
Suction Line
Shutoff Valve
Thermistor
Control Board
Control Box
Fill/Rell Water Valve (WV1)
Control Switch
Service Switch
Drain Water Valve
Fuse
Switch Box
Switch Cover
Switch Mount
Extension Bracket
Bin Control
Pump Motor
Float Switch
Bin Control
Switch Bracket
7
2. Condensing Unit
Liquid Line Valve
Suction Line
Shutoff Valve
Liquid Line
Shutoff Valve
SRK-15J Control Box
Headmaster (C.P.R.)
Fuse
Condenser
Hot Gas Valves
SRK-15J3 Control Box
Fuse
Check Valve
Receiver
Accumulator
Fan Motors and Fan Blades
Liquid Line Shutoff Valve 2
Discharge Line Shutoff Valve
Thermostat (Discharge Pipe)
Crankcase Heater
Compressor
High Pressure Switch
8
B. Water Circuit/Refrigeration Circuit Diagram
Discharge Line
Shutoff Valve
Discharge Line
Headmaster
(C.P. R.)
Condenser
Check Valve
Access Valve
Thermostat
Strainers
Hot Gas Valves
Liquid Line Valve
Service Valve
Strainer
High-Pressure
Switch
SRK-15J/3
Wash Valve
Drier
Liquid Line Valve Body
Receiver
Fan
Suction Line
Thermistor
Liquid Line
Shutoff Valve
Service Valve
Service Valve
Liquid Line
Shutoff Valve
Strainer
Discharge
Line
Hot Gas
Valve Body
Compressor
Accumulator
Check Valves
Float Switch
Expansion Valves
Drain Valve
Water Supply
KMS-1402MLJ
Harvest Water
Valve (WV 2)
Spray Tube
Evaporator
Fill/Rell Water
Valve (WV (WV 1)
9
Drain
Pump Motor
Water Tank
II. Sequence of Operation and Service Diagnosis
A. Sequence of Operation Flow Chart
1. Operation Flow Chart
cycle
(S4 dip switch 5)
4. Pump-Out Cycle
• Factory set for every 10th
FS in control
FS opens or freeze
timer terminates
Comp energized
FMRs energized
HGVs energized
DV energized
PM stops for 2 sec., then
Anti-Slush
Thermistor temperature
reaches 36°F (2.2°C)
(5.8 kΩ).
PM de-energized for
energized for 10/20 sec.
LLV de-energized
10 sec.
When freeze time differential exceeded,
freeze-time correction cycle starts.
See "II.A.3. Freeze-Time Correction Chart."
• Min. freeze time: 5 min.
• Max. freeze time: freeze timer setting
(S4 dip switch 9 & 10).
5-min minimum
freeze timer in
control
3. Freeze Cycle
Harvest Pump
Time
Operation Flow Chart
1 to 3-min. harvest timer in
control (S4 dip switch 1 & 2)
Thermistor
in control
setting (S4 dip switch 6), whichever is shorter.
• WV time: 6 min. or the length of harvest minus HPT
• Max. harvest time: 20 min.
2. Harvest Cycle
Rell
1 min.
50 sec.
FS closed
FS check
PM energized
WV2 de-energized
FS closed
Comp energized
FMRs energized
Thermistor temperature reaches
Comp energized
FMRs energized
PM energized
48°F (9°C) (3.9 kΩ or less). Harvest
HGVs energized
LLVs energized
WV1 energized rst
1 min. of freeze
HGVs de-energized
FS open
Power is supplied to the pump and drain valve. This drains the water tank.
Power is supplied to the pump only. This operation can be used to circulate cleaner and
sanitizer over the outside surface of the evaporator for extended periods of time.
Power is supplied to the pump and wash valve. This operation is used to circulate cleaner
and sanitizer over both the inside and outside surfaces of the evaporator.
DRAIN
CIRC.
Components Energized when the Control Switch is in the "SERVICE" Position
When in the "SERVICE" position, the control switch supplies power to the service switch and the icemaker is in service mode.
timer starts.
WV2 energized
WV1 de-energized
The service switch has three positions: "DRAIN," "CIRC." and "WASH." See the information below for details of each function.
WASH
WV1 energized
FS open
If FS is open, Comp stops and cycle
returns to 1-Min. ll.
Legend:
Comp-compressor
DV-drain valve
FMRs-fan motors-remote
F/S-oat switch
HGVs-hot gas valves (KMS and SRK)
LLVs-liquid line valves (KMS and SRK)
PM-pump motor
WV1-ll/rell water valve
WV2-harvest water valve
Fill Cycle
FS check
1. 1-Minute
10
Cycle
Steps
Startup
2. Shutdown Flow Chart
3. Ice Level Lowered
2. Icemaker Off
Icemaker starts at
All components
"1. 1-Minute Fill Cycle."
de-energized.
To 1. 1-Minute Fill Cycle
BC closed
(BC actuator paddle disengaged)
Green "BC CLOSED" LED on
Yellow "BC OPEN" LED off
Yellow "BC OPEN" LED continues. All
components de-energized.
Shutdown Flow Chart
Note: 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.
• Freeze Cycle–15 sec. after activation if activated at least
BC open (BC actuator paddle engaged)
Green "BC CLOSED" LED off
Yellow "BC OPEN" LED on
BC Operation
Legend:
BC–bin control
1. Bin Full
Shutdown
Shutdown Delay:
and Restart
• Fill Cycle–15 sec. after activation.
• Harvest Cycle–At the end of the harvest cycle, or up
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
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
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.
3 254
4 309
5 349
6 380
7 406
8 427
9 446
10 462
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
• This 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. Use extreme caution and exercise safe electrical practices.
• Risk of electric shock. Control switch (KMS) in "OFF" position does not
de-energize all loads.
• Moving parts (e.g., fan blade) can crush and cut. Keep hands clear.
• CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are
securely in place after the appliance is serviced. Make sure that none have fallen
into the dispenser unit/storage bin.
• Make sure all food zones in the icemaker and dispenser unit/storage bin are clean
after service. For cleaning procedures, see "V. Maintenance."
1. Diagnostic Procedure
The diagnostic procedure is a sequence check that allows you to diagnose the electrical
system and components. Before proceeding, check for correct installation, proper voltage
per nameplate, and adequate water supply.
Note: • When checking high voltage (115VAC), always choose a neutral (W) to establish
a good neutral connection.
• On 3-phase models, the neutral (W) is provided through MT. To 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-1402MLJ:
• The appliance is not intended for outdoor use. Normal operating ambient temperature
should be within 45°F to 100°F (7°C to 38°C).
• No clearance is required for proper operation
• The appliance should not be located in a corrosive environment.
SRK-15J/3:
• A dry and well ventilated area with 24" (61 cm) clearance in both front and rear for
proper air circulation and ease of maintenance and/or service should they be required.
13
3) Power On: Turn on the power supply, then move the control switch to the "ICE" position.
A 5-sec. delay occurs. CB red "POWER OK" LED and CB green "BC CLOSED" LED
turn on. If CB yellow "BC OPEN" LED is on (indicating a full bin), check BC. Move ice
away from BC actuator paddle. If CB yellow "BC OPEN" LED stays on, see"II.E.1. Bin
Control Check."
Note: • CB red "POWER OK" LED remains on unless the 10.5VAC power supply is
interrupted (K2 connector).
• Check CB using the steps in "II.D. Control Board Check."
• Conrm CB green "BC CLOSED" LED is on. If CB yellow "BC OPEN" LED is on,
remove ice from BC. If no ice is around BC and CB yellow "BC OPEN" LED is
on, see "II.E.1. Bin Control Check."
a) Power On Diagnosis: If CB red "POWER OK" LED is off, 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, 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 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.
14
4) 1-Min. Fill Cycle – LED 4 is on. WV1 energizes. After 1 min., CB checks for a closed
FS. If FS is closed, the harvest cycle begins. If harvest cycle begins (Comp, HGVs,
and FMRs energized), continue to step 5a. If FS is open, WV1 remains energized until
FS closes (low water safety protection during initial start up and at the end of each
harvest). Diagnosis: Check that water enters the water tank. If not, check that the water
supply line shut-off valve is open and screens or external 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 WV1 does not energize, check for 115VAC at X10 relay terminal #6 (O)
to neutral (W) and X10 relay terminal #2 (W/O) to neutral (W). If 115VAC is present on
relay terminal #6 (O) and not on relay terminal #2 (W/O), check for 115VAC on
X10 relay terminal #8 (P) to neutral (W), if 115VAC is present replace CB. If 115VAC is
not present replace X10 relay. If 115VAC is present, and WV1 does not energize, check
for 115VAC at WV1. If 115VAC is present, check WV1 coil continuity. If open, replace
WV1. If the water tank 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.
5a) Initial Harvest Cycle – LEDs 1, 4, and 2 are on. WV1 continues. Comp, FMRs,
HGVs, WV2, X10 relay, X12 relay, and X13 relay energize. WV1 de-energizes. CB
monitors the warming of the evaporator via the thermistor located on the suction line.
When the thermistor reaches 48°F (9°C), CB reads 3.9 kΩ from the thermistor and
turns harvest termination over to the harvest timer (S4 dip switch 1 & 2 and S5 dip
switch 4). WV2 and X12 relay are energized during harvest for a maximum of 6 min.
or the length of harvest minus HPT setting (S4 dip switch 6), whichever is shorter.
See step 5b below. X13 remains energized throughout harvest cycle to prevent DV
from energizing.
a) Comp Diagnosis: Check that evaporator is warming. If not, 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). 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, 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 energize and open. Check for 115VAC at CB K1 #2 (P) to neutral (W).
If 115VAC is not present, replace CB. If 115VAC is present, check for 115VAC at
HGVs coil (KMS and SRK) and check HGVs coils continuity. Replace as needed.
c) LLVs Diagnosis: Conrm that both LLVs are de-energized (KMS and SRK) and
closed (not bypassing). If energized, replace CB. If de-energized and bypassing,
replace LLVs (KMS and SRK).
15
d) Relays:
1. X10 (WV1 and WV2): If WV1 continues and WV2 does not energize, check for
115VAC between X10 relay terminal #4 (GY) to neutral (W) and X10 relay terminal
#2 (W/O) to neutral (W). If 115VAC is present at relay terminal #2 (W/O) and not
at relay terminal #4 (GY), check for 115VAC at relay terminal #8 (P). If 115 VAC is
present at relay terminal #8 (P) and not at relay terminal #4 (GY), replace relay.
If 115VAC is present at relay terminal #4 (GY) and not at relay terminal #2 (W/O)
and WV1 contines, clean or replace WV1.
2. X12 Relay (DV Lockout relay 1) and X13 Relay (DV Lockout relay 2):
If DV energizes (water owing down the drain) check for 115VAC at X12 relay
terminal #8 (GY) to neutral (W). If 115VAC is not present see "d)1. X10 (WV1 and
WV2)" above. If 115VAC is present, check X12 relay terminal #6 (Y) to neutral (W)
and #4 (P) to neutral (W). If 115VAC is not present from X12 relay terminal #6 (Y)
to neutral (W), check for 115VAC on X10 relay terminal #5 (V) and relay terminal
#3 (Y) to neutral (W). If 115VAC is present on X10 relay terminal #5 (V) and not on
relay terminal #3 (Y) replace X10 relay. If 115VAC is present on relay terminal #6 (Y)
and not on X12 relay terminal #4 (P) replace X12 relay. If 115VAC is present on
X12 relay terminal #4 (P), check for 115 VAC at X13 relay terminal #8 (P) to neutral
(W). If 115VAC is present, check for 115VAC at X13 relay terminal #2 (W/BK) to
neutral (W). If 115VAC is present at X13 relay terminal #2 (W/BK), replace
X13 relay. If 115VAC is not present on X13 relay terminal #2 (W/BK) and water is
going down the drain, clean or replace DV.
3. X11 (DV/HPT relay): If PM energizes during initial harvest, check X11 relay
terminal #8 (DBU) to neutral (W). If 115VAC is present, and CB LED 3 is off, replace
CB. If 115VAC is not present, check for 115VAC at X11 terminal #6 (R) to neutral
(W). If 115VAC is present and CB LED 3 is off, replace X11 relay. Check X11 relay
terminal #5 (W/BU) to neutral (W). If 115VAC is present, check X11 relay terminal
#8 (DBU) to neutral (W). If 115VAC is present on X11 relay terminal #8 (DBU) and
CB LED 3 is off, replace CB.
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5b) Harvest Pump Timer – LEDs 1, 3, and 2 are on. When the thermistor reaches 48°F
(9°C), CB reads 3.9 kΩ from the thermistor and turns harvest termination over to the
harvest timer (S4 dip switch 1 & 2 and S5 dip switch 4). When WV2 de-energizes, LED
4 turns off, X12 relay de-energizes. LED 3 turns on and X11 relay energizes, allowing
PM to energize. Comp, FMRs, HGVs, X10, and X13 relays continue.
Diagnosis: Place a thermometer on the suction line next to the thermistor. Has it
warmed to 48°F (9°C) or warmer? 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 WV2 continues, check for 115VAC
at CB K1 #6 (O) to neutral (W). If 115VAC is present, and LED 4 is off, replace CB.
If 115VAC is not present, and WV2 continues, check WV2 diaphragm for leaking by.
Clean or replace. If LED 3 is on and PM is not energized, check for 115VAC at X11 relay
terminal #8 (DBU) to neutral (W). If 115VAC is not present at X11 terminal relay
#8 (DBU), replace CB. If 115VAC is present, check for 115VAC at X11 relay terminal
#4 (P) to neutral (W) and X11 relay terminal #6 (R). If 115VAC is present at X11 relay
terminal #4 (P) and not at X11 relay terminal #6 (R), replace X11 relay. If 115VAC is
present at X11 relay terminal #6 (R), check control switch contact continuity between
terminals #6 (R) and #5 (W/R). If contacts are open, replace control switch. If contacts
are closed and 115VAC is present between control switch terminal #5 (W/R) and neutral
(W), check PM capacitor and motor winding continuity.
5c) Initial Harvest Cycle Termination Diagnosis: When the thermistor reaches 48°F
(9°C), CB reads 3.9 kΩ from the thermistor and turns harvest termination over to
the harvest timer (S4 dip switch 1 & 2 and S5 dip switch 4). Check discharge line
temperature. For a thermistor check, see "II.G.Thermistor Check." Once harvest timer
terminates, LED 3 & 2 turn off and freeze cycle starts. If 1-min. 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.
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6) Freeze Cycle – LED 1 is on. Comp, FMRs, and PM continue. LLVs energize.
HGVs, X10, X11, and X13 relays de-energize. Appliance is held in freeze by a 5-min.
short cycle protection timer. After 5-min. short cycle protection timer terminates and FS
opens, freeze cycle terminates.
Note: PM power supply switches from CB K1 #5 (DBU) in HPT to K1 #4 (R) in freeze.
Rell – LEDs 1 and 4 are on. The KMS-1402MLJ uses a single F/S with a double F/S,
UF/S rell initiation oat switch setting (S5 dip switch1) and is set for 1 rell (S5 dip
switch 2 through 3). When the freeze cycle starts, CB monitors UF/S. No UF/S exists
on the KMS-1402MLJ, therefore CB reads an open UF/S signal when the freeze cycle
starts and immediately initiates a rell (CB energizes WV1 through X10 relay). Since
there is no UF/S to close and terminate the rell, the rell lasts for the maximum time of
1-minute. During the 1-minute rell, LED 4 is on. Comp, FMRs, LLVs, and PM continue.
Anti-Slush: When anti-slush is enabled (S5 dip switch 5 "ON"), PM de-energizes when
thermistor reaches 36°F (2.2°C) (5.8kΩ) for 10 sec. then, energizes for the remainder of
the freeze cycle.
a) Freeze Cycle Diagnosis: Conrm Comp, FMRs, and PM continue. Conrm that
LLVs energize. Next, conrm HGVs, X10, X11, and X13 relays de-energize. During
the rst 5 min. of freeze, conrm evaporator is cooling. If not, conrm that WV1 and
WV2 are de-energized (not leaking by), HGVs de-energized (not bypassing), LLVs
energize, TXV and HM operate correctly, Comp is efficient, and refrigerant charge is
correct. See "VIII.A. 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. Next, check Comp start relay, start and run capacitors
(single phase), and Comp motor winding continuity. If Comp is energized but
evaporator is not cooling, check for an inefficient Comp. See "VIII.A. 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.
c) WV1, WV2, and HGVs Diagnosis: WV1/WV2: If WV1or WV2 energized or
bypassing, check for 115VAC at CB K1 #6 (O) to neutral (W). If 115VAC is present
after PM energizes and LEDs 2 and 4 are off, replace CB. If 115VAC is not present,
clean or replace WV1 or WV2 (bypassing). HGVs: If HGVs did not de-energize at the
end of harvest and LED 2 is off, check for 115VAC at CB K1 #2 (P) to neutral (W).
If 115VAC is present and LEDs 2 and 3 are off, replace CB. If 115VAC is not present,
replace (defective) HGVs.
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