Hoshizaki KMD860MRJ User Manual

Service Manual

Modular Crescent Cuber

Model
KMD-860MAJ, MWJ, MRJ

hoshizakiamerica.com

Number: 73221
Issued: 1-30-2018

WARNING

Only qualied service technicians should install and service the appliance. To
obtain the name and phone number of your local Hoshizaki Certied Service
Representative, visit www.hoshizaki.com. No service should be undertaken until
the technician has thoroughly read this Service Manual. Failure to service and
maintain the appliance in accordance with this manual will adversely affect safety,
performance, component life, and warranty coverage and may result in costly water
damage. Proper installation is the responsibility of the installer. Product failure or
property damage due to improper installation is not covered under warranty.

Should the reader have any questions or concerns which have not been satisfactorily
addressed, please call, send an e-mail message, or write to the Hoshizaki Technical
Support Department for assistance.

Phone: [phone]
Fax: [phone]

E-mail: [e-mail]

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 Diagram ....................................................... 7

A. Construction .................................................................................................................. 7

1. Air-Cooled (MAJ) ...................................................................................................... 7

2. Water-Cooled (MWJ) ............................................................................................... 8

3. Remote Air-Cooled (MRJ) ........................................................................................ 9

B. Water/Refrigeration Circuit Diagram ............................................................................ 10

1. Air-Cooled Models (MAJ) ....................................................................................... 10

2. Water-Cooled Models (MWJ) ..................................................................................11

3. Remote Models (MRJ) ........................................................................................... 12

II. Sequence of Operation and Service Diagnosis ............................................................... 13

A. Sequence of Operation Flow Chart ............................................................................. 13

1. Operation Flow Chart ............................................................................................ 13

2. Shutdown Flow Chart ............................................................................................ 14

3. Freeze-Time Correction Chart ............................................................................... 15

B. Service Diagnosis ....................................................................................................... 16

C. Freeze-Time Correction Cycle (90 min.) ..................................................................... 24

D. Control Board Check ................................................................................................... 26

E. Bin Control Check ....................................................................................................... 27

F. Float Switch Check and Cleaning ................................................................................ 29

1. Float Switch Check ................................................................................................ 29

2. Float Switch Cleaning ............................................................................................ 30

G. Thermistor Check ........................................................................................................ 31

H. Control Switch ............................................................................................................. 31

I. Diagnostic Tables .......................................................................................................... 32

J. Freeze-Up Check List .................................................................................................. 36

III. Controls 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) (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 Selector (S5 dip switch 1) ................................................................. 44

10. Rell Counter (S5 dip switch 2 and 3) ................................................................... 44

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

C. Water Regulating Valve Adjustment (water-cooled model) .......................................... 49

V. Maintenance .................................................................................................................... 50

VI. Preparing the Icemaker for Periods of Non-Use ............................................................. 51

VII. Disposal ......................................................................................................................... 53

VIII. Technical Information .................................................................................................... 54

A. Specication and Performance Data Sheets ............................................................... 54

1. KMD-860MAJ ......................................................................................................... 54

2. KMD-860MWJ ....................................................................................................... 55

3. KMD-860MRJ ........................................................................................................ 56

B. Wiring Diagram ........................................................................................................... 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 re, follow basic
precautions including the following:

• Only qualied service technicians should install and service this appliance.

• The appliance must be installed in accordance with applicable national, state, and
local codes and regulations.

• Electrical connection must be hard-wired and must meet national, state, and local
electrical code requirements. Failure to meet these code requirements could result
in death, electric shock, serious injury, re, or damage.

• The icemaker requires an independent power supply of proper capacity. See the
nameplate for electrical specications. Failure to use an independent power supply
of proper capacity can result in a tripped breaker, blown fuses, damage to existing
wiring, or component failure. This could lead to heat generation or re.

• THE ICEMAKER MUST BE GROUNDED. Failure to properly ground the icemaker
could result in death or serious injury.

• Move the control switch to the "OFF" position and turn off the power supply before
servicing. Lockout/Tagout to prevent the power supply from being turned back on
inadvertently.

• To reduce the risk of electric shock, do not touch the control switch or service switch
with damp hands.

• Do not make any alterations to the unit. Alterations could result in electric shock,
injury, re, or damage to the unit.

• The appliance is not intended for use by persons (including children) with reduced
physical, sensory, or mental capabilities, or lack of experience and knowledge,
unless they have been given supervision or instruction concerning use of the
appliance by a person responsible for their safety.

5

WARNING, continued

• Children should be properly supervised around this appliance.

• Do not climb, stand, or hang on the appliance or allow children or animals to do so.
Serious injury could occur or the appliance could be damaged.

• Do not use combustible spray or place volatile or ammable substances near the
appliance. They might catch re.

• Keep the area around the appliance clean. Dirt, dust, or insects in the appliance
could cause harm to individuals or damage to the appliance.

Additional Warning for Remote Models

• THE REMOTE CONDENSER UNIT MUST BE GROUNDED. The power supply and
ground connection to the remote condenser unit are supplied from the icemaker.
Failure to properly ground the remote condenser unit could result in death or
serious injury.

• Move the icemaker control switch to the "OFF" position and turn off the power
supply to the icemaker before servicing the remote condenser unit.
Lockout/Tagout to prevent the power supply from being turned back on
inadvertently.

NOTICE

• Follow the instructions in this manual carefully to reduce the risk of costly water
damage.

• In areas where water damage is a concern, install in a contained area with a oor
drain.

• Install the appliance in a location that stays above freezing. Normal operating
ambient temperature must be within 45°F to 100°F (7°C to 38°C).

• Do not leave the icemaker on during extended periods of non-use, extended
absences, or in sub-freezing temperatures. To properly prepare the icemaker for
these occasions, follow the instructions in "VI. Preparing the Appliance for Periods
of Non-Use."

• Do not place objects on top of the appliance.

• The dispenser unit/ice storage bin is for ice use only. Do not store anything else in
the dispenser unit/ice storage bin.

6

I. Construction and Water/Refrigeration Circuit Diagram

A. Construction

1. Air-Cooled (MAJ)

Spray Tubes

Inlet Water Valve

Thermostatic
Expansion
Valves

Water Supply Inlet

Hot Gas Valve

Junction Box

Condenser

Control Box

Float Switch

Drain Valve

Cleaning Valve

Condenser
Fan Motor

Main Transformer

Drier

Control Switch

Water Pump

Compressor

Bin Control

7

2. Water-Cooled (MWJ)

Spray Tubes

Thermostatic
Expansion
Valves

Inlet Water Valve

Water Supply Inlet

Hot Gas Valve

Junction Box

Water
Regulator

Condenser

Control Box

Float Switch

Drain Valve

Water Pump

Cleaning Valve

Control Switch

Bin Control

Main Transformer

Drier

Compressor

8

3. Remote Air-Cooled (MRJ)

Spray Tubes

Inlet Water Valve

Water Supply Inlet

Hot Gas Valve

Main Transformer

Junction
Boxes

Control Box

Receiver
Tank

Float Switch

Drain Valve

Water Pump

Cleaning Valve

Thermostatic
Expansion
Valves

Bin Control

Control Switch

Drier

Liquid Line Valve

Compressor

Crankcase Heater

9

B. Water/Refrigeration Circuit Diagram

1. Air-Cooled Models (MAJ)

10

2. Water-Cooled Models (MWJ)

11

3. Remote Models (MRJ)

12

II. Sequence of Operation and Service Diagnosis

A. Sequence of Operation Flow Chart

1. Operation Flow Chart

10th cycle

(S4 dip switch 5)

2 sec., then reverses for

10/20 sec.

• Pump motor stops for

(S4 dip switch 3 & 4)

FS in control

Comp energized

FMR energized

HGV energized

LLV de-energized

PM de-energizes for 2 sec.,

then reverses for 10/20 sec.

FS opens or freeze

timer terminates

Anti-Slush

Thermistor temperature

reaches 36°F (2.2°C)

(5.8 kΩ).

PM de-energized for

10 sec.

• Factory set for every

4. Pump-Out Cycle

CB: 2A7664-02

When freeze time differential exceeded,

freeze-time correction cycle starts.

See "II.A.3. Freeze-Time Correction Chart."

FS closed

50 sec.

Comp energized

FM energized

FMR energized

LLV energized

PM energized

HGV de-energized

FS check

FS open

3. Freeze Cycle

• Min. freeze time: 5 min.

• Max. freeze time: freeze timer setting

(S4 dip switch 9 & 10).

5-min.

minimum

freeze timer in

Harvest Pump

control

Time

Operation Flow Chart

PM energized

1 to 3-min. harvest timer in

control (S4 dip switch 1 & 2)

Thermistor

in control

HPT setting (S4 dip switch 6), whichever is shorter.

• WV time: 6 min. or the length of harvest minus

• Max. harvest time: 20 min.

2. Harvest Cycle

WV de-energized

FS closed

Thermistor temperature reaches

Comp energized

FMR energized

48°F (9°C) (3.9 kΩ or less).

Harvest timer starts.

HGV energized

WV energized

Components Energized when the Control Switch is in the "WASH" Position

The "WASH" position on the control switch is used when cleaning and sanitizing the unit. When in the "WASH" position, power is supplied

to the pump motor. With the cleaning valve closed, the cleaner and sanitizer ow over the outside of the evaporator plate assembly. With the

cleaning valve open, the cleaner and sanitizer ow over both the outside and the inside of the evaporator plate assembly.

Note: Close the cleaning valve after cleaning and sanitizing are complete, otherwise the unit will not restart when the control

switch is placed in the "ICE" position.

WV energized

13

FS open

If FS is open, Comp stops and cycle

returns to 1-Min. ll.

Legend:

BC–bin control

CB–control board

Comp–compressor

FM–fan motor

FMR–fan motor-remote

FS–oat switch

HGV–hot gas valve

HPT–harvest pump time

LLV –liquid line valve

PM–pump motor

WV–inlet water valve

Fill Cycle

1. 1-Minute

Cycle

Steps

FS check

Startup

2. Shutdown Flow Chart

2. Icemaker Off

3. Ice Level Lowered

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

Control board 2A7664-02 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

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

• Freeze Cycle– 15 sec. after activation if activated at least

14

3. Freeze-Time Correction Chart

2. 10-Minute Fill/Overow

WV energized

Comp de-energized

FMR de-energized

HGV 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

FMR energized

HGV energized

PM energized

WV energized

2A7664-02 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

FMR–fan motor-remote

HGV–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 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:

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

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.

15

B. Service Diagnosis

WARNING

• The appliance should be diagnosed and repaired only by qualied service
personnel to reduce the risk of death, electric shock, serious injury, or re.

• Risk of electric shock. Control switch in "OFF" position does not de-energize all
loads. Use extreme caution and exercise safe electrical practices.

• Moving parts (e.g., fan blade) can crush and cut. Keep hands clear.

• Before servicing the appliance, move the control switch to the "OFF" position and
turn off the power supply.

• CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are
securely in place after the appliance is serviced. Make sure that none have fallen
into the dispenser unit/ice storage bin.

• Make sure all food zones in the appliance and dispenser unit/ice storage bin are
clean after service.

The diagnostic procedure is a sequence check that allows you to diagnose the electrical
system and components. Before proceeding, check for correct installation, proper voltage
per nameplate, and adequate water supply. Check CB using the steps in "II.D. Control
Board Check." Check dip switch settings to assure that S4 dip switch 3, 4, 7, 8, 9, 10
and S5 dip switch 1 through 5 are in the factory default position. S4 dip switch 1, 2, 5, 6
are cleaning adjustments and the settings are exible. For factory default settings, see
"III.C.1. Default Dip Switch Settings."

Note: • When checking high voltage (115VAC), always choose a white (W) neutral wire to

establish a good neutral connection.

• The neutral (W) is provided through MT. To conrm a good neutral, check for
60VAC from white (W) neutral to ground (GND). If 60VAC is present, neutral 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. Move the control switch to the
"OFF" position. Clear any ice from BC.

2) Check that BC is closed and the 115VAC 10A fuse is good.

16

1. Operation Diagnosis

3) Power On: Turn on the power supply, then move the control switch to the "ICE" position.
A 5-sec. delay occurs. CB red "POWER OK" LED and green "BC CLOSED" LED turn
on. If yellow "BC OPEN" LED is on (indicating a full bin), check BC. Move ice away from
BC actuator paddle. If yellow "BC OPEN" LED stays on, see "II.E. 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."

• Conrm CB green "BC CLOSED" LED is on. If CB yellow "BC OPEN" LED is on,
remove ice from BC. If no ice is around BC and yellow "BC OPEN" LED is on,
see "II.E. Bin Control Check."

a) Power On Diagnosis: If CB red "POWER OK" LED is off, conrm 10A fuse is good.

Check for 115VAC at control switch #1 (BR) to neutral (W) then at control switch
#2(P) to neutral (W). If 115VAC is present on #1 (BR) and not on #2(P), replace
control switch. If 115VAC is present on control switch #2 (P), check for 115VAC at
HPS (P) to neutral (W) then HPS (BK) to neutral (W). If115VAC is present at HPS
(P) and not at HPS (BK), HPS is open. See HPS Diagnosis below. If115VAC is
present at HPS (BK), check for 10.5VAC at CB K2#1 red wire to CB K2 #2 red wire.
If10.5VAC is not present, check that the cleaning valve interlock switch is closed.
Next, check CT continuity. If open, replace CT.

b) HPS Diagnosis: Conrm condenser coil is not clogged or restricted. Let refrigeration

circuit pressures equalize. If HPS does not reset and pressures are equalized,
replace HPS. Ifpressures are not equalized, reclaim refrigerant and diagnose
refrigeration circuit restriction. Check that there are no restrictions in the refrigeration
circuit.
Harvest Cycle: HGV, strainer, or check valve.
Freeze Cycle: FM, FMR, TXV, HM, LLV, WRV, strainer, check valve, drier, damaged
line set or tting, and fan blade for binding.

Conrm that the location meets installation requirements. See the appliance's

instruction manual for details.

4) 1-Min. Fill Cycle – LED 4 is on. WV and X11 relay energize. After 1 min., CB checks for
a closed FS. If FS is closed, the harvest cycle begins. If harvest cycle begins (Comp,
HGV, FMR 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 coil continuity. Ifopen, replace WV. If the water tank lls, but the appliance fails to
start harvest (Comp energized), check for open FS. See "II.F. Float Switch Check and
Cleaning." If FS is closed and CB fails to start the harvest cycle after 1 min., replace
CB.

17

5a) Initial Harvest Cycle – LEDs 1, 4, and 2 are on. WV and X11 relay continue. Comp,

FMR, HGV, 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, conrm that Comp

energizes. If not, check for 115VAC at CB K1 #1 (V) or #9 (V) to neutral (W).
If115VAC is not present, check for 115VAC at CB K1 #7 (BR) or #10 (BR) to neutral
(W). If115VAC is present at #7 (BR) or #10 (BR) and not at #1 (V) or #9 (V), replace
CB. If 115VAC is present, check for 115VAC at CR solenoid. If 115VAC is present,
conrm contacts are closed. If not, replace CR. If CR contacts are closed, check
Comp external overload, Comp start and run capacitors, Comp start relay, and
Comp motor winding.

b) HGV Diagnosis: If Comp is energized and evaporator is not warming, check that

HGV energizes and opens. Check for 115VAC at CB K1 #2 (P) to neutral (W).
If115VAC is not present and LED 2 is on, replace CB. If 115VAC is present, check
for 115VAC at HGV coil and check HGV coil continuity. Replace as needed.

c) LLV Diagnosis: Conrm that LLV is de-energized and closed (not bypassing).

Ifenergized, replace CB. If de-energized and bypassing, replace LLV.

d) WRV Diagnosis: Conrm WRV is not leaking by. If WRV is leaking by, conrm HGV

is open and LLV is closed. Next, check for proper refrigerant pressures. If refrigerant
pressures are correct, adjust or replace WRV. See "IV.C. Water Regulating Valve
Adjustment (water-cooled model)."

18

5b) Harvest Pump Time (Harvest Assist) – LEDs 1, 3, and 2 are on. When the

thermistor reaches 48°F (9°C), CB reads 3.9 kΩ from the thermistor and turns harvest
termination over to the harvest timer (S4 dip switch 1 & 2 and S5 dip switch4).
WhenWV de-energizes, LED 4 turns off, X11 relay de-energizes and LED 3turns on.
PM energizes. Comp, FMR, HGV, 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? Conrm 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 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 #4(R) and #5(Y). Ifcontacts are open, replace
control switch. If contacts are closed and 115VAC is present between control switch
terminal #5(Y) 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. 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.
Ifnot, replace CB.
Note: The minimum total time allowed by CB for a complete harvest cycle is based on

S5 dip switch 4. Maximum harvest time allowed is 20min.

NOTICE! S4 dip switch 7 must remain on. Otherwise, PM will not energize during
the last seconds of harvest.

19

6) Freeze Cycle – LED 1 is on. Comp, FMR, and PM continue. FM and LLV energize.
HGV 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.

a) Freeze Cycle Diagnosis: Conrm Comp, FMR, and PM continue. Conrm that

FM and LLV energize. Conrm WRV opens. Next, conrm HGV and X10 relay
de-energize. During the rst 5 min. of freeze, conrm evaporator is cooling. If not,
conrm WV de-energized (not leaking by), HGV de-energized (not bypassing),
LLV and FM (if not connected to CB K1 connector pin #9) energize, TXV and HM
operate correctly, WRV opens, Comp is efficient, and refrigerant charge is correct.
See"VIII.A. Specication and Performance Data."

b) Comp, FM, and FMR Diagnosis: If Comp, FM, and FMR de-energize once freeze

begins, check that appliance has not shut off on HPS ("POWER OK" LED off). If so,
check "3)b) HPS Diagnosis" above. If"POWER OK" LED is on, check for 115VAC
at CB K1 #1 (V) or #9 (V) to neutral (W). If 115VAC is not present and LED 1 is on,
replace CB.
Comp: If 115VAC is present, check for 115VAC at CR coil. If 115VAC is present,
check CR coil and contact continuity. Replace as needed. If CR is okay, check Comp
start relay and start and run capacitors. Next, check Comp motor winding continuity.
If Comp is energized but evaporator is not cooling, check for an inefficient Comp.
See"VIII.A. Specication and Performance Data."
FM: If Comp is energized but FM is not, check capacitor, motor winding, and fan
blade for binding.
FMR: If Comp is energized but FMR is not, check for 115VAC at the FMR junction
box. If 115VAC is not present, check icemaker wiring connections. If 115VAC is
present, check for voltage at condenser unit. If115VAC is not present, check eld
wiring connections. If 115VAC is present, check FMR capacitor, motor winding, and
fan blade for binding.

c) WV and HGV Diagnosis: If WV is energized, check for 115VAC at CB K1 #6 (O) to

neutral (W). If 115VAC is present after PM energizes in harvest cycle, replace CB.
If115VAC is not present, replace WV (bypassing). If HGV did not close at the end of
harvest, check for 115VAC at CB K1 #2 (P) to neutral (W). If 115VAC is present and
LED 3 is off, replace CB. If 115VAC is not present, replace HGV (bypassing).

d) PM Diagnosis: Conrm water is owing over evaporator from PM and not WV. If PM

de-energizes once freeze begins, check for 115VAC at CB K1 #4 (R) to neutral (W).
If 115VAC is not present, replace CB. If 115VAC is present and PM is de-energized,
check for 115VAC at control switch #5 (Y) to neutral (W). If 115VAC is present at CB
K1 #4 (R) and not at control switch #5 (Y), check control switch continuity between
#5 (Y) and #4 (R). Replace as needed. If 115VAC is present at control switch #5 (Y)
to neutral (W), check PM capacitor and motor winding continuity.

20

e) FM and LLV Diagnosis: If FM or LLV does not energize, check for 115VAC at CB

K1#3 (BK) to neutral (W). If 115VAC is not present, replace CB. If 115VAC is present:
For FM, check capacitor, motor winding, and blade for binding.
For LLV, check coil voltage and continuity.

f) Refrigerant Pressures, HM, and TXV Diagnosis: If evaporator is still not cooling,

check refrigerant pressures. See "VIII.A. Specication and Performance Data
Sheets."
Next, check HM operation. If refrigeration pressures are above HM setpoint and
HMis bypassing, replace HM. Check TXV for proper operation. Remove TXV bulb
and hold it in your hand, refrigerant low-side pressure should rise, place TXV bulb in
ice water, refrigerant low-side pressure should drop. A 10 to 15 pound pressure swing
between warm and cold conditions indicate a good TXV. If a 10 to 15 pound swing is
not present, replace TXV.

g) WRV Diagnosis: WRV is factory set and generally no adjustment is required.

IfWRV fails to open in freeze, check for proper refrigerant pressures. See "VIII.A.
Specication and Performance Data Sheets." If refrigerant pressures are correct and
WRV does not open, adjust or replace as needed. See "IV.C. Water Regulating Valve
Adjustment (water-cooled model)."

h) Freeze Termination Diagnosis: After 5 min. in freeze, disconnect CB K5 FS

connector. 15 sec. later appliance should switch out of the freeze cycle (15 second
delay after FS opens before terminating the freeze cycle). If appliance remains in
freeze longer than 15 sec. after FS removed, replace CB. If appliance switches with
FS removed but would previously not switch out of freeze with FS connected (long
freeze - 3 beep alarm), see "II.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. Specication and Performance Data Sheets."

i) Short Freeze Cycle Diagnosis: Conrm water tank lls and overows during ll and

harvest cycles. If not, check water supply lters, shut-off valve, WV screen. Ifwater
tank empties before 5 min. timer terminates and freeze cycle is short, check that CV
is not leaking by (water owing down the potable drain). If CV is leaking by, remove
and clean CV, replace rubber seat and spring if necessary. If water tank is full, see
"II.F. Float Switch Check and Cleaning." for erratic FS.

21

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

OFF Every 10 cycles After 11th freeze cycle

ON Every cycle After 2nd freeze cycle

Pump-Out
Frequency

1st Pump-Out

Comp and FMR continue, HGV energizes. If S4dip switch 3 & 4 are set to 3off Comp
continues, HGV energizes, FM and LLV (if applicable) de-energizes. NOTICE!S4dip

switch 3 & 4 must not be set to 3 off and 4 on. Otherwise, LED 4 turns on
energizing WV, X11, and X10 relay. Once X10 relay energizes, X12 relay, PM, and
DV cannot energize. PM stops for 2 sec., then X12 relay, PM, and DV energize for

10/20 sec. depending on pump-out timer (S4 dip switch 3 & 4) setting. When 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 re-starts, DV energizes, and water is owing
down the drain through DV.

b) CB Diagnosis: Conrm FM and LLV (if applicable) de-energize. If FM or LLV

(ifapplicable) is energized with LEDs 1, 3, and 2 on, replace CB. If PM does not
stop and re-start 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, PM, and DV Diagnosis:" below. If X12 relay is energized and PM 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, PM, and DV are 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), conrm 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-enrgized,
check relay coil continuity. Replace as needed.

22

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(Y)
to neutral (W). If 115VAC is not present, conrm 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 (Y), replace X12
relay. If 115VAC is present at X12 relay #4 (Y) 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), conrm 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 satised or power is switched off. The

appliance always restarts at the 1-min. ll cycle.

2. Shutdown Diagnosis

1) See "II.E. Bin Control Check."

3. Freeze-Time Correction Cycle Diagnosis

1) See "II.C. Freeze-Time Correction Cycle (90 min.)."

Legend: BC–bin control; CB–control board; Comp–compressor; CR–compressor relay;

CT–control transformer; CV–check valve; FM–fan motor; FMR–fan motor remote;
FS–oat switch; HGV–hot gas valve; HM–headmaster (C.P.R.); HPS–high-pressure
switch; L LV–liquid line valve; PM–pump motor; TXV–thermostatic expansion valve;
WRV–water regulating valve; WV–inlet water valve

23

C. Freeze-Time Correction Cycle (90 min.)

Freeze-Time Correction function is enabled when S4 Dip Switch 7 is in the "ON" position
and initiates when the minimum and maximum freeze times have exceeded differential
parameters. Freeze-time correction timer and count starts at the beginning of the 2nd
freeze cycle after startup from power off condition. Freeze-time correction timer and count
continues and retains its freeze-time correction timer and count during a BC off cycle
and resumes its freeze-time correction timer and count on the 2nd freeze cycle after BC
restart. If freeze-time differential is exceeded (see table below), freeze-time correction
cycle starts and CB red "POWER OK" LED blinks. When freeze-time correction cycle
occurs 3 or more times within a 36 hour period, CB yellow "EXT HARVEST" LED blinks
with CB red "POWER OK" LED. Appliance starts in freeze cycle after a freeze-time
correction cycle. Toreset CB LEDs, press ALARM RESET button on CB with power on.
CB resets LEDs and appliance continues cycle without interruption.

1) Freeze Time Differential Initiation: CB starts monitoring freeze times on the second
freeze time. After 3freeze cycles (4th total), CBbegins to compare minimum and
maximum freeze time cycles. Every freeze cycle time after the rst freeze cycle
time is added to the freeze time list. Minimum and maximum freeze time differential
comparisons begin on the third cycle and are monitored up to 10cycles. On the 11th
cycle the rst freeze cycle time is dropped to maintain the 10 maximum number of
cycles.
Example: After 8 cycles (excluding rst 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

3 254
4 309
5 349
6 380
7 406
8 427
9 446

10 462

Differential
Value in Sec.

24

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 rst 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 nal step
initiates and nal Harvest Pump Time (Harvest Assist) with WV (10-min.) starts. Once
the nal 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, FMR, HGV, PM, and WV energize.
10-min. timer starts. Once 10-min. timer terminates, CB LEDs 1, 3, and 2 turn off and
Comp, FMR, 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,
FMR, 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, FMR, 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 re-starts at 1. Fill Cycle.
Alarm Reset: CB "ALARM RESET" pressed during or after a freeze-time correction
cycle with power supply on: Appliance continues cycle with no interruption or reset.
CB red "POWER OK" LED blinking: CB red "POWER OK" LED resets to solid.
CB yellow "EXT HARVEST" LED blinking: CB yellow "EXT HARVEST: LED turns off.

Legend: BC–bin control; CB–control board; Comp–compressor; CR–compressor relay;

CT–control transformer; CV–check valve; FM–fan motor; FMR–fan motor remote;
FS–oat switch; HGV–hot gas valve; HM–headmaster (C.P.R.); HPS–high-pressure
switch; L LV–liquid line valve; PM–pump motor; TXV–thermostatic expansion valve;
WRV–water regulating valve; WV–inlet water valve

25

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 ll 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, 5,are cleaning
adjustments and the settings are exible. 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 #1 (BR) and control switch terminal
#3 (P) to neutral (W). If 115VAC is present at control switch terminal #1 (BR) and not
at control switch terminal #3 (P), replace control switch. If 115VAC is present at control
switch terminal #3 (P), check for 115VAC at HPS (BK) to neutral (W). If 115VAC is
not present, see "B.1. or 2. 3)b) HPS Diagnosis." If 115VAC is present 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.

Following the test, the icemaker begins operation at the 1-minute ll cycle. If the LEDs
do not light as described above, replace CB.

4) To verify voltage output from CB to the components, slide the CB K1 connector out far
enough to allow multimeter lead contact. With the icemaker in the cycle to be tested,
check output voltage from the corresponding pin on CB K1 connector to a neutral
(Wwire). If output voltage is not found and the appropriate LED is on, replace CB.

5) Conrm BC communication and shutdown sequence: Move the control switch to the
"ICE" position. Once the ll cycle starts press and hold the BC actuator paddle. CB
shuts down the appliance after 15 sec.. If not, conrm BC status. See "II.E. Bin Control
Check." If BC checks ok, replace CB.

Legend: BC–bin control; CB–control board; CT–control transformer

26

E. Bin Control Check

a) Bin Control Check

A lever-actuated proximity switch is used to control the ice level in the storage bin.
No adjustment is required.

To check BC, follow the steps below.

1) Turn off the power supply.

2) Remove the front panel, then move the control switch to the "OFF" position.

3) Remove the control box cover, then clear any ice away from
BC.

4) Check BC wire harness connections. See Fig. 1.

BC Connector
(to control
board K4 (red)
connector)

5) Disconnect BC connector from CB K4 connector.

6) Check for continuity across the wires of
BC connector. When the actuator paddle is
not engaged, BC switch is closed. If open,
check that the wire harness connector is

BC

BC Wire Harness
(white) Connector

properly connected and that the actuator
paddle is not sticking. Clean if necessary.
See "II.E.b) Bin Control Cleaning." If BC
switch still reads open, replace BC.

Actuator
Paddle

Fig. 1

7) Press and hold the actuator paddle; check for continuity across the wires of BC
connector. When the actuator paddle is engaged, BC switch is open. If closed, check
that the actuator paddle is not restricted. Clean if necessary. See "II.E.b) Bin Control
Cleaning." If BC switch still reads closed, replace BC.

8) Reconnect BC connector to CB K4 connector, then move the control switch to the "ICE"
position. Turn on the power supply.

9) Check that CB green "BC CLOSED" LED is on.

10) Allow the icemaker to cycle on. Press and hold the actuator paddle. CB yellow
"BCOPEN" LED should turn on and the icemaker should shut down according to the
chart below. If it does not, replace CB.

Cycle at Bin
Control Activation

Fill Cycle 15 sec. after activation.

Harvest Cycle At the end of the harvest cycle, or up to 15 sec. into the freeze cycle if activated at the

Freeze Cycle 15 sec. after activation if activated at least 15 sec. before the 5-min. short cycle

Shutdown

end of the harvest cycle.

protection timer terminates. Otherwise, at the end of the next harvest cycle.

Legend: BC–bin control; CB–control board

27

b) Bin Control Cleaning

Scale may build up on BC. Scale can cause the actuator paddle and magnet to stick. In
this case, BC should be cleaned.

WARNING

CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are

securely in place after the icemaker is serviced. Make sure that none have fallen
into the dispense unit/ice storage bin.

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.

4) Disconnect BC connector from CB K4 connector, then remove BC from the icemaker.

5) Remove the actuator paddle from the switch mount. See Fig. 2.

6) Wipe down BC with a mixture of 1 part of Hoshizaki "Scale Away" and 25 parts of warm
water. Rinse the parts thoroughly with clean water.

7) Reassemble BC and replace it in its correct position.
Note: If the magnet was removed for cleaning, be sure to replace it in its correct

position.

8) Reconnect BC connector to CB K4 connector, then move the control switch to the "ICE"
position.

9) Replace the control box cover in its correct position.

10) Turn on the power supply to start the automatic icemaking process.

11) Replace the front panel in its correct position.

Legend: BC–bin control; CB–control board

BC Wire Harness
(white) Connector

BC Bracket

Switch Mount

Actuator
Paddle

BC Connector
(to control
board K4 (red)
connector)

Bin Control Proximity
Switch Closed
(calling for ice)

Bin Control
Proximity Switch
Open (bin full,
icemaker off or
shutting down)

Fig. 2

Magnet

Model Shown: KMD-530M_H

28

F. Float Switch Check and Cleaning

FS is used to determine that there is sufficient water in the water tank after the 1-min.
ll cycle and after each harvest cycle. FS is also used to determine that the appropriate
volume of water has been converted into ice before switching out of the freeze cycle.
No adjustment is required.

1. Float Switch Check

To check FS, follow the steps below.

1) Turn off the power supply.

2) Remove the front panel and move the control switch to the "OFF" position.

3) Remove the front insulation panel, then remove splash guard, cube guide B, and cube
guide A. Next, remove the overow cap, overow pipe, and water shield. See Fig. 3.

4) Remove the drain plug and drain the water
tank. Replace the drain plug in its correct
position. Be careful not to cross thread it.

5) Replace the water shield, overow pipe,
overow cap, cube guide A, cube guide B,
splash guard, and front insulation panel in
their correct positions.

NOTICE! Be careful not to cross thread
the overow pipe.

Overow Cap

Overow Pipe

Splash Guard

6) Remove the control box cover.

7) Disconnect the black oat switch connector
from the K5 connector on the control board.

8) Check for continuity across the oat switch
leads. With the water tank empty, the oat
switch should be open. If open, continue to
step 9. If closed, follow the steps in "II.F.2.

Cube Guide A

Cube Guide B

Fig. 3

Drain
Plug

Water
Shield

Float Switch Cleaning." After cleaning
the oat switch, check it again. Replace
ifnecessary.

9) Reconnect the black oat switch connector, then replace the control box cover.

10) Move the control switch to the "ICE" position. Replace the front panel in its correct
position, then turn the power supply on. After 1 minute, the 1 minute ll cycle should
end and the initial harvest cycle should begin. If the initial harvest cycle begins, the oat
switch is good and the check is complete. If the initial harvest cycle does not begin,
continue to step 11.

11) Turn off the power supply.

12) Remove the front panel.

13) Move the control switch to the "OFF" position.

14) Remove the control box cover.

29

15) Disconnect the black oat switch connector from the K5 connector on the control board.

16) Check for continuity across the oat switch leads. With the water tank full, the oat
switch should be closed. If the oat switch is closed and the icemaker will not switch
from the 1 minute ll cycle to the initial harvest cycle, replace the control board.

If FS is open, conrm that the water tank is full. If the water tank is not full, check the
water supply, water lters, 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 needed.

Legend: CB–control board; FS–oat switch

2. Float Switch Cleaning

Depending on local water conditions, scale may build up on FS. Scale on the switch can
cause the oat to stick. In this case, FS should be cleaned.

1) Turn off the power supply.

2) Remove the front panel and move the control switch to the "OFF" position.

3) Remove the front insulation panel, then remove splash guard, cube guide B, and cube
guide A. Next, remove the overow cap, overow pipe, and water shield. See Fig. 3.

4) Remove the drain plug and drain the water tank. Replace the drain plug in its correct
position. Be careful not to cross thread it.

5) Replace the water shield, overow pipe, overow cap, cube guide A, cube guide B,
splash guard, and front insulation in their correct positions. NOTICE! Be careful not to

cross thread the overow pipe.

6) Disconnect the vent tube and ush tube from the top of the oat switch, then remove the
oat switch and rubber boot.

7) Remove the retainer rod from the bottom of the oat switch assembly, then remove the
oat. Be careful not to bend the retainer rod excessively when removing it. See Fig. 4.

8) Wipe down the oat switch assembly's housing, shaft, oat, and retainer rod and clean
the inside of the rubber boot and hose with a mixture of 1 part of Hoshizaki "Scale
Away" 25 parts of warm water. Rinse the parts thoroughly with clean water.

9) Reassemble the oat switch assembly and replace it and the rubber boot in their correct
positions. Reconnect the vent tube and the ush tube.

10) Move the control switch to the "ICE" position.

Vent

11) Replace the front panel in its correct position.

12) Turn on the power supply to start the
automatic icemaking process.

Legend: CB–control board; FS–oat switch; PM–pump motor

Shaft

Float Switch
Housing

30

Float

Retainer Rod

Fig. 4

G. Thermistor Check

To check thermistor resistance, follow the steps below.

1) Turn off the power supply.

2) Remove the front panel. Move the control switch to the "OFF" position.

3) Remove the control box cover.

4) Remove the thermistor from the refrigerant tubing.

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 K3 connector and check the 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 the next step.

7) Replace the thermistor in its correct position. See "IV.B. Component Service
Information."

8) Reconnect the thermistor connector to CB 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

H. Control Switch

The control switch has three positions: "OFF" for power off, "ICE" for icemaking, and
"WASH" to energize the pump motor when cleaning and sanitizing. WARNING! Control

switch in "OFF" position does not de-energize all loads. Risk of electric shock.
Use extreme caution and exercise safe electrical practices.

31

I. Diagnostic Tables

1. No Ice Production

No Ice Production - Possible Cause

1. Power Supply a) Off, blown fuse, or tripped breaker.

b) Not within specications.

2. Main Transformer a) Voltage tap switch not set to proper voltage.

b) Coil winding open or shorted, defective.

3. Fuse (control box) a) Blown.

4. Control Switch a) In "OFF" or "WASH" position.

b) Bad contacts.

5. High-Pressure Switch a) Dirty condenser.

b) Fan motor not operating.

c) Refrigerant overcharged.

d) Bad contacts.

e) Refrigerant lines or components plugged.

6. Control Transformer
(115VAC/10.5VAC)

7. Control Board
See "II.D. Control Board Check"

8. Bin Control
See "II.E. Bin Control Check "

9. Water Supply a) Water supply off or improper water pressure.

10. Inlet Water Valve a) Screen or orice clogged.

11. Float Switch
See "II.F. Float Switch Check and
Cleaning"

12. Compressor a) Compressor relay contacts bad or coil winding open.

13. Hot Gas Valve a) Closed in harvest cycle.

14. Thermistor
See "II.G. Thermistor Check"

15. Pump Motor a) Motor winding open.

a) Coil winding open or shorted.

a) In alarm.

b) Yellow "BC OPEN" LED on: Bin full.

c) Defective.

a) Tripped with bin lled with ice.

b) Actuator does not move freely.

c) Defective.

b) External water lters clogged.

b) Coil winding open.

c) Water valve open in freeze cycle.

a) Float does not move freely.

b) Defective.

b) Start capacitor or run capacitor defective.

c) Internal protector open.

d) Start relay contacts bad or coil winding open (single phase).

e) Compressor defective.

b) Open in freeze cycle.

a) Loose, disconnected, or defective.

b) Bearing worn out or locked rotor.

c) Defective capacitor.

32

No Ice Production - Possible Cause

16. Thermostatic Expansion Valve a) Bulb loose.

b) Operating erratically.

1 7. Liquid Line Valve a) Closed in freeze cycle.

b) Open in harvest cycle.

18. Fan Motor a) Motor winding open.

b) Bearing worn out or locked rotor.

c) Defective capacitor.

19. Water System a) Water leaks causing short freeze time.

2. Freeze-Up

Defrost and clean the icemaker prior to diagnosing freeze-up. Fill out a freeze-up checklist.
See "II.J. Freeze Up Check List," the Hoshizaki America Technician's Pocket Guide, or
contact your local distributor for a copy of the freeze-up checklist.

Freeze-Up - Possible Cause

Harvest Cycle

1. Evaporator a) Scaled up.

b) Damaged.

2. Cube Guides a) Out of position.

b) Damaged.

3. Spray Tubes and/or Spray
Guides

4. Water Supply a) Low water pressure.

5. Inlet Water Valve a) Screen or orice clogged.

6. Float Switch
See "II.F. Float Switch Check and
Cleaning"

7. Refrigerant Charge a) Low.

8. Control Board
See "III.C. Settings and
Adjustments" and "II.D. Control
Board Check"

9. Bin Control
See "II.E. Bin Control Check"

10. Thermistor
See "II.G. Thermistor Check"

11. Thermostatic Expansion Valve a) Defective.

12. Hot Gas Valve a) Closed or restricted.

13. Liquid Line Valve a) Open.

a) Dirty.

b) Out of position.

b) External water lters clogged.

c) Insufficient water line size.

Minimum 1/4" Nominal ID (6 mm Nominal OD in the EU) copper
water tubing or equivalent.

b) Defective.

a) Dirty, sticking.

b) Defective.

a) Harvest timer (S4 dip switch 1 & 2) set too short.

b) Harvest pump timer (S4 dip switch 7) not in factory default position.

c) Defective.

a) Actuator does not move freely, sticking.

b) Defective.

a) Loose, disconnected, or defective.

33

Freeze-Up - Possible Cause

Freeze Cycle

1. Evaporator a) Scaled up.

b) Damaged.

2. Spray Tubes and/or Spray
Guides and Splash Guard

3. Refrigerant Charge a) Low.

4. Control Board
See "II.D. Control Board Check"

5. Inlet Water Valve a) Leaking by.

6. Float Switch
See "II.F. Float Switch Check and
Cleaning"

7. Pump Motor a) RPM too slow.

8. Thermostatic Expansion Valve a) Bulb loose or defective.

9. Liquid Line Valve a) Restricted.

10. Headmaster (C.P.R.)
(remote models)

a) Dirty.

b) Out of position.

a) Freeze timer (S4 dip switch 9 & 10) set incorrectly.

b) Defective.

a) Float does not move freely.

b) Defective.

b) Impeller damaged.

a) Not bypassing.

3. Low Ice Production

Low Ice Production - Possible Cause

Long Harvest Cycle

1. Evaporator a) Scaled up.

2. Spray Tubes and/or Spray
Guides

3. Refrigerant Charge a) Low.

4. Water Supply a) Low water pressure.

5. Control Board
See "II.D. Control Board Check"

6. Thermistor
See "II.G. Thermistor Check"

7. Hot Gas Valve a) Erratic or closed.

8. Inlet Water Valve a) Screen or orice clogged.

9. Compressor a) Inefficient or off.

10. Liquid Line Valve a) Erratic or open.

11. Thermostatic Expansion Valve a) Defective.

a) Dirty.

b) Out of position.

b) External water lters clogged.

c) Insufficient water line size.

Minimum 1/4" Nominal ID (6 mm Nominal OD in the EU) water
tubing or equivalent.

d) Too cold.

a) Thermistor connection loose (K3).

b) Defective.

a) Loose, disconnected, or defective.

34

Low Ice Production - Possible Cause

Long Freeze Cycle

1. Evaporator a) Scaled up, dirty.

2. Float Switch
See "II.F. Float Switch Check and
Cleaning"

3. Inlet Water Valve a) Leaking by.

4. Hot Gas Valve a) Erratic or open.

5. Condenser a) Clogged.

6. Control Board
See "II.D. Control Board Check"

7. Refrigerant Charge a) Low.

8. Thermostatic Expansion Valve a) Bulb loose.

9. Compressor a) Inefficient or off.

10. Pump Motor a) RPM too slow.

11. Liquid Line Valve a) Erratic or restricted.

12. Headmaster (C.P.R.)
(remote models)

a) Scaled up, dirty.

b) Float sticking.

c) Defective switch.

a) Float switch connection loose (K5).

b) Defective.

b) Defective.

a) Not bypassing.

35

J. Freeze-Up Check List

[ ] 29) Is ice still dropping when next freeze cycle starts?

(Freeze pressure should be taken 5 minutes into

(Freeze pressure should be taken 5 minutes into

shutdown within 15seconds in the rst 5minutes

Freeze-Up Check List

Please Complete When Diagnosing a Freeze-Up, Refrigerant Leak, or Low Charge

Technical Support Fax #: [phone]

Make Copies And Use As Needed

Model #___________________________ Serial # ____________________Install Date____________Freeze-Up Date___________

List model and manufacture of bin or dispenser__________________________.

Date appliance was last cleaned:__________.

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

[ ] [ ] 4) Is the appliance stand alone?
[ ] [ ] 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 ltration?

If yes please list the following:
Filter brand___________________.
Model________________.
Filter pressure gauge reading during the ll
cycle___________.
Date lter was last
replaced?__________________________.
GPM or LPM ow rate of lter
system?__________________.

9) Ambient temperature at appliance?
______________.

At remote condenser (if applicable)?________.

Appliance Status

[ ] [ ] 10) Is the appliance and/or oat 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?

Appliance Operation

Fill
YES NO
[ ] [ ] 17) Does the water tank ll and overow?

[ ] [ ] 18) If NO in step 17, is water ow 5GPM for larger?
[ ] [ ] 19) Does the appliance utilize re-ll (S5 dip switch

Harvest
[ ] [ ] 20) Is the hot gas valve opening?
[ ] [ ] 21) Is harvest pump time (harvest assist) utilized

[ ] [ ] 22) Is hot gas valve opening in harvest?
[ ] [ ] 23) Does water valve close completely when

Freeze
[ ] [ ] 25) Is pump motor energized in freeze cycle except

[ ] [ ] 28) Is the cube size consistent from inlet to outlet of

[ ]

[ ] [ ] 33) When activating bin control, did appliance

Freeze-Time Correction Operation

[ ] [ ] 34) Has Freeze-Time Correction been activated?

[ ] [ ] 35) Has moer than 1 Freeze-Time Correction been

60-90 sec. Note: Larger models may take up to
120 seconds to overow when empty.

2and 3)?

(S4dip switch 7)?

de energized?

24) What was length of harvest?___________.

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?____________.

evaporator?

30) What is the ice drop weight?___________.

31) What is head pressure?
Freeze_________Harvest_______.

the cycle).

32) What is suction pressure?
Freeze______Harvest_______.

the cycle).

of freeze cycle?

("POWER OK" LED blinking).

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.

36

III. Controls and Adjustments

• A Hoshizaki exclusive control board is employed in KMD series appliances.

• All models are pretested and factory adjusted.

• For a control board check procedure, see "II.D. Control Board Check."

NOTICE

• Fragile, handle very carefully.

• The control board contains integrated circuits, which are susceptible to failure
due to static discharge. It is especially important to touch the metal part of the
icemaker when handling or replacing the control board.

• Do not touch the electronic devices on the control board or the back of the control
board.

• Do not change wiring and connections. Do not misconnect K3 WHITE, K4RED,
and K5 BLACK, because the same connector is used for the thermistor,
mechanical bin control, K4 jumper, and oat switch.

• Do not short out power supply to test for voltage.

• Always replace the whole control board assembly if it goes bad.

37

A. Control Board Layout

• Bin Control Switch
Closed LED (green)

• "ALARM RESET" Button

"J" Control Board

• S4 Dip Switch

• "OUTPUT TEST" Button

(used to test relays on control board)

• Bin Control Switch
Open LED (yellow)

• Alarm Buzzer

• Ext. Harvest LED
(yellow) (lights

when water line
thermistor initiates
extended harvest)
Not used this model

• POWER OK LED
(red) (lights when

10.5VAC is supplied
to K2 connector)

• 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

• K3 (white) Connector

Thermistor
(harvest control and
high temperature safety)

• K4 (red) Connector

Bin Control

• S5 Dip Switch

• K5 (black) Connector

Float Switch
(water level)

• Part Number

• K1 Connector

Pins #1 through #10
#1, 9 Compressor Relay
#2 Hot Gas Valve
#3 Fan Motor
Liquid Line Valve
#4 Pump Motor (icemaking)
#5 Pump Motor
(harvest pump timer and
pump-out)
#6 Inlet Water Valve, X11 Relay
#7, 10 Component Power
Supply
#8 Open

• K2 Connector

Control Transformer
(10.5VAC)

"J" Control Board

Part Number 2A7664-02

38

B. LED Lights and Audible Alarm Safeties

Beep occurs and red "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 LED

1-Minute Fill Cycle 4 WV
Harvest Cycle 1, 4, 2 Comp, FM*, FMR, HGV, WV 1 minute 20 minutes
Harvest Pump Time

(harvest assist)
Freeze Cycle 1 Comp, FM/FMR, PM, LLV 5 minutes freeze timer

Anti-Slush Control 1, 3 Comp, FM/FMR, LLV If S5 dip switch 5 on,

Pump-Out Cycle 1, 4
*FM energized if on K1 Connector Pin #9;

1, 3, 2 Comp, FM*, FMR, HGV, PM 0 seconds 50 seconds

†

, 3, 2 Comp, FM*, FMR, HGV, PM, WV †, DV 10 seconds 20 seconds

†

pump-out timer setting

Energized

Components

Time LEDs are On

Min. Max.

setting

PM off 10 sec. when
thermistor at 36°F (2.2°C)

Alarms

Type Alarm Notes

1

Beep

2

Beep

3

Beep

LED Blink Freeze-Time

To reset above safeties, press "ALARM RESET" button with power supply on.

6 Low Voltage

7 High Voltage

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)

Correction (CB-2A7664-02)
(maximum freeze time
differential exceeded)

(92Vac±5% or less)

(147Vac±5% or more)

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.

Check FS stuck closed (up), WV leaking by, HGV leaking
by, PM not pumping, TXV defective, LLV not opening, low
charge, HMnot bypassing, or inefficient Comp.

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."

Red LED turns off if voltage protection operates.
Control voltage safeties automatically reset when voltage
is corrected.

Legend: CB–control board; Comp–compressor; FM–fan motor; FMR–fan motor remote;

FS–oat 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

39

C. Settings and Adjustments

NOTICE

Dip switches are factory set. Failure to maintain factory settings may adversely
affect performance and warranty coverage. For more information, contact your
Hoshizaki Service Center.

1. Default Dip Switch Settings

The dip switches are factory-adjusted to the following positions for both the 2A7664-01
and 2A7664-02 control boards:

S4 Dip Switch

Model 1 2 3 4 5 6 7 8 9 10

KMD-860MAJ OFF OFF OFF OFF OFF OFF ON OFF OFF OFF

KMD-860MWJ OFF OFF OFF OFF OFF OFF ON OFF OFF OFF

KMD-860MRJ OFF OFF OFF OFF OFF OFF ON OFF OFF OFF

S5 Dip Switch (Do Not Adjust)

Model

All Models OFF OFF OFF OFF ON

1 2 3 4 5

ON

Freeze Timer (9 & 10)

Factory Use (8)
Harvest Pump Time (Harvest Assist) and Freeze-Time Correction (7)
(Do Not Adjust)

Harvest Pump Time Timer (Harvest Assist) (6)

Pump-Out Frequency Control (5)

Pump-Out Time (3 & 4)

1 2 3 4 5 6 7 8 9 10

Harvest Timer (1 & 2)

S4 Dip Switch
"J" Control Board

S5 Dip Switch (Do Not Adjust)
"J" Control Board

Anti-Slush (5)

Minimum Harvest Time (4)

Rell Counter (2 and 3)

1 2 3 4 5

ON

Float Switch Selector (1)

40

2. Harvest Time (S4 dip switch 1 & 2)

The harvest timer starts counting when the thermistor reaches 48°F (9°C) at the
evaporator outlet and the control board reads 3.9 kΩ from the thermistor. The harvest
timer is factory set, and generally no adjustment is required. However, a setting longer
than the factory setting may be advised in cases where the drain provided at harvest
needs to be prolonged for extra cleaning. Note that the pump-out timer (S4 dip switch
3 & 4) acts in place of the harvest timer during cycles with a pump out. For details, see
"III.C.3. Pump-Out Timer (S4 dip switch 3& 4)."

Note: On models with a pump-out every cycle, the harvest timer is only relevant during

the initial harvest cycle since a pump out occurs every cycle thereafter.

Time

S4 Dip Switch Setting

No. 1 No. 2 S5-4 OFF S5-4 ON

OFF OFF 60 30

ON OFF 90 45

OFF ON 120 60

ON ON 180 75

(sec.)

3. Pump-Out Time/Harvest Time During Pump-Out (S4 dip switch 3 & 4)

NOTICE

Do not adjust 3 off and 4 on. Pump motor does not run in pump-out rotation in this
setting.

When a pump-out is called for, the pump motor stops for 2 sec., then energizes in the
reverse direction, taking water from the bottom of the water tank and forcing pressure
against the check valve seat allowing water to go through the check valve and down
the drain. At the same time, water ows through the small tube to power ush the oat
switch. The pump motor 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 time can be set to pump-out for 10or 20
sec. During pump-out cycles minimum harvest time is based on times given in the table
below.

S4 Dip Switch Setting Time (sec.)

T1 T2

No. 3 No. 4

OFF OFF 10 150 100 Closed Closed

ON OFF 10 180 130 Closed Closed

OFF ON 10 120 70 Open Closed

ON ON 20 180 180 Closed Closed

S5-4 OFF S5-4 ON S5-4 OFF S5-4 ON

Inlet Water

Valve

T1: Time to drain the water tank
T2: Harvest timer at pump out

41

4. Pump-Out Frequency Control (S4 dip switch 5)

The pump-out frequency control is factory set to drain the water tank every 10 cycles.
Generally no adjustment is required. However, where water quality is bad and the
icemaker needs a pump-out more often, the pump-out frequency can be adjusted. The
pump-out frequency control can be set to have a pump-out occur every cycle, or every
10 cycles.

The rst pump-out is dependent on S4 dip switch 5. See the table below.

S4 Dip Switch Setting

No. 5

OFF Every 10 cycles After 11th freeze cycle

ON Every cycle After 2nd freeze cycle

Pump-Out Frequency 1st Pump-Out

5. Harvest Pump Time (Harvest Assist) (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) is only active when S4 dip switch 7 is in the "ON"
position. In the factory default position, the harvest pump time (harvest assist) 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) is factory set, and no adjustment is required.

Harvest Pump Time

S4 Dip Switch Setting

No. 6 S5-4 OFF S5-4 ON

OFF 50 sec. 25 sec.

ON 25 sec. 15 sec.

(Harvest Assist)

42

6. Harvest Pump Time (Harvest Assist)/Freeze-Time Correction (S4 dip switch 7)

NOTICE

Factory set for proper operation. Do not adjust. Adjustment outside of the factory
default setting may result in damage to the appliance.

a) 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 Diagram." 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 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

When S4 dip switch 7 is in the on position, freeze-time correction enabled.
See "II.C. Freeze-Time Correction Cycle (90 min.)."

S4 Dip Switch Setting

No. 7

OFF Disabled

ON Enabled

Harvest Pump Time

(Harvest Assist)

Freeze-Time Correction

(CB: 2A7664-02)

7. Factory Use (S4 dip switch 8)

Factory set for proper operation. Do not adjust. This must be left in the factory default
position.

43

8. Freeze Timer (S4 dip switch 9 & 10)

NOTICE

Adjust to proper specication, 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 Time

No. 9 No. 10

OFF OFF 60

OFF ON 50

ON OFF 70

ON ON 75

9. Float Switch Selector (S5 dip switch 1)

This dip switch setting allows use of this control board in single and dual oat switch
models. This model uses a single oat switch style.

(min.)

NOTICE

Do not adjust. This must be left in the factory default position or the icemaker will
not operate correctly.

S5 Dip Switch Setting

OFF Bottom Float Switch Enabled

ON Top Float Switch Enabled

Top or Bottom Float Switch

ControlNo. 1

10. Rell Counter (S5 dip switch 2 and 3)

NOTICE

Do not adjust. These must be left in the factory default position or the icemaker will
not operate correctly.

S5 Dip Switch Setting Rell

No. 2 No. 3

OFF OFF 0

OFF ON 1 rell

ON OFF 9 rells

ON ON 10 rells

Counter

44

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 Minimum

No. 4

OFF 120 sec.

ON 70 sec.

Harvest Timer

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 result in damage to the appliance.

S5 Dip Switch Setting

OFF Disabled

ON Enabled

Anti-SlushNo. 5

45

IV. Refrigeration Circuit and Component Service Information

WARNING

• This appliance should be diagnosed and repaired only by qualied service
personnel to reduce the risk of death, electric shock, serious injury, or re.

• Move the control switch to the "OFF" position and turn off the power supply. Place
the disconnect in the "OFF" position. Lockout/Tagout to prevent the power supply
from being turned back on inadvertently.

• CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are
securely in place after the icemaker is serviced. Make sure that none have fallen
into the dispenser unit/ice storage bin.

• Make sure all food zones in the icemaker and dispenser unit/ice storage bin are
clean after service.

A. Refrigeration Circuit Service Information

WARNING

• Repairs requiring the refrigeration circuit to be opened must be performed by
properly trained and EPA-certied 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
ow.

• 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 icemaker is provided with refrigerant access valves. Using proper refrigerant practices,
recover the refrigerant. Store the refrigerant in an approved container. Do not discharge the
refrigerant into the atmosphere.

46

2. Brazing

WARNING

• R-404A itself is not ammable 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 ames), R-404A can be decomposed to form hydrouoric
acid and carbonyl uoride both of which are hazardous.

• Do not use silver alloy or copper alloy containing arsenic.

1) Braze all ttings while purging with nitrogen gas owing 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
ow.

• 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)

1) Attach a vacuum pump to the system. Be sure to connect the charging hoses to both
high and low-side refrigerant access valves.

IMPORTANT

The vacuum level and vacuum pump may be the same as those for current
refrigerants. However, the rubber hose and gauge manifold to be used for
evacuation and refrigerant charge should be exclusively for POE oils.

2) Turn on the vacuum pump. Open the gauge manifold valves. Never allow the oil in the
vacuum pump to ow backwards.

3) Allow the vacuum pump to pull down to a 29.9" Hg vacuum. Evacuating period depends
on pump capacity.

47

4) Close the low-side valve and high-side valve on the gauge manifold.

5) Disconnect the gauge manifold hose from the vacuum pump and attach it to a
refrigerant service cylinder. Remember to loosen the connection and purge the air from
the hose. For the required refrigerant charge, see the rating label inside the icemaker.
Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which meets
AHRI Standard 700 (latest edition) be used.

6) A liquid charge is required when charging an R-404A system (to prevent fractionation).
Place the service cylinder on the scales; if the service cylinder is not equipped with
a dip tube, invert the service cylinder, then place it on the scales. Open the high-side
valve on the gauge manifold.

7) Allow the system to charge with liquid until the proper charge weight is met.

8) If necessary, add any remaining charge to the system through the low-side.

NOTICE!To prevent compressor damage, use a throttling valve or liquid
dispensing device to add the remaining liquid charge through the low-side
refrigerant access valve with the icemaker running.

9) Close the high and low-side gauge manifold valves, then disconnect the gauge manifold
hoses.

10) Cap the refrigerant access valves to prevent a possible leak.

48

B. Component Service Information

NOTICE

When replacing a component listed below, see the notes to help ensure proper
operation.

Component Notes

Compressor 1 phase: Install a new start capacitor, run capacitor, and start relay.

3 phase: Install a new magnetic contactor.

Thermostatic
Expansion Valves

Hot Gas Valves
Liquid Line
Valves

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

• 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.

• Replace the strainer if applicable.

• Use copper tube of the same diameter and length when replacing valve lines.

thermistor.

• The thermistor should be at the 12 o'clock position on the tube.

• Smoothly ll 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.

C. Water Regulating Valve Adjustment (water-cooled model)

The water regulating valve is factory set, and generally no adjustment is required. However,
when necessary, adjust the water regulator using the following procedure.

1) Prepare a thermometer to check the condenser drain temperature. Attach a pressure
gauge to the high-side line of the system.

2) 5 min. after a freeze cycle starts, conrm
that the thermometer reads 104°F to 115°F
(40°C to 46°C). If it does not, rotate the
adjustment screw by using a at blade
screwdriver until the temperature is in the
proper range. See Fig. 5. Next, check that
the reference pressure is in the range
indicated in the Head Pressure table in the
Performance Data section. If it is not in the
proper range, verify the refrigerant charge.

Top View

Adjustment Screw

CW – Higher
CCW – Lower

Fig. 5

3) Check that the condenser drain temperature is stable.

49

V. Maintenance

The maintenance schedule below is a guideline. More frequent maintenance may be
required depending on water quality, the appliance's environment, and local sanitation
regulations

WARNING

• Only qualied service technicians should service the appliance.

• To reduce the risk of electric shock, do not touch the control switch or service
switch with damp hands

• Before servicing: Move the control switch to the "OFF" position and turn off the
power supply. Place the disconnect in the "OFF" position.
Lockout/Tagout to prevent the power supply from being turned back on
inadvertently.

• CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are
securely in place after any maintenance is done to the icemaker. Make sure that
none have fallen into the dispenser unit/ice storage bin.

Maintenance Schedule

Frequency Area Task

Daily Scoop Clean the ice scoop using a neutral cleaner. Rinse thoroughly after

cleaning.
Bi-Weekly Air Filters Inspect. Wash with warm water and neutral cleaner if dirty.
Monthly External Water

Filters
Icemaker Exterior Wipe down with a clean, soft cloth. Use a damp cloth containing a

Underside of
Icemaker and Top
Kits; Bin Door and
Snout

Yearly Icemaker and

Dispenser Unit/Ice
Storage Bin Liner

Water Supply Inlet Close the icemaker water supply line shut-off valve and drain the water

Condenser Inspect. Clean if necessary by using a brush or vacuum cleaner. More

Water Hoses Inspect the water hoses and clean/replace if necessary.

Check for proper pressure and change if necessary.

neutral cleaner to wipe off oil or dirt build up. Clean any chlorine staining

(rust colored spots) using a non-abrasive cleanser.

Wipe down with a clean cloth and warm water.

Clean and sanitize per the cleaning and sanitizing instructions provided

in the instruction manual or maintenance label on the icemaker.

system. Clean the water supply inlet screen.

frequent cleaning may be required depending on location.

50

VI. Preparing the Icemaker for Periods of Non-Use

NOTICE

• When storing the icemaker for an extended time or in sub-freezing temperatures,
follow the instructions below to prevent damage.

• To prevent damage to the water pump seal, do not leave the control switch in the
"WASH" position for extended periods when the water tank is empty.

When the icemaker 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 icemaker for
an extended time or in sub-freezing temperatures, follow the instructions below.

1. Remove the water from the icemaker water supply line:

1) Turn off the power supply, then remove the front panel.

2) Move the control switch to the "OFF" position.

3) Close the icemaker water supply line shut-off valve, then open the icemaker water
supply line drain valve.

4) Allow the line to drain by gravity.

5) Attach a compressed air or carbon dioxide supply to the icemaker water supply line
drain valve.

6) Move the control switch to the "ICE" position.

7) Replace the front panel in its correct position, then turn on the power supply.

8) Blow the icemaker water supply line out using the compressed air or carbon dioxide
supply.

9) Close the icemaker water supply line drain valve.

2. Drain the water tank:

1) Turn off the power supply, then remove the front panel.

2) Move the control switch to the "OFF" position.

3) Remove the front insulation panel. Remove splash guard, cube guide B, then remove
cube guide A. Remove the overow cap, overow pipe, and water shield. See Fig. 3.

4) Remove the drain plug.

5) 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.

6) Replace the drain plug, water shield, overow pipe, overow cap, cube guide A, cube
guide B, splash guard, and front insulation panel in their correct positions. Be careful
not to cross thread the drain plug or overow pipe.

7) Replace the front panel in its correct position.

51

3. On water-cooled models, remove the water from the water-cooled condenser:

1) Make sure the power supply is off, then remove the front panel and right side panel.

2) Close the condenser water supply line shut-off valve. If connected to a closed loop
system, also close the condenser return line shut-off valve.

3) Open the condenser water supply line drain valve. If connected to a closed loop system,
also open the condenser return line drain valve.

4) Attach a compressed air or carbon dioxide supply to the condenser water supply line
drain valve.

5) Open the water regulating valve by using a screwdriver to pry up on the spring retainer
underneath the spring. While holding the valve open, blow out the condenser using the
compressed air or carbon dioxide supply until water stops coming out.

6) Close the drain valve(s).

7) Replace the right side panel and front panel in their correct positions.

52

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 certied service personnel.

53

VIII. Technical Information

We reserve the right to make changes in specications and design without prior notice.

A. Specication and Performance Data Sheets

Pressure data is recorded at 5 min. into freezing cycle. The data not in bold should be
used for reference only.

1. KMD-860MAJ

Specification Sheet

AC SUPPLY VOLTAGE 208-230/60/1
AMPERAGE 10 A
MINIMUM CIRCUIT AMPACITY 20 A
MAXIMUM FUSE SIZE 20 A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kW H/100 lbs.) 1430 (5.16) 1330 (3.74)
WATER gal./24HR (gal./100 lbs.) 200 (30.0) 291 (34.0)
ICE PRODUCTION PER CYCLE 12.7 lbs. (5.8 kg) 720pcs.
BIN CONTROL SYSTEM Mechanical Lever Switch
REFRIGERANT CHARGE TOTAL R404A, 2 lb. 6.8 oz. (1100g)

ICEMAKER, 2 lb. 6.8 oz. (1100g)

Performance Data Sheet

APPROXIMATE ICE PRODUCTION
PER 24 HR.

lbs./day kg./day
APPROXIMATE ELECTRIC
CONSUMPTION

watts 100/38
APPROXIMATE WATER
CONSUMPTION PER 24 HR.

gal./day m3/day
FREEZING CYCLE TIME

min. 100/38
HARVEST CYCLE TIME

min. 100/38
HEAD PRESSURE

PSIG kg/cm2G
SUCTION PRESSURE

PSIG kg/cm2G

AMBIENT TEMP.

(ºF/ºC)

70/21 855 388
80/27 813 369 726 329 679 308
90/32 799 363 665 302 612 278

100/38 794 360 653 296 564 256

70/21
80/27
90/32

70/21 291 1.10
80/27 271 1.02 229 0.87 211 0.80
90/32 264 1.00 200 0.76 178 0.67

100/38 229 0.87 194 0.74 158 0.60

70/21
80/27
90/32

70/21
80/27
90/32

70/21 227 16.0
80/27 226 15.9 224 15.8 307 21.6
90/32 226 15.9 223 15.7 294 20.7

100/38 255 17.9 240 16.9 360 25.3

70/21 46 3.2 51 3.6 56 3.9
80/27 50 3.5 58 4.0 61 4.3
90/32 51 3.6 63 4.4 67 4.7

100/38 51 3.6 64 4.5 71 5.0

50/10 70/21 90/32

1330 1359 1381
1352 1398 1409
1359 1430 1446
1357 1434 1460

20 22 24
21 24
22 25 28
22 26 30

2.2 2.2 2.1

2.2 2.1 2.1

2.2 2.0 2.0

2.1 2.0 2.0

WATER TEMP. (ºF/ºC)

799 363 742 337

264 1.00 239 0.91

226 15.9 279 19.6

26

TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR 1,500 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

13,100 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

54

2. KMD-860MWJ

Specification Sheet

AC SUPPLY VOLTAGE 208-230/60/1
AMPERAGE 10 A
MINIMUM CIRCUIT AMPACITY 20 A
MAXIMUM FUSE SIZE 20 A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kW H/100 lbs.) 1400 (3.90) 1410 (3.60)
WATER gal./24HR (gal./100 lbs.) 176 (20.5) 254 (27.0)
ICE PRODUCTION PER CYCLE 12.8 lbs. (5.8 kg) 720pcs.
BIN CONTROL SYSTEM Mechanical Lever Switch
REFRIGERANT CHARGE TOTAL R404A, 1 lb. 12.2 oz. (800g)

ICEMAKER, 1 lb. 12.2 oz. (800g)

Performance Data Sheet

APPROXIMATE ICE PRODUCTION
PER 24 HR.

lbs./day kg./day
APPROXIMATE ELECTRIC
CONSUMPTION

watts 100/38
APPROXIMATE WATER
CONSUMPTION PER 24 HR.

gal./day m3/day
FREEZING CYCLE TIME

min. 100/38
HARVEST CYCLE TIME

min. 100/38
HEAD PRESSURE

PSIG kg/cm2G
SUCTION PRESSURE

PSIG kg/cm2G

AMBIENT TEMP.

(ºF/ºC)

70/21 940 426
80/27 923 418 887 402 831 377
90/32 917 416 862 391 809 367

100/38 902 409 850 385 760 345

70/21
80/27
90/32

70/21 884 3.34
80/27 993 3.76 1217 4.61 1176 4.45
90/32 1027 3.89 1374 5.20 1371 5.19

100/38 1179 4.46 1374 5.20 1368 5.18

70/21
80/27
90/32

70/21
80/27
90/32

70/21 237 16.7
80/27 238 16.7 240 16.9 255 17.9
90/32 238 16.8 242 17.0 255 17.9

100/38 243 17.1 245 17.2 266 18.7

70/21 39 2.7 40 2.8 44 3.1
80/27 40 2.8 42 3.0 47 3.3
90/32 40 2.8 44 3.1 48 3.4

100/38 42 2.9 45 3.2 52 3.7

50/10 70/21 90/32

1410 1407 1367
1408 1403 1344
1407 1400 1348
1387 1388 1300

17 18 19
18 19
18 19 20
18 20 21

2.6 2.4 2.4

2.5 2.2 2.3

2.4 2.1 2.1

2.3 2.1 2.1

WATER TEMP. (ºF/ºC)

917 416 870 395

1027 3.89 1072 4.06

20

238 16.8 248 17.5

TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR 1,600 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

11,000 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

55

3. KMD-860MRJ

Specification Sheet

AC SUPPLY VOLTAGE 208-230/60/1
AMPERAGE 10 A
MINIMUM CIRCUIT AMPACITY 20 A
MAXIMUM FUSE SIZE 20 A
ELECTRIC & WATER CONSUMPTION 90/70°F 70/50°F
ELECTRIC W (kW H/100 lbs.) 1810 (5.10) 1690 (4.19)
WATER gal./24HR (gal./100 lbs.) 155 (18.2) 329 (34.1)
ICE PRODUCTION PER CYCLE 12.8 lbs. (5.8 kg) 720pcs.
BIN CONTROL SYSTEM Mechanical Lever Switch
REFRIGERANT CHARGE TOTAL R404A, 9 lb. 14.6 oz. (4497g)

ICEMAKER, 5 lb. 15.9 oz. (2718g)
CONDENSER, 3 lb. 14.8 oz. (1779g)

Performance Data Sheet

APPROXIMATE ICE PRODUCTION
PER 24 HR.

lbs./day kg./day
APPROXIMATE ELECTRIC
CONSUMPTION

watts 100/38
APPROXIMATE WATER
CONSUMPTION PER 24 HR.

gal./day m3/day
FREEZING CYCLE TIME

min. 100/38
HARVEST CYCLE TIME

min. 100/38
HEAD PRESSURE

PSIG kg/cm2G
SUCTION PRESSURE

PSIG kg/cm2G

AMBIENT TEMP.

(ºF/ºC)

70/21 967 439
80/27 941 427 888 403 835 379
90/32 933 423 850 386 797 362

100/38 922 418 838 380 749 340

70/21
80/27
90/32

70/21 329 1.25
80/27 290 1.10 211 0.80 220 0.83
90/32 278 1.05 155 0.59 151 0.57

100/38 223 0.84 154 0.58 148 0.56

70/21
80/27
90/32

70/21
80/27
90/32

70/21 205 14.4
80/27 218 15.3 244 17.1 265 18.7
90/32 222 15.6 262 18.4 284 20.0

100/38 226 15.9 267 18.8 305 21.4

70/21 36 2.5 39 2.7 43 3.1
80/27 38 2.7 42 3.0 47 3.3
90/32 39 2.7 45 3.2 50 3.5

100/38 40 2.8 46 3.2 55 3.9

50/10 70/21 90/32

1690 1725 1896
1717 1771 2010
1725 1810 2024
1801 1860 2220

17 18 19
17 19
18 20 22
18 20 23

3.1 2.7 2.7

2.8 2.3 2.4

2.7 2.0 2.0

2.4 2.0 2.0

WATER TEMP. (ºF/ºC)

933 423 882 400

278 1.05 259 0.98

21

222 15.6 244 17.1

TOTAL HEAT OF REJECTION FROM CONDENSER
TOTAL HEAT OF REJECTION FROM COMPRESSOR 2,000 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

13,000 BTU/h [AT 90ºF (32ºC) / WT 70ºF (21ºC)]

56

B. Wiring Diagram

*

Water-Cooled Model

* High-Pressure Switch

Air-Cooled and

Remote Air-Cooled Models

PSIG

21.3

PSIG 384±

0 0

21.3

Cut-out 412±

Cut-in 327±21.3 PSIG 284±21.3 PSIG

57