Hoshizaki KM520MAJE, KM660MAJE User Manual

Service Manual

Modular Crescent Cuber

Models
KM-520MAJ-E
KM-660MAJ-E

hoshizakiamerica.com

Number: 73232
Issued: 10-11-2018

WARNING

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

Hoshizaki provides this manual primarily to assist qualied service technicians in the
service and maintenance of the icemaker. Should the reader have any questions or
concerns which have not been satisfactorily addressed, please call the appropriate
Hoshizaki Service Office:

UK/Ireland - Hoshizaki UK
TEL : [phone]
FAX: [phone]

Holland - Hoshizaki Europe
TEL : [phone]
FAX: [phone]

Belgium/Luxemburg - Hoshizaki Belgium
TEL : [phone]
FAX: [phone]

Germany/Switzerland/Austria - Hoshizaki Deutschland
TEL : [phone]
FAX: [phone]

France - Hoshizaki France
TEL : [phone]
FAX: [phone]

Other countries - Hoshizaki Europe
TEL: [phone]
FAX: [phone]

Web Site: www.hoshizaki-europe.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

B. Water/Refrigeration Circuit Diagram .............................................................................. 8

II. Sequence of Operation and Service Diagnosis ................................................................. 9

A. Sequence of Operation Flow Chart ............................................................................... 9

1. Operation Flow Chart .............................................................................................. 9

2. Shutdown Flow Chart ............................................................................................ 10

B. Service Diagnosis ........................................................................................................11

C. Control Board Check ................................................................................................... 17

D. Bin Control Check and Adjustment .............................................................................. 18

E. Float Switch Check and Cleaning ............................................................................... 21

F. Thermistor Check ......................................................................................................... 23

G. Control Switch ............................................................................................................. 23

H. Mode Switch ............................................................................................................... 23

I. Diagnostic Tables .......................................................................................................... 24

J. Freeze-Up Check List .................................................................................................. 28

III. Controls and Adjustments ............................................................................................... 29

A. Control Board Layout .................................................................................................. 30

B. LED Lights and Audible Alarm Safeties ....................................................................... 31

C. Settings and Adjustments ............................................................................................ 32

1. Default Dip Switch Settings .................................................................................... 32

2. Harvest Time (S4 dip switch 1 & 2)........................................................................ 33

3. Pump-Out Time/Harvest Time During Pump-Out (S4 dip switch 3 & 4) ................. 33

4. Pump-Out Frequency Control (S4 dip switch 5) ..................................................... 34

5. Harvest Pump Time (Harvest Assist Duration) (S4 dip switch 6) ........................... 34

6. Harvest Pump Time (Harvest Assist) (S4 dip switch 7) ........................................ 35

7. Factory Use (S4 dip switch 8)................................................................................. 35

8. Freeze Timer (S4 dip switch 9 & 10) ...................................................................... 36

9. Pump-Out Pump Motor Direction (S5 dip switch 1) ............................................... 36

10. Rell Counter (S5 dip switch 2 and 3) .................................................................. 37

11. Minimum Harvest Time (S5 dip switch 4) ............................................................. 37

12. Slush Control (S5 dip switch 5) ............................................................................ 37

IV. Refrigeration Circuit and Component Service Information.............................................. 38

A. Refrigeration Circuit Service Information .................................................................... 38

B. Component Service Information .................................................................................. 41

V. Maintenance .................................................................................................................... 42

VI. Preparing the Appliance for Periods of Non-Use ............................................................ 43

VII. Disposal ......................................................................................................................... 44

3

VIII. Technical Information .................................................................................................... 45

A. Specication and Performance Data Sheets ............................................................... 45

1. KM-520MAJ-E ........................................................................................................ 45

2. KM-660MAJ-E ....................................................................................................... 46

B. Wiring Diagrams ......................................................................................................... 47

1. KM-520MAJ-E, KM-660MAJ-E .............................................................................. 47

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 severe damage to equipment.

• 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 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.

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 Models (MAJ-E)

Drain Valve

Cleaning Valve

Water Supply Inlet

Spray Tubes

Evaporator

Inlet Water Valve

Thermostatic
Expansion Valve

Float Switch

Compressor

Water Pump

Control Switch

Stainer

Hot Gas Valve

Condenser

High-Pressure
Switch

Fan Motor

Liquid Line
Valve

Drier

Bin
Control

Control Box

Mode Switch

Model Shown: KM-520MAJ

7

B. Water/Refrigeration Circuit Diagram

1. Air-Cooled Models (MAJ-E)

Hot Gas

Val ve

Condenser

High-Pressure

Switch

Drier

Fan

Liquid Line Valve

Heat

Exchanger

Thermistor

Water Supply

Strainer

Suction Line

Discharge Line

Compressor

Thermostatic Expansion Valve

Spray Tubes

Inlet Water Valve

Water Pump

Drain

Refrigeration Circuit

Water Circuit

Evaporator

Bypass Valve

Drain Valve

Float Switch

Water Tank

8

II. Sequence of Operation and Service Diagnosis

A. Sequence of Operation Flow Chart

1. Operation Flow Chart

cycle

(S4 dip switch 5)

de-energizes for 2 sec.,

then energizes for

10/20 sec.

(S4 dip switch 3 & 4)

FS opens or freeze

FS in control

timer terminates

Comp energized

DV energized

HGV energized

PM de-energizes for 2 sec.,

then energizes for 10/20 sec.

Slush Control

Thermistor temperature

reaches 36°F (2.2°C)

(5.8 kΩ).

PM de-energized for 10 sec.

FM de-energized

LLV de-energized

4. Pump-Out Cycle

• Factory set for every 10th

• Pump motor

• Min. freeze time: 5 min.

3. Freeze Cycle

switch 9 & 10).

• Max. freeze time: freeze timer setting (S4 dip

5-min.

minimum

freeze timer in

Harvest Pump

control

Timer

FS closed

50 sec.

Comp energized

FM energized

PM energized

LLV energized

HGV de-energized

FS check

FS open

Operation Flow Chart

PM energized

WV de-energized

FS closed

Thermistor temperature reaches

Comp energized

HGV energized

48°F (9°C) (3.9 kΩ or less).

Harvest timer starts.

WV energized

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

When the control switch is in the "PUMP" position power is supplied to the pump motor. Water tank contents then ows over the outside of the

evaporator plate assembly. Note: Water tank contents does not ow inbetween the evaporator plates.

(S4 dip switch 7), whichever is shorter. Do not adjust S4

dip switch 7 out of the factory position.

• WV time: 6 min. or the length of harvest minus 50 sec.

2. Harvest Cycle

1 to 3-min. harvest timer in

control (S4 dip switch 1 & 2)

Thermistor

in control

• Max. harvest time: 20 min.

WV energized

FS open

If FS is open, Comp stops and cycle returns to

1-Min. ll.

then initiates a clean/sanitze program. See the maintenance label on the top cover or the instruction manual for details.

over outside of evaporator plate assembly as the control board power supply has been disconnected. The Clean/Sanitize program cannot initiate in this scenario.

• When the control switch is in the "ON" position and the mode switch is in the "CLEAN" position power is supplied to the control board K9 connector. The control board

Legend:

BC–bin control

Comp–compressor

DV–drain valve

FM–fan motor

FS–oat switch

HGV–hot gas valve

LLV –liquid line valve

PM–pump motor

Components Energized when the Control Switch is in the "ON" or "PUMP" position and the Mode Switch

WV–inlet water valve

• When the control switch is in the "PUMP" position and the mode switch is in the "CLEAN" position, only the pump motor energizes and circulates water tank contents

is in the "CLEAN" Position

Fill Cycle

FS check

1. 1-Minute

Cycle

Steps

Startup

9

2. Shutdown Flow Chart

3. Ice Level Lowered

2. Icemaker Off

Icemaker starts at

"1. 1-Minute Fill Cycle."

All components

de-energized.

To 1. 1-Minute Fill Cycle

BC closed

(BC sensor disengaged)

Green UBC LED on

Yellow "BC OPEN" LED off

Yellow "BC OPEN" LED continues. All

components de-energized.

Shutdown Flow Chart

Control board retains freeze-time correction count data

between bin control restarts.

to 15 sec. into the freeze cycle if

activated at the end of the harvest cycle.

15 sec. before the 5-min. short cycle

protection timer terminates.

Otherwise, at the end of the next harvest

cycle.

BC open (BC sensor engaged)

Green UBC 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

10

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.C. Control
Board Check." Check dip switch settings to assure that S4 dip switches and S5 dip
switches 1 through 5 are in the factory default position. S4 dip switch 1, 2, 3, 4, and 5 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 (230VAC), check electrical outlet power supply and

conrm 13A power supply cord fuse is good.

• Main transformer; The 115VAC neutral (W) for components is provided through
the main transformer. To conrm a good 115VAC neutral (W), check for 60VAC
from white (W) neutral to ground/earth (GND (EARTH)). If 60VAC is present,
main transformer and neutral is good. If 60VAC is not present, check 230VAC
main power supply to the main transformer. If 230VAC is present at the electrical
outlet, check power supply cord fuse and main transformer continuity.

• When checking component high voltage (115VAC), always choose a white (W)
neutral wire to establish a good neutral connection.

• 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) Remove the front panel, then move the control switch to the "OFF" position. Next,
unplug the power supply cord from the electrical outlet. Access the control box and
check that the 115VAC 10A fuse is good.

2) Clear ice from BC sensing area.

11

1. Sequence and Component Diagnosis

3) Power On: Plug the power supply cord back into the electrical outlet, then move the
control switch to the "ON" position and the mode switch to the "ICE" position.
A 5-sec. delay occurs. CB red "POWER OK" LED turns on. If CB yellow "BC
OPEN" LED is on (indicating a full bin), move ice away from BC sensing area or
see "II.D. Bin Control Check and Adjustment."

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.C. Control Board Check" or
BC using steps in "II.D. Bin Control Check and Adjustment."

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

Check for 115VAC at control switch #2 (BK) to neutral (W) then at control switch #1(P)
to neutral (W). If 115VAC is present on #2 (BK) and not on #1(P), replace control
switch. If 115VAC is present on control switch #1 (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 CT continuity. If open, replace CT.

b) HPS Diagnosis: Check that the condenser coil is not clogged or restricted. Let

refrigeration circuit pressures equalize. If HPS does not reset and pressures are
equalized, replace HPS. If pressures are not equalized, reclaim refrigerant and
diagnose refrigeration circuit restriction. Check that there are no restrictions in the
refrigeration circuit.
Harvest Cycle: HGV, strainer, or check valve.
Freeze Cycle: FM, TXV, LLV, strainer, check valve, and drier.

Conrm that the location meets installation requirements:

• The appliance is not intended for outdoor use. Normal operating ambient temperature
should be within 45°F to 100°F (7°C to 38°C).

• Allow 6" (15 cm) clearance at rear, sides, and top for proper air circulation and ease of
maintenance and/or service should they be required.

• The appliance should not be located in a corrosive environment.

4) 1-Min. Fill Cycle – LED 4 is on. WV energizes. After 1 min., CB checks for a closed
FS. If FS is closed, the harvest cycle begins. If harvest cycle begins (Comp and HGV
energize), 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.E. Float Switch Check and
Cleaning." If FS is closed and CB fails to start the harvest cycle after 1 min., replace CB.

12

5a) Initial Harvest Cycle – LEDs 1, 4, and 2 are on. WV continues. Comp and HGV

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 is 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 #9 (Y) to neutral (W). If 115VAC is not
present, check for 115VAC at CB K1 #10 (BK) to neutral (W). If115VAC is present
at #10 (BK) and not at #9 (Y), replace CB. If 115VAC is present, check for 115VAC
at mode switch #2 (Y) to neutral and mode switch #1 (V) to neutral. If 115VAC is
present at #2 (Y) and not at #1 (V), conrm mode switch is in "ICE" position. If in
"ICE" position, check mode switch continuity. If open, replace mode switch. If 115VAC
is present at mode switch #1 (V), check for 115VAC at CR solenoid. If 115V AC 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, check for 115VAC at CB K1 #1 (V). If 115VAC is not present,
check wiring for loose connection from CB 10 pin connector pin #1 (V) to mode
switch. If 115VAC is present on #1 (V) and not at #2 (P), replace CB.
If 115VAC is present at #2 (P), check for 115VAC at HGV coil and check HGV coil
continuity. Replace as needed. Note: LED is off when HGV is energized and on when
LLV/FM are energized.

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.

5b) Harvest Pump Time (Harvest Assist) – LEDs 1 and 3 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 and LED 3 turns on. PM energizes. Comp and
HGV 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.F. 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 #4(R). If115VAC is not present, replace
CB. If 115VAC is present and PM is not energized, check PM capacitor and motor
winding continuity.

13

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.F.Thermistor Check." If 1-min. ll cycle
starts after harvest timer terminates, check that FS is clean and operating properly, see
"II.E. Float Switch Check and Cleaning." If FS is closed, CB proceeds to the next cycle.
Ifnot, replace CB.
Note: The minimum total time allowed by CB for a complete harvest cycle is based on
S5 dip switch 4. Maximum harvest time allowed is 20 min.

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

6) Freeze Cycle – LED 1, 2, and 3 are on. Comp and PM continue. FM and LLV energize.
HGV de-energizes. 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 continues from CB K1 #4 (R) in harvest and in freeze.
Slush Control: When slush control is enabled (S5 dip switch 5 "ON"), PM de-energizes
when thermistor reaches 36°F (2.2°C) (5.8 kΩ) for 10 sec. then, energizes for the
remainder of the freeze cycle.

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

LLV energize. Next, conrm HGV de-energizes. 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 energize, TXV operates correctly,
Comp is efficient, and refrigerant charge is correct. See "VIII.A. Specication and
Performance Data Sheets."

b) Comp Diagnosis: If Comp de-energizes once freeze begins, check that appliance

has not shut off on HPS (CB "POWER OK" LED off). If so, check "3)b) HPS
Diagnosis" above. If CB "POWER OK" LED is on, check for 115VAC at CB K1 #9
(Y) to neutral (W). If 115VAC is not present and LED 1 is on, replace CB. 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 external overload,
Comp start and run capacitors, Comp start relay, and Comp motor winding. If Comp
is energized but evaporator is not cooling, check for an inefficient Comp.
See "VIII.A. Specication and Performance Data Sheets."

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 de-energize
at the end of harvest, check for 115VAC at CB K1 #2 (P) to neutral (W). If 115VAC
is present and LED 2 is on, 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 PM capacitor and motor winding continuity. Except for 10 sec. slush control.

14

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 and LED 2 is on, check for
115VAC at CB K1 #1(V). If 115VAC is present at #1 (V) and not at #3 (BK), replace
CB. If 115VAC is present and LED 2 is on:
For FM, check capacitor, motor winding, and blade for binding.
For LLV, check coil voltage and continuity.
Note: LED 2 is on for LLV/FM and off for HGV.

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

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

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

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

h) Short Freeze Cycle Diagnosis: Conrm water tank lls and overows during 1 min.

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 DV is not leaking by (water owing down the drain). If DV is leaking by, remove
and clean DV, replace if necessary. If water tank is full, see "II.E. Float Switch Check
and Cleaning." for erratic operating FS.

15