Hoshizaki 73183 User Manual

Hoshizaki

Hoshizaki America, Inc.

Commercial Series
Refrigerated Kitchen Equipment

Models
Reach-In B-Series

“A Superior Degree

of Reliability”

www.hoshizaki.com

SERVICE MANUAL

Number: 73183
Issued: 3-23-2011
Revised: 12-12-2012

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. 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 appliance.

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

Phone: [phone]
Fax: [phone]

E-mail: [e-mail]

HOSHIZAKI AMERICA, INC.
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. General Information ............................................................................................................ 8

A. Construction .................................................................................................................. 8

B. Refrigeration Flow Chart ............................................................................................... 9

II. Sequence of Operation and Service Diagnosis ............................................................... 10

A. Sequence of Operation Flow Charts ........................................................................... 10

1. Refrigerator ............................................................................................................ 10

2. Freezer ...................................................................................................................11

B. Service Diagnosis ....................................................................................................... 12

1a. Refrigerator-Control Module with Remote Display Module .................................. 14

1b. Refrigerator-Control Module with Integrated Display ............................................ 16

2a. Freezer-Control Module with Remote Display Module ......................................... 18

2b. Freezer-Control Module with Integrated Display .................................................. 22

C. Control Module Check ................................................................................................. 26

1. Control Module with Remote Display Module......................................................... 26

2. Control Module with Integrated Display ................................................................. 27

D. Thermistor Check ........................................................................................................ 28

E. Diagnostic Tables ........................................................................................................ 29

1. Not Cooling ............................................................................................................ 29

2. Evaporator Frozen Up ............................................................................................ 30

3a. Defrost: Control Module with Remote Display Module ........................................ 30

3b. Defrost: Control Module with Integrated Display .................................................. 31

III. Controls and Adjustments ............................................................................................... 32

A. Control and Display Modules ...................................................................................... 32

1. Control Module with Remote Display Module......................................................... 32

a) Remote Display Module Layout ......................................................................... 32

b) Control Module with Remote Display Module Connections ................................ 33

2. Control Module with Integrated Display ................................................................. 34

a) Display Icons ...................................................................................................... 34

b) Display Layout .................................................................................................... 34

c) Control Module with Integrated Display Connections ......................................... 35

B. Temperature ................................................................................................................ 36

1. Default Settings ...................................................................................................... 36

2. Temperature Setpoint ............................................................................................ 36

3. Changing the Temperature Display Scale (°F or °C) ............................................. 36

a) Control Module with Remote Display Module ..................................................... 36

b) Control Module with Integrated Display .............................................................. 37

C. Defrost ........................................................................................................................ 37

1. Control Module with Remote Display Module......................................................... 37

2. Control Module with Integrated Display ................................................................. 37

3

D. Alarm Safeties ............................................................................................................. 38

1. Control Module with Remote Display Module......................................................... 38

2. Control Module with Integrated Display ................................................................ 39

E. Safety Devices ............................................................................................................ 40

F. Mullion/Perimeter Heater ............................................................................................. 40

IV. Replacement of Components ......................................................................................... 41

A. Service for Refrigerant Lines ....................................................................................... 41

1. Refrigerant Recovery ............................................................................................. 41

2. Brazing .................................................................................................................. 42

3. Evacuation and Recharge ..................................................................................... 42

B. Important Notes for Component Replacement ............................................................ 44

C. Door Reversal ............................................................................................................. 44

V. Maintenance .................................................................................................................... 45

1. Condenser .............................................................................................................. 45

2. Power Supply Connection ...................................................................................... 45

VI. Preparing the Appliance for Periods of Non-Use ............................................................ 46

VII. Disposal ......................................................................................................................... 47

VIII. Technical Information .................................................................................................... 48

A. Electrical and Refrigerant Data ................................................................................... 48

B. Wiring Diagrams .......................................................................................................... 49

4

Important Safety Information

Throughout this manual, notices appear to bring your attention to situations which could
result in death, serious injury, or 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.

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 the appliance.

• The appliance must be installed in accordance with applicable national, state, and

local codes and regulations.

• The appliance 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 fuse, or damage
to existing wiring. This could lead to heat generation or re.

• To reduce the risk of electric shock, do not touch the plug or power switch with

damp hands.

• Make sure the power switch is in the "OFF" position before plugging in or

unplugging the appliance to reduce the risk of electric shock.

• Before servicing, move the power switch to the "OFF" position. Unplug the

appliance from the electrical outlet.

For 115VAC Models

• THE APPLIANCE MUST BE GROUNDED: The appliance is equipped with a

NEMA5-15 three-prong grounding plug

hazards. It must be plugged into a properly grounded, independent 3-prong wall
outlet. If the outlet is a 2-prong outlet, it is your personal responsibility to have a
qualied electrician replace it with a properly grounded, independent 3-prong wall
outlet. Do not remove the ground prong from the plug and do not use an adapter
plug. Failure to follow these instructions may result in death, electric shock, or re.

to reduce the risk of potential shock

5

For 208-230VAC Models

WARNING, continued

• THE APPLIANCE MUST BE GROUNDED:

NEMA L14-20 four-prong locking, grounding plug
shock hazards. It must be plugged into a properly grounded, independent 4-prong
wall outlet. If the outlet is a 3-prong outlet or a 4-prong non-locking outlet, it is your
personal responsibility to have a qualied electrician replace it with a properly
grounded, independent 4-prong locking wall outlet. Do not remove the ground
prong from the plug and do not use an adapter plug. After plugging in, twist the plug
clockwise to lock it into place. Failure to follow these instructions may result in death,
electric shock, or re.

For All Models

• The GREEN ground wire in the factory-installed power cord is connected to the

appliance. If it becomes necessary to remove or replace the power cord, be sure to
connect the power cord's ground wire.

• Do not use an extension cord.

• Do not use an appliance with a damaged power cord. The power cord should not

be altered, jerked, bundled, weighed down, pinched, or tangled. Such actions could
result in electric shock or re. To unplug the appliance, be sure to pull the plug, not
the cord, and do not jerk the cord. Before unplugging a 4-prong plug, rotate the plug
counter-clockwise to unlock it.

The appliance is equipped with a

to reduce the risk of potential

• Do not splash, pour, or spray water directly onto or into the appliance. This might

cause short circuit, electric shock, corrosion, or failure.

• Do not make any alterations to the appliance. Alterations could result in electric

shock, injury, re, or damage to the appliance.

• The appliance is not intended for use by persons (including children) with reduced

physical, sensory, or mental capabilities, or lack of experience and knowledge,
unless they have been given supervision or instruction concerning use of the
appliance by a person responsible for their safety.

• Children should be properly supervised around the appliance.

• Do not climb, stand, or hang on the appliance or door or allow children or animals to

do so. Do not climb into the appliance or allow children or animals to do so. Death or
serious injury could occur or the appliance could be damaged.

• Be careful not to pinch ngers when opening and closing the door. Be careful when

opening and closing the door when children are in the area.

• Open and close the doors with care. Doors opened too quickly or forcefully may

cause injury or damage to the appliance or surrounding equipment.

• 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.

• Do not throw anything onto the shelves or load any single shelf with more than
120lb. (54.5 kg) of product. They might fall off and cause injury.

6

WARNING, continued

• Do not place anything on top of the appliance. Foreign objects or moisture could

enter the appliance and result in electric shock or re.

• The appliance is designed only for temporary storage of food. Employ sanitary

methods. Use for any other purposes (for example, storage of chemicals or medical
supplies such as vaccine and serum) could cause deterioration of stored items.

• Do not block air inlets or outlets, otherwise cooling performance may be reduced.

• Do not tightly pack the cabinet. Allow some space between items to ensure good air
ow. Also allow space between items and interior surfaces.

• Do not put warm or hot foods in the cabinet. Let them cool rst, or they will raise the

cabinet temperature and could deteriorate other foods in the cabinet or overload the
appliance.

• All foods should be wrapped in plastic lm or stored in sealed containers. Otherwise

foods may dry up, pass their smells onto other foods, cause frost to develop, result
in poor appliance performance, or increase the likelihood of cross-contamination.
Certain dressings and food ingredients, if not stored in sealed containers, may
accelerate corrosion of the evaporator, resulting in failure.

• Do not store items near the air outlet. They might freeze up and crack or break

causing a risk of injury or contamination of other food.

NOTICE

• Protect the oor when moving the appliance to prevent damage to the oor.

• Keep ventilation openings, in the appliance enclosure or in the built-in structure,

clear of obstruction. Do not place anything on top of the appliance. Blockage of

airow could negatively affect performance and damage the appliance.

• To prevent deformation or cracks, do not spray insecticide onto the plastic parts or

let them come into contact with oil.

• To avoid damage to the gasket, use only the door handle when opening and closing.

7

I. General Information

A. Construction

Condensate Pump

Control Box

Control Module
with Remote
Display Module

Power Cord

Reservoir and
Condensate Pump
Float Switch

Power Switch

Compressor

Display Module/
Control Module
with Integrated
Display

Light Switch
(glass door
models only)

Light

Door Switch

Thermostatic Expansion Valve

Condenser Fan Motor

Condenser

Front Panel

Door Lock

Door

• Evaporator

• Cabinet Thermistor

• Defrost Thermistor

• Evaporator Fan Shroud

Model Shown: CR1B-FS

8

Door Gasket

B. Refrigeration Flow Chart

Condenser

Condenser Fan

High-Pressure Switch

Thermostatic
Expansion Valve

Condensate Pan

Drier

High-Side
Access Valve

Condensate Pump

Defrost Heater and
Defrost Thermostat
(freezer only)

Low-Side
Access
Valve

Evaporator Fans
(2 or 3 depending on model)

Condensate Pump Float Switch

Compressor

Defrost
Thermistor

Reservoir

Evaporator

Cabinet Thermistor

9

II. Sequence of Operation and Service Diagnosis

A. Sequence of Operation Flow Charts

1. Refrigerator

DTh warms to

5. Defrost Termination

4. Defrost

40°F (4.4°C)

DTh cools to

8.6°F(-13°C)

Comp energized

ConFM energized

EvapFM energized

MH energized

DTh in control

EvapFM energized

MH energized

Comp de-energized

ConFM de-energized

CTh warms

to 3°F (1.7°C)

above

setpoint

a) EvapFM de-energizes when door is opened on -FS models and

when upper door is opened on -HS models.

b) 2-min. minimum Comp on timer starts when Comp energizes.

c) 2-min. minimum Comp off timer starts when Comp de-energizes.

d) 20-min. minimum defrost time.

e) 1-hr. maximum defrost time.

f) 2-min. temperature display delay timer starts when defrost termination

temperature is met.

f) Temperature displayed during defrost.

Control Module with Integrated Display

2. Cool Down Achieved

CTh cools

to 3°F (1.7°C)

below setpoint.

Factory default

36°F (2°C)

2-min. Comp off

timer starts

EvapFM energized

MH energized

Comp de-energized

ConFM de-energized

Note:

Control Module with Remote Display Module

Refrigerator Sequence Flow Chart

1. Startup/Cool Down

Cycle Steps

3. Cool Down Restart

Slight

Delay at

Startup

CTh in control

2-min. Comp on

timer starts

Power On

Comp energized

EvapFM energized

ConFM energized

MH energized

EvapFM energized

MH energized

Legend:

Comp-compressor

ConFM-condenser fan motor

CTh-cabinet thermistor

DTh-defrost thermistor

EvapFM-evaporator fan motor

MH-mullion heater

10

2. Freezer

DTh warms to 59°F (15°C)

5. Defrost Termination

MH energized

PH energized

DH de-energized

DrH de-energized

Comp energized (after delay)

ConFM energized (after delay)

EvapFM energized (after delay)

DTh in control

DTh is at or below 32°F (0°C)

and 4-hr. cumulative Comp

4. Defrost

run timer terminates

CTh warms

to 3°F (1.7°C)

above setpoint

DH energized

DrH energized

MH energized

PH energized

Comp de-energized

ConFM de-energized

EvapFM de-energized

Freezer Sequence Flow Chart

CTh cools to

3°F (1.7°C)

below setpoint.

Factory default

-4°F (-20°C)
2-min. Comp off

CTh in control

2-min. Comp on

timer starts

timer starts

EvapFM energized

MH energized

PH energized

Comp de-energized

ConFM de-energized

a) EvapFM de-energizes when door is opened on -FS models and when upper door is opened on -HS models.

b) 2-min. minimum Comp on timer starts when Comp energizes.

c) 2-min. minimum Comp off timer starts when Comp de-energizes.

d) 5-min. minimum defrost time.

e) 1-hr. maximum defrost time.

f) 3-min. Comp/ConFM delay timer starts when defrost termination temperature is met.

g) 8-minute EvapFM delay timer starts when defrost termination temperature is met (3-minute delay timer when defrost initiated manually).

h) 13-minute temperature display delay timer starts when defrost termination temperature is met.

g) 7-minute EvapFM delay timer starts when defrost termination temperature is met (3-minute delay timer when defrost initiated manually)

h) 18-minute temperature display delay timer starts when defrost termination temperature is met (15-minute delay timer when defrost

initiated manually).

Control Module with Integrated Display

Comp energized

ConFM energized

EvapFM energized

MH energized

PH energized

Note:

Control Module with Remote Display Module

2. Cool Down Achieved

1. Startup/Cool Down

3. Cool Down Restart

DTh reaches 32°F (0°C),

then 4-hr. cumulative

Comp run timer starts

Slight

Delay at

Startup

Power on

MH energized

PH energized

11

Legend:

Comp-compressor

ConFM-condenser fan motor

CTh-cabinet thermistor

DH-defrost heater

DrH-drain heater

DTh-defrost thermistor

EvapFM-evaporator fan motor

MH-mullion heater

PH-perimeter heater

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. Use extreme caution and exercise safe electrical practices.

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

• Make sure all food zones are clean after the appliance is serviced.

NOTICE

• The appliance is not intended for outdoor use. Normal operating ambient

temperature must be within 45°F to 100°F (7°C to 38°C).

• The appliance must not be located next to ovens, grills, or other high heat

producing equipment.

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

• The appliance must be a minimum of 4" (11 cm) from side walls.

• A minimum of 10" (25 cm) overhead clearance must be provided for proper

ventilation.

The diagnostic procedure is a sequence check that allows you to diagnose the electrical
system and components. Before proceeding, check for correct installation and proper
voltage per nameplate. Always choose a neutral (W) to establish a good neutral

connection when checking high voltages. If the display is in alarm, see "III.D. Alarm
Safeties."

IMPORTANT

The maximum allowable voltage variation is ±10 percent of the nameplate rating.
115VAC is used as a reference voltage when checking voltage to components.
Voltage may vary depending on power supply.

12

1. Factory Default Settings:
a) Temperature Settings: Refrigerator: 36°F (2°C); Freezer: -4°F (-20°C).
b) Temperature Display Scale: °F.

For further details, see "II.C. Control Module Check" or "III. Controls and Adjustments."

Note • When exposed to high temperatures, a high-temperature alarm "Hi" may occur

at startup. To silence the alarm, press and release the upper button. Alarm
automatically resets when temperature drops to an acceptable range.

• There is a minimum 2-min. Comp on time and 2-min. Comp off time.

1) Move the power switch to the "OFF" position.

2) Unplug the appliance from the electrical outlet.

3) Remove the control box cover.

4) Plug the appliance back into the electrical outlet.

5) Move the power switch to the "ON" position.

6) Conrm 115VAC at the power switch. On 3-section models, also conrm proper supply
voltage at the receptacle box (115VAC for refrigerator/208-230VAC for freezer).

Continue to the appropriate section:

"II.B.1a. Refrigerator-Control Module with Remote Display Module"

"II.B.1b. Refrigerator-Control Module with Integrated Display"

"II.B.2a. Freezer-Control Module with Remote Display Module"

"II.B.2b. Freezer-Control Module with Integrated Display"

13

1a. Refrigerator-Control Module with Remote Display Module

7) Startup/Cool Down–EvapFM and MH energize. There is a slight delay, then Comp and
ConFM energize. Cabinet temperature appears on DM.

a) EvapFMDiagnosis: Conrm EvapFM energizes. If not, conrm doors are closed and

DS engaged. Next, check for 115VAC at DSR #8(LBU) to#7neutral(W). If 115VAC

is not present, check DS continuity. If DS is engaged and contacts are open, replace

DS. If 115VAC is present, check for 115VAC at DSR#4(DBU) to neutral (W). If
115VAC is not present, check for 115VAC at DSR#6 (BK) to neutral(W). If 115VAC
is present at DSR #6 (BK) to neutral (W) and not at DSR #4 (DBU) to neutral(W),
replace DSR. If 115VAC is present at DSR#4(DBU) to neutral (W), check EvapFM

blades for binding and EvapFM continuity.

b) MH Diagnosis: Conrm MH energizes. Check for 115VAC at MH. If 115VAC is not

present, conrm power supply and continuity of power switch. If 115VAC is present,
check amp draw of MH. If an amp reading is not present, check the continuity of
MH. If open, replace MH.

c) CM and DM Diagnosis: Cabinet temperature appears on DM. If not, check for

115VACat CM L3 (BK) to CM N5 neutral (W). If 115VAC is not present, check power

switch, power cord connections, and breaker/fuse. Conrm wiring connections are

secure for both CM L3 (BK) (power supply) and CMN5(W) (neutral). If 115VAC is

present and DM is off, conrm display cable connection is secure. If DM is still off,
replace CM and DM with HS kit.

d) Comp and ConFM Diagnosis: Conrm Comp and ConFM energize. If not, check for

115VAC at CM C1 (R) to neutral (W). If 115VAC is not present at

CM C1(R) to neutral (W), check CTh status. See "II.D.Thermistor Check." IfCTh

ohm reading is in proper range, replace CM and DM with HS kit. If 115VAC is

present at CMC1(R) to neutral (W), check continuity of HPS. If open, allow time
for HPS to reset. If HPS does not reset, see "e) HPS Activation" below. If HPS is

closed, check for 115VAC at CR #5 (GY) to CR #6 neutral (W). If115VAC is present,
check for 115VAC at CR #1 (R) to neutral (W). If 115VAC is not present, replace
CR. If 115VAC is present and ConFM is energized but Comp is not, check for
115VAC at Comp protector #14 to neutral (W). If 115VAC is not present, give time for
Comp protector to cool and reset. If Comp protector does not reset, replace Comp
protector. If 115VAC is present, check Comp start capacitor, start relay, and Comp
motor windings. If ConFM is not energized, check ConFM fan blades for binding and
motor winding continuity.

If Comp and ConFM are energized and the cabinet does not cool down, check for a
restriction in the refrigeration circuit, correct TXV operation, and correct refrigerant
charge.

e) HPS Activation: Conrm ConFM is energized and fan blade turns freely. Conrm

condenser coil is not clogged or restricted. Conrm there are no restrictions in the
refrigeration circuit (TXV and drier). 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.

14

8) Cool Down Achieved–CTh cools to 3°F (1.7°C) below setpoint. EvapFM and MH
continue. Comp and ConFM de-energize. Diagnosis: Conrm Comp and ConFM
de-energize. If not, and Comp and ConFM were energized longer than 2 min., check

CTh status. See "II.D. Thermistor Check." If CTh ohm reading is in range and Comp
and ConFM continue longer than 2 min., check for 115VAC at CM C1 (R) to neutral(W).
If115VAC is present, replace CM and DM with HS kit. If 115VAC is not present and

Comp and ConFM continue, check for 115VAC at CR #1 (R). If 115VAC is present,
replace CR.

9) Defrost–"dEF" is displayed during defrost. There is a 20-min. minimum defrost time,

a1-hr.maximum defrost time, and a 2 hr. minimum defrost interval.

1a) Temperature-Initiated: DTh cools to 8.6°F (-13°C). EvapFM and MH continue.

Comp and ConFM de-energize.

1b) Manually-Initiated: To initiate a manual defrost, press and hold the lower button

for 5seconds. "dEF" appears in the display. If energized, Comp and ConFM

de-energize.

2) Defrost Termination: DTh warms to 40°F (4.4°C). EvapFM and MH continue. Comp
and ConFM energize. 2-min. temperature display delay timer starts. 2 min. later,
cabinet temperature appears on DM.

Defrost Diagnosis:

a) Defrost Initiation: Has DTh cooled to 8.6°F (-13°C) or lower? Conrm DTh status.

See "II.D. Thermistor Check." If DTh is in proper range or manual defrost initiated,
conrm Comp and ConFM de-energize. If not, check for 115VAC at CM C1 (R) to
neutral (W). If 115VAC is present and DTh is within proper range, replace CM and

DM with HS kit. If there is no voltage at CMC1 (R) to neutral (W) and Comp and

ConFM do not de-energize, check for 115VAC at CR #1 (R) to neutral (W). If 115VAC

is present at CR l #1 (R) to neutral(W) and DTh is within proper range, replace CR.

b) Defrost Termination: Has DTh warmed to 40°F (4.4°C)? If not yet conrmed,

conrm DTh status. See "II.D. Thermistor Check." If DTh is in proper range, have
Comp and ConFM energized? If not, see "7d) Comp and ConFM Diagnosis"

above. 2-min. temperature delay timer terminates, temperature appears on display.

Iftemperature does not appear on display after 2-min., replace CM and DM with
HSkit.

Legend: CM–control module; Comp–compressor; ConFM–condenser fan motor;

CTh–cabinet thermistor; DM–display module; DS–door switch; DSR–door switch
relay; DTh–defrost thermistor; EvapFM–evaporator fan motor;
HPS–high-pressure switch; MH–mullion heater

15

1b. Refrigerator-Control Module with Integrated Display

7) Startup/Cool Down–There is a slight delay, cabinet temperature appears on display.
Comp, ConFM, EvapFM, and MH energize.

a) EvapFMDiagnosis: Conrm EvapFM energizes. If not, conrm doors are closed and

DS engaged. Next, check for 115VAC at DSR #8 (LBU) to #7neutral(W). If115VAC

is not present, check DS continuity. If DS is engaged and contacts are open, replace

DS. If 115VAC is present, check for 115VAC at DSR #4(DBU) to neutral (W). If
115VAC is not present, check for 115VAC at DSR #6(BK) to neutral(W). If 115VAC
is present at DSR #6 (BK) to neutral (W) and not at DSR#4(DBU) to neutral (W),

replace DSR. If 115VAC is present at DSR #4 (DBU) to neutral (W), check EvapFM
blades for binding and EvapFM continuity.

b) MH Diagnosis: Conrm MH energizes. Check for 115VAC at MH. If 115VAC is not

present, conrm power supply and continuity of power switch. If 115VAC is present,
check amp draw of MH. If an amp reading is not present, check the continuity of
MH. If open, replace MH.

c) CM Diagnosis: Cabinet temperature appears on display. If not, check for 115VACat

CM L2 (BK) to CM N3 neutral (W). If 115VAC is not present, check power switch,
power cord connections, and breaker/fuse. Conrm wiring connections are secure

for both CM L2 (BK) (power supply) and CMN3(W) (neutral). If 115VAC is present

and display is off, replace CM.

d) Comp and ConFM Diagnosis: Conrm Comp and ConFM energize. Ifnot, check

for 115VAC at CM C1 (R) to neutral(W). If 115VAC is not present at CMC1(R) to
neutral (W), check CTh status. See "II.D.Thermistor Check." If CTh ohm reading

is in proper range, replace CM. If 115VAC is present at CM C1 (R) to neutral (W),
check continuity of HPS. If open, allow time for HPS to reset. If HPS does not reset,

see "e) HPS Activation" below. If HPS is closed, check for 115VAC at CR #5 (GY) to
CR#6neutral (W). If 115VAC is present, check for 115VAC at CR#1(R) to neutral

(W). If 115VAC is not present, replace CR. If 115VAC is present and ConFM is

energized but Comp is not, check for 115VAC at Comp protector#14to neutral (W).

If 115VAC is not present, give time for Comp protector to cool and reset. If Comp

protector does not reset, replace Comp protector. If115VAC is present, check Comp

start capacitor, start relay, and Comp motor windings. If ConFM is not energized,
check ConFM fan blades for binding and motor winding continuity.

If Comp and ConFM are energized and the cabinet does not cool down, check for a
restriction in the refrigeration circuit, correct TXV operation, and correct refrigerant
charge.

e) HPS Activation: Conrm ConFM is energized and fan blade turns freely.

Conrmcondenser coil is not clogged or restricted. Conrm there are no restrictions

in the refrigeration circuit (TXV and drier). 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.

16

8) Cool Down Achieved–CTh cools to 3°F (1.7°C) below setpoint. EvapFM and MH
continue. Comp and ConFM de-energize. Diagnosis: Conrm Comp and ConFM
de-energize. If not, and Comp and ConFM were energized longer than 2 min., check

CTh status. See "II.D. Thermistor Check." If CTh ohm reading is in range and Comp
and ConFM continue longer than 2 min., check for 115VAC at CM C1 (R) to neutral(W).

If 115VAC is present, replace CM. If 115VAC is not present and Comp and ConFM
continue, check for 115VAC at CR #1 (R). If 115VAC is present, replace CR.

9) Defrost–Cabinet temperature is displayed during defrost. There is a 20-min. minimum
defrost time, a 1-hr. maximum defrost time, and a 2-hr. minimum defrost interval.

1a) Time-Initiated: When 2-hr. cumulative Comp run timer terminates, defrost starts (off

cycle). EvapFM and MH continue. Comp and ConFM de-energize.

1b) Manually-Initiated: To initiate a manual defrost, press the manual defrost button

on display. Defrost icon turns on and, if energized, Comp and ConFM de-energize.
Cabinet temperature is displayed during defrost.

2) Defrost Termination: DTh warms to 40°F (4.4°C). EvapFM and MH continue. Comp
and ConFM energize.

Defrost Diagnosis:

a) Defrost Initiation: Has DTh cooled to 8.6°F (-13°C) or lower? Conrm DTh status.

See "II.D. Thermistor Check." If DTh is in proper range or manual defrost initiated,
conrm Comp and ConFM de-energize. If not, check for 115VAC at CM C1 (R) to
neutral (W). If 115VAC is present and DTh is within proper range, replace CM. If there

is no voltage at CMC1 (R) to neutral (W) and Comp and ConFM do not de-energize,

check for 115VAC at CR #1 (R) to neutral (W). If 115VAC is present at CR #1 (R) to

neutral(W) and DTh is within proper range, replace CR.

b) Defrost Termination: Has DTh warmed to 40°F (4.4°C)? If not yet conrmed,

conrm DTh status. See "II.D. Thermistor Check." If DTh is in proper range, have
Comp and ConFM energized? If not, see "7d) Comp and ConFM Diagnosis"above.

Legend: CM–control module; Comp–compressor; ConFM–condenser fan motor;

CR–compressor relay; CTh–cabinet thermistor; DS–door switch; DSR–door switch
relay; DTh–defrost thermistor; EvapFM–evaporator fan motors;
HPS–high-pressure switch; MH–mullion heater; TXV–thermostatic expansion valve

17

2a. Freezer-Control Module with Remote Display Module

7) Startup/Cool Down–MH and PH energize. There is a slight delay, then Comp, ConFM,
and EvapFM energize. Cabinet temperature appears on DM. Once DTh cools to
32°F(0°C), 4-hr.Comp cumulative run timer starts.

a) MH and PH Diagnosis: Conrm MH and PH energize. Check for 115VAC at MH and

PH. If 115VAC is not present, conrm power supply and continuity of power switch.

If115VAC is present, check amp draw of MH and PH. If an amp reading is not

present, check continuity of MH or PH. If open, replace MH or PH.

b) CM and DM Diagnosis: Cabinet temperature appears on DM. If not, check for

115VACat CM L3 (BK) to CM N5 neutral (W). If 115VAC is not present, check power

switch, power cord connections, and breaker/fuse. Conrm wiring connections are

secure for both CM L3 (BK) (power supply) and CMN5(W) (neutral). If 115VAC is

present and DM is off, conrm display cable connection is secure. If DM is still off,
replace CM and DM with HS kit.

c) EvapFM Diagnosis: Conrm EvapFM energizes. If not, conrm doors are closed and

DS engaged. Next, check for 115VAC at DSR #8 (LBU) to #7neutral(W). If115VAC

is not present, check DS continuity. If DS is engaged and contacts are open, replace

DS. If 115VAC is present, check for 115VAC at CMF6 (BK) to neutral(W). If 115VAC
is not present, replace CM and DM with new HS kit. If115VAC is present, check for
115VAC at DSR #4(DBU) to neutral (W). If 115VAC is not present, check for 115VAC

at DSR #6 (BK) to neutral (W). If 115VAC is present at DSR #6 (BK) to neutral (W)
and not at DSR #4 (DBU) to neutral (W), replace DSR. If 115VAC is present at DSR
#4 (DBU) to neutral (W), check EvapFM blades for binding and EvapFM continuity.

d) Comp and ConFM Diagnosis: Conrm Comp and ConFM energize. Ifnot, check

for 115VAC at CM C1 (R) to neutral (W). If 115VAC is not present, check CTh

status. See "II.D.Thermistor Check." If CTh ohm reading is in proper range, replace

CM and DM with HS kit. If 115VAC is present at CM C1 (R) to neutral (W), check
continuity of HPS. If open, allow time for HPS to reset. If HPS does not reset,

see "e) HPS Activation" below. If HPS is closed, check for 115VAC at CR #5 (GY)
to CR#6neutral(W). If115VAC is present, check for 115VAC at CR#1 (R) to
neutral(W). If 115VAC is not present, replace CR. If 115VAC is present, and ConFM

is energized but Comp is not, check for 115VAC at Comp protector if external
(internal on 1-section, external on 2-section) to neutral (W). If 115VAC is not present,
give time for Comp protector to cool and reset. If Comp protector does not reset,

replace Comp protector. If115VAC is present, check run capacitor, start capacitor,

start relay, and Comp motor windings. If ConFM is not energized, check ConFM fan
blades for binding and motor winding continuity.

If Comp and ConFM are energized and the cabinet does not cool down, check for a
restriction in the refrigeration circuit, correct TXV operation, and correct refrigerant
charge.

e) HPS Activation: Conrm ConFM is energized and fan blade turns freely.

Conrmcondenser coil is not clogged or restricted. Conrm there are no restrictions

in the refrigeration circuit (TXV and drier). 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.

18

8) Cool Down Achieved–CTh cools to 3°F (1.7°C) below setpoint. EvapFM, MH, and
PH continue. Comp and ConFM de-energize. Diagnosis: Conrm Comp and ConFM
de-energize. If not, and Comp and ConFM were energized longer than 2 min., check

CTh status. See "II.D. Thermistor Check." If CTh ohm reading is in range and Comp

and ConFM continue longer than 2 min., check for 115VAC at CM C1 (R) to neutral

(W). If115VAC is present, replace CM and DM with HS kit. If 115VAC is not present and

Comp and ConFM continue, check for 115VAC at CR #1 (R) to neutral (W). If 115VAC is
present, replace CR.

9) Defrost–"dEF" is displayed during defrost. There is a 5-min. minimum defrost time and

a 1-hr.maximum defrost time.

1a) Temperature/Time-Initiated: DTh cools to 32°F (0°C), 4-hr. cumulative Comp run

timer starts. Once DTh is at or below 32°F (0°C) with 4-hr. cumulative Comp run

timer satised (Comp energized more than 4 hrs.), "dEF"appears on DM. MH and

PH continue. DH and DrH energize. Comp, ConFM, and EvapFM de-energize.

1b) Manually-Initiated: To initiate a manual defrost, press and hold the lower button

for 5seconds. "dEF" appears in the display. MH and PH continue. DH and DrH

energize. Comp, ConFM, and EvapFM de-energize.

2a) Temperature/Time Initiated Defrost-Termination:

(1) DTh warms to 59°F (15°C). "dEF," MH, and PH continue. DH and DrH

de-energize. 3-min. Comp/ConFM delay timer starts, 8-min. EvapFM delay timer
starts, and 13-min. temperature display delay timer starts.

(2) 3-min. Comp/ConFM delay timer terminates, Comp, ConFM, and EvapFM

energize.
(3) 5-min. later, EvapFM delay timer terminates and EvapFM energizes.
(4) 5-min. after EvapFM energizes, 13-min. temperature display delay timer

terminates and cabinet temperature appears on DM.

2b) Manually Initiated Defrost-Termination:

(1) DTh warms to 59°F (15°C). MH and PH continue. DH and DrH de-energize.

3-min. Comp delay timer starts, 3-min. EvapFM delay timer starts, and 13-min.

temperature display delay timer starts.
(2) 3-min. Comp and EvapFM delay timers terminate, Comp, ConFM, and EvapFM

energize.
(3) 10 min. after that, 13-min. temperature display delay timer terminates and cabinet

temperature appears on DM.

19

Defrost Diagnosis:

1a) Temperature/Time-Initiated: Has DTh cooled to 32°F (0°C) or lower? Before

proceeding, conrm DTh status. See "II.D. Thermistor Check." Has 4-hr. Comp
cumulative run timer satised?

(1) DM Diagnosis: Conrm "dEF" appears on DM. If not, replace CM and DM with

HS kit.

(2) DH and DrH Diagnosis: Conrm DH and DrH energize. If not, check for 115VAC

at CM H4 (BK) to neutral (W). If 115VAC is not present, replace CM and DM with
HS kit. If 115VAC is present, check DT continuity. If open, let cool and reset. If DT
does not close, replace DT. If DT is closed, check DH and DrH amp draw and
continuity.

(3) Comp and ConFM Diagnosis: Conrm Comp and ConFM de-energize. Ifnot,

check for 115VAC at CM C1 (R) to neutral(W). If 115VAC is present, replace CM
and DM with HS kit. If115VAC is not present and Comp and ConFM continue,

check CR#1 (R) to neutral. If 115VAC is present, replace CR.

(4) EvapFM Diagnosis: Conrm EvapFM de-energizes. If not, check for 115VAC at

CM F6 (BK) to neutral (W). If 115VAC is present, replace CM and DM with HS kit.

1b) Manually-Initiated: After pressing the lower button for 5 sec., check the following:

(1) CM and DM Diagnosis: Conrm "dEF" appears on DM. If not, replace CM and

DM with HS kit.

(2) DH and DrH Diagnosis: Conrm DH and DrH energize. If not, check for 115VAC

at CM H4 (BK) to neutral (W). If 115VAC is not present, replace CM and DM with

HS kit. If115VAC is present, check DT continuity. If open, let cool and reset. If DT

does not close, replace DT. If DT is closed, check DH and DrH amp draw and
continuity.

(3) Comp and ConFM Diagnosis: Conrm Comp and ConFM de-energize.

If not, check for 115VAC at CM C1 (R) to neutral (W). If 115VAC is present,
replace CM and DM with HS kit. If 115VAC is not present and Comp and ConFM

continue, check CR#1(R) to neutral (W). If 115VAC is present, replace CR.

(4) EvapFM Diagnosis: Conrm EvapFM de-energizes. If not, check for 115VAC at

CM F6 (BK) to neutral (W). If 115VAC is present, replace CM and DM with HS kit.

2a) Temperature/Time Initiated Defrost-Termination: Has DTh warmed to 59°F

(15°C)? If not yet conrmed, conrm DTh status. See "II.D. Thermistor Check." If
DTh is in proper range, DHde-energizes and 3 delay timers start. If DTh has not

warmed to 59°F (15°C), check DT and DH continuity. Next, check DH amp draw.

(1) 3-min. Comp delay timer terminates: 3 min. after DH de-energizes, conrm

Comp and ConFM energize. If not, conrm cabinet temperature is warm enough
for Comp and ConFM operation. Next, check for 115VAC at CM C1 (R) to

neutral(W). If 115VAC is not present, check CTh status. See "II.D.Thermistor
Check." If CTh ohm reading is in proper range, replace CM and DM with HS kit.

If 115VAC is present, check for 115VAC at CR #4 (BK) to neutral (W) and

CR#1(R) to neutral (W). If 115VAC is present at CR #4 (BK) to neutral (W) but

not at CR #1 (R) to neutral (W), replace CR. If 115VAC is present at CR #1 (R)
and Comp or ConFM are not energized, check Comp start components, Comp
protector (internal on 1-section, external on 2-section), and Comp motor winding
continuity. If ConFM is not energized, check ConFM fan blades for binding and
motor winding continuity.

20

(2) 8-min. EvapFM delay timer terminates: 5min. after Comp and ConFM

energize, conrm EvapFM energizes. Ifnot, conrm doors are closed and DS

engaged. Next, check for 115VAC at CMF6(BK) to neutral (W). If 115VAC is not
present, replace CM and DM with HSkit. If 115VAC is present, check for 115VAC

at DSR #4 (DBU) to neutral (W).
If 115VAC is not present, check for 115VAC at DSR #6 (BK) to neutral (W).
If 115VAC is present on DSR #6 (BK) to neutral (W) and not on DSR #4 (DBU) to
neutral (W), replace DSR. If 115VAC is present on DSR #4 (DBU) to neutral (W)
and EvapFM is not energized, check EvapFM blades for binding and EvapFM
continuity.

(3) 13-min. temperature display delay timer terminates: 5 min. after EvapFM

energizes, "dEF" is replaced by cabinet temperature on display. If not, replace
CM and DM with HSkit.

2b) Manually Initiated Defrost-Termination: Has DTh warmed to 59°F (15°C)? If not

yet conrmed, conrm DTh status. See "II.D. Thermistor Check." If DTh is in proper
range, DHde-energizes and 3 delay timers start. If DTh has not warmed to 59°F

(15°C), check DT and DH continuity. Next, check DH amp draw.

(1) 3-min. Comp/ConFM and EvapFM delay timers terminate: 3 min. after DH

de-energizes, conrm Comp, ConFM, and EvapFM energize. If Comp and
ConFM do not energize, conrm cabinet temperature is warm enough for Comp
and ConFM operation.

Comp and ConFM: Check for 115VAC at CM C1 (R) to neutral(W). If 115VAC
is not present, check CTh status. See "II.D.Thermistor Check." If CTh ohm

reading is in proper range, replace CM and DM with HS kit. If 115VAC is present,

check for 115VAC at CR #4 (BK) to neutral (W) and CR#1(R) to neutral (W).
If115VAC is present at CR #4 (BK) to neutral (W) but not at CR #1 (R) to neutral

(W), replace CR. If 115VAC is present at CR #1 (R) and Comp or ConFM are not
energized, check Comp start components, Comp protector (internal on 1-section,
external on 2-section), and Comp motor winding continuity. If ConFM is not
energized, check ConFM fan blades for binding and motor winding continuity.

EvapFM: Conrm EvapFM energizes. Ifnot, conrm doors are closed and DS
engaged. Next, check for 115VAC at CMF6(BK) to neutral (W). If 115VAC is not
present, replace CM and DM with HSkit. If 115VAC is present, check for 115VAC

at DSR #4 (DBU) to neutral (W). If 115VAC is not present, check for 115VAC at
DSR #6 (BK) to neutral (W). If 115VAC is present on DSR #6 (BK) to neutral (W)
and not on DSR #4 (DBU) to neutral (W), replace DSR. If 115VAC is present
on DSR #4 (DBU) to neutral (W) and EvapFM is not energized, check EvapFM
blades for binding and EvapFM continuity.

(2) 13-min. temperature display delay timer terminates: 10 min. after Comp,

ConFM, and EvapFM energize, "dEF" is replaced by cabinet temperature on
display. If not, replace CM and DM with HSkit.

Legend: CM–control module; Comp–compressor; ConFM–condenser fan motor;

CR–compressor relay; CTh–cabinet thermistor; DH–defrost heater;
DM–display module; DrH–drain heater; DSR–door switch relay;
DT–defrost thermostat; DTh–defrost thermistor; EvapFM–evaporator fan motors;
HPS–high-pressure switch; MH–mullion heater; PH–perimeter heater;
TXV–thermostatic expansion valve

21

2b. Freezer-Control Module with Integrated Display

7) Startup/Cool Down– MH and PH energize. There is a slight delay, then Comp, ConFM,
and EvapFM energize. Cabinet temperature appears on display. Once DTh cools to
32°F (0°C), 4-hr.Comp cumulative run timer starts.

a) MH and PH Diagnosis: Conrm MH and PH energize. Check for 115VAC at MH and

PH. If 115VAC is not present, conrm power supply and continuity of power switch.
If 115VAC is present, check amp draw of MH and PH. If an amp reading is not
present, check continuity of MH or PH. If open, replace MH or PH.

b) CM Diagnosis: Cabinet temperature appears on display. If not, check for 115VAC

at CM L2 (BK) to CM N3 neutral (W). If 115VAC is not present, conrm wiring
connections are secure on CM L2 (BK) (power supply) and CM N3 (W) (neutral).

If115VAC is present and display is off, replace CM.

c) EvapFM Diagnosis: Conrm EvapFM energizes. If not, conrm doors are closed

and DS engaged. Next, check for 115VAC at DSR #8 (LBU) to DSR#7neutral (W).

If 115VAC is not present, check DS continuity. If DS is engaged and contacts are

open, replace DS. If 115VAC is present, check for 115VAC at CM F5(Y) to neutral
(W). If 115VAC is not present, replace CM. If115VAC is present, check for 115VAC
at DSR #4 (DBU) to neutral (W). If115VAC is not present, check for 115VAC at DSR
#6 (Y) to neutral (W). If115VAC is present at DSR #6 (Y) to neutral (W) and not at
DSR #4 (DBU) to neutral (W), replace DSR. If 115VAC is present at DSR#4(DBU)

to neutral (W), check EvapFM blades for binding and EvapFM continuity.

d) Comp and ConFM Diagnosis: Conrm Comp and ConFM energize. If not, check for

115VAC at CM C1 (R) to neutral (W). If 115VAC is not present, check CTh status.

See "II.D.Thermistor Check." If CTh ohm reading is in proper range, replace CM. If
115VAC is present at CM C1 (R) to neutral (W), check continuity of HPS. Ifopen,
allow time for HPS to reset. If HPS does not reset, see "e) HPS Activation" below.
If HPS is closed, check for 115VAC at CR #5 (GY) to CR #6 neutral(W). If115VAC
is present, check for 115VAC at CR #1 (R) to neutral(W). If115VAC is not present,
replace CR. If115VAC is present and ConFM is energized but Comp is not,

check for 115VAC at Comp protector if external (internal on 1-section, external on
2-section) to neutral (W). If 115VAC is not present, give time for Comp protector to

cool and reset. If Comp protector does not reset, replace Comp protector. If115VAC

is present, check run capacitor, start capacitor, start relay, and Comp motor
windings. If ConFM is not energized, check ConFM fan blades for binding and motor
winding continuity.

If Comp and ConFM are energized and the cabinet does not cool down, check for a

restriction in the refrigeration circuit, correct TXV operation, and correct refrigerant
charge.

e) HPS Activation: Conrm ConFM is energized and fan blade turns freely. Conrm

condenser coil is not clogged or restricted. Conrm there are no restrictions in the
refrigeration circuit (TXV and drier). 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.

22

8) Cool Down Achieved–CTh cools to 3°F (1.7°C) below setpoint. EvapFM, MH, and
PH continue. Comp and ConFM de-energize. Diagnosis: Conrm Comp and ConFM
de-energize. If not, and Comp and ConFM were energized longer than 2 min., check

CTh status. See "II.D. Thermistor Check." If CTh ohm reading is in proper range and

Comp and ConFM continue longer than 2 min., check for 115VAC at CM C1 (R) to

neutral (W). If115VAC is present, replace CM. If 115VAC is not present and Comp and
ConFM continue, check CR#1(R) to neutral (W). If 115VAC is present, replace CR.

9) Defrost–The defrost icon turns on and "dEF" is displayed during defrost. There is a
5-min. minimum defrost time and a 1-hr.maximum defrost time.

1a) Temperature/Time-Initiated: DTh cools to 32°F (0°C), 4-hr. cumulative Comp

run timer starts. Once DTh is at or below 32°F (0°C) with 4-hr. cumulative Comp

run timer satised (Comp energized more than 4 hrs.), defrosticon turns on and
"dEF"is displayed. MHand PH continue. DH and DrH energize. If on, Comp and

EvapFM icons turn off. Comp, ConFM, and EvapFM de-energize.

1b) Manually-Initiated: To initiate a manual defrost, press the manual defrost button

on display. Comp and EvapFM icons turn off. Defrost icon turns on and "dEF" is
displayed. MHand PH continue. DH and DrH energize, Comp and EvapFM icons

turn off, Comp, ConFM, and EvapFM de-energize.

2a) Temperature/Time Initiated Defrost-Termination:

(1) DTh warms to 59°F (15°C). Defrost icon, "dEF," MH, and PH continue. DHand

DrH de-energize. 3-min. Comp delay timer starts, 7-min. EvapFM delay timer
starts, and 18-min. temperature display delay timer starts.

(2) 3-min. Comp delay timer terminates. "dEF," MH, and PH continue. Defrost icon

turns off and Comp icon turns on and Comp and ConFM energize.

(3) 4 min. later, 7-min. EvapFM delay timer terminates. Comp, ConFM, "dEF," MH,

and PH continue. EvapFM icon turns on and EvapFM energizes. Note that the
7-min. EvapFM delay time is a maximum; if the defrost thermistor cools to 25°F
(-3.9°C) before the 7-min. EvapFM delay timer terminates, EvapFM icon turns on
and EvapFM energizes.

(4) 11-min. later, 18-min. temperature display delay timer terminates. "dEF" is

replaced by cabinet temperature.

2b) Manually Initiated Defrost-Termination:

(1) DTh warms to 59°F (15°C). Defrost icon, "dEF," MH, and PH continue. DH and

DrH de-energize. 3-min. Comp, ConFM, and EvapFM delay timer starts, and
15-min. temperature display delay timer starts.

(2) 3-min. Comp, ConFM, and EvapFM delay timer terminates. "dEF," MH, and PH

continue. Defrost icon turns off, Comp and EvapFM icons turn on, and Comp,
ConFM, and EvapFM energize.

(3) 12-min. later, 15 min. temperature display timer terminates. "dEF" is replaced by

cabinet temperature.

23

Defrost Diagnosis:

1a) Temperature/Time-Initiation: Has DTh cooled to 32°F (0°C) or lower? Before

proceeding, conrm DTh status. See "II.D. Thermistor Check." Has 4-hr. Comp
cumulative run timer satised?

(1) CM Diagnosis: Conrm defrost icon turns on, "dEF" is displayed, and Comp and

EvapFM icons turn off. If not, replaceCM.

(2) DH and DrH Diagnosis: Conrm DH and DrH energize. If not, check for 115VAC

at CM H4 (O) to neutral (W). If 115VAC is not present, replace CM. If115VAC is

present, check DT continuity. If open, let cool and reset. If DT does not close,
replace DT. If DT is closed, check DH and DrH amp draw and continuity.

(3) Comp and ConFM Diagnosis: Conrm Comp and ConFM de-energize.

If not, check for 115VAC at CM C1 (R) to neutral (W). If 115VAC is present,
replace CM. If 115VAC is not present and Comp and ConFM continue, check

CR#1(R) to neutral (W). If 115VAC is present, replace CR.

(4) EvapFM Diagnosis: Conrm EvapFM de-energizes. If not, check for 115VAC at

CM F5 (Y) to neutral (W). If 115VAC is present, replace CM.

1b) Manual-Initiation: After pressing the manual defrost button, check the following:

(1) CM Diagnosis: Conrm Comp and EvapFM icons turn off, defrost icon turns on,

and "dEF" is displayed. If not, replace CM.

(2) DH and DrH Diagnosis: Conrm DH and DrH energize. If not, check for 115VAC

at CM H4 (O) to neutral (W). If 115VAC is not present, replace CM. If115VAC is

present, check DT continuity. If open, let cool and reset. If DT does not close,
replace DT. If DT is closed, check DH and DrH amp draw and continuity.

(3) Comp and ConFM Diagnosis: Conrm Comp and ConFM de-energize.

If not, check for 115VAC at CM C1 (R) to neutral (W). If 115VAC is present,
replace CM. If 115VAC is not present and Comp and ConFM continue, check

CR#1(R) to neutral (W). If 115VAC is present, replace CR.

(4) EvapFM Diagnosis: Conrm EvapFM de-energizes. If not, check for 115VAC at

CM F5 (Y) to neutral (W). If 115VAC is present, replace CM.

2a) Temperature/Time Initiated Defrost-Termination: Has DTh warmed to 59°F

(15°C)? If not yet conrmed, conrm DTh status. See "II.D. Thermistor Check." If
DTh is in proper range, DHde-energizes and 3 delay timers start. If DTh has not

warmed to 59°F (15°C), check DT and DH continuity. Next, check DH amp draw.

(1) 3-min. Comp delay timer terminates: 3 min. after DH de-energizes, conrm

defrost icon turns off, Comp icon turns on, and Comp and ConFM energize.
If not, conrm cabinet temperature is warm enough for Comp and ConFM

operation. Next, check for 115VAC at CM C1 (R) to neutral(W). If 115VAC is not
present, check CTh status. See "II.D.Thermistor Check." If CTh ohm reading is in
proper range, replace CM. If 115VAC is present, check for 115VAC at CR #4(BK)
to neutral (W) and CR#1(R) to neutral (W). If 115VAC is present at CR #4 (BK)
to neutral (W) but not at CR #1(R) to neutral (W), replace CR. If 115VAC is

present at CR #1 (R) and Comp or ConFM are not energized, check Comp start
components, Comp protector (internal on 1-section, external on 2-section), and
Comp motor winding continuity. If ConFM is not energized, check ConFM fan
blades for binding and motor winding continuity.

24

(2) 7-min. EvapFM delay timer terminates: (note that the 7-min. EvapFM delay time

is a maximum; if the defrost thermistor cools to 25°F (-3.9°C) before the 7-min.
EvapFM delay timer terminates, EvapFM icon turns on and EvapFM energizes):

4min. after Comp and ConFM energize, conrm EvapFM icon turns on and

EvapFM energizes. If not, conrm doors are closed and DS engaged. Next,

check for 115VAC at CMF5 (Y) to neutral (W). If 115VAC is not present, replace

CM.

If 115VAC is present, checkfor 115VAC at DSR#4(DBU) to neutral(W).
If115VAC is not present, check for 115VAC at DSR#6(BK) to neutral (W).
If115VAC is present on DSR #6 (BK) to neutral (W)and not on DSR #4(DBU) to

neutral (W), replace DSR. If 115VAC is present on DSR #4 (DBU) to neutral (W)
and EvapFM is not energized, check EvapFM blades for binding and EvapFM
continuity.

(3) 18-min. temperature display delay timer terminates: 11 min. after EvapFM

energizes, "dEF" is replaced by cabinet temperature on display. If not, replace

CM.

2b) Manually Initiated Defrost-Termination: Has DTh warmed to 59°F (15°C)? If not

yet conrmed, conrm DTh status. See "II.D. Thermistor Check." If DTh is in proper
range, DHde-energizes and 2 delay timers start. If DTh has not warmed to 59°F

(15°C), check DT and DH continuity. Next, check DH amp draw.

(1) 3-min. Comp/ConFM and EvapFM delay timers terminate: 3 min. after DH

de-energizes, conrm defrost icon turns off, Comp and EvapFM icons turn on,
and Comp, ConFM, and EvapFM energize. If not, conrm cabinet temperature is
warm enough for Comp and ConFM operation.

Comp and ConFM: Check for 115VAC at CM C1 (R) to neutral(W). If 115VAC is
not present, check CTh status. See "II.D.Thermistor Check." If CTh ohm reading

is in proper range, replace CM. If 115VAC is present, check for 115VAC at CR

#4(BK) to neutral (W) and CR#1(R) to neutral (W). If 115VAC is present at CR
#4 (BK) to neutral (W) but not at CR #1(R) to neutral (W), replace CR. If 115VAC

is present at CR #1 (R) and Comp or ConFM are not energized, check Comp
start components, Comp protector (internal on 1-section, external on 2-section),
and Comp motor winding continuity. If ConFM is not energized, check ConFM
fan blades for binding and motor winding continuity.
EvapFM: Conrm EvapFM icon turns on and EvapFM energizes. If not, conrm

doors are closed and DS engaged. Next, check for 115VAC at CMF5 (Y) to
neutral (W). If 115VAC is not present, replace CM. If 115VAC is present, checkfor
115VAC at DSR#4(DBU) to neutral(W). If115VAC is not present, check for
115VAC at DSR#6(BK) to neutral (W). If115VAC is present on DSR #6 (BK) to
neutral (W) and not on DSR #4(DBU) to neutral (W), replace DSR. If 115VAC is

present on DSR #4 (DBU) to neutral (W) and EvapFM is not energized, check
EvapFM blades for binding and EvapFM continuity.

(2) 15-min. temperature display delay timer terminates: 12 min. after Comp,

ConFM, and EvapFM energize, "dEF" is replaced by cabinet temperature on

display. If not, replace CM.

Legend: CM–control module; Comp–compressor; ConFM–condenser fan motor;

CR–compressor relay; CTh–cabinet thermistor; DH–defrost heater;
DrH–drain heater; DSR–door switch relay; DT–defrost thermostat; DTh–defrost
thermistor; EvapFM–evaporator fan motors; HPS–high-pressure switch;
MH–mullion heater; PH–perimeter heater; TXV–thermostatic expansion valve

25

C. Control Module Check

1. Control Module with Remote Display Module

Before replacing CM that does not show a visible defect and that you suspect is
bad, conduct the following check procedure. This procedure will help you verify your
diagnosis. Always choose a neutral (W) to establish a good neutral connection when
checking high voltages. Also, conrm there is a good power supply and neutral

connection to CM: 115VAC at CM L3(BK) to neutral CM N5 (W).

Alarm Reset: To silence an alarm, press and release the upper or lower button with

power on. For alarm information, see "III.D. Alarm Safeties."

NOTICE! When replacing the display module or control module on appliances with
a control module with remote display module, a conversion kit must be ordered:
Refrigerator: HS-5079; Freezer: HS-5078.

Startup/Cool Down

1) Check all wiring connections. Conrm DM cable, CTh, and DTh are properly connected.

2) Move the power switch to the "ON" position.

3) Check for 115VAC at CM L3 (BK) to CM N5 neutral (W). If 115VAC is not present, check
power supply, wiring connections, and power switch continuity.

4) Check that the cabinet temperature is displayed on DM. If not and DM cable is
connected, replace DM and CM with HS kit.

5) Freezer: Check that EvapFM is energized. Make sure doors are closed and DS
engaged. Next, check for 115VAC at CM F6 (BK) to neutral (W). If 115VAC is not
present, replace DM and CM with HS kit.

6) Check that Comp and ConFM energize. If not, check CTh status. See "II.D.Thermistor
Check." If CTh ohm reading is in proper range, check for 115VAC at CM C1 (R) to

neutral (W). If 115VAC is not present, replace DM and CM with HS kit.

Defrost

7) Manual Defrost Check: Press and hold the lower button until "dEF" appears on DM.

8) Conrm Comp, ConFM, and EvapFM (freezer) de-energize. Check for 115VAC at CM
C1 (R) to neutral (W) for Comp and ConFM, then at CM F6 (BK) (freezer) to neutral (W)

for EvapFM. If "dEF" is displayed and 115VAC is present, replace DM and CM with HS

kit.

9) Freezer: Conrm DH energizes. Check for 115VAC at CM H4 (BK) to neutral (W).

If "dEF" is displayed and 115VAC is not present, replace DM and CM with HS kit.

26

10) Check that the components restart after defrost termination.

Refrigerator: DTh reaches 40°F (4.4°C), Comp and ConFM (CM C1 (R)) energize.

If not, check DTh status. See "II.D.Thermistor Check." If DTh ohm reading is in proper

range, and Comp and ConFM do not energize, replace DM and CM with HS kit.

Freezer: DTh reaches 59°F (15°C). 3-min. later, Comp and ConFM (CM C1 (R)) and

EvapFM (CM F6 (BK)) energize. If not, check DTh status. See "II.D.Thermistor Check."

If DTh ohm reading is in proper range, and Comp, ConFM, or EvapFM do not energize,

replace DM and CM with HS kit. 10min. after Comp, ConFM, and EvapFM energize,

conrm cabinet temperature appears on DM. If components fail to start, replace DM
and CM with HS kit.

Legend: CM–control module; Comp–compressor; ConFM–condenser fan motor;

CTh–cabinet thermistor; DH–defrost heater; DM–display module; DS–door switch
DTh–defrost thermistor; EvapFM–evaporator fan motors

2. Control Module with Integrated Display

Before replacing CM that does not show a visible defect and that you suspect is
bad, conduct the following check procedure. This procedure will help you verify your
diagnosis. Always choose a neutral (W) to establish a good neutral connection when
checking high voltages. Also, conrm there is a good power supply and neutral
connection to CM: 115VAC at CM L2 (BK) to CM N3 (W).

Alarm Reset: To silence the alarm, press and release the up button with power on.

Foralarm information, see "III.D. Alarm Safeties."

Startup/Cool Down

1) Check all wiring connections. Conrm the CTh and DTh are properly connected.

2) Move the power switch to the "ON" position.

3) Check for 115VAC at CM L2 (BK) to CM N3 neutral (W). If 115VAC is not present, check
power supply, wire connections, and power switch.

4) Check that cabinet temperature is displayed. If not, replace CM.

5) Freezer: Check that EvapFM is energized. Make sure doors are closed and DS
engaged. Next, check for 115VAC at CM F5 (Y) to neutral. If 115VAC is not present,
replace CM.

6) Check that Comp and ConFM energize. If not, check CTh status. See "II.D.Thermistor
Check." If CTh ohm reading is in proper range, check for 115VAC at CM C1 (R) to

neutral (W). If 115VAC is not present, replace CM.

Defrost

7) Manual Defrost Check: Press the manual defrost button briey. If on, Comp and
EvapFM icons turn off. Defrosticon turns on and "dEF" is displayed.

8) Conrm Comp, ConFM, and EvapFM (freezer) de-energize. Check for 115VAC at CM
C1 (R) to neutral (W) for Comp and ConFM, then at CM F5 (Y) (freezer) to neutral (W)

for EvapFM. If"dEF" is displayed and 115VAC is present, replace CM.

9) Freezer: Conrm DH energizes. Check for 115VAC at CM H4 (O) to neutral (W). If"dEF"

is displayed and 115VAC is not present, replace CM.

27

10) Check that the components restart after defrost termination.

Refrigerator: DTh reaches 40°F (4.4°C), Comp and ConFM (CM C1 (R)) energize. If

not, check DTh status. See "II.D.Thermistor Check." If DTh ohm reading is in proper

range, and Comp and ConFM do not energize, replace CM.

Freezer: DTh reaches 59°F (15°C). 3-min. later, Comp and ConFM (CM C1 (R)) and

EvapFM (CM F5 (Y)) energize. If not, check DTh status. See "II.D.Thermistor Check." If

DTh ohm reading is in proper range, and Comp, ConFM, or EvapFM do not energize,

replaceCM. 12min. after Comp, ConFM, and EvapFM energize, cabinet temperature

appears on CM. If components fail to start, replace CM.

Legend: CM–control module; Comp–compressor; ConFM–condenser fan motor;

CTh–cabinet thermistor; DH–defrost heater; DS–door switch; DTh–defrost
thermistor; EvapFM–evaporator fan motors

D. Thermistor Check

The cabinet thermistor is used for cabinet temperature control and the defrost thermistor
is used for defrost cycle initiation and termination. Thermistor resistance varies
depending on temperature. The control module monitors the thermistors to control
system operation. No adjustment is required.
In the event the cabinet thermistor reading is out of range (E1 alarm), the compressor
operates on a xed time basis of 5-min. on and 5-min. off.

In the event the refrigerator defrost thermistor reading is out of range (E2alarm), defrost

initiation occurs every 4-hr. of cumulative compressor run time and terminates on
20-min. minimum defrost timer.
In the event the freezer defrost thermistor reading is out of range (E2 alarm), defrost
initiation occurs every 4-hr. of cumulative compressor run time and terminates based on
cabinet thermistor temperature.

To check thermistor resistance, follow the steps below.

1) Move the power switch to the "OFF" position, then unplug the appliance.

2) Remove the control box cover.

3) Disconnect and remove the thermistor in question.

4) Immerse the thermistor sensor portion in a glass containing ice and water for 2 to 3 min.

5) Check the resistance between the wires at the thermistor connector. Normal reading is
within 16.0 to 16.7 kΩ. If outside the normal reading, replace the thermistor.

6) Reconnect and replace the thermistor in its correct position. See "IV.B. Important Notes
for Component Replacement."

7) Plug the appliance back in. Move the power switch to the "ON" position.

28

E. Diagnostic Tables

Check for correct appliance installation per the instruction manual and proper voltage per
appliance nameplate.

1. Not Cooling

Not Cooling - Possible Cause

Power Supply

1.

Cord and Plug

2.
On three-section model, check
receptacle box cord and plug and
one-section and two-section cords
and plugs.

Power Switch (control box)

3.

Wiring

4.

Control Module

5.

See "III.D. Alarm Safeties" and "II.C.
Control Module Check."

Door Switch

6.

Door Switch Relay

7.

Evaporator Fan Motor

8.

High-Pressure Switch

9.

Compressor Relay

10.

Compressor Protector

11.

Compressor

12.

Condenser

13.

Evaporator

14.

See "2. Evaporator Frozen Up."

Refrigerant/Refrigerant Lines

15.

Unplugged, off, blown fuse, tripped or defective circuit breaker. On

a)

three-section receptacle box, only top receptacles have power.
Loose connection.

b)

Not within specications.

c)

Loose connection.

a)

Defective.

b)

"OFF" position.

a)

Defective.

b)

Loose connection.

a)

Faulty.

b)

In alarm or "- - -" shown on display module on models with remote display

a)

module.
Defective.

b)

Not engaged.

a)

Defective.

b)

Loose connection.

a)

Defective.

b)

Defective.

a)

Dirty condenser.

a)

Ambient temperature too warm.

b)

Condenser fan motor not operating.

c)

Refrigerant overcharge.

d)

Refrigerant lines or components restricted.

e)

Defective.

f)

Defective.

a)

Dirty condenser.

a)

Condenser fan motor not operating.

b)

Compressor capacitor or start relay defective.

c)

Defective.

d)

Defective.

a)

Dirty.

a)

Clogged or frozen.

a)

Refrigerant leak.

a)

Refrigerant lines restricted.

b)

29

2. Evaporator Frozen Up

Evaporator Frozen Up - Possible Cause

Evaporator

1.

Evaporator Fan Motor

2.

Defrost Thermistor

3.

Control Module

4.

5. Compressor Relay a) Defective.

Refrigerant Charge/Refrigerant

6.
Lines

Defrost Heater (freezer)

7.

Defrost Thermostat Open (freezer)

8.

Dirty.

a)

Fan blades binding.

a)

Defective.

b)

Out of position or defective.

a)

Defective.

a)

Low.

a)

Component restriction (TXV, cap tube, drier).

b)

Defective.

a)

Defective.

a)

3a. Defrost: Control Module with Remote Display Module

Refrigerator Defrost Fails to Initiate - Possible Cause

1. Defrost Thermistor (Conrm

DTh status. See "II.D. Thermistor
Check.")

2. Control Module a) Defective.

Refrigerator Defrost Fails to Terminate - Possible Cause

1. Defrost Thermistor (Conrm

DTh status. See "II.D. Thermistor
Check.")

2. Compressor Relay a) Defective.

3. Control Module a) Defrost thermistor connection loose.

a) Defrost initiation temperature 8.6°F (-13°C) not achieved. See "1. Not

Cooling."

b) Out of position or defective.

a) Defrost termination temperature 40°F (4.4°C) not achieved.

b) Defective.

b) Defective.

Freezer Defrost Fails to Initiate - Possible Cause

Defrost Thermistor (Conrm

1.

DTh status. See "II.D. Thermistor
Check.")

Compressor 4-hr. cumulative run

2.
timer not satised.

Control Module

3.

Freezer Defrost Fails to Terminate - Possible Cause

Defrost Thermistor (Conrm

1.

DTh status. See "II.D. Thermistor
Check.")

Defrost Heater

2.

Compressor Relay

3.

Control Module

4.

Defrost initiation temperature 32°F (0°C) not achieved. See "1. Not

a)

Cooling."

Out of position or defective.

b)

Check compressor operation. See "1. Not Cooling."

a)

Defective.

a)

Defrost termination temperature 59°F (15°C) not achieved.

a)

Defrost thermistor connection loose.

b)

Defrost thermostat defective.

a)

Defective.

b)

Defective.

a)

Defective.

a)

30

3b. Defrost: Control Module with Integrated Display

Refrigerator Defrost Fails to Initiate - Possible Cause

1. Defrost Thermistor (Conrm

DTh status. See "II.D. Thermistor
Check.")

2. Compressor Relay a) Defective.

3. Control Module a) Defective.

Refrigerator Defrost Fails to Terminate - Possible Cause

1. Defrost Thermistor (Conrm

DTh status. See "II.D. Thermistor
Check.")

2. Compressor Relay a) Defective.

3. Control Module a) Defrost thermistor connection loose.

Freezer Defrost Fails to Initiate - Possible Cause

Defrost Thermistor (Conrm

1.

DTh status. See "II.D. Thermistor
Check.")

Compressor 4-hr. cumulative run

2.
timer not satised.

Control Module

3.

Freezer Defrost Fails to Terminate - Possible Cause

Defrost Thermistor (Conrm

1.

DTh status. See "II.D. Thermistor
Check.")

Defrost Heater

2.

Compressor Relay

3.

Control Module

4.

a) Defrost initiation temperature 8.6°F (-13°C) not achieved. See "1. Not

Cooling."

b) Out of position or defective.

a) Defrost termination temperature 40°F (4.4°C) not achieved.

b) Defective.

b) Defective.

Defrost initiation temperature 32°F (0°C) not achieved. See "1. Not

a)

Cooling."

Out of position or defective.

b)

Check compressor operation. See "1. Not Cooling."

a)

Defective.

a)

Defrost termination temperature 59°F (15°C) not achieved.

a)

Defrost thermistor connection loose.

b)

Defrost thermostat defective.

a)

Defective.

b)

Defective.

a)

Defective.

a)

31

III. Controls and Adjustments

A. Control and Display Modules

When the power switch is moved to the "ON" position there is a slight delay, then the

current cabinet temperature is displayed. From the display module, the cabinet setpoint
and temperature display scale can be changed.

Note: When exposed to high temperatures, a high-temperature alarm "Hi" may occur at

start-up. To silence the alarm, press and release the upper button. Alarm clears

once temperature is within factory parameters. For details, see"III.D.Alarm
Safeties."

1. Control Module with Remote Display Module

a) Remote Display Module Layout

Display Module

To Control Module

Display Cable

LED Display

Upper and Lower
Buttons

Fig. 2

32

b) Control Module with Remote Display Module Connections

All models are pretested and factory set

.

NOTICE

• The control module is fragile, handle very carefully.

• Do not change wiring and connections. Never misconnect terminals.

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

Refrigerator Control Module

To Display Module

Display Cable

Defrost Thermistor

Cabinet Thermistor

Freezer Control Module

To Display Module

Display Cable

Defrost Thermistor

Cabinet Thermistor

N5 Neutral (W)

L3 Power Supply (BK)

C1 Compressor (R)

Fig. 3

33

F6 Evaporator Fan
Motor (BK)

N5 Neutral (W)

H4 Defrost Heater (BK)

L3 Power Supply (BK)

C1 Compressor (R)

2. Control Module with Integrated Display

All models are pretested and factory set

.

NOTICE

• The control module is fragile, handle very carefully.

• Do not change wiring and connections. Never misconnect terminals.

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

a) Display Icons

Control Module Icons

Icon Meaning

Compressor

Compressor running.

Defrost

Appliance is in defrost cycle. See "II.B. Service Diagnosis" for details.

Evaporator Fan Motor (Icon is Applicable to Freezers Only)

Evaporator fan motor is running. Evaporator fan motor de-energizes when door is open and
when appliance is in defrost.

Alarm

Appliance is in alarm. See "III.D. Alarm Safeties" for details.

b) Display Layout

Manual
Defrost
Button

Compressor Icon

SC

SC
Button

Defrost
Icon

ECO

Evaporator Fan
Motor Icon

°C
°F

Alarm
Icon

Up
Button

V

V

Down
Button

Front
Panel

34

c) Control Module with Integrated Display Connections

Cabinet Thermistor

Defrost Thermistor

Cabinet Thermistor Defrost Thermistor

C1 Compressor (R)

L2 Power Supply (BK)

N3 Neutral (W)

F5 Evaporator Fan Motor (Y)

(Freezer)
H4 Defrost Heater (O)
(Freezer)

35

B. Temperature

The temperature default scale is °F, but it can be changed to read °C. To change,

see "III.B.3. Changing the Temperature Display Scale (°F or °C)" below.

1. Default Settings

a) Temperature Setting: Refrigerator: 36°F (2°C).
Freezer: -4°F (-20°C).
b) Temperature Display Scale: °F.

Note: CM with remote DM: Pressing the upper and lower button at the same time for

5 sec. (or until "- - -" appears on the display module), turns the compressor,

condenser fan motor, and evaporator fan motor (freezer) off. To turn the appliance
on again, press the upper and lower button together for 5 sec. until the cabinet
temperature appears on the display module. NOTICE! The three dashes must

be cleared, otherwise the compressor will not run and product will be lost.

2. Temperature Setpoint

The temperature setpoint is the value for the average cabinet temperature. The
temperature differential for the compressor to turn on and off is ±3°F (±1.7°C) of the
temperature setpoint. For example, for a refrigerator temperature setpoint of 36°F (2°C),
the compressor comes on at 39°F (3.7°C), and the compressor goes off at 33°F (0.3°C).
If necessary, adjust the temperature setpoint as follows:

1) Press and hold the upper or lower button briey, then release. The current temperature
setpoint ashes.

2) Press the upper or lower button until the desired value is displayed. After a few sec.,
the display returns to the current cabinet temperature and the temperature setpoint is
saved.

• For refrigerators, the temperature setpoint is adjustable between 34°F and 52°F
(1°Cand 11°C). Factory default is 36°F (2°C).

• For freezers, the temperature setpoint is adjustable between -15°F and +12°F
(-26°Cand -11°C). Factory default is -4°F (-20°C).

Note: Do not adjust the temperature setpoint outside of the factory-specied range.

Adjustment outside of this range may prevent the appliance from operating
correctly.

3. Changing the Temperature Display Scale (°F or °C)

a) Control Module with Remote Display Module

To change the temperature display scale, follow the steps below.

1) Press the upper button for 5 sec. The current setting is displayed.

2) Press the upper button to change the scale. After a few sec., the display returns to the
current cabinet temperature and the setting is saved. The factory default is °F.

36

b) Control Module with Integrated Display

EHE

To change the temperature display scale, follow the steps below.

1) Press and hold both the up and down buttons for 5 sec. "PAS" appears briey in the
display, then "000" appears.

2) Press the up button to change the display to "001".

3) Press the SC button. "
"diS" is displayed.

4) Press the SC button. "CFu" appears in the display. Press the SC button again. The

current temperature display scale setting appears.

5) Press the up or down button to change the temperature display scale.

6) Press the SC button to save the setting. Wait 1 min. or press the manual defrost button
twice to return to the temperature display.

" appears in the display. Press the up or down button until

C. Defrost

1. Control Module with Remote Display Module

To initiate a manual defrost, press and hold the lower button for 5sec. "dEF" appears

in the display.

2. Control Module with Integrated Display

To initiate a manual defrost, press the manual defrost button briey. The defrost icon
and "dEF" appear in the display.

37

D. Alarm Safeties

Alarm signals are designed to protect the appliance and food product. These alarms
give information or warnings in the event the appliance is operating out of acceptable
parameters. Should one of the alarms occur, follow the instructions in the table below

to address the alarm. The alarm code ashes once every second with audible alarm. To

silence the alarm, press and release the upper button.

1. Control Module with Remote Display Module

Alarm Signals

Alarm Code Problem Corrective Action/Reset Details

Cabinet Thermistor Malfunction Alarm

E1

E2

UHi

ULo

Hi

Cabinet thermistor has failed.

Defrost Thermistor Malfunction Alarm

Defrost thermistor has failed.

High-Voltage Alarm (135VAC
more)

Low-Voltage Alarm (96VAC

High-Temperature Alarm
Note: When power is turned on, a
high-temperature alarm may occur.

Refrigerator: Cabinet temperature has
exceeded the setpoint temperature by
10°F (5.6°C) for more than 2 hr.

±5% or

±5% or less)

Cabinet thermistor disconnected, shorted, or open.
Check connection and continuity. Reconnect or
replace as needed.

Unit cycles 5-min. on, 5-min. off.

Defrost thermistor disconnected, shorted, or open.
Check connection and continuity. Reconnect or
replace as needed.

Unit cycles on and off with cabinet thermistor.

The compressor de-energizes if voltage protection
operates. The voltage safeties automatically reset
when voltage is corrected.

First try obvious corrections such as closing doors
and cleaning the condenser.

Automatically resets when temperature returns to
normal.

Lo

E13

"– – –"

Freezer: Cabinet temperature has
exceeded the setpoint temperature by
27°F (15°C) for more than 2 hr.

Low-Temperature Alarm

Refrigerator & Freezer: Cabinet
temperature has remained below the
setpoint temperature by 8°F (4.4°C) for
more than 2 hr.

Communication Error Alarm

Communication between the control
module and the display module has been
interrupted or disconnected.

Compressor Off Unit (compressor) off.

Automatically resets when temperature returns to
normal.

Check the connections at the control module
and the display module. If connections are good,
the control module and display module must be
replaced.

The unit operates on a set 5-min. on, 5-min. off cycle
until communication is restored.

Press and hold the upper and lower buttons until the
temperature appears on the display.

38

2. Control Module with Integrated Display

Alarm Signals

Alarm Code Problem Corrective Action/Reset Details

E01

E02

Hi

Lo

Cabinet Thermistor Malfunction Alarm

Cabinet thermistor has failed.

Defrost Thermistor Malfunction Alarm

Defrost thermistor has failed.

High Temperature Alarm

Refrigerator: Cabinet temperature has
remained above 57°F (13.9°C) for more

than 2hr.

Freezer: Cabinet temperature has
remained above 26°F (-3.3°C) for more

than 2hr.

Low Temperature Alarm

Refrigerator: Cabinet temperature has
remained below 26°F (-3.3°C) for more

than 2hr.

Freezer: Cabinet temperature has
remained below -23°F (-30.6°C) for more

than 2hr.

Beeps for 10 sec., then silent for 50 sec.. To silence
the alarm, press and release the up button.

Appliance cycles 5 min. on, 5 min. off.

Beeps for 10 sec., then silent for 50 sec. To silence
the alarm, press and release the up button.

Appliance cycles on and off with cabinet thermistor.

Beeps for 10 sec., then silent for 50 sec. To silence

the alarm and clear "Hi" from the display, press and

release the up button. The alarm icon stays on.

Automatically resets when temperature returns to
normal.

Beeps for 10 sec., then silent for 50 sec. To silence

the alarm and clear "Lo" from the display, press and

release the up button. The alarm icon stays on.

Automatically resets when temperature returns to
normal.

39

E. Safety Devices

1. Compressor External or Internal Protector

If combined temperature/amperage value is above the limit specied by the compressor
manufacturer, the compressor external or internal protector operates independently to
turn off the compressor. The compressor external or internal protector de-energizes the
compressor until the temperature/amperage value returns to an acceptable level.

• If the condenser fan motor is operating and the compressor is off, it is most likely that

the compressor external or internal protector opened. If both the compressor and
condenser fan motor are off, it is most likely the appliance is off or the high-pressure

switch has opened. For further details, see "II.B. Service Diagnosis."

• On refrigerators, the compressor external protector is integrated with the start relay.

On 1-section freezers, the compressor protector is an internal protector. On 2-section
freezers, the compressor protector is an external protector.

2. Short-Cycle Protection

There is a 2-min. minimum off-time and on-time for the compressor.

Note: Time may vary with compressor protector or high-pressure switch activation.

3. High-Pressure Switch

If pressure on the high-side of the appliance exceeds Hoshizaki specications, the
high-pressure switch activates and interrupts the compressor circuit, de-energizing the
compressor until the pressure returns to an acceptable level.

F. Mullion/Perimeter Heater

Refrigerators and freezers with mullions are equipped with mullion heaters. Freezers are
also equipped with perimeter heaters. The heaters are energized as soon as the power
switch is turned on.

40

IV. Replacement of Components

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.

• Move the power switch to the "OFF" position, then unplug the appliance from the

electrical outlet before servicing.

• Make sure all food zones in the appliance are clean after the appliance is

serviced.

A. Service for Refrigerant Lines

WARNING

• Repairs requiring the refrigeration circuit to be opened must be performed by

properly trained and EPA-certied service personnel.

• Always recover the refrigerant and store it in an approved container. Do not

discharge the refrigerant into the atmosphere.

• 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-134a or R-404A as a
mixture with pressurized air for leak testing.

NOTICE

• Do not leave the system open for longer than 15 min. when replacing or servicing

parts. The Polyol Ester (POE) oils used in R-134a and R-404A appliances
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 appliance is provided with refrigerant access valves. Using proper refrigerant
practices recover the refrigerant from the access valves and store it in an approved
container. Do not discharge the refrigerant into the atmosphere.

41

2. Brazing

WARNING

• R-134a and R-404A themselves are not ammable at atmospheric pressure and

temperatures up to 176°F (80°C).

• R-134a and R-404A themselves are not explosive or poisonous. However,
when exposed to high temperatures (open ames), R-134a and 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.

• 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 (140PSIG). Do not use R-134a or R-404A as a
mixture with pressurized air for leak testing.

1) Braze all ttings while purging with nitrogen gas owing at a pressure of 3 to 4 PSIG.

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-134a or R-404A as a mixture
with pressurized air for leak testing.

3. Evacuation and Recharge

1) Attach a vacuum pump to the system. Be sure the charging hoses are connected to both
high and low-side 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.

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

42

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. See the nameplate for the required refrigerant charge. Hoshizaki recommends
only virgin refrigerant or reclaimed refrigerant which meets ARI Standard 700 (latest
edition) be used.

6) A liquid charge is required when charging an R-404A system (to prevent fractionation)
and optional when charging an R-134a system. 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
access valve with the appliance running.

9) Close gauge manifold valves and disconnect the hoses.

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

43

B. Important Notes for Component Replacement

NOTICE

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

operation.

• When replacing a control module or display module on an appliance with a control

module with remote display module, an HS conversion kit is required.
Refrigerator: HS-5079; Freezer: HS-5078

Component Notes

Compressor Install a new start relay, start capacitor, and compressor protector (compressor protector

is integrated with the start relay on refrigerators; internal on 1-section freezers; external on
2-section freezers).

Compressor,
Evaporator
Fan Motor,
Condenser Fan
Motor

Expansion Valve • Attach the expansion valve bulb to the suction line in the same location as the previous

Defrost
Thermistor

Control Module
w/Remote
Display

WARNING! To reduce the risk of electric shock, be sure to reconnect the
component's ground wire.

bulb.

• Secure the bulb with the clamp and holder, then insulate it.

After working with or around the defrost thermistor on a freezer, make sure the defrost
thermistor wire is not touching the defrost heater.

If three dashes (- - -) appear on the display module when energized, the compressor and
display module are off. To turn the compressor and display module on, press and hold the
upper and lower buttons until the temperature appears on the display. NOTICE! The three

dashes must be cleared, otherwise the compressor will not run and product will be
lost.

C. Door Reversal

The appliance is provided with a cabinet design which, after being delivered to the
installation location, permits changing of the door swing from left to right or right to left.
To change the door swing, an HS kit from your local Hoshizaki distributor is required. See
the table below. NOTICE! Improper installation of the HS kit may result in the doors
not closing completely and/or the gaskets not sealing correctly. For further details,
contact your local Hoshizaki distributor or Hoshizaki Technical Support at
1-800-233-1940.

Door Type Convert HS Kit Number

Full Glass

Full Solid, Half Solid

Right Hinge to Left Hinge HS-5045

Left Hinge to Right Hinge HS-5046

Right Hinge to Left Hinge HS-3725

Left Hinge to Right Hinge HS-3726

44

V. Maintenance

WARNING

• Move the power switch to the "OFF" position and unplug the appliance before

performing maintenance to prevent electric shock or injury by moving parts. To
reduce the risk of electric shock, do not touch the power switch or plug with damp
hands.

• Before performing maintenance, move all foods into another clean refrigerator or

freezer.

1. Condenser

Check the condenser once a year and use a brush or vacuum cleaner to clean the
condenser as required.

2. Power Supply Connection

If a plug, power cord, or receptacle (three-section models) is damaged, replace it. Be
sure to connect the ground wire.

45

VI. Preparing the Appliance for Periods of Non-Use

WARNING

• When preparing the appliance for long storage, prevent the doors from closing to

reduce the risk of children getting trapped.

• To reduce the risk of electric shock, do not touch the attachment plug or power

switch with damp hands.

• When shutting down the appliance for more than one week, move the power
switch to the "OFF" position and unplug the appliance.

• Do not plug in/unplug the appliance to start/stop operation. Make sure the power
switch is in the "OFF" position before plugging in or unplugging the appliance to

reduce the risk of electric shock.

1) Before shutting down the appliance, move the stored food into another refrigerator or
freezer.

2) Reach over the front panel and move the power switch to the "OFF" position. The

appliance will shut down.

3) Unplug the appliance.

IMPORTANT

When preparing the appliance for long storage, clean the cabinet interior, door
gaskets, and shelves.

46

VII. Disposal

WARNING

When preparing the appliance for disposal, remove the door to reduce the risk of
children getting trapped. Leave the shelves in place so that children may not easily
climb inside.

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.

47

VIII. Technical Information

A. Electrical and Refrigerant Data

Design Pressure

AC Supply

Model

CR1B-FG/FS/HS
CF1B-FG/FS/HS 9 450 250 - 8
CR2B-FG/FS/HS 7 240 120 12 ­CF2B-FG/FS/HS 11 450 250 - 17

CR3B-FS/HS 115/60/1 9 240 120

CF3B-FS/HS 208-230/115/60/1 16 450 250 -

Voltage Amperes

4 240 120 11 -

115/60/1

See the nameplate for electrical and refrigerant data. The nameplate is located inside the
cabinet.
We reserve the right to make changes in specications and design without prior notice.

(PSIG) Refrigerant (oz.)

HIGH LOW 134a 404A

1-Section

11

2-Section

12

-

1-Section

8

2-Section

17

48

B. Wiring Diagrams

1a. CR1B-FG Auxiliary Code A-5 to B-5(A)

Control Module with
Remote Display Module

*

* High-Pressure Switch

Cut-out 270±10 PSIG

Cut-in 190±20 PSIG

49

1b. CR1B-FG Auxiliary Code B-5(B) and Later

Control Module with
Integrated Display

*

* High-Pressure Switch

Cut-out 300±10 PSIG

Cut-in 190±20 PSIG

50

2a. CR1B-FS/HS, CR3B-FS/HS Auxiliary Code V-5 to B-5(A)

Control Module with
Remote Display Module

*

* High-Pressure Switch

Cut-out 270±10 PSIG

Cut-in 190±20 PSIG

51

2b. CR1B-FS/HS, CR3B-FS/HS Auxiliary Code B-5(B) and Later

Control Module with
Integrated Display

*

* High-Pressure Switch

Cut-out 300±10 PSIG

Cut-in 190±20 PSIG

52

3a. CR2B-FG Auxiliary Code A-5

Control Module with
Remote Display Module

*

* High-Pressure Switch

Cut-out 270±10 PSIG

Cut-in 190±20 PSIG

53

3b. CR2B-FG Auxiliary Code B-6 and Later

Control Module with
Integrated Display

*

* High-Pressure Switch

Cut-out 300±10 PSIG

Cut-in 190±20 PSIG

54

4a. CR2B-FS and CR3B-FS Auxiliary Code V-5 to B-5(B)

CR2B-HS Auxiliary Code A-5 to B-5(A),

CR3B-HS Auxiliary Code A-5 to B-5(C)

Control Module with
Remote Display Module

*

* High-Pressure Switch

Cut-out 270±10 PSIG

Cut-in 190±20 PSIG

55

4b. CR2B-FS and CR3B-FS Auxiliary Code B-5(C) and Later,

CR2B-HS Auxiliary Code A-5 to B-5(B) and Later,

CR3B-HS Auxiliary Code B-5(D) and Later

Control Module with
Integrated Display

*

* High-Pressure Switch

Cut-out 300±10 PSIG

Cut-in 190±20 PSIG

56

5a. CF1B-FG Auxiliary Code B-5(C) and Earlier

Control Module with
Remote Display Module

**

*

* High-Pressure Switch

Cut-out 490±10 PSIG

Cut-in 370±20 PSIG

** Defrost Thermostat

Cut-out

Cut-in

°F±5°F (49°C±3°C)

120

°F±5°F (21°C±3°C)

70

57

5b. CF1B-FG Auxiliary Code B-5(D) and Later

Control Module with
Integrated Display

**

*

* High-Pressure Switch

Cut-out 490±10 PSIG

Cut-in 370±20 PSIG

** Defrost Thermostat

Cut-out

Cut-in

°F±5°F (49°C±3°C)

120

°F±5°F (21°C±3°C)

70

58

6a. CF1B-FS and CF3B-FS (one section side) Auxiliary Code A-5 to B-5(B),

CF1B-HS Auxiliary Code A-5 to B-5(A),

CF3B-HS (one section side) Auxiliary Code B-6 and Later

Control Module with
Remote Display Module

A-5 (G)

**

and later

*

* High-Pressure Switch

Cut-out 490±10 PSIG

Cut-in 370±20 PSIG

** Defrost Thermostat

Cut-out

Cut-in

°F±5°F (49°C±3°C)

120

°F±5°F (21°C±3°C)

70

59

6b. CF1B-FS and CF3B-FS (one section side) Auxiliary Code A-5 to B-5(B),

CF1B-HS Auxiliary Code A-5 to B-5(A),

CF3B-HS (one section side) Auxiliary Code B-6 and Later

Control Module with
Integrated Display

**

*

* High-Pressure Switch

Cut-out 490±10 PSIG

Cut-in 370±20 PSIG

** Defrost Thermostat

Cut-out

Cut-in

°F±5°F (49°C±3°C)

120

°F±5°F (21°C±3°C)

70

60

7a. CF2B-FS and CF3B-FS (two section side) Auxiliary Code A-5 to B-5(A),

CF2B-HS Auxiliary Code A-5 to B-5

Control Module with
Remote Display Module

*

A-5 (G)
and later

**

* High-Pressure Switch

Cut-out 490±10 PSIG

Cut-in 370±20 PSIG

** Defrost Thermostat

Cut-out

Cut-in

°F±5°F (49°C±3°C)

120

°F±5°F (21°C±3°C)

70

61

7b. CF2B-FS and CF3B-FS (two section side) Auxiliary Code B-5(B) and Later,

CF2B-HS and CF3B-HS (two section side) Auxiliary Code B-6 and Later

Control Module with
Integrated Display

*

**

* High-Pressure Switch

Cut-out 490±10 PSIG

Cut-in 370±20 PSIG

** Defrost Thermostat

Cut-out

Cut-in

°F±5°F (49°C±3°C)

120

°F±5°F (21°C±3°C)

70

62

8. CR3B-FS/HS Receptacle Box Connection

Note: Only the top receptacles have power.

9. CF3B-FS/HS Receptacle Box Connection

Note: Only the top receptacles have power.

63