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.

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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

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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.

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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.

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